src/gpu/gl/GrGLProgramDesc.cpp - platform/external/skqp - Gitiles

 /*
  * 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 "GrGLProcessor.h"
 #include "GrProcessor.h"
 #include "GrGpuGL.h"
 #include "GrOptDrawState.h"
 #include "SkChecksum.h"
 #include "gl/builders/GrGLFragmentShaderBuilder.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 GrGLCaps& caps,
                                              uint32_t configComponentMask,
                                              uint32_t swizzleComponentMask) {
     if (caps.textureSwizzleSupport()) {
         // Any remapping is handled using texture swizzling not shader modifications.
         return false;
     }
     // check if the texture is alpha-only
     if (kA_GrColorComponentFlag == configComponentMask) {
         if (caps.textureRedSupport() && (kA_GrColorComponentFlag & swizzleComponentMask)) {
             // we must map the swizzle 'a's to 'r'.
             return true;
         }
         if (kRGB_GrColorComponentFlags & swizzleComponentMask) {
             // The 'r', 'g', and/or 'b's must be mapped to 'a' according to our semantics that
             // alpha-only textures smear alpha across all four channels when read.
             return true;
         }
     }
     return false;
 }

 /**
  * The key for an individual coord transform is made up of a matrix type, a precision, and a bit
  * that indicates the source of the input coords.
  */
 enum {
     kMatrixTypeKeyBits   = 1,
     kMatrixTypeKeyMask   = (1 << kMatrixTypeKeyBits) - 1,

     kPrecisionBits       = 2,
     kPrecisionShift      = kMatrixTypeKeyBits,

     kPositionCoords_Flag = (1 << (kPrecisionShift + kPrecisionBits)),
     kDeviceCoords_Flag   = kPositionCoords_Flag + kPositionCoords_Flag,

     kTransformKeyBits    = kMatrixTypeKeyBits + kPrecisionBits + 2,
 };

 GR_STATIC_ASSERT(kHigh_GrSLPrecision < (1 << kPrecisionBits));

 /**
  * We specialize the vertex code for each of these matrix types.
  */
 enum MatrixType {
     kNoPersp_MatrixType  = 0,
     kGeneral_MatrixType  = 1,
 };

 static uint32_t gen_transform_key(const GrPendingFragmentStage& stage, bool useExplicitLocalCoords) {
     uint32_t totalKey = 0;
     int numTransforms = stage.getProcessor()->numTransforms();
     for (int t = 0; t < numTransforms; ++t) {
         uint32_t key = 0;
         if (stage.isPerspectiveCoordTransform(t)) {
             key |= kGeneral_MatrixType;
         } else {
             key |= kNoPersp_MatrixType;
         }

         const GrCoordTransform& coordTransform = stage.getProcessor()->coordTransform(t);
         if (kLocal_GrCoordSet == coordTransform.sourceCoords() && !useExplicitLocalCoords) {
             key |= kPositionCoords_Flag;
         } else if (kDevice_GrCoordSet == coordTransform.sourceCoords()) {
             key |= kDeviceCoords_Flag;
         }

         GR_STATIC_ASSERT(kGrSLPrecisionCount <= (1 << kPrecisionBits));
         key |= (coordTransform.precision() << kPrecisionShift);

         key <<= kTransformKeyBits * t;

         SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to overlap
         totalKey |= key;
     }
     return totalKey;
 }

 static uint32_t gen_texture_key(const GrProcessor& proc, const GrGLCaps& caps) {
     uint32_t key = 0;
     int numTextures = proc.numTextures();
     for (int t = 0; t < numTextures; ++t) {
         const GrTextureAccess& access = proc.textureAccess(t);
         uint32_t configComponentMask = GrPixelConfigComponentMask(access.getTexture()->config());
         if (swizzle_requires_alpha_remapping(caps, configComponentMask, access.swizzleMask())) {
             key |= 1 << t;
         }
     }
     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 get_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 each of the above portions of the meta-key. Fail if they
     // don't fit.
     static const uint32_t kMetaKeyInvalidMask = ~((uint32_t) SK_MaxU16);
     if ((textureKey | transformKey | classID) & kMetaKeyInvalidMask) {
         return false;
     }
     if (processorKeySize > SK_MaxU16) {
         return false;
     }

     uint32_t* key = b->add32n(2);
     key[0] = (textureKey << 16 | transformKey);
     key[1] = (classID << 16 | SkToU16(processorKeySize));
     return true;
 }

 bool GrGLProgramDescBuilder::Build(const GrOptDrawState& optState,
                                    const GrProgramDesc::DescInfo& descInfo,
                                    GrGpu::DrawType drawType,
                                    GrGLGpu* gpu,
                                    GrProgramDesc* desc) {
     // 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.

     bool requiresLocalCoordAttrib = descInfo.fRequiresLocalCoordAttrib;

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

     GrProcessorKeyBuilder b(&desc->fKey);

     const GrPrimitiveProcessor& primProc = *optState.getPrimitiveProcessor();
     primProc.getGLProcessorKey(optState.getBatchTracker(), gpu->glCaps(), &b);
     if (!get_meta_key(primProc, gpu->glCaps(), 0, &b)) {
         desc->fKey.reset();
         return false;
     }

     for (int s = 0; s < optState.numFragmentStages(); ++s) {
         const GrPendingFragmentStage& fps = optState.getFragmentStage(s);
         const GrFragmentProcessor& fp = *fps.getProcessor();
         fp.getGLProcessorKey(gpu->glCaps(), &b);
         if (!get_meta_key(fp, gpu->glCaps(),
                           gen_transform_key(fps, requiresLocalCoordAttrib), &b)) {
             desc->fKey.reset();
             return false;
         }
     }

     const GrXferProcessor& xp = *optState.getXferProcessor();
     xp.getGLProcessorKey(gpu->glCaps(), &b);
     if (!get_meta_key(xp, gpu->glCaps(), 0, &b)) {
         desc->fKey.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.
     GLKeyHeader* header = desc->atOffset<GLKeyHeader, kHeaderOffset>();

     // make sure any padding in the header is zeroed.
     memset(header, 0, kHeaderSize);

     bool isPathRendering = GrGpu::IsPathRenderingDrawType(drawType);
     if (gpu->caps()->pathRenderingSupport() && isPathRendering) {
         header->fUseNvpr = true;
         SkASSERT(!optState.hasGeometryProcessor());
     } else {
         header->fUseNvpr = false;
     }

     if (descInfo.fReadsDst) {
         const GrDeviceCoordTexture* dstCopy = optState.getDstCopy();
         SkASSERT(dstCopy || gpu->caps()->dstReadInShaderSupport());
         const GrTexture* dstCopyTexture = NULL;
         if (dstCopy) {
             dstCopyTexture = dstCopy->texture();
         }
         header->fDstReadKey = GrGLFragmentShaderBuilder::KeyForDstRead(dstCopyTexture,
                                                                        gpu->glCaps());
         SkASSERT(0 != header->fDstReadKey);
     } else {
         header->fDstReadKey = 0;
     }

     if (descInfo.fReadsFragPosition) {
         header->fFragPosKey =
                 GrGLFragmentShaderBuilder::KeyForFragmentPosition(optState.getRenderTarget(),
                                                                   gpu->glCaps());
     } else {
         header->fFragPosKey = 0;
     }

     header->fColorEffectCnt = optState.numColorStages();
     header->fCoverageEffectCnt = optState.numCoverageStages();
     desc->finalize();
     return true;
 }
	/*
	* 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 "GrGLProcessor.h"
	#include "GrProcessor.h"
	#include "GrGpuGL.h"
	#include "GrOptDrawState.h"
	#include "SkChecksum.h"
	#include "gl/builders/GrGLFragmentShaderBuilder.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 GrGLCaps& caps,
	uint32_t configComponentMask,
	uint32_t swizzleComponentMask) {
	if (caps.textureSwizzleSupport()) {
	// Any remapping is handled using texture swizzling not shader modifications.
	return false;
	}
	// check if the texture is alpha-only
	if (kA_GrColorComponentFlag == configComponentMask) {
	if (caps.textureRedSupport() && (kA_GrColorComponentFlag & swizzleComponentMask)) {
	// we must map the swizzle 'a's to 'r'.
	return true;
	}
	if (kRGB_GrColorComponentFlags & swizzleComponentMask) {
	// The 'r', 'g', and/or 'b's must be mapped to 'a' according to our semantics that
	// alpha-only textures smear alpha across all four channels when read.
	return true;
	}
	}
	return false;
	}

	/**
	* The key for an individual coord transform is made up of a matrix type, a precision, and a bit
	* that indicates the source of the input coords.
	*/
	enum {
	kMatrixTypeKeyBits = 1,
	kMatrixTypeKeyMask = (1 << kMatrixTypeKeyBits) - 1,

	kPrecisionBits = 2,
	kPrecisionShift = kMatrixTypeKeyBits,

	kPositionCoords_Flag = (1 << (kPrecisionShift + kPrecisionBits)),
	kDeviceCoords_Flag = kPositionCoords_Flag + kPositionCoords_Flag,

	kTransformKeyBits = kMatrixTypeKeyBits + kPrecisionBits + 2,
	};

	GR_STATIC_ASSERT(kHigh_GrSLPrecision < (1 << kPrecisionBits));

	/**
	* We specialize the vertex code for each of these matrix types.
	*/
	enum MatrixType {
	kNoPersp_MatrixType = 0,
	kGeneral_MatrixType = 1,
	};

	static uint32_t gen_transform_key(const GrPendingFragmentStage& stage, bool useExplicitLocalCoords) {
	uint32_t totalKey = 0;
	int numTransforms = stage.getProcessor()->numTransforms();
	for (int t = 0; t < numTransforms; ++t) {
	uint32_t key = 0;
	if (stage.isPerspectiveCoordTransform(t)) {
	key \|= kGeneral_MatrixType;
	} else {
	key \|= kNoPersp_MatrixType;
	}

	const GrCoordTransform& coordTransform = stage.getProcessor()->coordTransform(t);
	if (kLocal_GrCoordSet == coordTransform.sourceCoords() && !useExplicitLocalCoords) {
	key \|= kPositionCoords_Flag;
	} else if (kDevice_GrCoordSet == coordTransform.sourceCoords()) {
	key \|= kDeviceCoords_Flag;
	}

	GR_STATIC_ASSERT(kGrSLPrecisionCount <= (1 << kPrecisionBits));
	key \|= (coordTransform.precision() << kPrecisionShift);

	key <<= kTransformKeyBits * t;

	SkASSERT(0 == (totalKey & key)); // keys for each transform ought not to overlap
	totalKey \|= key;
	}
	return totalKey;
	}

	static uint32_t gen_texture_key(const GrProcessor& proc, const GrGLCaps& caps) {
	uint32_t key = 0;
	int numTextures = proc.numTextures();
	for (int t = 0; t < numTextures; ++t) {
	const GrTextureAccess& access = proc.textureAccess(t);
	uint32_t configComponentMask = GrPixelConfigComponentMask(access.getTexture()->config());
	if (swizzle_requires_alpha_remapping(caps, configComponentMask, access.swizzleMask())) {
	key \|= 1 << t;
	}
	}
	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 get_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 each of the above portions of the meta-key. Fail if they
	// don't fit.
	static const uint32_t kMetaKeyInvalidMask = ~((uint32_t) SK_MaxU16);
	if ((textureKey \| transformKey \| classID) & kMetaKeyInvalidMask) {
	return false;
	}
	if (processorKeySize > SK_MaxU16) {
	return false;
	}

	uint32_t* key = b->add32n(2);
	key[0] = (textureKey << 16 \| transformKey);
	key[1] = (classID << 16 \| SkToU16(processorKeySize));
	return true;
	}

	bool GrGLProgramDescBuilder::Build(const GrOptDrawState& optState,
	const GrProgramDesc::DescInfo& descInfo,
	GrGpu::DrawType drawType,
	GrGLGpu* gpu,
	GrProgramDesc* desc) {
	// 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.

	bool requiresLocalCoordAttrib = descInfo.fRequiresLocalCoordAttrib;

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

	GrProcessorKeyBuilder b(&desc->fKey);

	const GrPrimitiveProcessor& primProc = *optState.getPrimitiveProcessor();
	primProc.getGLProcessorKey(optState.getBatchTracker(), gpu->glCaps(), &b);
	if (!get_meta_key(primProc, gpu->glCaps(), 0, &b)) {
	desc->fKey.reset();
	return false;
	}

	for (int s = 0; s < optState.numFragmentStages(); ++s) {
	const GrPendingFragmentStage& fps = optState.getFragmentStage(s);
	const GrFragmentProcessor& fp = *fps.getProcessor();
	fp.getGLProcessorKey(gpu->glCaps(), &b);
	if (!get_meta_key(fp, gpu->glCaps(),
	gen_transform_key(fps, requiresLocalCoordAttrib), &b)) {
	desc->fKey.reset();
	return false;
	}
	}

	const GrXferProcessor& xp = *optState.getXferProcessor();
	xp.getGLProcessorKey(gpu->glCaps(), &b);
	if (!get_meta_key(xp, gpu->glCaps(), 0, &b)) {
	desc->fKey.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.
	GLKeyHeader* header = desc->atOffset<GLKeyHeader, kHeaderOffset>();

	// make sure any padding in the header is zeroed.
	memset(header, 0, kHeaderSize);

	bool isPathRendering = GrGpu::IsPathRenderingDrawType(drawType);
	if (gpu->caps()->pathRenderingSupport() && isPathRendering) {
	header->fUseNvpr = true;
	SkASSERT(!optState.hasGeometryProcessor());
	} else {
	header->fUseNvpr = false;
	}

	if (descInfo.fReadsDst) {
	const GrDeviceCoordTexture* dstCopy = optState.getDstCopy();
	SkASSERT(dstCopy \|\| gpu->caps()->dstReadInShaderSupport());
	const GrTexture* dstCopyTexture = NULL;
	if (dstCopy) {
	dstCopyTexture = dstCopy->texture();
	}
	header->fDstReadKey = GrGLFragmentShaderBuilder::KeyForDstRead(dstCopyTexture,
	gpu->glCaps());
	SkASSERT(0 != header->fDstReadKey);
	} else {
	header->fDstReadKey = 0;
	}

	if (descInfo.fReadsFragPosition) {
	header->fFragPosKey =
	GrGLFragmentShaderBuilder::KeyForFragmentPosition(optState.getRenderTarget(),
	gpu->glCaps());
	} else {
	header->fFragPosKey = 0;
	}

	header->fColorEffectCnt = optState.numColorStages();
	header->fCoverageEffectCnt = optState.numCoverageStages();
	desc->finalize();
	return true;
	}