kc3-lang/angle/src/libANGLE/renderer/gl/BlitGL.h

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• Hash : 53b8aec0
  Author :
  Date : 2015-08-24T10:33:25
  

  Work around deprecated LUMA formats in the core profile.
  
  Use R and RG textures with swizzle states to emulate them. A manual blit is
  required when calling CopyTex[Sub]Image from a RGB[A] framebuffer to an
  emulated L[A] texture so that the alpha channel ends up in the correct channel
  of the destination texture.
  
  Fixes the following tests when using the core profile:
   * conformance/extensions/oes-texture-float.html
   * conformance/extensions/oes-texture-half-float.html
   * conformance/textures/misc/tex-sub-image-2d.html
   * conformance/textures/misc/texture-formats-test.html
   * conformance/textures/misc/texture-npot.html
  
  BUG=angleproject:1113
  
  Change-Id: If5540e66d9017596bd83d95ec3ede043cbcfe0d2
  Reviewed-on: https://chromium-review.googlesource.com/293905
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Tested-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/gl/BlitGL.h

• //
  // Copyright 2015 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  // BlitGL.h: Defines the BlitGL class, a helper for blitting textures
  
  #ifndef LIBANGLE_RENDERER_GL_BLITGL_H_
  #define LIBANGLE_RENDERER_GL_BLITGL_H_
  
  #include "angle_gl.h"
  #include "common/angleutils.h"
  #include "libANGLE/angletypes.h"
  #include "libANGLE/Error.h"
  
  namespace gl
  {
  class Framebuffer;
  }
  
  namespace rx
  {
  
  class FramebufferGL;
  class FunctionsGL;
  class StateManagerGL;
  struct WorkaroundsGL;
  
  class BlitGL : public angle::NonCopyable
  {
    public:
      BlitGL(const FunctionsGL *functions,
             const WorkaroundsGL &workarounds,
             StateManagerGL *stateManager);
      ~BlitGL();
  
      gl::Error copyImageToLUMAWorkaroundTexture(GLuint texture,
                                                 GLenum textureType,
                                                 GLenum target,
                                                 GLenum lumaFormat,
                                                 size_t level,
                                                 const gl::Rectangle &sourceArea,
                                                 GLenum internalFormat,
                                                 const gl::Framebuffer *source);
      gl::Error copySubImageToLUMAWorkaroundTexture(GLuint texture,
                                                    GLenum textureType,
                                                    GLenum target,
                                                    GLenum lumaFormat,
                                                    size_t level,
                                                    const gl::Offset &destOffset,
                                                    const gl::Rectangle &sourceArea,
                                                    const gl::Framebuffer *source);
  
      gl::Error initializeResources();
  
    private:
      const FunctionsGL *mFunctions;
      const WorkaroundsGL &mWorkarounds;
      StateManagerGL *mStateManager;
  
      GLuint mBlitProgram;
  
      GLuint mScratchTexture;
      GLuint mScratchFBO;
  
      GLuint mVAO;
  };
  }
  
  #endif  // LIBANGLE_RENDERER_GL_BLITGL_H_
  

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