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/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SF_RENDER_ENGINE_PROGRAMCACHE_H
#define SF_RENDER_ENGINE_PROGRAMCACHE_H
#include <GLES2/gl2.h>
#include <utils/Singleton.h>
#include <utils/KeyedVector.h>
#include <utils/TypeHelpers.h>
#include "Description.h"
namespace android {
class Description;
class Program;
class String8;
/*
* This class generates GLSL programs suitable to handle a given
* Description. It's responsible for figuring out what to
* generate from a Description.
* It also maintains a cache of these Programs.
*/
class ProgramCache : public Singleton<ProgramCache> {
public:
/*
* Key is used to retrieve a Program in the cache.
* A Key is generated from a Description.
*/
class Key {
friend class ProgramCache;
typedef uint32_t key_t;
key_t mKey;
public:
enum {
BLEND_PREMULT = 0x00000001,
BLEND_NORMAL = 0x00000000,
BLEND_MASK = 0x00000001,
OPACITY_OPAQUE = 0x00000002,
OPACITY_TRANSLUCENT = 0x00000000,
OPACITY_MASK = 0x00000002,
PLANE_ALPHA_LT_ONE = 0x00000004,
PLANE_ALPHA_EQ_ONE = 0x00000000,
PLANE_ALPHA_MASK = 0x00000004,
TEXTURE_OFF = 0x00000000,
TEXTURE_EXT = 0x00000008,
TEXTURE_2D = 0x00000010,
TEXTURE_MASK = 0x00000018,
COLOR_MATRIX_OFF = 0x00000000,
COLOR_MATRIX_ON = 0x00000020,
COLOR_MATRIX_MASK = 0x00000020,
};
inline Key() : mKey(0) { }
inline Key(const Key& rhs) : mKey(rhs.mKey) { }
inline Key& set(key_t mask, key_t value) {
mKey = (mKey & ~mask) | value;
return *this;
}
inline bool isTexturing() const {
return (mKey & TEXTURE_MASK) != TEXTURE_OFF;
}
inline int getTextureTarget() const {
return (mKey & TEXTURE_MASK);
}
inline bool isPremultiplied() const {
return (mKey & BLEND_MASK) == BLEND_PREMULT;
}
inline bool isOpaque() const {
return (mKey & OPACITY_MASK) == OPACITY_OPAQUE;
}
inline bool hasPlaneAlpha() const {
return (mKey & PLANE_ALPHA_MASK) == PLANE_ALPHA_LT_ONE;
}
inline bool hasColorMatrix() const {
return (mKey & COLOR_MATRIX_MASK) == COLOR_MATRIX_ON;
}
// this is the definition of a friend function -- not a method of class Needs
friend inline int strictly_order_type(const Key& lhs, const Key& rhs) {
return (lhs.mKey < rhs.mKey) ? 1 : 0;
}
};
ProgramCache();
~ProgramCache();
// useProgram lookup a suitable program in the cache or generates one
// if none can be found.
void useProgram(const Description& description);
private:
// Generate shaders to populate the cache
void primeCache();
// compute a cache Key from a Description
static Key computeKey(const Description& description);
// generates a program from the Key
static Program* generateProgram(const Key& needs);
// generates the vertex shader from the Key
static String8 generateVertexShader(const Key& needs);
// generates the fragment shader from the Key
static String8 generateFragmentShader(const Key& needs);
// Key/Value map used for caching Programs. Currently the cache
// is never shrunk.
DefaultKeyedVector<Key, Program*> mCache;
};
ANDROID_BASIC_TYPES_TRAITS(ProgramCache::Key)
} /* namespace android */
#endif /* SF_RENDER_ENGINE_PROGRAMCACHE_H */
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