Initial refactor of shaderbuilder

src/gpu/gl/builders/GrGLGeometryShaderBuilder.cpp

+/*
+ * 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 "GrGLGeometryShaderBuilder.h"
+#include "GrGLShaderStringBuilder.h"
+#include "GrGLProgramBuilder.h"
+#include "../GrGpuGL.h"
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+// public //////////////////////////////////////////////////////////////////////////////////////////
+GrGLGeometryShaderBuilder::GrGLGeometryShaderBuilder(GrGLFullProgramBuilder* program)
+    : INHERITED(program) {
+
+}
+
+// private /////////////////////////////////////////////////////////////////////////////////////////
+void GrGLGeometryShaderBuilder::addVarying(GrSLType type,
+               const char* name,
+               const char** gsOutName) {
+    // if we have a GS take each varying in as an array
+    // and output as non-array.
+    fInputs.push_back();
+    fInputs.back().setType(type);
+    fInputs.back().setTypeModifier(GrGLShaderVar::kVaryingIn_TypeModifier);
+    fInputs.back().setUnsizedArray();
+    *fInputs.back().accessName() = name;
+    fOutputs.push_back();
+    fOutputs.back().setType(type);
+    fOutputs.back().setTypeModifier(GrGLShaderVar::kVaryingOut_TypeModifier);
+    fProgram->nameVariable(fOutputs.back().accessName(), 'g', name);
+    if (gsOutName) {
+        *gsOutName = fOutputs.back().getName().c_str();
+    }
+}
+
+
+bool GrGLGeometryShaderBuilder::compileAndAttachShaders(GrGLuint programId,
+        SkTDArray<GrGLuint>* shaderIds) const {
+    const GrGLContext& glCtx = fProgram->gpu()->glContext();
+    SkASSERT(fProgram->ctxInfo().glslGeneration() >= k150_GrGLSLGeneration);
+    SkString geomShaderSrc(GrGetGLSLVersionDecl(fProgram->ctxInfo()));
+    geomShaderSrc.append("layout(triangles) in;\n"
+                         "layout(triangle_strip, max_vertices = 6) out;\n");
+    fProgram->appendDecls(fInputs, &geomShaderSrc);
+    fProgram->appendDecls(fOutputs, &geomShaderSrc);
+    geomShaderSrc.append("void main() {\n");
+    geomShaderSrc.append("\tfor (int i = 0; i < 3; ++i) {\n"
+                         "\t\tgl_Position = gl_in[i].gl_Position;\n");
+    if (fProgram->desc().getHeader().fEmitsPointSize) {
+        geomShaderSrc.append("\t\tgl_PointSize = 1.0;\n");
+    }
+    SkASSERT(fInputs.count() == fOutputs.count());
+    for (int i = 0; i < fInputs.count(); ++i) {
+        geomShaderSrc.appendf("\t\t%s = %s[i];\n",
+                              fOutputs[i].getName().c_str(),
+                              fInputs[i].getName().c_str());
+    }
+    geomShaderSrc.append("\t\tEmitVertex();\n"
+                         "\t}\n"
+                         "\tEndPrimitive();\n");
+    geomShaderSrc.append("}\n");
+    GrGLuint geomShaderId =
+            GrGLCompileAndAttachShader(glCtx, programId, GR_GL_GEOMETRY_SHADER, geomShaderSrc);
+    if (!geomShaderId) {
+        return false;
+    }
+    *shaderIds->append() = geomShaderId;
+    return true;
+}