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 <jason@jlekstrand.net>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>

2 files changed, 21 insertions, 5 deletions

diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index e01624b..d8260b2 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 {
diff --git a/src/intel/isl/isl_surface_state.c b/src/intel/isl/isl_surface_state.c
index 5c5386e..5845175 100644
--- a/src/intel/isl/isl_surface_state.c
+++ b/src/intel/isl/isl_surface_state.c
@@ -411,10 +411,10 @@ isl_genX(surf_fill_state_s)(const struct isl_device *dev, void *state,
 #endif
 
 #if (GEN_GEN >= 8 || GEN_IS_HASWELL)
-   s.ShaderChannelSelectRed = info->view->channel_select[0];
-   s.ShaderChannelSelectGreen = info->view->channel_select[1];
-   s.ShaderChannelSelectBlue = info->view->channel_select[2];
-   s.ShaderChannelSelectAlpha = info->view->channel_select[3];
+   s.ShaderChannelSelectRed = info->view->swizzle.r;
+   s.ShaderChannelSelectGreen = info->view->swizzle.g;
+   s.ShaderChannelSelectBlue = info->view->swizzle.b;
+   s.ShaderChannelSelectAlpha = info->view->swizzle.a;
 #endif
 
    s.SurfaceBaseAddress = info->address;