mesa: Extract computation of compressed pixel store params

This logic is reusable across CompressedTex*Image* and
GetCompressedTexImage; the strides calculated will also be needed
in the PBO validation functions to ensure that the referenced range of
bytes is valid.

Signed-off-by: Chris Forbes <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/mesa/main/texstore.h b/src/mesa/main/texstore.h
index 490f9f5e08c..c4cfffde677 100644
--- a/src/mesa/main/texstore.h
+++ b/src/mesa/main/texstore.h
@@ -132,4 +132,21 @@ _mesa_store_compressed_texsubimage(struct gl_context *ctx, GLuint dims,
                                    GLsizei imageSize, const GLvoid *data);
 
 
+struct compressed_pixelstore {
+   int SkipBytes;
+   int CopyBytesPerRow;
+   int CopyRowsPerSlice;
+   int TotalBytesPerRow;
+   int TotalRowsPerSlice;
+   int CopySlices;
+};
+
+
+extern void
+_mesa_compute_compressed_pixelstore(GLuint dims, struct gl_texture_image *texImage,
+                              GLsizei width, GLsizei height, GLsizei depth,
+                              const struct gl_pixelstore_attrib *packing,
+                              struct compressed_pixelstore *store);
+
+
 #endif