1 /* 2 * Copyright (C) 2015 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 #ifndef RENDERSTATE_TEXTURESTATE_H 17 #define RENDERSTATE_TEXTURESTATE_H 18 19 #include "Vertex.h" 20 21 #include <GLES2/gl2.h> 22 #include <GLES2/gl2ext.h> 23 #include <SkXfermode.h> 24 #include <memory> 25 26 namespace android { 27 namespace uirenderer { 28 29 class TextureState { 30 friend class Caches; // TODO: move to RenderState 31 public: 32 /** 33 * Activate the specified texture unit. The texture unit must 34 * be specified using an integer number (0 for GL_TEXTURE0 etc.) 35 */ 36 void activateTexture(GLuint textureUnit); 37 38 /** 39 * Invalidate the cached value of the active texture unit. 40 */ 41 void resetActiveTexture(); 42 43 /** 44 * Binds the specified texture as a GL_TEXTURE_2D texture. 45 * All texture bindings must be performed with this method or 46 * bindTexture(GLenum, GLuint). 47 */ 48 void bindTexture(GLuint texture); 49 50 /** 51 * Binds the specified texture with the specified render target. 52 * All texture bindings must be performed with this method or 53 * bindTexture(GLuint). 54 */ 55 void bindTexture(GLenum target, GLuint texture); 56 57 /** 58 * Deletes the specified texture and clears it from the cache 59 * of bound textures. 60 * All textures must be deleted using this method. 61 */ 62 void deleteTexture(GLuint texture); 63 64 /** 65 * Signals that the cache of bound textures should be cleared. 66 * Other users of the context may have altered which textures are bound. 67 */ 68 void resetBoundTextures(); 69 70 /** 71 * Clear the cache of bound textures. 72 */ 73 void unbindTexture(GLuint texture); 74 private: 75 // total number of texture units available for use 76 static const int kTextureUnitsCount = 4; 77 78 TextureState(); 79 GLuint mTextureUnit; 80 81 // Caches texture bindings for the GL_TEXTURE_2D target 82 GLuint mBoundTextures[kTextureUnitsCount]; 83 }; 84 85 } /* namespace uirenderer */ 86 } /* namespace android */ 87 88 #endif // RENDERSTATE_BLEND_H 89