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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 "GrDefaultGeoProcFactory.h"
#include "GrDrawState.h"
#include "GrInvariantOutput.h"
#include "GrTBackendProcessorFactory.h"
#include "gl/GrGLGeometryProcessor.h"
#include "gl/builders/GrGLProgramBuilder.h"
/*
* The default Geometry Processor simply takes position and multiplies it by the uniform view
* matrix. It also leaves coverage untouched. Behind the scenes, we may add per vertex color or
* local coords.
*/
typedef GrDefaultGeoProcFactory Flag;
class DefaultGeoProc : public GrGeometryProcessor {
public:
static GrGeometryProcessor* Create(uint32_t gpTypeFlags) {
switch (gpTypeFlags) {
case Flag::kColor_GPType | Flag::kCoverage_GPType | Flag::kLocalCoord_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcColLocCov, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcColLocCov);
}
case Flag::kColor_GPType | Flag::kLocalCoord_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcColLoc, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcColLoc);
}
case Flag::kColor_GPType | Flag::kCoverage_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcColCov, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcColCov);
}
case Flag::kColor_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcCol, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcCol);
}
case Flag::kLocalCoord_GPType | Flag::kCoverage_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcLocCov, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcLocCov);
}
case Flag::kLocalCoord_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcLoc, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcLoc);
}
case Flag::kCoverage_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProcCov, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProcCov);
}
case Flag::kPosition_GPType: {
GR_CREATE_STATIC_PROCESSOR(gDefaultGeoProc, DefaultGeoProc, (gpTypeFlags));
return SkRef(gDefaultGeoProc);
}
default:
SkFAIL("Incomplete Switch");
return NULL;
}
}
static const char* Name() { return "DefaultGeometryProcessor"; }
virtual const GrBackendGeometryProcessorFactory& getFactory() const SK_OVERRIDE {
return GrTBackendGeometryProcessorFactory<DefaultGeoProc>::getInstance();
}
const GrAttribute* inPosition() const { return fInPosition; }
const GrAttribute* inColor() const { return fInColor; }
const GrAttribute* inLocalCoords() const { return fInLocalCoords; }
const GrAttribute* inCoverage() const { return fInCoverage; }
class GLProcessor : public GrGLGeometryProcessor {
public:
GLProcessor(const GrBackendProcessorFactory& factory,
const GrGeometryProcessor&,
const GrBatchTracker&)
: INHERITED (factory) {}
virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
GrGLVertexBuilder* vs = args.fPB->getVertexShaderBuilder();
vs->codeAppendf("%s = %s;", vs->positionCoords(), gp.inPosition()->fName);
// Setup pass through color
if (gp.inColor()) {
args.fPB->addPassThroughAttribute(gp.inColor(), args.fOutputColor);
}
// Setup local coords if needed
if (gp.inLocalCoords()) {
vs->codeAppendf("%s = %s;", vs->localCoords(), gp.inLocalCoords()->fName);
} else {
vs->codeAppendf("%s = %s;", vs->localCoords(), gp.inPosition()->fName);
}
// setup position varying
vs->codeAppendf("%s = %s * vec3(%s, 1);", vs->glPosition(), vs->uViewM(),
gp.inPosition()->fName);
// Setup coverage as pass through
GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
fs->codeAppendf("float alpha = 1.0;");
if (gp.inCoverage()) {
args.fPB->addPassThroughAttribute(gp.inCoverage(), "alpha");
}
fs->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage);
}
static inline void GenKey(const GrGeometryProcessor& gp,
const GrBatchTracker&,
const GrGLCaps&,
GrProcessorKeyBuilder* b) {
const DefaultGeoProc& def = gp.cast<DefaultGeoProc>();
b->add32(def.fFlags);
}
virtual void setData(const GrGLProgramDataManager&,
const GrGeometryProcessor&,
const GrBatchTracker&) SK_OVERRIDE {}
private:
typedef GrGLGeometryProcessor INHERITED;
};
private:
DefaultGeoProc(uint32_t gpTypeFlags)
: fInPosition(NULL)
, fInColor(NULL)
, fInLocalCoords(NULL)
, fInCoverage(NULL)
, fFlags(gpTypeFlags) {
bool hasColor = SkToBool(gpTypeFlags & GrDefaultGeoProcFactory::kColor_GPType);
bool hasLocalCoord = SkToBool(gpTypeFlags & GrDefaultGeoProcFactory::kLocalCoord_GPType);
bool hasCoverage = SkToBool(gpTypeFlags & GrDefaultGeoProcFactory::kCoverage_GPType);
fInPosition = &this->addVertexAttrib(GrAttribute("inPosition", kVec2f_GrVertexAttribType));
if (hasColor) {
fInColor = &this->addVertexAttrib(GrAttribute("inColor", kVec4ub_GrVertexAttribType));
this->setHasVertexColor();
}
if (hasLocalCoord) {
fInLocalCoords = &this->addVertexAttrib(GrAttribute("inLocalCoord",
kVec2f_GrVertexAttribType));
this->setHasLocalCoords();
}
if (hasCoverage) {
fInCoverage = &this->addVertexAttrib(GrAttribute("inCoverage",
kFloat_GrVertexAttribType));
this->setHasVertexCoverage();
}
}
virtual bool onIsEqual(const GrGeometryProcessor& other) const SK_OVERRIDE {
const DefaultGeoProc& gp = other.cast<DefaultGeoProc>();
return gp.fFlags == this->fFlags;
}
virtual void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE {
if (fInCoverage) {
inout->mulByUnknownAlpha();
} else {
inout->mulByKnownAlpha(255);
}
}
const GrAttribute* fInPosition;
const GrAttribute* fInColor;
const GrAttribute* fInLocalCoords;
const GrAttribute* fInCoverage;
uint32_t fFlags;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
typedef GrFragmentProcessor INHERITED;
};
GR_DEFINE_GEOMETRY_PROCESSOR_TEST(DefaultGeoProc);
GrGeometryProcessor* DefaultGeoProc::TestCreate(SkRandom* random,
GrContext*,
const GrDrawTargetCaps& caps,
GrTexture*[]) {
uint32_t flags = 0;
if (random->nextBool()) {
flags |= GrDefaultGeoProcFactory::kColor_GPType;
}
if (random->nextBool()) {
flags |= GrDefaultGeoProcFactory::kCoverage_GPType;
}
if (random->nextBool()) {
flags |= GrDefaultGeoProcFactory::kLocalCoord_GPType;
}
return DefaultGeoProc::Create(flags);
}
const GrGeometryProcessor* GrDefaultGeoProcFactory::Create(uint32_t gpTypeFlags) {
return DefaultGeoProc::Create(gpTypeFlags);
}
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