i965: change the meaning of cpp for compressed textures

An ASTC block takes up 16 bytes for all block width and height configurations.
This size is not integrally divisible by all ASTC block widths. Therefore cpp
is changed to mean bytes per block if the texture is compressed.

Because the original definition was bytes per block divided by block width, all
references to the mipmap width must be divided the block width. This keeps the
address calculation formulas consistent. For example, the units for miptree_level
x_offset and miptree total_width has changed from pixels to blocks.

v2: reuse preexisting ALIGN_NPOT macro located in an i965 driver file.
v3: move ALIGN_NPOT into seperate commit.
    simplify cpp assignment in copy_image_with_blitter().
    update miptree width and offset variables in: intel_miptree_copy_slice(),
        intel_miptree_map_gtt(), and brw_miptree_layout_texture_3d().

Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>
Signed-off-by: Nanley Chery <nanley.g.chery@intel.com>

4 files changed, 15 insertions, 35 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index e8a92dd..a95ac95 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -395,6 +395,7 @@ brw_miptree_layout_2d(struct intel_mipmap_tree *mt)
        }
    }
 
+   mt->total_width /= bw;
    mt->total_height = 0;
 
    for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
@@ -419,7 +420,7 @@ brw_miptree_layout_2d(struct intel_mipmap_tree *mt)
       /* Layout_below: step right after second mipmap.
        */
       if (level == mt->first_level + 1) {
-	 x += ALIGN_NPOT(width, mt->align_w);
+	 x += ALIGN_NPOT(width, mt->align_w) / bw;
       } else {
 	 y += img_height;
       }
@@ -579,12 +580,14 @@ static void
 brw_miptree_layout_texture_3d(struct brw_context *brw,
                               struct intel_mipmap_tree *mt)
 {
-   unsigned yscale = mt->compressed ? 4 : 1;
-
    mt->total_width = 0;
    mt->total_height = 0;
 
    unsigned ysum = 0;
+   unsigned bh, bw;
+
+   _mesa_get_format_block_size(mt->format, &bw, &bh);
+
    for (unsigned level = mt->first_level; level <= mt->last_level; level++) {
       unsigned WL = MAX2(mt->physical_width0 >> level, 1);
       unsigned HL = MAX2(mt->physical_height0 >> level, 1);
@@ -601,9 +604,9 @@ brw_miptree_layout_texture_3d(struct brw_context *brw,
          unsigned x = (q % (1 << level)) * wL;
          unsigned y = ysum + (q >> level) * hL;
 
-         intel_miptree_set_image_offset(mt, level, q, x, y / yscale);
-         mt->total_width = MAX2(mt->total_width, x + wL);
-         mt->total_height = MAX2(mt->total_height, (y + hL) / yscale);
+         intel_miptree_set_image_offset(mt, level, q, x / bw, y / bh);
+         mt->total_width = MAX2(mt->total_width, (x + wL) / bw);
+         mt->total_height = MAX2(mt->total_height, (y + hL) / bh);
       }
 
       ysum += ALIGN(DL, 1 << level) / (1 << level) * hL;
diff --git a/src/mesa/drivers/dri/i965/intel_copy_image.c b/src/mesa/drivers/dri/i965/intel_copy_image.c
index 3706704..ac2738f 100644
--- a/src/mesa/drivers/dri/i965/intel_copy_image.c
+++ b/src/mesa/drivers/dri/i965/intel_copy_image.c
@@ -41,7 +41,6 @@ copy_image_with_blitter(struct brw_context *brw,
 {
    GLuint bw, bh;
    uint32_t src_image_x, src_image_y, dst_image_x, dst_image_y;
-   int cpp;
 
    /* The blitter doesn't understand multisampling at all. */
    if (src_mt->num_samples > 0 || dst_mt->num_samples > 0)
@@ -86,16 +85,6 @@ copy_image_with_blitter(struct brw_context *brw,
       src_y /= (int)bh;
       src_width /= (int)bw;
       src_height /= (int)bh;
-
-      /* Inside of the miptree, the x offsets are stored in pixels while
-       * the y offsets are stored in blocks.  We need to scale just the x
-       * offset.
-       */
-      src_image_x /= bw;
-
-      cpp = _mesa_get_format_bytes(src_mt->format);
-   } else {
-      cpp = src_mt->cpp;
    }
    src_x += src_image_x;
    src_y += src_image_y;
@@ -111,18 +100,12 @@ copy_image_with_blitter(struct brw_context *brw,
 
       dst_x /= (int)bw;
       dst_y /= (int)bh;
-
-      /* Inside of the miptree, the x offsets are stored in pixels while
-       * the y offsets are stored in blocks.  We need to scale just the x
-       * offset.
-       */
-      dst_image_x /= bw;
    }
    dst_x += dst_image_x;
    dst_y += dst_image_y;
 
    return intelEmitCopyBlit(brw,
-                            cpp,
+                            src_mt->cpp,
                             src_mt->pitch,
                             src_mt->bo, src_mt->offset,
                             src_mt->tiling,
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 44eb913..0bcbbbc 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -313,15 +313,7 @@ intel_miptree_create_layout(struct brw_context *brw,
    mt->fast_clear_state = INTEL_FAST_CLEAR_STATE_NO_MCS;
    mt->disable_aux_buffers = (layout_flags & MIPTREE_LAYOUT_DISABLE_AUX) != 0;
    exec_list_make_empty(&mt->hiz_map);
-
-   /* The cpp is bytes per (1, blockheight)-sized block for compressed
-    * textures.  This is why you'll see divides by blockheight all over
-    */
-   unsigned bw, bh;
-   _mesa_get_format_block_size(format, &bw, &bh);
-   assert(_mesa_get_format_bytes(mt->format) % bw == 0);
-   mt->cpp = _mesa_get_format_bytes(mt->format) / bw;
-
+   mt->cpp = _mesa_get_format_bytes(format);
    mt->num_samples = num_samples;
    mt->compressed = _mesa_is_format_compressed(format);
    mt->msaa_layout = INTEL_MSAA_LAYOUT_NONE;
@@ -1273,7 +1265,7 @@ intel_miptree_copy_slice(struct brw_context *brw,
       unsigned int i, j;
       _mesa_get_format_block_size(dst_mt->format, &i, &j);
       height = ALIGN_NPOT(height, j) / j;
-      width = ALIGN_NPOT(width, i);
+      width = ALIGN_NPOT(width, i) / i;
    }
 
    /* If it's a packed depth/stencil buffer with separate stencil, the blit
@@ -2105,7 +2097,9 @@ intel_miptree_map_gtt(struct brw_context *brw,
     */
    _mesa_get_format_block_size(mt->format, &bw, &bh);
    assert(y % bh == 0);
+   assert(x % bw == 0);
    y /= bh;
+   x /= bw;
 
    base = intel_miptree_map_raw(brw, mt) + mt->offset;
 
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
index 790d312..c28162a 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.h
@@ -390,7 +390,7 @@ struct intel_mipmap_tree
     */
    GLuint physical_width0, physical_height0, physical_depth0;
 
-   GLuint cpp; /**< bytes per pixel */
+   GLuint cpp; /**< bytes per pixel (or bytes per block if compressed) */
    GLuint num_samples;
    bool compressed;