Add some cool shaders

shaders/outline.gdshader

@@ -1,23 +1,25 @@
-shader_type spatial;
-render_mode cull_front, unshaded;
+@shader_type spatial;
+@render_mode unshaded;
 
-uniform vec4 outline_color : source_color;
-uniform float outline_width = 1.0;
-
-void vertex() {
-	vec4 clip_position = PROJECTION_MATRIX * (MODELVIEW_MATRIX * vec4(VERTEX, 1.0));
-	vec3 clip_normal = mat3(PROJECTION_MATRIX) * (mat3(MODELVIEW_MATRIX) * NORMAL);
-
-	vec2 offset = normalize(clip_normal.xy) / VIEWPORT_SIZE * clip_position.w * outline_width * 2.0;
-
-	clip_position.xy += offset;
-
-	POSITION = clip_position;
-}
+@uniform sampler2D albedo_texture;
+@uniform vec3 light_color = vec3(1.0, 1.0, 1.0);
+@uniform float outline_width = 0.05;
+@uniform vec3 outline_color = vec3(0.0, 0.0, 0.0);
 
 void fragment() {
-	ALBEDO = outline_color.rgb;
-	if (outline_color.a < 1.0) {
-		ALPHA = outline_color.a;
-	}
-}
+    // Fake directional light
+    vec3 light_dir = normalize(vec3(0.5, 1.0, -0.5)); 
+    vec3 norm = normalize(NORMAL);
+    float intensity = dot(norm, light_dir);
+
+    // Cel shading - Quantized lighting steps
+    float shade = step(0.1, intensity) * 0.3 + 
+                  step(0.3, intensity) * 0.4 +
+                  step(0.6, intensity) * 0.3;
+
+    // Sample texture and apply shading
+    vec4 tex_color = texture(albedo_texture, UV);
+    vec3 final_color = tex_color.rgb * shade * light_color;
+
+    ALBEDO = final_color;
+}

shaders/test.gdshader

@@ -0,0 +1,36 @@
+shader_type spatial;
+render_mode unshaded;
+
+uniform vec4 light_color : source_color = vec4(1.0, 1.0, 1.0, 1.0);
+uniform sampler2D albedo_texture;
+uniform float outline_width = 0.05; // Thickness of outline
+uniform vec4 outline_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
+
+void vertex() {
+    // Expanding vertices along normals for outlines (inverted hull technique)
+    if (OUTLINE_PASS) {
+        VERTEX += NORMAL * outline_width;
+    }
+}
+
+void fragment() {
+    vec3 light_dir = normalize(vec3(0.5, 1.0, -0.5)); // Fake directional light
+    vec3 norm = normalize(NORMAL);
+    float intensity = dot(norm, light_dir);
+
+    // Cel shading (quantized lighting levels)
+    float shade = smoothstep(0.1, 0.3, intensity) * 0.5 +
+                  smoothstep(0.3, 0.6, intensity) * 0.3 +
+                  smoothstep(0.6, 1.0, intensity) * 0.2;
+
+    // Sample texture and apply shading
+    vec4 tex_color = texture(albedo_texture, UV);
+    vec3 final_color = tex_color.rgb * shade * light_color.rgb;
+
+    // Outline pass
+    if (OUTLINE_PASS) {
+        final_color = outline_color.rgb;
+    }
+
+    ALBEDO = final_color;
+}