wined3d: Add texture flag for mipmap generation.

dlls/wined3d/texture.c

@@ -384,6 +384,15 @@ static HRESULT wined3d_texture_init(struct wined3d_texture *texture, const struc
         texture->flags |= WINED3D_TEXTURE_GET_DC;
     if (flags & WINED3D_TEXTURE_CREATE_DISCARD)
         texture->flags |= WINED3D_TEXTURE_DISCARD;
+    if (flags & WINED3D_TEXTURE_CREATE_GENERATE_MIPMAPS)
+    {
+        if (~format->flags[WINED3D_GL_RES_TYPE_TEX_2D]
+                & (WINED3DFMT_FLAG_RENDERTARGET | WINED3DFMT_FLAG_FILTERING))
+            WARN("Format doesn't support mipmaps generation, "
+                    "ignoring WINED3D_TEXTURE_CREATE_GENERATE_MIPMAPS flag.\n");
+        else
+            texture->flags |= WINED3D_TEXTURE_GENERATE_MIPMAPS;
+    }
 
     return WINED3D_OK;
 }
@@ -1573,8 +1582,13 @@ BOOL wined3d_texture_prepare_location(struct wined3d_texture *texture, unsigned
 
 void CDECL wined3d_texture_generate_mipmaps(struct wined3d_texture *texture)
 {
-    /* TODO: Implement filters using GL_SGI_generate_mipmaps. */
     FIXME("texture %p stub!\n", texture);
+
+    if (!(texture->flags & WINED3D_TEXTURE_GENERATE_MIPMAPS))
+    {
+        WARN("Texture without the WINED3D_TEXTURE_GENERATE_MIPMAPS flag, ignoring.\n");
+        return;
+    }
 }
 
 static struct wined3d_texture_sub_resource *wined3d_texture_get_sub_resource(struct wined3d_texture *texture,

dlls/wined3d/wined3d_private.h

@@ -3074,6 +3074,7 @@ struct wined3d_texture_ops
 #define WINED3D_TEXTURE_DC_IN_USE           0x00001000
 #define WINED3D_TEXTURE_DISCARD             0x00002000
 #define WINED3D_TEXTURE_GET_DC              0x00004000
+#define WINED3D_TEXTURE_GENERATE_MIPMAPS    0x00008000
 
 #define WINED3D_TEXTURE_ASYNC_COLOR_KEY     0x00000001
 

include/wine/wined3d.h

@@ -1538,6 +1538,7 @@ enum wined3d_shader_byte_code_format
 #define WINED3D_TEXTURE_CREATE_DISCARD                          0x00000002
 #define WINED3D_TEXTURE_CREATE_GET_DC_LENIENT                   0x00000004
 #define WINED3D_TEXTURE_CREATE_GET_DC                           0x00000008
+#define WINED3D_TEXTURE_CREATE_GENERATE_MIPMAPS                 0x00000010
 
 #define WINED3D_APPEND_ALIGNED_ELEMENT                          0xffffffff