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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 "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(GrColor color, uint8_t coverage, uint32_t gpTypeFlags,
bool opaqueVertexColors) {
return SkNEW_ARGS(DefaultGeoProc, (color, coverage, gpTypeFlags, opaqueVertexColors));
}
virtual const char* name() const SK_OVERRIDE { return "DefaultGeometryProcessor"; }
const GrAttribute* inPosition() const { return fInPosition; }
const GrAttribute* inColor() const { return fInColor; }
const GrAttribute* inLocalCoords() const { return fInLocalCoords; }
const GrAttribute* inCoverage() const { return fInCoverage; }
uint8_t coverage() const { return fCoverage; }
void initBatchTracker(GrBatchTracker* bt, const InitBT& init) const SK_OVERRIDE {
BatchTracker* local = bt->cast<BatchTracker>();
local->fInputColorType = GetColorInputType(&local->fColor, this->color(), init,
SkToBool(fInColor));
bool hasVertexCoverage = SkToBool(fInCoverage) && !init.fCoverageIgnored;
bool covIsSolidWhite = !hasVertexCoverage && 0xff == this->coverage();
if (covIsSolidWhite) {
local->fInputCoverageType = kAllOnes_GrGPInput;
} else if (!hasVertexCoverage) {
local->fInputCoverageType = kUniform_GrGPInput;
local->fCoverage = this->coverage();
} else if (hasVertexCoverage) {
SkASSERT(fInCoverage);
local->fInputCoverageType = kAttribute_GrGPInput;
} else {
local->fInputCoverageType = kIgnored_GrGPInput;
}
local->fUsesLocalCoords = init.fUsesLocalCoords;
}
bool onCanMakeEqual(const GrBatchTracker& m,
const GrGeometryProcessor& that,
const GrBatchTracker& t) const SK_OVERRIDE {
const BatchTracker& mine = m.cast<BatchTracker>();
const BatchTracker& theirs = t.cast<BatchTracker>();
return CanCombineLocalMatrices(*this, mine.fUsesLocalCoords,
that, theirs.fUsesLocalCoords) &&
CanCombineOutput(mine.fInputColorType, mine.fColor,
theirs.fInputColorType, theirs.fColor) &&
CanCombineOutput(mine.fInputCoverageType, mine.fCoverage,
theirs.fInputCoverageType, theirs.fCoverage);
}
class GLProcessor : public GrGLGeometryProcessor {
public:
GLProcessor(const GrGeometryProcessor& gp, const GrBatchTracker&)
: fColor(GrColor_ILLEGAL), fCoverage(0xff) {}
virtual void emitCode(const EmitArgs& args) SK_OVERRIDE {
const DefaultGeoProc& gp = args.fGP.cast<DefaultGeoProc>();
GrGLGPBuilder* pb = args.fPB;
GrGLVertexBuilder* vs = pb->getVertexShaderBuilder();
GrGLGPFragmentBuilder* fs = args.fPB->getFragmentShaderBuilder();
const BatchTracker& local = args.fBT.cast<BatchTracker>();
vs->codeAppendf("%s = %s;", vs->positionCoords(), gp.inPosition()->fName);
// Setup pass through color
this->setupColorPassThrough(pb, local.fInputColorType, args.fOutputColor, gp.inColor(),
&fColorUniform);
// 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
if (kUniform_GrGPInput == local.fInputCoverageType) {
const char* fragCoverage;
fCoverageUniform = pb->addUniform(GrGLProgramBuilder::kFragment_Visibility,
kFloat_GrSLType,
kDefault_GrSLPrecision,
"Coverage",
&fragCoverage);
fs->codeAppendf("%s = vec4(%s);", args.fOutputCoverage, fragCoverage);
} else if (kAttribute_GrGPInput == local.fInputCoverageType) {
SkASSERT(gp.inCoverage());
fs->codeAppendf("float alpha = 1.0;");
args.fPB->addPassThroughAttribute(gp.inCoverage(), "alpha");
fs->codeAppendf("%s = vec4(alpha);", args.fOutputCoverage);
} else if (kAllOnes_GrGPInput == local.fInputCoverageType) {
fs->codeAppendf("%s = vec4(1);", args.fOutputCoverage);
}
}
static inline void GenKey(const GrGeometryProcessor& gp,
const GrBatchTracker& bt,
const GrGLCaps&,
GrProcessorKeyBuilder* b) {
const DefaultGeoProc& def = gp.cast<DefaultGeoProc>();
b->add32(def.fFlags);
const BatchTracker& local = bt.cast<BatchTracker>();
b->add32(local.fInputColorType | local.fInputCoverageType << 16);
}
virtual void setData(const GrGLProgramDataManager& pdman,
const GrPrimitiveProcessor& gp,
const GrBatchTracker& bt) SK_OVERRIDE {
const BatchTracker& local = bt.cast<BatchTracker>();
if (kUniform_GrGPInput == local.fInputColorType && local.fColor != fColor) {
GrGLfloat c[4];
GrColorToRGBAFloat(local.fColor, c);
pdman.set4fv(fColorUniform, 1, c);
fColor = local.fColor;
}
if (kUniform_GrGPInput == local.fInputCoverageType && local.fCoverage != fCoverage) {
pdman.set1f(fCoverageUniform, GrNormalizeByteToFloat(local.fCoverage));
fCoverage = local.fCoverage;
}
}
private:
GrColor fColor;
uint8_t fCoverage;
UniformHandle fColorUniform;
UniformHandle fCoverageUniform;
typedef GrGLGeometryProcessor INHERITED;
};
virtual void getGLProcessorKey(const GrBatchTracker& bt,
const GrGLCaps& caps,
GrProcessorKeyBuilder* b) const SK_OVERRIDE {
GLProcessor::GenKey(*this, bt, caps, b);
}
virtual GrGLGeometryProcessor* createGLInstance(const GrBatchTracker& bt) const SK_OVERRIDE {
return SkNEW_ARGS(GLProcessor, (*this, bt));
}
private:
DefaultGeoProc(GrColor color, uint8_t coverage, uint32_t gpTypeFlags, bool opaqueVertexColors)
: INHERITED(color, opaqueVertexColors)
, fInPosition(NULL)
, fInColor(NULL)
, fInLocalCoords(NULL)
, fInCoverage(NULL)
, fCoverage(coverage)
, fFlags(gpTypeFlags) {
this->initClassID<DefaultGeoProc>();
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));
}
}
virtual bool onIsEqual(const GrGeometryProcessor& other) const SK_OVERRIDE {
const DefaultGeoProc& gp = other.cast<DefaultGeoProc>();
return gp.fFlags == this->fFlags;
}
virtual void onGetInvariantOutputCoverage(GrInitInvariantOutput* out) const SK_OVERRIDE {
if (fInCoverage) {
out->setUnknownSingleComponent();
} else {
// uniform coverage
out->setKnownSingleComponent(this->coverage());
}
}
struct BatchTracker {
GrGPInput fInputColorType;
GrGPInput fInputCoverageType;
GrColor fColor;
GrColor fCoverage;
bool fUsesLocalCoords;
};
const GrAttribute* fInPosition;
const GrAttribute* fInColor;
const GrAttribute* fInLocalCoords;
const GrAttribute* fInCoverage;
uint8_t fCoverage;
uint32_t fFlags;
GR_DECLARE_GEOMETRY_PROCESSOR_TEST;
typedef GrGeometryProcessor 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(GrRandomColor(random), GrRandomCoverage(random),
flags, random->nextBool());
}
const GrGeometryProcessor* GrDefaultGeoProcFactory::Create(GrColor color,
uint32_t gpTypeFlags,
bool opaqueVertexColors,
uint8_t coverage) {
return DefaultGeoProc::Create(color, coverage, gpTypeFlags, opaqueVertexColors);
}
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