26 lines
716 B
Text
26 lines
716 B
Text
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shader_type canvas_item;
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#include "res://addons/zylann.hterrain/shaders/include/heightmap_rgb8_encoding.gdshaderinc"
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vec4 pack_normal(vec3 n) {
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return vec4((0.5 * (n + 1.0)).xzy, 1.0);
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}
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float get_height(sampler2D tex, vec2 uv) {
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return decode_height_from_rgb8_unorm(texture(tex, uv).rgb);
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}
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void fragment() {
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vec2 uv = UV;
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vec2 ps = TEXTURE_PIXEL_SIZE;
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float left = get_height(TEXTURE, uv + vec2(-ps.x, 0));
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float right = get_height(TEXTURE, uv + vec2(ps.x, 0));
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float back = get_height(TEXTURE, uv + vec2(0, -ps.y));
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float fore = get_height(TEXTURE, uv + vec2(0, ps.y));
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vec3 n = normalize(vec3(left - right, 2.0, fore - back));
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COLOR = pack_normal(n);
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// DEBUG
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//COLOR.r = fract(TIME * 100.0);
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}
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