diff options
Diffstat (limited to 'src/gpu/gl/GrGLProgramDesc.cpp')
-rw-r--r-- | src/gpu/gl/GrGLProgramDesc.cpp | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/src/gpu/gl/GrGLProgramDesc.cpp b/src/gpu/gl/GrGLProgramDesc.cpp index 8ff25575c6..a232a63514 100644 --- a/src/gpu/gl/GrGLProgramDesc.cpp +++ b/src/gpu/gl/GrGLProgramDesc.cpp @@ -18,14 +18,26 @@ * present in the texture's config. swizzleComponentMask indicates the channels present in the * shader swizzle. */ -static bool swizzle_requires_alpha_remapping(const GrGLSLCaps& caps, GrPixelConfig config) { - if (!caps.mustSwizzleInShader()) { +static bool swizzle_requires_alpha_remapping(const GrGLCaps& caps, + uint32_t configComponentMask, + uint32_t swizzleComponentMask) { + if (caps.textureSwizzleSupport()) { // Any remapping is handled using texture swizzling not shader modifications. return false; } - const char* swizzleMap = caps.getSwizzleMap(config); - - return SkToBool(memcmp(swizzleMap, "rgba", 4)); + // check if the texture is alpha-only + if (kA_GrColorComponentFlag == configComponentMask) { + if (caps.textureRedSupport() && (kA_GrColorComponentFlag & swizzleComponentMask)) { + // we must map the swizzle 'a's to 'r'. + return true; + } + if (kRGB_GrColorComponentFlags & swizzleComponentMask) { + // The 'r', 'g', and/or 'b's must be mapped to 'a' according to our semantics that + // alpha-only textures smear alpha across all four channels when read. + return true; + } + } + return false; } static uint32_t gen_texture_key(const GrProcessor& proc, const GrGLCaps& caps) { @@ -33,7 +45,8 @@ static uint32_t gen_texture_key(const GrProcessor& proc, const GrGLCaps& caps) { int numTextures = proc.numTextures(); for (int t = 0; t < numTextures; ++t) { const GrTextureAccess& access = proc.textureAccess(t); - if (swizzle_requires_alpha_remapping(*caps.glslCaps(), access.getTexture()->config())) { + uint32_t configComponentMask = GrPixelConfigComponentMask(access.getTexture()->config()); + if (swizzle_requires_alpha_remapping(caps, configComponentMask, access.swizzleMask())) { key |= 1 << t; } } |