1 | /* |
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2 | ----------------------------------------------------------------------------- |
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3 | This source file is part of OGRE |
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4 | (Object-oriented Graphics Rendering Engine) |
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5 | For the latest info, see http://www.ogre3d.org/ |
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6 | |
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7 | Copyright (c) 2000-2006 Torus Knot Software Ltd |
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8 | Also see acknowledgements in Readme.html |
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9 | |
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10 | This program is free software; you can redistribute it and/or modify it under |
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11 | the terms of the GNU Lesser General Public License as published by the Free Software |
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12 | Foundation; either version 2 of the License, or (at your option) any later |
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13 | version. |
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14 | |
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15 | This program is distributed in the hope that it will be useful, but WITHOUT |
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16 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. |
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18 | |
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19 | You should have received a copy of the GNU Lesser General Public License along with |
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20 | this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
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21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to |
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22 | http://www.gnu.org/copyleft/lesser.txt. |
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23 | |
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24 | You may alternatively use this source under the terms of a specific version of |
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25 | the OGRE Unrestricted License provided you have obtained such a license from |
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26 | Torus Knot Software Ltd. |
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27 | ----------------------------------------------------------------------------- |
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28 | */ |
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29 | |
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30 | #include "OgreGLFBORenderTexture.h" |
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31 | #include "OgreGLPixelFormat.h" |
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32 | #include "OgreLogManager.h" |
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33 | #include "OgreStringConverter.h" |
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34 | #include "OgreRoot.h" |
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35 | #include "OgreGLHardwarePixelBuffer.h" |
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36 | #include "OgreGLFBOMultiRenderTarget.h" |
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37 | |
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38 | namespace Ogre { |
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39 | |
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40 | //----------------------------------------------------------------------------- |
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41 | GLFBORenderTexture::GLFBORenderTexture(GLFBOManager *manager, const String &name, |
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42 | const GLSurfaceDesc &target): |
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43 | GLRenderTexture(name, target), |
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44 | mFB(manager) |
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45 | { |
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46 | // Bind target to surface 0 and initialise |
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47 | mFB.bindSurface(0, target); |
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48 | // Get attributes |
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49 | mWidth = mFB.getWidth(); |
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50 | mHeight = mFB.getHeight(); |
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51 | } |
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52 | |
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53 | void GLFBORenderTexture::getCustomAttribute(const String& name, void* pData) |
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54 | { |
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55 | if(name=="FBO") |
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56 | { |
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57 | *static_cast<GLFrameBufferObject **>(pData) = &mFB; |
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58 | } |
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59 | } |
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60 | |
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61 | /// Size of probe texture |
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62 | #define PROBE_SIZE 16 |
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63 | |
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64 | /// Stencil and depth formats to be tried |
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65 | static const GLenum stencilFormats[] = |
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66 | { |
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67 | GL_NONE, // No stencil |
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68 | GL_STENCIL_INDEX1_EXT, |
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69 | GL_STENCIL_INDEX4_EXT, |
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70 | GL_STENCIL_INDEX8_EXT, |
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71 | GL_STENCIL_INDEX16_EXT |
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72 | }; |
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73 | static const size_t stencilBits[] = |
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74 | { |
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75 | 0, 1, 4, 8, 16 |
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76 | }; |
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77 | #define STENCILFORMAT_COUNT (sizeof(stencilFormats)/sizeof(GLenum)) |
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78 | |
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79 | static const GLenum depthFormats[] = |
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80 | { |
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81 | GL_NONE, |
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82 | GL_DEPTH_COMPONENT16, |
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83 | GL_DEPTH_COMPONENT24, // Prefer 24 bit depth |
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84 | GL_DEPTH_COMPONENT32, |
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85 | GL_DEPTH24_STENCIL8_EXT // packed depth / stencil |
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86 | }; |
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87 | static const size_t depthBits[] = |
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88 | { |
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89 | 0,16,24,32,24 |
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90 | }; |
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91 | #define DEPTHFORMAT_COUNT (sizeof(depthFormats)/sizeof(GLenum)) |
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92 | |
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93 | GLFBOManager::GLFBOManager(bool atimode): |
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94 | mATIMode(atimode) |
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95 | { |
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96 | detectFBOFormats(); |
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97 | |
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98 | glGenFramebuffersEXT(1, &mTempFBO); |
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99 | } |
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100 | |
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101 | GLFBOManager::~GLFBOManager() |
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102 | { |
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103 | if(!mRenderBufferMap.empty()) |
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104 | { |
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105 | LogManager::getSingleton().logMessage("GL: Warning! GLFBOManager destructor called, but not all renderbuffers were released."); |
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106 | } |
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107 | |
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108 | glDeleteFramebuffersEXT(1, &mTempFBO); |
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109 | } |
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110 | |
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111 | /** Try a certain FBO format, and return the status. Also sets mDepthRB and mStencilRB. |
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112 | @returns true if this combo is supported |
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113 | false if this combo is not supported |
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114 | */ |
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115 | GLuint GLFBOManager::_tryFormat(GLenum depthFormat, GLenum stencilFormat) |
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116 | { |
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117 | GLuint status, depthRB = 0, stencilRB = 0; |
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118 | bool failed = false; // flag on GL errors |
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119 | |
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120 | if(depthFormat != GL_NONE) |
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121 | { |
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122 | /// Generate depth renderbuffer |
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123 | glGenRenderbuffersEXT(1, &depthRB); |
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124 | /// Bind it to FBO |
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125 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthRB); |
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126 | |
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127 | /// Allocate storage for depth buffer |
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128 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, depthFormat, |
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129 | PROBE_SIZE, PROBE_SIZE); |
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130 | |
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131 | /// Attach depth |
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132 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, |
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133 | GL_RENDERBUFFER_EXT, depthRB); |
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134 | } |
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135 | |
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136 | if(stencilFormat != GL_NONE) |
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137 | { |
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138 | /// Generate stencil renderbuffer |
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139 | glGenRenderbuffersEXT(1, &stencilRB); |
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140 | /// Bind it to FBO |
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141 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, stencilRB); |
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142 | glGetError(); // NV hack |
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143 | /// Allocate storage for stencil buffer |
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144 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, stencilFormat, |
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145 | PROBE_SIZE, PROBE_SIZE); |
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146 | if(glGetError() != GL_NO_ERROR) // NV hack |
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147 | failed = true; |
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148 | /// Attach stencil |
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149 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, |
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150 | GL_RENDERBUFFER_EXT, stencilRB); |
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151 | if(glGetError() != GL_NO_ERROR) // NV hack |
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152 | failed = true; |
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153 | } |
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154 | |
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155 | status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); |
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156 | /// If status is negative, clean up |
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157 | // Detach and destroy |
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158 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0); |
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159 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0); |
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160 | if (depthRB) |
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161 | glDeleteRenderbuffersEXT(1, &depthRB); |
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162 | if (stencilRB) |
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163 | glDeleteRenderbuffersEXT(1, &stencilRB); |
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164 | |
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165 | return status == GL_FRAMEBUFFER_COMPLETE_EXT && !failed; |
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166 | } |
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167 | |
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168 | /** Try a certain packed depth/stencil format, and return the status. |
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169 | @returns true if this combo is supported |
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170 | false if this combo is not supported |
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171 | */ |
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172 | bool GLFBOManager::_tryPackedFormat(GLenum packedFormat) |
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173 | { |
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174 | GLuint packedRB; |
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175 | bool failed = false; // flag on GL errors |
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176 | |
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177 | /// Generate renderbuffer |
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178 | glGenRenderbuffersEXT(1, &packedRB); |
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179 | |
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180 | /// Bind it to FBO |
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181 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, packedRB); |
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182 | |
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183 | /// Allocate storage for buffer |
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184 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, packedFormat, PROBE_SIZE, PROBE_SIZE); |
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185 | glGetError(); // NV hack |
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186 | |
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187 | /// Attach depth |
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188 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, |
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189 | GL_RENDERBUFFER_EXT, packedRB); |
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190 | if(glGetError() != GL_NO_ERROR) // NV hack |
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191 | failed = true; |
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192 | |
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193 | /// Attach stencil |
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194 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, |
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195 | GL_RENDERBUFFER_EXT, packedRB); |
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196 | if(glGetError() != GL_NO_ERROR) // NV hack |
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197 | failed = true; |
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198 | |
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199 | GLuint status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); |
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200 | |
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201 | /// Detach and destroy |
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202 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0); |
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203 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, 0); |
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204 | glDeleteRenderbuffersEXT(1, &packedRB); |
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205 | |
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206 | return status == GL_FRAMEBUFFER_COMPLETE_EXT && !failed; |
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207 | } |
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208 | |
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209 | /** Detect which internal formats are allowed as RTT |
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210 | Also detect what combinations of stencil and depth are allowed with this internal |
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211 | format. |
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212 | */ |
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213 | void GLFBOManager::detectFBOFormats() |
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214 | { |
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215 | // Try all formats, and report which ones work as target |
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216 | GLuint fb, tid; |
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217 | GLint old_drawbuffer, old_readbuffer; |
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218 | GLenum target = GL_TEXTURE_2D; |
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219 | |
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220 | glGetIntegerv (GL_DRAW_BUFFER, &old_drawbuffer); |
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221 | glGetIntegerv (GL_READ_BUFFER, &old_readbuffer); |
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222 | |
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223 | for(size_t x=0; x<PF_COUNT; ++x) |
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224 | { |
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225 | mProps[x].valid = false; |
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226 | |
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227 | // Fetch GL format token |
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228 | GLenum fmt = GLPixelUtil::getGLInternalFormat((PixelFormat)x); |
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229 | if(fmt == GL_NONE && x!=0) |
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230 | continue; |
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231 | |
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232 | // No test for compressed formats |
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233 | if(PixelUtil::isCompressed((PixelFormat)x)) |
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234 | continue; |
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235 | |
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236 | // Buggy ATI cards *crash* on non-RGB(A) formats |
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237 | int depths[4]; |
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238 | PixelUtil::getBitDepths((PixelFormat)x, depths); |
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239 | if(fmt!=GL_NONE && mATIMode && (!depths[0] || !depths[1] || !depths[2])) |
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240 | continue; |
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241 | |
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242 | // Create and attach framebuffer |
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243 | glGenFramebuffersEXT(1, &fb); |
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244 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb); |
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245 | if (fmt!=GL_NONE) |
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246 | { |
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247 | // Create and attach texture |
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248 | glGenTextures(1, &tid); |
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249 | glBindTexture(target, tid); |
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250 | |
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251 | // Set some default parameters so it won't fail on NVidia cards |
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252 | glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, 0); |
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253 | glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
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254 | glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
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255 | glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
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256 | glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
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257 | |
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258 | glTexImage2D(target, 0, fmt, PROBE_SIZE, PROBE_SIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0); |
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259 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, |
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260 | target, tid, 0); |
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261 | } |
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262 | else |
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263 | { |
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264 | // Draw to nowhere -- stencil/depth only |
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265 | glDrawBuffer(GL_NONE); |
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266 | glReadBuffer(GL_NONE); |
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267 | } |
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268 | // Check status |
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269 | GLuint status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); |
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270 | |
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271 | // Ignore status in case of fmt==GL_NONE, because no implementation will accept |
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272 | // a buffer without *any* attachment. Buffers with only stencil and depth attachment |
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273 | // might still be supported, so we must continue probing. |
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274 | if(fmt == GL_NONE || status == GL_FRAMEBUFFER_COMPLETE_EXT) |
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275 | { |
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276 | mProps[x].valid = true; |
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277 | StringUtil::StrStreamType str; |
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278 | str << "FBO " << PixelUtil::getFormatName((PixelFormat)x) |
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279 | << " depth/stencil support: "; |
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280 | |
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281 | // For each depth/stencil formats |
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282 | for (size_t depth = 0; depth < DEPTHFORMAT_COUNT; ++depth) |
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283 | { |
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284 | if (depthFormats[depth] != GL_DEPTH24_STENCIL8_EXT) |
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285 | { |
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286 | // General depth/stencil combination |
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287 | |
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288 | for (size_t stencil = 0; stencil < STENCILFORMAT_COUNT; ++stencil) |
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289 | { |
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290 | //StringUtil::StrStreamType l; |
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291 | //l << "Trying " << PixelUtil::getFormatName((PixelFormat)x) |
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292 | // << " D" << depthBits[depth] |
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293 | // << "S" << stencilBits[stencil]; |
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294 | //LogManager::getSingleton().logMessage(l.str()); |
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295 | |
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296 | if (_tryFormat(depthFormats[depth], stencilFormats[stencil])) |
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297 | { |
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298 | /// Add mode to allowed modes |
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299 | str << "D" << depthBits[depth] << "S" << stencilBits[stencil] << " "; |
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300 | FormatProperties::Mode mode; |
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301 | mode.depth = depth; |
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302 | mode.stencil = stencil; |
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303 | mProps[x].modes.push_back(mode); |
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304 | } |
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305 | } |
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306 | } |
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307 | else |
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308 | { |
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309 | // Packed depth/stencil format |
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310 | |
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311 | #if OGRE_PLATFORM == OGRE_PLATFORM_LINUX |
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312 | // Only query packed depth/stencil formats for 32-bit |
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313 | // non-floating point formats (ie not R32!) |
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314 | // Linux nVidia driver segfaults if you query others |
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315 | if (PixelUtil::getNumElemBits((PixelFormat)x) != 32 || |
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316 | PixelUtil::isFloatingPoint((PixelFormat)x)) |
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317 | { |
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318 | continue; |
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319 | } |
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320 | #endif |
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321 | |
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322 | if (_tryPackedFormat(depthFormats[depth])) |
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323 | { |
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324 | /// Add mode to allowed modes |
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325 | str << "Packed-D" << depthBits[depth] << "S" << 8 << " "; |
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326 | FormatProperties::Mode mode; |
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327 | mode.depth = depth; |
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328 | mode.stencil = 0; // unuse |
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329 | mProps[x].modes.push_back(mode); |
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330 | } |
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331 | } |
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332 | } |
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333 | |
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334 | LogManager::getSingleton().logMessage(str.str()); |
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335 | |
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336 | } |
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337 | // Delete texture and framebuffer |
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338 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
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339 | glDeleteFramebuffersEXT(1, &fb); |
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340 | if (fmt!=GL_NONE) |
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341 | glDeleteTextures(1, &tid); |
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342 | } |
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343 | |
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344 | // It seems a bug in nVidia driver: glBindFramebufferEXT should restore |
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345 | // draw and read buffers, but in some unclear circumstances it won't. |
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346 | glDrawBuffer(old_drawbuffer); |
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347 | glReadBuffer(old_readbuffer); |
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348 | |
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349 | std::string fmtstring; |
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350 | for(size_t x=0; x<PF_COUNT; ++x) |
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351 | { |
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352 | if(mProps[x].valid) |
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353 | fmtstring += PixelUtil::getFormatName((PixelFormat)x)+" "; |
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354 | } |
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355 | LogManager::getSingleton().logMessage("[GL] : Valid FBO targets " + fmtstring); |
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356 | } |
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357 | void GLFBOManager::getBestDepthStencil(GLenum internalFormat, GLenum *depthFormat, GLenum *stencilFormat) |
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358 | { |
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359 | const FormatProperties &props = mProps[internalFormat]; |
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360 | /// Decide what stencil and depth formats to use |
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361 | /// [best supported for internal format] |
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362 | size_t bestmode=0; |
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363 | int bestscore=-1; |
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364 | for(size_t mode=0; mode<props.modes.size(); mode++) |
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365 | { |
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366 | #if 0 |
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367 | /// Always prefer D24S8 |
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368 | if(stencilBits[props.modes[mode].stencil]==8 && |
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369 | depthBits[props.modes[mode].depth]==24) |
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370 | { |
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371 | bestmode = mode; |
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372 | break; |
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373 | } |
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374 | #endif |
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375 | int desirability = 0; |
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376 | /// Find most desirable mode |
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377 | /// desirability == 0 if no depth, no stencil |
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378 | /// desirability == 1000...2000 if no depth, stencil |
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379 | /// desirability == 2000...3000 if depth, no stencil |
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380 | /// desirability == 3000+ if depth and stencil |
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381 | /// beyond this, the total numer of bits (stencil+depth) is maximised |
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382 | if(props.modes[mode].stencil) |
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383 | desirability += 1000; |
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384 | if(props.modes[mode].depth) |
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385 | desirability += 2000; |
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386 | if(depthBits[props.modes[mode].depth]==24) // Prefer 24 bit for now |
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387 | desirability += 500; |
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388 | if(depthFormats[props.modes[mode].depth]==GL_DEPTH24_STENCIL8_EXT) // Prefer 24/8 packed |
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389 | desirability += 5000; |
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390 | desirability += stencilBits[props.modes[mode].stencil] + depthBits[props.modes[mode].depth]; |
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391 | |
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392 | if(desirability>bestscore) |
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393 | { |
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394 | bestscore = desirability; |
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395 | bestmode = mode; |
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396 | } |
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397 | } |
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398 | *depthFormat = depthFormats[props.modes[bestmode].depth]; |
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399 | *stencilFormat = stencilFormats[props.modes[bestmode].stencil]; |
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400 | } |
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401 | |
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402 | GLFBORenderTexture *GLFBOManager::createRenderTexture(const String &name, const GLSurfaceDesc &target) |
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403 | { |
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404 | GLFBORenderTexture *retval = new GLFBORenderTexture(this, name, target); |
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405 | return retval; |
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406 | } |
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407 | MultiRenderTarget *GLFBOManager::createMultiRenderTarget(const String & name) |
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408 | { |
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409 | return new GLFBOMultiRenderTarget(this, name); |
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410 | } |
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411 | |
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412 | GLFrameBufferObject *GLFBOManager::createFrameBufferObject() |
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413 | { |
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414 | return new GLFrameBufferObject(this); |
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415 | } |
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416 | |
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417 | void GLFBOManager::destroyFrameBufferObject(GLFrameBufferObject * x) |
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418 | { |
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419 | delete x; |
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420 | } |
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421 | void GLFBOManager::bind(RenderTarget *target) |
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422 | { |
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423 | /// Check if the render target is in the rendertarget->FBO map |
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424 | GLFrameBufferObject *fbo = 0; |
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425 | target->getCustomAttribute("FBO", &fbo); |
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426 | if(fbo) |
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427 | fbo->bind(); |
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428 | else |
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429 | // Old style context (window/pbuffer) or copying render texture |
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430 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
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431 | } |
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432 | |
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433 | GLSurfaceDesc GLFBOManager::requestRenderBuffer(GLenum format, size_t width, size_t height) |
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434 | { |
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435 | GLSurfaceDesc retval; |
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436 | retval.buffer = 0; // Return 0 buffer if GL_NONE is requested |
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437 | if(format != GL_NONE) |
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438 | { |
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439 | RBFormat key(format, width, height); |
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440 | RenderBufferMap::iterator it = mRenderBufferMap.find(key); |
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441 | if(it != mRenderBufferMap.end()) |
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442 | { |
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443 | retval.buffer = it->second.buffer; |
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444 | retval.zoffset = 0; |
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445 | // Increase refcount |
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446 | ++it->second.refcount; |
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447 | } |
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448 | else |
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449 | { |
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450 | // New one |
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451 | GLRenderBuffer *rb = new GLRenderBuffer(format, width, height); |
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452 | mRenderBufferMap[key] = RBRef(rb); |
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453 | retval.buffer = rb; |
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454 | retval.zoffset = 0; |
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455 | } |
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456 | } |
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457 | //std::cerr << "Requested renderbuffer with format " << std::hex << format << std::dec << " of " << width << "x" << height << " :" << retval.buffer << std::endl; |
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458 | return retval; |
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459 | } |
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460 | //----------------------------------------------------------------------- |
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461 | void GLFBOManager::requestRenderBuffer(const GLSurfaceDesc &surface) |
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462 | { |
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463 | if(surface.buffer == 0) |
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464 | return; |
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465 | RBFormat key(surface.buffer->getGLFormat(), surface.buffer->getWidth(), surface.buffer->getHeight()); |
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466 | RenderBufferMap::iterator it = mRenderBufferMap.find(key); |
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467 | assert(it != mRenderBufferMap.end()); |
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468 | if (it != mRenderBufferMap.end()) // Just in case |
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469 | { |
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470 | assert(it->second.buffer == surface.buffer); |
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471 | // Increase refcount |
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472 | ++it->second.refcount; |
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473 | } |
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474 | } |
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475 | //----------------------------------------------------------------------- |
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476 | void GLFBOManager::releaseRenderBuffer(const GLSurfaceDesc &surface) |
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477 | { |
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478 | if(surface.buffer == 0) |
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479 | return; |
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480 | RBFormat key(surface.buffer->getGLFormat(), surface.buffer->getWidth(), surface.buffer->getHeight()); |
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481 | RenderBufferMap::iterator it = mRenderBufferMap.find(key); |
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482 | if(it != mRenderBufferMap.end()) |
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483 | { |
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484 | // Decrease refcount |
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485 | --it->second.refcount; |
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486 | if(it->second.refcount==0) |
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487 | { |
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488 | // If refcount reaches zero, delete buffer and remove from map |
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489 | delete it->second.buffer; |
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490 | mRenderBufferMap.erase(it); |
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491 | //std::cerr << "Destroyed renderbuffer of format " << std::hex << key.format << std::dec |
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492 | // << " of " << key.width << "x" << key.height << std::endl; |
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493 | } |
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494 | } |
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495 | } |
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496 | } |
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