mirror of https://github.com/bsnes-emu/bsnes.git
89 lines
2.7 KiB
GLSL
89 lines
2.7 KiB
GLSL
#version 150
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#in red
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#in green
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#in blue
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#in gain
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#in gamma
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#in blacklevel
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#in ambient
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#in BGR
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#define outgamma 2.2
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uniform sampler2D source[];
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uniform vec4 sourceSize[];
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uniform vec4 targetSize;
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in Vertex {
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vec2 texCoord;
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};
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out vec4 fragColor;
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#define fetch_offset(coord,offset) (pow(vec3(gain) * texelFetchOffset(source[0], (coord), 0, (offset)).rgb + vec3(blacklevel), vec3(gamma)) + vec3(ambient))
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// integral of (1 - x^2 - x^4 + x^6)^2
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const float coeffs_x[] = float[](1.0, -2.0/3.0, -1.0/5.0, 4.0/7.0, -1.0/9.0, -2.0/11.0, 1.0/13.0);
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// integral of (1 - 2x^4 + x^6)^2
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const float coeffs_y[] = float[](1.0, 0.0, -4.0/5.0, 2.0/7.0, 4.0/9.0, -4.0/11.0, 1.0/13.0);
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float intsmear_func(float z, float coeffs[7])
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{
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float z2 = z*z;
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float zn = z;
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float ret = 0.0;
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for (int i = 0; i < 7; i++) {
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ret += zn*coeffs[i];
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zn *= z2;
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}
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return ret;
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}
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float intsmear(float x, float dx, float d, float coeffs[7])
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{
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float zl = clamp((x-dx*0.5)/d,-1.0,1.0);
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float zh = clamp((x+dx*0.5)/d,-1.0,1.0);
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return d * ( intsmear_func(zh,coeffs) - intsmear_func(zl,coeffs) )/dx;
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}
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void main()
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{
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vec2 texelSize = 1.0 / sourceSize[0].xy;
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vec2 range = sourceSize[0].xy / (targetSize.xy * sourceSize[0].xy);
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vec3 cred = pow(red, vec3(outgamma));
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vec3 cgreen = pow(green, vec3(outgamma));
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vec3 cblue = pow(blue, vec3(outgamma));
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ivec2 tli = ivec2(floor(texCoord/texelSize-vec2(0.4999)));
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vec3 lcol, rcol;
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float subpix = (texCoord.x/texelSize.x - 0.4999 - float(tli.x))*3.0;
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float rsubpix = range.x/texelSize.x * 3.0;
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lcol = vec3(intsmear(subpix+1.0,rsubpix, 1.5, coeffs_x),
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intsmear(subpix ,rsubpix, 1.5, coeffs_x),
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intsmear(subpix-1.0,rsubpix, 1.5, coeffs_x));
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rcol = vec3(intsmear(subpix-2.0,rsubpix, 1.5, coeffs_x),
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intsmear(subpix-3.0,rsubpix, 1.5, coeffs_x),
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intsmear(subpix-4.0,rsubpix, 1.5, coeffs_x));
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#ifdef BGR
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lcol.rgb = lcol.bgr;
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rcol.rgb = rcol.bgr;
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#endif
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float tcol, bcol;
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subpix = texCoord.y/texelSize.y - 0.4999 - float(tli.y);
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rsubpix = range.y/texelSize.y;
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tcol = intsmear(subpix ,rsubpix, 0.63, coeffs_y);
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bcol = intsmear(subpix-1.0,rsubpix, 0.63, coeffs_y);
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vec3 topLeftColor = fetch_offset(tli, ivec2(0,0)) * lcol * vec3(tcol);
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vec3 bottomRightColor = fetch_offset(tli, ivec2(1,1)) * rcol * vec3(bcol);
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vec3 bottomLeftColor = fetch_offset(tli, ivec2(0,1)) * lcol * vec3(bcol);
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vec3 topRightColor = fetch_offset(tli, ivec2(1,0)) * rcol * vec3(tcol);
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vec3 averageColor = topLeftColor + bottomRightColor + bottomLeftColor + topRightColor;
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averageColor = mat3x3(cred, cgreen, cblue) * averageColor;
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fragColor = vec4(pow(averageColor,vec3(1.0/outgamma)),0.0);
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}
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