#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