Draw instances from the GPU culling with indirect draws, occlusion culling and a depth prepass

shaders/depthprepass.vert

@@ -0,0 +1,20 @@
+// depth prepass of the instances drawn from the gpu culling (opengl46_renderer::Render_Instances_Indirect()).
+// the position is worked out the way vertex.vert of the materials does it, and declared invariant in both, so the colour
+// pass which follows gets the same depth for the same surface
+
+layout(location = 0) in vec3 v_vert;
+layout(location = 2) in vec2 v_coord;
+
+#include <common>
+
+invariant gl_Position;
+
+out vec2 f_coord;
+
+void main()
+{
+	mat4 mv = effective_modelview();
+	vec4 position = mv * vec4(v_vert, 1.0);
+	gl_Position = projection * position;
+	f_coord = v_coord;
+}