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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//
// 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_