intel/isl: Add a helper to get a subimage surface

We already have a helper for doing this in BLORP, this just moves the
logic into ISL where we can share it with other components.

Reviewed-by: Lionel Landwerlin <[email protected]>

2 files changed, 64 insertions, 0 deletions

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index fba40caff41..5e3d279b0b6 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -2318,6 +2318,47 @@ isl_surf_get_image_offset_B_tile_sa(const struct isl_surf *surf,
 }
 
 void
+isl_surf_get_image_surf(const struct isl_device *dev,
+                        const struct isl_surf *surf,
+                        uint32_t level,
+                        uint32_t logical_array_layer,
+                        uint32_t logical_z_offset_px,
+                        struct isl_surf *image_surf,
+                        uint32_t *offset_B,
+                        uint32_t *x_offset_sa,
+                        uint32_t *y_offset_sa)
+{
+   isl_surf_get_image_offset_B_tile_sa(surf,
+                                       level,
+                                       logical_array_layer,
+                                       logical_z_offset_px,
+                                       offset_B,
+                                       x_offset_sa,
+                                       y_offset_sa);
+
+   /* Even for cube maps there will be only single face, therefore drop the
+    * corresponding flag if present.
+    */
+   const isl_surf_usage_flags_t usage =
+      surf->usage & (~ISL_SURF_USAGE_CUBE_BIT);
+
+   bool ok UNUSED;
+   ok = isl_surf_init(dev, image_surf,
+                      .dim = ISL_SURF_DIM_2D,
+                      .format = surf->format,
+                      .width = isl_minify(surf->logical_level0_px.w, level),
+                      .height = isl_minify(surf->logical_level0_px.h, level),
+                      .depth = 1,
+                      .levels = 1,
+                      .array_len = 1,
+                      .samples = surf->samples,
+                      .row_pitch = surf->row_pitch,
+                      .usage = usage,
+                      .tiling_flags = (1 << surf->tiling));
+   assert(ok);
+}
+
+void
 isl_tiling_get_intratile_offset_el(enum isl_tiling tiling,
                                    uint32_t bpb,
                                    uint32_t row_pitch,
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index 1e5b8689542..dafe952298e 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1842,6 +1842,29 @@ isl_surf_get_image_offset_B_tile_sa(const struct isl_surf *surf,
                                     uint32_t *y_offset_sa);
 
 /**
+ * Create an isl_surf that represents a particular subimage in the surface.
+ *
+ * The newly created surface will have a single miplevel and array slice.  The
+ * surface lives at the returned byte and intratile offsets, in samples.
+ *
+ * It is safe to call this function with surf == image_surf.
+ *
+ * @invariant level < surface levels
+ * @invariant logical_array_layer < logical array length of surface
+ * @invariant logical_z_offset_px < logical depth of surface at level
+ */
+void
+isl_surf_get_image_surf(const struct isl_device *dev,
+                        const struct isl_surf *surf,
+                        uint32_t level,
+                        uint32_t logical_array_layer,
+                        uint32_t logical_z_offset_px,
+                        struct isl_surf *image_surf,
+                        uint32_t *offset_B,
+                        uint32_t *x_offset_sa,
+                        uint32_t *y_offset_sa);
+
+/**
  * @brief Calculate the intratile offsets to a surface.
  *
  * In @a base_address_offset return the offset from the base of the surface to