43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
shader_type canvas_item;
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uniform sampler2D tex : repeat_enable;
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uniform float n_rows = 6.0;
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uniform float y_offset = 0.0;
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uniform float x_offset = 0.0;
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uniform float win_intensity : hint_range(0.0, 1.0) = 0.0;
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uniform vec4 win_glow_color : source_color = vec4(1.0, 0.62, 0.08, 1.0);
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void fragment() {
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vec2 uv = UV;
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uv.x += x_offset;
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uv.y /= n_rows;
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uv.y += y_offset;
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vec4 base = texture(tex, uv);
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if (win_intensity <= 0.001) {
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COLOR = base;
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} else {
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// Derive a compact halo from the existing symbol alpha so no replacement
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// sprite or second texture is needed.
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vec2 pixel = 1.0 / vec2(textureSize(tex, 0));
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vec2 radius = pixel * 5.0;
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float nearby_alpha = 0.0;
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nearby_alpha = max(nearby_alpha, texture(tex, uv + vec2(radius.x, 0.0)).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv - vec2(radius.x, 0.0)).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv + vec2(0.0, radius.y)).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv - vec2(0.0, radius.y)).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv + radius).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv - radius).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv + vec2(radius.x, -radius.y)).a);
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nearby_alpha = max(nearby_alpha, texture(tex, uv + vec2(-radius.x, radius.y)).a);
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float halo = max(nearby_alpha - base.a, 0.0) * win_intensity;
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float flash = smoothstep(0.82, 1.0, win_intensity);
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vec3 rich_color = min(base.rgb * 1.18 + win_glow_color.rgb * 0.12, vec3(1.0));
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vec3 symbol_color = mix(base.rgb, rich_color, win_intensity);
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symbol_color = mix(symbol_color, vec3(1.0), flash * 0.34 * base.a);
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vec3 final_rgb = symbol_color * base.a + win_glow_color.rgb * halo;
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COLOR = vec4(final_rgb, max(base.a, halo * 0.9));
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}
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}
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