kc3-lang/angle/src/libANGLE/renderer/metal/shaders/common.h

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• Hash : c0c938af
  Author :
  Date : 2020-05-11T00:50:00
  

  Metal: draw 1 triangle instead of 2 for fullscreen shaders.
  
  Reference article in favour of one big triangle instead of 2:
  https://michaldrobot.com/2014/04/01/gcn-execution-patterns-in-full-screen-passes/
  
  According to this article, the performance could be increased by ~10% for fullscreen shaders.
  
  Bug: angleproject:2634
  Change-Id: Ia5b04c40f0587e3cb8680c0f30f7b68d9d7a3efe
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2193192
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/libANGLE/renderer/metal/shaders/common.h

• //
  // Copyright 2019 The ANGLE Project. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  // common.h: Common header for other metal source code.
  
  #ifndef LIBANGLE_RENDERER_METAL_SHADERS_COMMON_H_
  #define LIBANGLE_RENDERER_METAL_SHADERS_COMMON_H_
  
  #ifndef SKIP_STD_HEADERS
  #    include <simd/simd.h>
  #    include <metal_stdlib>
  #endif
  
  #define ANGLE_KERNEL_GUARD(IDX, MAX_COUNT) \
      if (IDX >= MAX_COUNT)                  \
      {                                      \
          return;                            \
      }
  
  using namespace metal;
  
  // Full screen triangle's vertices
  constant float2 gCorners[3] = {float2(-1.0f, -1.0f), float2(3.0f, -1.0f), float2(-1.0f, 3.0f)};
  
  fragment float4 dummyFS()
  {
      return float4(0, 0, 0, 0);
  }
  #endif /* LIBANGLE_RENDERER_METAL_SHADERS_COMMON_H_ */
  

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