From 4b259648a16191d61133218f20907956f1e9f4db Mon Sep 17 00:00:00 2001
From: Peter Li <peterino>
Date: Wed, 7 May 2025 16:01:12 -0700
Subject: [PATCH] fixed normal rotations

---
 engine/rend/shaders/meshes.vert.hlsl          |  26 +++++++++++++++++-
 engine/rend/shaders/meshes.vert.json          |  12 ++++----
 engine/rend/shaders/postProc.frag.hlsl        |   2 ++
 .../content/_shaders/dxil/meshes.vert.dxil    | Bin 6408 -> 6796 bytes
 projects/content/_shaders/msl/meshes.vert.msl |  12 ++++----
 projects/content/_shaders/spv/meshes.vert.spv | Bin 2332 -> 3280 bytes
 6 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/engine/rend/shaders/meshes.vert.hlsl b/engine/rend/shaders/meshes.vert.hlsl
index 8e86d2c..1aff330 100644
--- a/engine/rend/shaders/meshes.vert.hlsl
+++ b/engine/rend/shaders/meshes.vert.hlsl
@@ -44,6 +44,28 @@ cbuffer Uniforms : register(b0, space1)
     float time;
 };
 
+float4x4 ExtractRotation(float4x4 m)
+{
+    // Extract basis vectors
+    float3 x = float3(m._11, m._12, m._13);
+    float3 y = float3(m._21, m._22, m._23);
+    float3 z = float3(m._31, m._32, m._33);
+
+    // Remove scale by normalizing each axis
+    x = normalize(x);
+    y = normalize(y);
+    z = normalize(z);
+
+    // Reconstruct rotation matrix
+    float3x3 m2 = float3x3(x, y, z);
+
+    return float4x4(
+        float4(m2[0][0], m2[0][1], m2[0][2], 0.0),
+        float4(m2[1][0], m2[1][1], m2[1][2], 0.0),
+        float4(m2[2][0], m2[2][1], m2[2][2], 0.0),
+        float4(0.0,     0.0,     0.0,     1.0)
+    );}
+
 Output main(Input input)
 {
     Output output;
@@ -57,8 +79,10 @@ Output main(Input input)
     float4 WorldPos = mul(scene[input.Instance].Model, pos);
     output.Position = mul(ViewProjection, mul(scene[input.Instance].Model, pos));
     output.WorldPos = WorldPos.xyz;
+    
+    float4x4 noTranslate = ExtractRotation(scene[input.Instance].Model);
     // output.Normal = mul(scene[input.Instance].Model, float4(input.Normal, 1.0)).xyz;
-    output.Normal = input.Normal;
+    output.Normal = mul(noTranslate, input.Normal);
     output.DirectionalShadowFragPos = mul(ShadowMapProjection, WorldPos);
     output.Instance = input.Instance;
 
diff --git a/engine/rend/shaders/meshes.vert.json b/engine/rend/shaders/meshes.vert.json
index 78f7a09..ab8acfa 100644
--- a/engine/rend/shaders/meshes.vert.json
+++ b/engine/rend/shaders/meshes.vert.json
@@ -6,7 +6,7 @@
         }
     ],
     "types" : {
-        "_13" : {
+        "_14" : {
             "name" : "Scene",
             "members" : [
                 {
@@ -38,12 +38,12 @@
                 }
             ]
         },
-        "_12" : {
+        "_13" : {
             "name" : "type.StructuredBuffer.Scene",
             "members" : [
                 {
                     "name" : "_m0",
-                    "type" : "_13",
+                    "type" : "_14",
                     "array" : [
                         0
                     ],
@@ -55,7 +55,7 @@
                 }
             ]
         },
-        "_15" : {
+        "_16" : {
             "name" : "type.Uniforms",
             "members" : [
                 {
@@ -126,7 +126,7 @@
     ],
     "ssbos" : [
         {
-            "type" : "_12",
+            "type" : "_13",
             "name" : "scene",
             "readonly" : true,
             "block_size" : 0,
@@ -136,7 +136,7 @@
     ],
     "ubos" : [
         {
-            "type" : "_15",
+            "type" : "_16",
             "name" : "type.Uniforms",
             "block_size" : 132,
             "set" : 1,
diff --git a/engine/rend/shaders/postProc.frag.hlsl b/engine/rend/shaders/postProc.frag.hlsl
index 0f6fb0b..ddc5c71 100644
--- a/engine/rend/shaders/postProc.frag.hlsl
+++ b/engine/rend/shaders/postProc.frag.hlsl
@@ -90,6 +90,8 @@ float4 main(float2 UV : TEXCOORD0) : SV_Target0
     float exposure = 1.0;
     c *= exposure;//= exposure(c, 1.0, 0.3);
 
+    // c = c * c ;
+
     // c = e;
 
     // c = float3(uv.x, uv.y, 0.0);
diff --git a/projects/content/_shaders/dxil/meshes.vert.dxil b/projects/content/_shaders/dxil/meshes.vert.dxil
index 3e1902c54dccac8ee0029988a0370893601452d8..5b76d0bed35923c4fd96ff856e24483f41527157 100644
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diff --git a/projects/content/_shaders/msl/meshes.vert.msl b/projects/content/_shaders/msl/meshes.vert.msl
index f98d6ae..55d2e3c 100644
--- a/projects/content/_shaders/msl/meshes.vert.msl
+++ b/projects/content/_shaders/msl/meshes.vert.msl
@@ -44,14 +44,14 @@ struct main0_in
 vertex main0_out main0(main0_in in [[stage_in]], constant type_Uniforms& Uniforms [[buffer(0)]], const device type_StructuredBuffer_Scene& scene [[buffer(1)]], uint gl_InstanceIndex [[instance_id]])
 {
     main0_out out = {};
-    float4 _48 = float4(in.in_var_TEXCOORD0, 1.0);
-    float4 _51 = scene._m0[gl_InstanceIndex].Model * _48;
+    float4 _52 = float4(in.in_var_TEXCOORD0, 1.0);
+    float4 _55 = scene._m0[gl_InstanceIndex].Model * _52;
     out.out_var_TEXCOORD0 = in.in_var_TEXCOORD3;
-    out.out_var_TEXCOORD1 = _51.xyz;
-    out.out_var_TEXCOORD2 = in.in_var_TEXCOORD1;
-    out.out_var_TEXCOORD3 = Uniforms.ShadowMapProjection * _51;
+    out.out_var_TEXCOORD1 = _55.xyz;
+    out.out_var_TEXCOORD2 = float3((in.in_var_TEXCOORD1 * float4x3(float4(fast::normalize(float3(scene._m0[gl_InstanceIndex].Model[0][0], scene._m0[gl_InstanceIndex].Model[1][0], scene._m0[gl_InstanceIndex].Model[2][0])), 0.0).xyz, float4(fast::normalize(float3(scene._m0[gl_InstanceIndex].Model[0][1], scene._m0[gl_InstanceIndex].Model[1][1], scene._m0[gl_InstanceIndex].Model[2][1])), 0.0).xyz, float4(fast::normalize(float3(scene._m0[gl_InstanceIndex].Model[0][2], scene._m0[gl_InstanceIndex].Model[1][2], scene._m0[gl_InstanceIndex].Model[2][2])), 0.0).xyz, float3(0.0))).xyz);
+    out.out_var_TEXCOORD3 = Uniforms.ShadowMapProjection * _55;
     out.out_var_TEXCOORD4 = gl_InstanceIndex;
-    out.gl_Position = Uniforms.ViewProjection * (scene._m0[gl_InstanceIndex].Model * _48);
+    out.gl_Position = Uniforms.ViewProjection * (scene._m0[gl_InstanceIndex].Model * _52);
     return out;
 }
 
diff --git a/projects/content/_shaders/spv/meshes.vert.spv b/projects/content/_shaders/spv/meshes.vert.spv
index 954489e4a3d7042f5d11273a0c131d20dbe7a300..98482024cf0a512727e3087f8c44b17706c06540 100644
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