35 lines
966 B
Text
35 lines
966 B
Text
shader_type canvas_item;
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uniform float size = 512.0;
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uniform sampler2D input_texture;
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vec2 pack_4x8_to_2x16(vec4 s) {
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return s.rg + s.ba/256.0;
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}
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float input_in(vec2 uv) {
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vec4 lodded_texture = textureLod(input_texture, uv, 0.0);
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return lodded_texture.x;
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}
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vec3 fct(vec2 uv) {
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vec3 e = vec3(1.0 / size, -1.0 / size, 0);
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vec2 rv = vec2(1.0, -1.0) * input_in(uv + e.xy);
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rv += vec2(-1.0, 1.0) * input_in(uv - e.xy);
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rv += vec2(1.0, 1.0) * input_in(uv + e.xx);
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rv += vec2(-1.0, -1.0) * input_in(uv - e.xx);
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rv += vec2(2.0, 0.0) * input_in(uv + e.xz);
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rv += vec2(-2.0, 0.0) * input_in(uv - e.xz);
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rv += vec2(0.0, 2.0) * input_in(uv + e.zx);
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rv += vec2(0.0, -2.0) * input_in(uv - e.zx);
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return vec3(rv, 0.0);
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}
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vec3 process_normal(vec3 v, float multiplier) {
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return 0.5 * normalize(v.xyz * multiplier + vec3(0.0, 0.0, -1.0)) + vec3(0.5);
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}
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void fragment() {
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vec3 normal_map = process_normal(fct((UV)), size / 128.0);
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COLOR = vec4(normal_map, 1.0);
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}
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