Make a start on alias model rendering.

The vertex and fragment shaders are written, and R_InitAlias is stubbed,
but that's it so far.

libs/video/renderer/glsl/Makefile.am

@@ -7,8 +7,8 @@ shader_src= quake2d.frag quakeico.vert quakespr.frag quakespr.vert quaketxt.vert
 shader_gen= quake2d.fc quakeico.vc quakespr.fc quakespr.vc quaketxt.vc
 
 glsl_src = \
-	glsl_draw.c glsl_main.c glsl_particles.c glsl_screen.c glsl_sprite.c \
-	glsl_textures.c
+	glsl_alias.c glsl_draw.c glsl_main.c glsl_particles.c glsl_screen.c \
+	glsl_sprite.c glsl_textures.c
 
 if BUILD_GL
 noinst_LTLIBRARIES=	libglsl.la

libs/video/renderer/glsl/glsl_alias.c

@@ -0,0 +1,50 @@
+/*
+	glsl_alias.c
+
+	GLSL Alias model rendering
+
+	Copyright (C) 2012 Bill Currie <bill@taniwha.org>
+
+	Author: Bill Currie <bill@taniwha.org>
+	Date: 2012/1/1
+
+	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
+
+*/
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+static __attribute__ ((used)) const char rcsid[] = "$Id$";
+
+#ifdef HAVE_STRING_H
+# include <string.h>
+#endif
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif
+
+#include "QF/GLSL/defines.h"
+#include "QF/GLSL/funcs.h"
+#include "QF/GLSL/qf_alias.h"
+
+VISIBLE void
+R_InitAlias (void)
+{
+}

libs/video/renderer/glsl/quakemdl.frag

@@ -0,0 +1,24 @@
+uniform sampler2D palette;
+uniform sampler2D colormap;
+uniform sampler2D skin;
+uniform float ambient;
+uniform float shadelight;
+uniform vec3 lightvec;
+
+varying vec3 normal;
+varying vec2 st;
+varying vec4 color;
+
+void
+main (void)
+{
+	float       pix = texture2D (skin, st).r;
+	float       light = ambient;
+	float       d;
+
+	d = dot (normal, lightvec);
+	d = min (d, 0.0);
+	light += d * shadelight;
+	col = texture2D (colormap, vec2 (pix, light)).r;
+	gl_FragColor = texture2D (palette, vec2 (col, 0.5));
+}

libs/video/renderer/glsl/quakemdl.vert

@@ -0,0 +1,24 @@
+uniform sampler2D normals;
+uniform mat4 mvp_mat;
+
+attribute vec4 vcolor;
+attribute vec3 stn;
+attribute vec3 vertex;
+
+varying vec3 normal;
+varying vec2 st;
+varying vec4 color;
+
+void
+main (void)
+{
+	float nind;
+	vec3  norma, normb;
+	gl_Position = mvp_mat * vec4 (vertex, 1.0);
+	st = stn.st;
+	nind = stn.p;
+	norma = texture2D (normals, vec2 (nind, 0.0));
+	normb = texture2D (normals, vec2 (nind, 1.0));
+	normal = norma + normb / 256.0;
+	color = vcolor;
+}