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shader.frag
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shader.frag
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precision highp float;
varying vec2 vTextureCoord;
uniform sampler2D uSampler;
uniform float uSlider;
uniform int uColorized;
uniform int uSelectColormap;
uniform int uHsv;
uniform int uColormap;
vec4 greyscale_colormap(float n) {
vec2 x = vec2(0.0, 1.0);
vec3 y0 = vec3(0.0, 0.0, 0.0);
vec3 y1 = vec3(255.0, 255.0, 255.0) / 255.0;
return vec4(
(n - x[0]) / (x[1] - x[0]) * (y1[0] - y0[0]) + y0[0],
(n - x[0]) / (x[1] - x[0]) * (y1[1] - y0[1]) + y0[1],
(n - x[0]) / (x[1] - x[0]) * (y1[2] - y0[2]) + y0[2],
1.0);
}
vec4 color_colormap(float n) {
vec2 x = vec2(0.0, 0.5);
vec3 y0 = vec3(0.0, 0.0, 255.0) / 255.0;
vec3 y1 = vec3(38.0, 195.0, 195.0) / 255.0;
if ((n >= 0.5) && (n < 0.75)) {
x = vec2(0.5, 0.75);
y0 = vec3(0.0, 150.0, 0.0) / 255.0;
y1 = vec3(255.0, 255.0, 0.0) / 255.0;
} else if (n >= 0.75) {
x = vec2(0.75, 1.0);
y0 = vec3(255.0, 255.0, 0.0) / 255.0;
y1 = vec3(255.0, 50.0, 50.0) / 255.0;
}
return vec4(
(n - x[0]) / (x[1] - x[0]) * (y1[0] - y0[0]) + y0[0],
(n - x[0]) / (x[1] - x[0]) * (y1[1] - y0[1]) + y0[1],
(n - x[0]) / (x[1] - x[0]) * (y1[2] - y0[2]) + y0[2],
1.0);
}
vec4 color_colormap2(float n) {
vec2 x = vec2(0.0, 0.1);
vec3 y0 = vec3(0.0, 0.0, 255.0) / 255.0;
vec3 y1 = vec3(0.0, 0.0, 255.0) / 255.0;
if ((n >= 0.1) && (n < 0.5)) {
x = vec2(0.1, 0.5);
y0 = vec3(0.0, 0.0, 255.0) / 255.0;
y1 = vec3(38.0, 195.0, 195.0) / 255.0;
} else if ((n >= 0.5) && (n < 0.7)) {
x = vec2(0.5, 0.7);
y0 = vec3(0.0, 150.0, 0.0) / 255.0;
y1 = vec3(255.0, 255.0, 0.0) / 255.0;
} else if ((n >= 0.7) && (n < 0.9)) {
x = vec2(0.7, 0.9);
y0 = vec3(255.0, 255.0, 0.0) / 255.0;
y1 = vec3(255.0, 50.0, 50.0) / 255.0;
} else if (n >= 0.9) {
x = vec2(0.9, 1.0);
y0 = vec3(255.0, 50.0, 50.0) / 255.0;
y1 = vec3(255.0, 50.0, 50.0) / 255.0;
}
return vec4(
(n - x[0]) / (x[1] - x[0]) * (y1[0] - y0[0]) + y0[0],
(n - x[0]) / (x[1] - x[0]) * (y1[1] - y0[1]) + y0[1],
(n - x[0]) / (x[1] - x[0]) * (y1[2] - y0[2]) + y0[2],
1.0);
}
vec4 rgb2hsv(vec4 c) {
vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
float d = q.x - min(q.w, q.y);
float e = 1.0e-10;
return vec4(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x, 1.0);
}
vec4 hsv2rgb(vec4 c) {
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return vec4(c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y), 1.0);
}
void main(void) {
vec4 color = texture2D(uSampler, vTextureCoord);
if (uColormap == 1) {
color = vec4(vTextureCoord, 0.0, 0.0);
} else if (uHsv == 1) {
color = rgb2hsv(color);
}
float x = uSlider;
float r = color.r;
float g = color.g;
float b = color.b;
float rr = @1@;
float gg = @2@;
float bb = @3@;
if (uColorized == 0) {
color = vec4(rr, gg, bb, 1.0);
gl_FragColor = (uHsv == 0) ? color : hsv2rgb(color);
} else {
if (uSelectColormap == 0) {
gl_FragColor = color_colormap(rr);
} else if (uSelectColormap == 1) {
gl_FragColor = greyscale_colormap(rr);
} else {
gl_FragColor = color_colormap2(rr);
}
}
}