#pragma optimize (on)
#pragma debug (off)

uniform sampler2D     mpass_texture;
uniform sampler2D     color_texture;
uniform vec2          color_texture_pow2_sz; // pow2 tex size
uniform vec4          vid_attributes;        // gamma, contrast, brightness

#define TEX2D(c) texture2D(mpass_texture,(c))
#define PI 3.141592653589

void main()
{
	vec2 xy = gl_TexCoord[0].st;

	vec2 uv_ratio     = fract(xy*color_texture_pow2_sz);
	vec2 one          = 1.0/color_texture_pow2_sz;

	vec4 col, col2;

	vec4 coeffs = vec4(1.0 + uv_ratio.x, uv_ratio.x, 1.0 - uv_ratio.x, 2.0 - uv_ratio.x);
	coeffs = sin(PI * coeffs) * sin(PI * coeffs / 2.0) / (coeffs * coeffs);
	coeffs = coeffs / (coeffs.x+coeffs.y+coeffs.z+coeffs.w);

	col  = clamp(coeffs.x * TEX2D(xy + vec2(-one.x,0.0)) + coeffs.y * TEX2D(xy) + coeffs.z * TEX2D(xy + vec2(one.x, 0.0)) + coeffs.w * TEX2D(xy + vec2(2 * one.x, 0.0)),0.0,1.0);
	col2 = clamp(coeffs.x * TEX2D(xy + vec2(-one.x,one.y)) + coeffs.y * TEX2D(xy + vec2(0.0, one.y)) + coeffs.z * TEX2D(xy + one) + coeffs.w * TEX2D(xy + vec2(2 * one.x, one.y)),0.0,1.0);
	col = pow(col, 2.2);
	col2 = pow(col2, 2.2);
	

	vec4 wid = 0.3 + 0.2 * pow(col, 4.0);
	vec4 weights = uv_ratio.y/wid;
	weights = 0.51*exp(-weights*weights)/wid;
	wid = 0.3 + 0.2 * pow(col2,4.0);
	vec4 weights2 = (1.0-uv_ratio.y)/wid;
	weights2 = 0.51*exp(-weights2*weights2)/wid;

	gl_FragColor = pow(col * weights + col2 * weights2, 1.0/2.2);
}

sdlmame -gl_glsl -glsl_shader_mame0 shader/glsl_plain -glsl_shader_mame1 shader/custom/scanlines -effect aperture4x4v2 sf2