104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef GrTextureAccess_DEFINED
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#define GrTextureAccess_DEFINED
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#include "GrGpuResourceRef.h"
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#include "GrTexture.h"
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#include "GrTextureParams.h"
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#include "SkRefCnt.h"
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#include "SkShader.h"
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/** A class representing the swizzle access pattern for a texture. Note that if the texture is
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* an alpha-only texture then the alpha channel is substituted for other components. Any mangling
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* to handle the r,g,b->a conversions for alpha textures is automatically included in the stage
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* key. However, if a GrProcessor uses different swizzles based on its input then it must
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* consider that variation in its key-generation.
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*/
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class GrTextureAccess : public SkNoncopyable {
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public:
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/**
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* A default GrTextureAccess must have reset() called on it in a GrProcessor subclass's
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* constructor if it will be accessible via GrProcessor::textureAccess().
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*/
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GrTextureAccess();
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/**
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* Uses the default swizzle, "rgba".
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*/
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GrTextureAccess(GrTexture*, const GrTextureParams&);
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explicit GrTextureAccess(GrTexture*,
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GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
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SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
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/**
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* swizzle must be a string between one and four (inclusive) characters containing only 'r',
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* 'g', 'b', and/or 'a'.
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*/
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GrTextureAccess(GrTexture*, const char* swizzle, const GrTextureParams&);
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GrTextureAccess(GrTexture*,
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const char* swizzle,
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GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
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SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
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void reset(GrTexture*, const GrTextureParams&);
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void reset(GrTexture*,
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GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
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SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
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void reset(GrTexture*, const char* swizzle, const GrTextureParams&);
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void reset(GrTexture*,
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const char* swizzle,
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GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode,
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SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode);
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bool operator== (const GrTextureAccess& other) const {
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#ifdef SK_DEBUG
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// below assumes all chars in fSwizzle are initialized even if string is < 4 chars long.
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SkASSERT(memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1) ==
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strcmp(fSwizzle, other.fSwizzle));
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#endif
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return fParams == other.fParams &&
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(this->getTexture() == other.getTexture()) &&
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(0 == memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1));
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}
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bool operator!= (const GrTextureAccess& other) const { return !(*this == other); }
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GrTexture* getTexture() const { return fTexture.get(); }
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/**
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* For internal use by GrProcessor.
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*/
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const GrGpuResourceRef* getProgramTexture() const { return &fTexture; }
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/**
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* Returns a string representing the swizzle. The string is is null-terminated.
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*/
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const char* getSwizzle() const { return fSwizzle; }
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/** Returns a mask indicating which components are referenced in the swizzle. The return
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is a bitfield of GrColorComponentFlags. */
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uint32_t swizzleMask() const { return fSwizzleMask; }
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const GrTextureParams& getParams() const { return fParams; }
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private:
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void setSwizzle(const char*);
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typedef GrTGpuResourceRef<GrTexture> ProgramTexture;
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ProgramTexture fTexture;
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GrTextureParams fParams;
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uint32_t fSwizzleMask;
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char fSwizzle[5];
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typedef SkNoncopyable INHERITED;
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};
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#endif
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