source: downloads/ogre/RenderSystems/GL/src/OSX/OgreOSXWindow.cpp @ 48

/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2006 Torus Knot Software Ltd
Also see acknowledgements in Readme.html

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/

#include "OgreOSXWindow.h"
#include "OgreOSXCGLContext.h"
#include "OgreRoot.h"
#include "OgreGLRenderSystem.h"
#include "OgreImageCodec.h"
#include "OgreException.h"
#include "OgreLogManager.h"
#include "OgreStringConverter.h"

#include <OpenGL/gl.h>
#define GL_EXT_texture_env_combine 1
#include <OpenGL/glext.h>
#include <OpenGL/glu.h>

namespace Ogre
{

//-------------------------------------------------------------------------------------------------//
OSXWindow::OSXWindow() : mCGLContext(NULL)
{
}

//-------------------------------------------------------------------------------------------------//
OSXWindow::~OSXWindow()
{
}

//-------------------------------------------------------------------------------------------------//
void OSXWindow::writeContentsToFile(const String& filename)
{
        ImageCodec::ImageData* imgData = new ImageCodec::ImageData;
        imgData->width = mWidth;
        imgData->height = mHeight;
        imgData->format = PF_BYTE_RGB;

        // Allocate buffer
        uchar* pBuffer = new uchar[mWidth * mHeight * 3];

        // Read pixels
        // I love GL: it does all the locking & colour conversion for us
        glReadPixels(0,0, mWidth-1, mHeight-1, GL_RGB, GL_UNSIGNED_BYTE, pBuffer);

        // Wrap buffer in a memory stream
        DataStreamPtr stream(new MemoryDataStream(pBuffer, mWidth * mHeight * 3, false));

        // Need to flip the read data over in Y though
        Image img;
        img.loadRawData(stream, mWidth, mHeight, PF_BYTE_RGB );
        img.flipAroundX();

        MemoryDataStreamPtr streamFlipped(new MemoryDataStream(img.getData(), stream->size(), false));

        // Get codec
        size_t pos = filename.find_last_of(".");
        String extension;
        if( pos == String::npos )
                OGRE_EXCEPT( Exception::ERR_INVALIDPARAMS, "Unable to determine image type for '" 
                        + filename + "' - invalid extension.", "OSXCarbonWindow::writeContentsToFile" );

        while( pos != filename.length() - 1 )
                extension += filename[++pos];

        // Get the codec
        Codec * pCodec = Codec::getCodec(extension);

        // Write out
        Codec::CodecDataPtr codecDataPtr(imgData);
        pCodec->codeToFile(streamFlipped, filename, codecDataPtr);

        delete [] pBuffer;
}

//-------------------------------------------------------------------------------------------------//
void OSXWindow::createCGLFullscreen(unsigned int width, unsigned int height, unsigned int depth, unsigned int fsaa, CGLContextObj sharedContext)
{
                // Find the best match to what was requested
                boolean_t exactMatch;
                CFDictionaryRef displayMode = CGDisplayBestModeForParameters(kCGDirectMainDisplay, depth, width, height, &exactMatch);
                
                if(!exactMatch)
                {
                        // TODO: Report the size difference
                        // That mode is not available, using the closest match
                        String request = StringConverter::toString(width) + String(" x ") + StringConverter::toString(height) + String(" @ ") + 
                                StringConverter::toString(depth) + "bpp. ";
                                
                        String recieved = StringConverter::toString(width) + String(" x ") + StringConverter::toString(height) + String(" @ ") + 
                                StringConverter::toString(depth) + "bpp. "; 
                                
                        LogManager::getSingleton().logMessage(String("RenderSystem Warning:  You requested a fullscreen mode of ") + request +
                                String(" This mode is not available and you will recieve the closest match."));
                }
                
                // Do the fancy display fading
                CGDisplayFadeReservationToken reservationToken;
                CGAcquireDisplayFadeReservation(kCGMaxDisplayReservationInterval,
                                                                                        &reservationToken);
                CGDisplayFade(reservationToken,
                                          0.5,
                                          kCGDisplayBlendNormal,
                                          kCGDisplayBlendSolidColor,
                                          0.0, 0.0, 0.0,
                                          true);
                
                // Grab the main display and save it for later.
                // You could render to any display, but picking what display
                // to render to could be interesting.
                CGDisplayCapture(kCGDirectMainDisplay);
                
                // Switch to the correct resolution
                CGDisplaySwitchToMode(kCGDirectMainDisplay, displayMode);
                
                // Get a pixel format that best matches what we are looking for
                CGLPixelFormatAttribute attribs[] = { 
                        kCGLPFADoubleBuffer,
                        kCGLPFAAlphaSize,     (CGLPixelFormatAttribute)8,
                        kCGLPFADepthSize,     (CGLPixelFormatAttribute)depth,
                        kCGLPFAStencilSize,   (CGLPixelFormatAttribute)8,
                        kCGLPFASampleBuffers, (CGLPixelFormatAttribute)0,
                        kCGLPFASamples,       (CGLPixelFormatAttribute)0,
                        kCGLPFAFullScreen,
                        kCGLPFASingleRenderer,
                        kCGLPFAAccelerated,
                        kCGLPFADisplayMask,   (CGLPixelFormatAttribute)CGDisplayIDToOpenGLDisplayMask(kCGDirectMainDisplay),
                        (CGLPixelFormatAttribute)0
                };
                
                // Set up FSAA if it was requested
                if(fsaa > 1)
                {
                                // turn on kCGLPFASampleBuffers
                                attribs[8] = (CGLPixelFormatAttribute)1;
                                // set the samples for kCGLPFASamples
                                attribs[10] = (CGLPixelFormatAttribute)fsaa;
                }
                
                // Storage for our pixel format
                CGLPixelFormatObj pixelFormatObj;
                long numPixelFormats = 0;
                
                // Get a pixelFormatObj from our atributes
                CGLError err;
                err = CGLChoosePixelFormat(attribs, &pixelFormatObj, &numPixelFormats); 
                if(err != 0)
                {
                        CGReleaseAllDisplays();
                        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, String("CGL Error: " + String(CGLErrorString(err))), "OSXCarbonWindow::create");
                }

                // Create the CGLcontext from our pixel format, share it with the sharedContext passed in
                err = CGLCreateContext(pixelFormatObj, sharedContext, &mCGLContext);
                if(err != 0)
                {
                        CGReleaseAllDisplays();
                        OGRE_EXCEPT(Exception::ERR_RENDERINGAPI_ERROR, String("CGL Error: " + String(CGLErrorString(err))), "OSXCarbonWindow::create");
                }
                                
                // Once we have the context we can destroy the pixel format
                CGLDestroyPixelFormat(pixelFormatObj); 
                                
                // Set the context to drawable
                CGLSetFullScreen(mCGLContext);
                
                // Set the context as current
                CGLSetCurrentContext(mCGLContext);
                
                // This synchronizes CGL with the vertical retrace
                // Apple docs suggest that OpenGL blocks rendering calls when waiting for
                // a vertical retrace anyhow.
                long swapInterval = 1;
                CGLSetParameter(mCGLContext, kCGLCPSwapInterval, &swapInterval);
                
                // Give a copy of our context to the rendersystem
                mContext = new OSXCGLContext(mCGLContext);
                
                // Let everyone know we are fullscreen now
                mIsFullScreen = true;
                
                CGDisplayFade(reservationToken,
                  2.0,
                  kCGDisplayBlendSolidColor,
                  kCGDisplayBlendNormal,
                  0.0, 0.0, 0.0,
                  false);
                CGReleaseDisplayFadeReservation(reservationToken);
}

//-------------------------------------------------------------------------------------------------//
void OSXWindow::destroyCGLFullscreen(void)
{
        CGReleaseAllDisplays();
}

//-------------------------------------------------------------------------------------------------//
void OSXWindow::swapCGLBuffers(void)
{
        CGLFlushDrawable(mCGLContext);
        CGLContextObj curCtx = CGLGetCurrentContext();
        if(curCtx != mCGLContext)
        {
                CGLSetCurrentContext(mCGLContext);
                CGLSetFullScreen(mCGLContext);
        }
}

}