1 files changed, 74 insertions, 0 deletions
diff --git a/src/isl/isl_gen4.c b/src/isl/isl_gen4.c
new file mode 100644
index 00000000000..52aa5655bb2
--- /dev/null
+++ b/src/isl/isl_gen4.c
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2015 Intel Corporation
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a
+ *  copy of this software and associated documentation files (the "Software"),
+ *  to deal in the Software without restriction, including without limitation
+ *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ *  and/or sell copies of the Software, and to permit persons to whom the
+ *  Software is furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice (including the next
+ *  paragraph) shall be included in all copies or substantial portions of the
+ *  Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ *  IN THE SOFTWARE.
+ */
+
+#include "isl_gen4.h"
+#include "isl_priv.h"
+
+bool
+gen4_choose_msaa_layout(const struct isl_device *dev,
+                        const struct isl_surf_init_info *info,
+                        enum isl_tiling tiling,
+                        enum isl_msaa_layout *msaa_layout)
+{
+   /* Gen4 and Gen5 do not support MSAA */
+   assert(info->samples >= 1);
+
+   *msaa_layout = ISL_MSAA_LAYOUT_NONE;
+   return true;
+}
+
+void
+gen4_choose_image_alignment_el(const struct isl_device *dev,
+                               const struct isl_surf_init_info *restrict info,
+                               enum isl_tiling tiling,
+                               enum isl_msaa_layout msaa_layout,
+                               struct isl_extent3d *image_align_el)
+{
+   assert(info->samples == 1);
+   assert(msaa_layout == ISL_MSAA_LAYOUT_NONE);
+   assert(!isl_tiling_is_std_y(tiling));
+
+   /* Note that neither the surface's horizontal nor vertical image alignment
+    * is programmable on gen4 nor gen5.
+    *
+    * From the G35 PRM (2008-01), Volume 1 Graphics Core, Section 6.17.3.4
+    * Alignment Unit Size:
+    *
+    *    Note that the compressed formats are padded to a full compression
+    *    cell.
+    *
+    *    +------------------------+--------+--------+
+    *    | format                 | halign | valign |
+    *    +------------------------+--------+--------+
+    *    | YUV 4:2:2 formats      |      4 |      2 |
+    *    | uncompressed formats   |      4 |      2 |
+    *    +------------------------+--------+--------+
+    */
+
+   if (isl_format_is_compressed(info->format)) {
+      *image_align_el = isl_extent3d(1, 1, 1);
+      return;
+   }
+
+   *image_align_el = isl_extent3d(4, 2, 1);
+}