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/*
* 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"
GrGLGeometryShaderBuilder::GrGLGeometryShaderBuilder(GrGLFullProgramBuilder* program)
: INHERITED(program) {
}
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);
fProgramBuilder->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 = fProgramBuilder->gpu()->glContext();
SkASSERT(fProgramBuilder->ctxInfo().glslGeneration() >= k150_GrGLSLGeneration);
SkString geomShaderSrc(GrGetGLSLVersionDecl(fProgramBuilder->ctxInfo()));
geomShaderSrc.append("layout(triangles) in;\n"
"layout(triangle_strip, max_vertices = 6) out;\n");
fProgramBuilder->appendDecls(fInputs, &geomShaderSrc);
fProgramBuilder->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 (fProgramBuilder->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,
fProgramBuilder->gpu()->gpuStats());
if (!geomShaderId) {
return false;
}
*shaderIds->append() = geomShaderId;
return true;
}
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