Vulkan: scene rendering (D1–D7) on a scene walk shared with GL (N6a, N6b)

shaders/vk14/pick_surface.frag

@@ -0,0 +1,11 @@
+#version 460 core
+#define STAGE_FRAGMENT 1
+#include "common.glsl"
+
+layout(location = 0) out vec4 out_color;
+layout(location = 2) in vec2 f_coord;
+
+void main()
+{
+	out_color = vec4(param[0].r, f_coord, 1.0);
+}