shaders: Add GLSL port of accum_volumetric.

Author: CrossVR

res/gamedata/shaders/gl/accum_volume.vs

@@ -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;
+}

res/gamedata/shaders/gl/accum_volumetric.ps

@@ -0,0 +1,34 @@
+#include "common.h"
+#include "iostructs\v_volumetric.h"
+
+//cbuffer VolumetricLights
+//{
+uniform	float3	vMinBounds;
+uniform	float3	vMaxBounds;
+uniform	float4	FrustumClipPlane[6];
+//}
+
+v2p _main ( float3 P )
+{
+	v2p 		o;
+	float4	vPos;
+	vPos.xyz 	= lerp( vMinBounds, vMaxBounds, P);	//	Position in camera space
+	vPos.w 		= 1;
+	o.hpos 		= mul			(m_P, vPos);		// xform, input in camera coordinates
+
+	o.lightToPos = vPos.xyz - Ldynamic_pos.xyz;
+	o.vPos = vPos.xyz;
+
+//	o.fDensity = (vMaxBounds.z-vMinBounds.z)/2000.0f;
+//	o.fDensity = (vMaxBounds.z-vMinBounds.z)/2000.0f*2;
+	o.fDensity = 1.0f/40.0f;
+//	o.fDensity = 1.0f/20.0f;
+
+	for (int i=0; i<3; ++i)
+	{
+		o.clip0[i] = dot( o.hpos, FrustumClipPlane[i]);
+		o.clip1[i] = dot( o.hpos, FrustumClipPlane[i+3]);
+	}
+
+	return o;
+}

res/gamedata/shaders/gl/accum_volumetric.vs

@@ -0,0 +1 @@
+#include "accum_volumetric.vs"