mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 23:17:25 +01:00
117 lines
2.8 KiB
GLSL
117 lines
2.8 KiB
GLSL
//
|
|
// Simple passthrough fragment shader
|
|
//
|
|
varying vec2 v_vTexcoord;
|
|
varying vec4 v_vColour;
|
|
|
|
uniform float w_curve[64];
|
|
uniform int w_amount;
|
|
|
|
uniform float r_curve[64];
|
|
uniform int r_amount;
|
|
|
|
uniform float g_curve[64];
|
|
uniform int g_amount;
|
|
|
|
uniform float b_curve[64];
|
|
uniform int b_amount;
|
|
|
|
float eval_curve_segment_t(in float _y0, in float ax0, in float ay0, in float bx1, in float by1, in float _y1, in float prog) {
|
|
return _y0 * pow(1. - prog, 3.) +
|
|
ay0 * 3. * pow(1. - prog, 2.) * prog +
|
|
by1 * 3. * (1. - prog) * pow(prog, 2.) +
|
|
_y1 * pow(prog, 3.);
|
|
}
|
|
|
|
float eval_curve_segment_x(in float _y0, in float ax0, in float ay0, in float bx1, in float by1, in float _y1, in float _x) {
|
|
float st = 0.;
|
|
float ed = 1.;
|
|
float _prec = 0.0001;
|
|
|
|
float _xt = _x;
|
|
int _binRep = 8;
|
|
|
|
if(_x <= 0.) return _y0;
|
|
if(_x >= 1.) return _y1;
|
|
if(_y0 == ay0 && _y0 == by1 && _y0 == _y1) return _y0;
|
|
|
|
for(int i = 0; i < _binRep; i++) {
|
|
float _ftx = 3. * pow(1. - _xt, 2.) * _xt * ax0
|
|
+ 3. * (1. - _xt) * pow(_xt, 2.) * bx1
|
|
+ pow(_xt, 3.);
|
|
|
|
if(abs(_ftx - _x) < _prec)
|
|
return eval_curve_segment_t(_y0, ax0, ay0, bx1, by1, _y1, _xt);
|
|
|
|
if(_xt < _x) st = _xt;
|
|
else ed = _xt;
|
|
|
|
_xt = (st + ed) / 2.;
|
|
}
|
|
|
|
int _newRep = 16;
|
|
|
|
for(int i = 0; i < _newRep; i++) {
|
|
float slope = ( 9. * ax0 - 9. * bx1 + 3.) * _xt * _xt
|
|
+ (-12. * ax0 + 6. * bx1) * _xt
|
|
+ 3. * ax0;
|
|
float _ftx = 3. * pow(1. - _xt, 2.) * _xt * ax0
|
|
+ 3. * (1. - _xt) * pow(_xt, 2.) * bx1
|
|
+ pow(_xt, 3.)
|
|
- _x;
|
|
|
|
_xt -= _ftx / slope;
|
|
|
|
if(abs(_ftx) < _prec)
|
|
break;
|
|
}
|
|
|
|
_xt = clamp(_xt, 0., 1.);
|
|
return eval_curve_segment_t(_y0, ax0, ay0, bx1, by1, _y1, _xt);
|
|
}
|
|
|
|
float curveEval(in float[64] curve, in int amo, in float _x) {
|
|
_x = clamp(_x, 0., 1.);
|
|
int segments = amo / 6 - 1;
|
|
|
|
for( int i = 0; i < segments; i++ ) {
|
|
int ind = i * 6;
|
|
float _x0 = curve[ind + 2];
|
|
float _y0 = curve[ind + 3];
|
|
//float bx0 = _x0 + curve[ind + 0];
|
|
//float by0 = _y0 + curve[ind + 1];
|
|
float ax0 = _x0 + curve[ind + 4];
|
|
float ay0 = _y0 + curve[ind + 5];
|
|
|
|
float _x1 = curve[ind + 6 + 2];
|
|
float _y1 = curve[ind + 6 + 3];
|
|
float bx1 = _x1 + curve[ind + 6 + 0];
|
|
float by1 = _y1 + curve[ind + 6 + 1];
|
|
//float ax1 = _x1 + curve[ind + 6 + 4];
|
|
//float ay1 = _y1 + curve[ind + 6 + 5];
|
|
|
|
if(_x < _x0) continue;
|
|
if(_x > _x1) continue;
|
|
|
|
return eval_curve_segment_x(_y0, ax0, ay0, bx1, by1, _y1, (_x - _x0) / (_x1 - _x0));
|
|
}
|
|
|
|
return curve[0];
|
|
}
|
|
|
|
void main() {
|
|
vec4 col = texture2D( gm_BaseTexture, v_vTexcoord );
|
|
|
|
col.r = curveEval(r_curve, r_amount, col.r);
|
|
col.g = curveEval(g_curve, g_amount, col.g);
|
|
col.b = curveEval(b_curve, b_amount, col.b);
|
|
|
|
float w = (col.r + col.g + col.b) / 3.;
|
|
float wtarget = curveEval(w_curve, w_amount, w);
|
|
|
|
col.r *= wtarget / w;
|
|
col.g *= wtarget / w;
|
|
col.b *= wtarget / w;
|
|
|
|
gl_FragColor = col;
|
|
}
|