37 lines
1.1 KiB
GLSL
37 lines
1.1 KiB
GLSL
#include "brush_common_decl.shader"
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GENERATED_CODE
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float brush(vec2 uv) {
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return clamp(brush_opacity*brush_function(uv)/(1.0-brush_hardness), 0.0, 1.0);
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}
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void fragment() {
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vec2 bs;
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vec2 bp;
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vec2 bpp;
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vec2 p;
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if (texture_space) {
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float min_size = min(rect_size.x, rect_size.y);
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bs = vec2(brush_size)/min_size;
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bp = brush_pos/min_size;
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bpp = brush_ppos/min_size;
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p = texture(view2tex_tex, UV).xy/bs;
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} else {
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bs = vec2(brush_size)/rect_size;
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bp = brush_pos/rect_size;
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bpp = brush_ppos/rect_size;
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p = UV/bs;
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}
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vec2 b = bp/bs;
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vec2 bv = (bpp-bp)/bs;
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float x = clamp(dot(p-b, bv)/dot(bv, bv), 0.0, 1.0);
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vec2 local_uv = p-(b+x*bv);
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vec2 local_uv2 = p-b-bv;
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mat2 texture_rotation = mat2(vec2(cos(pattern_angle), sin(pattern_angle)), vec2(-sin(pattern_angle), cos(pattern_angle)));
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local_uv = texture_rotation*local_uv;
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vec2 stamp_limit = step(abs(local_uv), vec2(1.0));
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float a = (0.2+0.8*texture(mask_tex, texture(view2tex_tex, UV).xy).r)*stamp_limit.x*stamp_limit.y;
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COLOR = vec4(1.0, 1.0, 1.0, a)*pattern_function(0.5*texture_rotation*local_uv2+vec2(0.5)) * vec4(vec3(1.0), brush(0.5*local_uv+vec2(0.5)));
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}
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