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authorJason Ekstrand <jason.ekstrand@intel.com>2016-09-01 18:57:01 -0700
committerJason Ekstrand <jason.ekstrand@intel.com>2016-10-03 14:53:01 -0700
commit5637f3f1202b46ff02c80e743dd84752a040685a (patch)
tree44d2b312053204f14dc752ecb77ed13f9d5578e5 /src/intel/isl/isl_format.c
parentb7a0f2e1f769314d88d902c8506250d18393d359 (diff)
intel/isl: Add a format_supports_multisampling helper
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Chad Versace <chadversary@chromium.org> Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>
Diffstat (limited to 'src/intel/isl/isl_format.c')
-rw-r--r--src/intel/isl/isl_format.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/intel/isl/isl_format.c b/src/intel/isl/isl_format.c
index 2804463b127..81c01e0b8ca 100644
--- a/src/intel/isl/isl_format.c
+++ b/src/intel/isl/isl_format.c
@@ -429,6 +429,34 @@ isl_format_supports_lossless_compression(const struct gen_device_info *devinfo,
return format_gen(devinfo) >= format_info[format].lossless_compression;
}
+bool
+isl_format_supports_multisampling(const struct gen_device_info *devinfo,
+ enum isl_format format)
+{
+ /* From the Sandybridge PRM, Volume 4 Part 1 p72, SURFACE_STATE, Surface
+ * Format:
+ *
+ * If Number of Multisamples is set to a value other than
+ * MULTISAMPLECOUNT_1, this field cannot be set to the following
+ * formats:
+ *
+ * - any format with greater than 64 bits per element
+ * - any compressed texture format (BC*)
+ * - any YCRCB* format
+ *
+ * The restriction on the format's size is removed on Broadwell.
+ */
+ if (devinfo->gen < 8 && isl_format_get_layout(format)->bpb > 64) {
+ return false;
+ } else if (isl_format_is_compressed(format)) {
+ return false;
+ } else if (isl_format_is_yuv(format)) {
+ return false;
+ } else {
+ return true;
+ }
+}
+
static inline bool
isl_format_has_channel_type(enum isl_format fmt, enum isl_base_type type)
{