35 lines
1.0 KiB
Plaintext
35 lines
1.0 KiB
Plaintext
shader_type spatial;
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render_mode unshaded;
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uniform sampler2D sky_texture : source_color;
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uniform bool lock_aspect = false;
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uniform float aspect_ratio = 1.3333333;
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uniform vec2 fov = vec2(180.0, 90.0);
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uniform ivec2 tiling = ivec2(1, 1);
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uniform vec2 offset = vec2(0.0, 0.0);
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// XY offset, ZW tiling
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varying vec4 bg_coords;
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void vertex() {
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// Camera YX rotation per Basis.get_euler source code
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float y = atan(VIEW_MATRIX[0][2], VIEW_MATRIX[2][2]);
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float x = asin(VIEW_MATRIX[1][2]);
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// Map rotation to screen space
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bg_coords.xy = vec2(y * -0.5, x) / PI;
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bg_coords.y += 0.5;
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bg_coords.w = fov.y / 180.0;
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bg_coords.z = !lock_aspect ? fov.x / 360.0 : VIEWPORT_SIZE.x / (VIEWPORT_SIZE.y * aspect_ratio) * bg_coords.w;
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// Keep background centered vertically when FOV changes
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bg_coords.y *= bg_coords.w > 1.0 ? 0.0 : 1.0 - bg_coords.w;
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}
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void fragment() {
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vec2 uv_offset = vec2(-offset.x, offset.y);
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vec2 uv = (SCREEN_UV + uv_offset) * bg_coords.zw + bg_coords.xy;
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uv *= vec2(tiling);
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ALBEDO = texture(sky_texture, uv).rgb;
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} |