mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 23:17:25 +01:00
109 lines
2.2 KiB
GLSL
109 lines
2.2 KiB
GLSL
//
|
|
// Simple passthrough fragment shader
|
|
//
|
|
varying vec2 v_vTexcoord;
|
|
varying vec4 v_vColour;
|
|
|
|
uniform vec2 dimension;
|
|
uniform int tile_type;
|
|
|
|
uniform int useMask;
|
|
uniform int preserveAlpha;
|
|
uniform sampler2D mask;
|
|
uniform sampler2D fore;
|
|
uniform float opacity;
|
|
|
|
float sampleMask() {
|
|
if(useMask == 0) return 1.;
|
|
vec4 m = texture2D( mask, v_vTexcoord );
|
|
return (m.r + m.g + m.b) / 3. * m.a;
|
|
}
|
|
|
|
float hue2rgb( in float m1, in float m2, in float hue) {
|
|
if (hue < 0.0)
|
|
hue += 1.0;
|
|
else if (hue > 1.0)
|
|
hue -= 1.0;
|
|
|
|
if ((6.0 * hue) < 1.0)
|
|
return m1 + (m2 - m1) * hue * 6.0;
|
|
else if ((2.0 * hue) < 1.0)
|
|
return m2;
|
|
else if ((3.0 * hue) < 2.0)
|
|
return m1 + (m2 - m1) * ((2.0 / 3.0) - hue) * 6.0;
|
|
else
|
|
return m1;
|
|
}
|
|
|
|
vec3 hsl2rgb( in vec3 hsl ) {
|
|
float r, g, b;
|
|
if(hsl.y == 0.) {
|
|
r = hsl.z;
|
|
g = hsl.z;
|
|
b = hsl.z;
|
|
} else {
|
|
float m1, m2;
|
|
if(hsl.z <= 0.5)
|
|
m2 = hsl.z * (1. + hsl.y);
|
|
else
|
|
m2 = hsl.z + hsl.y - hsl.z * hsl.y;
|
|
m1 = 2. * hsl.z - m2;
|
|
|
|
r = hue2rgb(m1, m2, hsl.x + 1. / 3.);
|
|
g = hue2rgb(m1, m2, hsl.x);
|
|
b = hue2rgb(m1, m2, hsl.x - 1. / 3.);
|
|
}
|
|
|
|
return vec3( r, g, b );
|
|
}
|
|
|
|
vec3 rgb2hsl( in vec3 c ){
|
|
float h = 0.0;
|
|
float s = 0.0;
|
|
float l = 0.0;
|
|
float r = c.r;
|
|
float g = c.g;
|
|
float b = c.b;
|
|
float cMin = min( r, min( g, b ) );
|
|
float cMax = max( r, max( g, b ) );
|
|
|
|
l = ( cMax + cMin ) / 2.0;
|
|
if ( cMax > cMin ) {
|
|
float cDelta = cMax - cMin;
|
|
|
|
s = l < .5 ? cDelta / ( cMax + cMin ) : cDelta / ( 2.0 - ( cMax + cMin ) );
|
|
|
|
if ( r == cMax )
|
|
h = ( g - b ) / cDelta;
|
|
else if ( g == cMax )
|
|
h = 2.0 + ( b - r ) / cDelta;
|
|
else
|
|
h = 4.0 + ( r - g ) / cDelta;
|
|
|
|
if ( h < 0.0)
|
|
h += 6.0;
|
|
h = h / 6.0;
|
|
}
|
|
return vec3( h, s, l );
|
|
}
|
|
|
|
void main() {
|
|
vec4 _col0 = texture2D( gm_BaseTexture, v_vTexcoord );
|
|
vec3 _hsl0 = rgb2hsl(_col0.rgb);
|
|
|
|
vec2 fore_tex = v_vTexcoord;
|
|
if(tile_type == 0)
|
|
fore_tex = v_vTexcoord;
|
|
else if(tile_type == 1)
|
|
fore_tex = fract(v_vTexcoord * dimension);
|
|
|
|
vec4 _col1 = texture2D( fore, fore_tex );
|
|
vec3 _hsl1 = rgb2hsl(_col1.rgb);
|
|
|
|
_hsl0.z = mix(_hsl0.z, _hsl1.z, _col1.a * opacity * sampleMask());
|
|
|
|
vec4 res = vec4(hsl2rgb(_hsl0), _col0.a);
|
|
if(preserveAlpha == 1) res.a = _col0.a;
|
|
|
|
gl_FragColor = res;
|
|
}
|