[Mesa-dev] [PATCH 01/13] isl: Add func isl_tiling_from_drm_format_mod()

[Chad Versace]

It converts a DRM format modifier to enum isl_tiling. That's all.
---
 src/intel/isl/isl.c | 23 +++++++++++++++++++++++
 src/intel/isl/isl.h |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index ec8424cd48b..c70fac8a176 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -25,6 +25,8 @@
 #include <stdarg.h>
 #include <stdio.h>
 
+#include <drm_fourcc.h>
+
 #include "isl.h"
 #include "isl_gen4.h"
 #include "isl_gen6.h"
@@ -33,6 +35,10 @@
 #include "isl_gen9.h"
 #include "isl_priv.h"
 
+#ifndef DRM_FORMAT_MOD_LINEAR
+#define DRM_FORMAT_MOD_LINEAR 0 /* Linux 4.10 */
+#endif
+
 void PRINTFLIKE(3, 4) UNUSED
 __isl_finishme(const char *file, int line, const char *fmt, ...)
 {
@@ -60,6 +66,23 @@ static const struct {
    [9] = {64, 64, 32, 40},
 };
 
+enum isl_tiling
+isl_tiling_from_drm_format_mod(uint64_t mod)
+{
+   switch (mod) {
+   default:
+      unreachable("bad drm format modifier");
+   case DRM_FORMAT_MOD_LINEAR:
+      return ISL_TILING_LINEAR;
+   case I915_FORMAT_MOD_X_TILED:
+      return ISL_TILING_X;
+   case I915_FORMAT_MOD_Y_TILED:
+      return ISL_TILING_Y0;
+   case I915_FORMAT_MOD_Yf_TILED:
+      return ISL_TILING_Yf;
+   }
+}
+
 void
 isl_device_init(struct isl_device *dev,
                 const struct gen_device_info *info,
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index 4fcd416054d..597819f0a74 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1176,6 +1176,9 @@ bool
 isl_has_matching_typed_storage_image_format(const struct gen_device_info *devinfo,
                                             enum isl_format fmt);
 
+/** Behavior is undefined if isl does not recognize the modifier. */
+enum isl_tiling isl_tiling_from_drm_format_mod(uint64_t mod);
+
 static inline bool
 isl_tiling_is_any_y(enum isl_tiling tiling)
 {
-- 
2.12.0