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 "Texture.h" 20 #include "Vertex.h" 21 22 #include <GLES2/gl2.h> 23 #include <GLES2/gl2ext.h> 24 #include <memory> 25 26 namespace android { 27 namespace uirenderer { 28 29 class Texture; 30 31 class TextureState { 32 friend class Caches; // TODO: move to RenderState 33 public: 34 void constructTexture(Caches& caches); 35 36 /** 37 * Activate the specified texture unit. The texture unit must 38 * be specified using an integer number (0 for GL_TEXTURE0 etc.) 39 */ 40 void activateTexture(GLuint textureUnit); 41 42 /** 43 * Invalidate the cached value of the active texture unit. 44 */ 45 void resetActiveTexture(); 46 47 /** 48 * Binds the specified texture as a GL_TEXTURE_2D texture. 49 * All texture bindings must be performed with this method or 50 * bindTexture(GLenum, GLuint). 51 */ 52 void bindTexture(GLuint texture); 53 54 /** 55 * Binds the specified texture with the specified render target. 56 * All texture bindings must be performed with this method or 57 * bindTexture(GLuint). 58 */ 59 void bindTexture(GLenum target, GLuint texture); 60 61 /** 62 * Deletes the specified texture and clears it from the cache 63 * of bound textures. 64 * All textures must be deleted using this method. 65 */ 66 void deleteTexture(GLuint texture); 67 68 /** 69 * Signals that the cache of bound textures should be cleared. 70 * Other users of the context may have altered which textures are bound. 71 */ 72 void resetBoundTextures(); 73 74 /** 75 * Clear the cache of bound textures. 76 */ 77 void unbindTexture(GLuint texture); 78 getShadowLutTexture()79 Texture* getShadowLutTexture() { return mShadowLutTexture.get(); } 80 81 private: 82 // total number of texture units available for use 83 static const int kTextureUnitsCount = 4; 84 85 TextureState(); 86 ~TextureState(); 87 GLuint mTextureUnit; 88 89 // Caches texture bindings for the GL_TEXTURE_2D target 90 GLuint mBoundTextures[kTextureUnitsCount]; 91 92 std::unique_ptr<Texture> mShadowLutTexture; 93 }; 94 95 } /* namespace uirenderer */ 96 } /* namespace android */ 97 98 #endif // RENDERSTATE_BLEND_H 99