iris: Properly allow rendering to RGBX formats.

I was converting them at pipe_surface creation time, but not when
answering queries about whether formats support rendering.  This caused
a lot of FBO incomplete errors for formats that ought to be supported.

Fixes "Child of Light", which uses PIPE_FORMAT_R8G8B8X8_UNORM_SRGB.

Also fixes Witcher 1 using wined3d (GL) according to Timur Kristóf.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109738

diff --git a/src/gallium/drivers/iris/iris_formats.c b/src/gallium/drivers/iris/iris_formats.c
index 8a53bc19f3f0bc2803c899866e02f561098e6618..c160d19f4eac5d960c75ea3898b3223bdf3bbc00 100644 (file)
--- a/src/gallium/drivers/iris/iris_formats.c
+++ b/src/gallium/drivers/iris/iris_formats.c
@@ -427,9 +427,16 @@ iris_is_format_supported(struct pipe_screen *pscreen,
    }
 
    if (usage & PIPE_BIND_RENDER_TARGET) {
-      supported &= isl_format_supports_rendering(devinfo, format);
+      enum isl_format rt_format = format;
+
+      if (isl_format_is_rgbx(format) &&
+          !isl_format_supports_rendering(devinfo, format))
+         rt_format = isl_format_rgbx_to_rgba(format);
+
+      supported &= isl_format_supports_rendering(devinfo, rt_format);
+
       if (!is_integer)
-         supported &= isl_format_supports_alpha_blending(devinfo, format);
+         supported &= isl_format_supports_alpha_blending(devinfo, rt_format);
    }
 
    if (usage & PIPE_BIND_SHADER_IMAGE) {