intel/isl: Add an isl_swizzle structure and use it for isl_view swizzles

This should be more compact than the enum isl_channel_select[4] that we
were using before.  It's also very convenient because we already had such a
structure in the Vulkan driver we just needed to pull it over.

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Topi Pohjolainen <[email protected]>

1 files changed, 17 insertions, 1 deletions

diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index e01624bfae9..d8260b2a0c5 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -854,6 +854,22 @@ struct isl_surf {
    isl_surf_usage_flags_t usage;
 };
 
+struct isl_swizzle {
+   enum isl_channel_select r:4;
+   enum isl_channel_select g:4;
+   enum isl_channel_select b:4;
+   enum isl_channel_select a:4;
+};
+
+#define ISL_SWIZZLE(R, G, B, A) ((struct isl_swizzle) { \
+      .r = ISL_CHANNEL_SELECT_##R, \
+      .g = ISL_CHANNEL_SELECT_##G, \
+      .b = ISL_CHANNEL_SELECT_##B, \
+      .a = ISL_CHANNEL_SELECT_##A, \
+   })
+
+#define ISL_SWIZZLE_IDENTITY ISL_SWIZZLE(RED, GREEN, BLUE, ALPHA)
+
 struct isl_view {
    /**
     * Indicates the usage of the particular view
@@ -889,7 +905,7 @@ struct isl_view {
    uint32_t base_array_layer;
    uint32_t array_len;
 
-   enum isl_channel_select channel_select[4];
+   struct isl_swizzle swizzle;
 };
 
 union isl_color_value {