mesa: added _mesa_get_format_block_size()

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 773a8f7..72d043c 100644 (file)
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -753,6 +753,22 @@ _mesa_get_format_base_format(gl_format format)
 }
 
 
+/**
+ * Return the block size (in pixels) for the given format.  Normally
+ * the block size is 1x1.  But compressed formats will have block sizes
+ * of 4x4 or 8x4 pixels, etc.
+ * \param bw  returns block width in pixels
+ * \param bh  returns block height in pixels
+ */
+void
+_mesa_get_format_block_size(gl_format format, GLuint *bw, GLuint *bh)
+{
+   const struct gl_format_info *info = _mesa_get_format_info(format);
+   *bw = info->BlockWidth;
+   *bh = info->BlockHeight;
+}
+
+
 /** Is the given format a compressed format? */
 GLboolean
 _mesa_is_format_compressed(gl_format format)

diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 72f1b1e..91ea023 100644 (file)
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -155,6 +155,9 @@ _mesa_get_format_datatype(gl_format format);
 extern GLenum
 _mesa_get_format_base_format(gl_format format);
 
+extern void
+_mesa_get_format_block_size(gl_format format, GLuint *bw, GLuint *bh);
+
 extern GLboolean
 _mesa_is_format_compressed(gl_format format);