formats: Remove LxAx formats

The formats L8A8_UNORM and L16A16_UNORM are usually not supported, but
L8A8_SRGB might, and this results in problems because the host might
ask for a texture view of a L8A8_SRGB by using L8A8_UNORM, and this will
then fail. Removing these formats lets mesa pick suitable replacements on
the guest side. This helps with "The Talos Principle".

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

src/vrend_formats.c

@@ -94,10 +94,8 @@ static struct vrend_format_table base_depth_formats[] =
 static struct vrend_format_table base_la_formats[] = {
   { VIRGL_FORMAT_A8_UNORM, GL_ALPHA8, GL_ALPHA, GL_UNSIGNED_BYTE, NO_SWIZZLE },
   { VIRGL_FORMAT_L8_UNORM, GL_R8, GL_RED, GL_UNSIGNED_BYTE, RRR1_SWIZZLE },
-  { VIRGL_FORMAT_L8A8_UNORM, GL_LUMINANCE8_ALPHA8, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, NO_SWIZZLE },
   { VIRGL_FORMAT_A16_UNORM, GL_ALPHA16, GL_ALPHA, GL_UNSIGNED_SHORT, NO_SWIZZLE },
   { VIRGL_FORMAT_L16_UNORM, GL_R16, GL_RED, GL_UNSIGNED_SHORT, RRR1_SWIZZLE },
-  { VIRGL_FORMAT_L16A16_UNORM, GL_LUMINANCE16_ALPHA16, GL_LUMINANCE_ALPHA, GL_UNSIGNED_SHORT, NO_SWIZZLE },
 };
 
 static struct vrend_format_table rg_base_formats[] = {
@@ -249,7 +247,6 @@ static struct vrend_format_table srgb_formats[] = {
   { VIRGL_FORMAT_R8G8B8A8_SRGB, GL_SRGB8_ALPHA8, GL_RGBA, GL_UNSIGNED_BYTE, NO_SWIZZLE },
 
   { VIRGL_FORMAT_L8_SRGB, GL_SR8_EXT, GL_RED, GL_UNSIGNED_BYTE, RRR1_SWIZZLE },
-  { VIRGL_FORMAT_L8A8_SRGB, GL_SLUMINANCE8_ALPHA8_EXT, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, NO_SWIZZLE },
   { VIRGL_FORMAT_R8_SRGB, GL_SR8_EXT, GL_RED, GL_UNSIGNED_BYTE, NO_SWIZZLE },
 };