freedreno/a3xx: fix texture buffers, enable offsets

The main issue is that the current logic looked into cso->u.tex, which
is the wrong side of the union to look into for texture buffers. While I
was at it, it was easy enough to add the logic to handle offsets
(first_element).

 - reduce texture buffer size limit (determined experimentally)
 - don't look at first/last levels, instead look at first/last element
 - include the first element offset
 - set offset alignment to 16 (determined experimentally)

Signed-off-by: Ilia Mirkin <[email protected]>
Signed-off-by: Rob Clark <[email protected]>

1 files changed, 4 insertions, 5 deletions

diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 1e124592a80..8440e594308 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -180,16 +180,15 @@ fd_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
 		return is_a3xx(screen) || is_a4xx(screen);
 
 	case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
-		/* ignoring first/last_element.. but I guess that should be
-		 * easy to add..
-		 */
-		return 0;
+		return is_a3xx(screen) ? 16 : 0;
 	case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 		/* I think 32k on a4xx.. and we could possibly emulate more
 		 * by pretending 2d/rect textures and splitting high bits
 		 * of index into 2nd dimension..
 		 */
-		return 16383;
+		if (is_a3xx(screen)) return 8192;
+		if (is_a4xx(screen)) return 16383;
+		return 0;
 
 	case PIPE_CAP_DEPTH_CLIP_DISABLE:
 	case PIPE_CAP_CLIP_HALFZ: