Add Vulkan Host-Shader compilation

Compiles Vulkan Host shaders into spirv binary files and embeds them
into the application's virtual file-system.

src/host_shaders/vulkan_display.frag

@@ -0,0 +1,7 @@
+#version 460 core
+layout(location = 0) in vec2 UV;
+layout(location = 0) out vec4 FragColor;
+
+layout(binding = 0) uniform sampler2D u_texture;
+
+void main() { FragColor = texture(u_texture, UV); }

src/host_shaders/vulkan_display.vert

@@ -0,0 +1,23 @@
+#version 460 core
+layout(location = 0) out vec2 UV;
+
+void main() {
+	const vec4 positions[4] = vec4[](
+		vec4(-1.0, 1.0, 1.0, 1.0),   // Top-left
+		vec4(1.0, 1.0, 1.0, 1.0),    // Top-right
+		vec4(-1.0, -1.0, 1.0, 1.0),  // Bottom-left
+		vec4(1.0, -1.0, 1.0, 1.0)    // Bottom-right
+	);
+
+	// The 3DS displays both screens' framebuffer rotated 90 deg counter clockwise
+	// So we adjust our texcoords accordingly
+	const vec2 texcoords[4] = vec2[](
+		vec2(1.0, 1.0),  // Top-right
+		vec2(1.0, 0.0),  // Bottom-right
+		vec2(0.0, 1.0),  // Top-left
+		vec2(0.0, 0.0)   // Bottom-left
+	);
+
+	gl_Position = positions[gl_VertexIndex];
+	UV = texcoords[gl_VertexIndex];
+}