debug: simple diffuse fragment shader to test point light UBO

src/Engine.Graphics.Vulkan/Shaders/triangle.frag

@@ -8,108 +8,22 @@ layout(location = 0) out vec4 outColor;
 
 layout(set = 0, binding = 0) uniform CameraUBO {
     mat4 vp;
-    vec4 pointLightPos;     // xyz = position, w = intensity
-    vec4 pointLightColor;   // xyz = color, w = range
+    vec4 pointLightPos;
+    vec4 pointLightColor;
 };
 
-const vec3 AMBIENT = vec3(0.01, 0.01, 0.02);
-
-const float PI = 3.14159265359;
-
-float distributionGGX(vec3 N, vec3 H, float roughness)
-{
-    float a = roughness * roughness;
-    float a2 = a * a;
-    float NdotH = max(dot(N, H), 0.0);
-    float NdotH2 = NdotH * NdotH;
-    float num = a2;
-    float denom = NdotH2 * (a2 - 1.0) + 1.0;
-    denom = PI * denom * denom;
-    return num / denom;
-}
-
-float geometrySchlickGGX(float NdotV, float roughness)
-{
-    float r = roughness + 1.0;
-    float k = (r * r) / 8.0;
-    return NdotV / (NdotV * (1.0 - k) + k);
-}
-
-float geometrySmith(vec3 N, vec3 V, vec3 L, float roughness)
-{
-    float NdotV = max(dot(N, V), 0.0);
-    float NdotL = max(dot(N, L), 0.0);
-    return geometrySchlickGGX(NdotV, roughness) * geometrySchlickGGX(NdotL, roughness);
-}
-
-vec3 fresnelSchlick(float cosTheta, vec3 F0)
-{
-    return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
-}
-
-vec3 acesTonemap(vec3 color)
-{
-    float a = 2.51;
-    float b = 0.03;
-    float c = 2.43;
-    float d = 0.59;
-    float e = 0.14;
-    return clamp((color * (a * color + b)) / (color * (c * color + d) + e), 0.0, 1.0);
-}
-
-vec3 calcLight(vec3 N, vec3 V, vec3 L, vec3 radiance, vec3 albedo, float roughness, float metallic)
-{
-    vec3 H = normalize(V + L);
-    vec3 F0 = mix(vec3(0.04), albedo, metallic);
-
-    float NDF = distributionGGX(N, H, roughness);
-    float G = geometrySmith(N, V, L, roughness);
-    vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
-
-    vec3 numerator = NDF * G * F;
-    float denominator = 4.0 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.0001;
-    vec3 specular = numerator / denominator;
-
-    vec3 kS = F;
-    vec3 kD = (vec3(1.0) - kS) * (1.0 - metallic);
-
-    float NdotL = max(dot(N, L), 0.0);
-    return (kD * albedo / PI + specular) * radiance * NdotL;
-}
-
 void main()
 {
     vec3 N = normalize(fragNormal);
-    vec3 V = normalize(-fragWorldPos);
-
-    vec3 albedo = fragAlbedo;
-    float roughness = 0.5;
-    float metallic = 0.1;
-
-    // Only point light — no directional, near-zero ambient
-    vec3 color = AMBIENT * albedo;
-
-    vec3 lightPos = pointLightPos.xyz;
-    float lightIntensity = pointLightPos.w;
-    vec3 lightColor = pointLightColor.xyz;
-    float lightRange = pointLightColor.w;
-
-    vec3 toLight = lightPos - fragWorldPos;
+    vec3 toLight = pointLightPos.xyz - fragWorldPos;
     float dist = length(toLight);
-    vec3 L = toLight / max(dist, 0.001);
+    vec3 L = normalize(toLight);
 
-    // Unity-style attenuation
-    float attenuation = pow(clamp(1.0 - dist / lightRange, 0.0, 1.0), 2.0);
-    vec3 radiance = lightColor * lightIntensity * attenuation;
+    float NdotL = max(dot(N, L), 0.0);
+    float atten = 1.0 / (1.0 + dist * dist * 0.1);
+    float intensity = pointLightPos.w;
 
-    if (lightIntensity > 0.0 && lightRange > 0.0)
-    {
-        color += calcLight(N, V, L, radiance, albedo, roughness, metallic);
-    }
-
-    // Tonemap + gamma
-    color = acesTonemap(color);
-    color = pow(color, vec3(1.0 / 2.2));
+    vec3 color = fragAlbedo * pointLightColor.xyz * NdotL * intensity * atten;
 
     outColor = vec4(color, 1.0);
 }

src/Engine.Graphics.Vulkan/VulkanRenderer.cs

@@ -86,6 +86,7 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
             {
                 lightPos = new Vector4(lt.Position, l.Intensity);
                 lightColor = new Vector4(l.Color, l.Range);
+                Console.WriteLine($"[Vulkan] Point light: pos={lt.Position}, intensity={l.Intensity}, range={l.Range}, color={l.Color}");
             }
         });
         if (lightPos.W == 0)
@@ -96,9 +97,14 @@ internal sealed unsafe class VulkanRenderer : IRenderer, Engine.Graphics.IScreen
                 {
                     lightPos = new Vector4(l.Position, l.Intensity);
                     lightColor = new Vector4(l.Color, l.Range);
+                    Console.WriteLine($"[Vulkan] Point light (fallback): pos={l.Position}, intensity={l.Intensity}");
                 }
             });
         }
+        if (lightPos.W == 0)
+        {
+            Console.WriteLine("[Vulkan] WARNING: No point light found in ECS!");
+        }
 
         // Pack UBO: mat4 vp (64 bytes) + vec4 lightPos (16) + vec4 lightColor (16) = 96 bytes
         var uboData = stackalloc byte[128];