1 /*
2  * Copyright (C) 2011 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_FILTERFW_CORE_GL_BUFFER_INTERFACE_H
18 #define ANDROID_FILTERFW_CORE_GL_BUFFER_INTERFACE_H
19 
20 #include <GLES2/gl2.h>
21 
22 namespace android {
23 namespace filterfw {
24 
25 class GLTextureHandle {
26   public:
~GLTextureHandle()27     virtual ~GLTextureHandle() { }
28 
29     // Returns the held texture id.
30     virtual GLuint GetTextureId() const = 0;
31 
32     // Binds the held texture. This may result in creating the texture if it
33     // is not yet available.
34     virtual bool FocusTexture() = 0;
35 
36     // Generates the mipmap chain of the held texture. Returns true, iff
37     // generating was successful.
38     virtual bool GenerateMipMap() = 0;
39 
40     // Set a texture parameter (see glTextureParameter documentation). Returns
41     // true iff the parameter was set successfully.
42     virtual bool SetTextureParameter(GLenum pname, GLint value) = 0;
43 
44     // Returns the texture target used.
45     // Texture Target should be: GL_TEXTURE_2D, GL_TEXTURE_EXTERNAL_OES.
46     virtual GLuint GetTextureTarget() const = 0;
47 };
48 
49 class GLFrameBufferHandle {
50   public:
~GLFrameBufferHandle()51     virtual ~GLFrameBufferHandle() { }
52 
53     // Returns the held FBO id.
54     virtual GLuint GetFboId() const = 0;
55 
56     // Binds the held FBO. This may result in creating the FBO if it
57     // is not yet available.
58     virtual bool FocusFrameBuffer() = 0;
59 };
60 
61 // Interface to instances that hold GL textures and frame-buffer-objects.
62 // The GLFrame class implements this interface.
63 class GLBufferHandle : public GLTextureHandle, public GLFrameBufferHandle {
64   public:
~GLBufferHandle()65     virtual ~GLBufferHandle() { }
66 };
67 
68 } // namespace filterfw
69 } // namespace android
70 
71 #endif  // ANDROID_FILTERFW_CORE_GL_BUFFER_INTERFACE_H
72