Vendor dependencies for 0.3.0 release

vendor/metal/examples/circle/shaders.metal

@@ -0,0 +1,39 @@
+#include <metal_stdlib>
+
+#include <simd/simd.h>
+
+using namespace metal;
+
+typedef struct {
+  float x;
+  float y;
+}position;
+
+typedef struct {
+  float r;
+  float g;
+  float b;
+}color;
+
+typedef struct {
+  position p;
+  color c;
+}AAPLVertex;
+
+struct ColorInOut {
+  float4 position[[position]];
+  float4 color;
+};
+
+vertex ColorInOut vs(constant AAPLVertex * vertex_array[[buffer(0)]], unsigned int vid[[vertex_id]]) {
+  ColorInOut out;
+
+  out.position = float4(float2(vertex_array[vid].p.x, vertex_array[vid].p.y), 0.0, 1.0);
+  out.color = float4(float3(vertex_array[vid].c.r, vertex_array[vid].c.g, vertex_array[vid].c.b), 1.0);
+
+  return out;
+}
+
+fragment float4 ps(ColorInOut in [[stage_in]]) {
+  return in.color;
+}