Mesa (master): mesa: Compute proper strides for compressed texture pixel storage.

[Chris Forbes]

Module: Mesa
Branch: master
Commit: be30766f5675cd1b6528a1a0b839c69aa894419d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=be30766f5675cd1b6528a1a0b839c69aa894419d

Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Mon Jun  2 15:50:09 2014 +1200

mesa: Compute proper strides for compressed texture pixel storage.

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/mesa/main/texstore.c |   35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/mesa/main/texstore.c b/src/mesa/main/texstore.c
index b5b7254..cb81f3f 100644
--- a/src/mesa/main/texstore.c
+++ b/src/mesa/main/texstore.c
@@ -4212,6 +4212,41 @@ _mesa_compute_compressed_pixelstore(GLuint dims, struct gl_texture_image *texIma
    store->TotalRowsPerSlice = store->CopyRowsPerSlice =
          (height + bh - 1) / bh;
    store->CopySlices = depth;
+
+   if (packing->CompressedBlockWidth &&
+       packing->CompressedBlockSize) {
+
+      bw = packing->CompressedBlockWidth;
+
+      if (packing->RowLength) {
+         store->TotalBytesPerRow = packing->CompressedBlockSize *
+            (packing->RowLength + bw - 1) / bw;
+      }
+
+      store->SkipBytes += packing->SkipPixels * packing->CompressedBlockSize / bw;
+   }
+
+   if (dims > 1 && packing->CompressedBlockHeight &&
+       packing->CompressedBlockSize) {
+
+      bh = packing->CompressedBlockHeight;
+
+      store->SkipBytes += packing->SkipRows * store->TotalBytesPerRow / bh;
+      store->CopyRowsPerSlice = (height + bh - 1) / bh;  /* rows in blocks */
+
+      if (packing->ImageHeight) {
+         store->TotalRowsPerSlice = (packing->ImageHeight + bh - 1) / bh;
+      }
+   }
+
+   if (dims > 2 && packing->CompressedBlockDepth &&
+       packing->CompressedBlockSize) {
+
+      int bd = packing->CompressedBlockDepth;
+
+      store->SkipBytes += packing->SkipImages * store->TotalBytesPerRow *
+            store->TotalRowsPerSlice / bd;
+   }
 }