started working on a boss room.

src/shaders/fire_light.gdshader

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+shader_type canvas_item;
+
+uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
+uniform float brightness_multiplier : hint_range(1.0, 10.0) = 3.0;
+
+void fragment() {
+    // 1. Get the color of the darkened floor behind the sprite
+    vec4 background = texture(screen_texture, SCREEN_UV);
+    
+    // 2. Get the shape/fading of your light texture
+    // We use the 'r' channel or 'a' channel depending on your sprite
+    float mask = texture(TEXTURE, UV).a;
+    
+    // 3. Instead of adding white, we multiply the background pixels
+    // This restores the original colors of your tiles
+    vec3 light_effect = background.rgb * (1.0 + (mask * brightness_multiplier));
+    
+    // 4. Output the result
+    COLOR = vec4(light_effect, 1.0);
+}

src/shaders/fire_light.gdshader.uid

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+uid://c40fb6mfe76g3