Implement particles as points.

Unfortunately, the maximum point size on Intel hardwar seems to be 1, so I
can't tell if the colors are right.

This is largely just a hacked version of GL's particle code.

include/QF/GLSL/qf_particles.h

@@ -0,0 +1,42 @@
+/*
+	qf_particles.h
+
+	GLSL specific particles stuff
+
+	Copyright (C) 2012 Bill Currie <bill@taniwha.org>
+
+	Author: Bill Currie <bill@taniwha.org>
+	Date: 2012/1/15
+
+	This program is free software; you can redistribute it and/or
+	modify it under the terms of the GNU General Public License
+	as published by the Free Software Foundation; either version 2
+	of the License, or (at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+	See the GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to:
+
+		Free Software Foundation, Inc.
+		59 Temple Place - Suite 330
+		Boston, MA  02111-1307, USA
+
+	$Id$
+*/
+#ifndef __QF_GLSL_qf_bsp_h
+#define __QF_GLSL_qf_bsp_h
+
+#include "QF/GLSL/types.h"
+
+typedef struct {
+	float       texcoord[2];
+	float       vertex[3];
+	byte        color[4];
+} partvert_t;
+
+#endif//__QF_GLSL_qf_bsp_h

libs/video/renderer/glsl/Makefile.am

@@ -5,12 +5,12 @@ INCLUDES= -I$(top_srcdir)/include $(GLX_CFLAGS)
 
 shader_src= \
 	quake2d.frag quakebsp.frag quakebsp.vert quakeico.vert quakemdl.frag \
-	quakemdl.vert quakeskb.frag quakeski.frag quakesky.vert \
+	quakemdl.vert quakepnt.frag quakepnt.vert quakeskb.frag quakeski.frag \
-	quakespr.frag quakespr.vert quaketrb.frag quaketxt.vert
+	quakesky.vert quakespr.frag quakespr.vert quaketrb.frag quaketxt.vert
 shader_gen= \
 	quake2d.fc quakebsp.fc quakebsp.vc quakeico.vc quakemdl.fc quakemdl.vc \
-	quakeskb.fc quakeski.fc quakesky.vc quakespr.fc quakespr.vc quaketrb.fc \
+	quakepnt.fc quakepnt.vc quakeskb.fc quakeski.fc quakesky.vc quakespr.fc \
-	quaketxt.vc
+	quakespr.vc quaketrb.fc quaketxt.vc
 
 glsl_src = \
 	glsl_alias.c glsl_bsp.c glsl_draw.c glsl_lightmap.c glsl_main.c \

libs/video/renderer/glsl/glsl_main.c

@@ -218,6 +218,7 @@ R_RenderView (void)
 	R_DrawSky ();
 	R_RenderEntities ();
 	R_DrawWaterSurfaces ();
+	R_DrawParticles ();
 	R_DrawViewModel ();
 }
 

libs/video/renderer/glsl/quakepnt.frag

@@ -1,4 +1,6 @@
 //precision mediump float;
+uniform sampler2D palette;
+
 varying float color;
 
 void
@@ -6,5 +8,5 @@ main (void)
 {
 	if (color == 1.0)
 		discard;
-	gl_FragColor = texture2D (palette, vec2 (pix, 0.0));
+	gl_FragColor = texture2D (palette, vec2 (color, 0.0));
 }

libs/video/renderer/glsl/quakepnt.vert

@@ -1,18 +1,19 @@
 uniform mat4 mvp_mat;
+attribute float vcolor;
 /** Vertex position.
 
 	x, y, z, c
 
 	c is the color of the point.
 */
-attribute vec4 vertex;
+attribute vec3 vertex;
 
 varying float color;
 
 void
 main (void)
 {
-	gl_Position = mvp_mat * vec4 (vertex.xyz, 1.0);
+	gl_Position = mvp_mat * vec4 (vertex, 1.0);
 	gl_PointSize = max (1, 32768.0 * abs (1.0 / gl_Position.z));
-	color = vertex.w;
+	color = vcolor;
 }