kc3-lang/angle/src/libANGLE/renderer/wgpu/wgpu_wgsl_util.h

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• Hash : 4b69ba93
  Author :
  Date : 2025-04-28T16:45:56
  

  WGPU: upload texture bind groups and configured samplers
  
  GLSL samplers are split into separate sampler/texture variables
  in WGSL. Before this CL, the WGSL translator generated shaders
  that look like:
  
  @group(1) @binding(@@@@@@) var ANGLE_sampler_samp2D :
     sampler;
  @group(1) @binding(@@@@@@) var ANGLE_texture_samp2D :
     texture_2d<f32>;
  @group(1) @binding(@@@@@@) var ANGLE_sampler_sampCube :
      sampler;
  @group(1) @binding(@@@@@@) var ANGLE_texture_sampCube :
      texture_cube<f32>;
  
  This CL replaces those with actual binding numbers
  @group(1) @binding(0) var ANGLE_sampler_samp2D :
     sampler;
  @group(1) @binding(1) var ANGLE_texture_samp2D :
     texture_2d<f32>;
  ...
  
  Such that @binding(n*2) is the WGSL sampler variable corresponding
  to the n-th GLSL sampler and @binding(n*2+1) is the WGSL texture
  variable corresponding to the n-th GLSL sampler.
  
  This CL then generates binding group layouts matching the above,
  and uploads textures and configured samplers in bind groups.
  
  This makes some of the deqp_gles2 tests 2d texture tests pass,
  though some fail because they need a flipped y coordinate.
  
  Not yet supported:
  1. arrays of samplers
  2. shadow samplers
  3. cube textures
  
  Bug: angleproject:389145696
  Change-Id: I2ab18ae5ebb4d1289101266bd9451576aa04ce2a
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6382272
  Reviewed-by: Liza Burakova <liza@chromium.org>
  Auto-Submit: Matthew Denton <mpdenton@chromium.org>
  Commit-Queue: Geoff Lang <geofflang@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/libANGLE/renderer/wgpu/wgpu_wgsl_util.h

• //
  // Copyright 2024 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.
  //
  // wgpu_wgsl_util.h: Utilities to manipulate previously translated WGSL.
  //
  
  #ifndef LIBANGLE_RENDERER_WGPU_WGPU_WGSL_UTIL_H_
  #define LIBANGLE_RENDERER_WGPU_WGPU_WGSL_UTIL_H_
  
  #include "common/PackedGLEnums_autogen.h"
  #include "libANGLE/Program.h"
  
  namespace rx
  {
  namespace webgpu
  {
  
  // Replaces location markers in the WGSL source with actual locations, for
  // `shaderVars` which is a vector of either gl::ProgramInputs or gl::ProgramOutputs, and for
  // `mergedVaryings` which get assigned sequentially increasing locations. There should be at most
  // vertex and fragment shader stages or this function will not assign locations correctly.
  //
  // Also assigns sampler bindings, which are split into two separate sampler/texture
  // variables in WGSL and are assigned binding numbers as such:
  // @binding(n*2) for the WGSL sampler variable corresponding to the n-th GLSL sampler
  // @binding(n*2+1) for the WGSL texture variable corresponding to the n-th GLSL sampler.
  template <typename T>
  std::string WgslAssignLocationsAndSamplerBindings(const gl::ProgramExecutable &executable,
                                                    const std::string &shaderSource,
                                                    const std::vector<T> shaderVars,
                                                    const gl::ProgramMergedVaryings &mergedVaryings,
                                                    gl::ShaderType shaderType);
  
  }  // namespace webgpu
  }  // namespace rx
  
  #endif /* LIBANGLE_RENDERER_WGPU_WGPU_WGSL_UTIL_H_ */
  

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