kc3-lang/angle/src/libANGLE/renderer/vulkan/ShaderVk.cpp

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• Author : Shahbaz Youssefi
  Date : 2021-06-11 16:36:32
  Hash : 153240b2
  Message : Vulkan: SPIR-V Gen: Support loops Loops are similar to if-else in that they generate a number of blocks where the first block specifies divergence (OpLoopMerge) and the merge block. Differently from if-else, there is a block where the condition is evaluated and a block which `continue;` leads to (this last block is the only one allowed to back-jump to the beginning of the loop). Bug: angleproject:4889 Change-Id: Ic59f4bf3e05fbf93cb5af85acd3bc4b0da8412af Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2957809 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>

• src/libANGLE/renderer/vulkan/ShaderVk.cpp

• //
  // Copyright 2016 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.
  //
  // ShaderVk.cpp:
  //    Implements the class methods for ShaderVk.
  //
  
  #include "libANGLE/renderer/vulkan/ShaderVk.h"
  
  #include "common/debug.h"
  #include "libANGLE/Context.h"
  #include "libANGLE/renderer/vulkan/ContextVk.h"
  #include "platform/FeaturesVk.h"
  
  namespace rx
  {
  
  ShaderVk::ShaderVk(const gl::ShaderState &state) : ShaderImpl(state) {}
  
  ShaderVk::~ShaderVk() {}
  
  std::shared_ptr<WaitableCompileEvent> ShaderVk::compile(const gl::Context *context,
                                                          gl::ShCompilerInstance *compilerInstance,
                                                          ShCompileOptions options)
  {
      ShCompileOptions compileOptions = 0;
  
      ContextVk *contextVk = vk::GetImpl(context);
  
      bool isWebGL = context->getExtensions().webglCompatibility;
  
      if (isWebGL)
      {
          // Only webgl requires initialization of local variables, others don't.
          // Extra initialization in spirv shader may affect performance.
          compileOptions |= SH_INITIALIZE_UNINITIALIZED_LOCALS;
  
          // WebGL shaders may contain OOB array accesses which in turn cause undefined behavior,
          // which may result in security issues. See https://crbug.com/1189110.
          compileOptions |= SH_CLAMP_INDIRECT_ARRAY_BOUNDS;
  
          if (mState.getShaderType() != gl::ShaderType::Compute)
          {
              compileOptions |= SH_INIT_OUTPUT_VARIABLES;
          }
      }
  
      if (contextVk->getFeatures().clampPointSize.enabled)
      {
          compileOptions |= SH_CLAMP_POINT_SIZE;
      }
  
      if (contextVk->getFeatures().basicGLLineRasterization.enabled)
      {
          compileOptions |= SH_ADD_BRESENHAM_LINE_RASTER_EMULATION;
      }
  
      if (contextVk->emulateSeamfulCubeMapSampling())
      {
          compileOptions |= SH_EMULATE_SEAMFUL_CUBE_MAP_SAMPLING;
      }
  
      if (!contextVk->getFeatures().enablePrecisionQualifiers.enabled)
      {
          compileOptions |= SH_IGNORE_PRECISION_QUALIFIERS;
      }
  
      if (contextVk->getFeatures().forceFragmentShaderPrecisionHighpToMediump.enabled)
      {
          compileOptions |= SH_FORCE_SHADER_PRECISION_HIGHP_TO_MEDIUMP;
      }
  
      // Let compiler detect and emit early fragment test execution mode. We will remove it if
      // context state does not allow it
      compileOptions |= SH_EARLY_FRAGMENT_TESTS_OPTIMIZATION;
  
      // Let compiler use specialized constant for pre-rotation.
      if (!contextVk->getFeatures().forceDriverUniformOverSpecConst.enabled)
      {
          compileOptions |= SH_USE_SPECIALIZATION_CONSTANT;
      }
  
      if (contextVk->getFeatures().enablePreRotateSurfaces.enabled ||
          contextVk->getFeatures().emulatedPrerotation90.enabled ||
          contextVk->getFeatures().emulatedPrerotation180.enabled ||
          contextVk->getFeatures().emulatedPrerotation270.enabled)
      {
          // Let compiler insert pre-rotation code.
          compileOptions |= SH_ADD_PRE_ROTATION;
      }
  
      if (contextVk->getFeatures().supportsTransformFeedbackExtension.enabled)
      {
          compileOptions |= SH_ADD_VULKAN_XFB_EXTENSION_SUPPORT_CODE;
      }
      else if (mState.getShaderType() == gl::ShaderType::Vertex &&
               contextVk->getFeatures().emulateTransformFeedback.enabled)
      {
          compileOptions |= SH_ADD_VULKAN_XFB_EMULATION_SUPPORT_CODE;
      }
  
      if (contextVk->getFeatures().directSPIRVGeneration.enabled)
      {
          compileOptions |= SH_GENERATE_SPIRV_DIRECTLY;
  
          if (contextVk->getFeatures().directSPIRVGenerationWorkarounds.enabled)
          {
              compileOptions |= SH_GENERATE_SPIRV_WORKAROUNDS;
          }
      }
  
      return compileImpl(context, compilerInstance, mState.getSource(), compileOptions | options);
  }
  
  std::string ShaderVk::getDebugInfo() const
  {
      return mState.getCompiledBinary().empty() ? "" : "<binary blob>";
  }
  
  }  // namespace rx