blob: 0c28e5228bf3fd8b55d5db90d74ff4f1c9c0ef03 [file] [log] [blame]
/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/glsl/GrGLSLVertexGeoBuilder.h"
#include "include/gpu/GrTypes.h"
#include "src/gpu/glsl/GrGLSLProgramBuilder.h"
#include "src/gpu/glsl/GrGLSLVarying.h"
void GrGLSLVertexGeoBuilder::emitNormalizedSkPosition(SkString* out, const char* devPos,
GrSLType devPosType) {
if (this->getProgramBuilder()->snapVerticesToPixelCenters()) {
if (kFloat3_GrSLType == devPosType) {
const char* p = devPos;
out->appendf("{float2 _posTmp = %s.xy / %s.z;", p, p);
} else {
SkASSERT(kFloat2_GrSLType == devPosType);
out->appendf("{float2 _posTmp = %s;", devPos);
}
out->appendf("_posTmp = floor(_posTmp) + float2(0.5);"
"sk_Position = _posTmp.xy01;}");
} else if (kFloat3_GrSLType == devPosType) {
out->appendf("sk_Position = %s.xy0z;", devPos);
} else {
SkASSERT(kFloat2_GrSLType == devPosType);
out->appendf("sk_Position = %s.xy01;", devPos);
}
}
void GrGLSLVertexBuilder::onFinalize() {
// We could have the GrGeometryProcessor do this, but its just easier to have it performed
// here. If we ever need to set variable pointsize, then we can reinvestigate.
if (this->getProgramBuilder()->hasPointSize()) {
this->codeAppend("sk_PointSize = 1.0;");
}
fProgramBuilder->varyingHandler()->getVertexDecls(&this->inputs(), &this->outputs());
}
static const char* input_type_name(GrGLSLGeometryBuilder::InputType in) {
using InputType = GrGLSLGeometryBuilder::InputType;
switch (in) {
case InputType::kPoints: return "points";
case InputType::kLines: return "lines";
case InputType::kTriangles: return "triangles";
}
SK_ABORT("invalid input type");
}
static const char* output_type_name(GrGLSLGeometryBuilder::OutputType out) {
using OutputType = GrGLSLGeometryBuilder::OutputType;
switch (out) {
case OutputType::kPoints: return "points";
case OutputType::kLineStrip: return "line_strip";
case OutputType::kTriangleStrip: return "triangle_strip";
}
SK_ABORT("invalid output type");
}
void GrGLSLGeometryBuilder::configure(InputType inputType, OutputType outputType, int maxVertices,
int numInvocations) {
SkASSERT(!this->isConfigured());
fNumInvocations = numInvocations;
this->addLayoutQualifier(input_type_name(inputType), kIn_InterfaceQualifier);
this->addLayoutQualifier(SkStringPrintf("invocations = %i", numInvocations).c_str(),
kIn_InterfaceQualifier);
this->addLayoutQualifier(output_type_name(outputType), kOut_InterfaceQualifier);
this->addLayoutQualifier(SkStringPrintf("max_vertices = %i", maxVertices).c_str(),
kOut_InterfaceQualifier);
}
void GrGLSLGeometryBuilder::emitVertex(SkString* out, const char* devPos, GrSLType devPosType) {
this->emitNormalizedSkPosition(out, devPos, devPosType);
out->append("EmitVertex();");
}
void GrGLSLGeometryBuilder::endPrimitive() {
this->codeAppend("EndPrimitive();");
}
void GrGLSLGeometryBuilder::onFinalize() {
SkASSERT(this->isConfigured());
fProgramBuilder->varyingHandler()->getGeomDecls(&this->inputs(), &this->outputs());
}