The Tor Browser: gfx/skia/trunk/include/gpu/GrTBackendEffectFactory.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright 2012 Google Inc.

     3  *

     4  * Use of this source code is governed by a BSD-style license that can be

     5  * found in the LICENSE file.

     6  */

     8 #ifndef GrTBackendEffectFactory_DEFINED

     9 #define GrTBackendEffectFactory_DEFINED

    11 #include "GrBackendEffectFactory.h"

    12 #include "GrDrawEffect.h"

    13 #include "gl/GrGLProgramEffects.h"

    15 /**

    16  * Implements GrBackendEffectFactory for a GrEffect subclass as a singleton.

    17  */

    18 template <typename EffectClass>

    19 class GrTBackendEffectFactory : public GrBackendEffectFactory {

    21 public:

    22     typedef typename EffectClass::GLEffect GLEffect;

    24     /** Returns a human-readable name that is accessible via GrEffect or

    25         GrGLEffect and is consistent between the two of them.

    26      */

    27     virtual const char* name() const SK_OVERRIDE { return EffectClass::Name(); }

    29     /** Returns a value that identifies the GLSL shader code generated by

    30         a GrEffect. This enables caching of generated shaders. Part of the

    31         id identifies the GrEffect subclass. The remainder is based

    32         on the aspects of the GrEffect object's configuration that affect

    33         GLSL code generation. */

    34     virtual EffectKey glEffectKey(const GrDrawEffect& drawEffect,

    35                                   const GrGLCaps& caps) const SK_OVERRIDE {

    36         SkASSERT(kIllegalEffectClassID != fEffectClassID);

    37         EffectKey effectKey = GLEffect::GenKey(drawEffect, caps);

    38         EffectKey textureKey = GrGLProgramEffects::GenTextureKey(drawEffect, caps);

    39         EffectKey transformKey = GrGLProgramEffects::GenTransformKey(drawEffect);

    40         EffectKey attribKey = GrGLProgramEffects::GenAttribKey(drawEffect);

    41 #ifdef SK_DEBUG

    42         static const EffectKey kIllegalEffectKeyMask = (uint16_t) (~((1U << kEffectKeyBits) - 1));

    43         SkASSERT(!(kIllegalEffectKeyMask & effectKey));

    45         static const EffectKey kIllegalTextureKeyMask = (uint16_t) (~((1U << kTextureKeyBits) - 1));

    46         SkASSERT(!(kIllegalTextureKeyMask & textureKey));

    48         static const EffectKey kIllegalTransformKeyMask = (uint16_t) (~((1U << kTransformKeyBits) - 1));

    49         SkASSERT(!(kIllegalTransformKeyMask & transformKey));

    51         static const EffectKey kIllegalAttribKeyMask = (uint16_t) (~((1U << kAttribKeyBits) - 1));

    52         SkASSERT(!(kIllegalAttribKeyMask & textureKey));

    54         static const EffectKey kIllegalClassIDMask = (uint16_t) (~((1U << kClassIDBits) - 1));

    55         SkASSERT(!(kIllegalClassIDMask & fEffectClassID));

    56 #endif

    57         return (fEffectClassID << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits+kAttribKeyBits)) |

    58                (attribKey << (kEffectKeyBits+kTextureKeyBits+kTransformKeyBits)) |

    59                (transformKey << (kEffectKeyBits+kTextureKeyBits)) |

    60                (textureKey << kEffectKeyBits) |

    61                (effectKey);

    62     }

    64     /** Returns a new instance of the appropriate *GL* implementation class

    65         for the given GrEffect; caller is responsible for deleting

    66         the object. */

    67     virtual GrGLEffect* createGLInstance(const GrDrawEffect& drawEffect) const SK_OVERRIDE {

    68         return SkNEW_ARGS(GLEffect, (*this, drawEffect));

    69     }

    71     /** This class is a singleton. This function returns the single instance.

    72      */

    73     static const GrBackendEffectFactory& getInstance() {

    74         static SkAlignedSTStorage<1, GrTBackendEffectFactory> gInstanceMem;

    75         static const GrTBackendEffectFactory* gInstance;

    76         if (!gInstance) {

    77             gInstance = SkNEW_PLACEMENT(gInstanceMem.get(),

    78                                         GrTBackendEffectFactory);

    79         }

    80         return *gInstance;

    81     }

    83 protected:

    84     GrTBackendEffectFactory() {

    85         fEffectClassID = GenID();

    86     }

    87 };

    89 #endif

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