From 6d483c2d9d1075df26fb51b1fc34f12e71fc5f5f Mon Sep 17 00:00:00 2001
From: Henri Verbeet <hverbeet@codeweavers.com>
Date: Wed, 7 Mar 2012 18:38:52 +0100
Subject: [PATCH] wined3d: Don't use floating point for surface height scaling.

This is the follow-up to commit a4e5bcff4c66aa1041ea32f971b92b40d73e7d72.
---
 dlls/wined3d/surface.c         | 10 ++++++++--
 dlls/wined3d/utils.c           |  9 ++++++---
 dlls/wined3d/wined3d_private.h |  8 +++++++-
 3 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 9ec3db38615..b7273f79b42 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -2282,7 +2282,10 @@ static void surface_upload_data(struct wined3d_surface *surface, const struct wi
     }
 
     if (format->flags & WINED3DFMT_FLAG_HEIGHT_SCALE)
-        update_h *= format->heightscale;
+    {
+        update_h *= format->height_scale.numerator;
+        update_h /= format->height_scale.denominator;
+    }
 
     ENTER_GL();
 
@@ -2517,7 +2520,10 @@ static void surface_allocate_surface(struct wined3d_surface *surface, const stru
     }
 
     if (format->flags & WINED3DFMT_FLAG_HEIGHT_SCALE)
-        height *= format->heightscale;
+    {
+        height *= format->height_scale.numerator;
+        height /= format->height_scale.denominator;
+    }
 
     TRACE("(%p) : Creating surface (target %#x)  level %d, d3d format %s, internal format %#x, width %d, height %d, gl format %#x, gl type=%#x\n",
             surface, surface->texture_target, surface->texture_level, debug_d3dformat(format->id),
diff --git a/dlls/wined3d/utils.c b/dlls/wined3d/utils.c
index e570a133414..847366e4d88 100644
--- a/dlls/wined3d/utils.c
+++ b/dlls/wined3d/utils.c
@@ -1285,7 +1285,8 @@ static BOOL init_format_texture_info(struct wined3d_gl_info *gl_info)
         format->glType = format_texture_info[i].gl_type;
         format->color_fixup = COLOR_FIXUP_IDENTITY;
         format->flags |= format_texture_info[i].flags;
-        format->heightscale = 1.0f;
+        format->height_scale.numerator = 1;
+        format->height_scale.denominator = 1;
 
         if (format->glGammaInternal != format->glInternal)
         {
@@ -1581,7 +1582,8 @@ static void apply_format_fixups(struct wined3d_gl_info *gl_info)
 
     idx = getFmtIdx(WINED3DFMT_YV12);
     gl_info->formats[idx].flags |= WINED3DFMT_FLAG_HEIGHT_SCALE;
-    gl_info->formats[idx].heightscale = 1.5f;
+    gl_info->formats[idx].height_scale.numerator = 3;
+    gl_info->formats[idx].height_scale.denominator = 2;
     gl_info->formats[idx].color_fixup = create_complex_fixup_desc(COMPLEX_FIXUP_YV12);
 
     if (gl_info->supported[EXT_PALETTED_TEXTURE] || gl_info->supported[ARB_FRAGMENT_PROGRAM])
@@ -1709,7 +1711,8 @@ UINT wined3d_format_calculate_size(const struct wined3d_format *format, UINT ali
     if (format->flags & WINED3DFMT_FLAG_HEIGHT_SCALE)
     {
         /* The D3D format requirements make sure that the resulting format is an integer again */
-        size = (UINT) (size * format->heightscale);
+        size *= format->height_scale.numerator;
+        size /= format->height_scale.denominator;
     }
 
     return size;
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index cd9690c6bc5..472c21a64aa 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -2805,6 +2805,12 @@ extern enum wined3d_format_id pixelformat_for_depth(DWORD depth) DECLSPEC_HIDDEN
 #define WINED3DFMT_FLAG_BLOCKS                      0x00020000
 #define WINED3DFMT_FLAG_HEIGHT_SCALE                0x00040000
 
+struct wined3d_rational
+{
+    UINT numerator;
+    UINT denominator;
+};
+
 struct wined3d_format
 {
     enum wined3d_format_id id;
@@ -2835,7 +2841,7 @@ struct wined3d_format
     GLint glType;
     UINT  conv_byte_count;
     unsigned int flags;
-    float heightscale;
+    struct wined3d_rational height_scale;
     struct color_fixup_desc color_fixup;
     void (*convert)(const BYTE *src, BYTE *dst, UINT pitch, UINT width, UINT height);
 };
-- 
2.11.4.GIT