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) 2000-2014 Torus Knot Software Ltd
8 
9   Permission is hereby granted, free of charge, to any person obtaining a copy
10   of this software and associated documentation files (the "Software"), to deal
11   in the Software without restriction, including without limitation the rights
12   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13   copies of the Software, and to permit persons to whom the Software is
14   furnished to do so, subject to the following conditions:
15 
16   The above copyright notice and this permission notice shall be included in
17   all copies or substantial portions of the Software.
18 
19   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25   THE SOFTWARE.
26   -----------------------------------------------------------------------------
27 */
28 
29 #include "OgreGLRenderTexture.h"
30 #include "OgreGLHardwarePixelBufferCommon.h"
31 #include "OgreGLRenderSystemCommon.h"
32 #include "OgreRoot.h"
33 
34 namespace Ogre {
35 
36     const String GLRenderTexture::CustomAttributeString_FBO = "FBO";
37     const String GLRenderTexture::CustomAttributeString_TARGET = "TARGET";
38     const String GLRenderTexture::CustomAttributeString_GLCONTEXT = "GLCONTEXT";
39 
40     template<> GLRTTManager* Singleton<GLRTTManager>::msSingleton = NULL;
41 
GLFrameBufferObjectCommon(int32 fsaa)42     GLFrameBufferObjectCommon::GLFrameBufferObjectCommon(int32 fsaa)
43         : mFB(0), mMultisampleFB(0), mNumSamples(fsaa)
44     {
45         auto* rs = static_cast<GLRenderSystemCommon*>(
46             Root::getSingleton().getRenderSystem());
47         mContext = rs->_getCurrentContext();
48 
49         // Initialise state
50         mDepth.buffer = 0;
51         mStencil.buffer = 0;
52         for(size_t x = 0; x < OGRE_MAX_MULTIPLE_RENDER_TARGETS; ++x)
53         {
54             mColour[x].buffer=0;
55         }
56     }
57 
bindSurface(size_t attachment,const GLSurfaceDesc & target)58     void GLFrameBufferObjectCommon::bindSurface(size_t attachment, const GLSurfaceDesc &target)
59     {
60         assert(attachment < OGRE_MAX_MULTIPLE_RENDER_TARGETS);
61         mColour[attachment] = target;
62         // Re-initialise
63         if(mColour[0].buffer)
64             initialise();
65     }
66 
unbindSurface(size_t attachment)67     void GLFrameBufferObjectCommon::unbindSurface(size_t attachment)
68     {
69         assert(attachment < OGRE_MAX_MULTIPLE_RENDER_TARGETS);
70         mColour[attachment].buffer = 0;
71         // Re-initialise if buffer 0 still bound
72         if(mColour[0].buffer)
73             initialise();
74     }
75 
getWidth() const76     uint32 GLFrameBufferObjectCommon::getWidth() const
77     {
78         assert(mColour[0].buffer);
79         return mColour[0].buffer->getWidth();
80     }
getHeight() const81     uint32 GLFrameBufferObjectCommon::getHeight() const
82     {
83         assert(mColour[0].buffer);
84         return mColour[0].buffer->getHeight();
85     }
getFormat() const86     PixelFormat GLFrameBufferObjectCommon::getFormat() const
87     {
88         assert(mColour[0].buffer);
89         return mColour[0].buffer->getFormat();
90     }
91 
getSingletonPtr(void)92     GLRTTManager* GLRTTManager::getSingletonPtr(void)
93     {
94         return msSingleton;
95     }
getSingleton(void)96     GLRTTManager& GLRTTManager::getSingleton(void)
97     {
98         assert( msSingleton );  return ( *msSingleton );
99     }
100 
GLRTTManager()101     GLRTTManager::GLRTTManager() {}
102     // need to implement in cpp due to how Ogre::Singleton works
~GLRTTManager()103     GLRTTManager::~GLRTTManager() {}
104 
createMultiRenderTarget(const String & name)105     MultiRenderTarget* GLRTTManager::createMultiRenderTarget(const String & name)
106     {
107         // TODO: Check rendersystem capabilities before throwing the exception
108         OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED,
109                     "MultiRenderTarget is not supported",
110                     "GLRTTManager::createMultiRenderTarget");
111     }
112 
getSupportedAlternative(PixelFormat format)113     PixelFormat GLRTTManager::getSupportedAlternative(PixelFormat format)
114     {
115         if (checkFormat(format))
116         {
117             return format;
118         }
119 
120         /// Find first alternative
121         PixelComponentType pct = PixelUtil::getComponentType(format);
122 
123         switch (pct)
124         {
125         case PCT_BYTE:
126             format = PF_BYTE_RGBA; // native endian
127             break;
128         case PCT_SHORT:
129             format = PF_SHORT_RGBA;
130             break;
131         case PCT_FLOAT16:
132             format = PF_FLOAT16_RGBA;
133             break;
134         case PCT_FLOAT32:
135             format = PF_FLOAT32_RGBA;
136             break;
137         case PCT_COUNT:
138         default:
139             break;
140         }
141 
142         if (checkFormat(format))
143             return format;
144 
145         /// If none at all, return to default
146         return PF_BYTE_RGBA; // native endian
147     }
148 
releaseRenderBuffer(const GLSurfaceDesc & surface)149     void GLRTTManager::releaseRenderBuffer(const GLSurfaceDesc &surface)
150     {
151         if(surface.buffer == 0)
152             return;
153         RBFormat key(surface.buffer->getGLFormat(), surface.buffer->getWidth(), surface.buffer->getHeight(), surface.numSamples);
154         RenderBufferMap::iterator it = mRenderBufferMap.find(key);
155         if(it != mRenderBufferMap.end())
156         {
157             // Decrease refcount
158             --it->second.refcount;
159             if(it->second.refcount==0)
160             {
161                 // If refcount reaches zero, delete buffer and remove from map
162                 delete it->second.buffer;
163                 mRenderBufferMap.erase(it);
164                 //                              std::cerr << "Destroyed renderbuffer of format " << std::hex << key.format << std::dec
165                 //                                      << " of " << key.width << "x" << key.height << std::endl;
166             }
167         }
168     }
169 
GLRenderTexture(const String & name,const GLSurfaceDesc & target,bool writeGamma,uint fsaa)170     GLRenderTexture::GLRenderTexture(const String &name,
171                                                const GLSurfaceDesc &target,
172                                                bool writeGamma,
173                                                uint fsaa)
174         : RenderTexture(target.buffer, target.zoffset)
175     {
176         mName = name;
177         mHwGamma = writeGamma;
178         mFSAA = fsaa;
179     }
180 }
181