GLTVScaler.cc

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#include "GLTVScaler.hh"
#include "RenderSettings.hh"
 
namespace openmsx {
 
GLTVScaler::GLTVScaler(RenderSettings& renderSettings_)
        : GLScaler("tv")
        , renderSettings(renderSettings_)
{
        for (auto i : xrange(2)) {
                program[i].activate();
                unifMinScanline[i] =
                        program[i].getUniformLocation("minScanline");
                unifSizeVariance[i] =
                        program[i].getUniformLocation("sizeVariance");
        }
}
 
void GLTVScaler::scaleImage(
        gl::ColorTexture& src, gl::ColorTexture* superImpose,
        unsigned srcStartY, unsigned srcEndY, unsigned srcWidth,
        unsigned dstStartY, unsigned dstEndY, unsigned dstWidth,
        unsigned logSrcHeight)
{
        setup(superImpose != nullptr);
        int i = superImpose ? 1 : 0;
        // These are experimentally established functions that look good.
        // By design, both are 0 for scanline 0.
        float gap = renderSettings.getScanlineGap();
        glUniform1f(unifMinScanline [i], 0.1f * gap + 0.2f * gap * gap);
        glUniform1f(unifSizeVariance[i], 0.7f * gap - 0.3f * gap * gap);
        execute(src, superImpose,
                srcStartY, srcEndY, srcWidth,
                dstStartY, dstEndY, dstWidth,
                logSrcHeight, true);
}
 
} // namespace openmsx