initial checkin of SkSL compiler

src/gpu/vk/GrVkPipelineStateBuilder.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "vk/GrVkPipelineStateBuilder.h"
 
 #include "vk/GrVkGpu.h"
 #include "vk/GrVkRenderPass.h"
+#if USE_SKSL
+#include "SkSLCompiler.h"
+#endif
 
 GrVkPipelineState* GrVkPipelineStateBuilder::CreatePipelineState(
                                                                GrVkGpu* gpu,
                                                                const GrPipeline& pipeline,
                                                                const GrPrimitiveProcessor& primProc,
                                                                GrPrimitiveType primitiveType,
                                                                const GrVkPipelineState::Desc& desc,
                                                                const GrVkRenderPass& renderPass) {
     // create a builder.  This will be handed off to effects so they can use it to add
     // uniforms, varyings, textures, etc
@@ skipping 43 matching lines @@
     }
     if (visibility & kGeometry_GrShaderFlag) {
         flags |= VK_SHADER_STAGE_GEOMETRY_BIT;
     }
     if (visibility & kFragment_GrShaderFlag) {
         flags |= VK_SHADER_STAGE_FRAGMENT_BIT;
     }
     return flags;
 }
 
+#if USE_SKSL
+SkSL::Program::Kind vk_shader_stage_to_skiasl_kind(VkShaderStageFlagBits stage) {
+    if (VK_SHADER_STAGE_VERTEX_BIT == stage) {
+        return SkSL::Program::kVertex_Kind;
+    }
+    SkASSERT(VK_SHADER_STAGE_FRAGMENT_BIT == stage);
+    return SkSL::Program::kFragment_Kind;
+}
+#else
 shaderc_shader_kind vk_shader_stage_to_shaderc_kind(VkShaderStageFlagBits stage) {
     if (VK_SHADER_STAGE_VERTEX_BIT == stage) {
         return shaderc_glsl_vertex_shader;
     }
     SkASSERT(VK_SHADER_STAGE_FRAGMENT_BIT == stage);
     return shaderc_glsl_fragment_shader;
 }
+#endif
 
+#include <fstream>
+#include <sstream>
 bool GrVkPipelineStateBuilder::CreateVkShaderModule(const GrVkGpu* gpu,
                                                     VkShaderStageFlagBits stage,
                                                     const GrGLSLShaderBuilder& builder,
                                                     VkShaderModule* shaderModule,
                                                     VkPipelineShaderStageCreateInfo* stageInfo) {
     SkString shaderString;
     for (int i = 0; i < builder.fCompilerStrings.count(); ++i) {
         if (builder.fCompilerStrings[i]) {
             shaderString.append(builder.fCompilerStrings[i]);
             shaderString.append("\n");
         }
     }
 
     VkShaderModuleCreateInfo moduleCreateInfo;
     memset(&moduleCreateInfo, 0, sizeof(VkShaderModuleCreateInfo));
     moduleCreateInfo.sType = VK_STRUCTURE_TYPE_SHADER_MODULE_CREATE_INFO;
     moduleCreateInfo.pNext = nullptr;
     moduleCreateInfo.flags = 0;
 
+#if USE_SKSL
+    std::string code;
+#else
     shaderc_compilation_result_t result = nullptr;
+#endif
 
     if (gpu->vkCaps().canUseGLSLForShaderModule()) {
         moduleCreateInfo.codeSize = strlen(shaderString.c_str());
         moduleCreateInfo.pCode = (const uint32_t*)shaderString.c_str();
     } else {
 
+#if USE_SKSL
+        bool result = gpu->shaderCompiler()->toSPIRV(vk_shader_stage_to_skiasl_kind(stage), 
+                                                     std::string(shaderString.c_str()),
+                                                     &code);
+        if (!result) {
+            SkDebugf("%s\n", gpu->shaderCompiler()->errorText().c_str());
+            return false;
+        }
+        moduleCreateInfo.codeSize = code.size();
+        moduleCreateInfo.pCode = (const uint32_t*) code.c_str();
+#else
         shaderc_compiler_t compiler = gpu->shadercCompiler();
 
         shaderc_compile_options_t options = shaderc_compile_options_initialize();
 
         shaderc_shader_kind shadercStage = vk_shader_stage_to_shaderc_kind(stage);
         result = shaderc_compile_into_spv(compiler,
                                           shaderString.c_str(),
                                           strlen(shaderString.c_str()),
                                           shadercStage,
                                           "shader",
                                           "main",
                                           options);
         shaderc_compile_options_release(options);
 #ifdef SK_DEBUG
         if (shaderc_result_get_num_errors(result)) {
             SkDebugf("%s\n", shaderString.c_str());
             SkDebugf("%s\n", shaderc_result_get_error_message(result));
             return false;
         }
-#endif
+#endif // SK_DEBUG
 
         moduleCreateInfo.codeSize = shaderc_result_get_length(result);
         moduleCreateInfo.pCode = (const uint32_t*)shaderc_result_get_bytes(result);
+#endif // USE_SKSL
     }
 
     VkResult err = GR_VK_CALL(gpu->vkInterface(), CreateShaderModule(gpu->device(),
                                                                      &moduleCreateInfo,
                                                                      nullptr,
                                                                      shaderModule));
+
     if (!gpu->vkCaps().canUseGLSLForShaderModule()) {
+#if !USE_SKSL
         shaderc_result_release(result);
+#endif
     }
     if (err) {
         return false;
     }
 
     memset(stageInfo, 0, sizeof(VkPipelineShaderStageCreateInfo));
     stageInfo->sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;
     stageInfo->pNext = nullptr;
     stageInfo->flags = 0;
     stageInfo->stage = stage;
@@ skipping 116 matching lines @@
                                  dsLayout[GrVkUniformHandler::kSamplerDescSet],
                                  fUniformHandles,
                                  fUniformHandler.fUniforms,
                                  fUniformHandler.fCurrentVertexUBOOffset,
                                  fUniformHandler.fCurrentFragmentUBOOffset,
                                  numSamplers,
                                  fGeometryProcessor,
                                  fXferProcessor,
                                  fFragmentProcessors);
 }