1 files changed, 67 insertions, 0 deletions
diff --git a/assets/shaders/Sphere.slang b/assets/shaders/Sphere.slang
new file mode 100644
index 0000000..0871438
--- /dev/null
+++ b/assets/shaders/Sphere.slang
@@ -0,0 +1,67 @@
+uniform float4x4 u_ViewProjection;
+uniform float4x4 u_Transform;
+
+struct VSInput
+{
+    float3 position : POSITION;
+    float3 normal   : NORMAL;
+};
+
+struct VSOutput
+{
+    float4 position : SV_Position;
+    float3 normal   : TEXCOORD0;
+    float3 worldPos : TEXCOORD1;
+};
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.worldPos = mul(u_Transform, float4(input.position, 1.0)).xyz;
+    float3x3 normalMatrix = (float3x3)u_Transform;
+    output.normal   = mul(normalMatrix, input.normal);
+    output.position = mul(u_ViewProjection, float4(output.worldPos, 1.0));
+    return output;
+}
+
+uniform float3 u_Color;
+uniform float  u_Specular;
+uniform float  u_Emission;
+uniform float3 u_LightPos;
+uniform float3 u_CameraPos;
+uniform int    u_IsSelected;
+uniform float3 u_OutlineColor;
+uniform float  u_OutlineWidth;
+SamplerCube    u_HDRIEnvironment;
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input) : SV_Target
+{
+    float3 normal     = normalize(input.normal);
+    float3 lightDir   = normalize(u_LightPos - input.worldPos);
+    float3 viewDir    = normalize(u_CameraPos - input.worldPos);
+    float3 reflectDir = reflect(-lightDir, normal);
+
+    float3 hdriLight     = u_HDRIEnvironment.Sample(normal).rgb;
+    float  hdriIntensity = 0.3;
+
+    float diff = max(dot(normal, lightDir), 0.0);
+    float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32.0);
+
+    float3 diffuse  = u_Color * (diff + hdriIntensity * hdriLight);
+    float3 specular = float3(u_Specular, u_Specular, u_Specular) * spec;
+    float3 emission = u_Color * u_Emission;
+
+    float3 result = diffuse + specular + emission;
+
+    if (u_IsSelected > 0)
+    {
+        float ndotv       = max(dot(normal, viewDir), 0.0);
+        float rim         = 1.0 - ndotv;
+        float outlineMask = step(1.0 - u_OutlineWidth, rim);
+        result = lerp(result, u_OutlineColor, outlineMask);
+    }
+
+    return float4(result, 1.0);
+}