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

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• Hash : b3eeb2a4
  Author :
  Date : 2019-08-05T17:02:43
  

  Emulate RGB textures using BGRX IOSurfaces.
  
  When the user requests an IOSurface Pbuffer with an RGB format, emulate the
  missing alpha channel by clearing it to 1.0 and masking reads and writes in
  shaders.
  
  BUG=angleproject:3766
  
  Change-Id: I58c992bf641d9ece0f923603f32640615150e4f3
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1737437
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Kenneth Russell <kbr@chromium.org>
  

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• src/libANGLE/renderer/gl/FramebufferGL.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.
  //
  
  // FramebufferGL.h: Defines the class interface for FramebufferGL.
  
  #ifndef LIBANGLE_RENDERER_GL_FRAMEBUFFERGL_H_
  #define LIBANGLE_RENDERER_GL_FRAMEBUFFERGL_H_
  
  #include "libANGLE/Context.h"
  #include "libANGLE/renderer/FramebufferImpl.h"
  
  namespace rx
  {
  
  class BlitGL;
  class ClearMultiviewGL;
  class FunctionsGL;
  class StateManagerGL;
  
  class FramebufferGL : public FramebufferImpl
  {
    public:
      FramebufferGL(const gl::FramebufferState &data, GLuint id, bool isDefault, bool emulatedAlpha);
      ~FramebufferGL() override;
  
      void destroy(const gl::Context *context) override;
  
      angle::Result discard(const gl::Context *context,
                            size_t count,
                            const GLenum *attachments) override;
      angle::Result invalidate(const gl::Context *context,
                               size_t count,
                               const GLenum *attachments) override;
      angle::Result invalidateSub(const gl::Context *context,
                                  size_t count,
                                  const GLenum *attachments,
                                  const gl::Rectangle &area) override;
  
      angle::Result clear(const gl::Context *context, GLbitfield mask) override;
      angle::Result clearBufferfv(const gl::Context *context,
                                  GLenum buffer,
                                  GLint drawbuffer,
                                  const GLfloat *values) override;
      angle::Result clearBufferuiv(const gl::Context *context,
                                   GLenum buffer,
                                   GLint drawbuffer,
                                   const GLuint *values) override;
      angle::Result clearBufferiv(const gl::Context *context,
                                  GLenum buffer,
                                  GLint drawbuffer,
                                  const GLint *values) override;
      angle::Result clearBufferfi(const gl::Context *context,
                                  GLenum buffer,
                                  GLint drawbuffer,
                                  GLfloat depth,
                                  GLint stencil) override;
  
      GLenum getImplementationColorReadFormat(const gl::Context *context) const override;
      GLenum getImplementationColorReadType(const gl::Context *context) const override;
  
      angle::Result readPixels(const gl::Context *context,
                               const gl::Rectangle &area,
                               GLenum format,
                               GLenum type,
                               void *pixels) override;
  
      angle::Result blit(const gl::Context *context,
                         const gl::Rectangle &sourceArea,
                         const gl::Rectangle &destArea,
                         GLbitfield mask,
                         GLenum filter) override;
  
      angle::Result getSamplePosition(const gl::Context *context,
                                      size_t index,
                                      GLfloat *xy) const override;
  
      // The GL back-end requires a full sync state before we call checkStatus.
      bool shouldSyncStateBeforeCheckStatus() const override;
  
      bool checkStatus(const gl::Context *context) const override;
  
      angle::Result syncState(const gl::Context *context,
                              const gl::Framebuffer::DirtyBits &dirtyBits) override;
  
      GLuint getFramebufferID() const;
      bool isDefault() const;
  
      bool hasEmulatedAlphaChannelTextureAttachment() const;
  
    private:
      void syncClearState(const gl::Context *context, GLbitfield mask);
      void syncClearBufferState(const gl::Context *context, GLenum buffer, GLint drawBuffer);
  
      bool modifyInvalidateAttachmentsForEmulatedDefaultFBO(
          size_t count,
          const GLenum *attachments,
          std::vector<GLenum> *modifiedAttachments) const;
  
      angle::Result readPixelsRowByRow(const gl::Context *context,
                                       const gl::Rectangle &area,
                                       GLenum format,
                                       GLenum type,
                                       const gl::PixelPackState &pack,
                                       GLubyte *pixels) const;
  
      angle::Result readPixelsAllAtOnce(const gl::Context *context,
                                        const gl::Rectangle &area,
                                        GLenum format,
                                        GLenum type,
                                        const gl::PixelPackState &pack,
                                        GLubyte *pixels,
                                        bool readLastRowSeparately) const;
  
      void maskOutInactiveOutputDrawBuffersImpl(const gl::Context *context,
                                                gl::DrawBufferMask targetAppliedDrawBuffers);
  
      angle::Result adjustSrcDstRegion(const gl::Context *context,
                                       const gl::Rectangle &sourceArea,
                                       const gl::Rectangle &destArea,
                                       gl::Rectangle *newSourceArea,
                                       gl::Rectangle *newDestArea);
  
      angle::Result clipSrcRegion(const gl::Context *context,
                                  const gl::Rectangle &sourceArea,
                                  const gl::Rectangle &destArea,
                                  gl::Rectangle *newSourceArea,
                                  gl::Rectangle *newDestArea);
  
      GLuint mFramebufferID;
      bool mIsDefault;
  
      bool mHasEmulatedAlphaAttachment;
  
      gl::DrawBufferMask mAppliedEnabledDrawBuffers;
  };
  }  // namespace rx
  
  #endif  // LIBANGLE_RENDERER_GL_FRAMEBUFFERGL_H_
  

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