softpipe: raise number of bits used for X coordinate texture lookup

With buffers the addressing is done on a per byte basis and we with
a maximal block size of 16 byte we have to take into acount four more
bits. For simplicity just remove the TEX_TILE_SIZE_LOG2, which is 5 bit.

Signed-off-by: Gert Wollny <[email protected]>
Reviewed-by: Dave Airlie <[email protected]>

2 files changed, 6 insertions, 7 deletions

diff --git a/src/gallium/drivers/softpipe/sp_tex_tile_cache.c b/src/gallium/drivers/softpipe/sp_tex_tile_cache.c
index 8fbc972aa85..e510ac58c06 100644
--- a/src/gallium/drivers/softpipe/sp_tex_tile_cache.c
+++ b/src/gallium/drivers/softpipe/sp_tex_tile_cache.c
@@ -50,7 +50,7 @@ sp_create_tex_tile_cache( struct pipe_context *pipe )
    uint pos;
 
    /* make sure max texture size works */
-   assert((TEX_TILE_SIZE << TEX_ADDR_BITS) >= (1 << (SP_MAX_TEXTURE_2D_LEVELS-1)));
+   assert((TEX_TILE_SIZE << TEX_Y_BITS) >= (1 << (SP_MAX_TEXTURE_2D_LEVELS-1)));
 
    tc = CALLOC_STRUCT( softpipe_tex_tile_cache );
    if (tc) {
diff --git a/src/gallium/drivers/softpipe/sp_tex_tile_cache.h b/src/gallium/drivers/softpipe/sp_tex_tile_cache.h
index b7ad222d715..2e4635f3811 100644
--- a/src/gallium/drivers/softpipe/sp_tex_tile_cache.h
+++ b/src/gallium/drivers/softpipe/sp_tex_tile_cache.h
@@ -43,18 +43,17 @@ struct softpipe_tex_tile_cache;
 #define TEX_TILE_SIZE_LOG2 5
 #define TEX_TILE_SIZE (1 << TEX_TILE_SIZE_LOG2)
 
-
-#define TEX_ADDR_BITS (SP_MAX_TEXTURE_2D_LEVELS - 1 - TEX_TILE_SIZE_LOG2)
-#define TEX_Z_BITS (SP_MAX_TEXTURE_2D_LEVELS - 1)
+#define TEX_ADDR_BITS (SP_MAX_TEXTURE_2D_LEVELS - 1)
+#define TEX_Y_BITS (SP_MAX_TEXTURE_2D_LEVELS - 1 - TEX_TILE_SIZE_LOG2)
 
 /**
  * Texture tile address as a union for fast compares.
  */
 union tex_tile_address {
    struct {
-      unsigned x:TEX_ADDR_BITS;  /* 16K / TILE_SIZE */
-      unsigned y:TEX_ADDR_BITS;  /* 16K / TILE_SIZE */
-      unsigned z:TEX_Z_BITS;     /* 16K -- z not tiled */
+      unsigned x:TEX_ADDR_BITS;  /* 16K -- need extra bits for texture buffers */
+      unsigned y:TEX_Y_BITS;  /* 16K / TILE_SIZE */
+      unsigned z:TEX_ADDR_BITS;  /* 16K -- z not tiled */
       unsigned level:4;
       unsigned invalid:1;
    } bits;