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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrDrawTargetCaps_DEFINED
#define GrDrawTargetCaps_DEFINED
#include "GrTypes.h"
#include "GrTypesPriv.h"
#include "GrShaderVar.h"
#include "SkRefCnt.h"
#include "SkString.h"
/**
* Represents the draw target capabilities.
*/
class GrDrawTargetCaps : public SkRefCnt {
public:
SK_DECLARE_INST_COUNT(GrDrawTargetCaps)
/** Info about shader variable precision within a given shader stage. That is, this info
is relevant to a float (or vecNf) variable declared with a GrShaderVar::Precision
in a given GrShaderType. The info here is hoisted from the OpenGL spec. */
struct PrecisionInfo {
PrecisionInfo() {
fLogRangeLow = 0;
fLogRangeHigh = 0;
fBits = 0;
}
/** Is this precision level allowed in the shader stage? */
bool supported() const { return 0 != fBits; }
bool operator==(const PrecisionInfo& that) const {
return fLogRangeLow == that.fLogRangeLow && fLogRangeHigh == that.fLogRangeHigh &&
fBits == that.fBits;
}
bool operator!=(const PrecisionInfo& that) const { return !(*this == that); }
/** floor(log2(|min_value|)) */
int fLogRangeLow;
/** floor(log2(|max_value|)) */
int fLogRangeHigh;
/** Number of bits of precision. As defined in OpenGL (with names modified to reflect this
struct) :
"""
If the smallest representable value greater than 1 is 1 + e, then fBits will
contain floor(log2(e)), and every value in the range [2^fLogRangeLow,
2^fLogRangeHigh] can be represented to at least one part in 2^fBits.
"""
*/
int fBits;
};
GrDrawTargetCaps() : fUniqueID(CreateUniqueID()) {
this->reset();
}
GrDrawTargetCaps(const GrDrawTargetCaps& other) : INHERITED(), fUniqueID(CreateUniqueID()) {
*this = other;
}
GrDrawTargetCaps& operator= (const GrDrawTargetCaps&);
virtual void reset();
virtual SkString dump() const;
bool npotTextureTileSupport() const { return fNPOTTextureTileSupport; }
/** To avoid as-yet-unnecessary complexity we don't allow any partial support of MIP Maps (e.g.
only for POT textures) */
bool mipMapSupport() const { return fMipMapSupport; }
bool twoSidedStencilSupport() const { return fTwoSidedStencilSupport; }
bool stencilWrapOpsSupport() const { return fStencilWrapOpsSupport; }
bool hwAALineSupport() const { return fHWAALineSupport; }
bool shaderDerivativeSupport() const { return fShaderDerivativeSupport; }
bool geometryShaderSupport() const { return fGeometryShaderSupport; }
bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport; }
bool pathRenderingSupport() const { return fPathRenderingSupport; }
bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
bool discardRenderTargetSupport() const { return fDiscardRenderTargetSupport; }
bool gpuTracingSupport() const { return fGpuTracingSupport; }
bool compressedTexSubImageSupport() const { return fCompressedTexSubImageSupport; }
bool useDrawInsteadOfClear() const { return fUseDrawInsteadOfClear; }
/**
* Indicates whether GPU->CPU memory mapping for GPU resources such as vertex buffers and
* textures allows partial mappings or full mappings.
*/
enum MapFlags {
kNone_MapFlags = 0x0, //<! Cannot map the resource.
kCanMap_MapFlag = 0x1, //<! The resource can be mapped. Must be set for any of
// the other flags to have meaning.k
kSubset_MapFlag = 0x2, //<! The resource can be partially mapped.
};
uint32_t mapBufferFlags() const { return fMapBufferFlags; }
// Scratch textures not being reused means that those scratch textures
// that we upload to (i.e., don't have a render target) will not be
// recycled in the texture cache. This is to prevent ghosting by drivers
// (in particular for deferred architectures).
bool reuseScratchTextures() const { return fReuseScratchTextures; }
int maxRenderTargetSize() const { return fMaxRenderTargetSize; }
int maxTextureSize() const { return fMaxTextureSize; }
// Will be 0 if MSAA is not supported
int maxSampleCount() const { return fMaxSampleCount; }
bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const {
SkASSERT(kGrPixelConfigCnt > config);
return fConfigRenderSupport[config][withMSAA];
}
bool isConfigTexturable(GrPixelConfig config) const {
SkASSERT(kGrPixelConfigCnt > config);
return fConfigTextureSupport[config];
}
/**
* Get the precision info for a variable of type kFloat_GrSLType, kVec2f_GrSLType, etc in a
* given shader type. If the shader type is not supported or the precision level is not
* supported in that shader type then the returned struct will report false when supported() is
* called.
*/
const PrecisionInfo& getFloatShaderPrecisionInfo(GrShaderType shaderType,
GrShaderVar::Precision precision) const {
return fFloatPrecisions[shaderType][precision];
};
/**
* Is there any difference between the float shader variable precision types? If this is true
* then unless the shader type is not supported, any call to getFloatShaderPrecisionInfo() would
* report the same info for all precisions in all shader types.
*/
bool floatPrecisionVaries() const { return fShaderPrecisionVaries; }
/**
* Gets an id that is unique for this GrDrawTargetCaps object. It is static in that it does
* not change when the content of the GrDrawTargetCaps object changes. This will never return
* 0.
*/
uint32_t getUniqueID() const { return fUniqueID; }
protected:
bool fNPOTTextureTileSupport : 1;
bool fMipMapSupport : 1;
bool fTwoSidedStencilSupport : 1;
bool fStencilWrapOpsSupport : 1;
bool fHWAALineSupport : 1;
bool fShaderDerivativeSupport : 1;
bool fGeometryShaderSupport : 1;
bool fDualSourceBlendingSupport : 1;
bool fPathRenderingSupport : 1;
bool fDstReadInShaderSupport : 1;
bool fDiscardRenderTargetSupport: 1;
bool fReuseScratchTextures : 1;
bool fGpuTracingSupport : 1;
bool fCompressedTexSubImageSupport : 1;
// Driver workaround
bool fUseDrawInsteadOfClear : 1;
uint32_t fMapBufferFlags;
int fMaxRenderTargetSize;
int fMaxTextureSize;
int fMaxSampleCount;
// The first entry for each config is without msaa and the second is with.
bool fConfigRenderSupport[kGrPixelConfigCnt][2];
bool fConfigTextureSupport[kGrPixelConfigCnt];
bool fShaderPrecisionVaries;
PrecisionInfo fFloatPrecisions[kGrShaderTypeCount][GrShaderVar::kPrecisionCount];
private:
static uint32_t CreateUniqueID();
const uint32_t fUniqueID;
typedef SkRefCnt INHERITED;
};
#endif
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