OpenGLRenderer.h revision d55a86120dd1e8ebcc6906c9ffd463f7460348da
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/RefBase.h> 27 28#include "Matrix.h" 29#include "Program.h" 30#include "Rect.h" 31#include "Snapshot.h" 32 33namespace android { 34namespace uirenderer { 35 36/////////////////////////////////////////////////////////////////////////////// 37// Support 38/////////////////////////////////////////////////////////////////////////////// 39 40/** 41 * Simple structure to describe a vertex with a position. 42 * This is used to draw filled rectangles without a texture. 43 */ 44struct SimpleVertex { 45 float position[2]; 46}; // struct SimpleVertex 47 48/** 49 * Simple structure to describe a vertex with a position and a texture. 50 */ 51struct TextureVertex { 52 float position[2]; 53 float texture[2]; 54}; // struct TextureVertex 55 56/** 57 * Structure mapping Skia xfermodes to OpenGL blending factors. 58 */ 59struct Blender { 60 SkXfermode::Mode mode; 61 GLenum src; 62 GLenum dst; 63}; // struct Blender 64 65/////////////////////////////////////////////////////////////////////////////// 66// Renderer 67/////////////////////////////////////////////////////////////////////////////// 68 69/** 70 * OpenGL renderer used to draw accelerated 2D graphics. The API is a 71 * simplified version of Skia's Canvas API. 72 */ 73class OpenGLRenderer { 74public: 75 OpenGLRenderer(); 76 ~OpenGLRenderer(); 77 78 void setViewport(int width, int height); 79 void prepare(); 80 81 int getSaveCount() const; 82 int save(int flags); 83 void restore(); 84 void restoreToCount(int saveCount); 85 86 int saveLayer(float left, float top, float right, float bottom, const SkPaint* p, int flags); 87 int saveLayerAlpha(float left, float top, float right, float bottom, int alpha, int flags); 88 89 void translate(float dx, float dy); 90 void rotate(float degrees); 91 void scale(float sx, float sy); 92 93 void setMatrix(SkMatrix* matrix); 94 void getMatrix(SkMatrix* matrix); 95 void concatMatrix(SkMatrix* matrix); 96 97 const Rect& getClipBounds(); 98 bool quickReject(float left, float top, float right, float bottom); 99 bool clipRect(float left, float top, float right, float bottom); 100 101 void drawColor(int color, SkXfermode::Mode mode); 102 void drawRect(float left, float top, float right, float bottom, const SkPaint* paint); 103 104private: 105 /** 106 * Saves the current state of the renderer as a new snapshot. 107 * The new snapshot is saved in mSnapshot and the previous snapshot 108 * is linked from mSnapshot->previous. 109 * 110 * @return The new save count. This value can be passed to #restoreToCount() 111 */ 112 int saveSnapshot(); 113 114 /** 115 * Restores the current snapshot; mSnapshot becomes mSnapshot->previous. 116 * 117 * @return True if the clip should be also reapplied by calling 118 * #setScissorFromClip(). 119 */ 120 bool restoreSnapshot(); 121 122 /** 123 * Sets the clipping rectangle using glScissor. The clip is defined by 124 * the current snapshot's clipRect member. 125 */ 126 void setScissorFromClip(); 127 128 /** 129 * Compose the layer defined in the current snapshot with the layer 130 * defined by the previous snapshot. 131 * 132 * The current snapshot *must* be a layer (flag kFlagIsLayer set.) 133 * 134 * @param curent The current snapshot containing the layer to compose 135 * @param previous The previous snapshot to compose the current layer with 136 */ 137 void composeLayer(sp<Snapshot> current, sp<Snapshot> previous); 138 139 /** 140 * Creates a new layer stored in the specified snapshot. 141 * 142 * @param snapshot The snapshot associated with the new layer 143 * @param left The left coordinate of the layer 144 * @param top The top coordinate of the layer 145 * @param right The right coordinate of the layer 146 * @param bottom The bottom coordinate of the layer 147 * @param alpha The translucency of the layer 148 * @param mode The blending mode of the layer 149 * @param flags The layer save flags 150 * 151 * @return True if the layer was successfully created, false otherwise 152 */ 153 bool createLayer(sp<Snapshot> snapshot, float left, float top, float right, float bottom, 154 int alpha, SkXfermode::Mode mode, int flags); 155 156 /** 157 * Draws a colored rectangle with the specified color. The specified coordinates 158 * are transformed by the current snapshot's transform matrix. 159 * 160 * @param left The left coordinate of the rectangle 161 * @param top The top coordinate of the rectangle 162 * @param right The right coordinate of the rectangle 163 * @param bottom The bottom coordinate of the rectangle 164 * @param color The rectangle's ARGB color, defined as a packed 32 bits word 165 * @param mode The Skia xfermode to use 166 */ 167 void drawColorRect(float left, float top, float right, float bottom, 168 int color, SkXfermode::Mode mode); 169 170 /** 171 * Draws a textured rectangle with the specified texture. The specified coordinates 172 * are transformed by the current snapshot's transform matrix. 173 * 174 * @param left The left coordinate of the rectangle 175 * @param top The top coordinate of the rectangle 176 * @param right The right coordinate of the rectangle 177 * @param bottom The bottom coordinate of the rectangle 178 * @param texture The texture name to map onto the rectangle 179 * @param alpha An additional translucency parameter, between 0.0f and 1.0f 180 * @param mode The blending mode 181 * @param isPremultiplied Indicates whether the texture has premultiplied alpha 182 */ 183 void drawTextureRect(float left, float top, float right, float bottom, GLuint texture, 184 float alpha, SkXfermode::Mode mode, bool isPremultiplied = false); 185 186 /** 187 * Resets the texture coordinates stored in mDrawTextureVertices. Setting the values 188 * back to default is achieved by calling: 189 * 190 * resetDrawTextureTexCoords(0.0f, 1.0f, 1.0f, 0.0f); 191 * 192 * @param u1 The left coordinate of the texture 193 * @param v1 The bottom coordinate of the texture 194 * @param u2 The right coordinate of the texture 195 * @param v2 The top coordinate of the texture 196 */ 197 void resetDrawTextureTexCoords(float u1, float v1, float u2, float v2); 198 199 // Dimensions of the drawing surface 200 int mWidth, mHeight; 201 202 // Matrix used for ortho projection in shaders 203 float mOrthoMatrix[16]; 204 205 // Model-view matrix used to position/size objects 206 mat4 mModelView; 207 208 // Number of saved states 209 int mSaveCount; 210 // Base state 211 Snapshot mFirstSnapshot; 212 // Current state 213 sp<Snapshot> mSnapshot; 214 215 // Shaders 216 sp<DrawColorProgram> mDrawColorShader; 217 sp<DrawTextureProgram> mDrawTextureShader; 218 219 // Used to draw textured quads 220 TextureVertex mDrawTextureVertices[4]; 221}; // class OpenGLRenderer 222 223}; // namespace uirenderer 224}; // namespace android 225 226#endif // ANDROID_UI_OPENGL_RENDERER_H 227