Adjust backpack framing and remove lighting

tests/RHI/integration/backpack/main.cpp

@@ -200,7 +200,7 @@ SceneConstants CreateSceneConstants(const Mesh& mesh) {
     const Matrix4x4 scale =
         Matrix4x4::Scale(Vector3(uniformScale, uniformScale, uniformScale));
     const Matrix4x4 world =
-        Matrix4x4::Translation(Vector3(0.0f, -0.25f, 3.0f)) *
+        Matrix4x4::Translation(Vector3(0.0f, 0.08f, 3.0f)) *
         rotation *
         scale *
         centerTranslation;
@@ -304,19 +304,8 @@ PSInput MainVS(VSInput input) {
 }
 
 float4 MainPS(PSInput input, bool isFrontFace : SV_IsFrontFace) : SV_TARGET {
-    float3 normal = normalize(isFrontFace ? input.worldNormal : -input.worldNormal);
-    float3 lightDir = normalize(gLightDirection.xyz);
-    float3 viewDir = normalize(gCameraPosition.xyz - input.worldPosition);
-    float3 halfDir = normalize(lightDir + viewDir);
-
     float3 baseColor = gBaseColorTexture.Sample(gBaseColorSampler, input.texcoord).rgb;
-    float specularMask = gSpecularTexture.Sample(gSpecularSampler, input.texcoord).r;
-    float diffuse = saturate(dot(normal, lightDir));
-    float specular = pow(saturate(dot(normal, halfDir)), 32.0f) * specularMask;
-
-    float3 color = baseColor * (gAmbientColor.rgb + gLightColor.rgb * diffuse);
-    color += gLightColor.rgb * (specular * 0.35f);
-    return float4(saturate(color), 1.0f);
+    return float4(baseColor, 1.0f);
 }
 )";
 
@@ -370,19 +359,8 @@ in vec2 vTexCoord;
 layout(location = 0) out vec4 fragColor;
 
 void main() {
-    vec3 normal = normalize(gl_FrontFacing ? vWorldNormal : -vWorldNormal);
-    vec3 lightDir = normalize(gLightDirection.xyz);
-    vec3 viewDir = normalize(gCameraPosition.xyz - vWorldPosition);
-    vec3 halfDir = normalize(lightDir + viewDir);
-
     vec3 baseColor = texture(uBaseColorTexture, vTexCoord).rgb;
-    float specularMask = texture(uSpecularTexture, vTexCoord).r;
-    float diffuse = max(dot(normal, lightDir), 0.0);
-    float specular = pow(max(dot(normal, halfDir), 0.0), 32.0) * specularMask;
-
-    vec3 color = baseColor * (gAmbientColor.rgb + gLightColor.rgb * diffuse);
-    color += gLightColor.rgb * (specular * 0.35);
-    fragColor = vec4(clamp(color, 0.0, 1.0), 1.0);
+    fragColor = vec4(baseColor, 1.0);
 }
 )";