src/gpu/GrProgramDesc.cpp - platform/external/skia - Gitiles

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #include "src/gpu/GrProgramDesc.h"

 #include "include/private/SkChecksum.h"
 #include "include/private/SkTo.h"
 #include "src/gpu/GrPipeline.h"
 #include "src/gpu/GrPrimitiveProcessor.h"
 #include "src/gpu/GrProcessor.h"
 #include "src/gpu/GrProgramInfo.h"
 #include "src/gpu/GrRenderTarget.h"
 #include "src/gpu/GrShaderCaps.h"
 #include "src/gpu/GrTexture.h"
 #include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
 #include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"

 enum {
     kSamplerOrImageTypeKeyBits = 4
 };

 static inline uint16_t texture_type_key(GrTextureType type) {
     int value = UINT16_MAX;
     switch (type) {
         case GrTextureType::k2D:
             value = 0;
             break;
         case GrTextureType::kExternal:
             value = 1;
             break;
         case GrTextureType::kRectangle:
             value = 2;
             break;
         default:
             SK_ABORT("Unexpected texture type");
             value = 3;
             break;
     }
     SkASSERT((value & ((1 << kSamplerOrImageTypeKeyBits) - 1)) == value);
     return SkToU16(value);
 }

 static uint32_t sampler_key(GrTextureType textureType, const GrSwizzle& swizzle,
                             const GrCaps& caps) {
     int samplerTypeKey = texture_type_key(textureType);

     static_assert(2 == sizeof(swizzle.asKey()));
     uint16_t swizzleKey = swizzle.asKey();
     return SkToU32(samplerTypeKey | swizzleKey << kSamplerOrImageTypeKeyBits);
 }

 static void add_pp_sampler_keys(GrProcessorKeyBuilder* b, const GrPrimitiveProcessor& pp,
                                 const GrCaps& caps) {
     int numTextureSamplers = pp.numTextureSamplers();
     if (!numTextureSamplers) {
         return;
     }
     for (int i = 0; i < numTextureSamplers; ++i) {
         const GrPrimitiveProcessor::TextureSampler& sampler = pp.textureSampler(i);
         const GrBackendFormat& backendFormat = sampler.backendFormat();

         uint32_t samplerKey = sampler_key(backendFormat.textureType(), sampler.swizzle(), caps);
         b->add32(samplerKey);

         caps.addExtraSamplerKey(b, sampler.samplerState(), backendFormat);
     }
 }

 /**
  * 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_fp_meta_key(const GrFragmentProcessor& fp,
                             const GrCaps& caps,
                             uint32_t transformKey,
                             GrProcessorKeyBuilder* b) {
     size_t processorKeySize = b->size();
     uint32_t classID = fp.classID();

     // Currently we allow 16 bits for the class id and the overall processor key size.
     static const uint32_t kMetaKeyInvalidMask = ~((uint32_t)UINT16_MAX);
     if ((processorKeySize | classID) & kMetaKeyInvalidMask) {
         return false;
     }

     fp.visitTextureEffects([&](const GrTextureEffect& te) {
         const GrBackendFormat& backendFormat = te.view().proxy()->backendFormat();
         uint32_t samplerKey = sampler_key(backendFormat.textureType(), te.view().swizzle(), caps);
         b->add32(samplerKey);
         caps.addExtraSamplerKey(b, te.samplerState(), backendFormat);
     });

     uint32_t* key = b->add32n(2);
     key[0] = (classID << 16) | SkToU32(processorKeySize);
     key[1] = transformKey;
     return true;
 }

 static bool gen_pp_meta_key(const GrPrimitiveProcessor& pp,
                             const GrCaps& caps,
                             uint32_t transformKey,
                             GrProcessorKeyBuilder* b) {
     size_t processorKeySize = b->size();
     uint32_t classID = pp.classID();

     // Currently we allow 16 bits for the class id and the overall processor key size.
     static const uint32_t kMetaKeyInvalidMask = ~((uint32_t)UINT16_MAX);
     if ((processorKeySize | classID) & kMetaKeyInvalidMask) {
         return false;
     }

     add_pp_sampler_keys(b, pp, caps);

     uint32_t* key = b->add32n(2);
     key[0] = (classID << 16) | SkToU32(processorKeySize);
     key[1] = transformKey;
     return true;
 }

 static bool gen_xp_meta_key(const GrXferProcessor& xp, GrProcessorKeyBuilder* b) {
     size_t processorKeySize = b->size();
     uint32_t classID = xp.classID();

     // Currently we allow 16 bits for the class id and the overall processor key size.
     static const uint32_t kMetaKeyInvalidMask = ~((uint32_t)UINT16_MAX);
     if ((processorKeySize | classID) & kMetaKeyInvalidMask) {
         return false;
     }

     b->add32((classID << 16) | SkToU32(processorKeySize));
     return true;
 }

 static bool gen_frag_proc_and_meta_keys(const GrPrimitiveProcessor& primProc,
                                         const GrFragmentProcessor& fp,
                                         const GrCaps& caps,
                                         GrProcessorKeyBuilder* b) {
     for (int i = 0; i < fp.numChildProcessors(); ++i) {
         if (auto child = fp.childProcessor(i)) {
             if (!gen_frag_proc_and_meta_keys(primProc, *child, caps, b)) {
                 return false;
             }
         } else {
             // Fold in a sentinel value as the "class ID" for any null children
             b->add32(GrProcessor::ClassID::kNull_ClassID);
         }
     }

     fp.getGLSLProcessorKey(*caps.shaderCaps(), b);

     return gen_fp_meta_key(fp, caps, primProc.computeCoordTransformsKey(fp), b);
 }

 bool GrProgramDesc::Build(GrProgramDesc* desc,
                           GrRenderTarget* renderTarget,
                           const GrProgramInfo& programInfo,
                           const GrCaps& caps) {
 #ifdef SK_DEBUG
     if (renderTarget) {
         SkASSERT(programInfo.backendFormat() == renderTarget->backendFormat());
     }
 #endif

     // 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.

     static_assert(0 == kProcessorKeysOffset % sizeof(uint32_t));
     // Make room for everything up to the effect keys.
     desc->key().reset();
     desc->key().push_back_n(kProcessorKeysOffset);

     GrProcessorKeyBuilder b(&desc->key());

     const GrPrimitiveProcessor& primitiveProcessor = programInfo.primProc();
     primitiveProcessor.getGLSLProcessorKey(*caps.shaderCaps(), &b);
     primitiveProcessor.getAttributeKey(&b);
     if (!gen_pp_meta_key(primitiveProcessor, caps, 0, &b)) {
         desc->key().reset();
         return false;
     }

     const GrPipeline& pipeline = programInfo.pipeline();
     int numColorFPs = 0, numCoverageFPs = 0;
     for (int i = 0; i < pipeline.numFragmentProcessors(); ++i) {
         const GrFragmentProcessor& fp = pipeline.getFragmentProcessor(i);
         if (!gen_frag_proc_and_meta_keys(primitiveProcessor, fp, caps, &b)) {
             desc->key().reset();
             return false;
         }
         if (pipeline.isColorFragmentProcessor(i)) {
             ++numColorFPs;
         } else if (pipeline.isCoverageFragmentProcessor(i)) {
             ++numCoverageFPs;
         }
     }

     const GrXferProcessor& xp = pipeline.getXferProcessor();
     const GrSurfaceOrigin* originIfDstTexture = nullptr;
     GrSurfaceOrigin origin;
     if (pipeline.dstProxyView().proxy()) {
         origin = pipeline.dstProxyView().origin();
         originIfDstTexture = &origin;
     }
     xp.getGLSLProcessorKey(*caps.shaderCaps(), &b, originIfDstTexture, pipeline.dstSampleType());
     if (!gen_xp_meta_key(xp, &b)) {
         desc->key().reset();
         return false;
     }

     if (programInfo.requestedFeatures() & GrProcessor::CustomFeatures::kSampleLocations) {
         SkASSERT(pipeline.isHWAntialiasState());
         b.add32(renderTarget->getSamplePatternKey());
     }

     // --------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 = desc->atOffset<KeyHeader, kHeaderOffset>();

     // make sure any padding in the header is zeroed.
     memset(header, 0, kHeaderSize);
     header->fWriteSwizzle = pipeline.writeSwizzle().asKey();
     header->fColorFragmentProcessorCnt = numColorFPs;
     header->fCoverageFragmentProcessorCnt = numCoverageFPs;
     SkASSERT(header->fColorFragmentProcessorCnt == numColorFPs);
     SkASSERT(header->fCoverageFragmentProcessorCnt == numCoverageFPs);
     // If we knew the shader won't depend on origin, we could skip this (and use the same program
     // for both origins). Instrumenting all fragment processors would be difficult and error prone.
     header->fSurfaceOriginKey =
                     GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(programInfo.origin());
     header->fProcessorFeatures = (uint8_t)programInfo.requestedFeatures();
     // Ensure enough bits.
     SkASSERT(header->fProcessorFeatures == (int) programInfo.requestedFeatures());
     header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
     // The base descriptor only stores whether or not the primitiveType is kPoints. Backend-
     // specific versions (e.g., Vulkan) require more detail
     header->fHasPointSize = (programInfo.primitiveType() == GrPrimitiveType::kPoints);

     header->fInitialKeyLength = desc->keyLength();
     // Fail if the initial key length won't fit in 27 bits.
     if (header->fInitialKeyLength != desc->keyLength()) {
         desc->key().reset();
         return false;
     }

     return true;
 }
	/*
	* Copyright 2016 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#include "src/gpu/GrProgramDesc.h"

	#include "include/private/SkChecksum.h"
	#include "include/private/SkTo.h"
	#include "src/gpu/GrPipeline.h"
	#include "src/gpu/GrPrimitiveProcessor.h"
	#include "src/gpu/GrProcessor.h"
	#include "src/gpu/GrProgramInfo.h"
	#include "src/gpu/GrRenderTarget.h"
	#include "src/gpu/GrShaderCaps.h"
	#include "src/gpu/GrTexture.h"
	#include "src/gpu/glsl/GrGLSLFragmentProcessor.h"
	#include "src/gpu/glsl/GrGLSLFragmentShaderBuilder.h"

	enum {
	kSamplerOrImageTypeKeyBits = 4
	};

	static inline uint16_t texture_type_key(GrTextureType type) {
	int value = UINT16_MAX;
	switch (type) {
	case GrTextureType::k2D:
	value = 0;
	break;
	case GrTextureType::kExternal:
	value = 1;
	break;
	case GrTextureType::kRectangle:
	value = 2;
	break;
	default:
	SK_ABORT("Unexpected texture type");
	value = 3;
	break;
	}
	SkASSERT((value & ((1 << kSamplerOrImageTypeKeyBits) - 1)) == value);
	return SkToU16(value);
	}

	static uint32_t sampler_key(GrTextureType textureType, const GrSwizzle& swizzle,
	const GrCaps& caps) {
	int samplerTypeKey = texture_type_key(textureType);

	static_assert(2 == sizeof(swizzle.asKey()));
	uint16_t swizzleKey = swizzle.asKey();
	return SkToU32(samplerTypeKey \| swizzleKey << kSamplerOrImageTypeKeyBits);
	}

	static void add_pp_sampler_keys(GrProcessorKeyBuilder* b, const GrPrimitiveProcessor& pp,
	const GrCaps& caps) {
	int numTextureSamplers = pp.numTextureSamplers();
	if (!numTextureSamplers) {
	return;
	}
	for (int i = 0; i < numTextureSamplers; ++i) {
	const GrPrimitiveProcessor::TextureSampler& sampler = pp.textureSampler(i);
	const GrBackendFormat& backendFormat = sampler.backendFormat();

	uint32_t samplerKey = sampler_key(backendFormat.textureType(), sampler.swizzle(), caps);
	b->add32(samplerKey);

	caps.addExtraSamplerKey(b, sampler.samplerState(), backendFormat);
	}
	}

	/**
	* 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_fp_meta_key(const GrFragmentProcessor& fp,
	const GrCaps& caps,
	uint32_t transformKey,
	GrProcessorKeyBuilder* b) {
	size_t processorKeySize = b->size();
	uint32_t classID = fp.classID();

	// Currently we allow 16 bits for the class id and the overall processor key size.
	static const uint32_t kMetaKeyInvalidMask = ~((uint32_t)UINT16_MAX);
	if ((processorKeySize \| classID) & kMetaKeyInvalidMask) {
	return false;
	}

	fp.visitTextureEffects([&](const GrTextureEffect& te) {
	const GrBackendFormat& backendFormat = te.view().proxy()->backendFormat();
	uint32_t samplerKey = sampler_key(backendFormat.textureType(), te.view().swizzle(), caps);
	b->add32(samplerKey);
	caps.addExtraSamplerKey(b, te.samplerState(), backendFormat);
	});

	uint32_t* key = b->add32n(2);
	key[0] = (classID << 16) \| SkToU32(processorKeySize);
	key[1] = transformKey;
	return true;
	}

	static bool gen_pp_meta_key(const GrPrimitiveProcessor& pp,
	const GrCaps& caps,
	uint32_t transformKey,
	GrProcessorKeyBuilder* b) {
	size_t processorKeySize = b->size();
	uint32_t classID = pp.classID();

	// Currently we allow 16 bits for the class id and the overall processor key size.
	static const uint32_t kMetaKeyInvalidMask = ~((uint32_t)UINT16_MAX);
	if ((processorKeySize \| classID) & kMetaKeyInvalidMask) {
	return false;
	}

	add_pp_sampler_keys(b, pp, caps);

	uint32_t* key = b->add32n(2);
	key[0] = (classID << 16) \| SkToU32(processorKeySize);
	key[1] = transformKey;
	return true;
	}

	static bool gen_xp_meta_key(const GrXferProcessor& xp, GrProcessorKeyBuilder* b) {
	size_t processorKeySize = b->size();
	uint32_t classID = xp.classID();

	// Currently we allow 16 bits for the class id and the overall processor key size.
	static const uint32_t kMetaKeyInvalidMask = ~((uint32_t)UINT16_MAX);
	if ((processorKeySize \| classID) & kMetaKeyInvalidMask) {
	return false;
	}

	b->add32((classID << 16) \| SkToU32(processorKeySize));
	return true;
	}

	static bool gen_frag_proc_and_meta_keys(const GrPrimitiveProcessor& primProc,
	const GrFragmentProcessor& fp,
	const GrCaps& caps,
	GrProcessorKeyBuilder* b) {
	for (int i = 0; i < fp.numChildProcessors(); ++i) {
	if (auto child = fp.childProcessor(i)) {
	if (!gen_frag_proc_and_meta_keys(primProc, *child, caps, b)) {
	return false;
	}
	} else {
	// Fold in a sentinel value as the "class ID" for any null children
	b->add32(GrProcessor::ClassID::kNull_ClassID);
	}
	}

	fp.getGLSLProcessorKey(*caps.shaderCaps(), b);

	return gen_fp_meta_key(fp, caps, primProc.computeCoordTransformsKey(fp), b);
	}

	bool GrProgramDesc::Build(GrProgramDesc* desc,
	GrRenderTarget* renderTarget,
	const GrProgramInfo& programInfo,
	const GrCaps& caps) {
	#ifdef SK_DEBUG
	if (renderTarget) {
	SkASSERT(programInfo.backendFormat() == renderTarget->backendFormat());
	}
	#endif

	// 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.

	static_assert(0 == kProcessorKeysOffset % sizeof(uint32_t));
	// Make room for everything up to the effect keys.
	desc->key().reset();
	desc->key().push_back_n(kProcessorKeysOffset);

	GrProcessorKeyBuilder b(&desc->key());

	const GrPrimitiveProcessor& primitiveProcessor = programInfo.primProc();
	primitiveProcessor.getGLSLProcessorKey(*caps.shaderCaps(), &b);
	primitiveProcessor.getAttributeKey(&b);
	if (!gen_pp_meta_key(primitiveProcessor, caps, 0, &b)) {
	desc->key().reset();
	return false;
	}

	const GrPipeline& pipeline = programInfo.pipeline();
	int numColorFPs = 0, numCoverageFPs = 0;
	for (int i = 0; i < pipeline.numFragmentProcessors(); ++i) {
	const GrFragmentProcessor& fp = pipeline.getFragmentProcessor(i);
	if (!gen_frag_proc_and_meta_keys(primitiveProcessor, fp, caps, &b)) {
	desc->key().reset();
	return false;
	}
	if (pipeline.isColorFragmentProcessor(i)) {
	++numColorFPs;
	} else if (pipeline.isCoverageFragmentProcessor(i)) {
	++numCoverageFPs;
	}
	}

	const GrXferProcessor& xp = pipeline.getXferProcessor();
	const GrSurfaceOrigin* originIfDstTexture = nullptr;
	GrSurfaceOrigin origin;
	if (pipeline.dstProxyView().proxy()) {
	origin = pipeline.dstProxyView().origin();
	originIfDstTexture = &origin;
	}
	xp.getGLSLProcessorKey(*caps.shaderCaps(), &b, originIfDstTexture, pipeline.dstSampleType());
	if (!gen_xp_meta_key(xp, &b)) {
	desc->key().reset();
	return false;
	}

	if (programInfo.requestedFeatures() & GrProcessor::CustomFeatures::kSampleLocations) {
	SkASSERT(pipeline.isHWAntialiasState());
	b.add32(renderTarget->getSamplePatternKey());
	}

	// --------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 = desc->atOffset<KeyHeader, kHeaderOffset>();

	// make sure any padding in the header is zeroed.
	memset(header, 0, kHeaderSize);
	header->fWriteSwizzle = pipeline.writeSwizzle().asKey();
	header->fColorFragmentProcessorCnt = numColorFPs;
	header->fCoverageFragmentProcessorCnt = numCoverageFPs;
	SkASSERT(header->fColorFragmentProcessorCnt == numColorFPs);
	SkASSERT(header->fCoverageFragmentProcessorCnt == numCoverageFPs);
	// If we knew the shader won't depend on origin, we could skip this (and use the same program
	// for both origins). Instrumenting all fragment processors would be difficult and error prone.
	header->fSurfaceOriginKey =
	GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(programInfo.origin());
	header->fProcessorFeatures = (uint8_t)programInfo.requestedFeatures();
	// Ensure enough bits.
	SkASSERT(header->fProcessorFeatures == (int) programInfo.requestedFeatures());
	header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
	// The base descriptor only stores whether or not the primitiveType is kPoints. Backend-
	// specific versions (e.g., Vulkan) require more detail
	header->fHasPointSize = (programInfo.primitiveType() == GrPrimitiveType::kPoints);

	header->fInitialKeyLength = desc->keyLength();
	// Fail if the initial key length won't fit in 27 bits.
	if (header->fInitialKeyLength != desc->keyLength()) {
	desc->key().reset();
	return false;
	}

	return true;
	}