New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/shaders/Metal/system.metal

@@ -0,0 +1,58 @@
+#include <metal_stdlib>
+#include <simd/simd.h>
+using namespace metal;
+
+typedef struct
+{
+  float2 a_position [[attribute(0)]];
+} Vertex_T;
+
+typedef struct
+{
+  float4 position [[position]];
+} Fragment_T;
+
+typedef struct
+{
+  float4 u_color;
+} Uniforms_T;
+
+typedef struct
+{
+  float4 color [[color(0)]];
+  float depth [[depth(any)]];
+} Fragment_Output;
+
+typedef struct
+{
+  float depth [[depth(any)]];
+} Fragment_DepthOutput;
+
+vertex Fragment_T vsCleaner(const Vertex_T in [[stage_in]])
+{
+  Fragment_T out;
+  out.position = float4(in.a_position, 0.0, 1.0);
+  return out;
+}
+
+fragment float4 fsClearColor(const Fragment_T in [[stage_in]],
+                             constant Uniforms_T & uniforms [[buffer(0)]])
+{
+  return uniforms.u_color;
+}
+
+fragment Fragment_DepthOutput fsClearDepth(const Fragment_T in [[stage_in]])
+{
+  Fragment_DepthOutput out;
+  out.depth = 1.0;
+  return out;
+}
+
+fragment Fragment_Output fsClearColorAndDepth(const Fragment_T in [[stage_in]],
+                                              constant Uniforms_T & uniforms [[buffer(0)]])
+{
+  Fragment_Output out;
+  out.color = uniforms.u_color;
+  out.depth = 1.0;
+  return out;
+}