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OgreGpuProgram.h @ 17

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1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://www.ogre3d.org
6
7	Copyright (c) 2000-2006 Torus Knot Software Ltd
8	Also see acknowledgements in Readme.html
9
10	This program is free software; you can redistribute it and/or modify it under
11	the terms of the GNU Lesser General Public License as published by the Free Software
12	Foundation; either version 2 of the License, or (at your option) any later
13	version.
14
15	This program is distributed in the hope that it will be useful, but WITHOUT
16	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19	You should have received a copy of the GNU Lesser General Public License along with
20	this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21	Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22	http://www.gnu.org/copyleft/lesser.txt.
23
24	You may alternatively use this source under the terms of a specific version of
25	the OGRE Unrestricted License provided you have obtained such a license from
26	Torus Knot Software Ltd.
27	-----------------------------------------------------------------------------
28	*/
29	#ifndef __GpuProgram_H_
30	#define __GpuProgram_H_
31
32	// Precompiler options
33	#include "OgrePrerequisites.h"
34	#include "OgreResource.h"
35	#include "OgreSharedPtr.h"
36	#include "OgreIteratorWrappers.h"
37
38	namespace Ogre {
39
40	/** Enumerates the types of programs which can run on the GPU. */
41	enum GpuProgramType
42	{
43	GPT_VERTEX_PROGRAM,
44	GPT_FRAGMENT_PROGRAM
45	};
46
47	/** Enumeration of the types of constant we may encounter in programs.
48	@note Low-level programs, by definition, will always use either
49	float4 or int4 constant types since that is the fundamental underlying
50	type in assembler.
51	*/
52	enum GpuConstantType
53	{
54	GCT_FLOAT1,
55	GCT_FLOAT2,
56	GCT_FLOAT3,
57	GCT_FLOAT4,
58	GCT_SAMPLER1D,
59	GCT_SAMPLER2D,
60	GCT_SAMPLER3D,
61	GCT_SAMPLERCUBE,
62	GCT_SAMPLER1DSHADOW,
63	GCT_SAMPLER2DSHADOW,
64	GCT_MATRIX_2X2,
65	GCT_MATRIX_2X3,
66	GCT_MATRIX_2X4,
67	GCT_MATRIX_3X2,
68	GCT_MATRIX_3X3,
69	GCT_MATRIX_3X4,
70	GCT_MATRIX_4X2,
71	GCT_MATRIX_4X3,
72	GCT_MATRIX_4X4,
73	GCT_INT1,
74	GCT_INT2,
75	GCT_INT3,
76	GCT_INT4,
77	GCT_UNKNOWN
78	};
79
80	/** Information about predefined program constants.
81	@note Only available for high-level programs but is referenced generically
82	by GpuProgramParameters.
83	*/
84	struct _OgreExport GpuConstantDefinition
85	{
86	/// Data type
87	GpuConstantType constType;
88	/// Physical start index in buffer (either float or int buffer)
89	size_t physicalIndex;
90	/** Number of raw buffer slots per element
91	(some programs pack each array element to float4, some do not) */
92	size_t elementSize;
93	/// Length of array
94	size_t arraySize;
95
96	bool isFloat() const
97	{
98	switch(constType)
99	{
100	case GCT_INT1:
101	case GCT_INT2:
102	case GCT_INT3:
103	case GCT_INT4:
104	case GCT_SAMPLER1D:
105	case GCT_SAMPLER2D:
106	case GCT_SAMPLER3D:
107	case GCT_SAMPLERCUBE:
108	case GCT_SAMPLER1DSHADOW:
109	case GCT_SAMPLER2DSHADOW:
110	return false;
111	default:
112	return true;
113	};
114
115	}
116
117	bool isSampler() const
118	{
119	switch(constType)
120	{
121	case GCT_SAMPLER1D:
122	case GCT_SAMPLER2D:
123	case GCT_SAMPLER3D:
124	case GCT_SAMPLERCUBE:
125	case GCT_SAMPLER1DSHADOW:
126	case GCT_SAMPLER2DSHADOW:
127	return true;
128	default:
129	return false;
130	};
131
132	}
133
134	GpuConstantDefinition()
135	: constType(GCT_UNKNOWN)
136	, physicalIndex((std::numeric_limits<size_t>::max)())
137	, elementSize(0)
138	, arraySize(1) {}
139	};
140	typedef std::map<String, GpuConstantDefinition> GpuConstantDefinitionMap;
141	typedef ConstMapIterator<GpuConstantDefinitionMap> GpuConstantDefinitionIterator;
142
143	/// Struct collecting together the information for named constants.
144	struct _OgreExport GpuNamedConstants
145	{
146	/// Total size of the float buffer required
147	size_t floatBufferSize;
148	/// Total size of the int buffer required
149	size_t intBufferSize;
150	/// Map of parameter names to GpuConstantDefinition
151	GpuConstantDefinitionMap map;
152
153	/** Generate additional constant entries for arrays based on a base definition.
154	@remarks
155	Array uniforms will be added just with their base name with no array
156	suffix. This method will add named entries for array suffixes too
157	so individual array entries can be addressed. Note that we only
158	individually index array elements if the array size is up to 16
159	entries in size. Anything larger than that only gets a [0] entry
160	as well as the main entry, to save cluttering up the name map. After
161	all, you can address the larger arrays in a bulk fashion much more
162	easily anyway.
163	*/
164	void generateConstantDefinitionArrayEntries(const String& paramName,
165	const GpuConstantDefinition& baseDef);
166
167	};
168
169	/** Structure recording the use of a physical buffer by a logical parameter
170	index. Only used for low-level programs.
171	*/
172	struct _OgreExport GpuLogicalIndexUse
173	{
174	/// Physical buffer index
175	size_t physicalIndex;
176	/// Current physical size allocation
177	size_t currentSize;
178
179	GpuLogicalIndexUse(size_t bufIdx, size_t curSz)
180	: physicalIndex(bufIdx), currentSize(curSz) {}
181	};
182	typedef std::map<size_t, GpuLogicalIndexUse> GpuLogicalIndexUseMap;
183	/// Container struct to allow params to safely & update shared list of logical buffer assignments
184	struct _OgreExport GpuLogicalBufferStruct
185	{
186	OGRE_MUTEX(mutex)
187	/// Map from logical index to physical buffer location
188	GpuLogicalIndexUseMap map;
189	/// Shortcut to know the buffer size needs
190	size_t bufferSize;
191	GpuLogicalBufferStruct() : bufferSize(0) {}
192	};
193
194	/** Collects together the program parameters used for a GpuProgram.
195	@remarks
196	Gpu program state includes constant parameters used by the program, and
197	bindings to render system state which is propagated into the constants
198	by the engine automatically if requested.
199	@par
200	GpuProgramParameters objects should be created through the GpuProgram and
201	may be shared between multiple Pass instances. For this reason they
202	are managed using a shared pointer, which will ensure they are automatically
203	deleted when no Pass is using them anymore.
204	@par
205	High-level programs use named parameters (uniforms), low-level programs
206	use indexed constants. This class supports both, but you can tell whether
207	named constants are supported by calling hasNamedParameters(). There are
208	references in the documentation below to 'logical' and 'physical' indexes;
209	logical indexes are the indexes used by low-level programs and represent
210	indexes into an array of float4's, some of which may be settable, some of
211	which may be predefined constants in the program. We only store those
212	constants which have actually been set, therefore our buffer could have
213	gaps if we used the logical indexes in our own buffers. So instead we map
214	these logical indexes to physical indexes in our buffer. When using
215	high-level programs, logical indexes don't necessarily exist, although they
216	might if the high-level program has a direct, exposed mapping from parameter
217	names to logical indexes. In addition, high-level languages may or may not pack
218	arrays of elements that are smaller than float4 (e.g. float2/vec2) contiguously.
219	This kind of information is held in the ConstantDefinition structure which
220	is only populated for high-level programs. You don't have to worry about
221	any of this unless you intend to read parameters back from this structure
222	rather than just setting them.
223	*/
224	class _OgreExport GpuProgramParameters
225	{
226	public:
227	/** Defines the types of automatically updated values that may be bound to GpuProgram
228	parameters, or used to modify parameters on a per-object basis.
229	*/
230	enum AutoConstantType
231	{
232	/// The current world matrix
233	ACT_WORLD_MATRIX,
234	/// The current world matrix, inverted
235	ACT_INVERSE_WORLD_MATRIX,
236	/** Provides transpose of world matrix.
237	Equivalent to RenderMonkey's "WorldTranspose".
238	*/
239	ACT_TRANSPOSE_WORLD_MATRIX,
240	/// The current world matrix, inverted & transposed
241	ACT_INVERSE_TRANSPOSE_WORLD_MATRIX,
242
243
244	/// The current array of world matrices, as a 3x4 matrix, used for blending
245	ACT_WORLD_MATRIX_ARRAY_3x4,
246	/// The current array of world matrices, used for blending
247	ACT_WORLD_MATRIX_ARRAY,
248
249	/// The current view matrix
250	ACT_VIEW_MATRIX,
251	/// The current view matrix, inverted
252	ACT_INVERSE_VIEW_MATRIX,
253	/** Provides transpose of view matrix.
254	Equivalent to RenderMonkey's "ViewTranspose".
255	*/
256	ACT_TRANSPOSE_VIEW_MATRIX,
257	/** Provides inverse transpose of view matrix.
258	Equivalent to RenderMonkey's "ViewInverseTranspose".
259	*/
260	ACT_INVERSE_TRANSPOSE_VIEW_MATRIX,
261
262
263	/// The current projection matrix
264	ACT_PROJECTION_MATRIX,
265	/** Provides inverse of projection matrix.
266	Equivalent to RenderMonkey's "ProjectionInverse".
267	*/
268	ACT_INVERSE_PROJECTION_MATRIX,
269	/** Provides transpose of projection matrix.
270	Equivalent to RenderMonkey's "ProjectionTranspose".
271	*/
272	ACT_TRANSPOSE_PROJECTION_MATRIX,
273	/** Provides inverse transpose of projection matrix.
274	Equivalent to RenderMonkey's "ProjectionInverseTranspose".
275	*/
276	ACT_INVERSE_TRANSPOSE_PROJECTION_MATRIX,
277
278
279	/// The current view & projection matrices concatenated
280	ACT_VIEWPROJ_MATRIX,
281	/** Provides inverse of concatenated view and projection matrices.
282	Equivalent to RenderMonkey's "ViewProjectionInverse".
283	*/
284	ACT_INVERSE_VIEWPROJ_MATRIX,
285	/** Provides transpose of concatenated view and projection matrices.
286	Equivalent to RenderMonkey's "ViewProjectionTranspose".
287	*/
288	ACT_TRANSPOSE_VIEWPROJ_MATRIX,
289	/** Provides inverse transpose of concatenated view and projection matrices.
290	Equivalent to RenderMonkey's "ViewProjectionInverseTranspose".
291	*/
292	ACT_INVERSE_TRANSPOSE_VIEWPROJ_MATRIX,
293
294
295	/// The current world & view matrices concatenated
296	ACT_WORLDVIEW_MATRIX,
297	/// The current world & view matrices concatenated, then inverted
298	ACT_INVERSE_WORLDVIEW_MATRIX,
299	/** Provides transpose of concatenated world and view matrices.
300	Equivalent to RenderMonkey's "WorldViewTranspose".
301	*/
302	ACT_TRANSPOSE_WORLDVIEW_MATRIX,
303	/// The current world & view matrices concatenated, then inverted & tranposed
304	ACT_INVERSE_TRANSPOSE_WORLDVIEW_MATRIX,
305	/// view matrices.
306
307
308	/// The current world, view & projection matrices concatenated
309	ACT_WORLDVIEWPROJ_MATRIX,
310	/** Provides inverse of concatenated world, view and projection matrices.
311	Equivalent to RenderMonkey's "WorldViewProjectionInverse".
312	*/
313	ACT_INVERSE_WORLDVIEWPROJ_MATRIX,
314	/** Provides transpose of concatenated world, view and projection matrices.
315	Equivalent to RenderMonkey's "WorldViewProjectionTranspose".
316	*/
317	ACT_TRANSPOSE_WORLDVIEWPROJ_MATRIX,
318	/** Provides inverse transpose of concatenated world, view and projection
319	matrices. Equivalent to RenderMonkey's "WorldViewProjectionInverseTranspose".
320	*/
321	ACT_INVERSE_TRANSPOSE_WORLDVIEWPROJ_MATRIX,
322
323
324	/// render target related values
325	/** -1 if requires texture flipping, +1 otherwise. It's useful when you bypassed
326	projection matrix transform, still able use this value to adjust transformed y position.
327	*/
328	ACT_RENDER_TARGET_FLIPPING,
329
330
331	/// Fog colour
332	ACT_FOG_COLOUR,
333	/// Fog params: density, linear start, linear end, 1/(end-start)
334	ACT_FOG_PARAMS,
335
336
337	/// Surface ambient colour, as set in Pass::setAmbient
338	ACT_SURFACE_AMBIENT_COLOUR,
339	/// Surface diffuse colour, as set in Pass::setDiffuse
340	ACT_SURFACE_DIFFUSE_COLOUR,
341	/// Surface specular colour, as set in Pass::setSpecular
342	ACT_SURFACE_SPECULAR_COLOUR,
343	/// Surface emissive colour, as set in Pass::setSelfIllumination
344	ACT_SURFACE_EMISSIVE_COLOUR,
345	/// Surface shininess, as set in Pass::setShininess
346	ACT_SURFACE_SHININESS,
347
348
349	/// The ambient light colour set in the scene
350	ACT_AMBIENT_LIGHT_COLOUR,
351
352	/// Light diffuse colour (index determined by setAutoConstant call)
353	ACT_LIGHT_DIFFUSE_COLOUR,
354	/// Light specular colour (index determined by setAutoConstant call)
355	ACT_LIGHT_SPECULAR_COLOUR,
356	/// Light attenuation parameters, Vector4(range, constant, linear, quadric)
357	ACT_LIGHT_ATTENUATION,
358	/** Spotlight parameters, Vector4(innerFactor, outerFactor, falloff, isSpot)
359	innerFactor and outerFactor are cos(angle/2)
360	The isSpot parameter is 0.0f for non-spotlights, 1.0f for spotlights.
361	Also for non-spotlights the inner and outer factors are 1 and nearly 1 respectively
362	*/
363	ACT_SPOTLIGHT_PARAMS,
364	/// A light position in world space (index determined by setAutoConstant call)
365	ACT_LIGHT_POSITION,
366	/// A light position in object space (index determined by setAutoConstant call)
367	ACT_LIGHT_POSITION_OBJECT_SPACE,
368	/// A light position in view space (index determined by setAutoConstant call)
369	ACT_LIGHT_POSITION_VIEW_SPACE,
370	/// A light direction in world space (index determined by setAutoConstant call)
371	ACT_LIGHT_DIRECTION,
372	/// A light direction in object space (index determined by setAutoConstant call)
373	ACT_LIGHT_DIRECTION_OBJECT_SPACE,
374	/// A light direction in view space (index determined by setAutoConstant call)
375	ACT_LIGHT_DIRECTION_VIEW_SPACE,
376	/** The distance of the light from the center of the object
377	a useful approximation as an alternative to per-vertex distance
378	calculations.
379	*/
380	ACT_LIGHT_DISTANCE_OBJECT_SPACE,
381	/** Light power level, a single scalar as set in Light::setPowerScale (index determined by setAutoConstant call) */
382	ACT_LIGHT_POWER_SCALE,
383	/// Array of light diffuse colours (count set by extra param)
384	ACT_LIGHT_DIFFUSE_COLOUR_ARRAY,
385	/// Array of light specular colours (count set by extra param)
386	ACT_LIGHT_SPECULAR_COLOUR_ARRAY,
387	/// Array of light attenuation parameters, Vector4(range, constant, linear, quadric) (count set by extra param)
388	ACT_LIGHT_ATTENUATION_ARRAY,
389	/// Array of light positions in world space (count set by extra param)
390	ACT_LIGHT_POSITION_ARRAY,
391	/// Array of light positions in object space (count set by extra param)
392	ACT_LIGHT_POSITION_OBJECT_SPACE_ARRAY,
393	/// Array of light positions in view space (count set by extra param)
394	ACT_LIGHT_POSITION_VIEW_SPACE_ARRAY,
395	/// Array of light directions in world space (count set by extra param)
396	ACT_LIGHT_DIRECTION_ARRAY,
397	/// Array of light directions in object space (count set by extra param)
398	ACT_LIGHT_DIRECTION_OBJECT_SPACE_ARRAY,
399	/// Array of light directions in view space (count set by extra param)
400	ACT_LIGHT_DIRECTION_VIEW_SPACE_ARRAY,
401	/** Array of distances of the lights from the center of the object
402	a useful approximation as an alternative to per-vertex distance
403	calculations. (count set by extra param)
404	*/
405	ACT_LIGHT_DISTANCE_OBJECT_SPACE_ARRAY,
406	/** Array of light power levels, a single scalar as set in Light::setPowerScale
407	(count set by extra param)
408	*/
409	ACT_LIGHT_POWER_SCALE_ARRAY,
410	/** Spotlight parameters array of Vector4(innerFactor, outerFactor, falloff, isSpot)
411	innerFactor and outerFactor are cos(angle/2)
412	The isSpot parameter is 0.0f for non-spotlights, 1.0f for spotlights.
413	Also for non-spotlights the inner and outer factors are 1 and nearly 1 respectively.
414	(count set by extra param)
415	*/
416	ACT_SPOTLIGHT_PARAMS_ARRAY,
417
418	/** The derived ambient light colour, with 'r', 'g', 'b' components filled with
419	product of surface ambient colour and ambient light colour, respectively,
420	and 'a' component filled with surface ambient alpha component.
421	*/
422	ACT_DERIVED_AMBIENT_LIGHT_COLOUR,
423	/** The derived scene colour, with 'r', 'g' and 'b' components filled with sum
424	of derived ambient light colour and surface emissive colour, respectively,
425	and 'a' component filled with surface diffuse alpha component.
426	*/
427	ACT_DERIVED_SCENE_COLOUR,
428
429	/** The derived light diffuse colour (index determined by setAutoConstant call),
430	with 'r', 'g' and 'b' components filled with product of surface diffuse colour
431	and light diffuse colour, respectively, and 'a' component filled with surface
432	diffuse alpha component.
433	*/
434	ACT_DERIVED_LIGHT_DIFFUSE_COLOUR,
435	/** The derived light specular colour (index determined by setAutoConstant call),
436	with 'r', 'g' and 'b' components filled with product of surface specular colour
437	and light specular colour, respectively, and 'a' component filled with surface
438	specular alpha component.
439	*/
440	ACT_DERIVED_LIGHT_SPECULAR_COLOUR,
441
442	/// Array of derived light diffuse colours (count set by extra param)
443	ACT_DERIVED_LIGHT_DIFFUSE_COLOUR_ARRAY,
444	/// Array of derived light specular colours (count set by extra param)
445	ACT_DERIVED_LIGHT_SPECULAR_COLOUR_ARRAY,
446
447
448	/** The distance a shadow volume should be extruded when using
449	finite extrusion programs.
450	*/
451	ACT_SHADOW_EXTRUSION_DISTANCE,
452	/// The current camera's position in world space
453	ACT_CAMERA_POSITION,
454	/// The current camera's position in object space
455	ACT_CAMERA_POSITION_OBJECT_SPACE,
456	/// The view/projection matrix of the assigned texture projection frustum
457	ACT_TEXTURE_VIEWPROJ_MATRIX,
458	/// A custom parameter which will come from the renderable, using 'data' as the identifier
459	ACT_CUSTOM,
460	/** provides current elapsed time
461	*/
462	ACT_TIME,
463	/** Single float value, which repeats itself based on given as
464	parameter "cycle time". Equivalent to RenderMonkey's "Time0_X".
465	*/
466	ACT_TIME_0_X,
467	/// Cosine of "Time0_X". Equivalent to RenderMonkey's "CosTime0_X".
468	ACT_COSTIME_0_X,
469	/// Sine of "Time0_X". Equivalent to RenderMonkey's "SinTime0_X".
470	ACT_SINTIME_0_X,
471	/// Tangent of "Time0_X". Equivalent to RenderMonkey's "TanTime0_X".
472	ACT_TANTIME_0_X,
473	/** Vector of "Time0_X", "SinTime0_X", "CosTime0_X",
474	"TanTime0_X". Equivalent to RenderMonkey's "Time0_X_Packed".
475	*/
476	ACT_TIME_0_X_PACKED,
477	/** Single float value, which represents scaled time value [0..1],
478	which repeats itself based on given as parameter "cycle time".
479	Equivalent to RenderMonkey's "Time0_1".
480	*/
481	ACT_TIME_0_1,
482	/// Cosine of "Time0_1". Equivalent to RenderMonkey's "CosTime0_1".
483	ACT_COSTIME_0_1,
484	/// Sine of "Time0_1". Equivalent to RenderMonkey's "SinTime0_1".
485	ACT_SINTIME_0_1,
486	/// Tangent of "Time0_1". Equivalent to RenderMonkey's "TanTime0_1".
487	ACT_TANTIME_0_1,
488	/** Vector of "Time0_1", "SinTime0_1", "CosTime0_1",
489	"TanTime0_1". Equivalent to RenderMonkey's "Time0_1_Packed".
490	*/
491	ACT_TIME_0_1_PACKED,
492	/** Single float value, which represents scaled time value [0..2*Pi],
493	which repeats itself based on given as parameter "cycle time".
494	Equivalent to RenderMonkey's "Time0_2PI".
495	*/
496	ACT_TIME_0_2PI,
497	/// Cosine of "Time0_2PI". Equivalent to RenderMonkey's "CosTime0_2PI".
498	ACT_COSTIME_0_2PI,
499	/// Sine of "Time0_2PI". Equivalent to RenderMonkey's "SinTime0_2PI".
500	ACT_SINTIME_0_2PI,
501	/// Tangent of "Time0_2PI". Equivalent to RenderMonkey's "TanTime0_2PI".
502	ACT_TANTIME_0_2PI,
503	/** Vector of "Time0_2PI", "SinTime0_2PI", "CosTime0_2PI",
504	"TanTime0_2PI". Equivalent to RenderMonkey's "Time0_2PI_Packed".
505	*/
506	ACT_TIME_0_2PI_PACKED,
507	/// provides the scaled frame time, returned as a floating point value.
508	ACT_FRAME_TIME,
509	/// provides the calculated frames per second, returned as a floating point value.
510	ACT_FPS,
511	/// viewport-related values
512	/** Current viewport width (in pixels) as floating point value.
513	Equivalent to RenderMonkey's "ViewportWidth".
514	*/
515	ACT_VIEWPORT_WIDTH,
516	/** Current viewport height (in pixels) as floating point value.
517	Equivalent to RenderMonkey's "ViewportHeight".
518	*/
519	ACT_VIEWPORT_HEIGHT,
520	/** This variable represents 1.0/ViewportWidth.
521	Equivalent to RenderMonkey's "ViewportWidthInverse".
522	*/
523	ACT_INVERSE_VIEWPORT_WIDTH,
524	/** This variable represents 1.0/ViewportHeight.
525	Equivalent to RenderMonkey's "ViewportHeightInverse".
526	*/
527	ACT_INVERSE_VIEWPORT_HEIGHT,
528	/** Packed of "ViewportWidth", "ViewportHeight", "ViewportWidthInverse",
529	"ViewportHeightInverse".
530	*/
531	ACT_VIEWPORT_SIZE,
532
533	/// view parameters
534	/** This variable provides the view direction vector (world space).
535	Equivalent to RenderMonkey's "ViewDirection".
536	*/
537	ACT_VIEW_DIRECTION,
538	/** This variable provides the view side vector (world space).
539	Equivalent to RenderMonkey's "ViewSideVector".
540	*/
541	ACT_VIEW_SIDE_VECTOR,
542	/** This variable provides the view up vector (world space).
543	Equivalent to RenderMonkey's "ViewUpVector".
544	*/
545	ACT_VIEW_UP_VECTOR,
546	/** This variable provides the field of view as a floating point value.
547	Equivalent to RenderMonkey's "FOV".
548	*/
549	ACT_FOV,
550	/** This variable provides the near clip distance as a floating point value.
551	Equivalent to RenderMonkey's "NearClipPlane".
552	*/
553	ACT_NEAR_CLIP_DISTANCE,
554	/** This variable provides the far clip distance as a floating point value.
555	Equivalent to RenderMonkey's "FarClipPlane".
556	*/
557	ACT_FAR_CLIP_DISTANCE,
558
559	/** provides the pass index number within the technique
560	of the active materil.
561	*/
562	ACT_PASS_NUMBER,
563
564	/** provides the current iteration number of the pass. The iteration
565	number is the number of times the current render operation has
566	been drawn for the acitve pass.
567	*/
568	ACT_PASS_ITERATION_NUMBER,
569
570
571	/** Provides a parametric animation value [0..1], only available
572	where the renderable specifically implements it.
573	*/
574	ACT_ANIMATION_PARAMETRIC,
575
576	/** Provides the texel offsets required by this rendersystem to map
577	texels to pixels. Packed as
578	float4(absoluteHorizontalOffset, absoluteVerticalOffset,
579	horizontalOffset / viewportWidth, verticalOffset / viewportHeight)
580	*/
581	ACT_TEXEL_OFFSETS,
582
583	/** Provides information about the depth range of the scene as viewed
584	from the current camera.
585	Passed as float4(minDepth, maxDepth, depthRange, 1 / depthRange)
586	*/
587	ACT_SCENE_DEPTH_RANGE,
588
589	/** Provides information about the depth range of the scene as viewed
590	from a given shadow camera. Requires an index parameter which maps
591	to a light index relative to the current light list.
592	Passed as float4(minDepth, maxDepth, depthRange, 1 / depthRange)
593	*/
594	ACT_SHADOW_SCENE_DEPTH_RANGE,
595
596	/** Provides texture size of the texture unit (index determined by setAutoConstant
597	call). Packed as float4(width, height, depth, 1)
598	*/
599	ACT_TEXTURE_SIZE,
600	/** Provides inverse texture size of the texture unit (index determined by setAutoConstant
601	call). Packed as float4(1 / width, 1 / height, 1 / depth, 1)
602	*/
603	ACT_INVERSE_TEXTURE_SIZE,
604	/** Provides packed texture size of the texture unit (index determined by setAutoConstant
605	call). Packed as float4(width, height, 1 / width, 1 / height)
606	*/
607	ACT_PACKED_TEXTURE_SIZE,
608
609
610	};
611
612	/** Defines the type of the extra data item used by the auto constant.
613
614	*/
615	enum ACDataType {
616	/// no data is required
617	ACDT_NONE,
618	/// the auto constant requires data of type int
619	ACDT_INT,
620	/// the auto constant requires data of type real
621	ACDT_REAL
622	};
623
624	/** Defines the base element type of the auto constant
625	*/
626	enum ElementType {
627	ET_INT,
628	ET_REAL
629	};
630
631	/** Structure defining an auto constant that's available for use in
632	a parameters object.
633	*/
634	struct AutoConstantDefinition
635	{
636	AutoConstantType acType;
637	String name;
638	size_t elementCount;
639	/// The type of the constant in the program
640	ElementType elementType;
641	/// The type of any extra data
642	ACDataType dataType;
643
644	AutoConstantDefinition(AutoConstantType _acType, const String& _name,
645	size_t _elementCount, ElementType _elementType,
646	ACDataType _dataType)
647	:acType(_acType), name(_name), elementCount(_elementCount),
648	elementType(_elementType), dataType(_dataType)
649	{
650
651	}
652	};
653
654	/** Structure recording the use of an automatic parameter. */
655	class AutoConstantEntry
656	{
657	public:
658	/// The type of parameter
659	AutoConstantType paramType;
660	/// The target (physical) constant index
661	size_t physicalIndex;
662	/** The number of elements per individual entry in this constant
663	Used in case people used packed elements smaller than 4 (e.g. GLSL)
664	and bind an auto which is 4-element packed to it */
665	size_t elementCount;
666	/// Additional information to go with the parameter
667	union{
668	size_t data;
669	Real fData;
670	};
671
672	AutoConstantEntry(AutoConstantType theType, size_t theIndex, size_t theData,
673	size_t theElemCount = 4)
674	: paramType(theType), physicalIndex(theIndex), elementCount(theElemCount), data(theData) {}
675
676	AutoConstantEntry(AutoConstantType theType, size_t theIndex, Real theData,
677	size_t theElemCount = 4)
678	: paramType(theType), physicalIndex(theIndex), elementCount(theElemCount), fData(theData) {}
679
680	};
681	// Auto parameter storage
682	typedef std::vector<AutoConstantEntry> AutoConstantList;
683
684	/** Definition of container that holds the current float constants.
685	@note Not necessarily in direct index order to constant indexes, logical
686	to physical index map is derived from GpuProgram
687	*/
688	typedef std::vector<float> FloatConstantList;
689	/** Definition of container that holds the current float constants.
690	@note Not necessarily in direct index order to constant indexes, logical
691	to physical index map is derived from GpuProgram
692	*/
693	typedef std::vector<int> IntConstantList;
694
695	protected:
696	static AutoConstantDefinition AutoConstantDictionary[];
697	/// Packed list of floating-point constants (physical indexing)
698	FloatConstantList mFloatConstants;
699	/// Packed list of integer constants (physical indexing)
700	IntConstantList mIntConstants;
701	/** Logical index to physical index map - for low-level programs
702	or high-level programs which pass params this way. */
703	GpuLogicalBufferStruct* mFloatLogicalToPhysical;
704	/** Logical index to physical index map - for low-level programs
705	or high-level programs which pass params this way. */
706	GpuLogicalBufferStruct* mIntLogicalToPhysical;
707	/// Mapping from parameter names to def - high-level programs are expected to populate this
708	const GpuNamedConstants* mNamedConstants;
709	/// List of automatically updated parameters
710	AutoConstantList mAutoConstants;
711	/// Do we need to transpose matrices?
712	bool mTransposeMatrices;
713	/// flag to indicate if names not found will be ignored
714	bool mIgnoreMissingParams;
715	/// physical index for active pass iteration parameter real constant entry;
716	size_t mActivePassIterationIndex;
717
718	public:
719	GpuProgramParameters();
720	~GpuProgramParameters() {}
721
722	/// Copy constructor
723	GpuProgramParameters(const GpuProgramParameters& oth);
724	/// Operator = overload
725	GpuProgramParameters& operator=(const GpuProgramParameters& oth);
726
727	/** Internal method for providing a link to a name->definition map for parameters. */
728	void _setNamedConstants(const GpuNamedConstants* constantmap);
729
730	/** Internal method for providing a link to a logical index->physical index map for parameters. */
731	void _setLogicalIndexes(GpuLogicalBufferStruct* floatIndexMap,
732	GpuLogicalBufferStruct* intIndexMap);
733
734
735	/// Does this parameter set include named parameters?
736	bool hasNamedParameters() const { return mNamedConstants != 0;}
737	/** Does this parameter set include logically indexed parameters?
738	@note Not mutually exclusive with hasNamedParameters since some high-level
739	programs still use logical indexes to set the parameters on the
740	rendersystem.
741	*/
742	bool hasLogicalIndexedParameters() const { return mFloatLogicalToPhysical != 0;}
743
744	/** Sets a 4-element floating-point parameter to the program.
745	@param index The logical constant index at which to place the parameter
746	(each constant is a 4D float)
747	@param vec The value to set
748	*/
749	void setConstant(size_t index, const Vector4& vec);
750	/** Sets a single floating-point parameter to the program.
751	@note This is actually equivalent to calling
752	setConstant(index Vector4(val, 0, 0, 0)) since all constants are 4D.
753	@param index The logical constant index at which to place the parameter (each constant is
754	a 4D float)
755	@param val The value to set
756	*/
757	void setConstant(size_t index, Real val);
758	/** Sets a 4-element floating-point parameter to the program via Vector3.
759	@param index The logical constant index at which to place the parameter (each constant is
760	a 4D float).
761	Note that since you're passing a Vector3, the last element of the 4-element
762	value will be set to 1 (a homogenous vector)
763	@param vec The value to set
764	*/
765	void setConstant(size_t index, const Vector3& vec);
766	/** Sets a Matrix4 parameter to the program.
767	@param index The logical constant index at which to place the parameter (each constant is
768	a 4D float).
769	NB since a Matrix4 is 16 floats long, this parameter will take up 4 indexes.
770	@param m The value to set
771	*/
772	void setConstant(size_t index, const Matrix4& m);
773	/** Sets a list of Matrix4 parameters to the program.
774	@param index The logical constant index at which to start placing the parameter (each constant is
775	a 4D float).
776	NB since a Matrix4 is 16 floats long, so each entry will take up 4 indexes.
777	@param m Pointer to an array of matrices to set
778	@param numEntries Number of Matrix4 entries
779	*/
780	void setConstant(size_t index, const Matrix4* m, size_t numEntries);
781	/** Sets a multiple value constant floating-point parameter to the program.
782	@param index The logical constant index at which to start placing parameters (each constant is
783	a 4D float)
784	@param val Pointer to the values to write, must contain 4*count floats
785	@param count The number of groups of 4 floats to write
786	*/
787	void setConstant(size_t index, const float *val, size_t count);
788	/** Sets a multiple value constant floating-point parameter to the program.
789	@param index The logical constant index at which to start placing parameters (each constant is
790	a 4D float)
791	@param val Pointer to the values to write, must contain 4*count floats
792	@param count The number of groups of 4 floats to write
793	*/
794	void setConstant(size_t index, const double *val, size_t count);
795	/** Sets a ColourValue parameter to the program.
796	@param index The logical constant index at which to place the parameter (each constant is
797	a 4D float)
798	@param colour The value to set
799	*/
800	void setConstant(size_t index, const ColourValue& colour);
801
802	/** Sets a multiple value constant integer parameter to the program.
803	@remarks
804	Different types of GPU programs support different types of constant parameters.
805	For example, it's relatively common to find that vertex programs only support
806	floating point constants, and that fragment programs only support integer (fixed point)
807	parameters. This can vary depending on the program version supported by the
808	graphics card being used. You should consult the documentation for the type of
809	low level program you are using, or alternatively use the methods
810	provided on RenderSystemCapabilities to determine the options.
811	@param index The logical constant index at which to place the parameter (each constant is
812	a 4D integer)
813	@param val Pointer to the values to write, must contain 4*count ints
814	@param count The number of groups of 4 ints to write
815	*/
816	void setConstant(size_t index, const int *val, size_t count);
817
818	/** Write a series of floating point values into the underlying float
819	constant buffer at the given physical index.
820	@param physicalIndex The buffer position to start writing
821	@param val Pointer to a list of values to write
822	@param count The number of floats to write
823	*/
824	void _writeRawConstants(size_t physicalIndex, const float* val, size_t count);
825	/** Write a series of floating point values into the underlying float
826	constant buffer at the given physical index.
827	@param physicalIndex The buffer position to start writing
828	@param val Pointer to a list of values to write
829	@param count The number of floats to write
830	*/
831	void _writeRawConstants(size_t physicalIndex, const double* val, size_t count);
832	/** Write a series of integer values into the underlying integer
833	constant buffer at the given physical index.
834	@param physicalIndex The buffer position to start writing
835	@param val Pointer to a list of values to write
836	@param count The number of ints to write
837	*/
838	void _writeRawConstants(size_t physicalIndex, const int* val, size_t count);
839	/** Read a series of floating point values from the underlying float
840	constant buffer at the given physical index.
841	@param physicalIndex The buffer position to start reading
842	@param count The number of floats to read
843	@param dest Pointer to a buffer to receive the values
844	*/
845	void _readRawConstants(size_t physicalIndex, size_t count, float* dest);
846	/** Read a series of integer values from the underlying integer
847	constant buffer at the given physical index.
848	@param physicalIndex The buffer position to start reading
849	@param count The number of ints to read
850	@param dest Pointer to a buffer to receive the values
851	*/
852	void _readRawConstants(size_t physicalIndex, size_t count, int* dest);
853
854	/** Write a 4-element floating-point parameter to the program directly to
855	the underlying constants buffer.
856	@note You can use these methods if you have already derived the physical
857	constant buffer location, for a slight speed improvement over using
858	the named / logical index versions.
859	@param physicalIndex The physical buffer index at which to place the parameter
860	@param vec The value to set
861	@param count The number of floats to write; if for example
862	the uniform constant 'slot' is smaller than a Vector4
863	*/
864	void _writeRawConstant(size_t physicalIndex, const Vector4& vec,
865	size_t count = 4);
866	/** Write a single floating-point parameter to the program.
867	@note You can use these methods if you have already derived the physical
868	constant buffer location, for a slight speed improvement over using
869	the named / logical index versions.
870	@param physicalIndex The physical buffer index at which to place the parameter
871	@param val The value to set
872	*/
873	void _writeRawConstant(size_t physicalIndex, Real val);
874	/** Write a single integer parameter to the program.
875	@note You can use these methods if you have already derived the physical
876	constant buffer location, for a slight speed improvement over using
877	the named / logical index versions.
878	@param physicalIndex The physical buffer index at which to place the parameter
879	@param val The value to set
880	*/
881	void _writeRawConstant(size_t physicalIndex, int val);
882	/** Write a 3-element floating-point parameter to the program via Vector3.
883	@note You can use these methods if you have already derived the physical
884	constant buffer location, for a slight speed improvement over using
885	the named / logical index versions.
886	@param physicalIndex The physical buffer index at which to place the parameter
887	@param vec The value to set
888	*/
889	void _writeRawConstant(size_t physicalIndex, const Vector3& vec);
890	/** Write a Matrix4 parameter to the program.
891	@note You can use these methods if you have already derived the physical
892	constant buffer location, for a slight speed improvement over using
893	the named / logical index versions.
894	@param physicalIndex The physical buffer index at which to place the parameter
895	@param m The value to set
896	*/
897	void _writeRawConstant(size_t physicalIndex, const Matrix4& m);
898	/** Write a list of Matrix4 parameters to the program.
899	@note You can use these methods if you have already derived the physical
900	constant buffer location, for a slight speed improvement over using
901	the named / logical index versions.
902	@param physicalIndex The physical buffer index at which to place the parameter
903	@param numEntries Number of Matrix4 entries
904	*/
905	void _writeRawConstant(size_t physicalIndex, const Matrix4* m, size_t numEntries);
906	/** Write a ColourValue parameter to the program.
907	@note You can use these methods if you have already derived the physical
908	constant buffer location, for a slight speed improvement over using
909	the named / logical index versions.
910	@param physicalIndex The physical buffer index at which to place the parameter
911	@param colour The value to set
912	@param count The number of floats to write; if for example
913	the uniform constant 'slot' is smaller than a Vector4
914	*/
915	void _writeRawConstant(size_t physicalIndex, const ColourValue& colour,
916	size_t count = 4);
917
918
919	/** Gets an iterator over the named GpuConstantDefinition instances as defined
920	by the program for which these parameters exist.
921	@note
922	Only available if this parameters object has named parameters.
923	*/
924	GpuConstantDefinitionIterator getConstantDefinitionIterator(void) const;
925
926	/** Get a specific GpuConstantDefinition for a named parameter.
927	@note
928	Only available if this parameters object has named parameters.
929	*/
930	const GpuConstantDefinition& getConstantDefinition(const String& name) const;
931
932	/** Get the full list of GpuConstantDefinition instances.
933	@note
934	Only available if this parameters object has named parameters.
935	*/
936	const GpuNamedConstants& getConstantDefinitions() const;
937
938	/** Get the current list of mappings from low-level logical param indexes
939	to physical buffer locations in the float buffer.
940	@note
941	Only applicable to low-level programs.
942	*/
943	const GpuLogicalBufferStruct* getFloatLogicalBufferStruct() const { return mFloatLogicalToPhysical; }
944
945	/** Retrieves the logical index relating to a physical index in the float
946	buffer, for programs which support that (low-level programs and
947	high-level programs which use logical parameter indexes).
948	@returns std::numeric_limits<size_t>::max() if not found
949	*/
950	size_t getFloatLogicalIndexForPhysicalIndex(size_t physicalIndex);
951	/** Retrieves the logical index relating to a physical index in the int
952	buffer, for programs which support that (low-level programs and
953	high-level programs which use logical parameter indexes).
954	@returns std::numeric_limits<size_t>::max() if not found
955	*/
956	size_t getIntLogicalIndexForPhysicalIndex(size_t physicalIndex);
957
958	/** Get the current list of mappings from low-level logical param indexes
959	to physical buffer locations in the integer buffer.
960	@note
961	Only applicable to low-level programs.
962	*/
963	const GpuLogicalBufferStruct* getIntLogicalBufferStruct() const { return mIntLogicalToPhysical; }
964	/// Get a reference to the list of float constants
965	const FloatConstantList& getFloatConstantList() const { return mFloatConstants; }
966	/// Get a pointer to the 'nth' item in the float buffer
967	float* getFloatPointer(size_t pos) { return &mFloatConstants[pos]; }
968	/// Get a pointer to the 'nth' item in the float buffer
969	const float* getFloatPointer(size_t pos) const { return &mFloatConstants[pos]; }
970	/// Get a reference to the list of int constants
971	const IntConstantList& getIntConstantList() const { return mIntConstants; }
972	/// Get a pointer to the 'nth' item in the int buffer
973	int* getIntPointer(size_t pos) { return &mIntConstants[pos]; }
974	/// Get a pointer to the 'nth' item in the int buffer
975	const int* getIntPointer(size_t pos) const { return &mIntConstants[pos]; }
976	/// Get a reference to the list of auto constant bindings
977	const AutoConstantList& getAutoConstantList() const { return mAutoConstants; }
978
979	/** Sets up a constant which will automatically be updated by the system.
980	@remarks
981	Vertex and fragment programs often need parameters which are to do with the
982	current render state, or particular values which may very well change over time,
983	and often between objects which are being rendered. This feature allows you
984	to set up a certain number of predefined parameter mappings that are kept up to
985	date for you.
986	@param index The location in the constant list to place this updated constant every time
987	it is changed. Note that because of the nature of the types, we know how big the
988	parameter details will be so you don't need to set that like you do for manual constants.
989	@param acType The type of automatic constant to set
990	@param extraInfo If the constant type needs more information (like a light index) put it here.
991	*/
992	void setAutoConstant(size_t index, AutoConstantType acType, size_t extraInfo = 0);
993	void setAutoConstantReal(size_t index, AutoConstantType acType, Real rData);
994
995	/** As setAutoConstant, but sets up the auto constant directly against a
996	physical buffer index.
997	*/
998	void _setRawAutoConstant(size_t physicalIndex, AutoConstantType acType, size_t extraInfo,
999	size_t elementSize = 4);
1000	/** As setAutoConstantReal, but sets up the auto constant directly against a
1001	physical buffer index.
1002	*/
1003	void _setRawAutoConstantReal(size_t physicalIndex, AutoConstantType acType, Real rData,
1004	size_t elementSize = 4);
1005
1006
1007	/** Unbind an auto constant so that the constant is manually controlled again. */
1008	void clearAutoConstant(size_t index);
1009
1010	/** Sets a named parameter up to track a derivation of the current time.
1011	@param index The index of the parameter
1012	@param factor The amount by which to scale the time value
1013	*/
1014	void setConstantFromTime(size_t index, Real factor);
1015
1016	/** Clears all the existing automatic constants. */
1017	void clearAutoConstants(void);
1018	typedef ConstVectorIterator<AutoConstantList> AutoConstantIterator;
1019	/** Gets an iterator over the automatic constant bindings currently in place. */
1020	AutoConstantIterator getAutoConstantIterator(void) const;
1021	/// Gets the number of int constants that have been set
1022	size_t getAutoConstantCount(void) const { return mAutoConstants.size(); }
1023	/** Gets a specific Auto Constant entry if index is in valid range
1024	otherwise returns a NULL
1025	@parem index which entry is to be retrieved
1026	*/
1027	AutoConstantEntry* getAutoConstantEntry(const size_t index);
1028	/** Returns true if this instance has any automatic constants. */
1029	bool hasAutoConstants(void) const { return !(mAutoConstants.empty()); }
1030	/** Finds an auto constant that's affecting a given logical parameter
1031	index for floating-point values.
1032	@note Only applicable for low-level programs.
1033	*/
1034	const AutoConstantEntry* findFloatAutoConstantEntry(size_t logicalIndex);
1035	/** Finds an auto constant that's affecting a given logical parameter
1036	index for integer values.
1037	@note Only applicable for low-level programs.
1038	*/
1039	const AutoConstantEntry* findIntAutoConstantEntry(size_t logicalIndex);
1040	/** Finds an auto constant that's affecting a given named parameter index.
1041	@note Only applicable to high-level programs.
1042	*/
1043	const AutoConstantEntry* findAutoConstantEntry(const String& paramName);
1044	/** Finds an auto constant that's affecting a given physical position in
1045	the floating-point buffer
1046	*/
1047	const AutoConstantEntry* _findRawAutoConstantEntryFloat(size_t physicalIndex);
1048	/** Finds an auto constant that's affecting a given physical position in
1049	the integer buffer
1050	*/
1051	const AutoConstantEntry* _findRawAutoConstantEntryInt(size_t physicalIndex);
1052
1053	/** Updates the automatic parameters (except lights) based on the details provided. */
1054	void _updateAutoParamsNoLights(const AutoParamDataSource& source);
1055	/** Updates the automatic parameters for lights based on the details provided. */
1056	void _updateAutoParamsLightsOnly(const AutoParamDataSource& source);
1057
1058	/** Tells the program whether to ignore missing parameters or not.
1059	*/
1060	void setIgnoreMissingParams(bool state) { mIgnoreMissingParams = state; }
1061
1062	/** Sets a single value constant floating-point parameter to the program.
1063	@remarks
1064	Different types of GPU programs support different types of constant parameters.
1065	For example, it's relatively common to find that vertex programs only support
1066	floating point constants, and that fragment programs only support integer (fixed point)
1067	parameters. This can vary depending on the program version supported by the
1068	graphics card being used. You should consult the documentation for the type of
1069	low level program you are using, or alternatively use the methods
1070	provided on RenderSystemCapabilities to determine the options.
1071	@par
1072	Another possible limitation is that some systems only allow constants to be set
1073	on certain boundaries, e.g. in sets of 4 values for example. Again, see
1074	RenderSystemCapabilities for full details.
1075	@note
1076	This named option will only work if you are using a parameters object created
1077	from a high-level program (HighLevelGpuProgram).
1078	@param name The name of the parameter
1079	@param val The value to set
1080	*/
1081	void setNamedConstant(const String& name, Real val);
1082	/** Sets a single value constant integer parameter to the program.
1083	@remarks
1084	Different types of GPU programs support different types of constant parameters.
1085	For example, it's relatively common to find that vertex programs only support
1086	floating point constants, and that fragment programs only support integer (fixed point)
1087	parameters. This can vary depending on the program version supported by the
1088	graphics card being used. You should consult the documentation for the type of
1089	low level program you are using, or alternatively use the methods
1090	provided on RenderSystemCapabilities to determine the options.
1091	@par
1092	Another possible limitation is that some systems only allow constants to be set
1093	on certain boundaries, e.g. in sets of 4 values for example. Again, see
1094	RenderSystemCapabilities for full details.
1095	@note
1096	This named option will only work if you are using a parameters object created
1097	from a high-level program (HighLevelGpuProgram).
1098	@param name The name of the parameter
1099	@param val The value to set
1100	*/
1101	void setNamedConstant(const String& name, int val);
1102	/** Sets a Vector4 parameter to the program.
1103	@param name The name of the parameter
1104	@param vec The value to set
1105	*/
1106	void setNamedConstant(const String& name, const Vector4& vec);
1107	/** Sets a Vector3 parameter to the program.
1108	@note
1109	This named option will only work if you are using a parameters object created
1110	from a high-level program (HighLevelGpuProgram).
1111	@param index The index at which to place the parameter
1112	NB this index refers to the number of floats, so a Vector3 is 3. Note that many
1113	rendersystems & programs assume that every floating point parameter is passed in
1114	as a vector of 4 items, so you are strongly advised to check with
1115	RenderSystemCapabilities before using this version - if in doubt use Vector4
1116	or ColourValue instead (both are 4D).
1117	@param vec The value to set
1118	*/
1119	void setNamedConstant(const String& name, const Vector3& vec);
1120	/** Sets a Matrix4 parameter to the program.
1121	@param name The name of the parameter
1122	@param m The value to set
1123	*/
1124	void setNamedConstant(const String& name, const Matrix4& m);
1125	/** Sets a list of Matrix4 parameters to the program.
1126	@param name The name of the parameter; this must be the first index of an array,
1127	for examples 'matrices[0]'
1128	NB since a Matrix4 is 16 floats long, so each entry will take up 4 indexes.
1129	@param m Pointer to an array of matrices to set
1130	@param numEntries Number of Matrix4 entries
1131	*/
1132	void setNamedConstant(const String& name, const Matrix4* m, size_t numEntries);
1133	/** Sets a multiple value constant floating-point parameter to the program.
1134	@par
1135	Some systems only allow constants to be set on certain boundaries,
1136	e.g. in sets of 4 values for example. The 'multiple' parameter allows
1137	you to control that although you should only change it if you know
1138	your chosen language supports that (at the time of writing, only
1139	GLSL allows constants which are not a multiple of 4).
1140	@note
1141	This named option will only work if you are using a parameters object created
1142	from a high-level program (HighLevelGpuProgram).
1143	@param name The name of the parameter
1144	@param val Pointer to the values to write
1145	@param count The number of 'multiples' of floats to write
1146	@param multiple The number of raw entries in each element to write,
1147	the default is 4 so count = 1 would write 4 floats.
1148	*/
1149	void setNamedConstant(const String& name, const float *val, size_t count,
1150	size_t multiple = 4);
1151	/** Sets a multiple value constant floating-point parameter to the program.
1152	@par
1153	Some systems only allow constants to be set on certain boundaries,
1154	e.g. in sets of 4 values for example. The 'multiple' parameter allows
1155	you to control that although you should only change it if you know
1156	your chosen language supports that (at the time of writing, only
1157	GLSL allows constants which are not a multiple of 4).
1158	@note
1159	This named option will only work if you are using a parameters object created
1160	from a high-level program (HighLevelGpuProgram).
1161	@param name The name of the parameter
1162	@param val Pointer to the values to write
1163	@param count The number of 'multiples' of floats to write
1164	@param multiple The number of raw entries in each element to write,
1165	the default is 4 so count = 1 would write 4 floats.
1166	*/
1167	void setNamedConstant(const String& name, const double *val, size_t count,
1168	size_t multiple = 4);
1169	/** Sets a ColourValue parameter to the program.
1170	@param name The name of the parameter
1171	@param colour The value to set
1172	*/
1173	void setNamedConstant(const String& name, const ColourValue& colour);
1174
1175	/** Sets a multiple value constant floating-point parameter to the program.
1176	@par
1177	Some systems only allow constants to be set on certain boundaries,
1178	e.g. in sets of 4 values for example. The 'multiple' parameter allows
1179	you to control that although you should only change it if you know
1180	your chosen language supports that (at the time of writing, only
1181	GLSL allows constants which are not a multiple of 4).
1182	@note
1183	This named option will only work if you are using a parameters object created
1184	from a high-level program (HighLevelGpuProgram).
1185	@param name The name of the parameter
1186	@param val Pointer to the values to write
1187	@param count The number of 'multiples' of floats to write
1188	@param multiple The number of raw entries in each element to write,
1189	the default is 4 so count = 1 would write 4 floats.
1190	*/
1191	void setNamedConstant(const String& name, const int *val, size_t count,
1192	size_t multiple = 4);
1193
1194	/** Sets up a constant which will automatically be updated by the system.
1195	@remarks
1196	Vertex and fragment programs often need parameters which are to do with the
1197	current render state, or particular values which may very well change over time,
1198	and often between objects which are being rendered. This feature allows you
1199	to set up a certain number of predefined parameter mappings that are kept up to
1200	date for you.
1201	@note
1202	This named option will only work if you are using a parameters object created
1203	from a high-level program (HighLevelGpuProgram).
1204	@param name The name of the parameter
1205	@param acType The type of automatic constant to set
1206	@param extraInfo If the constant type needs more information (like a light index) put it here.
1207	*/
1208	void setNamedAutoConstant(const String& name, AutoConstantType acType, size_t extraInfo = 0);
1209	void setNamedAutoConstantReal(const String& name, AutoConstantType acType, Real rData);
1210
1211	/** Sets a named parameter up to track a derivation of the current time.
1212	@note
1213	This named option will only work if you are using a parameters object created
1214	from a high-level program (HighLevelGpuProgram).
1215	@param name The name of the parameter
1216	@param factor The amount by which to scale the time value
1217	*/
1218	void setNamedConstantFromTime(const String& name, Real factor);
1219
1220	/** Unbind an auto constant so that the constant is manually controlled again. */
1221	void clearNamedAutoConstant(const String& name);
1222
1223	/** Find a constant definition for a named parameter.
1224	@remarks
1225	This method returns null if the named parameter did not exist, unlike
1226	getConstantDefinition which is more strict; unless you set the
1227	last parameter to true.
1228	@param name The name to look up
1229	@param throwExceptionIfMissing If set to true, failure to find an entry
1230	will throw an exception.
1231	*/
1232	const GpuConstantDefinition* _findNamedConstantDefinition(
1233	const String& name, bool throwExceptionIfMissing = false) const;
1234	/** Gets the physical buffer index associated with a logical float constant index.
1235	@note Only applicable to low-level programs.
1236	@param logicalIndex The logical parameter index
1237	@param requestedSize The requested size - pass 0 to ignore missing entries
1238	and return std::numeric_limits<size_t>::max()
1239	*/
1240	size_t _getFloatConstantPhysicalIndex(size_t logicalIndex, size_t requestedSize);
1241	/** Gets the physical buffer index associated with a logical int constant index.
1242	@note Only applicable to low-level programs.
1243	@param logicalIndex The logical parameter index
1244	@param requestedSize The requested size - pass 0 to ignore missing entries
1245	and return std::numeric_limits<size_t>::max()
1246	*/
1247	size_t _getIntConstantPhysicalIndex(size_t logicalIndex, size_t requestedSize);
1248
1249
1250	/** Sets whether or not we need to transpose the matrices passed in from the rest of OGRE.
1251	@remarks
1252	D3D uses transposed matrices compared to GL and OGRE; this is not important when you
1253	use programs which are written to process row-major matrices, such as those generated
1254	by Cg, but if you use a program written to D3D's matrix layout you will need to enable
1255	this flag.
1256	*/
1257	void setTransposeMatrices(bool val) { mTransposeMatrices = val; }
1258	/// Gets whether or not matrices are to be transposed when set
1259	bool getTransposeMatrices(void) const { return mTransposeMatrices; }
1260
1261	/** Copies the values of all constants (including auto constants) from another
1262	GpuProgramParameters object.
1263	*/
1264	void copyConstantsFrom(const GpuProgramParameters& source);
1265
1266	/** gets the auto constant definition associated with name if found else returns NULL
1267	@param name The name of the auto constant
1268	*/
1269	static const AutoConstantDefinition* getAutoConstantDefinition(const String& name);
1270	/** gets the auto constant definition using an index into the auto constant definition array.
1271	If the index is out of bounds then NULL is returned;
1272	@param idx The auto constant index
1273	*/
1274	static const AutoConstantDefinition* getAutoConstantDefinition(const size_t idx);
1275	/** Returns the number of auto constant definitions
1276	*/
1277	static size_t getNumAutoConstantDefinitions(void);
1278
1279
1280	/** increments the multipass number entry by 1 if it exists
1281	*/
1282	void incPassIterationNumber(void);
1283	/** Does this parameters object have a pass iteration number constant? */
1284	bool hasPassIterationNumber() const
1285	{ return mActivePassIterationIndex != (std::numeric_limits<size_t>::max)(); }
1286	/** Get the physical buffer index of the pass iteration number constant */
1287	size_t getPassIterationNumberIndex() const
1288	{ return mActivePassIterationIndex; }
1289
1290
1291	};
1292
1293	/// Shared pointer used to hold references to GpuProgramParameters instances
1294	typedef SharedPtr<GpuProgramParameters> GpuProgramParametersSharedPtr;
1295
1296	// Forward declaration
1297	class GpuProgramPtr;
1298
1299	/** Defines a program which runs on the GPU such as a vertex or fragment program.
1300	@remarks
1301	This class defines the low-level program in assembler code, the sort used to
1302	directly assemble into machine instructions for the GPU to execute. By nature,
1303	this means that the assembler source is rendersystem specific, which is why this
1304	is an abstract class - real instances are created through the RenderSystem.
1305	If you wish to use higher level shading languages like HLSL and Cg, you need to
1306	use the HighLevelGpuProgram class instead.
1307	*/
1308	class _OgreExport GpuProgram : public Resource
1309	{
1310	protected:
1311	/// Command object - see ParamCommand
1312	class _OgreExport CmdType : public ParamCommand
1313	{
1314	public:
1315	String doGet(const void* target) const;
1316	void doSet(void* target, const String& val);
1317	};
1318	class _OgreExport CmdSyntax : public ParamCommand
1319	{
1320	public:
1321	String doGet(const void* target) const;
1322	void doSet(void* target, const String& val);
1323	};
1324	class _OgreExport CmdSkeletal : public ParamCommand
1325	{
1326	public:
1327	String doGet(const void* target) const;
1328	void doSet(void* target, const String& val);
1329	};
1330	class _OgreExport CmdMorph : public ParamCommand
1331	{
1332	public:
1333	String doGet(const void* target) const;
1334	void doSet(void* target, const String& val);
1335	};
1336	class _OgreExport CmdPose : public ParamCommand
1337	{
1338	public:
1339	String doGet(const void* target) const;
1340	void doSet(void* target, const String& val);
1341	};
1342	class _OgreExport CmdVTF : public ParamCommand
1343	{
1344	public:
1345	String doGet(const void* target) const;
1346	void doSet(void* target, const String& val);
1347	};
1348	// Command object for setting / getting parameters
1349	static CmdType msTypeCmd;
1350	static CmdSyntax msSyntaxCmd;
1351	static CmdSkeletal msSkeletalCmd;
1352	static CmdMorph msMorphCmd;
1353	static CmdPose msPoseCmd;
1354	static CmdVTF msVTFCmd;
1355
1356	/// The type of the program
1357	GpuProgramType mType;
1358	/// The name of the file to load source from (may be blank)
1359	String mFilename;
1360	/// The assembler source of the program (may be blank until file loaded)
1361	String mSource;
1362	/// Whether we need to load source from file or not
1363	bool mLoadFromFile;
1364	/// Syntax code eg arbvp1, vs_2_0 etc
1365	String mSyntaxCode;
1366	/// Does this (vertex) program include skeletal animation?
1367	bool mSkeletalAnimation;
1368	/// Does this (vertex) program include morph animation?
1369	bool mMorphAnimation;
1370	/// Does this (vertex) program include pose animation (count of number of poses supported)
1371	ushort mPoseAnimation;
1372	/// Does this (vertex) program require support for vertex texture fetch?
1373	bool mVertexTextureFetch;
1374	/// The default parameters for use with this object
1375	GpuProgramParametersSharedPtr mDefaultParams;
1376	/// Does this program want light states passed through fixed pipeline
1377	bool mPassSurfaceAndLightStates;
1378	/// Did we encounter a compilation error?
1379	bool mCompileError;
1380	/** Record of logical to physical buffer maps. Mandatory for low-level
1381	programs or high-level programs which set their params the same way. */
1382	mutable GpuLogicalBufferStruct mFloatLogicalToPhysical;
1383	/** Record of logical to physical buffer maps. Mandatory for low-level
1384	programs or high-level programs which set their params the same way. */
1385	mutable GpuLogicalBufferStruct mIntLogicalToPhysical;
1386
1387	/** Internal method for setting up the basic parameter definitions for a subclass.
1388	@remarks
1389	Because StringInterface holds a dictionary of parameters per class, subclasses need to
1390	call this to ask the base class to add it's parameters to their dictionary as well.
1391	Can't do this in the constructor because that runs in a non-virtual context.
1392	@par
1393	The subclass must have called it's own createParamDictionary before calling this method.
1394	*/
1395	void setupBaseParamDictionary(void);
1396
1397	/** Internal method returns whether required capabilities for this program is supported.
1398	*/
1399	bool isRequiredCapabilitiesSupported(void) const;
1400
1401	/// @copydoc Resource::calculateSize
1402	size_t calculateSize(void) const { return 0; } // TODO
1403
1404	/// @copydoc Resource::loadImpl
1405	void loadImpl(void);
1406	public:
1407
1408	GpuProgram(ResourceManager* creator, const String& name, ResourceHandle handle,
1409	const String& group, bool isManual = false, ManualResourceLoader* loader = 0);
1410
1411	virtual ~GpuProgram() {}
1412
1413	/** Sets the filename of the source assembly for this program.
1414	@remarks
1415	Setting this will have no effect until you (re)load the program.
1416	*/
1417	virtual void setSourceFile(const String& filename);
1418
1419	/** Sets the source assembly for this program from an in-memory string.
1420	@remarks
1421	Setting this will have no effect until you (re)load the program.
1422	*/
1423	virtual void setSource(const String& source);
1424
1425	/** Gets the syntax code for this program e.g. arbvp1, fp20, vs_1_1 etc */
1426	virtual const String& getSyntaxCode(void) const { return mSyntaxCode; }
1427
1428	/** Sets the syntax code for this program e.g. arbvp1, fp20, vs_1_1 etc */
1429	virtual void setSyntaxCode(const String& syntax);
1430
1431	/** Gets the name of the file used as source for this program. */
1432	virtual const String& getSourceFile(void) const { return mFilename; }
1433	/** Gets the assembler source for this program. */
1434	virtual const String& getSource(void) const { return mSource; }
1435	/// Set the program type (only valid before load)
1436	virtual void setType(GpuProgramType t);
1437	/// Get the program type
1438	virtual GpuProgramType getType(void) const { return mType; }
1439
1440	/** Returns the GpuProgram which should be bound to the pipeline.
1441	@remarks
1442	This method is simply to allow some subclasses of GpuProgram to delegate
1443	the program which is bound to the pipeline to a delegate, if required. */
1444	virtual GpuProgram* _getBindingDelegate(void) { return this; }
1445
1446	/** Returns whether this program can be supported on the current renderer and hardware. */
1447	virtual bool isSupported(void) const;
1448
1449	/** Creates a new parameters object compatible with this program definition.
1450	@remarks
1451	It is recommended that you use this method of creating parameters objects
1452	rather than going direct to GpuProgramManager, because this method will
1453	populate any implementation-specific extras (like named parameters) where
1454	they are appropriate.
1455	*/
1456	virtual GpuProgramParametersSharedPtr createParameters(void);
1457
1458	/** Sets whether a vertex program includes the required instructions
1459	to perform skeletal animation.
1460	@remarks
1461	If this is set to true, OGRE will not blend the geometry according to
1462	skeletal animation, it will expect the vertex program to do it.
1463	*/
1464	virtual void setSkeletalAnimationIncluded(bool included)
1465	{ mSkeletalAnimation = included; }
1466
1467	/** Returns whether a vertex program includes the required instructions
1468	to perform skeletal animation.
1469	@remarks
1470	If this returns true, OGRE will not blend the geometry according to
1471	skeletal animation, it will expect the vertex program to do it.
1472	*/
1473	virtual bool isSkeletalAnimationIncluded(void) const { return mSkeletalAnimation; }
1474
1475	/** Sets whether a vertex program includes the required instructions
1476	to perform morph animation.
1477	@remarks
1478	If this is set to true, OGRE will not blend the geometry according to
1479	morph animation, it will expect the vertex program to do it.
1480	*/
1481	virtual void setMorphAnimationIncluded(bool included)
1482	{ mMorphAnimation = included; }
1483
1484	/** Sets whether a vertex program includes the required instructions
1485	to perform pose animation.
1486	@remarks
1487	If this is set to true, OGRE will not blend the geometry according to
1488	pose animation, it will expect the vertex program to do it.
1489	@param poseCount The number of simultaneous poses the program can blend
1490	*/
1491	virtual void setPoseAnimationIncluded(ushort poseCount)
1492	{ mPoseAnimation = poseCount; }
1493
1494	/** Returns whether a vertex program includes the required instructions
1495	to perform morph animation.
1496	@remarks
1497	If this returns true, OGRE will not blend the geometry according to
1498	morph animation, it will expect the vertex program to do it.
1499	*/
1500	virtual bool isMorphAnimationIncluded(void) const { return mMorphAnimation; }
1501
1502	/** Returns whether a vertex program includes the required instructions
1503	to perform pose animation.
1504	@remarks
1505	If this returns true, OGRE will not blend the geometry according to
1506	pose animation, it will expect the vertex program to do it.
1507	*/
1508	virtual bool isPoseAnimationIncluded(void) const { return mPoseAnimation > 0; }
1509	/** Returns the number of simultaneous poses the vertex program can
1510	blend, for use in pose animation.
1511	*/
1512	virtual ushort getNumberOfPosesIncluded(void) const { return mPoseAnimation; }
1513	/** Sets whether this vertex program requires support for vertex
1514	texture fetch from the hardware.
1515	*/
1516	virtual void setVertexTextureFetchRequired(bool r) { mVertexTextureFetch = r; }
1517	/** Returns whether this vertex program requires support for vertex
1518	texture fetch from the hardware.
1519	*/
1520	virtual bool isVertexTextureFetchRequired(void) const { return mVertexTextureFetch; }
1521
1522	/** Get a reference to the default parameters which are to be used for all
1523	uses of this program.
1524	@remarks
1525	A program can be set up with a list of default parameters, which can save time when
1526	using a program many times in a material with roughly the same settings. By
1527	retrieving the default parameters and populating it with the most used options,
1528	any new parameter objects created from this program afterwards will automatically include
1529	the default parameters; thus users of the program need only change the parameters
1530	which are unique to their own usage of the program.
1531	*/
1532	virtual GpuProgramParametersSharedPtr getDefaultParameters(void);
1533
1534	/** Returns true if default parameters have been set up.
1535	*/
1536	virtual bool hasDefaultParameters(void) const { return !mDefaultParams.isNull(); }
1537
1538	/** Sets whether a vertex program requires light and material states to be passed
1539	to through fixed pipeline low level API rendering calls.
1540	@remarks
1541	If this is set to true, OGRE will pass all active light states to the fixed function
1542	pipeline. This is useful for high level shaders like GLSL that can read the OpenGL
1543	light and material states. This way the user does not have to use autoparameters to
1544	pass light position, color etc.
1545	*/
1546	virtual void setSurfaceAndPassLightStates(bool state)
1547	{ mPassSurfaceAndLightStates = state; }
1548
1549	/** Returns whether a vertex program wants light and material states to be passed
1550	through fixed pipeline low level API rendering calls
1551	*/
1552	virtual bool getPassSurfaceAndLightStates(void) const { return mPassSurfaceAndLightStates; }
1553
1554	/** Returns a string that specifies the language of the gpu programs as specified
1555	in a material script. ie: asm, cg, hlsl, glsl
1556	*/
1557	virtual const String& getLanguage(void) const;
1558
1559	/** Did this program encounter a compile error when loading?
1560	*/
1561	virtual bool hasCompileError(void) const { return mCompileError; }
1562
1563	/** Reset a compile error if it occurred, allowing the load to be retried
1564	*/
1565	virtual void resetCompileError(void) { mCompileError = false; }
1566	protected:
1567	/// Virtual method which must be implemented by subclasses, load from mSource
1568	virtual void loadFromSource(void) = 0;
1569
1570	};
1571
1572
1573	/** Specialisation of SharedPtr to allow SharedPtr to be assigned to GpuProgramPtr
1574	@note Has to be a subclass since we need operator=.
1575	We could templatise this instead of repeating per Resource subclass,
1576	except to do so requires a form VC6 does not support i.e.
1577	ResourceSubclassPtr<T> : public SharedPtr<T>
1578	*/
1579	class _OgreExport GpuProgramPtr : public SharedPtr<GpuProgram>
1580	{
1581	public:
1582	GpuProgramPtr() : SharedPtr<GpuProgram>() {}
1583	explicit GpuProgramPtr(GpuProgram* rep) : SharedPtr<GpuProgram>(rep) {}
1584	GpuProgramPtr(const GpuProgramPtr& r) : SharedPtr<GpuProgram>(r) {}
1585	GpuProgramPtr(const ResourcePtr& r) : SharedPtr<GpuProgram>()
1586	{
1587	// lock & copy other mutex pointer
1588	OGRE_MUTEX_CONDITIONAL(r.OGRE_AUTO_MUTEX_NAME)
1589	{
1590	OGRE_LOCK_MUTEX(*r.OGRE_AUTO_MUTEX_NAME)
1591	OGRE_COPY_AUTO_SHARED_MUTEX(r.OGRE_AUTO_MUTEX_NAME)
1592	pRep = static_cast<GpuProgram*>(r.getPointer());
1593	pUseCount = r.useCountPointer();
1594	if (pUseCount)
1595	{
1596	++(*pUseCount);
1597	}
1598	}
1599	}
1600
1601	/// Operator used to convert a ResourcePtr to a GpuProgramPtr
1602	GpuProgramPtr& operator=(const ResourcePtr& r)
1603	{
1604	if (pRep == static_cast<GpuProgram*>(r.getPointer()))
1605	return *this;
1606	release();
1607	// lock & copy other mutex pointer
1608	OGRE_MUTEX_CONDITIONAL(r.OGRE_AUTO_MUTEX_NAME)
1609	{
1610	OGRE_LOCK_MUTEX(*r.OGRE_AUTO_MUTEX_NAME)
1611	OGRE_COPY_AUTO_SHARED_MUTEX(r.OGRE_AUTO_MUTEX_NAME)
1612	pRep = static_cast<GpuProgram*>(r.getPointer());
1613	pUseCount = r.useCountPointer();
1614	if (pUseCount)
1615	{
1616	++(*pUseCount);
1617	}
1618	}
1619	else
1620	{
1621	// RHS must be a null pointer
1622	assert(r.isNull() && "RHS must be null if it has no mutex!");
1623	setNull();
1624	}
1625	return *this;
1626	}
1627	/// Operator used to convert a HighLevelGpuProgramPtr to a GpuProgramPtr
1628	GpuProgramPtr& operator=(const HighLevelGpuProgramPtr& r);
1629	};
1630	}
1631
1632	#endif

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