shaders: Add GLSL port of accum_volumetric.

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.vs

@@ -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_nomsaa.vs

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

res/gamedata/shaders/gl/iostructs/p_volumetric.h

@@ -0,0 +1,39 @@
+
+out vec4 SV_Target;
+#ifdef MSAA_OPTIMIZATION
+in int gl_SampleID;
+#endif
+
+struct 	v2p
+{
+	float3 	lightToPos	; // TEXCOORD0;	// light center to plane vector
+	float3 	vPos		; // TEXCOORD1;	// position in camera space
+	float 	fDensity	; // TEXCOORD2;	// plane density along Z axis
+//	float2	tNoise 		; // TEXCOORD3;	// projective noise
+};
+
+layout(location = TEXCOORD0)	in float3 	v2p_lightToPos	; // TEXCOORD0;		// light center to plane vector
+layout(location = TEXCOORD1)	in float3 	v2p_vPos		; // TEXCOORD1;		// position in camera space
+layout(location = TEXCOORD2)	in float 	v2p_fDensity	; // TEXCOORD2;		// plane density along Z axis
+//layout(location = TEXCOORD3)	in float2	v2p_tNoise 		; // TEXCOORD3;		// projective noise
+
+#ifdef MSAA_OPTIMIZATION
+float4 _main ( v2p I, uint iSample );
+#else
+float4 _main ( v2p I );
+#endif
+
+void main()
+{
+	v2p	I;
+	I.lightToPos = v2p_lightToPos;
+	I.vPos		= v2p_vPos;
+	I.fDensity	= v2p_fDensity;
+//	I.tNoise	= v2p_tNoise;
+
+#ifdef MSAA_OPTIMIZATION
+	SV_Target	= _main ( I, gl_SampleID );
+#else
+	SV_Target	= _main ( I );
+#endif
+}

res/gamedata/shaders/gl/iostructs/v_volumetric.h

@@ -0,0 +1,41 @@
+
+out gl_PerVertex
+{
+	vec4 gl_Position;
+	float gl_ClipDistance[6];
+};
+
+struct v2p
+{
+	float3 	lightToPos	; // TEXCOORD0;		// light center to plane vector
+	float3 	vPos		; // TEXCOORD1;		// position in camera space
+	float 	fDensity	; // TEXCOORD2;		// plane density alon Z axis
+//	float2	tNoise 		; // TEXCOORD3;		// projective noise
+	float3	clip0		; // SV_ClipDistance0;
+	float3	clip1		; // SV_ClipDistance1;
+	float4 	hpos		; // SV_Position;
+};
+
+layout(location = POSITION)		in float3	v_volumetric_P;
+
+layout(location = TEXCOORD0)	out float3 	v2p_lightToPos	; // TEXCOORD0;		// light center to plane vector
+layout(location = TEXCOORD1)	out float3 	v2p_vPos		; // TEXCOORD1;		// position in camera space
+layout(location = TEXCOORD2)	out float 	v2p_fDensity	; // TEXCOORD2;		// plane density alon Z axis
+//layout(location = TEXCOORD3)	out float2	v2p_tNoise 		; // TEXCOORD3;		// projective noise
+
+v2p _main ( float3 P );
+
+void main()
+{
+	v2p O	= _main ( v_volumetric_P );
+	v2p_lightToPos	= O.lightToPos;
+	v2p_vPos		= O.vPos;
+	v2p_fDensity	= O.fDensity;
+//	v2p_tNoise		= O.tNoise;
+	gl_Position		= O.hpos;
+	for (int i=0; i<3; ++i)
+	{
+		gl_ClipDistance[i] = O.clip0[i];
+		gl_ClipDistance[i+3] = O.clip1[i];
+	}
+}