From 42d810b3204dc35b0bc52dfb2e0a45c72b45e56f Mon Sep 17 00:00:00 2001
From: Eukara <eukara@users.sourceforge.net>
Date: Sat, 5 Sep 2020 18:58:12 +0000
Subject: [PATCH] Support for HL SPR's INDEXALPHA blend type.

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5754 fc73d0e0-1445-4013-8a0c-d673dee63da5
---
 engine/gl/gl_model.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/engine/gl/gl_model.c b/engine/gl/gl_model.c
index ccb14c3b2..3705e31c5 100644
--- a/engine/gl/gl_model.c
+++ b/engine/gl/gl_model.c
@@ -5949,8 +5949,14 @@ qboolean QDECL Mod_LoadSpriteModel (model_t *mod, void *buffer, size_t fsize)
 
 		if (rendertype == SPRHL_INDEXALPHA)
 		{
-			Con_Printf(CON_ERROR "%s: SPRHL_INDEXALPHA sprites are not supported\n", mod->name);
-			return false;
+			/* alpha value is equivalent to palette index - eukara */
+			for (i = 0; i < 256; i++)
+			{
+				pal[i*4+0] = *src++;
+				pal[i*4+1] = *src++;
+				pal[i*4+2] = *src++;
+				pal[i*4+3] = i;
+			}
 		}
 		else
 		{