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#version 330
// This is a fuck shader. It is very fuck.
in vec2 fragTexCoord;
out vec4 fragColor;
uniform sampler2D texture0;
uniform vec4 colDiffuse;
const float PI = 3.1415926535;
const float aperture = 290.0;
const float renderWidth = 16;
const float renderHeight = 12;
const float gamma = 0.6;
const float numColors = 3.0;
float offset[3] = float[](0.0, 1.3846153846, 3.2307692308);
float weight[3] = float[](0.2270270270, 0.3162162162, 0.0702702703);
void main()
{
float apertureHalf = 0.5*aperture*(PI/180.0);
float maxFactor = sin(apertureHalf);
vec2 uv = vec2(0);
vec2 xy = 2.0*fragTexCoord.xy - 1.0;
float d = length(xy);
if (d < (2.0 - maxFactor))
{
d = length(xy*maxFactor);
float z = sqrt(1.0 - d*d);
float r = atan(d, z)/PI;
float phi = atan(xy.y, xy.x);
uv.x = r*cos(phi) + 0.5;
uv.y = r*sin(phi) + 0.5;
}
else
{
uv = fragTexCoord.xy;
}
vec4 color = texture(texture0, uv);
color += texture(texture0, fragTexCoord + 0.001);
color += texture(texture0, fragTexCoord + 0.003);
color += texture(texture0, fragTexCoord + 0.005);
color += texture(texture0, fragTexCoord + 0.007);
color += texture(texture0, fragTexCoord + 0.009);
color += texture(texture0, fragTexCoord + 0.011);
color += texture(texture0, fragTexCoord - 0.001);
color += texture(texture0, fragTexCoord - 0.003);
color += texture(texture0, fragTexCoord - 0.005);
color += texture(texture0, fragTexCoord - 0.007);
color += texture(texture0, fragTexCoord - 0.009);
color += texture(texture0, fragTexCoord - 0.011);
color.rgb = vec3((color.r + color.g + color.b)/3.0);
color = color/9.5;
float x = 1.0/renderWidth;
float y = 1.0/renderHeight;
vec4 horizEdge = vec4(0.0);
horizEdge -= texture(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y - y))*1.0;
horizEdge -= texture(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y ))*2.0;
horizEdge -= texture(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y + y))*1.0;
horizEdge += texture(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y - y))*1.0;
horizEdge += texture(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y ))*2.0;
horizEdge += texture(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y + y))*1.0;
vec4 vertEdge = vec4(0.0);
vertEdge -= texture(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y - y))*1.0;
vertEdge -= texture(texture0, vec2(fragTexCoord.x , fragTexCoord.y - y))*2.0;
vertEdge -= texture(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y - y))*1.0;
vertEdge += texture(texture0, vec2(fragTexCoord.x - x, fragTexCoord.y + y))*1.0;
vertEdge += texture(texture0, vec2(fragTexCoord.x , fragTexCoord.y + y))*2.0;
vertEdge += texture(texture0, vec2(fragTexCoord.x + x, fragTexCoord.y + y))*1.0;
vec3 edge = sqrt((horizEdge.rgb*horizEdge.rgb) + (vertEdge.rgb*vertEdge.rgb));
vec3 texelColor = ((color + texture(texture0, uv)) * weight[0]).rgb + edge;
for (int i = 1; i < 3; i++)
{
texelColor += texture(texture0, fragTexCoord + vec2(offset[i])/renderWidth, 0.0).rgb*weight[i];
texelColor += texture(texture0, fragTexCoord - vec2(offset[i])/renderWidth, 0.0).rgb*weight[i];
}
texelColor = pow(texelColor, vec3(gamma, gamma, gamma));
texelColor = texelColor*numColors;
texelColor = floor(texelColor);
texelColor = texelColor/numColors;
texelColor = pow(texelColor, vec3(1.0/gamma));
fragColor = vec4(texelColor, 1.0);
}
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