20 lines
472 B
Text
20 lines
472 B
Text
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shader_type canvas_item;
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render_mode blend_disabled;
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uniform sampler2D u_src_texture;
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uniform vec4 u_src_rect;
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uniform float u_opacity = 1.0;
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uniform float u_value = 1.0;
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vec2 get_src_uv(vec2 screen_uv) {
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vec2 uv = u_src_rect.xy + screen_uv * u_src_rect.zw;
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return uv;
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}
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void fragment() {
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float brush_value = u_opacity * texture(TEXTURE, UV).r;
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vec4 src = texture(u_src_texture, get_src_uv(SCREEN_UV));
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COLOR = vec4(src.rgb, mix(src.a, u_value, brush_value));
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}
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