Redefine the meaning of sample counts in GPU backend.
Old: 0 -> nonMSAA
1+ -> MSAA
New:
0 -> error/unsupported
1 -> nonMSAA
2+ -> MSAA
We still allow 0 to mean nonMSAA in three sets of public APIs for backwards compatibility:
1) SkSurface factories
2) GrBackendRenderTarget constructors
3) GrCaps::getSampleCnt()'s requestedCount parameter
However, we immediately clamp to 1 and treat 0 as invalid/non-renderable internally.
This also changes the behavior when using a large sample count. We now fail in that case rather than using the largest sample available sample count. GrCaps::getSampleCount() will return 0 in this case.
Bug: skia:
Change-Id: Ida22c6b22c1365e563c9046b611e88bf5eb3ff33
Reviewed-on: https://skia-review.googlesource.com/101560
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrTexture.cpp b/src/gpu/GrTexture.cpp
index b4cefb0..dd06317 100644
--- a/src/gpu/GrTexture.cpp
+++ b/src/gpu/GrTexture.cpp
@@ -78,7 +78,7 @@
void GrTexture::computeScratchKey(GrScratchKey* key) const {
const GrRenderTarget* rt = this->asRenderTarget();
- int sampleCount = 0;
+ int sampleCount = 1;
if (rt) {
sampleCount = rt->numStencilSamples();
}
@@ -92,8 +92,10 @@
GrMipMapped mipMapped, GrScratchKey* key) {
static const GrScratchKey::ResourceType kType = GrScratchKey::GenerateResourceType();
uint32_t flags = isRenderTarget;
-
- SkASSERT(0 == sampleCnt || isRenderTarget);
+ SkASSERT(width > 0);
+ SkASSERT(height > 0);
+ SkASSERT(sampleCnt > 0);
+ SkASSERT(1 == sampleCnt || isRenderTarget);
// make sure desc.fConfig fits in 5 bits
SkASSERT(sk_float_log2(kLast_GrPixelConfig) <= 5);