From 93783908b793eb2f1df1e705cc7d29489cf409b3 Mon Sep 17 00:00:00 2001
From: eihrul <eihrul@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Mon, 1 Feb 2010 10:15:46 +0000
Subject: [PATCH] check if a model's textures have deforms that need
 normals/tangents at load-time, and pass in appropriate flags to
 RSurf_ActiveModelEntity based on this when rendering models with depthonly
 (fixes Nexuiz flag z-fighting)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9918 d7cf8633-e32d-0410-b094-e92efae38249
---
 gl_rmain.c     | 14 +++++++++++++-
 model_shared.c | 27 +++++++++++++++++++++++++++
 model_shared.h |  2 ++
 3 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/gl_rmain.c b/gl_rmain.c
index 04b58483..68ca03a4 100644
--- a/gl_rmain.c
+++ b/gl_rmain.c
@@ -12287,7 +12287,19 @@ void R_DrawModelSurfaces(entity_render_t *ent, qboolean skysurfaces, qboolean wr
 	else if (prepass)
 		RSurf_ActiveModelEntity(ent, true, true, true);
 	else if (depthonly)
-		RSurf_ActiveModelEntity(ent, false, false, false);
+	{
+		switch (vid.renderpath)
+		{
+		case RENDERPATH_GL20:
+		case RENDERPATH_CGGL:
+			RSurf_ActiveModelEntity(ent, model->wantnormals, model->wanttangents, false);
+			break;
+		case RENDERPATH_GL13:
+		case RENDERPATH_GL11:
+			RSurf_ActiveModelEntity(ent, model->wantnormals, false, false);
+			break;
+		}
+	}
 	else
 	{
 		switch (vid.renderpath)
diff --git a/model_shared.c b/model_shared.c
index 45fd3143..74485ec1 100644
--- a/model_shared.c
+++ b/model_shared.c
@@ -311,6 +311,31 @@ void Mod_FrameGroupify(dp_model_t *mod, const char *buf)
 	Mod_FrameGroupify_ParseGroups(buf, Mod_FrameGroupify_ParseGroups_Store, mod);
 }
 
+void Mod_FindPotentialDeforms(dp_model_t *mod)
+{
+	int i, j;
+	texture_t *texture;
+	mod->wantnormals = false;
+	mod->wanttangents = false;
+	for (i = 0;i < mod->num_textures;i++)
+	{
+		texture = mod->data_textures + i;
+		if (texture->tcgen.tcgen == Q3TCGEN_ENVIRONMENT)
+			mod->wantnormals = true;
+		for (j = 0;j < Q3MAXDEFORMS;j++)
+		{
+			if (texture->deforms[j].deform == Q3DEFORM_AUTOSPRITE)
+			{
+				mod->wanttangents = true;
+				mod->wantnormals = true;
+				break;
+			}
+			if (texture->deforms[j].deform != Q3DEFORM_NONE)
+				mod->wantnormals = true;
+		}
+	}
+}
+
 /*
 ==================
 Mod_LoadModel
@@ -447,6 +472,8 @@ dp_model_t *Mod_LoadModel(dp_model_t *mod, qboolean crash, qboolean checkdisk)
 		else Con_Printf("Mod_LoadModel: model \"%s\" is of unknown/unsupported type\n", mod->name);
 		Mem_Free(buf);
 
+		Mod_FindPotentialDeforms(mod);
+					
 		buf = FS_LoadFile (va("%s.framegroups", mod->name), tempmempool, false, &filesize);
 		if(buf)
 		{
diff --git a/model_shared.h b/model_shared.h
index 1e0c7794..8256dc71 100644
--- a/model_shared.h
+++ b/model_shared.h
@@ -882,6 +882,8 @@ typedef struct model_s
 	int				num_textures;
 	int				num_texturesperskin;
 	texture_t		*data_textures;
+	qboolean		wantnormals;
+	qboolean		wanttangents;
 	// surfaces of this model
 	int				num_surfaces;
 	msurface_t		*data_surfaces;
-- 
2.39.2