wgl: Add a driconf option to force pixel formats with GDI support

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39465>

src/gallium/frontends/wgl/stw_device.c

@@ -113,6 +113,7 @@ static const driOptionDescription gallium_driconf[] = {
 DRI_CONF_SECTION("WGL")
    DRI_CONF_WGL_FRAME_LATENCY(2)
    DRI_CONF_WGL_SWAP_INTERVAL(1)
+   DRI_CONF_WGL_REQUIRE_GDI_COMPAT(false)
 DRI_CONF_SECTION_END
 };
 

src/gallium/frontends/wgl/stw_pixelformat.c

@@ -264,6 +264,9 @@ add_color_format_variants(const struct stw_pf_color_info *color_formats,
       bind_flags |= PIPE_BIND_DISPLAY_TARGET;
    }
 
+   bool require_gdi_compat =
+      driQueryOptionb(&stw_dev->option_cache, "wgl_require_gdi_compat");
+
    for (ms = 0; ms < ARRAY_SIZE(stw_pf_multisample); ms++) {
       unsigned samples = stw_pf_multisample[ms];
 
@@ -288,6 +291,8 @@ add_color_format_variants(const struct stw_pf_color_info *color_formats,
             }
 
             for (f = 0; f < ARRAY_SIZE(stw_pf_flag); f++) {
+               if (require_gdi_compat && (stw_pf_flag[f] & PFD_SUPPORT_GDI) == 0)
+                  continue;
                for (acc = 0; acc < 2; acc++) {
                   stw_pixelformat_add(stw_dev, extended, &color_formats[cfmt],
                                        depth, acc * 16, stw_pf_flag[f], samples);

src/util/driconf.h

@@ -581,6 +581,10 @@
    DRI_CONF_OPT_I(wgl_swap_interval, def, 1, 4, \
                   "Override default swap interval")
 
+#define DRI_CONF_WGL_REQUIRE_GDI_COMPAT(def) \
+   DRI_CONF_OPT_B(wgl_require_gdi_compat, def, \
+                  "Require all pixel formats to have PFD_SUPPORT_GDI flag")
+
 /**
  * \brief virgl specific configuration options
  */