nandi.uk
This repository has no description
1.1 kB
47 lines
1// masking
2instance uniform bool has_mask = false;
3instance uniform bool invert;
4uniform sampler2D tex_mask : filter_linear_mipmap, repeat_disable;
5uniform float mask_scale = 1.0;
6uniform vec2 canvas_size = vec2(2,2);
7uniform vec2 mesh_offset = vec2(0,0);
8
9varying vec2 MASK_UV;
10varying vec4 modulate;
11
12bool discard_mask() {
13 if(has_mask) {
14 if (MASK_UV.x > 1.0 || MASK_UV.y > 1.0 || MASK_UV.x < 0.0 || MASK_UV.y < 0.0) {
15 return true;
16 }
17 }
18 return false;
19}
20
21vec2 mask_uv(vec2 vtx) {
22 if (!has_mask) {
23 return vec2(0,0);
24 }
25
26 vec2 mask_size = vec2(textureSize(tex_mask, 0)) / mask_scale;
27 vec2 mask_vtx = vtx - mesh_offset;
28 return mask_vtx / mask_size;
29}
30
31vec4 sample_mask(vec4 color_tex, vec4 base) {
32 vec4 color_for_mask = color_tex * base;
33 color_for_mask.rgb = color_for_mask.rgb * color_for_mask.a;
34
35 vec4 clip_mask = texture(tex_mask, MASK_UV) * vec4(0,0,0,1);
36
37 float mask_val = clip_mask.r + clip_mask.g + clip_mask.b + clip_mask.a;
38 if (invert) {
39 mask_val = 1.0 - mask_val;
40 }
41 return color_for_mask * mask_val;
42}
43
44void vertex() {
45 MASK_UV = mask_uv(VERTEX.xy);
46 modulate = COLOR;
47}