[692] | 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) 2000-2005 The OGRE Team
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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 | */
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| 25 |
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| 26 | #include "OgreGLFBORenderTexture.h"
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| 27 | #include "OgreGLPixelFormat.h"
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| 28 | #include "OgreLogManager.h"
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| 29 | #include "OgreStringConverter.h"
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| 30 | #include "OgreRoot.h"
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| 31 | #include "OgreGLHardwarePixelBuffer.h"
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| 32 | #include "OgreGLFBOMultiRenderTarget.h"
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| 33 |
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| 34 | namespace Ogre {
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| 35 |
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| 36 | //-----------------------------------------------------------------------------
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| 37 | GLFBORenderTexture::GLFBORenderTexture(GLFBOManager *manager, const String &name,
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| 38 | const GLSurfaceDesc &target):
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| 39 | GLRenderTexture(name, target),
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| 40 | mFB(manager)
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| 41 | {
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| 42 | // Bind target to surface 0 and initialise
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| 43 | mFB.bindSurface(0, target);
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| 44 | // Get attributes
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| 45 | mWidth = mFB.getWidth();
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| 46 | mHeight = mFB.getHeight();
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| 47 | }
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| 48 |
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| 49 | void GLFBORenderTexture::getCustomAttribute(const String& name, void* pData)
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| 50 | {
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| 51 | if(name=="FBO")
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| 52 | {
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| 53 | *static_cast<GLFrameBufferObject **>(pData) = &mFB;
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| 54 | }
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| 55 | }
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| 56 |
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| 57 | /// Size of probe texture
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| 58 | #define PROBE_SIZE 256
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| 59 | /// Stencil and depth formats to be tried
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| 60 | GLenum stencilFormats[]={
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| 61 | GL_NONE, // No stencil
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| 62 | GL_STENCIL_INDEX1_EXT,
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| 63 | GL_STENCIL_INDEX4_EXT,
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| 64 | GL_STENCIL_INDEX8_EXT,
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| 65 | GL_STENCIL_INDEX16_EXT
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| 66 | };
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| 67 | size_t stencilBits[] = {
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| 68 | 0, 1, 4, 8, 16
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| 69 | };
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| 70 | #define STENCILFORMAT_COUNT (sizeof(stencilFormats)/sizeof(GLenum))
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| 71 | GLenum depthFormats[]={
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| 72 | GL_NONE,
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| 73 | GL_DEPTH_COMPONENT16,
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| 74 | GL_DEPTH_COMPONENT24, // Prefer 24 bit depth
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| 75 | GL_DEPTH_COMPONENT32,
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| 76 | GL_DEPTH24_STENCIL8_EXT // packed depth / stencil
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| 77 | };
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| 78 | size_t depthBits[] = {
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| 79 | 0,16,24,32,24
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| 80 | };
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| 81 |
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| 82 |
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| 83 | #define DEPTHFORMAT_COUNT (sizeof(depthFormats)/sizeof(GLenum))
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| 84 |
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| 85 | GLFBOManager::GLFBOManager(bool atimode):
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| 86 | mATIMode(atimode)
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| 87 | {
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| 88 | detectFBOFormats();
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| 89 |
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| 90 | glGenFramebuffersEXT(1, &mTempFBO);
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| 91 | }
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| 92 |
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| 93 | GLFBOManager::~GLFBOManager()
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| 94 | {
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| 95 | if(!mRenderBufferMap.empty())
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| 96 | {
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| 97 | LogManager::getSingleton().logMessage("GL: Warning! GLFBOManager destructor called, but not all renderbuffers were released.");
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| 98 | }
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| 99 |
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| 100 | glDeleteFramebuffersEXT(1, &mTempFBO);
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| 101 | }
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| 102 |
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| 103 | /** Try a certain FBO format, and return the status. Also sets mDepthRB and mStencilRB.
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| 104 | @returns true if this combo is supported
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| 105 | false if this combo is not supported
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| 106 | */
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| 107 | GLuint GLFBOManager::_tryFormat(GLenum depthFormat, GLenum stencilFormat)
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| 108 | {
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| 109 | GLuint status, depthRB, stencilRB;
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| 110 | bool failed = false; // flag on GL errors
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| 111 |
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| 112 | if(depthFormat != GL_NONE)
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| 113 | {
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| 114 | /// Generate depth renderbuffer
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| 115 | glGenRenderbuffersEXT(1, &depthRB);
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| 116 | /// Bind it to FBO
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| 117 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, depthRB);
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| 118 |
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| 119 | /// Allocate storage for depth buffer
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| 120 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, depthFormat,
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| 121 | PROBE_SIZE, PROBE_SIZE);
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| 122 |
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| 123 | /// Attach depth
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| 124 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
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| 125 | GL_RENDERBUFFER_EXT, depthRB);
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| 126 | }
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| 127 |
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| 128 | if(stencilFormat != GL_NONE)
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| 129 | {
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| 130 | /// Generate stencil renderbuffer
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| 131 | glGenRenderbuffersEXT(1, &stencilRB);
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| 132 | /// Bind it to FBO
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| 133 | glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, stencilRB);
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| 134 | glGetError(); // NV hack
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| 135 | /// Allocate storage for stencil buffer
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| 136 | glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, stencilFormat,
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| 137 | PROBE_SIZE, PROBE_SIZE);
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| 138 | if(glGetError() != GL_NO_ERROR) // NV hack
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| 139 | failed = true;
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| 140 | /// Attach stencil
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| 141 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
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| 142 | GL_RENDERBUFFER_EXT, stencilRB);
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| 143 | if(glGetError() != GL_NO_ERROR) // NV hack
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| 144 | failed = true;
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| 145 | }
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| 146 |
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| 147 | status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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| 148 | /// If status is negative, clean up
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| 149 | // Detach and destroy
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| 150 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_NONE, 0);
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| 151 | glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_NONE, 0);
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| 152 | glDeleteRenderbuffersEXT(1, &depthRB);
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| 153 | glDeleteRenderbuffersEXT(1, &stencilRB);
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| 154 |
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| 155 | return status == GL_FRAMEBUFFER_COMPLETE_EXT && !failed;
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| 156 | }
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| 157 |
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| 158 | /** Detect which internal formats are allowed as RTT
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| 159 | Also detect what combinations of stencil and depth are allowed with this internal
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| 160 | format.
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| 161 | */
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| 162 | void GLFBOManager::detectFBOFormats()
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| 163 | {
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| 164 | // Try all formats, and report which ones work as target
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| 165 | GLuint fb, tid;
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| 166 | GLenum target = GL_TEXTURE_2D;
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| 167 |
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| 168 | for(size_t x=0; x<PF_COUNT; ++x)
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| 169 | {
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| 170 | mProps[x].valid = false;
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| 171 |
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| 172 | // Fetch GL format token
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| 173 | GLenum fmt = GLPixelUtil::getGLInternalFormat((PixelFormat)x);
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| 174 | if(fmt == GL_NONE && x!=0)
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| 175 | continue;
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| 176 |
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| 177 | // No test for compressed formats
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| 178 | if(PixelUtil::isCompressed((PixelFormat)x))
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| 179 | continue;
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| 180 |
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| 181 | // Buggy ATI cards *crash* on non-RGB(A) formats
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| 182 | int depths[4];
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| 183 | PixelUtil::getBitDepths((PixelFormat)x, depths);
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| 184 | if(fmt!=GL_NONE && mATIMode && (!depths[0] || !depths[1] || !depths[2]))
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| 185 | continue;
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| 186 |
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| 187 | // Create and attach framebuffer
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| 188 | glGenFramebuffersEXT(1, &fb);
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| 189 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
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| 190 | if(fmt!=GL_NONE)
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| 191 | {
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| 192 | // Create and attach texture
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| 193 | glGenTextures(1, &tid);
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| 194 | glBindTexture(target, tid);
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| 195 |
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| 196 | // Set some default parameters so it won't fail on NVidia cards
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| 197 | glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, 0);
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| 198 | glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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| 199 | glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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| 200 | glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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| 201 | glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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| 202 |
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| 203 | glTexImage2D(target, 0, fmt, PROBE_SIZE, PROBE_SIZE, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
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| 204 | glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
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| 205 | target, tid, 0);
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| 206 | }
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| 207 | else
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| 208 | {
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| 209 | // Draw to nowhere -- stencil/depth only
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| 210 | tid = 0;
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| 211 | glDrawBuffer(GL_NONE);
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| 212 | glReadBuffer(GL_NONE);
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| 213 | }
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| 214 | // Check status
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| 215 | GLuint status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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| 216 |
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| 217 | // Ignore status in case of fmt==GL_NONE, because no implementation will accept
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| 218 | // a buffer without *any* attachment. Buffers with only stencil and depth attachment
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| 219 | // might still be supported, so we must continue probing.
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| 220 | if(fmt == GL_NONE || status == GL_FRAMEBUFFER_COMPLETE_EXT)
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| 221 | {
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| 222 | mProps[x].valid = true;
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| 223 | StringUtil::StrStreamType str;
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| 224 | str << "FBO " << PixelUtil::getFormatName((PixelFormat)x)
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| 225 | << " depth/stencil support: ";
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| 226 |
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| 227 | // Continue detection
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| 228 | size_t depth=0, stencil=0;
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| 229 |
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| 230 | while(true)
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| 231 | {
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| 232 | //StringUtil::StrStreamType l;
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| 233 | //l << "Trying " << PixelUtil::getFormatName((PixelFormat)x)
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| 234 | // << " D" << depthBits[depth]
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| 235 | // << "S" << stencilBits[stencil];
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| 236 | //LogManager::getSingleton().logMessage(l.str());
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| 237 |
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| 238 | // Only query packed depth/stencil formats for 32-bit
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| 239 | // non-floating point formats (ie not R32!)
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| 240 | // Linux nVidia driver segfaults if you query others
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| 241 | if((depthFormats[depth] != GL_DEPTH24_STENCIL8_EXT ||
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| 242 | (PixelUtil::getNumElemBits((PixelFormat)x) == 32) &&
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| 243 | !PixelUtil::isFloatingPoint((PixelFormat)x)) &&
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| 244 | _tryFormat(depthFormats[depth], stencilFormats[stencil]))
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| 245 | {
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| 246 | /// Add mode to allowed modes
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| 247 | str << "D" << depthBits[depth] << "S" <<
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| 248 | (depthFormats[depth] == GL_DEPTH24_STENCIL8_EXT ? 8 : stencilBits[stencil])
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| 249 | << " ";
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| 250 | FormatProperties::Mode mode;
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| 251 | mode.depth = depth;
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| 252 | mode.stencil = stencil;
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| 253 | mProps[x].modes.push_back(mode);
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| 254 | }
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| 255 | /// Try next combo
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| 256 | stencil++;
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| 257 | if(stencil == STENCILFORMAT_COUNT)
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| 258 | {
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| 259 | stencil = 0;
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| 260 | depth ++;
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| 261 | if(depth == DEPTHFORMAT_COUNT)
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| 262 | {
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| 263 | // We're done
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| 264 | break;
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| 265 | }
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| 266 | }
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| 267 | }
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| 268 | LogManager::getSingleton().logMessage(str.str());
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| 269 |
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| 270 | }
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| 271 | // Delete texture and framebuffer
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| 272 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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| 273 | glDeleteFramebuffersEXT(1, &fb);
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| 274 | glDeleteTextures(1, &tid);
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| 275 | }
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| 276 |
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| 277 | std::string fmtstring;
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| 278 | for(size_t x=0; x<PF_COUNT; ++x)
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| 279 | {
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| 280 | if(mProps[x].valid)
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| 281 | fmtstring += PixelUtil::getFormatName((PixelFormat)x)+" ";
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| 282 | }
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| 283 | LogManager::getSingleton().logMessage("[GL] : Valid FBO targets " + fmtstring);
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| 284 | }
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| 285 | void GLFBOManager::getBestDepthStencil(GLenum internalFormat, GLenum *depthFormat, GLenum *stencilFormat)
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| 286 | {
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| 287 | const FormatProperties &props = mProps[internalFormat];
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| 288 | /// Decide what stencil and depth formats to use
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| 289 | /// [best supported for internal format]
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| 290 | size_t bestmode=0;
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| 291 | int bestscore=-1;
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| 292 | for(size_t mode=0; mode<props.modes.size(); mode++)
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| 293 | {
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| 294 | #if 0
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| 295 | /// Always prefer D24S8
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| 296 | if(stencilBits[props.modes[mode].stencil]==8 &&
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| 297 | depthBits[props.modes[mode].depth]==24)
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| 298 | {
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| 299 | bestmode = mode;
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| 300 | break;
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| 301 | }
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| 302 | #endif
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| 303 | int desirability = 0;
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| 304 | /// Find most desirable mode
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| 305 | /// desirability == 0 if no depth, no stencil
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| 306 | /// desirability == 1000...2000 if no depth, stencil
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| 307 | /// desirability == 2000...3000 if depth, no stencil
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| 308 | /// desirability == 3000+ if depth and stencil
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| 309 | /// beyond this, the total numer of bits (stencil+depth) is maximised
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| 310 | if(props.modes[mode].stencil)
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| 311 | desirability += 1000;
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| 312 | if(props.modes[mode].depth)
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| 313 | desirability += 2000;
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| 314 | if(depthBits[props.modes[mode].depth]==24) // Prefer 24 bit for now
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| 315 | desirability += 500;
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| 316 | if(depthFormats[props.modes[mode].depth]==GL_DEPTH24_STENCIL8_EXT) // Prefer 24/8 packed
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| 317 | desirability += 5000;
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| 318 | desirability += stencilBits[props.modes[mode].stencil] + depthBits[props.modes[mode].depth];
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| 319 |
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| 320 | if(desirability>bestscore)
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| 321 | {
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| 322 | bestscore = desirability;
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| 323 | bestmode = mode;
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| 324 | }
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| 325 | }
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| 326 | *depthFormat = depthFormats[props.modes[bestmode].depth];
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| 327 | *stencilFormat = stencilFormats[props.modes[bestmode].stencil];
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| 328 | }
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| 329 |
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| 330 | GLFBORenderTexture *GLFBOManager::createRenderTexture(const String &name, const GLSurfaceDesc &target)
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| 331 | {
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| 332 | GLFBORenderTexture *retval = new GLFBORenderTexture(this, name, target);
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| 333 | return retval;
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| 334 | }
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| 335 | MultiRenderTarget *GLFBOManager::createMultiRenderTarget(const String & name)
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| 336 | {
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| 337 | return new GLFBOMultiRenderTarget(this, name);
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| 338 | }
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| 339 |
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| 340 | GLFrameBufferObject *GLFBOManager::createFrameBufferObject()
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| 341 | {
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| 342 | return new GLFrameBufferObject(this);
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| 343 | }
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| 344 |
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| 345 | void GLFBOManager::destroyFrameBufferObject(GLFrameBufferObject * x)
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| 346 | {
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| 347 | delete x;
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| 348 | }
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| 349 | void GLFBOManager::bind(RenderTarget *target)
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| 350 | {
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| 351 | /// Check if the render target is in the rendertarget->FBO map
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| 352 | GLFrameBufferObject *fbo = 0;
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| 353 | target->getCustomAttribute("FBO", &fbo);
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| 354 | if(fbo)
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| 355 | fbo->bind();
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| 356 | else
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| 357 | // Old style context (window/pbuffer) or copying render texture
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| 358 | glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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| 359 | }
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| 360 |
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| 361 | GLSurfaceDesc GLFBOManager::requestRenderBuffer(GLenum format, size_t width, size_t height)
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| 362 | {
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| 363 | GLSurfaceDesc retval;
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| 364 | retval.buffer = 0; // Return 0 buffer if GL_NONE is requested
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| 365 | if(format != GL_NONE)
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| 366 | {
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| 367 | RBFormat key(format, width, height);
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| 368 | RenderBufferMap::iterator it = mRenderBufferMap.find(key);
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| 369 | if(it != mRenderBufferMap.end())
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| 370 | {
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| 371 | retval.buffer = it->second.buffer;
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| 372 | retval.zoffset = 0;
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| 373 | // Increase refcount
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| 374 | ++it->second.refcount;
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| 375 | }
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| 376 | else
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| 377 | {
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| 378 | // New one
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| 379 | GLRenderBuffer *rb = new GLRenderBuffer(format, width, height);
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| 380 | mRenderBufferMap[key] = RBRef(rb);
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| 381 | retval.buffer = rb;
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| 382 | retval.zoffset = 0;
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| 383 | }
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| 384 | }
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| 385 | //std::cerr << "Requested renderbuffer with format " << std::hex << format << std::dec << " of " << width << "x" << height << " :" << retval.buffer << std::endl;
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| 386 | return retval;
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| 387 | }
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| 388 | void GLFBOManager::releaseRenderBuffer(const GLSurfaceDesc &surface)
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| 389 | {
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| 390 | if(surface.buffer == 0)
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| 391 | return;
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| 392 | RBFormat key(surface.buffer->getGLFormat(), surface.buffer->getWidth(), surface.buffer->getHeight());
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| 393 | RenderBufferMap::iterator it = mRenderBufferMap.find(key);
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| 394 | if(it != mRenderBufferMap.end())
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| 395 | {
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| 396 | // Decrease refcount
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| 397 | --it->second.refcount;
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| 398 | if(it->second.refcount==0)
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| 399 | {
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| 400 | // If refcount reaches zero, delete buffer and remove from map
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| 401 | delete it->second.buffer;
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| 402 | mRenderBufferMap.erase(it);
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| 403 | //std::cerr << "Destroyed renderbuffer of format " << std::hex << key.format << std::dec
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| 404 | // << " of " << key.width << "x" << key.height << std::endl;
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| 405 | }
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| 406 | }
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| 407 | }
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| 408 | }
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