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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 #include "Texture.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 
     35     void constructTexture(Caches& caches);
     36 
     37     /**
     38      * Activate the specified texture unit. The texture unit must
     39      * be specified using an integer number (0 for GL_TEXTURE0 etc.)
     40      */
     41     void activateTexture(GLuint textureUnit);
     42 
     43     /**
     44      * Invalidate the cached value of the active texture unit.
     45      */
     46     void resetActiveTexture();
     47 
     48     /**
     49      * Binds the specified texture as a GL_TEXTURE_2D texture.
     50      * All texture bindings must be performed with this method or
     51      * bindTexture(GLenum, GLuint).
     52      */
     53     void bindTexture(GLuint texture);
     54 
     55     /**
     56      * Binds the specified texture with the specified render target.
     57      * All texture bindings must be performed with this method or
     58      * bindTexture(GLuint).
     59      */
     60     void bindTexture(GLenum target, GLuint texture);
     61 
     62     /**
     63      * Deletes the specified texture and clears it from the cache
     64      * of bound textures.
     65      * All textures must be deleted using this method.
     66      */
     67     void deleteTexture(GLuint texture);
     68 
     69     /**
     70      * Signals that the cache of bound textures should be cleared.
     71      * Other users of the context may have altered which textures are bound.
     72      */
     73     void resetBoundTextures();
     74 
     75     /**
     76      * Clear the cache of bound textures.
     77      */
     78     void unbindTexture(GLuint texture);
     79 
     80     Texture* getShadowLutTexture() { return mShadowLutTexture.get(); }
     81 
     82 private:
     83     // total number of texture units available for use
     84     static const int kTextureUnitsCount = 4;
     85 
     86     TextureState();
     87     ~TextureState();
     88     GLuint mTextureUnit;
     89 
     90     // Caches texture bindings for the GL_TEXTURE_2D target
     91     GLuint mBoundTextures[kTextureUnitsCount];
     92 
     93     std::unique_ptr<Texture> mShadowLutTexture;
     94 };
     95 
     96 } /* namespace uirenderer */
     97 } /* namespace android */
     98 
     99 #endif // RENDERSTATE_BLEND_H
    100