point light

1 files changed, 18 insertions, 3 deletions

diff --git a/intermediate/surface.glsl b/intermediate/surface.glsl
index 71a4307..79f5f65 100644
--- a/intermediate/surface.glsl
+++ b/intermediate/surface.glsl
@@ -244,8 +244,23 @@ void main() {
 	vec3 light = 0.0.xxx;
 	for (i = 0; i < globals.light_count; i++) {
 		Light l = lights[i];
-		vec3 light_dir = l.dir;
-		float cos_theta_i = max(dot(nrm, light_dir), 0.0);
+		vec3 light_dir;
+		float cos_theta_i, atten;
+		switch (l.type) {
+			case LT_SUN:
+				light_dir = l.pos;
+				cos_theta_i = max(dot(nrm, light_dir), 0.0);
+				atten = 1.0;
+				break;
+			case LT_POINT: {
+				float d;
+				light_dir = p - l.pos;
+				d = length(light_dir);
+				atten = max(d, 0.01);
+				atten = 1.0 / (atten * atten);
+				light_dir /= d;
+			} break;
+		}
 		vec3 diffuse = base_diffuse * cos_theta_i;
 		vec3 spec =
 			spec_col *
@@ -254,7 +269,7 @@ void main() {
 		float shadow = 1.0f;
 		if (l.caster_id >= 0)
 			shadow = get_shadow(l, p);
-		light += (diffuse + spec) * l.brightness * l.colour * shadow;
+		light += (diffuse + spec) * atten * l.brightness * l.colour * shadow;
 	}
 
 	colour = vec4(ambient + light, 1.0);