[feat]: complete RHI api

1 files changed, 29 insertions, 0 deletions

diff --git a/assets/shaders/skybox.slang b/assets/shaders/skybox.slang
new file mode 100644
index 0000000..6447bea
--- /dev/null
+++ b/assets/shaders/skybox.slang
@@ -0,0 +1,29 @@
+// Fullscreen skybox cube. View/projection in a ConstantBuffer (UBO, binding 0)
+// so both backends drive it through the RHI; the cubemap is a sampler at binding 1.
+struct SkyboxU
+{
+    float4x4 u_Projection;
+    float4x4 u_View;
+};
+ConstantBuffer<SkyboxU> sb;
+
+struct VSInput  { float3 position : POSITION; };
+struct VSOutput { float4 position : SV_Position; float3 texCoords : TEXCOORD0; };
+
+[shader("vertex")]
+VSOutput vertexMain(VSInput input)
+{
+    VSOutput output;
+    output.texCoords = input.position;
+    float4 pos = mul(sb.u_Projection, mul(sb.u_View, float4(input.position, 1.0)));
+    output.position = pos.xyww;   // force depth = 1 so the skybox stays behind everything
+    return output;
+}
+
+SamplerCube u_Skybox;
+
+[shader("fragment")]
+float4 fragmentMain(VSOutput input) : SV_Target
+{
+    return u_Skybox.Sample(input.texCoords);
+}