From 629dc808c595d65cda74a86975ebd780113f3431 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sun, 9 Feb 2025 18:50:58 +1100
Subject: Properly send lights from the CPU

---
 intermediate/scene.glb    | Bin 0 -> 12360 bytes
 intermediate/surface.glsl |  59 +++++++++++++++++++++++++++++++++-------------
 2 files changed, 42 insertions(+), 17 deletions(-)
 create mode 100644 intermediate/scene.glb

(limited to 'intermediate')

diff --git a/intermediate/scene.glb b/intermediate/scene.glb
new file mode 100644
index 0000000..5335c55
Binary files /dev/null and b/intermediate/scene.glb differ
diff --git a/intermediate/surface.glsl b/intermediate/surface.glsl
index 0cba7f8..fff15ed 100644
--- a/intermediate/surface.glsl
+++ b/intermediate/surface.glsl
@@ -54,9 +54,24 @@ type: float
 name: ao
 type: float
 [variable]
+name: light_count
+type: int
+[variable]
 name: camera_pos
 type: vec3
 
+[struct]
+name: Light
+[variable]
+name: dir
+type: vec3
+[variable]
+name: brightness
+type: float
+[variable]
+name: colour
+type: vec3
+
 [cbuffer]
 name: c_mvp
 type: MVP
@@ -67,6 +82,11 @@ name: material
 type: Material
 stage: fragment
 
+[sbuffer]
+name: lights
+type: Light
+stage: fragment
+
 [texture]
 name: albedo
 stage: fragment
@@ -147,6 +167,7 @@ float specular_brdf(vec2 uv, vec3 ref, vec3 l, vec3 v, vec3 n) {
 }
 
 void main() {
+	int i;
 	vec2 uv = interpolator.uv;
 	vec3 p = interpolator.position.xyz;
 
@@ -158,29 +179,33 @@ void main() {
 	else
 		nrm = normalize(interpolator.tbn * nrm);
 
-	vec3 light_dir = vec3(0, 0, 1);
 	vec3 col = texture(albedo, uv).rgb * material.albedo;
-	float cos_theta_i = max(dot(nrm, light_dir), 0.0);
 	vec3 view_dir = normalize(material.camera_pos - p);
 	float met = texture(metal, uv).r * material.metalness;
-
 	vec3 ref = reflect(-view_dir, nrm);
-	vec3 spec_col = texture(env_cube, ref, material.roughness * 8.0).rgb;
-	vec3 amb_col = textureLod(env_cube, nrm, 8.0).rgb;
-
-	vec3 diffuse =
-		diffuse_brdf(uv) *
-		(1.0 - met) *
-		cos_theta_i;
-	vec3 spec =
-		mix(spec_col, spec_col * col, met) *
-		specular_brdf(uv, ref, light_dir, view_dir, nrm) *
-		cos_theta_i;
+	vec3 ref_col = texture(env_cube, ref, material.roughness * 8.0).rgb;
+	vec3 spec_col = mix(ref_col, ref_col * col, met);
+	vec3 amb_col = min(textureLod(env_cube, nrm, 8.0).rgb, 0.05);
 	vec3 ambient =
-		min(amb_col, 0.05) *
+		amb_col *
 		texture(ao, uv).r * material.ao;
-
-	colour = vec4(ambient + diffuse + spec, 1.0);
+	
+	vec3 base_diffuse = diffuse_brdf(uv) * (1.0 - met);
+
+	vec3 light = 0.0.xxx;
+	for (i = 0; i < material.light_count; i++) {
+		Light l = lights[i];
+		vec3 light_dir = l.dir;
+		float cos_theta_i = max(dot(nrm, light_dir), 0.0);
+		vec3 diffuse = base_diffuse * cos_theta_i;
+		vec3 spec =
+			spec_col *
+			specular_brdf(uv, ref, light_dir, view_dir, nrm) *
+			cos_theta_i;
+		light += (diffuse + spec) * l.brightness;
+	}
+
+	colour = vec4(ambient + light, 1.0);
 }
 
 #endif
-- 
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