shaders: Add GLSL port of accum_sun.

Author: CrossVR

res/gamedata/shaders/gl/accum_sun.ps

@@ -0,0 +1,21 @@
+#include "common.h"
+#include "iostructs\v_volume.h"
+
+//////////////////////////////////////////////////////////////////////////////////////////
+uniform float4x4	m_texgen;
+#ifdef	USE_SJITTER
+uniform float4x4	m_texgen_J;
+#endif
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// Vertex
+v2p_volume _main ( float4 P )
+{
+	v2p_volume	O;
+	O.hpos 		= mul( m_WVP, P );
+	O.tc 		= mul( m_texgen, P );
+#ifdef	USE_SJITTER
+	O.tcJ 		= mul( m_texgen_J, P );
+#endif
+ 	return	O;
+}