RenderEngine.h revision c3ebe66b49cfba035e1fd0e160a13db38eb81b0e 
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#include <Transform.h>
28
29#define EGL_NO_CONFIG ((EGLConfig)0)
30
31// ---------------------------------------------------------------------------
32namespace android {
33// ---------------------------------------------------------------------------
34
35class String8;
36class Rect;
37class Region;
38class Mesh;
39class Texture;
40
41class RenderEngine {
42    enum GlesVersion {
43        GLES_VERSION_1_0    = 0x10000,
44        GLES_VERSION_1_1    = 0x10001,
45        GLES_VERSION_2_0    = 0x20000,
46        GLES_VERSION_3_0    = 0x30000,
47    };
48    static GlesVersion parseGlesVersion(const char* str);
49
50    EGLConfig mEGLConfig;
51    EGLContext mEGLContext;
52    void setEGLHandles(EGLConfig config, EGLContext ctxt);
53
54    virtual void bindImageAsFramebuffer(EGLImageKHR image, uint32_t* texName, uint32_t* fbName, uint32_t* status) = 0;
55    virtual void unbindFramebuffer(uint32_t texName, uint32_t fbName) = 0;
56
57protected:
58    RenderEngine();
59    virtual ~RenderEngine() = 0;
60
61public:
62    static RenderEngine* create(EGLDisplay display, int hwcFormat);
63
64    static EGLConfig chooseEglConfig(EGLDisplay display, int format);
65
66    // dump the extension strings. always call the base class.
67    virtual void dump(String8& result);
68
69    // helpers
70    void clearWithColor(float red, float green, float blue, float alpha);
71    void fillRegionWithColor(const Region& region, uint32_t height,
72            float red, float green, float blue, float alpha);
73
74    // common to all GL versions
75    void setScissor(uint32_t left, uint32_t bottom, uint32_t right, uint32_t top);
76    void disableScissor();
77    void genTextures(size_t count, uint32_t* names);
78    void deleteTextures(size_t count, uint32_t const* names);
79    void readPixels(size_t l, size_t b, size_t w, size_t h, uint32_t* pixels);
80
81    class BindImageAsFramebuffer {
82        RenderEngine& mEngine;
83        uint32_t mTexName, mFbName;
84        uint32_t mStatus;
85    public:
86        BindImageAsFramebuffer(RenderEngine& engine, EGLImageKHR image);
87        ~BindImageAsFramebuffer();
88        int getStatus() const;
89    };
90
91    // set-up
92    virtual void checkErrors() const;
93    virtual void setViewportAndProjection(size_t vpw, size_t vph,
94            Rect sourceCrop, size_t hwh, bool yswap, Transform::orientation_flags rotation) = 0;
95    virtual void setupLayerBlending(bool premultipliedAlpha, bool opaque, int alpha) = 0;
96    virtual void setupDimLayerBlending(int alpha) = 0;
97    virtual void setupLayerTexturing(const Texture& texture) = 0;
98    virtual void setupLayerBlackedOut() = 0;
99    virtual void setupFillWithColor(float r, float g, float b, float a) = 0;
100
101    virtual void disableTexturing() = 0;
102    virtual void disableBlending() = 0;
103
104    // drawing
105    virtual void drawMesh(const Mesh& mesh) = 0;
106
107    // grouping
108    // creates a color-transform group, everything drawn in the group will be
109    // transformed by the given color transform when endGroup() is called.
110    virtual void beginGroup(const mat4& colorTransform) = 0;
111    virtual void endGroup() = 0;
112
113    // queries
114    virtual size_t getMaxTextureSize() const = 0;
115    virtual size_t getMaxViewportDims() const = 0;
116
117    EGLConfig getEGLConfig() const;
118    EGLContext getEGLContext() const;
119};
120
121// ---------------------------------------------------------------------------
122}; // namespace android
123// ---------------------------------------------------------------------------
124
125#endif /* SF_RENDERENGINE_H_ */
126