michael@0: #include "precompiled.h"
michael@0: //
michael@0: // Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved.
michael@0: // Use of this source code is governed by a BSD-style license that can be
michael@0: // found in the LICENSE file.
michael@0: //
michael@0: 
michael@0: // Framebuffer.cpp: Implements the gl::Framebuffer class. Implements GL framebuffer
michael@0: // objects and related functionality. [OpenGL ES 2.0.24] section 4.4 page 105.
michael@0: 
michael@0: #include "libGLESv2/Framebuffer.h"
michael@0: 
michael@0: #include "libGLESv2/main.h"
michael@0: #include "libGLESv2/utilities.h"
michael@0: #include "libGLESv2/Texture.h"
michael@0: #include "libGLESv2/Context.h"
michael@0: #include "libGLESv2/renderer/Renderer.h"
michael@0: #include "libGLESv2/Renderbuffer.h"
michael@0: 
michael@0: namespace gl
michael@0: {
michael@0: 
michael@0: Framebuffer::Framebuffer(rx::Renderer *renderer)
michael@0:     : mRenderer(renderer)
michael@0: {
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         mColorbufferTypes[colorAttachment] = GL_NONE;
michael@0:         mDrawBufferStates[colorAttachment] = GL_NONE;
michael@0:     }
michael@0:     mDrawBufferStates[0] = GL_COLOR_ATTACHMENT0_EXT;
michael@0:     mReadBufferState = GL_COLOR_ATTACHMENT0_EXT;
michael@0: 
michael@0:     mDepthbufferType = GL_NONE;
michael@0:     mStencilbufferType = GL_NONE;
michael@0: }
michael@0: 
michael@0: Framebuffer::~Framebuffer()
michael@0: {
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         mColorbufferPointers[colorAttachment].set(NULL);
michael@0:     }
michael@0:     mDepthbufferPointer.set(NULL);
michael@0:     mStencilbufferPointer.set(NULL);
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::lookupRenderbuffer(GLenum type, GLuint handle) const
michael@0: {
michael@0:     gl::Context *context = gl::getContext();
michael@0:     Renderbuffer *buffer = NULL;
michael@0: 
michael@0:     if (type == GL_NONE)
michael@0:     {
michael@0:         buffer = NULL;
michael@0:     }
michael@0:     else if (type == GL_RENDERBUFFER)
michael@0:     {
michael@0:         buffer = context->getRenderbuffer(handle);
michael@0:     }
michael@0:     else if (IsInternalTextureTarget(type))
michael@0:     {
michael@0:         buffer = context->getTexture(handle)->getRenderbuffer(type);
michael@0:     }
michael@0:     else
michael@0:     {
michael@0:         UNREACHABLE();
michael@0:     }
michael@0: 
michael@0:     return buffer;
michael@0: }
michael@0: 
michael@0: void Framebuffer::setColorbuffer(unsigned int colorAttachment, GLenum type, GLuint colorbuffer)
michael@0: {
michael@0:     ASSERT(colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS);
michael@0:     mColorbufferTypes[colorAttachment] = (colorbuffer != 0) ? type : GL_NONE;
michael@0:     mColorbufferPointers[colorAttachment].set(lookupRenderbuffer(type, colorbuffer));
michael@0: }
michael@0: 
michael@0: void Framebuffer::setDepthbuffer(GLenum type, GLuint depthbuffer)
michael@0: {
michael@0:     mDepthbufferType = (depthbuffer != 0) ? type : GL_NONE;
michael@0:     mDepthbufferPointer.set(lookupRenderbuffer(type, depthbuffer));
michael@0: }
michael@0: 
michael@0: void Framebuffer::setStencilbuffer(GLenum type, GLuint stencilbuffer)
michael@0: {
michael@0:     mStencilbufferType = (stencilbuffer != 0) ? type : GL_NONE;
michael@0:     mStencilbufferPointer.set(lookupRenderbuffer(type, stencilbuffer));
michael@0: }
michael@0: 
michael@0: void Framebuffer::detachTexture(GLuint texture)
michael@0: {
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         if (mColorbufferPointers[colorAttachment].id() == texture && IsInternalTextureTarget(mColorbufferTypes[colorAttachment]))
michael@0:         {
michael@0:             mColorbufferTypes[colorAttachment] = GL_NONE;
michael@0:             mColorbufferPointers[colorAttachment].set(NULL);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (mDepthbufferPointer.id() == texture && IsInternalTextureTarget(mDepthbufferType))
michael@0:     {
michael@0:         mDepthbufferType = GL_NONE;
michael@0:         mDepthbufferPointer.set(NULL);
michael@0:     }
michael@0: 
michael@0:     if (mStencilbufferPointer.id() == texture && IsInternalTextureTarget(mStencilbufferType))
michael@0:     {
michael@0:         mStencilbufferType = GL_NONE;
michael@0:         mStencilbufferPointer.set(NULL);
michael@0:     }
michael@0: }
michael@0: 
michael@0: void Framebuffer::detachRenderbuffer(GLuint renderbuffer)
michael@0: {
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         if (mColorbufferPointers[colorAttachment].id() == renderbuffer && mColorbufferTypes[colorAttachment] == GL_RENDERBUFFER)
michael@0:         {
michael@0:             mColorbufferTypes[colorAttachment] = GL_NONE;
michael@0:             mColorbufferPointers[colorAttachment].set(NULL);
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (mDepthbufferPointer.id() == renderbuffer && mDepthbufferType == GL_RENDERBUFFER)
michael@0:     {
michael@0:         mDepthbufferType = GL_NONE;
michael@0:         mDepthbufferPointer.set(NULL);
michael@0:     }
michael@0: 
michael@0:     if (mStencilbufferPointer.id() == renderbuffer && mStencilbufferType == GL_RENDERBUFFER)
michael@0:     {
michael@0:         mStencilbufferType = GL_NONE;
michael@0:         mStencilbufferPointer.set(NULL);
michael@0:     }
michael@0: }
michael@0: 
michael@0: unsigned int Framebuffer::getRenderTargetSerial(unsigned int colorAttachment) const
michael@0: {
michael@0:     ASSERT(colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS);
michael@0: 
michael@0:     Renderbuffer *colorbuffer = mColorbufferPointers[colorAttachment].get();
michael@0: 
michael@0:     if (colorbuffer)
michael@0:     {
michael@0:         return colorbuffer->getSerial();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: unsigned int Framebuffer::getDepthbufferSerial() const
michael@0: {
michael@0:     Renderbuffer *depthbuffer = mDepthbufferPointer.get();
michael@0: 
michael@0:     if (depthbuffer)
michael@0:     {
michael@0:         return depthbuffer->getSerial();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: unsigned int Framebuffer::getStencilbufferSerial() const
michael@0: {
michael@0:     Renderbuffer *stencilbuffer = mStencilbufferPointer.get();
michael@0: 
michael@0:     if (stencilbuffer)
michael@0:     {
michael@0:         return stencilbuffer->getSerial();
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::getColorbuffer(unsigned int colorAttachment) const
michael@0: {
michael@0:     ASSERT(colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS);
michael@0:     return mColorbufferPointers[colorAttachment].get();
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::getDepthbuffer() const
michael@0: {
michael@0:     return mDepthbufferPointer.get();
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::getStencilbuffer() const
michael@0: {
michael@0:     return mStencilbufferPointer.get();
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::getDepthOrStencilbuffer() const
michael@0: {
michael@0:     Renderbuffer *depthstencilbuffer = mDepthbufferPointer.get();
michael@0:     
michael@0:     if (!depthstencilbuffer)
michael@0:     {
michael@0:         depthstencilbuffer = mStencilbufferPointer.get();
michael@0:     }
michael@0: 
michael@0:     return depthstencilbuffer;
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::getReadColorbuffer() const
michael@0: {
michael@0:     // Will require more logic if glReadBuffers is supported
michael@0:     return mColorbufferPointers[0].get();
michael@0: }
michael@0: 
michael@0: GLenum Framebuffer::getReadColorbufferType() const
michael@0: {
michael@0:     // Will require more logic if glReadBuffers is supported
michael@0:     return mColorbufferTypes[0];
michael@0: }
michael@0: 
michael@0: Renderbuffer *Framebuffer::getFirstColorbuffer() const
michael@0: {
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         if (mColorbufferTypes[colorAttachment] != GL_NONE)
michael@0:         {
michael@0:             return mColorbufferPointers[colorAttachment].get();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return NULL;
michael@0: }
michael@0: 
michael@0: GLenum Framebuffer::getColorbufferType(unsigned int colorAttachment) const
michael@0: {
michael@0:     ASSERT(colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS);
michael@0:     return mColorbufferTypes[colorAttachment];
michael@0: }
michael@0: 
michael@0: GLenum Framebuffer::getDepthbufferType() const
michael@0: {
michael@0:     return mDepthbufferType;
michael@0: }
michael@0: 
michael@0: GLenum Framebuffer::getStencilbufferType() const
michael@0: {
michael@0:     return mStencilbufferType;
michael@0: }
michael@0: 
michael@0: GLuint Framebuffer::getColorbufferHandle(unsigned int colorAttachment) const
michael@0: {
michael@0:     ASSERT(colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS);
michael@0:     return mColorbufferPointers[colorAttachment].id();
michael@0: }
michael@0: 
michael@0: GLuint Framebuffer::getDepthbufferHandle() const
michael@0: {
michael@0:     return mDepthbufferPointer.id();
michael@0: }
michael@0: 
michael@0: GLuint Framebuffer::getStencilbufferHandle() const
michael@0: {
michael@0:     return mStencilbufferPointer.id();
michael@0: }
michael@0: 
michael@0: GLenum Framebuffer::getDrawBufferState(unsigned int colorAttachment) const
michael@0: {
michael@0:     return mDrawBufferStates[colorAttachment];
michael@0: }
michael@0: 
michael@0: void Framebuffer::setDrawBufferState(unsigned int colorAttachment, GLenum drawBuffer)
michael@0: {
michael@0:     mDrawBufferStates[colorAttachment] = drawBuffer;
michael@0: }
michael@0: 
michael@0: bool Framebuffer::isEnabledColorAttachment(unsigned int colorAttachment) const
michael@0: {
michael@0:     return (mColorbufferTypes[colorAttachment] != GL_NONE && mDrawBufferStates[colorAttachment] != GL_NONE);
michael@0: }
michael@0: 
michael@0: bool Framebuffer::hasEnabledColorAttachment() const
michael@0: {
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < gl::IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         if (isEnabledColorAttachment(colorAttachment))
michael@0:         {
michael@0:             return true;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool Framebuffer::hasStencil() const
michael@0: {
michael@0:     if (mStencilbufferType != GL_NONE)
michael@0:     {
michael@0:         const Renderbuffer *stencilbufferObject = getStencilbuffer();
michael@0: 
michael@0:         if (stencilbufferObject)
michael@0:         {
michael@0:             return stencilbufferObject->getStencilSize() > 0;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: bool Framebuffer::usingExtendedDrawBuffers() const
michael@0: {
michael@0:     for (unsigned int colorAttachment = 1; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         if (isEnabledColorAttachment(colorAttachment))
michael@0:         {
michael@0:             return true;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return false;
michael@0: }
michael@0: 
michael@0: GLenum Framebuffer::completeness() const
michael@0: {
michael@0:     int width = 0;
michael@0:     int height = 0;
michael@0:     int colorbufferSize = 0;
michael@0:     int samples = -1;
michael@0:     bool missingAttachment = true;
michael@0: 
michael@0:     for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:     {
michael@0:         if (mColorbufferTypes[colorAttachment] != GL_NONE)
michael@0:         {
michael@0:             const Renderbuffer *colorbuffer = getColorbuffer(colorAttachment);
michael@0: 
michael@0:             if (!colorbuffer)
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0: 
michael@0:             if (colorbuffer->getWidth() == 0 || colorbuffer->getHeight() == 0)
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0: 
michael@0:             if (mColorbufferTypes[colorAttachment] == GL_RENDERBUFFER)
michael@0:             {
michael@0:                 if (!gl::IsColorRenderable(colorbuffer->getInternalFormat()))
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:                 }
michael@0:             }
michael@0:             else if (IsInternalTextureTarget(mColorbufferTypes[colorAttachment]))
michael@0:             {
michael@0:                 GLint internalformat = colorbuffer->getInternalFormat();
michael@0:                 GLenum format = gl::ExtractFormat(internalformat);
michael@0: 
michael@0:                 if (IsCompressed(format) ||
michael@0:                     format == GL_ALPHA ||
michael@0:                     format == GL_LUMINANCE ||
michael@0:                     format == GL_LUMINANCE_ALPHA)
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_UNSUPPORTED;
michael@0:                 }
michael@0: 
michael@0:                 bool filtering, renderable;
michael@0: 
michael@0:                 if ((gl::IsFloat32Format(internalformat) && !mRenderer->getFloat32TextureSupport(&filtering, &renderable)) ||
michael@0:                     (gl::IsFloat16Format(internalformat) && !mRenderer->getFloat16TextureSupport(&filtering, &renderable)))
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_UNSUPPORTED;
michael@0:                 }
michael@0: 
michael@0:                 if (gl::IsDepthTexture(internalformat) || gl::IsStencilTexture(internalformat))
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:                 }
michael@0:             }
michael@0:             else
michael@0:             {
michael@0:                 UNREACHABLE();
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0: 
michael@0:             if (!missingAttachment)
michael@0:             {
michael@0:                 // all color attachments must have the same width and height
michael@0:                 if (colorbuffer->getWidth() != width || colorbuffer->getHeight() != height)
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
michael@0:                 }
michael@0: 
michael@0:                 // APPLE_framebuffer_multisample, which EXT_draw_buffers refers to, requires that
michael@0:                 // all color attachments have the same number of samples for the FBO to be complete.
michael@0:                 if (colorbuffer->getSamples() != samples)
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT;
michael@0:                 }
michael@0: 
michael@0:                 // all color attachments attachments must have the same number of bitplanes
michael@0:                 if (gl::ComputePixelSize(colorbuffer->getInternalFormat()) != colorbufferSize)
michael@0:                 {
michael@0:                     return GL_FRAMEBUFFER_UNSUPPORTED;
michael@0:                 }
michael@0: 
michael@0:                 // D3D11 does not allow for overlapping RenderTargetViews, so ensure uniqueness
michael@0:                 for (unsigned int previousColorAttachment = 0; previousColorAttachment < colorAttachment; previousColorAttachment++)
michael@0:                 {
michael@0:                     if (mColorbufferPointers[colorAttachment].get() == mColorbufferPointers[previousColorAttachment].get())
michael@0:                     {
michael@0:                         return GL_FRAMEBUFFER_UNSUPPORTED;
michael@0:                     }
michael@0:                 }
michael@0:             }
michael@0:             else
michael@0:             {
michael@0:                 width = colorbuffer->getWidth();
michael@0:                 height = colorbuffer->getHeight();
michael@0:                 samples = colorbuffer->getSamples();
michael@0:                 colorbufferSize = gl::ComputePixelSize(colorbuffer->getInternalFormat());
michael@0:                 missingAttachment = false;
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     const Renderbuffer *depthbuffer = NULL;
michael@0:     const Renderbuffer *stencilbuffer = NULL;
michael@0: 
michael@0:     if (mDepthbufferType != GL_NONE)
michael@0:     {
michael@0:         depthbuffer = getDepthbuffer();
michael@0: 
michael@0:         if (!depthbuffer)
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:         }
michael@0: 
michael@0:         if (depthbuffer->getWidth() == 0 || depthbuffer->getHeight() == 0)
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:         }
michael@0: 
michael@0:         if (mDepthbufferType == GL_RENDERBUFFER)
michael@0:         {
michael@0:             if (!gl::IsDepthRenderable(depthbuffer->getInternalFormat()))
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0:         }
michael@0:         else if (IsInternalTextureTarget(mDepthbufferType))
michael@0:         {
michael@0:             GLint internalformat = depthbuffer->getInternalFormat();
michael@0: 
michael@0:             // depth texture attachments require OES/ANGLE_depth_texture
michael@0:             if (!mRenderer->getDepthTextureSupport())
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0: 
michael@0:             if (!gl::IsDepthTexture(internalformat))
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0:         }
michael@0:         else
michael@0:         {
michael@0:             UNREACHABLE();
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:         }
michael@0: 
michael@0:         if (missingAttachment)
michael@0:         {
michael@0:             width = depthbuffer->getWidth();
michael@0:             height = depthbuffer->getHeight();
michael@0:             samples = depthbuffer->getSamples();
michael@0:             missingAttachment = false;
michael@0:         }
michael@0:         else if (width != depthbuffer->getWidth() || height != depthbuffer->getHeight())
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
michael@0:         }
michael@0:         else if (samples != depthbuffer->getSamples())
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_ANGLE;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     if (mStencilbufferType != GL_NONE)
michael@0:     {
michael@0:         stencilbuffer = getStencilbuffer();
michael@0: 
michael@0:         if (!stencilbuffer)
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:         }
michael@0: 
michael@0:         if (stencilbuffer->getWidth() == 0 || stencilbuffer->getHeight() == 0)
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:         }
michael@0: 
michael@0:         if (mStencilbufferType == GL_RENDERBUFFER)
michael@0:         {
michael@0:             if (!gl::IsStencilRenderable(stencilbuffer->getInternalFormat()))
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0:         }
michael@0:         else if (IsInternalTextureTarget(mStencilbufferType))
michael@0:         {
michael@0:             GLint internalformat = stencilbuffer->getInternalFormat();
michael@0: 
michael@0:             // texture stencil attachments come along as part
michael@0:             // of OES_packed_depth_stencil + OES/ANGLE_depth_texture
michael@0:             if (!mRenderer->getDepthTextureSupport())
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0: 
michael@0:             if (!gl::IsStencilTexture(internalformat))
michael@0:             {
michael@0:                 return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:             }
michael@0:         }
michael@0:         else
michael@0:         {
michael@0:             UNREACHABLE();
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT;
michael@0:         }
michael@0: 
michael@0:         if (missingAttachment)
michael@0:         {
michael@0:             width = stencilbuffer->getWidth();
michael@0:             height = stencilbuffer->getHeight();
michael@0:             samples = stencilbuffer->getSamples();
michael@0:             missingAttachment = false;
michael@0:         }
michael@0:         else if (width != stencilbuffer->getWidth() || height != stencilbuffer->getHeight())
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS;
michael@0:         }
michael@0:         else if (samples != stencilbuffer->getSamples())
michael@0:         {
michael@0:             return GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_ANGLE;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     // if we have both a depth and stencil buffer, they must refer to the same object
michael@0:     // since we only support packed_depth_stencil and not separate depth and stencil
michael@0:     if (depthbuffer && stencilbuffer && (depthbuffer != stencilbuffer))
michael@0:     {
michael@0:         return GL_FRAMEBUFFER_UNSUPPORTED;
michael@0:     }
michael@0: 
michael@0:     // we need to have at least one attachment to be complete
michael@0:     if (missingAttachment)
michael@0:     {
michael@0:         return GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT;
michael@0:     }
michael@0: 
michael@0:     return GL_FRAMEBUFFER_COMPLETE;
michael@0: }
michael@0: 
michael@0: DefaultFramebuffer::DefaultFramebuffer(rx::Renderer *renderer, Colorbuffer *colorbuffer, DepthStencilbuffer *depthStencil)
michael@0:     : Framebuffer(renderer)
michael@0: {
michael@0:     mColorbufferPointers[0].set(new Renderbuffer(mRenderer, 0, colorbuffer));
michael@0: 
michael@0:     Renderbuffer *depthStencilRenderbuffer = new Renderbuffer(mRenderer, 0, depthStencil);
michael@0:     mDepthbufferPointer.set(depthStencilRenderbuffer);
michael@0:     mStencilbufferPointer.set(depthStencilRenderbuffer);
michael@0: 
michael@0:     mColorbufferTypes[0] = GL_RENDERBUFFER;
michael@0:     mDepthbufferType = (depthStencilRenderbuffer->getDepthSize() != 0) ? GL_RENDERBUFFER : GL_NONE;
michael@0:     mStencilbufferType = (depthStencilRenderbuffer->getStencilSize() != 0) ? GL_RENDERBUFFER : GL_NONE;
michael@0: 
michael@0:     mDrawBufferStates[0] = GL_BACK;
michael@0:     mReadBufferState = GL_BACK;
michael@0: }
michael@0: 
michael@0: int Framebuffer::getSamples() const
michael@0: {
michael@0:     if (completeness() == GL_FRAMEBUFFER_COMPLETE)
michael@0:     {
michael@0:         // for a complete framebuffer, all attachments must have the same sample count
michael@0:         // in this case return the first nonzero sample size
michael@0:         for (unsigned int colorAttachment = 0; colorAttachment < IMPLEMENTATION_MAX_DRAW_BUFFERS; colorAttachment++)
michael@0:         {
michael@0:             if (mColorbufferTypes[colorAttachment] != GL_NONE)
michael@0:             {
michael@0:                 return getColorbuffer(colorAttachment)->getSamples();
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: GLenum DefaultFramebuffer::completeness() const
michael@0: {
michael@0:     // The default framebuffer *must* always be complete, though it may not be
michael@0:     // subject to the same rules as application FBOs. ie, it could have 0x0 size.
michael@0:     return GL_FRAMEBUFFER_COMPLETE;
michael@0: }
michael@0: 
michael@0: }