RenderEngine.h revision d555684cb36dfb959694db76962e570184f98838 
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
18#ifndef SF_RENDERENGINE_H_
19#define SF_RENDERENGINE_H_
20
21#include <stdint.h>
22#include <sys/types.h>
23
24#include <EGL/egl.h>
25#include <EGL/eglext.h>
26#include <ui/mat4.h>
27
28// ---------------------------------------------------------------------------
29namespace android {
30// ---------------------------------------------------------------------------
31
32class String8;
33class Rect;
34class Region;
35class Mesh;
36class Texture;
37
38class RenderEngine {
39    enum GlesVersion {
40        GLES_VERSION_1_0    = 0x10000,
41        GLES_VERSION_1_1    = 0x10001,
42        GLES_VERSION_2_0    = 0x20000,
43        GLES_VERSION_3_0    = 0x30000,
44    };
45    static GlesVersion parseGlesVersion(const char* str);
46
47    EGLContext mEGLContext;
48    void setEGLContext(EGLContext ctxt);
49
50    virtual void bindImageAsFramebuffer(EGLImageKHR image, uint32_t* texName, uint32_t* fbName, uint32_t* status) = 0;
51    virtual void unbindFramebuffer(uint32_t texName, uint32_t fbName) = 0;
52
53protected:
54    RenderEngine();
55    virtual ~RenderEngine() = 0;
56
57public:
58    static RenderEngine* create(EGLDisplay display, EGLConfig config);
59
60    // dump the extension strings. always call the base class.
61    virtual void dump(String8& result);
62
63    // helpers
64    void clearWithColor(float red, float green, float blue, float alpha);
65    void fillRegionWithColor(const Region& region, uint32_t height,
66            float red, float green, float blue, float alpha);
67
68    // common to all GL versions
69    void setScissor(uint32_t left, uint32_t bottom, uint32_t right, uint32_t top);
70    void disableScissor();
71    void genTextures(size_t count, uint32_t* names);
72    void deleteTextures(size_t count, uint32_t const* names);
73    void readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels);
74
75    class BindImageAsFramebuffer {
76        RenderEngine& mEngine;
77        uint32_t mTexName, mFbName;
78        uint32_t mStatus;
79    public:
80        BindImageAsFramebuffer(RenderEngine& engine, EGLImageKHR image);
81        ~BindImageAsFramebuffer();
82        int getStatus() const;
83    };
84
85    // set-up
86    virtual void checkErrors() const;
87    virtual void setViewportAndProjection(size_t vpw, size_t vph, size_t w, size_t h, bool yswap) = 0;
88    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha) = 0;
89    virtual void setupDimLayerBlending(int alpha) = 0;
90    virtual void setupLayerTexturing(const Texture& texture) = 0;
91    virtual void setupLayerBlackedOut() = 0;
92    virtual void setupFillWithColor(float r, float g, float b, float a) = 0;
93
94    virtual void disableTexturing() = 0;
95    virtual void disableBlending() = 0;
96
97    // drawing
98    virtual void drawMesh(const Mesh& mesh) = 0;
99
100    // grouping
101    // creates a color-transform group, everything drawn in the group will be
102    // transformed by the given color transform when endGroup() is called.
103    virtual void beginGroup(const mat4& colorTransform) = 0;
104    virtual void endGroup() = 0;
105
106    // queries
107    virtual size_t getMaxTextureSize() const = 0;
108    virtual size_t getMaxViewportDims() const = 0;
109
110    EGLContext getEGLContext() const;
111};
112
113// ---------------------------------------------------------------------------
114}; // namespace android
115// ---------------------------------------------------------------------------
116
117#endif /* SF_RENDERENGINE_H_ */
118