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
23namespace android {
24
25class 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 */
34class 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
57public:
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
71private:
72    bool mUniformsDirty;
73};
74
75} /* namespace android */
76
77#endif /* SF_RENDER_ENGINE_DESCRIPTION_H_ */
78