dc9510fe25
This PR sets up the ability for shaders to use `gl_ClipDistance`, which will be needed in the future. Desktop GL supports this natively. OpenGL ES requires the EXT_clip_cull_distance extension. Unfortunately glslang does not support this extension, so we have to employ a workaround for mobile when going through glslang. We instead write to `filament_gl_ClipDistance`, and then modify the SPIR-V to decorate this as `gl_ClipDistance`. See the comment in SpirvFixup.h. Note this PR does not actually use `gl_ClipDistance` yet, so there should be no change to shaders.
59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <gtest/gtest.h>
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#include "SpirvFixup.h"
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TEST(ClipDistanceFixup, NoReplacement) {
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std::string disassembly =
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" OpDecorate %gl_PerVertex Block\n"
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" %void = OpTypeVoid\n"
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" %3 = OpTypeFunction %void\n";
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std::string expected =
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" OpDecorate %gl_PerVertex Block\n"
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" %void = OpTypeVoid\n"
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" %3 = OpTypeFunction %void\n";
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EXPECT_EQ(filamat::fixupClipDistance(disassembly), false);
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EXPECT_EQ(disassembly, expected);
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}
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TEST(ClipDistanceFixup, BasicReplacement) {
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std::string disassembly =
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" OpDecorate %gl_PerVertex Block\n"
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" OpDecorate %filament_gl_ClipDistance Location 100\n"
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" %void = OpTypeVoid\n"
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" %3 = OpTypeFunction %void\n";
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std::string expected =
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" OpDecorate %gl_PerVertex Block\n"
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" OpDecorate %filament_gl_ClipDistance BuiltIn ClipDistance\n"
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" %void = OpTypeVoid\n"
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" %3 = OpTypeFunction %void\n";
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EXPECT_EQ(filamat::fixupClipDistance(disassembly), true);
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EXPECT_EQ(disassembly, expected);
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}
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TEST(ClipDistanceFixup, NoNewline) {
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std::string disassembly =
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" OpDecorate %gl_PerVertex Block\n"
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" OpDecorate %filament_gl_ClipDistance Location 100";
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std::string expected =
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" OpDecorate %gl_PerVertex Block\n"
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" OpDecorate %filament_gl_ClipDistance BuiltIn ClipDistance";
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EXPECT_EQ(filamat::fixupClipDistance(disassembly), true);
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EXPECT_EQ(disassembly, expected);
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}
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