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 _LIBRENDER_TEXTURERESIZE_H
17 #define _LIBRENDER_TEXTURERESIZE_H
18 
19 #include <GLES2/gl2.h>
20 #include <memory>
21 
22 namespace gfxstream {
23 namespace gl {
24 
25 class TextureResize {
26 public:
27     TextureResize(GLuint width, GLuint height);
28     ~TextureResize();
29 
30     // Scales the given texture for the current viewport and returns the scaled
31     // texture. May return the input if no scaling is required.
32     GLuint update(GLuint texture);
33     GLuint update(GLuint texture, int width, int height, int skinRotation);
34 
35     struct Framebuffer {
36         GLuint texture = 0;
37         GLuint framebuffer = 0;
38         GLuint program = 0;
39         GLuint aPosition = 0;
40         GLuint uTexture = 0;
41     };
42 
43     class GenericResizer {
44     public:
45         GenericResizer();
46         ~GenericResizer();
47 
48         // Renders the contents of 2D |input_texture| on screen
49         // |width| and |height| are the dimensions of the texture.
50         GLuint draw(GLuint texture, int width, int height, int skinRotation);
51 
52     private:
53         GLuint mProgram;
54         GLuint mVertexBuffer;
55         GLuint mIndexBuffer;
56         GLuint mInputUniformLocation;
57         GLuint mPositionAttribLocation;
58         GLuint mInCoordAttribLocation;
59         Framebuffer mFrameBuffer;
60         int mWidth;
61         int mHeight;
62     };
63 
64 private:
65     void setupFramebuffers(unsigned int factor);
66     void resize(GLuint texture);
67 
68 private:
69     GLuint mWidth;
70     GLuint mHeight;
71     unsigned int mFactor;
72     Framebuffer mFBWidth;
73     Framebuffer mFBHeight;
74     GLuint mVertexBuffer;
75     GLenum mTextureDataType;
76     GLenum mTextureFilteringMode = GL_LINEAR;
77     std::unique_ptr<GenericResizer> mGenericResizer;
78 };
79 
80 }  // namespace gl
81 }  // namespace gfxstream
82 
83 #endif
84