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Side by Side Diff: src/gpu/gl/builders/GrGLGeometryShaderBuilder.cpp

Issue 491673002: Initial refactor of shaderbuilder (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 6 years, 4 months ago
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1 /*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "GrGLGeometryShaderBuilder.h"
9 #include "GrGLShaderStringBuilder.h"
10 #include "GrGLProgramBuilder.h"
11 #include "../GrGpuGL.h"
12
13 GrGLGeometryShaderBuilder::GrGLGeometryShaderBuilder(GrGLFullProgramBuilder* pro gram)
14 : INHERITED(program) {
15
16 }
17
18 void GrGLGeometryShaderBuilder::addVarying(GrSLType type,
19 const char* name,
20 const char** gsOutName) {
21 // if we have a GS take each varying in as an array
22 // and output as non-array.
23 fInputs.push_back();
24 fInputs.back().setType(type);
25 fInputs.back().setTypeModifier(GrGLShaderVar::kVaryingIn_TypeModifier);
26 fInputs.back().setUnsizedArray();
27 *fInputs.back().accessName() = name;
28 fOutputs.push_back();
29 fOutputs.back().setType(type);
30 fOutputs.back().setTypeModifier(GrGLShaderVar::kVaryingOut_TypeModifier);
31 fProgramBuilder->nameVariable(fOutputs.back().accessName(), 'g', name);
32 if (gsOutName) {
33 *gsOutName = fOutputs.back().getName().c_str();
34 }
35 }
36
37
38 bool GrGLGeometryShaderBuilder::compileAndAttachShaders(GrGLuint programId,
39 SkTDArray<GrGLuint>* shaderIds) const {
40 const GrGLContext& glCtx = fProgramBuilder->gpu()->glContext();
41 SkASSERT(fProgramBuilder->ctxInfo().glslGeneration() >= k150_GrGLSLGeneratio n);
42 SkString geomShaderSrc(GrGetGLSLVersionDecl(fProgramBuilder->ctxInfo()));
43 geomShaderSrc.append("layout(triangles) in;\n"
44 "layout(triangle_strip, max_vertices = 6) out;\n");
45 fProgramBuilder->appendDecls(fInputs, &geomShaderSrc);
46 fProgramBuilder->appendDecls(fOutputs, &geomShaderSrc);
47 geomShaderSrc.append("void main() {\n");
48 geomShaderSrc.append("\tfor (int i = 0; i < 3; ++i) {\n"
49 "\t\tgl_Position = gl_in[i].gl_Position;\n");
50 if (fProgramBuilder->desc().getHeader().fEmitsPointSize) {
51 geomShaderSrc.append("\t\tgl_PointSize = 1.0;\n");
52 }
53 SkASSERT(fInputs.count() == fOutputs.count());
54 for (int i = 0; i < fInputs.count(); ++i) {
55 geomShaderSrc.appendf("\t\t%s = %s[i];\n",
56 fOutputs[i].getName().c_str(),
57 fInputs[i].getName().c_str());
58 }
59 geomShaderSrc.append("\t\tEmitVertex();\n"
60 "\t}\n"
61 "\tEndPrimitive();\n");
62 geomShaderSrc.append("}\n");
63 GrGLuint geomShaderId =
64 GrGLCompileAndAttachShader(glCtx, programId, GR_GL_GEOMETRY_SHADER, geomShaderSrc);
65 if (!geomShaderId) {
66 return false;
67 }
68 *shaderIds->append() = geomShaderId;
69 return true;
70 }
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