TextureState.h revision 44eb2c00861098dd3e2950d923646814b4cc57c2 
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
26namespace android {
27namespace uirenderer {
28
29class TextureState {
30    friend class Caches; // TODO: move to RenderState
31public:
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);
74private:
75    // total number of texture units available for use
76    static const int kTextureUnitsCount = 3;
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