27 lines
805 B
Text
27 lines
805 B
Text
shader_type canvas_item;
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render_mode blend_disabled;
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#include "res://addons/zylann.hterrain/shaders/include/heightmap.gdshaderinc"
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//uniform sampler2D u_screen_texture : hint_screen_texture;
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uniform sampler2D u_previous_pass;
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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 sample_height_from_viewport(tex, uv);
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}
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void fragment() {
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vec2 uv = SCREEN_UV;
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vec2 ps = SCREEN_PIXEL_SIZE;
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float left = get_height(u_previous_pass, uv + vec2(-ps.x, 0));
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float right = get_height(u_previous_pass, uv + vec2(ps.x, 0));
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float back = get_height(u_previous_pass, uv + vec2(0, -ps.y));
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float fore = get_height(u_previous_pass, 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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}
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