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Unified Diff: include/gpu/GrXferProcessor.h

Issue 900913002: Revert of Revert "Move DstCopy on gpu into the GrXferProcessor." (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 10 months ago
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Index: include/gpu/GrXferProcessor.h
diff --git a/include/gpu/GrXferProcessor.h b/include/gpu/GrXferProcessor.h
index 13e4d2633ff30045b816db20b999744953a20ee7..929eb6b5da298f4956bb71c2531477a14639c049 100644
--- a/include/gpu/GrXferProcessor.h
+++ b/include/gpu/GrXferProcessor.h
@@ -10,6 +10,7 @@
#include "GrColor.h"
#include "GrProcessor.h"
+#include "GrTexture.h"
#include "GrTypes.h"
#include "SkXfermode.h"
@@ -34,11 +35,10 @@
class GrXferProcessor : public GrProcessor {
public:
/**
- * Sets a unique key on the GrProcessorKeyBuilder that is directly associated with this xfer
- * processor's GL backend implementation.
- */
- virtual void getGLProcessorKey(const GrGLCaps& caps,
- GrProcessorKeyBuilder* b) const = 0;
+ * Sets a unique key on the GrProcessorKeyBuilder calls onGetGLProcessorKey(...) to get the
+ * specific subclass's key.
+ */
+ void getGLProcessorKey(const GrGLCaps& caps, GrProcessorKeyBuilder* b) const;
/** Returns a new instance of the appropriate *GL* implementation class
for the given GrXferProcessor; caller is responsible for deleting
@@ -103,8 +103,20 @@
virtual void getBlendInfo(BlendInfo* blendInfo) const = 0;
- /** Will this prceossor read the destination pixel value? */
bool willReadDstColor() const { return fWillReadDstColor; }
+
+ /**
+ * Returns the texture to be used as the destination when reading the dst in the fragment
+ * shader. If the returned texture is NULL then the XP is either not reading the dst or we have
+ * extentions that support framebuffer fetching and thus don't need a copy of the dst texture.
+ */
+ const GrTexture* getDstCopyTexture() const { return fDstCopy.getTexture(); }
+
+ /**
+ * Returns the offset into the DstCopyTexture to use when reading it in the shader. This value
+ * is only valid if getDstCopyTexture() != NULL.
+ */
+ const SkIPoint& dstCopyTextureOffset() const { return fDstCopyTextureOffset; }
/**
* Returns whether or not this xferProcossor will set a secondary output to be used with dual
@@ -123,28 +135,42 @@
if (this->classID() != that.classID()) {
return false;
}
+ if (this->fWillReadDstColor != that.fWillReadDstColor) {
+ return false;
+ }
+ if (this->fDstCopy.getTexture() != that.fDstCopy.getTexture()) {
+ return false;
+ }
+ if (this->fDstCopyTextureOffset != that.fDstCopyTextureOffset) {
+ return false;
+ }
return this->onIsEqual(that);
}
protected:
- GrXferProcessor() : fWillReadDstColor(false) {}
-
- /**
- * If the prceossor subclass will read the destination pixel value then it must call this
- * function from its constructor. Otherwise, when its generated backend-specific prceossor class
- * attempts to generate code that reads the destination pixel it will fail.
- */
- void setWillReadDstColor() { fWillReadDstColor = true; }
+ GrXferProcessor();
+ GrXferProcessor(const GrDeviceCoordTexture* dstCopy, bool willReadDstColor);
private:
+ /**
+ * Sets a unique key on the GrProcessorKeyBuilder that is directly associated with this xfer
+ * processor's GL backend implementation.
+ */
+ virtual void onGetGLProcessorKey(const GrGLCaps& caps,
+ GrProcessorKeyBuilder* b) const = 0;
+
virtual bool onIsEqual(const GrXferProcessor&) const = 0;
- bool fWillReadDstColor;
+ bool fWillReadDstColor;
+ SkIPoint fDstCopyTextureOffset;
+ GrTextureAccess fDstCopy;
typedef GrFragmentProcessor INHERITED;
};
GR_MAKE_BITFIELD_OPS(GrXferProcessor::OptFlags);
+
+///////////////////////////////////////////////////////////////////////////////
/**
* We install a GrXPFactory (XPF) early on in the pipeline before all the final draw information is
@@ -159,8 +185,10 @@
*/
class GrXPFactory : public SkRefCnt {
public:
- virtual GrXferProcessor* createXferProcessor(const GrProcOptInfo& colorPOI,
- const GrProcOptInfo& coveragePOI) const = 0;
+ GrXferProcessor* createXferProcessor(const GrProcOptInfo& colorPOI,
+ const GrProcOptInfo& coveragePOI,
+ const GrDeviceCoordTexture* dstCopy,
+ const GrDrawTargetCaps& caps) const;
/**
* This function returns true if the GrXferProcessor generated from this factory will be able to
@@ -202,10 +230,7 @@
*/
virtual bool canTweakAlphaForCoverage() const = 0;
- /**
- * Returns true if the XP generated by this factory will read dst.
- */
- virtual bool willReadDst() const = 0;
+ bool willNeedDstCopy(const GrDrawTargetCaps& caps) const;
bool isEqual(const GrXPFactory& that) const {
if (this->classID() != that.classID()) {
@@ -232,6 +257,15 @@
uint32_t fClassID;
private:
+ virtual GrXferProcessor* onCreateXferProcessor(const GrProcOptInfo& colorPOI,
+ const GrProcOptInfo& coveragePOI,
+ const GrDeviceCoordTexture* dstCopy) const = 0;
+ /**
+ * Returns true if the XP generated by this factory will explicitly read dst in the fragment
+ * shader.
+ */
+ virtual bool willReadDstColor() const = 0;
+
virtual bool onIsEqual(const GrXPFactory&) const = 0;
static uint32_t GenClassID() {
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