101 lines
3.9 KiB
C++
101 lines
3.9 KiB
C++
/*
|
|
* Copyright 2012 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
#ifndef GrTBackendProcessorFactory_DEFINED
|
|
#define GrTBackendProcessorFactory_DEFINED
|
|
|
|
#include "GrBackendProcessorFactory.h"
|
|
|
|
/**
|
|
* Implements GrBackendProcessorFactory for a GrProcessor subclass as a singleton. This can be used
|
|
* by most GrProcessor subclasses to implement the GrProcessor::getFactory() method:
|
|
*
|
|
* const GrBackendProcessorFactory& MyProcessor::getFactory() const {
|
|
* return GrTBackendProcessorFactory<MyProcessor>::getInstance();
|
|
* }
|
|
*
|
|
* Using this class requires that the GrProcessor subclass always produces the same GrGLProcessor
|
|
* subclass. Additionally, it adds the following requirements to the GrProcessor and GrGLProcessor
|
|
* subclasses:
|
|
*
|
|
* 1. The GrGLProcessor used by GrProcessor subclass MyProcessor must be named or typedef'ed to
|
|
* MyProcessor::GLProcessor.
|
|
* 2. MyProcessor::GLProcessor must have a static function:
|
|
void GenKey(const GrProcessor&, const GrGLCaps&, GrProcessorKeyBuilder* b)
|
|
* which generates a key that maps 1 to 1 with code variations emitted by
|
|
* MyProcessor::GLProcessor::emitCode().
|
|
* 3. MyProcessor must have a static function:
|
|
* const char* Name()
|
|
* which returns a human-readable name for the processor.
|
|
*/
|
|
template <class ProcessorClass, class BackEnd, class ProcessorBase, class GLProcessorBase>
|
|
class GrTBackendProcessorFactory : public BackEnd {
|
|
public:
|
|
typedef typename ProcessorClass::GLProcessor GLProcessor;
|
|
|
|
/** Returns a human-readable name for the processor. Implemented using GLProcessor::Name as
|
|
* described in this class's comment. */
|
|
virtual const char* name() const SK_OVERRIDE { return ProcessorClass::Name(); }
|
|
|
|
|
|
/** Implemented using GLProcessor::GenKey as described in this class's comment. */
|
|
virtual void getGLProcessorKey(const GrProcessor& processor,
|
|
const GrGLCaps& caps,
|
|
GrProcessorKeyBuilder* b) const SK_OVERRIDE {
|
|
GLProcessor::GenKey(processor, caps, b);
|
|
}
|
|
|
|
/** Returns a new instance of the appropriate *GL* implementation class
|
|
for the given GrProcessor; caller is responsible for deleting
|
|
the object. */
|
|
virtual GLProcessorBase* createGLInstance(const ProcessorBase& processor) const SK_OVERRIDE {
|
|
return SkNEW_ARGS(GLProcessor, (*this, processor));
|
|
}
|
|
|
|
/** This class is a singleton. This function returns the single instance. */
|
|
static const BackEnd& getInstance() {
|
|
static SkAlignedSTStorage<1, GrTBackendProcessorFactory> gInstanceMem;
|
|
static const GrTBackendProcessorFactory* gInstance;
|
|
if (!gInstance) {
|
|
gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),
|
|
GrTBackendProcessorFactory);
|
|
}
|
|
return *gInstance;
|
|
}
|
|
|
|
protected:
|
|
GrTBackendProcessorFactory() {}
|
|
};
|
|
|
|
/*
|
|
* Every processor so far derives from one of the following subclasses of
|
|
* GrTBackendProcessorFactory. All of this machinery is necessary to ensure that creatGLInstace is
|
|
* typesafe and does not require any casting.
|
|
*/
|
|
template <class ProcessorClass>
|
|
class GrTBackendGeometryProcessorFactory
|
|
: public GrTBackendProcessorFactory<ProcessorClass,
|
|
GrBackendGeometryProcessorFactory,
|
|
GrGeometryProcessor,
|
|
GrGLGeometryProcessor> {
|
|
protected:
|
|
GrTBackendGeometryProcessorFactory() {}
|
|
};
|
|
|
|
template <class ProcessorClass>
|
|
class GrTBackendFragmentProcessorFactory
|
|
: public GrTBackendProcessorFactory<ProcessorClass,
|
|
GrBackendFragmentProcessorFactory,
|
|
GrFragmentProcessor,
|
|
GrGLFragmentProcessor> {
|
|
protected:
|
|
GrTBackendFragmentProcessorFactory() {}
|
|
};
|
|
|
|
|
|
#endif
|