kc3-lang/angle/src/compiler/translator/tree_ops/vulkan/EmulateAdvancedBlendEquations.h

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• Hash : c5271e8e
  Author :
  Date : 2022-04-04T23:28:35
  

  Vulkan: Emulate GL_KHR_blend_equation_advanced
  
  Based on a change by Brandon Schade <b.schade@samsung.com>
  
  In the translator, when advanced blend is enabled, an input attachment
  is added.  Based on the listed advanced blend equations, emulation code
  is added that performs those equations' functions.  The blend equation
  itself is passed through a driver uniform.
  
  Note that the advanced blend extension only allows a single output to
  use advanced blend, and that should be at location 0.
  
  In the Vulkan backend, when advanced blend is used, the driver uniform
  to select the equation is updated and normal blending is disabled.
  
  Bug: angleproject:3586
  Change-Id: Icc42e8be238d34fca149087eb9cfe616a7643a6b
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3575738
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Yuxin Hu <yuxinhu@google.com>
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  

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• src/compiler/translator/tree_ops/vulkan/EmulateAdvancedBlendEquations.h

• //
  // Copyright 2022 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.
  //
  // EmulateAdvancedBlendEquations.h: Emulate advanced blend equations by implicitly reading back from
  // the color attachment (as an input attachment) and apply the equation function based on a uniform.
  //
  
  #ifndef COMPILER_TRANSLATOR_TREEOPS_VULKAN_EMULATEADVANCEDBLENDEQUATIONS_H_
  #define COMPILER_TRANSLATOR_TREEOPS_VULKAN_EMULATEADVANCEDBLENDEQUATIONS_H_
  
  #include "common/angleutils.h"
  
  namespace sh
  {
  
  class TCompiler;
  class TIntermBlock;
  class TSymbolTable;
  class DriverUniform;
  struct ShaderVariable;
  class AdvancedBlendEquations;
  
  // Declares the necessary input attachment (if not already for framebuffer fetch), loads from it and
  // implements the specified advanced blend equation functions.  A driver uniform is used to select
  // which function to use at runtime.
  ANGLE_NO_DISCARD bool EmulateAdvancedBlendEquations(
      TCompiler *compiler,
      TIntermBlock *root,
      TSymbolTable *symbolTable,
      const DriverUniform *driverUniforms,
      std::vector<ShaderVariable> *uniforms,
      const AdvancedBlendEquations &advancedBlendEquations);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TREEOPS_VULKAN_EMULATEADVANCEDBLENDEQUATIONS_H_
  

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