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 "GrProgramDesc.h"

 #include "GrPipeline.h"
 #include "GrPrimitiveProcessor.h"
 #include "GrProcessor.h"
 #include "GrRenderTargetPriv.h"
 #include "GrShaderCaps.h"
 #include "GrTexturePriv.h"
 #include "SkChecksum.h"
 #include "SkTo.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "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;
     }
     SkASSERT((value & ((1 << kSamplerOrImageTypeKeyBits) - 1)) == value);
     return SkToU16(value);
 }

 static uint16_t sampler_key(GrTextureType textureType, GrPixelConfig config,
                             const GrShaderCaps& caps) {
     int samplerTypeKey = texture_type_key(textureType);

     GR_STATIC_ASSERT(1 == sizeof(caps.configTextureSwizzle(config).asKey()));
     return SkToU16(samplerTypeKey |
                    caps.configTextureSwizzle(config).asKey() << kSamplerOrImageTypeKeyBits |
                    (GrSLSamplerPrecision(config) << (8 + kSamplerOrImageTypeKeyBits)));
 }

 static void add_sampler_keys(GrProcessorKeyBuilder* b, const GrFragmentProcessor& fp,
                              GrGpu* gpu, const GrShaderCaps& caps) {
     int numTextureSamplers = fp.numTextureSamplers();
     // Need two bytes per key.
     int word32Count = (numTextureSamplers + 1) / 2;
     if (0 == word32Count) {
         return;
     }
     uint16_t* k16 = reinterpret_cast<uint16_t*>(b->add32n(word32Count));
     for (int i = 0; i < numTextureSamplers; ++i) {
         const GrFragmentProcessor::TextureSampler& sampler = fp.textureSampler(i);
         const GrTexture* tex = sampler.peekTexture();
         k16[i] = sampler_key(tex->texturePriv().textureType(), tex->config(), caps);
         uint32_t extraSamplerKey = gpu->getExtraSamplerKeyForProgram(
                 sampler.samplerState(), sampler.proxy()->backendFormat());
         if (extraSamplerKey) {
             SkASSERT(sampler.proxy()->textureType() == GrTextureType::kExternal);
             // We first mark the normal sampler key with last bit to flag that it has an extra
             // sampler key. We then add all the extraSamplerKeys to the end of the normal ones.
             SkASSERT((k16[i] & (1 << 15)) == 0);
             k16[i] = k16[i] | (1 << 15);
             b->add32(extraSamplerKey);
         }
     }
     // zero the last 16 bits if the number of uniforms for samplers is odd.
     if (numTextureSamplers & 0x1) {
         k16[numTextureSamplers] = 0;
     }
 }

 static void add_sampler_keys(GrProcessorKeyBuilder* b, const GrPrimitiveProcessor& pp,
                              const GrShaderCaps& caps) {
     int numTextureSamplers = pp.numTextureSamplers();
     // Need two bytes per key.
     int word32Count = (numTextureSamplers + 1) / 2;
     if (0 == word32Count) {
         return;
     }
     uint16_t* k16 = reinterpret_cast<uint16_t*>(b->add32n(word32Count));
     for (int i = 0; i < numTextureSamplers; ++i) {
         const GrPrimitiveProcessor::TextureSampler& sampler = pp.textureSampler(i);
         k16[i] = sampler_key(sampler.textureType(), sampler.config(), caps);
         uint32_t extraSamplerKey = sampler.extraSamplerKey();
         if (extraSamplerKey) {
             SkASSERT(sampler.textureType() == GrTextureType::kExternal);
             // We first mark the normal sampler key with last bit to flag that it has an extra
             // sampler key. We then add all the extraSamplerKeys to the end of the normal ones.
             SkASSERT((k16[i] & (1 << 15)) == 0);
             k16[i] = k16[i] | (1 << 15);
             b->add32(extraSamplerKey);
         }
     }
     // zero the last 16 bits if the number of uniforms for samplers is odd.
     if (numTextureSamplers & 0x1) {
         k16[numTextureSamplers] = 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 GrFragmentProcessor& fp,
                          GrGpu* gpu,
                          const GrShaderCaps& shaderCaps,
                          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;
     }

     add_sampler_keys(b, fp, gpu, shaderCaps);

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

 static bool gen_meta_key(const GrPrimitiveProcessor& pp,
                          const GrShaderCaps& shaderCaps,
                          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_sampler_keys(b, pp, shaderCaps);

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

 static bool gen_meta_key(const GrXferProcessor& xp,
                          const GrShaderCaps& shaderCaps,
                          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,
                                         GrGpu* gpu,
                                         const GrShaderCaps& shaderCaps,
                                         GrProcessorKeyBuilder* b) {
     for (int i = 0; i < fp.numChildProcessors(); ++i) {
         if (!gen_frag_proc_and_meta_keys(primProc, fp.childProcessor(i), gpu, shaderCaps, b)) {
             return false;
         }
     }

     fp.getGLSLProcessorKey(shaderCaps, b);

     return gen_meta_key(fp, gpu, shaderCaps, primProc.getTransformKey(fp.coordTransforms(),
                                                                       fp.numCoordTransforms()), b);
 }

 bool GrProgramDesc::Build(GrProgramDesc* desc,
                           GrPixelConfig config,
                           const GrPrimitiveProcessor& primProc,
                           bool hasPointSize,
                           const GrPipeline& pipeline,
                           GrGpu* 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.

     const GrShaderCaps& shaderCaps = *gpu->caps()->shaderCaps();

     GR_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());

     primProc.getGLSLProcessorKey(shaderCaps, &b);
     primProc.getAttributeKey(&b);
     if (!gen_meta_key(primProc, shaderCaps, 0, &b)) {
         desc->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, shaderCaps, &b)) {
             desc->key().reset();
             return false;
         }
     }

     const GrXferProcessor& xp = pipeline.getXferProcessor();
     const GrSurfaceOrigin* originIfDstTexture = nullptr;
     GrSurfaceOrigin origin;
     if (pipeline.dstTextureProxy()) {
         origin = pipeline.dstTextureProxy()->origin();
         originIfDstTexture = &origin;
     }
     xp.getGLSLProcessorKey(shaderCaps, &b, originIfDstTexture);
     if (!gen_meta_key(xp, shaderCaps, &b)) {
         desc->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 = desc->atOffset<KeyHeader, kHeaderOffset>();

     // make sure any padding in the header is zeroed.
     memset(header, 0, kHeaderSize);
     header->fOutputSwizzle = shaderCaps.configOutputSwizzle(config).asKey();
     header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
     header->fColorFragmentProcessorCnt = pipeline.numColorFragmentProcessors();
     header->fCoverageFragmentProcessorCnt = pipeline.numCoverageFragmentProcessors();
     // Fail if the client requested more processors than the key can fit.
     if (header->fColorFragmentProcessorCnt != pipeline.numColorFragmentProcessors() ||
         header->fCoverageFragmentProcessorCnt != pipeline.numCoverageFragmentProcessors()) {
         return false;
     }
     header->fHasPointSize = hasPointSize ? 1 : 0;
     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 "GrProgramDesc.h"

	#include "GrPipeline.h"
	#include "GrPrimitiveProcessor.h"
	#include "GrProcessor.h"
	#include "GrRenderTargetPriv.h"
	#include "GrShaderCaps.h"
	#include "GrTexturePriv.h"
	#include "SkChecksum.h"
	#include "SkTo.h"
	#include "glsl/GrGLSLFragmentProcessor.h"
	#include "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;
	}
	SkASSERT((value & ((1 << kSamplerOrImageTypeKeyBits) - 1)) == value);
	return SkToU16(value);
	}

	static uint16_t sampler_key(GrTextureType textureType, GrPixelConfig config,
	const GrShaderCaps& caps) {
	int samplerTypeKey = texture_type_key(textureType);

	GR_STATIC_ASSERT(1 == sizeof(caps.configTextureSwizzle(config).asKey()));
	return SkToU16(samplerTypeKey \|
	caps.configTextureSwizzle(config).asKey() << kSamplerOrImageTypeKeyBits \|
	(GrSLSamplerPrecision(config) << (8 + kSamplerOrImageTypeKeyBits)));
	}

	static void add_sampler_keys(GrProcessorKeyBuilder* b, const GrFragmentProcessor& fp,
	GrGpu* gpu, const GrShaderCaps& caps) {
	int numTextureSamplers = fp.numTextureSamplers();
	// Need two bytes per key.
	int word32Count = (numTextureSamplers + 1) / 2;
	if (0 == word32Count) {
	return;
	}
	uint16_t* k16 = reinterpret_cast<uint16_t*>(b->add32n(word32Count));
	for (int i = 0; i < numTextureSamplers; ++i) {
	const GrFragmentProcessor::TextureSampler& sampler = fp.textureSampler(i);
	const GrTexture* tex = sampler.peekTexture();
	k16[i] = sampler_key(tex->texturePriv().textureType(), tex->config(), caps);
	uint32_t extraSamplerKey = gpu->getExtraSamplerKeyForProgram(
	sampler.samplerState(), sampler.proxy()->backendFormat());
	if (extraSamplerKey) {
	SkASSERT(sampler.proxy()->textureType() == GrTextureType::kExternal);
	// We first mark the normal sampler key with last bit to flag that it has an extra
	// sampler key. We then add all the extraSamplerKeys to the end of the normal ones.
	SkASSERT((k16[i] & (1 << 15)) == 0);
	k16[i] = k16[i] \| (1 << 15);
	b->add32(extraSamplerKey);
	}
	}
	// zero the last 16 bits if the number of uniforms for samplers is odd.
	if (numTextureSamplers & 0x1) {
	k16[numTextureSamplers] = 0;
	}
	}

	static void add_sampler_keys(GrProcessorKeyBuilder* b, const GrPrimitiveProcessor& pp,
	const GrShaderCaps& caps) {
	int numTextureSamplers = pp.numTextureSamplers();
	// Need two bytes per key.
	int word32Count = (numTextureSamplers + 1) / 2;
	if (0 == word32Count) {
	return;
	}
	uint16_t* k16 = reinterpret_cast<uint16_t*>(b->add32n(word32Count));
	for (int i = 0; i < numTextureSamplers; ++i) {
	const GrPrimitiveProcessor::TextureSampler& sampler = pp.textureSampler(i);
	k16[i] = sampler_key(sampler.textureType(), sampler.config(), caps);
	uint32_t extraSamplerKey = sampler.extraSamplerKey();
	if (extraSamplerKey) {
	SkASSERT(sampler.textureType() == GrTextureType::kExternal);
	// We first mark the normal sampler key with last bit to flag that it has an extra
	// sampler key. We then add all the extraSamplerKeys to the end of the normal ones.
	SkASSERT((k16[i] & (1 << 15)) == 0);
	k16[i] = k16[i] \| (1 << 15);
	b->add32(extraSamplerKey);
	}
	}
	// zero the last 16 bits if the number of uniforms for samplers is odd.
	if (numTextureSamplers & 0x1) {
	k16[numTextureSamplers] = 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 GrFragmentProcessor& fp,
	GrGpu* gpu,
	const GrShaderCaps& shaderCaps,
	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;
	}

	add_sampler_keys(b, fp, gpu, shaderCaps);

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

	static bool gen_meta_key(const GrPrimitiveProcessor& pp,
	const GrShaderCaps& shaderCaps,
	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_sampler_keys(b, pp, shaderCaps);

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

	static bool gen_meta_key(const GrXferProcessor& xp,
	const GrShaderCaps& shaderCaps,
	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,
	GrGpu* gpu,
	const GrShaderCaps& shaderCaps,
	GrProcessorKeyBuilder* b) {
	for (int i = 0; i < fp.numChildProcessors(); ++i) {
	if (!gen_frag_proc_and_meta_keys(primProc, fp.childProcessor(i), gpu, shaderCaps, b)) {
	return false;
	}
	}

	fp.getGLSLProcessorKey(shaderCaps, b);

	return gen_meta_key(fp, gpu, shaderCaps, primProc.getTransformKey(fp.coordTransforms(),
	fp.numCoordTransforms()), b);
	}

	bool GrProgramDesc::Build(GrProgramDesc* desc,
	GrPixelConfig config,
	const GrPrimitiveProcessor& primProc,
	bool hasPointSize,
	const GrPipeline& pipeline,
	GrGpu* 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.

	const GrShaderCaps& shaderCaps = *gpu->caps()->shaderCaps();

	GR_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());

	primProc.getGLSLProcessorKey(shaderCaps, &b);
	primProc.getAttributeKey(&b);
	if (!gen_meta_key(primProc, shaderCaps, 0, &b)) {
	desc->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, shaderCaps, &b)) {
	desc->key().reset();
	return false;
	}
	}

	const GrXferProcessor& xp = pipeline.getXferProcessor();
	const GrSurfaceOrigin* originIfDstTexture = nullptr;
	GrSurfaceOrigin origin;
	if (pipeline.dstTextureProxy()) {
	origin = pipeline.dstTextureProxy()->origin();
	originIfDstTexture = &origin;
	}
	xp.getGLSLProcessorKey(shaderCaps, &b, originIfDstTexture);
	if (!gen_meta_key(xp, shaderCaps, &b)) {
	desc->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 = desc->atOffset<KeyHeader, kHeaderOffset>();

	// make sure any padding in the header is zeroed.
	memset(header, 0, kHeaderSize);
	header->fOutputSwizzle = shaderCaps.configOutputSwizzle(config).asKey();
	header->fSnapVerticesToPixelCenters = pipeline.snapVerticesToPixelCenters();
	header->fColorFragmentProcessorCnt = pipeline.numColorFragmentProcessors();
	header->fCoverageFragmentProcessorCnt = pipeline.numCoverageFragmentProcessors();
	// Fail if the client requested more processors than the key can fit.
	if (header->fColorFragmentProcessorCnt != pipeline.numColorFragmentProcessors() \|\|
	header->fCoverageFragmentProcessorCnt != pipeline.numCoverageFragmentProcessors()) {
	return false;
	}
	header->fHasPointSize = hasPointSize ? 1 : 0;
	return true;
	}