From 8f2e7413e5910c363355c06471d0fbb9e151e56a Mon Sep 17 00:00:00 2001
From: N0NameN0 <alonetrio@yahoo.com>
Date: Tue, 10 Nov 2009 09:50:41 +0000
Subject: [PATCH] [CHG] Optimization in tile calculation i only modded
 DrawTile, if this mod is ok for all and fully tested we need to make this
 change to all functions the needs calculation like this. (drawpart,
 drawtilequad, etc...)

---
 GRRLIB/GRRLIB/GRRLIB_bmf.c    | 2 ++
 GRRLIB/GRRLIB/GRRLIB_render.c | 8 ++++----
 GRRLIB/GRRLIB/grrlib.h        | 3 +++
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/GRRLIB/GRRLIB/GRRLIB_bmf.c b/GRRLIB/GRRLIB/GRRLIB_bmf.c
index ffd7a7d..f2b5045 100644
--- a/GRRLIB/GRRLIB/GRRLIB_bmf.c
+++ b/GRRLIB/GRRLIB/GRRLIB_bmf.c
@@ -111,5 +111,7 @@ void  GRRLIB_InitTileSet (GRRLIB_texImg *tex,
         tex->nbtileh = tex->h / tileh;
     tex->tilestart = tilestart;
     tex->tiledtex = true;
+    tex->ofnormaltexx = 1.0F/tex->nbtilew;	
+    tex->ofnormaltexy = 1.0F/tex->nbtileh;	
     GRRLIB_SetHandle( tex, 0, 0 );
 }
diff --git a/GRRLIB/GRRLIB/GRRLIB_render.c b/GRRLIB/GRRLIB/GRRLIB_render.c
index 1d08102..e771129 100644
--- a/GRRLIB/GRRLIB/GRRLIB_render.c
+++ b/GRRLIB/GRRLIB/GRRLIB_render.c
@@ -177,10 +177,10 @@ void  GRRLIB_DrawTile (const f32 xpos, const f32 ypos, const GRRLIB_texImg *tex,
     if (tex == NULL || tex->data == NULL)  return ;
 
     // The 0.001f/x is the frame correction formula by spiffen
-    s1 = ((     (frame %tex->nbtilew)   ) /(f32)tex->nbtilew) +(0.001f /tex->w);
-    s2 = ((     (frame %tex->nbtilew) +1) /(f32)tex->nbtilew) -(0.001f /tex->w);
-    t1 = (((int)(frame /tex->nbtilew)   ) /(f32)tex->nbtileh) +(0.001f /tex->h);
-    t2 = (((int)(frame /tex->nbtilew) +1) /(f32)tex->nbtileh) -(0.001f /tex->h);
+    s1 = (frame % tex->nbtilew) * tex->ofnormaltexx;
+    s2 = s1 + tex->ofnormaltexx;
+    t1 = (int)(frame/tex->nbtilew) * tex->ofnormaltexy;
+    t2 = t1 + tex->ofnormaltexy;
 
     GX_InitTexObj(&texObj, tex->data,
                   tex->tilew * tex->nbtilew, tex->tileh * tex->nbtileh,
diff --git a/GRRLIB/GRRLIB/grrlib.h b/GRRLIB/GRRLIB/grrlib.h
index 4a55208..f467739 100644
--- a/GRRLIB/GRRLIB/grrlib.h
+++ b/GRRLIB/GRRLIB/grrlib.h
@@ -115,6 +115,9 @@ typedef  struct GRRLIB_texImg {
     uint   nbtilew;     /**< Number of tiles for the x axis.   */
     uint   nbtileh;     /**< Number of tiles for the y axis.   */
     uint   tilestart;   /**< Offset to tile starting position. */
+    f32    ofnormaltexx; /**< Offset of normalized texture on x */
+    f32    ofnormaltexy; /**< Offset of normalized texture on y */
+
 
     void  *data;        /**< Pointer to the texture data. */
 } GRRLIB_texImg;