added sk_FragCoord support to skslc

BUG=skia:

Change-Id: If78a4d08121699f87659f0d2e35f3edbf1867401
Reviewed-on: https://skia-review.googlesource.com/5408
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>

4 files changed, 37 insertions, 16 deletions

diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.cpp b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
index cc29022456..045593ff42 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.cpp
@@ -69,7 +69,9 @@ const GrCaps* GrGLProgramBuilder::caps() const {
 bool GrGLProgramBuilder::compileAndAttachShaders(GrGLSLShaderBuilder& shader,
                                                  GrGLuint programId,
                                                  GrGLenum type,
-                                                 SkTDArray<GrGLuint>* shaderIds) {
+                                                 SkTDArray<GrGLuint>* shaderIds,
+                                                 const SkSL::Program::Settings& settings,
+                                                 SkSL::Program::Inputs* outInputs) {
     GrGLGpu* gpu = this->gpu();
     GrGLuint shaderId = GrGLCompileAndAttachShader(gpu->glContext(),
                                                    programId,
@@ -77,7 +79,9 @@ bool GrGLProgramBuilder::compileAndAttachShaders(GrGLSLShaderBuilder& shader,
                                                    shader.fCompilerStrings.begin(),
                                                    shader.fCompilerStringLengths.begin(),
                                                    shader.fCompilerStrings.count(),
-                                                   gpu->stats());
+                                                   gpu->stats(),
+                                                   settings,
+                                                   outInputs);
 
     if (!shaderId) {
         return false;
@@ -100,8 +104,13 @@ GrGLProgram* GrGLProgramBuilder::finalize() {
     this->finalizeShaders();
 
     // compile shaders and bind attributes / uniforms
+    SkSL::Program::Settings settings;
+    settings.fCaps = this->gpu()->glCaps().shaderCaps();
+    settings.fFlipY = this->pipeline().getRenderTarget()->origin() != kTopLeft_GrSurfaceOrigin;
+    SkSL::Program::Inputs inputs;
     SkTDArray<GrGLuint> shadersToDelete;
-    if (!this->compileAndAttachShaders(fVS, programID, GR_GL_VERTEX_SHADER, &shadersToDelete)) {
+    if (!this->compileAndAttachShaders(fVS, programID, GR_GL_VERTEX_SHADER, &shadersToDelete,
+                                       settings, &inputs)) {
         this->cleanupProgram(programID, shadersToDelete);
         return nullptr;
     }
@@ -117,16 +126,22 @@ GrGLProgram* GrGLProgramBuilder::finalize() {
     }
 
     if (primProc.willUseGeoShader() &&
-        !this->compileAndAttachShaders(fGS, programID, GR_GL_GEOMETRY_SHADER, &shadersToDelete)) {
+        !this->compileAndAttachShaders(fGS, programID, GR_GL_GEOMETRY_SHADER, &shadersToDelete,
+                                       settings, &inputs)) {
         this->cleanupProgram(programID, shadersToDelete);
         return nullptr;
     }
 
-    if (!this->compileAndAttachShaders(fFS, programID, GR_GL_FRAGMENT_SHADER, &shadersToDelete)) {
+    if (!this->compileAndAttachShaders(fFS, programID, GR_GL_FRAGMENT_SHADER, &shadersToDelete,
+                                       settings, &inputs)) {
         this->cleanupProgram(programID, shadersToDelete);
         return nullptr;
     }
 
+    if (inputs.fRTHeight) {
+        this->addRTHeightUniform(SKSL_RTHEIGHT_NAME);
+    }
+
     this->bindProgramResourceLocations(programID);
 
     GL_CALL(LinkProgram(programID));
diff --git a/src/gpu/gl/builders/GrGLProgramBuilder.h b/src/gpu/gl/builders/GrGLProgramBuilder.h
index a88f278b93..84d6d91a57 100644
--- a/src/gpu/gl/builders/GrGLProgramBuilder.h
+++ b/src/gpu/gl/builders/GrGLProgramBuilder.h
@@ -14,6 +14,7 @@
 #include "gl/GrGLVaryingHandler.h"
 #include "glsl/GrGLSLProgramBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
+#include "ir/SkSLProgram.h"
 
 class GrFragmentProcessor;
 class GrGLContextInfo;
@@ -46,7 +47,9 @@ private:
     bool compileAndAttachShaders(GrGLSLShaderBuilder& shader,
                                  GrGLuint programId,
                                  GrGLenum type,
-                                 SkTDArray<GrGLuint>* shaderIds);
+                                 SkTDArray<GrGLuint>* shaderIds,
+                                 const SkSL::Program::Settings& settings,
+                                 SkSL::Program::Inputs* outInputs);
     GrGLProgram* finalize();
     void bindProgramResourceLocations(GrGLuint programID);
     bool checkLinkStatus(GrGLuint programID);
diff --git a/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp b/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
index bd4921b650..df44edd07e 100644
--- a/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
@@ -44,7 +44,9 @@ GrGLuint GrGLCompileAndAttachShader(const GrGLContext& glCtx,
                                     const char** strings,
                                     int* lengths,
                                     int count,
-                                    GrGpu::Stats* stats) {
+                                    GrGpu::Stats* stats,
+                                    const SkSL::Program::Settings& settings,
+                                    SkSL::Program::Inputs* outInputs) {
     const GrGLInterface* gli = glCtx.interface();
 
     GrGLuint shaderId;
@@ -65,21 +67,20 @@ GrGLuint GrGLCompileAndAttachShader(const GrGLContext& glCtx,
     SkString glsl;
     if (type == GR_GL_VERTEX_SHADER || type == GR_GL_FRAGMENT_SHADER) {
         SkSL::Compiler& compiler = *glCtx.compiler();
-        SkDEBUGCODE(bool result = )compiler.toGLSL(type == GR_GL_VERTEX_SHADER 
-                                                                    ? SkSL::Program::kVertex_Kind
+        std::unique_ptr<SkSL::Program> program;
+        program = compiler.convertProgram(
+                                        type == GR_GL_VERTEX_SHADER ? SkSL::Program::kVertex_Kind
                                                                     : SkSL::Program::kFragment_Kind,
-                                                   sksl,
-                                                   *glCtx.caps()->shaderCaps(),
-                                                   &glsl);
-#ifdef SK_DEBUG
-        if (!result) {
+                                        sksl,
+                                        settings);
+        if (!program || !compiler.toGLSL(*program, &glsl)) {
             SkDebugf("SKSL compilation error\n----------------------\n");
             SkDebugf("SKSL:\n");
             dump_string(sksl);
             SkDebugf("\nErrors:\n%s\n", compiler.errorText().c_str());
             SkDEBUGFAIL("SKSL compilation failed!\n");
         }
-#endif
+        *outInputs = program->fInputs;
     } else {
         // TODO: geometry shader support in sksl.
         SkASSERT(type == GR_GL_GEOMETRY_SHADER);
diff --git a/src/gpu/gl/builders/GrGLShaderStringBuilder.h b/src/gpu/gl/builders/GrGLShaderStringBuilder.h
index 71fce6a95a..242fe617e0 100644
--- a/src/gpu/gl/builders/GrGLShaderStringBuilder.h
+++ b/src/gpu/gl/builders/GrGLShaderStringBuilder.h
@@ -20,6 +20,8 @@ GrGLuint GrGLCompileAndAttachShader(const GrGLContext& glCtx,
                                     const char** strings,
                                     int* lengths,
                                     int count,
-                                    GrGpu::Stats*);
+                                    GrGpu::Stats*,
+                                    const SkSL::Program::Settings& settings,
+                                    SkSL::Program::Inputs* inputs);
 
 #endif