| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "GrGLProgramDesc.h" |
| |
| #include "GrProcessor.h" |
| #include "GrGLGpu.h" |
| #include "GrPipeline.h" |
| #include "SkChecksum.h" |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| |
| /** |
| * Do we need to either map r,g,b->a or a->r. configComponentMask indicates which channels are |
| * 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()) { |
| // Any remapping is handled using texture swizzling not shader modifications. |
| return false; |
| } |
| const char* swizzleMap = caps.getSwizzleMap(config); |
| |
| return SkToBool(memcmp(swizzleMap, "rgba", 4)); |
| } |
| |
| 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; |
| } |
| |
| /** |
| * A function which emits a meta key into the key builder. This is required because shader code may |
| * be dependent on properties of the effect that the effect itself doesn't use |
| * in its key (e.g. the pixel format of textures used). So we create a meta-key for |
| * every effect using this function. It is also responsible for inserting the effect's class ID |
| * which must be different for every GrProcessor subclass. It can fail if an effect uses too many |
| * textures, transforms, etc, for the space allotted in the meta-key. NOTE, both FPs and GPs share |
| * this function because it is hairy, though FPs do not have attribs, and GPs do not have transforms |
| */ |
| static bool gen_meta_key(const GrProcessor& proc, |
| const GrGLCaps& caps, |
| uint32_t transformKey, |
| GrProcessorKeyBuilder* b) { |
| size_t processorKeySize = b->size(); |
| uint32_t textureKey = gen_texture_key(proc, caps); |
| uint32_t classID = proc.classID(); |
| |
| // Currently we allow 16 bits for the class id and the overall processor key size. |
| static const uint32_t kMetaKeyInvalidMask = ~((uint32_t) SK_MaxU16); |
| if ((processorKeySize | classID) & kMetaKeyInvalidMask) { |
| return false; |
| } |
| |
| uint32_t* key = b->add32n(3); |
| key[0] = (classID << 16) | SkToU32(processorKeySize); |
| key[1] = textureKey; |
| key[2] = transformKey; |
| return true; |
| } |
| |
| static bool gen_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 (!gen_frag_proc_and_meta_keys(primProc, fp.childProcessor(i), caps, b)) { |
| return false; |
| } |
| } |
| |
| fp.getGLSLProcessorKey(*caps.glslCaps(), b); |
| |
| //**** use glslCaps here? |
| return gen_meta_key(fp, caps, primProc.getTransformKey(fp.coordTransforms(), |
| fp.numTransformsExclChildren()), b); |
| } |
| |
| bool GrGLProgramDescBuilder::Build(GrProgramDesc* desc, |
| const GrPrimitiveProcessor& primProc, |
| const GrPipeline& pipeline, |
| const GrGLGpu* gpu) { |
| // The descriptor is used as a cache key. Thus when a field of the |
| // descriptor will not affect program generation (because of the attribute |
| // bindings in use or other descriptor field settings) it should be set |
| // to a canonical value to avoid duplicate programs with different keys. |
| |
| GrGLProgramDesc* glDesc = (GrGLProgramDesc*) desc; |
| |
| GR_STATIC_ASSERT(0 == kProcessorKeysOffset % sizeof(uint32_t)); |
| // Make room for everything up to the effect keys. |
| glDesc->key().reset(); |
| glDesc->key().push_back_n(kProcessorKeysOffset); |
| |
| GrProcessorKeyBuilder b(&glDesc->key()); |
| |
| primProc.getGLSLProcessorKey(*gpu->glCaps().glslCaps(), &b); |
| //**** use glslCaps here? |
| if (!gen_meta_key(primProc, gpu->glCaps(), 0, &b)) { |
| glDesc->key().reset(); |
| return false; |
| } |
| |
| for (int i = 0; i < pipeline.numFragmentProcessors(); ++i) { |
| const GrFragmentProcessor& fp = pipeline.getFragmentProcessor(i); |
| if (!gen_frag_proc_and_meta_keys(primProc, fp, gpu->glCaps(), &b)) { |
| glDesc->key().reset(); |
| return false; |
| } |
| } |
| |
| const GrXferProcessor& xp = *pipeline.getXferProcessor(); |
| xp.getGLSLProcessorKey(*gpu->glCaps().glslCaps(), &b); |
| //**** use glslCaps here? |
| if (!gen_meta_key(xp, gpu->glCaps(), 0, &b)) { |
| glDesc->key().reset(); |
| return false; |
| } |
| |
| // --------DO NOT MOVE HEADER ABOVE THIS LINE-------------------------------------------------- |
| // Because header is a pointer into the dynamic array, we can't push any new data into the key |
| // below here. |
| KeyHeader* header = glDesc->atOffset<KeyHeader, kHeaderOffset>(); |
| |
| // make sure any padding in the header is zeroed. |
| memset(header, 0, kHeaderSize); |
| |
| if (pipeline.readsFragPosition()) { |
| header->fFragPosKey = |
| GrGLSLFragmentShaderBuilder::KeyForFragmentPosition(pipeline.getRenderTarget()); |
| } else { |
| header->fFragPosKey = 0; |
| } |
| |
| if (pipeline.ignoresCoverage()) { |
| header->fIgnoresCoverage = 1; |
| } else { |
| header->fIgnoresCoverage = 0; |
| } |
| |
| header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters(); |
| header->fColorEffectCnt = pipeline.numColorFragmentProcessors(); |
| header->fCoverageEffectCnt = pipeline.numCoverageFragmentProcessors(); |
| glDesc->finalize(); |
| return true; |
| } |