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      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 
     70 private:
     71     bool mUniformsDirty;
     72 };
     73 
     74 } /* namespace android */
     75 
     76 #endif /* SF_RENDER_ENGINE_DESCRIPTION_H_ */
     77