38 lines
1.2 KiB
Plaintext
38 lines
1.2 KiB
Plaintext
shader_type canvas_item;
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uniform vec4 drop_shadow_color : source_color = vec4(vec3(0), float(0.5));
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uniform vec2 shadow_offset = vec2(float(0), float(0.1));
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varying vec4 modulate;
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void vertex() {
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modulate = COLOR;
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float max_offset = abs(shadow_offset.x);
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if (abs(shadow_offset.y) > abs(shadow_offset.x)) {
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max_offset = abs(shadow_offset.y);
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}
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VERTEX *= float(1) + float(2) * max_offset;
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}
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vec4 sample_texture(sampler2D texture, vec2 uv) {
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if ((uv.x < 0.0 || uv.x > 1.0) || (uv.y < 0.0 || uv.y > 1.0)) {
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return vec4(0.0);
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} else {
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return texture(texture, uv);
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}
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}
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vec4 mixcolor(vec4 colA, vec4 colB) {
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return vec4((colA.rgb + colB.a * (colB.rgb - colA.rgb)), colA.a + colB.a);
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}
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void fragment() {
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float max_offset = abs(shadow_offset.x);
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if (abs(shadow_offset.y) > abs(shadow_offset.x)) {
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max_offset = abs(shadow_offset.y);
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}
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vec2 uv = UV * float(float(1) + float(2) * max_offset) - vec2(max_offset);
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vec4 original_color = sample_texture(TEXTURE, uv) * modulate;
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vec4 shadow_color = vec4(drop_shadow_color.rgb, sample_texture(TEXTURE, uv - shadow_offset).a * drop_shadow_color.a);
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if (shadow_color.a > float(0)) {
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COLOR = mixcolor(shadow_color, original_color);
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} else {
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COLOR = original_color;
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}
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} |