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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 "GrGLSLVertexShaderBuilder.h"
#include "glsl/GrGLSLProgramBuilder.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "glsl/GrGLSLVarying.h"
GrGLSLVertexBuilder::GrGLSLVertexBuilder(GrGLSLProgramBuilder* program)
: INHERITED(program)
, fRtAdjustName(nullptr) {
}
void GrGLSLVertexBuilder::transformToNormalizedDeviceSpace(const GrShaderVar& posVar) {
SkASSERT(!fRtAdjustName);
// setup RT Uniform
fProgramBuilder->addRTAdjustmentUniform(kHigh_GrSLPrecision,
fProgramBuilder->rtAdjustment(),
&fRtAdjustName);
if (this->getProgramBuilder()->desc().header().fSnapVerticesToPixelCenters) {
if (kVec3f_GrSLType == posVar.getType()) {
const char* p = posVar.c_str();
this->codeAppendf("{vec2 _posTmp = vec2(%s.x/%s.z, %s.y/%s.z);", p, p, p, p);
} else {
SkASSERT(kVec2f_GrSLType == posVar.getType());
this->codeAppendf("{vec2 _posTmp = %s;", posVar.c_str());
}
this->codeAppendf("_posTmp = floor(_posTmp) + vec2(0.5, 0.5);"
"gl_Position = vec4(_posTmp.x * %s.x + %s.y,"
"_posTmp.y * %s.z + %s.w, 0, 1);}",
fRtAdjustName, fRtAdjustName, fRtAdjustName, fRtAdjustName);
} else if (kVec3f_GrSLType == posVar.getType()) {
this->codeAppendf("gl_Position = vec4(dot(%s.xz, %s.xy), dot(%s.yz, %s.zw), 0, %s.z);",
posVar.c_str(), fRtAdjustName,
posVar.c_str(), fRtAdjustName,
posVar.c_str());
} else {
SkASSERT(kVec2f_GrSLType == posVar.getType());
this->codeAppendf("gl_Position = vec4(%s.x * %s.x + %s.y, %s.y * %s.z + %s.w, 0, 1);",
posVar.c_str(), fRtAdjustName, fRtAdjustName,
posVar.c_str(), fRtAdjustName, fRtAdjustName);
}
// 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()->desc().header().fHasPointSize) {
this->codeAppend("gl_PointSize = 1.0;");
}
}
void GrGLSLVertexBuilder::onFinalize() {
fProgramBuilder->varyingHandler()->getVertexDecls(&this->inputs(), &this->outputs());
}
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