1 /*
2  * Copyright 2013 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 #include <GLES2/gl2.h>
18 #include "Texture.h"
19 
20 #ifndef SF_RENDER_ENGINE_DESCRIPTION_H_
21 #define SF_RENDER_ENGINE_DESCRIPTION_H_
22 
23 namespace android {
24 
25 class Program;
26 
27 /*
28  * This holds the state of the rendering engine. This class is used
29  * to generate a corresponding GLSL program and set the appropriate
30  * uniform.
31  *
32  * Program and ProgramCache are friends and access the state directly
33  */
34 class Description {
35     friend class Program;
36     friend class ProgramCache;
37 
38     // value of the plane-alpha, between 0 and 1
39     GLclampf mPlaneAlpha;
40     // whether textures are premultiplied
41     bool mPremultipliedAlpha;
42     // whether this layer is marked as opaque
43     bool mOpaque;
44 
45     // Texture this layer uses
46     Texture mTexture;
47     bool mTextureEnabled;
48 
49     // color used when texturing is disabled
50     GLclampf mColor[4];
51     // projection matrix
52     mat4 mProjectionMatrix;
53 
54     bool mColorMatrixEnabled;
55     mat4 mColorMatrix;
56 
57 public:
58     Description();
59     ~Description();
60 
61     void setPlaneAlpha(GLclampf planeAlpha);
62     void setPremultipliedAlpha(bool premultipliedAlpha);
63     void setOpaque(bool opaque);
64     void setTexture(const Texture& texture);
65     void disableTexture();
66     void setColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
67     void setProjectionMatrix(const mat4& mtx);
68     void setColorMatrix(const mat4& mtx);
69     const mat4& getColorMatrix() const;
70 
71 private:
72     bool mUniformsDirty;
73 };
74 
75 } /* namespace android */
76 
77 #endif /* SF_RENDER_ENGINE_DESCRIPTION_H_ */
78