soft: scale model texture s,t values

ref_gl renders use 0.0..1.0 float texture coordinates in gl commands
and skin ratio/resolution could be any.
ref_soft render uses absolute coordinates as result textures with
different to expected size are applied incorrectly.

Fix will not add support of scalled retextured skins, just fix case
when ratio is incorrect after scale down such or place a incorrect
pcx skin to the model directory.

src/client/refresh/soft/header/local.h

@@ -221,6 +221,8 @@ typedef struct
 	pixel_t	*pskin;
 	int	skinwidth;
 	int	skinheight;
+	float	scalewidth;
+	float	scaleheight;
 } affinetridesc_t;
 
 typedef struct

src/client/refresh/soft/sw_alias.c

@@ -526,8 +526,10 @@ R_AliasSetupSkin(const entity_t *currententity, const model_t *currentmodel)
 		return false;
 
 	r_affinetridesc.pskin = pskindesc->pixels[0];
-	r_affinetridesc.skinwidth = pskindesc->width;
+	r_affinetridesc.skinwidth = pskindesc->asset_width;
-	r_affinetridesc.skinheight = pskindesc->height;
+	r_affinetridesc.skinheight = pskindesc->asset_height;
+	r_affinetridesc.scalewidth = (float)pskindesc->asset_width / s_pmdl->skinwidth;
+	r_affinetridesc.scaleheight =  (float)pskindesc->asset_height / s_pmdl->skinheight;
 
 	return true;
 }

src/client/refresh/soft/sw_polyset.c

@@ -273,27 +273,41 @@ FloorDivMod(int numer, int denom, int *quo, int *rem)
 #if defined(__i386__) || defined(__amd64__)
 	q = numer / denom;
 	r = numer - q * denom;
+
 	if (-1/2 || 1/-2 || -1/-2) {
 		// long live C89
 		if (r < 0 && r < denom) {
 			q += 1;
 			r -= denom;
 		}
-	} else {
+	}
+	else
+	{
 		// C99 always truncates to 0
-		if ((numer ^ denom) < 0 && r != 0) {
+		if ((numer ^ denom) < 0 && r != 0)
+		{
 			q -= 1;
 			r += denom;
 		}
 	}
+
 	if ((numer < 0) ^ (denom < 0))
+	{
 		assert(q <= 0);
+	}
 	else
+	{
 		assert(q >= 0);
+	}
+
 	if (denom < 0)
+	{
 		assert(r > denom && r <= 0);
+	}
 	else
+	{
 		assert(r >= 0 && r < denom);
+	}
 #else
 	float num = numer, den = denom;
 	float	x;
@@ -754,8 +768,8 @@ R_PolysetDrawSpans8_Opaque (const entity_t *currententity, spanpackage_t *pspanp
 }
 
 static void
-R_ProcessLeftEdge(compactvert_t *plefttop, compactvert_t *prighttop,
+R_ProcessLeftEdge(const compactvert_t *plefttop, const compactvert_t *prighttop,
-		compactvert_t *pleftbottom)
+		const compactvert_t *pleftbottom)
 {
 	light3_t working_lstepx;
 	pixel_t	*d_ptex;
@@ -768,8 +782,8 @@ R_ProcessLeftEdge(compactvert_t *plefttop, compactvert_t *prighttop,
 	v = plefttop->v;
 	d_aspancount = plefttop->u - prighttop->u;
 
-	s = plefttop->s;
+	s = plefttop->s * r_affinetridesc.scalewidth;
-	t = plefttop->t;
+	t = plefttop->t * r_affinetridesc.scaleheight;
 	i = (s >> SHIFT16XYZ) + (t >> SHIFT16XYZ) * r_affinetridesc.skinwidth;
 	d_ptex = &r_affinetridesc.pskin[i];
 	d_sfrac = s & 0xFFFF;
@@ -794,7 +808,9 @@ R_ProcessLeftEdge(compactvert_t *plefttop, compactvert_t *prighttop,
 	// ceil (), but plus a little bit)
 	t = ubasestep < 0;
 	for (i = 0; i < 3; i++)
+	{
 		working_lstepx[i] = r_lstepx[i] - t;
+	}
 
 	// base steps for drawers
 	s = r_sstepy + r_sstepx * ubasestep;
@@ -805,7 +821,9 @@ R_ProcessLeftEdge(compactvert_t *plefttop, compactvert_t *prighttop,
 	d_tfracbasestep = t & 0xFFFF;
 
 	for (i = 0; i < 3; i++)
+	{
 		d_lightbasestep[i] = r_lstepy[i] + working_lstepx[i] * ubasestep;
+	}
 
 	d_zibasestep = r_zistepy + r_zistepx * ubasestep;
 
@@ -818,7 +836,9 @@ R_ProcessLeftEdge(compactvert_t *plefttop, compactvert_t *prighttop,
 	d_tfracextrastep = t & 0xFFFF;
 
 	for (i = 0; i < 3; i++)
+	{
 		d_lightextrastep[i] = d_lightbasestep[i] + working_lstepx[i];
+	}
 
 	d_ziextrastep = d_zibasestep + r_zistepx;
 
@@ -833,7 +853,8 @@ R_RasterizeAliasPolySmooth
 static void
 R_RasterizeAliasPolySmooth(const entity_t *currententity)
 {
-	compactvert_t *plefttop, *prighttop, *pleftbottom, *prightbottom;
+	const compactvert_t *pleftbottom, *prightbottom;
+	const compactvert_t *plefttop, *prighttop;
 	spanpackage_t *pstart;
 	int originalcount;
 	int leftheight, rightheight;