39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
/*
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Asset: Godot Simple Portal System
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File: portal.gdshader
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Description: Shader used by the simple portal system.
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Repository: https://github.com/Donitzo/godot-simple-portal-system
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License: CC0 License
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*/
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shader_type spatial;
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render_mode unshaded;
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uniform float fade_out_distance_max = 10.0;
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uniform float fade_out_distance_min = 8.0;
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uniform vec4 fade_out_color = vec4(0.0);
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uniform sampler2D albedo:hint_default_black, source_color;
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varying float pixel_distance;
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void vertex() {
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// Calculate the world-space distance between the pixel and camera.
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// Pass the distance to the fragment shader using a varying attribute.
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vec3 world_position = (MODEL_MATRIX * vec4(VERTEX, 1.0)).xyz;
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vec3 camera_position = (INV_VIEW_MATRIX * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
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pixel_distance = distance(world_position, camera_position);
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}
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void fragment() {
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// The portal color is simply the screen-space color of the exit camera render target.
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// This is because the exit camera views the exit portal from the perspective of the player watching
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// the entrance portal, meaning the exit portal will occupy the same screen-space as the entrance portal.
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vec3 portal_color = texture(albedo, SCREEN_UV).rgb;
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// Fade-out color
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float t = smoothstep(fade_out_distance_min, fade_out_distance_max, pixel_distance);
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ALBEDO = mix(portal_color, fade_out_color.rgb, t);
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} |