58 lines
1.4 KiB
Plaintext
58 lines
1.4 KiB
Plaintext
shader_type spatial;
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const int MAP_COUNT = 4;
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uniform sampler2D[MAP_COUNT] ALBEDO_MAPS;
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uniform float HEIGHT_SCALE = 100.0;
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uniform sampler2D[MAP_COUNT] NORMAL_MAPS;
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uniform vec2 SIZE;
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uniform sampler2D TERRAIN_MAP : hint_default_transparent, repeat_disable;
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void fragment() {
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vec2 uv = UV * (SIZE / 2.0);
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vec2 uv_alt = uv * -0.5;
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vec3 splat_map = texture(TERRAIN_MAP, UV).rgb;
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float blank = clamp(1.0 - splat_map.r - splat_map.g - splat_map.b, 0.0, 1.0);
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ALBEDO = blank * 0.5 * (texture(ALBEDO_MAPS[0], uv).rgb + texture(ALBEDO_MAPS[0], uv_alt).rgb);
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for (int i = 0; i < (MAP_COUNT - 1); i += 1) {
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int map_index = i + 1;
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ALBEDO += splat_map[i] * 0.5 * (texture(ALBEDO_MAPS[map_index], uv).rgb +
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texture(ALBEDO_MAPS[map_index], uv_alt).rgb);
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}
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NORMAL_MAP = blank * 0.5 *
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(texture(NORMAL_MAPS[0], uv).rgb + texture(NORMAL_MAPS[0], uv_alt).rgb);
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for (int i = 0; i < (MAP_COUNT - 1); i += 1) {
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int map_index = i + 1;
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NORMAL_MAP += splat_map[i] * 0.5 * (texture(NORMAL_MAPS[map_index], uv).rgb +
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texture(NORMAL_MAPS[map_index], uv_alt).rgb);
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}
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}
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float height(vec2 uv) {
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return HEIGHT_SCALE * texture(TERRAIN_MAP, uv).a;
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}
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void vertex() {
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VERTEX.y = height(UV);
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vec2 texel_size = UV / SIZE;
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vec4 h = vec4(
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height(UV + (texel_size * vec2(0, -1))),
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height(UV + (texel_size * vec2(-1, 0))),
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height(UV + (texel_size * vec2( 1, 0))),
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height(UV + (texel_size * vec2( 0, 1))));
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NORMAL = normalize(vec3(h.y - h.z, 2.0, h.x - h.w));
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}
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