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in vec4 fragTexCoord;
out vec4 fragOut0;
uniform sampler2D tex;
uniform sampler2D depth_tex;
layout (std140) uniform genericData {
float timer;
float noise_amount;
float saturation;
float brightness;
float contrast;
float film_grain;
float tv_stripes;
float cutoff;
vec3 tint;
float dither;
};
void main()
{
#ifdef FLAG_DISTORT_NOISE
// Distort noise
float distort_factor = timer * sin(fragTexCoord.x * fragTexCoord.y * 100.0 + timer);
distort_factor = mod(distort_factor, 8.0) * mod(distort_factor, 4.0);
vec2 distort;
distort = vec2(mod(distort_factor, noise_amount), mod(distort_factor, noise_amount + 0.002));
#else
vec2 distort = vec2(0, 0);
#endif
// Global constant
vec4 color_in = texture(tex, fragTexCoord.xy + distort);
vec4 color_out;
#ifdef FLAG_SATURATION
// Saturation
vec4 color_grayscale = color_in;
color_grayscale.rgb = vec3(dot(color_in.rgb, vec3(0.299, 0.587, 0.184)));
color_out = mix(color_in, color_grayscale, 1.0 - saturation);
#else
color_out = color_in;
#endif
#ifdef FLAG_BRIGHTNESS
// Brightness
vec3 Afactor = vec3(brightness);
color_out.rgb = color_out.rgb * Afactor;
#endif
#ifdef FLAG_CONTRAST
// Contrast
vec3 Bfactor = vec3(0.5 - 0.5 * contrast);
color_out.rgb = color_out.rgb + Bfactor;
#endif
#ifdef FLAG_GRAIN
// Film Grain
float x = fragTexCoord.x * fragTexCoord.y * timer * 1000.0;
x = mod(x, 13.0) * mod(x, 123.0);
float dx = mod(x, 0.01);
vec3 result = color_out.rgb + color_out.rgb * clamp(0.1 + dx * 100.0, 0.0, 1.0);
color_out.rgb = mix(color_out.rgb, result, film_grain);
#endif
#ifdef FLAG_STRIPES
// TV-Stripes (Old School)
vec2 sc;
sc.x = sin(fragTexCoord.y * 2048.0);
sc.y = cos(fragTexCoord.y * 2048.0);
vec3 stripes = color_out.rgb + color_out.rgb * vec3(sc.x, sc.y, sc.x) * 0.8;
color_out.rgb = mix(color_out.rgb, stripes, tv_stripes);
#endif
#ifdef FLAG_CUTOFF
// Experimental cutoff shader
if (cutoff > 0.0) {
vec4 color_greyscale;
color_greyscale.rgb = vec3(dot(color_in.rgb, vec3(0.299, 0.587, 0.184)));
vec4 normalized_col;
float col_length = (length(color_out.rgb));
if (col_length > 1.0) {
normalized_col = ((color_out)/col_length);
} else {
normalized_col = color_out;
}
vec3 unit_grey = vec3(0.5773);
float sat = dot(normalized_col.rgb, unit_grey);
color_out = mix(color_greyscale, color_out, sat * cutoff);
}
#endif
#ifdef FLAG_DITH
// Dithering
float downsampling_factor = 4;
float bias = 0.5;
color_out.rgb = floor(color_out.rgb * downsampling_factor + bias) / downsampling_factor;
#endif
#ifdef FLAG_TINT
color_out.rgb += tint;
#endif
color_out.a = 1.0;
fragOut0 = color_out;
}
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