зеркало из https://github.com/mozilla/gecko-dev.git
448 строки
14 KiB
C++
448 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebGLShaderValidator.h"
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#include "GLContext.h"
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#include "mozilla/gfx/Logging.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/StaticPrefs_webgl.h"
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#include "MurmurHash3.h"
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#include "nsPrintfCString.h"
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#include <string>
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#include <vector>
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#include "WebGLContext.h"
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namespace mozilla {
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namespace webgl {
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uint64_t IdentifierHashFunc(const char* name, size_t len) {
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// NB: we use the x86 function everywhere, even though it's suboptimal perf
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// on x64. They return different results; not sure if that's a requirement.
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uint64_t hash[2];
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MurmurHash3_x86_128(name, len, 0, hash);
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return hash[0];
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}
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static ShCompileOptions ChooseValidatorCompileOptions(
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const ShBuiltInResources& resources, const mozilla::gl::GLContext* gl) {
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ShCompileOptions options = SH_VARIABLES | SH_ENFORCE_PACKING_RESTRICTIONS |
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SH_OBJECT_CODE | SH_INIT_GL_POSITION |
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SH_INITIALIZE_UNINITIALIZED_LOCALS |
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SH_INIT_OUTPUT_VARIABLES;
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#ifdef XP_MACOSX
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options |= SH_REMOVE_INVARIANT_AND_CENTROID_FOR_ESSL3;
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#else
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// We want to do this everywhere, but to do this on Mac, we need
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// to do it only on Mac OSX > 10.6 as this causes the shader
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// compiler in 10.6 to crash
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options |= SH_CLAMP_INDIRECT_ARRAY_BOUNDS;
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#endif
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if (gl->WorkAroundDriverBugs()) {
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#ifdef XP_MACOSX
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// Work around https://bugs.webkit.org/show_bug.cgi?id=124684,
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// https://chromium.googlesource.com/angle/angle/+/5e70cf9d0b1bb
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options |= SH_UNFOLD_SHORT_CIRCUIT;
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// Work around that Mac drivers handle struct scopes incorrectly.
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options |= SH_REGENERATE_STRUCT_NAMES;
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options |= SH_INIT_OUTPUT_VARIABLES;
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if (gl->Vendor() == gl::GLVendor::Intel) {
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// Work around that Intel drivers on Mac OSX handle for-loop incorrectly.
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options |= SH_ADD_AND_TRUE_TO_LOOP_CONDITION;
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options |= SH_REWRITE_TEXELFETCHOFFSET_TO_TEXELFETCH;
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}
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#endif
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if (!gl->IsANGLE() && gl->Vendor() == gl::GLVendor::Intel) {
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// Failures on at least Windows+Intel+OGL on:
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// conformance/glsl/constructors/glsl-construct-mat2.html
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options |= SH_SCALARIZE_VEC_AND_MAT_CONSTRUCTOR_ARGS;
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}
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}
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if (StaticPrefs::webgl_all_angle_options()) {
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options = -1;
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options ^= SH_INTERMEDIATE_TREE;
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options ^= SH_LINE_DIRECTIVES;
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options ^= SH_SOURCE_PATH;
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options ^= SH_LIMIT_EXPRESSION_COMPLEXITY;
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options ^= SH_LIMIT_CALL_STACK_DEPTH;
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options ^= SH_EXPAND_SELECT_HLSL_INTEGER_POW_EXPRESSIONS;
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options ^= SH_HLSL_GET_DIMENSIONS_IGNORES_BASE_LEVEL;
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options ^= SH_DONT_REMOVE_INVARIANT_FOR_FRAGMENT_INPUT;
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options ^= SH_REMOVE_INVARIANT_AND_CENTROID_FOR_ESSL3;
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}
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if (resources.MaxExpressionComplexity > 0) {
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options |= SH_LIMIT_EXPRESSION_COMPLEXITY;
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}
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if (resources.MaxCallStackDepth > 0) {
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options |= SH_LIMIT_CALL_STACK_DEPTH;
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}
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return options;
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}
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} // namespace webgl
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////////////////////////////////////////
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static ShShaderOutput ShaderOutput(gl::GLContext* gl) {
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if (gl->IsGLES()) {
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return SH_ESSL_OUTPUT;
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}
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uint32_t version = gl->ShadingLanguageVersion();
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switch (version) {
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case 100:
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return SH_GLSL_COMPATIBILITY_OUTPUT;
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case 120:
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return SH_GLSL_COMPATIBILITY_OUTPUT;
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case 130:
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return SH_GLSL_130_OUTPUT;
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case 140:
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return SH_GLSL_140_OUTPUT;
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case 150:
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return SH_GLSL_150_CORE_OUTPUT;
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case 330:
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return SH_GLSL_330_CORE_OUTPUT;
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case 400:
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return SH_GLSL_400_CORE_OUTPUT;
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case 410:
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return SH_GLSL_410_CORE_OUTPUT;
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case 420:
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return SH_GLSL_420_CORE_OUTPUT;
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case 430:
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return SH_GLSL_430_CORE_OUTPUT;
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case 440:
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return SH_GLSL_440_CORE_OUTPUT;
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default:
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if (version >= 450) {
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// "OpenGL 4.6 is also guaranteed to support all previous versions of
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// the OpenGL Shading Language back to version 1.10."
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return SH_GLSL_450_CORE_OUTPUT;
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}
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gfxCriticalNote << "Unexpected GLSL version: " << version;
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}
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return SH_GLSL_COMPATIBILITY_OUTPUT;
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}
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std::unique_ptr<webgl::ShaderValidator> WebGLContext::CreateShaderValidator(
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GLenum shaderType) const {
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const auto spec = (IsWebGL2() ? SH_WEBGL2_SPEC : SH_WEBGL_SPEC);
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const auto outputLanguage = ShaderOutput(gl);
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ShBuiltInResources resources;
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memset(&resources, 0, sizeof(resources));
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sh::InitBuiltInResources(&resources);
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resources.HashFunction = webgl::IdentifierHashFunc;
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const auto& limits = Limits();
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resources.MaxVertexAttribs = limits.maxVertexAttribs;
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resources.MaxVertexUniformVectors = mGLMaxVertexUniformVectors;
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resources.MaxVertexTextureImageUnits = mGLMaxVertexTextureImageUnits;
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resources.MaxCombinedTextureImageUnits = limits.maxTexUnits;
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resources.MaxTextureImageUnits = mGLMaxFragmentTextureImageUnits;
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resources.MaxFragmentUniformVectors = mGLMaxFragmentUniformVectors;
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resources.MaxVertexOutputVectors = mGLMaxVertexOutputVectors;
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resources.MaxFragmentInputVectors = mGLMaxFragmentInputVectors;
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resources.MaxVaryingVectors = mGLMaxFragmentInputVectors;
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if (IsWebGL2()) {
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resources.MinProgramTexelOffset = mGLMinProgramTexelOffset;
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resources.MaxProgramTexelOffset = mGLMaxProgramTexelOffset;
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}
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resources.MaxDrawBuffers = MaxValidDrawBuffers();
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if (IsExtensionEnabled(WebGLExtensionID::EXT_frag_depth))
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resources.EXT_frag_depth = 1;
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if (IsExtensionEnabled(WebGLExtensionID::OES_standard_derivatives))
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resources.OES_standard_derivatives = 1;
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if (IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers))
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resources.EXT_draw_buffers = 1;
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if (IsExtensionEnabled(WebGLExtensionID::EXT_shader_texture_lod))
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resources.EXT_shader_texture_lod = 1;
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if (IsExtensionEnabled(WebGLExtensionID::OVR_multiview2)) {
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resources.OVR_multiview = 1;
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resources.OVR_multiview2 = 1;
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resources.MaxViewsOVR = limits.maxMultiviewLayers;
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}
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// Tell ANGLE to allow highp in frag shaders. (unless disabled)
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// If underlying GLES doesn't have highp in frag shaders, it should complain
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// anyways.
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resources.FragmentPrecisionHigh = mDisableFragHighP ? 0 : 1;
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if (gl->WorkAroundDriverBugs()) {
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#ifdef XP_MACOSX
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if (gl->Vendor() == gl::GLVendor::NVIDIA) {
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// Work around bug 890432
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resources.MaxExpressionComplexity = 1000;
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}
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#endif
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}
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const auto compileOptions =
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webgl::ChooseValidatorCompileOptions(resources, gl);
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return webgl::ShaderValidator::Create(shaderType, spec, outputLanguage,
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resources, compileOptions);
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}
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////////////////////////////////////////
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namespace webgl {
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/*static*/
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std::unique_ptr<ShaderValidator> ShaderValidator::Create(
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GLenum shaderType, ShShaderSpec spec, ShShaderOutput outputLanguage,
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const ShBuiltInResources& resources, ShCompileOptions compileOptions) {
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ShHandle handle =
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sh::ConstructCompiler(shaderType, spec, outputLanguage, &resources);
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MOZ_RELEASE_ASSERT(handle);
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if (!handle) return nullptr;
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return std::unique_ptr<ShaderValidator>(
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new ShaderValidator(handle, compileOptions, resources.MaxVaryingVectors));
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}
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ShaderValidator::~ShaderValidator() { sh::Destruct(mHandle); }
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std::unique_ptr<const ShaderValidatorResults>
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ShaderValidator::ValidateAndTranslate(const char* const source) const {
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auto ret = std::make_unique<ShaderValidatorResults>();
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const std::array<const char*, 1> parts = {source};
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ret->mValid =
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sh::Compile(mHandle, parts.data(), parts.size(), mCompileOptions);
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ret->mInfoLog = sh::GetInfoLog(mHandle);
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if (ret->mValid) {
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ret->mObjectCode = sh::GetObjectCode(mHandle);
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ret->mShaderVersion = sh::GetShaderVersion(mHandle);
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ret->mVertexShaderNumViews = sh::GetVertexShaderNumViews(mHandle);
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ret->mAttributes = *sh::GetAttributes(mHandle);
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ret->mInterfaceBlocks = *sh::GetInterfaceBlocks(mHandle);
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ret->mOutputVariables = *sh::GetOutputVariables(mHandle);
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ret->mUniforms = *sh::GetUniforms(mHandle);
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ret->mVaryings = *sh::GetVaryings(mHandle);
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ret->mMaxVaryingVectors = mMaxVaryingVectors;
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const auto& nameMap = *sh::GetNameHashingMap(mHandle);
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for (const auto& pair : nameMap) {
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ret->mNameMap.insert(pair);
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}
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}
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sh::ClearResults(mHandle);
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return ret;
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}
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template <size_t N>
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static bool StartsWith(const std::string& haystack, const char (&needle)[N]) {
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return haystack.compare(0, N - 1, needle) == 0;
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}
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bool ShaderValidatorResults::CanLinkTo(const ShaderValidatorResults& vert,
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nsCString* const out_log) const {
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MOZ_ASSERT(mValid);
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MOZ_ASSERT(vert.mValid);
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if (vert.mShaderVersion != mShaderVersion) {
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nsPrintfCString error(
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"Vertex shader version %d does not match"
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" fragment shader version %d.",
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vert.mShaderVersion, mShaderVersion);
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*out_log = error;
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return false;
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}
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for (const auto& itrFrag : mUniforms) {
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for (const auto& itrVert : vert.mUniforms) {
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if (itrVert.name != itrFrag.name) continue;
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if (!itrVert.isSameUniformAtLinkTime(itrFrag)) {
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nsPrintfCString error(
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"Uniform `%s` is not linkable between"
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" attached shaders.",
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itrFrag.name.c_str());
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*out_log = error;
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return false;
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}
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break;
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}
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}
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for (const auto& fragVar : mInterfaceBlocks) {
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for (const auto& vertVar : vert.mInterfaceBlocks) {
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if (vertVar.name != fragVar.name) continue;
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if (!vertVar.isSameInterfaceBlockAtLinkTime(fragVar)) {
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nsPrintfCString error(
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"Interface block `%s` is not linkable between"
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" attached shaders.",
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fragVar.name.c_str());
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*out_log = error;
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return false;
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}
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break;
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}
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}
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{
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std::vector<sh::ShaderVariable> staticUseVaryingList;
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for (const auto& fragVarying : mVaryings) {
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static const char prefix[] = "gl_";
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if (StartsWith(fragVarying.name, prefix)) {
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if (fragVarying.staticUse) {
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staticUseVaryingList.push_back(fragVarying);
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}
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continue;
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}
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bool definedInVertShader = false;
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bool staticVertUse = false;
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for (const auto& vertVarying : vert.mVaryings) {
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if (vertVarying.name != fragVarying.name) continue;
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if (!vertVarying.isSameVaryingAtLinkTime(fragVarying, mShaderVersion)) {
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nsPrintfCString error(
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"Varying `%s`is not linkable between"
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" attached shaders.",
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fragVarying.name.c_str());
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*out_log = error;
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return false;
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}
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definedInVertShader = true;
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staticVertUse = vertVarying.staticUse;
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break;
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}
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if (!definedInVertShader && fragVarying.staticUse) {
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nsPrintfCString error(
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"Varying `%s` has static-use in the frag"
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" shader, but is undeclared in the vert"
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" shader.",
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fragVarying.name.c_str());
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*out_log = error;
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return false;
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}
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if (staticVertUse && fragVarying.staticUse) {
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staticUseVaryingList.push_back(fragVarying);
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}
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}
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if (!sh::CheckVariablesWithinPackingLimits(mMaxVaryingVectors,
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staticUseVaryingList)) {
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*out_log =
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"Statically used varyings do not fit within packing limits. (see"
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" GLSL ES Specification 1.0.17, p111)";
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return false;
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}
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}
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if (mShaderVersion == 100) {
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// Enforce ESSL1 invariant linking rules.
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bool isInvariant_Position = false;
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bool isInvariant_PointSize = false;
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bool isInvariant_FragCoord = false;
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bool isInvariant_PointCoord = false;
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for (const auto& varying : vert.mVaryings) {
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if (varying.name == "gl_Position") {
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isInvariant_Position = varying.isInvariant;
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} else if (varying.name == "gl_PointSize") {
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isInvariant_PointSize = varying.isInvariant;
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}
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}
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for (const auto& varying : mVaryings) {
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if (varying.name == "gl_FragCoord") {
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isInvariant_FragCoord = varying.isInvariant;
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} else if (varying.name == "gl_PointCoord") {
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isInvariant_PointCoord = varying.isInvariant;
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}
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}
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////
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const auto fnCanBuiltInsLink = [](bool vertIsInvariant,
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bool fragIsInvariant) {
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if (vertIsInvariant) return true;
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return !fragIsInvariant;
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};
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if (!fnCanBuiltInsLink(isInvariant_Position, isInvariant_FragCoord)) {
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*out_log =
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"gl_Position must be invariant if gl_FragCoord is. (see GLSL ES"
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" Specification 1.0.17, p39)";
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return false;
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}
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if (!fnCanBuiltInsLink(isInvariant_PointSize, isInvariant_PointCoord)) {
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*out_log =
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"gl_PointSize must be invariant if gl_PointCoord is. (see GLSL ES"
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" Specification 1.0.17, p39)";
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return false;
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}
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}
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return true;
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}
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size_t ShaderValidatorResults::SizeOfIncludingThis(
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const MallocSizeOf fnSizeOf) const {
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auto ret = fnSizeOf(this);
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ret += mInfoLog.size();
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ret += mObjectCode.size();
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for (const auto& cur : mAttributes) {
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ret += fnSizeOf(&cur);
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}
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for (const auto& cur : mInterfaceBlocks) {
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ret += fnSizeOf(&cur);
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}
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for (const auto& cur : mOutputVariables) {
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ret += fnSizeOf(&cur);
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}
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for (const auto& cur : mUniforms) {
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ret += fnSizeOf(&cur);
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}
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for (const auto& cur : mVaryings) {
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ret += fnSizeOf(&cur);
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}
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return ret;
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}
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} // namespace webgl
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} // namespace mozilla
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