kc3-lang/angle/src/compiler/translator/TranslatorMetalDirect/RewriteInterpolants.h

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• Hash : d37c97d1
  Author :
  Date : 2023-04-17T00:00:00
  

  Metal: Implement OES_shader_multisample_interpolation
  
  * Added support for sample qualifier
    and shader interpolation functions
  
  * Added MSL-specific AST transformations
  
  * Adjusted minimum fragment interpolation offset state
    query test so that accurate limits could be reported
  
  * Drive-by: Y-flip gl_SamplePosition adjustment
  
  * Renamed ANGLESampleMaskEnabled function constant to
    ANGLEMultisampledRendering to correctly reflect its
    usage
  
  Bug: angleproject:8097
  Bug: angleproject:8131
  Change-Id: I25c9f36487e29f05bb9fe874e146d06378fef975
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4440827
  Reviewed-by: Kenneth Russell <kbr@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>
  

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• src/compiler/translator/TranslatorMetalDirect/RewriteInterpolants.h

• //
  // Copyright 2023 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.
  //
  
  #ifndef COMPILER_TRANSLATOR_TRANSLATORMETALDIRECT_REWRITEINTERPOLANTS_H_
  #define COMPILER_TRANSLATOR_TRANSLATORMETALDIRECT_REWRITEINTERPOLANTS_H_
  
  #include "compiler/translator/DriverUniformMetal.h"
  #include "compiler/translator/tree_util/IntermTraverse.h"
  
  namespace sh
  {
  
  // This transformation handles multisample interpolation semantics.
  //
  //  1. Types of all fragment inputs used with interpolation functions are adjusted with
  //     an interpolant flag because MSL treats them as a separate type (Section 2.18).
  //
  //  2. Offset origin (0, 0) is in the pixel's upper-left corner in Metal but
  //     in the pixel's center in OpenGL ES. Additionally, the Y direction may
  //     be flipped depending on the bound FBO.
  //
  //  3. When a fragment input is used with any interpolation function, its regular usages
  //     are wrapped with explicit interpolation functions based on the input's qualifier.
  //
  //  4. The outUsesSampleInterpolation variable is set to true if any fragment input
  //     uses sample qualifier. This flag limits gl_SampleMaskIn built-in variable to
  //     the current sample because Metal's [[sample_mask]] always contains all bits.
  //
  //  5. The outUsesSampleInterpolant variable is set to true if any fragment input that
  //     has sample qualifier and is used as an argument to an interpolation function is
  //     also used directly. This requires implicitly defining gl_SampleID.
  [[nodiscard]] bool RewriteInterpolants(TCompiler &compiler,
                                         TIntermBlock &root,
                                         TSymbolTable &symbolTable,
                                         const DriverUniformMetal *driverUniforms,
                                         bool *outUsesSampleInterpolation,
                                         bool *outUsesSampleInterpolant);
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TRANSLATORMETALDIRECT_REWRITEINTERPOLANTS_H_
  

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