| /* |
| * 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 "GrPipeline.h" |
| #include "SkChecksum.h" |
| #include "gl/GrGLDefines.h" |
| #include "gl/GrGLTexture.h" |
| #include "gl/GrGLTypes.h" |
| #include "glsl/GrGLSLFragmentProcessor.h" |
| #include "glsl/GrGLSLFragmentShaderBuilder.h" |
| #include "glsl/GrGLSLCaps.h" |
| |
| static uint8_t texture_target_key(GrGLenum target) { |
| switch (target) { |
| case GR_GL_TEXTURE_2D: |
| return 0; |
| case GR_GL_TEXTURE_EXTERNAL: |
| return 1; |
| case GR_GL_TEXTURE_RECTANGLE: |
| return 2; |
| default: |
| SkFAIL("Unexpected texture target."); |
| return 0; |
| } |
| } |
| |
| static void add_texture_key(GrProcessorKeyBuilder* b, const GrProcessor& proc, |
| const GrGLSLCaps& caps) { |
| int numTextures = proc.numTextures(); |
| // Need two bytes per key (swizzle and target). |
| int word32Count = (proc.numTextures() + 1) / 2; |
| if (0 == word32Count) { |
| return; |
| } |
| uint16_t* k16 = SkTCast<uint16_t*>(b->add32n(word32Count)); |
| for (int i = 0; i < numTextures; ++i) { |
| const GrTextureAccess& access = proc.textureAccess(i); |
| GrGLTexture* texture = static_cast<GrGLTexture*>(access.getTexture()); |
| k16[i] = SkToU16(caps.configTextureSwizzle(texture->config()).asKey() | |
| (texture_target_key(texture->target()) << 8)); |
| } |
| // zero the last 16 bits if the number of textures is odd. |
| if (numTextures & 0x1) { |
| k16[numTextures] = 0; |
| } |
| } |
| |
| /** |
| * 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 |
| * 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 GrGLSLCaps& glslCaps, |
| uint32_t transformKey, |
| GrProcessorKeyBuilder* b) { |
| size_t processorKeySize = b->size(); |
| 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; |
| } |
| |
| add_texture_key(b, proc, glslCaps); |
| |
| uint32_t* key = b->add32n(2); |
| key[0] = (classID << 16) | SkToU32(processorKeySize); |
| key[1] = transformKey; |
| return true; |
| } |
| |
| static bool gen_frag_proc_and_meta_keys(const GrPrimitiveProcessor& primProc, |
| const GrFragmentProcessor& fp, |
| const GrGLSLCaps& glslCaps, |
| GrProcessorKeyBuilder* b) { |
| for (int i = 0; i < fp.numChildProcessors(); ++i) { |
| if (!gen_frag_proc_and_meta_keys(primProc, fp.childProcessor(i), glslCaps, b)) { |
| return false; |
| } |
| } |
| |
| fp.getGLSLProcessorKey(glslCaps, b); |
| |
| return gen_meta_key(fp, glslCaps, primProc.getTransformKey(fp.coordTransforms(), |
| fp.numTransformsExclChildren()), b); |
| } |
| |
| bool GrGLProgramDescBuilder::Build(GrProgramDesc* desc, |
| const GrPrimitiveProcessor& primProc, |
| const GrPipeline& pipeline, |
| const GrGLSLCaps& glslCaps) { |
| // 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(glslCaps, &b); |
| if (!gen_meta_key(primProc, glslCaps, 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, glslCaps, &b)) { |
| glDesc->key().reset(); |
| return false; |
| } |
| } |
| |
| const GrXferProcessor& xp = pipeline.getXferProcessor(); |
| xp.getGLSLProcessorKey(glslCaps, &b); |
| if (!gen_meta_key(xp, glslCaps, 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; |
| } |
| |
| header->fOutputSwizzle = |
| glslCaps.configOutputSwizzle(pipeline.getRenderTarget()->config()).asKey(); |
| |
| 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; |
| } |