shaders: Add GLSL port of portal.

Author: CrossVR

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

@@ -0,0 +1,11 @@
+
+out vec4 SV_Target;
+
+layout(location = COLOR0)		in float4	p_portal_C	; // COLOR0; 
+
+float4 _main ( float4 C );
+
+void main()
+{
+	SV_Target	= _main (p_portal_C);
+}

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

@@ -0,0 +1,35 @@
+
+out gl_PerVertex { vec4 gl_Position; };
+
+struct	v_vert
+{
+	float4 	pos	; // POSITION;	// (float,float,float,1)
+	float4	color	; // COLOR0;	// (r,g,b,dir-occlusion)
+};
+struct 	v2p
+{
+	float4 c	; // COLOR0;
+	float  fog	; // FOG;
+	float4 hpos	; // SV_Position;
+};
+
+layout(location = POSITION)		in float4	v_portal_pos	; // POSITION;	// (float,float,float,1)
+layout(location = COLOR0)		in float4	v_portal_color	; // COLOR0;	// (r,g,b,dir-occlusion)
+
+layout(location = COLOR0) 		out float4	v2p_portal_c	; // COLOR0;
+layout(location = FOG) 			out float	v2p_portal_fog	; // FOG;
+
+v2p _main ( v_vert I );
+
+void main()
+{
+	v_vert		I;
+	I.pos		= v_portal_pos;
+	I.color		= v_portal_color;
+
+	v2p O 		= _main (I);
+
+	v2p_portal_c = O.c;
+	v2p_portal_fog = O.fog;
+	gl_Position = O.hpos;
+}

res/gamedata/shaders/gl/portal.ps

@@ -0,0 +1,23 @@
+#include "common.h"
+#include "iostructs\v_portal.h"
+
+v2p _main (v_vert v)
+{
+	v2p 		o;
+
+	o.hpos		= mul(m_VP, v.pos);				// xform, input in world coords
+	o.c			= v.color;
+	o.fog 		= calc_fogging(v.pos);			// fog, input in world coords
+	o.fog 		= saturate(o.fog);
+	o.c.rgb 	= lerp(fog_color.rgb, o.c.rgb, o.fog);
+
+//	float scale = tex2Dlod	(s_tonemap,float4(.5,.5,.5,.5)).x ;
+//	float scale = s_tonemap.Load(int3(0,0,0)).x;
+//	float scale = s_tonemap.Load(int3(1,1,0)).x;
+	float scale = texelFetch(s_tonemap,int2(0,0),0).x;
+	o.c.rgb		= o.c.rgb*scale;      		// copy color, pre-scale by tonemap //float4 ( v.c.rgb*scale*2, v.c.a );
+	o.c.a		= o.fog;
+
+	return o;
+	
+}