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      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