Index: include/gpu/GrTextureAccess.h |
diff --git a/include/gpu/GrTextureAccess.h b/include/gpu/GrTextureAccess.h |
index 124a75aabc065da64c9360592fb5cfeaaf8ca994..e3ded34ff8c54ebb5ee9d5caef890d7ef3a82137 100644 |
--- a/include/gpu/GrTextureAccess.h |
+++ b/include/gpu/GrTextureAccess.h |
@@ -14,33 +14,60 @@ |
#include "SkRefCnt.h" |
#include "SkShader.h" |
-/** |
- * Used to represent a texture that is required by a GrProcessor. It holds a GrTexture along with |
- * an associated GrTextureParams |
+/** A class representing the swizzle access pattern for a texture. Note that if the texture is |
+ * an alpha-only texture then the alpha channel is substituted for other components. Any mangling |
+ * to handle the r,g,b->a conversions for alpha textures is automatically included in the stage |
+ * key. However, if a GrProcessor uses different swizzles based on its input then it must |
+ * consider that variation in its key-generation. |
*/ |
class GrTextureAccess : public SkNoncopyable { |
public: |
/** |
- * Must be initialized before adding to a GrProcessor's texture access list. |
+ * A default GrTextureAccess must have reset() called on it in a GrProcessor subclass's |
+ * constructor if it will be accessible via GrProcessor::textureAccess(). |
*/ |
GrTextureAccess(); |
+ /** |
+ * Uses the default swizzle, "rgba". |
+ */ |
GrTextureAccess(GrTexture*, const GrTextureParams&); |
- |
explicit GrTextureAccess(GrTexture*, |
GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, |
SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
+ |
+ /** |
+ * swizzle must be a string between one and four (inclusive) characters containing only 'r', |
+ * 'g', 'b', and/or 'a'. |
+ */ |
+ GrTextureAccess(GrTexture*, const char* swizzle, const GrTextureParams&); |
+ GrTextureAccess(GrTexture*, |
+ const char* swizzle, |
+ GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, |
+ SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
void reset(GrTexture*, const GrTextureParams&); |
void reset(GrTexture*, |
GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, |
SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
+ void reset(GrTexture*, const char* swizzle, const GrTextureParams&); |
+ void reset(GrTexture*, |
+ const char* swizzle, |
+ GrTextureParams::FilterMode = GrTextureParams::kNone_FilterMode, |
+ SkShader::TileMode tileXAndY = SkShader::kClamp_TileMode); |
- bool operator==(const GrTextureAccess& that) const { |
- return this->getTexture() == that.getTexture() && fParams == that.fParams; |
+ bool operator== (const GrTextureAccess& other) const { |
+#ifdef SK_DEBUG |
+ // below assumes all chars in fSwizzle are initialized even if string is < 4 chars long. |
+ SkASSERT(memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1) == |
+ strcmp(fSwizzle, other.fSwizzle)); |
+#endif |
+ return fParams == other.fParams && |
+ (this->getTexture() == other.getTexture()) && |
+ (0 == memcmp(fSwizzle, other.fSwizzle, sizeof(fSwizzle)-1)); |
} |
- bool operator!=(const GrTextureAccess& other) const { return !(*this == other); } |
+ bool operator!= (const GrTextureAccess& other) const { return !(*this == other); } |
GrTexture* getTexture() const { return fTexture.get(); } |
@@ -49,14 +76,26 @@ |
*/ |
const GrGpuResourceRef* getProgramTexture() const { return &fTexture; } |
+ /** |
+ * Returns a string representing the swizzle. The string is is null-terminated. |
+ */ |
+ const char* getSwizzle() const { return fSwizzle; } |
+ |
+ /** Returns a mask indicating which components are referenced in the swizzle. The return |
+ is a bitfield of GrColorComponentFlags. */ |
+ uint32_t swizzleMask() const { return fSwizzleMask; } |
+ |
const GrTextureParams& getParams() const { return fParams; } |
private: |
+ void setSwizzle(const char*); |
typedef GrTGpuResourceRef<GrTexture> ProgramTexture; |
ProgramTexture fTexture; |
GrTextureParams fParams; |
+ uint32_t fSwizzleMask; |
+ char fSwizzle[5]; |
typedef SkNoncopyable INHERITED; |
}; |