mirror of
https://github.com/italicsjenga/slang-shaders.git
synced 2024-11-25 17:01:31 +11:00
114 lines
3.4 KiB
Plaintext
114 lines
3.4 KiB
Plaintext
#version 450
|
|
|
|
layout(std140, set = 0, binding = 0) uniform UBO
|
|
{
|
|
mat4 MVP;
|
|
vec4 OutputSize;
|
|
vec4 OriginalSize;
|
|
vec4 SourceSize;
|
|
} global;
|
|
|
|
#define RSUBPIX_R 1.0
|
|
#define RSUBPIX_G 0.0
|
|
#define RSUBPIX_B 0.0
|
|
#define GSUBPIX_R 0.0
|
|
#define GSUBPIX_G 1.0
|
|
#define GSUBPIX_B 0.0
|
|
#define BSUBPIX_R 0.0
|
|
#define BSUBPIX_G 0.0
|
|
#define BSUBPIX_B 1.0
|
|
#define gain 1.0
|
|
#define gamma 3.0
|
|
#define blacklevel 0.05
|
|
#define ambient 0.0
|
|
#define BGR 0.0
|
|
|
|
#define outgamma 2.2
|
|
|
|
#define fetch_offset(coord,offset) (pow(vec3(gain) * texelFetchOffset(Source, (coord), 0, (offset)).rgb + vec3(blacklevel), vec3(gamma)) + vec3(ambient))
|
|
|
|
#pragma stage vertex
|
|
layout(location = 0) in vec4 Position;
|
|
layout(location = 1) in vec2 TexCoord;
|
|
layout(location = 0) out vec2 vTexCoord;
|
|
|
|
void main()
|
|
{
|
|
gl_Position = global.MVP * Position;
|
|
vTexCoord = TexCoord;
|
|
}
|
|
|
|
#pragma stage fragment
|
|
layout(location = 0) in vec2 vTexCoord;
|
|
layout(location = 0) out vec4 FragColor;
|
|
layout(set = 0, binding = 2) uniform sampler2D Source;
|
|
|
|
// integral of (1 - x^2 - x^4 + x^6)^2
|
|
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);
|
|
// integral of (1 - 2x^4 + x^6)^2
|
|
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);
|
|
|
|
float intsmear_func(float z, float coeffs[7])
|
|
{
|
|
float z2 = z*z;
|
|
float zn = z;
|
|
float ret = 0.0;
|
|
for (int i = 0; i < 7; i++) {
|
|
ret += zn*coeffs[i];
|
|
zn *= z2;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
float intsmear(float x, float dx, float d, float coeffs[7])
|
|
{
|
|
float zl = clamp((x-dx*0.5)/d,-1.0,1.0);
|
|
float zh = clamp((x+dx*0.5)/d,-1.0,1.0);
|
|
return d * ( intsmear_func(zh,coeffs) - intsmear_func(zl,coeffs) )/dx;
|
|
}
|
|
|
|
void main()
|
|
{
|
|
vec2 texelSize = global.SourceSize.zw;
|
|
vec2 range;
|
|
range = global.SourceSize.xy / (global.OutputSize.xy * global.SourceSize.xy);
|
|
|
|
vec3 cred = pow(vec3(RSUBPIX_R, RSUBPIX_G, RSUBPIX_B), vec3(outgamma));
|
|
vec3 cgreen = pow(vec3(GSUBPIX_R, GSUBPIX_G, GSUBPIX_B), vec3(outgamma));
|
|
vec3 cblue = pow(vec3(BSUBPIX_R, BSUBPIX_G, BSUBPIX_B), vec3(outgamma));
|
|
|
|
ivec2 tli = ivec2(floor(vTexCoord/texelSize-vec2(0.4999)));
|
|
|
|
vec3 lcol, rcol;
|
|
float subpix = (vTexCoord.x/texelSize.x - 0.4999 - float(tli.x))*3.0;
|
|
float rsubpix = range.x/texelSize.x * 3.0;
|
|
|
|
lcol = vec3(intsmear(subpix+1.0,rsubpix, 1.5, coeffs_x),
|
|
intsmear(subpix ,rsubpix, 1.5, coeffs_x),
|
|
intsmear(subpix-1.0,rsubpix, 1.5, coeffs_x));
|
|
rcol = vec3(intsmear(subpix-2.0,rsubpix, 1.5, coeffs_x),
|
|
intsmear(subpix-3.0,rsubpix, 1.5, coeffs_x),
|
|
intsmear(subpix-4.0,rsubpix, 1.5, coeffs_x));
|
|
|
|
if (BGR > 0.5) {
|
|
lcol.rgb = lcol.bgr;
|
|
rcol.rgb = rcol.bgr;
|
|
}
|
|
|
|
float tcol, bcol;
|
|
subpix = vTexCoord.y/texelSize.y - 0.4999 - float(tli.y);
|
|
rsubpix = range.y/texelSize.y;
|
|
tcol = intsmear(subpix ,rsubpix, 0.63, coeffs_y);
|
|
bcol = intsmear(subpix-1.0,rsubpix, 0.63, coeffs_y);
|
|
|
|
vec3 topLeftColor = fetch_offset(tli, ivec2(0,0)) * lcol * vec3(tcol);
|
|
vec3 bottomRightColor = fetch_offset(tli, ivec2(1,1)) * rcol * vec3(bcol);
|
|
vec3 bottomLeftColor = fetch_offset(tli, ivec2(0,1)) * lcol * vec3(bcol);
|
|
vec3 topRightColor = fetch_offset(tli, ivec2(1,0)) * rcol * vec3(tcol);
|
|
|
|
vec3 averageColor = topLeftColor + bottomRightColor + bottomLeftColor + topRightColor;
|
|
|
|
averageColor = averageColor * mat3(cred, cgreen, cblue);
|
|
|
|
FragColor = vec4(pow(averageColor,vec3(1.0/outgamma)),0.0);
|
|
} |