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      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_HWUI_TEXTURE_H
     18 #define ANDROID_HWUI_TEXTURE_H
     19 
     20 #include <GLES2/gl2.h>
     21 
     22 namespace android {
     23 namespace uirenderer {
     24 
     25 class Caches;
     26 class UvMapper;
     27 
     28 /**
     29  * Represents an OpenGL texture.
     30  */
     31 class Texture {
     32 public:
     33     Texture(Caches& caches) : mCaches(caches) { }
     34 
     35     virtual ~Texture() { }
     36 
     37     inline void setWrap(GLenum wrap, bool bindTexture = false, bool force = false,
     38                 GLenum renderTarget = GL_TEXTURE_2D) {
     39         setWrapST(wrap, wrap, bindTexture, force, renderTarget);
     40     }
     41 
     42     virtual void setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture = false,
     43             bool force = false, GLenum renderTarget = GL_TEXTURE_2D);
     44 
     45     inline void setFilter(GLenum filter, bool bindTexture = false, bool force = false,
     46                 GLenum renderTarget = GL_TEXTURE_2D) {
     47         setFilterMinMag(filter, filter, bindTexture, force, renderTarget);
     48     }
     49 
     50     virtual void setFilterMinMag(GLenum min, GLenum mag, bool bindTexture = false,
     51             bool force = false, GLenum renderTarget = GL_TEXTURE_2D);
     52 
     53     /**
     54      * Convenience method to call glDeleteTextures() on this texture's id.
     55      */
     56     void deleteTexture() const;
     57 
     58     /**
     59      * Name of the texture.
     60      */
     61     GLuint id = 0;
     62     /**
     63      * Generation of the backing bitmap,
     64      */
     65     uint32_t generation = 0;
     66     /**
     67      * Indicates whether the texture requires blending.
     68      */
     69     bool blend = false;
     70     /**
     71      * Width of the backing bitmap.
     72      */
     73     uint32_t width = 0;
     74     /**
     75      * Height of the backing bitmap.
     76      */
     77     uint32_t height = 0;
     78     /**
     79      * Indicates whether this texture should be cleaned up after use.
     80      */
     81     bool cleanup = false;
     82     /**
     83      * Optional, size of the original bitmap.
     84      */
     85     uint32_t bitmapSize = 0;
     86     /**
     87      * Indicates whether this texture will use trilinear filtering.
     88      */
     89     bool mipMap = false;
     90 
     91     /**
     92      * Optional, pointer to a texture coordinates mapper.
     93      */
     94     const UvMapper* uvMapper = nullptr;
     95 
     96     /**
     97      * Whether or not the Texture is marked in use and thus not evictable for
     98      * the current frame. This is reset at the start of a new frame.
     99      */
    100     void* isInUse = nullptr;
    101 
    102 private:
    103     /**
    104      * Last wrap modes set on this texture.
    105      */
    106     GLenum mWrapS = GL_CLAMP_TO_EDGE;
    107     GLenum mWrapT = GL_CLAMP_TO_EDGE;
    108 
    109     /**
    110      * Last filters set on this texture.
    111      */
    112     GLenum mMinFilter = GL_NEAREST;
    113     GLenum mMagFilter = GL_NEAREST;
    114 
    115     bool mFirstFilter = true;
    116     bool mFirstWrap = true;
    117 
    118     Caches& mCaches;
    119 }; // struct Texture
    120 
    121 class AutoTexture {
    122 public:
    123     AutoTexture(const Texture* texture): mTexture(texture) { }
    124     ~AutoTexture() {
    125         if (mTexture && mTexture->cleanup) {
    126             mTexture->deleteTexture();
    127             delete mTexture;
    128         }
    129     }
    130 
    131 private:
    132     const Texture* mTexture;
    133 }; // class AutoTexture
    134 
    135 }; // namespace uirenderer
    136 }; // namespace android
    137 
    138 #endif // ANDROID_HWUI_TEXTURE_H
    139