Home | History | Annotate | Download | only in RenderEngine 
      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 public:
     36     Description() = default;
     37     ~Description() = default;
     38 
     39     void setPremultipliedAlpha(bool premultipliedAlpha);
     40     void setOpaque(bool opaque);
     41     void setTexture(const Texture& texture);
     42     void disableTexture();
     43     void setColor(const half4& color);
     44     void setProjectionMatrix(const mat4& mtx);
     45     void setSaturationMatrix(const mat4& mtx);
     46     void setColorMatrix(const mat4& mtx);
     47     void setInputTransformMatrix(const mat3& matrix);
     48     void setOutputTransformMatrix(const mat4& matrix);
     49     bool hasInputTransformMatrix() const;
     50     bool hasOutputTransformMatrix() const;
     51     bool hasColorMatrix() const;
     52     bool hasSaturationMatrix() const;
     53     const mat4& getColorMatrix() const;
     54 
     55     void setY410BT2020(bool enable);
     56 
     57     enum class TransferFunction : int {
     58         LINEAR,
     59         SRGB,
     60         ST2084,
     61         HLG,  // Hybrid Log-Gamma for HDR.
     62     };
     63     void setInputTransferFunction(TransferFunction transferFunction);
     64     void setOutputTransferFunction(TransferFunction transferFunction);
     65     void setDisplayMaxLuminance(const float maxLuminance);
     66 
     67 private:
     68     friend class Program;
     69     friend class ProgramCache;
     70 
     71     // whether textures are premultiplied
     72     bool mPremultipliedAlpha = false;
     73     // whether this layer is marked as opaque
     74     bool mOpaque = true;
     75 
     76     // Texture this layer uses
     77     Texture mTexture;
     78     bool mTextureEnabled = false;
     79 
     80     // color used when texturing is disabled or when setting alpha.
     81     half4 mColor;
     82 
     83     // true if the sampled pixel values are in Y410/BT2020 rather than RGBA
     84     bool mY410BT2020 = false;
     85 
     86     // transfer functions for the input/output
     87     TransferFunction mInputTransferFunction = TransferFunction::LINEAR;
     88     TransferFunction mOutputTransferFunction = TransferFunction::LINEAR;
     89 
     90     float mDisplayMaxLuminance;
     91 
     92     // projection matrix
     93     mat4 mProjectionMatrix;
     94     mat4 mColorMatrix;
     95     mat4 mSaturationMatrix;
     96     mat3 mInputTransformMatrix;
     97     mat4 mOutputTransformMatrix;
     98 };
     99 
    100 } /* namespace android */
    101 
    102 #endif /* SF_RENDER_ENGINE_DESCRIPTION_H_ */
    103