geometry shaders, map poi icons

shaders/map_poi.geom

@@ -0,0 +1,30 @@
+layout (points) in;
+layout (triangle_strip, max_vertices = 4) out;
+
+in vec2 g_coords[];
+out vec2 f_coords;
+
+#include <common>
+
+void main() {
+	vec4 position = gl_in[0].gl_Position;
+	vec2 size = vec2(0.1) * scene_extra.xy;
+
+	gl_Position = position + vec4(-size.x, -size.y, 0.0, 0.0);
+	f_coords = vec2(g_coords[0].s, 0.0);
+	EmitVertex();
+
+	gl_Position = position + vec4( size.x, -size.y, 0.0, 0.0);
+	f_coords = vec2(g_coords[0].t, 0.0);
+	EmitVertex();
+
+	gl_Position = position + vec4(-size.x,  size.y, 0.0, 0.0);
+	f_coords = vec2(g_coords[0].s, 1.0);
+	EmitVertex();
+
+	gl_Position = position + vec4( size.x,  size.y, 0.0, 0.0);
+	f_coords = vec2(g_coords[0].t, 1.0);
+	EmitVertex();
+
+    EndPrimitive();
+}