34 lines
1.2 KiB
Text
34 lines
1.2 KiB
Text
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shader_type canvas_item;
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render_mode unshaded;
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uniform vec4 viewport_rect;
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uniform sampler2D occlusion_mask;
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uniform vec4 occlusion_rect;
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uniform float cell_div = 0.03125; // 1/cell_size = 1/32
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uniform float diffusion = 0.3;
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uniform float scale_factor = 0.5;
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float tile_at(vec2 coord, vec2 camera_tile_offset, vec2 occlusion_div) {
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return texture(occlusion_mask, (coord * cell_div - occlusion_rect.xy) * occlusion_div + camera_tile_offset).r;
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}
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void fragment() {
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vec2 occlusion_div = 1.0 / occlusion_rect.zw;
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vec2 camera_offset = viewport_rect.xy * scale_factor;
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vec2 camera_tile_offset = camera_offset * cell_div * occlusion_div;
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vec2 coords = UV.xy * viewport_rect.zw * scale_factor;
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float tile = tile_at(coords, camera_tile_offset, occlusion_div);
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vec4 ray_coords = vec4(0,0, viewport_rect.zw/2.) * scale_factor;
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vec2 ray_dir = normalize(ray_coords.zw - ray_coords.xy);
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if (int(coords.x+camera_offset.x) % 32 < 1 || int(coords.y+camera_offset.y) % 32 < 1) {
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COLOR = vec4(1);
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} else if (distance(coords, ray_coords.xy) < 10.0 || distance(coords, ray_coords.zw) < 10.) {
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COLOR = vec4(0,1,0,1);
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} else if (tile >= diffusion) {
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COLOR = vec4(1,0,0,1);
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} else {
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COLOR = texture(SCREEN_TEXTURE, SCREEN_UV);
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}
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}
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