Mesa (master): mesa: Add a helper function to query 3D block sizes

[Anuj Phogat]

Module: Mesa
Branch: master
Commit: 9163c37349a2f4ddb3ebc2722f8a768e282884a0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9163c37349a2f4ddb3ebc2722f8a768e282884a0

Author: Anuj Phogat <anuj.phogat at gmail.com>
Date:   Wed Mar  9 11:38:54 2016 -0800

mesa: Add a helper function to query 3D block sizes

Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/main/formats.c | 21 +++++++++++++++++++++
 src/mesa/main/formats.h |  4 ++++
 2 files changed, 25 insertions(+)

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 3d2349b..cfaac04 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -321,6 +321,27 @@ _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh)
 
 
 /**
+ * Return the block size (in pixels) for the given format. Normally
+ * the block size is 1x1x1. But compressed formats will have block
+ * sizes of 4x4x4, 3x3x3 pixels, etc.
+ * \param bw  returns block width in pixels
+ * \param bh  returns block height in pixels
+ * \param bd  returns block depth in pixels
+ */
+void
+_mesa_get_format_block_size_3d(mesa_format format,
+                               GLuint *bw,
+                               GLuint *bh,
+                               GLuint *bd)
+{
+   const struct gl_format_info *info = _mesa_get_format_info(format);
+   *bw = info->BlockWidth;
+   *bh = info->BlockHeight;
+   *bd = info->BlockDepth;
+}
+
+
+/**
  * Returns the an array of four numbers representing the transformation
  * from the RGBA or SZ colorspace to the given format.  For array formats,
  * the i'th RGBA component is given by:
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 794d599..c6653bc 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -663,6 +663,10 @@ _mesa_get_format_base_format(uint32_t format);
 extern void
 _mesa_get_format_block_size(mesa_format format, GLuint *bw, GLuint *bh);
 
+extern void
+_mesa_get_format_block_size_3d(mesa_format format, GLuint *bw,
+                               GLuint *bh, GLuint *bd);
+
 extern mesa_array_format
 _mesa_array_format_flip_channels(mesa_array_format format);