OpenGLRenderer.h revision 9d5316e3f56d138504565ff311145ac01621dff4 
1/*
2 * Copyright (C) 2010 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 ANDROID_UI_OPENGL_RENDERER_H
18#define ANDROID_UI_OPENGL_RENDERER_H
19
20#include <GLES2/gl2.h>
21#include <GLES2/gl2ext.h>
22
23#include <SkMatrix.h>
24#include <SkXfermode.h>
25
26#include <utils/KeyedVector.h>
27#include <utils/RefBase.h>
28
29#include "Matrix.h"
30#include "Rect.h"
31
32namespace android {
33namespace uirenderer {
34
35///////////////////////////////////////////////////////////////////////////////
36// Support
37///////////////////////////////////////////////////////////////////////////////
38
39class Snapshot: public LightRefBase<Snapshot> {
40public:
41	Snapshot() {
42	}
43
44	Snapshot(const sp<Snapshot> s):
45			transform(s->transform),
46			clipRect(s->clipRect),
47			flags(kFlagDirtyTransform),
48			previous(s) {
49	}
50
51	enum Flags {
52		kFlagClipSet = 0x1,
53		kFlagDirtyTransform = 0x2,
54	};
55
56	const Rect& getMappedClip();
57
58	// Local transformations
59	mat4 transform;
60
61	// Clipping rectangle at the time of this snapshot
62	Rect clipRect;
63
64	// Dirty flags
65	int flags;
66
67	// Previous snapshot in the frames stack
68	sp<Snapshot> previous;
69
70private:
71	// Clipping rectangle mapped with the transform
72	Rect mappedClip;
73}; // class Snapshot
74
75struct Vertex {
76	float position[2];
77	float color[4];
78}; // struct Vertex
79
80typedef char* shader;
81
82class Program: public LightRefBase<Program> {
83public:
84	Program(const char* vertex, const char* fragment);
85	~Program();
86
87	void use();
88
89protected:
90	int addAttrib(const char* name);
91	int getAttrib(const char* name);
92
93	int addUniform(const char* name);
94	int getUniform(const char* name);
95
96private:
97	GLuint buildShader(const char* source, GLenum type);
98
99	// Handle of the OpenGL program
100	GLuint id;
101
102	// Handles of the shaders
103	GLuint vertexShader;
104	GLuint fragmentShader;
105
106	// Keeps track of attributes and uniforms slots
107	KeyedVector<const char*, int> attributes;
108	KeyedVector<const char*, int> uniforms;
109}; // class Program
110
111class DrawColorProgram: public Program {
112public:
113	DrawColorProgram();
114
115	int position;
116	int color;
117
118	int projection;
119	int modelView;
120};
121
122///////////////////////////////////////////////////////////////////////////////
123// Renderer
124///////////////////////////////////////////////////////////////////////////////
125
126class OpenGLRenderer {
127public:
128    OpenGLRenderer();
129    ~OpenGLRenderer();
130
131    void setViewport(int width, int height);
132    void prepare();
133
134    int getSaveCount() const;
135    int save(int flags);
136    void restore();
137    void restoreToCount(int saveCount);
138
139    void translate(float dx, float dy);
140    void rotate(float degrees);
141    void scale(float sx, float sy);
142
143    void setMatrix(SkMatrix* matrix);
144    void getMatrix(SkMatrix* matrix);
145    void concatMatrix(SkMatrix* matrix);
146
147    const Rect& getClipBounds();
148    bool clipRect(float left, float top, float right, float bottom);
149
150    void drawColor(int color, SkXfermode::Mode mode);
151
152private:
153    int saveSnapshot();
154    bool restoreSnapshot();
155
156    void setScissorFromClip();
157
158    // Dimensions of the drawing surface
159    int mWidth, mHeight;
160
161    // Matrix used for ortho projection in shaders
162    float mOrthoMatrix[16];
163
164    // Number of saved states
165    int mSaveCount;
166    // Base state
167    Snapshot mFirstSnapshot;
168    // Current state
169    sp<Snapshot> mSnapshot;
170
171    // Shaders
172    sp<DrawColorProgram> mDrawColorShader;
173}; // class OpenGLRenderer
174
175}; // namespace uirenderer
176}; // namespace android
177
178#endif // ANDROID_UI_OPENGL_RENDERER_H
179