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      1 /*
      2  * Copyright 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef SF_RENDER_ENGINE_PROGRAMCACHE_H
     18 #define SF_RENDER_ENGINE_PROGRAMCACHE_H
     19 
     20 #include <GLES2/gl2.h>
     21 
     22 #include <utils/Singleton.h>
     23 #include <utils/KeyedVector.h>
     24 #include <utils/TypeHelpers.h>
     25 
     26 #include "Description.h"
     27 
     28 namespace android {
     29 
     30 class Description;
     31 class Program;
     32 class String8;
     33 
     34 /*
     35  * This class generates GLSL programs suitable to handle a given
     36  * Description. It's responsible for figuring out what to
     37  * generate from a Description.
     38  * It also maintains a cache of these Programs.
     39  */
     40 class ProgramCache : public Singleton<ProgramCache> {
     41 public:
     42     /*
     43      * Key is used to retrieve a Program in the cache.
     44      * A Key is generated from a Description.
     45      */
     46     class Key {
     47         friend class ProgramCache;
     48         typedef uint32_t key_t;
     49         key_t mKey;
     50     public:
     51         enum {
     52             BLEND_PREMULT           =       0x00000001,
     53             BLEND_NORMAL            =       0x00000000,
     54             BLEND_MASK              =       0x00000001,
     55 
     56             OPACITY_OPAQUE          =       0x00000002,
     57             OPACITY_TRANSLUCENT     =       0x00000000,
     58             OPACITY_MASK            =       0x00000002,
     59 
     60             PLANE_ALPHA_LT_ONE      =       0x00000004,
     61             PLANE_ALPHA_EQ_ONE      =       0x00000000,
     62             PLANE_ALPHA_MASK        =       0x00000004,
     63 
     64             TEXTURE_OFF             =       0x00000000,
     65             TEXTURE_EXT             =       0x00000008,
     66             TEXTURE_2D              =       0x00000010,
     67             TEXTURE_MASK            =       0x00000018,
     68 
     69             COLOR_MATRIX_OFF        =       0x00000000,
     70             COLOR_MATRIX_ON         =       0x00000020,
     71             COLOR_MATRIX_MASK       =       0x00000020,
     72         };
     73 
     74         inline Key() : mKey(0) { }
     75         inline Key(const Key& rhs) : mKey(rhs.mKey) { }
     76 
     77         inline Key& set(key_t mask, key_t value) {
     78             mKey = (mKey & ~mask) | value;
     79             return *this;
     80         }
     81 
     82         inline bool isTexturing() const {
     83             return (mKey & TEXTURE_MASK) != TEXTURE_OFF;
     84         }
     85         inline int getTextureTarget() const {
     86             return (mKey & TEXTURE_MASK);
     87         }
     88         inline bool isPremultiplied() const {
     89             return (mKey & BLEND_MASK) == BLEND_PREMULT;
     90         }
     91         inline bool isOpaque() const {
     92             return (mKey & OPACITY_MASK) == OPACITY_OPAQUE;
     93         }
     94         inline bool hasPlaneAlpha() const {
     95             return (mKey & PLANE_ALPHA_MASK) == PLANE_ALPHA_LT_ONE;
     96         }
     97         inline bool hasColorMatrix() const {
     98             return (mKey & COLOR_MATRIX_MASK) == COLOR_MATRIX_ON;
     99         }
    100 
    101         // this is the definition of a friend function -- not a method of class Needs
    102         friend inline int strictly_order_type(const Key& lhs, const Key& rhs) {
    103             return  (lhs.mKey < rhs.mKey) ? 1 : 0;
    104         }
    105     };
    106 
    107     ProgramCache();
    108     ~ProgramCache();
    109 
    110     // useProgram lookup a suitable program in the cache or generates one
    111     // if none can be found.
    112     void useProgram(const Description& description);
    113 
    114 private:
    115     // compute a cache Key from a Description
    116     static Key computeKey(const Description& description);
    117     // generates a program from the Key
    118     static Program* generateProgram(const Key& needs);
    119     // generates the vertex shader from the Key
    120     static String8 generateVertexShader(const Key& needs);
    121     // generates the fragment shader from the Key
    122     static String8 generateFragmentShader(const Key& needs);
    123 
    124     // Key/Value map used for caching Programs. Currently the cache
    125     // is never shrunk.
    126     DefaultKeyedVector<Key, Program*> mCache;
    127 };
    128 
    129 
    130 ANDROID_BASIC_TYPES_TRAITS(ProgramCache::Key)
    131 
    132 } /* namespace android */
    133 
    134 #endif /* SF_RENDER_ENGINE_PROGRAMCACHE_H */
    135