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/* Material Parameters packed in an UBO */
struct Material {
vec4 one;
vec4 two;
};
layout(std140) uniform material_block {
Material shader_param[MAX_MATERIAL];
};
uniform mat4 ProjectionMatrix;
uniform sampler2DArray matcaps;
uniform int mat_id;
#define randomness shader_param[mat_id].one.x
#define matcap_index shader_param[mat_id].one.y
#define matcap_rotation shader_param[mat_id].one.zw
#define matcap_hsv shader_param[mat_id].two.xyz
in vec3 tangent;
in vec3 viewPosition;
flat in float colRand;
out vec4 fragColor;
vec3 rotate(vec3 norm, vec3 ortho, float ang)
{
return norm * cos(ang) + ortho * sin(ang);
}
void rgb_to_hsv(vec3 rgb, out vec3 outcol)
{
float cmax, cmin, h, s, v, cdelta;
vec3 c;
cmax = max(rgb[0], max(rgb[1], rgb[2]));
cmin = min(rgb[0], min(rgb[1], rgb[2]));
cdelta = cmax - cmin;
v = cmax;
if (cmax != 0.0)
s = cdelta / cmax;
else {
s = 0.0;
h = 0.0;
}
if (s == 0.0) {
h = 0.0;
}
else {
c = (vec3(cmax, cmax, cmax) - rgb.xyz) / cdelta;
if (rgb.x == cmax) h = c[2] - c[1];
else if (rgb.y == cmax) h = 2.0 + c[0] - c[2];
else h = 4.0 + c[1] - c[0];
h /= 6.0;
if (h < 0.0)
h += 1.0;
}
outcol = vec3(h, s, v);
}
void hsv_to_rgb(vec3 hsv, out vec3 outcol)
{
float i, f, p, q, t, h, s, v;
vec3 rgb;
h = hsv[0];
s = hsv[1];
v = hsv[2];
if (s == 0.0) {
rgb = vec3(v, v, v);
}
else {
if (h == 1.0)
h = 0.0;
h *= 6.0;
i = floor(h);
f = h - i;
rgb = vec3(f, f, f);
p = v * (1.0 - s);
q = v * (1.0 - (s * f));
t = v * (1.0 - (s * (1.0 - f)));
if (i == 0.0) rgb = vec3(v, t, p);
else if (i == 1.0) rgb = vec3(q, v, p);
else if (i == 2.0) rgb = vec3(p, v, t);
else if (i == 3.0) rgb = vec3(p, q, v);
else if (i == 4.0) rgb = vec3(t, p, v);
else rgb = vec3(v, p, q);
}
outcol = rgb;
}
void hue_sat(float hue, float sat, float value, inout vec3 col)
{
vec3 hsv;
rgb_to_hsv(col, hsv);
hsv.x += hue;
hsv.x -= floor(hsv.x);
hsv.y *= sat;
hsv.y = clamp(hsv.y, 0.0, 1.0);
hsv.z *= value;
hsv.z = clamp(hsv.z, 0.0, 1.0);
hsv_to_rgb(hsv, col);
}
void main()
{
vec3 viewvec = (ProjectionMatrix[3][3] == 0.0) ? normalize(viewPosition) : vec3(0.0, 0.0, -1.0);
vec3 ortho = normalize(cross(viewvec, tangent));
vec3 norm = normalize(cross(ortho, tangent));
vec3 col = vec3(0);
vec2 rotY = vec2(-matcap_rotation.y, matcap_rotation.x);
for (int i = 0; i < 9; i++) {
vec3 rotNorm = rotate(norm, ortho, -0.5 + (i * 0.125));
vec3 ray = reflect(viewvec, rotNorm);
vec2 texco = abs(vec2(dot(ray.xy, matcap_rotation), dot(ray.xy, rotY)) * .49 + 0.5);
col += texture(matcaps, vec3(texco, matcap_index)).rgb / 9.0;
}
hue_sat(matcap_hsv.x, matcap_hsv.y, matcap_hsv.z, col);
float maxChan = max(max(col.r, col.g), col.b);
col += (colRand * maxChan * randomness * 1.5) - (maxChan * randomness * 0.75);
fragColor.rgb = col;
fragColor.a = 1.0;
}
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