From 7ed81040eda72f96d9ce34fcf04427b40d88f6fe Mon Sep 17 00:00:00 2001
From: emil28092005 <emil28092005@users.noreply.github.com>
Date: Thu, 18 Jun 2026 19:47:29 +0300
Subject: [PATCH] =?UTF-8?q?debug:=20simple=20diffuse=20point=20light=20?=
 =?UTF-8?q?=E2=80=94=20test=20if=20light=20data=20reaches=20fragment?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../Shaders/triangle.frag                      |  15 +++++++++++++--
 .../Shaders/triangle.frag.spv                  | Bin 928 -> 2220 bytes
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
index 1cb8f53..82d0e14 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
@@ -14,6 +14,17 @@ layout(set = 0, binding = 0) uniform CameraUBO {
 
 void main()
 {
-    // Just output albedo — tests if vp matrix in 128B UBO works
-    outColor = vec4(fragAlbedo, 1.0);
+    vec3 N = normalize(fragNormal);
+    vec3 toLight = pointLightPos.xyz - fragWorldPos;
+    float dist = length(toLight);
+    vec3 L = normalize(toLight);
+
+    float NdotL = max(dot(N, L), 0.0);
+    float atten = 1.0 / (1.0 + dist * dist * 0.05);
+    float intensity = pointLightPos.w;
+
+    vec3 color = fragAlbedo * pointLightColor.xyz * NdotL * intensity * atten;
+    color += fragAlbedo * 0.02;
+
+    outColor = vec4(color, 1.0);
 }
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv
index aaa49571c4ede38911f8c3a270c02fcebc2febc1..1babfe73ee4ea7e302bc39512829f35109b5ea27 100644
GIT binary patch
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