lib/igt_vc4: Add helpers for converting linear to T-tiled RGB buffers

In order to integrate testing of T-tiled buffers, the easiest path is to
generate patterns (with the already-existing functions) in linear
buffers and convert them to T-tiled subsequently.

Add helpers to do that conversion, with a first helper that returns the
memory offset for a given position in a T-tiled buffer and a second
helper that uses it for converting between framebuffers.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Maxime Ripard <maxime.ripard@bootlin.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/igt_vc4.h b/lib/igt_vc4.h
index ebc8a388..d5c529bb 100644
--- a/lib/igt_vc4.h
+++ b/lib/igt_vc4.h
@@ -33,4 +33,8 @@ bool igt_vc4_purgeable_bo(int fd, int handle, bool purgeable);
 void igt_vc4_set_tiling(int fd, uint32_t handle, uint64_t modifier);
 uint64_t igt_vc4_get_tiling(int fd, uint32_t handle);
 
+unsigned int igt_vc4_fb_t_tiled_convert(struct igt_fb *dst, struct igt_fb *src);
+size_t igt_vc4_t_tiled_offset(size_t stride, size_t height, size_t bpp,
+			      size_t x, size_t y);
+
 #endif /* IGT_VC4_H */