static uint32_t gen_texture_key(const GrProcessor& proc, const GrGLCaps& caps) {
uint32_t key = 0;
int numTextures = proc.numTextures();
int shift = 0;
for (int t = 0; t < numTextures; ++t) {
const GrTextureAccess& access = proc.textureAccess(t);
if (swizzle_requires_alpha_remapping(*caps.glslCaps(), access.getTexture()->config())) {
key |= 1 << shift;
}
if (GR_GL_TEXTURE_EXTERNAL == static_cast<GrGLTexture*>(access.getTexture())->target()) {
key |= 2 << shift;
}
shift += 2;
}
return key;
}
/*
* TODO: A better name for this function would be "compute" instead of "get".
*/
static bool get_frag_proc_and_meta_keys(const GrPrimitiveProcessor& primProc,
const GrFragmentProcessor& fp,
const GrGLCaps& caps,
GrProcessorKeyBuilder* b) {
for (int i = 0; i < fp.numChildProcessors(); ++i) {
if (!get_frag_proc_and_meta_keys(primProc, fp.childProcessor(i), caps, b)) {
return false;
}
}
fp.getGLProcessorKey(*caps.glslCaps(), b);
//**** use glslCaps here?
return get_meta_key(fp, caps, primProc.getTransformKey(fp.coordTransforms(),
fp.numTransformsExclChildren()), b);
}
GrGLFragmentShaderBuilder::DstReadKey
GrGLFragmentShaderBuilder::KeyForDstRead(const GrTexture* dstTexture, const GrGLCaps& caps) {
uint32_t key = kYesDstRead_DstReadKeyBit;
if (caps.glslCaps()->fbFetchSupport()) {
return key;
}
SkASSERT(dstTexture);
if (!caps.textureSwizzleSupport() && GrPixelConfigIsAlphaOnly(dstTexture->config())) {
// The fact that the config is alpha-only must be considered when generating code.
key |= kUseAlphaConfig_DstReadKeyBit;
}
if (kTopLeft_GrSurfaceOrigin == dstTexture->origin()) {
key |= kTopLeftOrigin_DstReadKeyBit;
}
SkASSERT(static_cast<DstReadKey>(key) == key);
return static_cast<DstReadKey>(key);
}
