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