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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 "GrGLVertexShaderBuilder.h"
#include "GrGLProgramBuilder.h"
#include "GrGLShaderStringBuilder.h"
#include "../GrGpuGL.h"
#define GL_CALL(X) GR_GL_CALL(fProgramBuilder->gpu()->glInterface(), X)
#define GL_CALL_RET(R, X) GR_GL_CALL_RET(fProgramBuilder->gpu()->glInterface(), R, X)
static const char* color_attribute_name() { return "inColor"; }
static const char* coverage_attribute_name() { return "inCoverage"; }
GrGLVertexBuilder::GrGLVertexBuilder(GrGLProgramBuilder* program)
: INHERITED(program)
, fPositionVar(NULL)
, fLocalCoordsVar(NULL)
, fRtAdjustName(NULL)
, fEffectAttribOffset(0) {
}
void GrGLVertexBuilder::addVarying(const char* name, GrGLVarying* v) {
fOutputs.push_back();
fOutputs.back().setType(v->fType);
fOutputs.back().setTypeModifier(GrGLShaderVar::kVaryingOut_TypeModifier);
fProgramBuilder->nameVariable(fOutputs.back().accessName(), 'v', name);
v->fVsOut = fOutputs.back().getName().c_str();
}
void GrGLVertexBuilder::setupUniformViewMatrix() {
fProgramBuilder->fUniformHandles.fViewMatrixUni =
fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
kMat33f_GrSLType,
this->uViewM());
}
void GrGLVertexBuilder::setupPositionAndLocalCoords() {
// Setup position
this->codeAppendf("vec3 %s;", this->glPosition());
// setup position and local coords attribute
fPositionVar = &fInputs.push_back();
fPositionVar->set(kVec2f_GrSLType,
GrGLShaderVar::kAttribute_TypeModifier,
this->inPosition());
if (-1 != fProgramBuilder->header().fLocalCoordAttributeIndex) {
fLocalCoordsVar = &fInputs.push_back();
fLocalCoordsVar->set(kVec2f_GrSLType,
GrGLShaderVar::kAttribute_TypeModifier,
"inLocalCoords");
} else {
fLocalCoordsVar = fPositionVar;
}
fEffectAttribOffset = fInputs.count();
}
void GrGLVertexBuilder::setupBuiltinVertexAttribute(const char* inName, GrGLSLExpr1* out) {
GrGLVertToFrag v(kFloat_GrSLType);
fProgramBuilder->addVarying(inName, &v);
SkString name(inName);
name.prepend("in");
this->addAttribute(GrShaderVar(name.c_str(),
kFloat_GrSLType,
GrShaderVar::kAttribute_TypeModifier));
this->codeAppendf("%s = %s;", v.vsOut(), name.c_str());
*out = v.fsIn();
fEffectAttribOffset++;
}
void GrGLVertexBuilder::setupBuiltinVertexAttribute(const char* inName, GrGLSLExpr4* out) {
GrGLVertToFrag v(kVec4f_GrSLType);
fProgramBuilder->addVarying(inName, &v);
SkString name(inName);
name.prepend("in");
this->addAttribute(GrShaderVar(name.c_str(),
kVec4f_GrSLType,
GrShaderVar::kAttribute_TypeModifier));
this->codeAppendf("%s = %s;", v.vsOut(), name.c_str());
*out = v.fsIn();
fEffectAttribOffset++;
}
void GrGLVertexBuilder::emitAttributes(const GrGeometryProcessor& gp) {
const GrGeometryProcessor::VertexAttribArray& vars = gp.getVertexAttribs();
int numAttributes = vars.count();
for (int a = 0; a < numAttributes; ++a) {
this->addAttribute(vars[a]);
}
}
void GrGLVertexBuilder::transformToNormalizedDeviceSpace() {
// setup RT Uniform
fProgramBuilder->fUniformHandles.fRTAdjustmentUni =
fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
kVec4f_GrSLType,
fProgramBuilder->rtAdjustment(),
&fRtAdjustName);
// Wire transforms
SkTArray<GrGLProgramBuilder::TransformVarying, true>& transVs = fProgramBuilder->fCoordVaryings;
int transformCount = transVs.count();
for (int i = 0; i < transformCount; i++) {
const char* coords = transVs[i].fSourceCoords.c_str();
// varying = matrix * coords (logically)
const GrGLVarying& v = transVs[i].fV;
if (kVec2f_GrSLType == v.fType) {
this->codeAppendf("%s = (%s * vec3(%s, 1)).xy;", v.fVsOut, transVs[i].fUniName.c_str(),
coords);
} else {
this->codeAppendf("%s = %s * vec3(%s, 1);", v.fVsOut, transVs[i].fUniName.c_str(),
coords);
}
}
// Transform from Skia's device coords to GL's normalized device coords.
this->codeAppendf("gl_Position = vec4(dot(%s.xz, %s.xy), dot(%s.yz, %s.zw), 0, %s.z);",
this->glPosition(), fRtAdjustName, this->glPosition(), fRtAdjustName,
this->glPosition());
}
void GrGLVertexBuilder::bindVertexAttributes(GrGLuint programID) {
// Bind the attrib locations to same values for all shaders
const GrProgramDesc::KeyHeader& header = fProgramBuilder->header();
SkASSERT(-1 != header.fPositionAttributeIndex);
GL_CALL(BindAttribLocation(programID,
header.fPositionAttributeIndex,
fPositionVar->c_str()));
if (-1 != header.fLocalCoordAttributeIndex) {
GL_CALL(BindAttribLocation(programID,
header.fLocalCoordAttributeIndex,
fLocalCoordsVar->c_str()));
}
if (-1 != header.fColorAttributeIndex) {
GL_CALL(BindAttribLocation(programID,
header.fColorAttributeIndex,
color_attribute_name()));
}
if (-1 != header.fCoverageAttributeIndex) {
GL_CALL(BindAttribLocation(programID,
header.fCoverageAttributeIndex,
coverage_attribute_name()));
}
const GrOptDrawState& optState = fProgramBuilder->optState();
const GrVertexAttrib* vaPtr = optState.getVertexAttribs();
const int vaCount = optState.getVertexAttribCount();
// We start binding attributes after builtins
int i = fEffectAttribOffset;
for (int index = 0; index < vaCount; index++) {
if (kGeometryProcessor_GrVertexAttribBinding != vaPtr[index].fBinding) {
continue;
}
SkASSERT(index != header.fPositionAttributeIndex &&
index != header.fLocalCoordAttributeIndex &&
index != header.fColorAttributeIndex &&
index != header.fCoverageAttributeIndex);
// We should never find another effect attribute if we have bound everything
SkASSERT(i < fInputs.count());
GL_CALL(BindAttribLocation(programID, index, fInputs[i].c_str()));
i++;
}
// Make sure we bound everything
SkASSERT(fInputs.count() == i);
}
bool GrGLVertexBuilder::compileAndAttachShaders(GrGLuint programId,
SkTDArray<GrGLuint>* shaderIds) const {
GrGpuGL* gpu = fProgramBuilder->gpu();
const GrGLContext& glCtx = gpu->glContext();
const GrGLContextInfo& ctxInfo = gpu->ctxInfo();
SkString vertShaderSrc(GrGetGLSLVersionDecl(ctxInfo));
fProgramBuilder->appendUniformDecls(GrGLProgramBuilder::kVertex_Visibility, &vertShaderSrc);
this->appendDecls(fInputs, &vertShaderSrc);
this->appendDecls(fOutputs, &vertShaderSrc);
vertShaderSrc.append("void main() {");
vertShaderSrc.append(fCode);
vertShaderSrc.append("}\n");
GrGLuint vertShaderId = GrGLCompileAndAttachShader(glCtx, programId,
GR_GL_VERTEX_SHADER, vertShaderSrc,
gpu->gpuStats());
if (!vertShaderId) {
return false;
}
*shaderIds->append() = vertShaderId;
return true;
}
bool GrGLVertexBuilder::addAttribute(const GrShaderVar& var) {
SkASSERT(GrShaderVar::kAttribute_TypeModifier == var.getTypeModifier());
for (int i = 0; i < fInputs.count(); ++i) {
const GrGLShaderVar& attr = fInputs[i];
// if attribute already added, don't add it again
if (attr.getName().equals(var.getName())) {
return false;
}
}
fInputs.push_back(var);
return true;
}
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