Vendor dependencies for 0.3.0 release

vendor/objc2-metal/examples/triangle.metal

@@ -0,0 +1,38 @@
+#include <metal_stdlib>
+
+struct SceneProperties {
+    float time;
+};
+
+struct VertexInput {
+    metal::packed_float3 position;
+    metal::packed_float3 color;
+};
+
+struct VertexOutput {
+    metal::float4 position [[position]];
+    metal::float4 color;
+};
+
+vertex VertexOutput vertex_main(
+    device const SceneProperties& properties [[buffer(0)]],
+    device const VertexInput* vertices [[buffer(1)]],
+    uint vertex_idx [[vertex_id]]
+) {
+    VertexOutput out;
+    VertexInput in = vertices[vertex_idx];
+    out.position =
+        metal::float4(
+            metal::float2x2(
+                metal::cos(properties.time), -metal::sin(properties.time),
+                metal::sin(properties.time),  metal::cos(properties.time)
+            ) * in.position.xy,
+            in.position.z,
+            1);
+    out.color = metal::float4(in.color, 1);
+    return out;
+}
+
+fragment metal::float4 fragment_main(VertexOutput in [[stage_in]]) {
+    return in.color;
+}