Pixel-Composer/shaders/sh_blend_min/sh_blend_min.fsh
2023-01-01 08:06:02 +07:00

42 lines
844 B
GLSL

//
// Simple passthrough fragment shader
//
varying vec2 v_vTexcoord;
varying vec4 v_vColour;
uniform vec2 dimension;
uniform int tile_type;
uniform int useMask;
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;
}
void main() {
vec4 _col0 = texture2D( gm_BaseTexture, v_vTexcoord );
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 );
_col1 *= opacity * sampleMask();
vec4 res;
res.r = min(_col0.r, _col1.r);
res.g = min(_col0.g, _col1.g);
res.b = min(_col0.b, _col1.b);
res.a = min(_col0.a, _col1.a);
gl_FragColor = res;
}