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- listed locations are masked to 8/16 bits or sign-extended from them at the top of main - each input becomes a Private copy seeded once; access chains are retyped, arrays go per element
39 lines
2.0 KiB
C++
39 lines
2.0 KiB
C++
// MobileGL - MobileGL/MG_Util/ShaderTranspiler/NarrowIntegerVertexInputs.h
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// Copyright (c) 2025-2026 MobileGL-Dev
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// Licensed under the GNU Lesser General Public License v3.0:
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// https://www.gnu.org/licenses/gpl-3.0.txt
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// https://www.gnu.org/licenses/lgpl-3.0.txt
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// SPDX-License-Identifier: LGPL-3.0-only
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// End of Source File Header
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#pragma once
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#include <Includes.h>
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namespace MobileGL {
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namespace MG_Util {
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namespace ShaderTranspiler {
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// The vertex input locations whose integer value a vertex module has to widen itself,
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// one bit per location in each mask, and how. Every desktop GL driver hands an integer
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// input the source integer converted to 32 bits by the SOURCE type's signedness and
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// then reinterpreted as the declared int/uint type. A Vulkan fetch whose format has to
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// carry the input's signedness instead extends by the wrong rule for 8/16-bit data:
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// - zeroExtend*: an int input fed unsigned bytes/shorts, fetched sign-extended, is
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// masked back to its low 8/16 bits;
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// - signExtend*: a uint input fed signed bytes/shorts, fetched zero-extended, has its
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// low 8/16 bits sign-extended.
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// Plain data so the shader pass, the program cache key and the draw path share it.
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struct NarrowIntegerVertexInputs {
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Uint32 zeroExtend8 = 0;
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Uint32 zeroExtend16 = 0;
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Uint32 signExtend8 = 0;
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Uint32 signExtend16 = 0;
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constexpr Bool Any() const { return (zeroExtend8 | zeroExtend16 | signExtend8 | signExtend16) != 0; }
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constexpr Bool operator==(const NarrowIntegerVertexInputs&) const = default;
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};
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// Hashed as raw bytes by the program cache, so it must stay free of padding.
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static_assert(sizeof(NarrowIntegerVertexInputs) == 4 * sizeof(Uint32));
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} // namespace ShaderTranspiler
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} // namespace MG_Util
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} // namespace MobileGL
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