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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 "GrGLSLGeometryShaderBuilder.h"
      9 #include "GrGLSLProgramBuilder.h"
     10 #include "GrGLSLVarying.h"
     11 
     12 static const char* input_type_name(GrGLSLGeometryBuilder::InputType in) {
     13     using InputType = GrGLSLGeometryBuilder::InputType;
     14     switch (in) {
     15         case InputType::kPoints: return "points";
     16         case InputType::kLines: return "lines";
     17         case InputType::kLinesAdjacency: return "lines_adjacency";
     18         case InputType::kTriangles: return "triangles";
     19         case InputType::kTrianglesAdjacency: return "triangles_adjacency";
     20     }
     21     SkFAIL("invalid input type");
     22     return "unknown_input";
     23 }
     24 
     25 static const char* output_type_name(GrGLSLGeometryBuilder::OutputType out) {
     26     using OutputType = GrGLSLGeometryBuilder::OutputType;
     27     switch (out) {
     28         case OutputType::kPoints: return "points";
     29         case OutputType::kLineStrip: return "line_strip";
     30         case OutputType::kTriangleStrip: return "triangle_strip";
     31     }
     32     SkFAIL("invalid output type");
     33     return "unknown_output";
     34 }
     35 
     36 GrGLSLGeometryBuilder::GrGLSLGeometryBuilder(GrGLSLProgramBuilder* program)
     37     : INHERITED(program)
     38     , fNumInvocations(0) {
     39 }
     40 
     41 void GrGLSLGeometryBuilder::configure(InputType inputType, OutputType outputType, int maxVertices,
     42                                       int numInvocations) {
     43     SkASSERT(!this->isConfigured());
     44     fNumInvocations = numInvocations;
     45     this->addLayoutQualifier(input_type_name(inputType), kIn_InterfaceQualifier);
     46     this->addLayoutQualifier(SkStringPrintf("invocations = %i", numInvocations).c_str(),
     47                              kIn_InterfaceQualifier);
     48     this->addLayoutQualifier(output_type_name(outputType), kOut_InterfaceQualifier);
     49     this->addLayoutQualifier(SkStringPrintf("max_vertices = %i", maxVertices).c_str(),
     50                              kOut_InterfaceQualifier);
     51 }
     52 
     53 void GrGLSLGeometryBuilder::onFinalize() {
     54     SkASSERT(this->isConfigured());
     55     fProgramBuilder->varyingHandler()->getGeomDecls(&this->inputs(), &this->outputs());
     56 }
     57