GLScaler.hh

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#ifndef GLSCALER_HH
#define GLSCALER_HH
 
#include "GLUtil.hh"
#include <string>
 
namespace openmsx {
 
class FrameSource;
 
class GLScaler
{
public:
        virtual ~GLScaler() = default;
 
        virtual void scaleImage(
                gl::ColorTexture& src, gl::ColorTexture* superImpose,
                unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
                unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
                unsigned logSrcHeight) = 0;
 
        virtual void uploadBlock(
                unsigned srcStartY, unsigned srcEndY,
                unsigned lineWidth, FrameSource& paintFrame);
 
protected:
        explicit GLScaler(const std::string& progName);
        void setup(bool superImpose);
 
        void execute(gl::ColorTexture& src, gl::ColorTexture* superImpose,
                     unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
                     unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
                     unsigned logSrcHeight,
                     bool textureFromZero = false);
 
protected:
        gl::BufferObject vbo[2];
        gl::ShaderProgram program[2];
        GLint unifTexSize[2];
};
 
} // namespace openmsx
 
#endif // GLSCALER_HH