Initial refactor of shaderbuilder

src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp

Index: src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp
diff --git a/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp b/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6abc0857060f66fad7f07a353d7884a75a8317cb
--- /dev/null
+++ b/src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp
@@ -0,0 +1,200 @@
+/*
+ * Copyright 2014 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrGLVertexShaderBuilder.h"
+#include "GrGLProgramBuilder.h"
+#include "GrGLShaderStringBuilder.h"
+#include "../GrGpuGL.h"
+
+#define GL_CALL(X) GR_GL_CALL(gpu->glInterface(), X)
+#define GL_CALL_RET(R, X) GR_GL_CALL_RET(gpu->glInterface(), R, X)
+
+namespace {
+inline const char* color_attribute_name() { return "aColor"; }
+inline const char* coverage_attribute_name() { return "aCoverage"; }
+}
+
+GrGLVertexShaderBuilder::GrGLVertexShaderBuilder(GrGLFullProgramBuilder* program)
+    : INHERITED(program)
+    , fPositionVar(NULL)
+    , fLocalCoordsVar(NULL) {
+}
+bool GrGLVertexShaderBuilder::addAttribute(GrSLType type, const char* name) {
+    for (int i = 0; i < fInputs.count(); ++i) {
+        const GrGLShaderVar& attr = fInputs[i];
+        // if attribute already added, don't add it again
+        if (attr.getName().equals(name)) {
+            return false;
+        }
+    }
+    fInputs.push_back().set(type, GrGLShaderVar::kAttribute_TypeModifier, name);
+    return true;
+}
+
+bool GrGLVertexShaderBuilder::addEffectAttribute(int attributeIndex,
+                                               GrSLType type,
+                                               const SkString& name) {
+    if (!this->addAttribute(type, name.c_str())) {
+        return false;
+    }
+
+    fEffectAttributes.push_back().set(attributeIndex, name);
+    return true;
+}
+
+void GrGLVertexShaderBuilder::emitAttributes(const GrEffectStage& stage) {
+    int numAttributes = stage.getVertexAttribIndexCount();
+    const int* attributeIndices = stage.getVertexAttribIndices();
+    for (int a = 0; a < numAttributes; ++a) {
+        // TODO: Make addAttribute mangle the name.
+        SkString attributeName("aAttr");
+        attributeName.appendS32(attributeIndices[a]);
+        this->addEffectAttribute(attributeIndices[a],
+                                 stage.getEffect()->vertexAttribType(a),
+                                 attributeName);
+    }
+}
+
+const SkString* GrGLVertexShaderBuilder::getEffectAttributeName(int attributeIndex) const {
+    const AttributePair* attribEnd = fEffectAttributes.end();
+    for (const AttributePair* attrib = fEffectAttributes.begin(); attrib != attribEnd; ++attrib) {
+        if (attrib->fIndex == attributeIndex) {
+            return &attrib->fName;
+        }
+    }
+
+    return NULL;
+}
+
+void GrGLVertexShaderBuilder::addVarying(GrSLType type, const char* name, const char** vsOutName) {
+    fOutputs.push_back();
+    fOutputs.back().setType(type);
+    fOutputs.back().setTypeModifier(GrGLShaderVar::kVaryingOut_TypeModifier);
+    fProgramBuilder->nameVariable(fOutputs.back().accessName(), 'v', name);
+
+    if (vsOutName) {
+        *vsOutName = fOutputs.back().getName().c_str();
+    }
+}
+
+
+void GrGLVertexShaderBuilder::bindProgramLocations(GrGLuint programId) {
+    const GrGLProgramDesc::KeyHeader& header = fProgramBuilder->desc().getHeader();
+    GrGpuGL* gpu = fProgramBuilder->gpu();
+
+    // Bind the attrib locations to same values for all shaders
+    SkASSERT(-1 != header.fPositionAttributeIndex);
+    GL_CALL(BindAttribLocation(programId,
+                               header.fPositionAttributeIndex,
+                               fPositionVar->c_str()));
+    if (-1 != header.fLocalCoordAttributeIndex) {
+        GL_CALL(BindAttribLocation(programId,
+                                   header.fLocalCoordAttributeIndex,
+                                   fLocalCoordsVar->c_str()));
+    }
+    if (-1 != header.fColorAttributeIndex) {
+        GL_CALL(BindAttribLocation(programId,
+                                   header.fColorAttributeIndex,
+                                   color_attribute_name()));
+    }
+    if (-1 != header.fCoverageAttributeIndex) {
+        GL_CALL(BindAttribLocation(programId,
+                                   header.fCoverageAttributeIndex,
+                                   coverage_attribute_name()));
+    }
+
+    const AttributePair* attribEnd = fEffectAttributes.end();
+    for (const AttributePair* attrib = fEffectAttributes.begin(); attrib != attribEnd; ++attrib) {
+         GL_CALL(BindAttribLocation(programId, attrib->fIndex, attrib->fName.c_str()));
+    }
+}
+
+bool GrGLVertexShaderBuilder::compileAndAttachShaders(GrGLuint programId,
+        SkTDArray<GrGLuint>* shaderIds) const {
+    GrGpuGL* gpu = fProgramBuilder->gpu();
+    const GrGLContext& glCtx = gpu->glContext();
+    const GrGLContextInfo& ctxInfo = gpu->ctxInfo();
+    SkString vertShaderSrc(GrGetGLSLVersionDecl(ctxInfo));
+    fProgramBuilder->appendUniformDecls(GrGLProgramBuilder::kVertex_Visibility, &vertShaderSrc);
+    fProgramBuilder->appendDecls(fInputs, &vertShaderSrc);
+    fProgramBuilder->appendDecls(fOutputs, &vertShaderSrc);
+    vertShaderSrc.append("void main() {\n");
+    vertShaderSrc.append(fCode);
+    vertShaderSrc.append("}\n");
+    GrGLuint vertShaderId = GrGLCompileAndAttachShader(glCtx, programId,
+            GR_GL_VERTEX_SHADER, vertShaderSrc);
+    if (!vertShaderId) {
+        return false;
+    }
+    *shaderIds->append() = vertShaderId;
+    return true;
+}
+
+void GrGLVertexShaderBuilder::emitCodeAfterEffects() {
+    const char* rtAdjustName;
+    fProgramBuilder->fUniformHandles.fRTAdjustmentUni =
+        fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
+                             kVec4f_GrSLType,
+                             "rtAdjustment",
+                             &rtAdjustName);
+
+    // Transform from Skia's device coords to GL's normalized device coords.
+    this->codeAppendf(
+        "\tgl_Position = vec4(dot(pos3.xz, %s.xy), dot(pos3.yz, %s.zw), 0, pos3.z);\n",
+        rtAdjustName, rtAdjustName);
+}
+
+void GrGLVertexShaderBuilder::emitCodeBeforeEffects(GrGLSLExpr4* color, GrGLSLExpr4* coverage) {
+    const GrGLProgramDesc::KeyHeader& header = fProgramBuilder->desc().getHeader();
+
+    fPositionVar = &fInputs.push_back();
+    fPositionVar->set(kVec2f_GrSLType, GrGLShaderVar::kAttribute_TypeModifier, "aPosition");
+    if (-1 != header.fLocalCoordAttributeIndex) {
+        fLocalCoordsVar = &fInputs.push_back();
+        fLocalCoordsVar->set(kVec2f_GrSLType,
+                             GrGLShaderVar::kAttribute_TypeModifier,
+                             "aLocalCoords");
+    } else {
+        fLocalCoordsVar = fPositionVar;
+    }
+
+    const char* viewMName;
+    fProgramBuilder->fUniformHandles.fViewMatrixUni =
+            fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
+                                 kMat33f_GrSLType,
+                                 "ViewM",
+                                 &viewMName);
+
+    // Transform the position into Skia's device coords.
+    this->codeAppendf("\tvec3 pos3 = %s * vec3(%s, 1);\n",
+                      viewMName, fPositionVar->c_str());
+
+    // we output point size in the GS if present
+    if (header.fEmitsPointSize
+#if GR_GL_EXPERIMENTAL_GS
+        && !header.fExperimentalGS
+#endif
+        ) {
+        this->codeAppend("\tgl_PointSize = 1.0;\n");
+    }
+
+    if (GrGLProgramDesc::kAttribute_ColorInput == header.fColorInput) {
+        this->addAttribute(kVec4f_GrSLType, color_attribute_name());
+        const char *vsName, *fsName;
+        fFullProgramBuilder->addVarying(kVec4f_GrSLType, "Color", &vsName, &fsName);
+        this->codeAppendf("\t%s = %s;\n", vsName, color_attribute_name());
+        *color = fsName;
+    }
+
+    if (GrGLProgramDesc::kAttribute_ColorInput == header.fCoverageInput) {
+        this->addAttribute(kVec4f_GrSLType, coverage_attribute_name());
+        const char *vsName, *fsName;
+        fFullProgramBuilder->addVarying(kVec4f_GrSLType, "Coverage", &vsName, &fsName);
+        this->codeAppendf("\t%s = %s;\n", vsName, coverage_attribute_name());
+        *coverage = fsName;
+    }
+}