kc3-lang/angle/src/compiler/translator/tree_ops/msl/RewriteInterpolants.h

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• Hash : 9b63700b
  Author :
  Date : 2023-07-11T10:25:40
  

  Translator: Reorganize files
  
  This change makes the translator files more organized by:
  
  - Grouping files that are specific to a certain output under their own
    directory,
  - Moving transformations under tree_ops
  - Removing Direct from metal translation now that that SPIR-V Cross path
    is removed
  
  Bug: angleproject:6394
  Change-Id: Iaf5bb8d5604b84748dece029821b1f77b2813967
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4678780
  Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
  Reviewed-by: Geoff Lang <geofflang@chromium.org>
  

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• src/compiler/translator/tree_ops/msl/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_TREEOPS_MSL_REWRITEINTERPOLANTS_H_
  #define COMPILER_TRANSLATOR_TREEOPS_MSL_REWRITEINTERPOLANTS_H_
  
  #include "compiler/translator/msl/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_TREEOPS_MSL_REWRITEINTERPOLANTS_H_
  

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