From d6ca80c67831b97a2ebc9d437cfee91c7c247371 Mon Sep 17 00:00:00 2001
From: emil28092005 <emil28092005@users.noreply.github.com>
Date: Thu, 18 Jun 2026 12:39:51 +0300
Subject: [PATCH] fix: add normal-based diffuse lighting so cube is visible as
 3D

- Fragment shader: directional light dot(normal, lightDir) with 0.2 ambient
- Vertex shader: pass normal through mat3(model) to fragment
- Same-color faces now have different shading based on orientation
---
 .../Shaders/triangle.frag                     |   5 ++++-
 .../Shaders/triangle.frag.spv                 | Bin 500 -> 908 bytes
 .../Shaders/triangle.vert                     |   2 ++
 .../Shaders/triangle.vert.spv                 | Bin 1544 -> 1880 bytes
 4 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
index 7122ce8..b0205a1 100644
--- a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
+++ b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag
@@ -1,8 +1,11 @@
 #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 lightDir = normalize(vec3(0.5, 0.8, 0.3));
+    float diff = max(dot(normalize(fragNormal), lightDir), 0.2);
+    outColor = vec4(fragColor * diff, 1.0);
 }
diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv b/src/Engine.Graphics.Vulkan/Shaders/triangle.frag.spv
index 828f1e56b1fa987e9bc5cdb272d43039ab4f4c08..4a5184bc719093628c3e3d83731db0076a082173 100644
GIT binary patch
literal 908
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literal 500
zcmYk1y-EX75JtzWn?w`yV?aBJSO$WH20_%qB29_}pCBNLpf1Fu&$IbdHiG9|cg2O-
zxpVF}^Ucj_XN`!RXhkyy@%#0o1_@X_<>~BUHvU*YjxR3HRdgatLN(oJ#4g!*TfV$|
zu}8Ft9y&P&oHC|HeA1Ld|Lb#zJ;i2yU%VD8j*vXfcv>x=D>$V~-H8G|YkjJEfP)^V
z$t}|Ph;tn_B#zO$i?#kk{!Oy4kzbd!9y0a&WcAkSTV$S)xO!`Mkd3I-c8G}W-Gn!|
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D$)gy>

diff --git a/src/Engine.Graphics.Vulkan/Shaders/triangle.vert b/src/Engine.Graphics.Vulkan/Shaders/triangle.vert
index d587a87..9b81756 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(row_major, set = 0, binding = 0) uniform CameraUBO {
     mat4 vp;
@@ -17,4 +18,5 @@ layout(row_major, 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 edfeddb33d4d1e99fac4fcba0ca89073fe8ad874..b9f3c50d5f35dfe6c62faf446604e4d07c99808d 100644
GIT binary patch
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delta 60
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