From e36cbc7774e7694840b7a9453ffe194fa270c416 Mon Sep 17 00:00:00 2001
From: emil28092005 <emil28092005@users.noreply.github.com>
Date: Thu, 18 Jun 2026 17:03:15 +0300
Subject: [PATCH] =?UTF-8?q?feat:=20diffuse=20lighting=20=E2=80=94=20normal?=
 =?UTF-8?q?s=20passed=20to=20fragment=20shader?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

- Vertex shader: pass normal through mat3(model) to fragment
- Fragment shader: directional light (0.5, 0.8, 0.3) with 0.25 ambient
  + 0.75 diffuse = faces now have depth and 3D form
- Torus knot has smooth normals (vn in OBJ), cubes have face normals
- 0 validation errors, ~2300 FPS
---
 .../Shaders/triangle.frag                     |   8 +++++++-
 .../Shaders/triangle.frag.spv                 | Bin 500 -> 1148 bytes
 .../Shaders/triangle.vert                     |   2 ++
 .../Shaders/triangle.vert.spv                 | Bin 1544 -> 1880 bytes
 4 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
index 7122ce8..8d5bf0d 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
@@ -1,8 +1,14 @@
 #version 450
 
 layout(location = 0) in vec3 fragColor;
+layout(location = 1) in vec3 fragNormal;
 layout(location = 0) out vec4 outColor;
 
 void main() {
-    outColor = vec4(fragColor, 1.0);
+    vec3 N = normalize(fragNormal);
+    vec3 L = normalize(vec3(0.5, 0.8, 0.3));
+    float diff = max(dot(N, L), 0.0);
+    float ambient = 0.25;
+    vec3 color = fragColor * (ambient + diff * 0.75);
+    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 828f1e56b1fa987e9bc5cdb272d43039ab4f4c08..cb92ce1a6be7802c4e5d26af453fd45d4a691548 100644
GIT binary patch
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literal 500
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D$)gy>

diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
index 8cfb483..736c74d 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
@@ -5,6 +5,7 @@ layout(location = 1) in vec3 inColor;
 layout(location = 2) in vec3 inNormal;
 
 layout(location = 0) out vec3 fragColor;
+layout(location = 1) out vec3 fragNormal;
 
 layout(set = 0, binding = 0) uniform CameraUBO {
     mat4 vp;
@@ -17,4 +18,5 @@ layout(push_constant) uniform PC {
 void main() {
     gl_Position = vp * pc.model * vec4(inPosition, 1.0);
     fragColor = inColor;
+    fragNormal = mat3(pc.model) * inNormal;
 }
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert.spv
index 7107a91cdfce10518468e6a18b36ad69da9120b0..834e27ad574172770979739a41d481cb3db94d5d 100644
GIT binary patch
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delta 60
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