i915g: postpone mipmap/face offset calculation

libdrm-intel can refuse to tile buffers for various reasons. For
potentially tiled buffers the stride is therefore only known after
the iws->buffer_create_tiled call. Unconditionally rounding up to whatever
tiling requires wastes space, so rework the code to not use tex->stride
in the layout code.

Luckily only the mimap/face offset calculation uses it which can easily
be solved by storing an (x, y) coordinate pair. Furthermore this will
be usefull later for properly supporting rendering into the different
levels of tiled mipmap textures.

v2: switch to nblocks(x|y): More in line with gallium and better
suited for rendering into mipmap textures.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Jakob Bornecrantz <wallbraker@gmail.com>
Signed-off-by: Jakob Bornecrantz <wallbraker@gmail.com>

1 files changed, 25 insertions, 17 deletions

diff --git a/src/gallium/drivers/i915/i915_resource_texture.c b/src/gallium/drivers/i915/i915_resource_texture.c
index ae34477ec2..6ff6ac7ad8 100644
--- a/src/gallium/drivers/i915/i915_resource_texture.c
+++ b/src/gallium/drivers/i915/i915_resource_texture.c
@@ -120,25 +120,37 @@ i915_texture_set_level_info(struct i915_texture *tex,
    assert(!tex->image_offset[level]);
 
    tex->nr_images[level] = nr_images;
-   tex->image_offset[level] = (unsigned *) MALLOC(nr_images * sizeof(unsigned));
-   tex->image_offset[level][0] = 0;
+   tex->image_offset[level] = MALLOC(nr_images * sizeof(struct offset_pair));
+   tex->image_offset[level][0].nblocksx = 0;
+   tex->image_offset[level][0].nblocksy = 0;
+}
+
+inline unsigned i915_texture_offset(struct i915_texture *tex,
+			            unsigned level, unsigned face)
+{
+	unsigned x, y;
+	x = tex->image_offset[level][face].nblocksx
+               * util_format_get_blocksize(tex->b.b.format);
+	y = tex->image_offset[level][face].nblocksy;
+
+	return y * tex->stride + x;
 }
 
 static void
 i915_texture_set_image_offset(struct i915_texture *tex,
                               unsigned level, unsigned img,
-                              unsigned x, unsigned y)
+                              unsigned nblocksx, unsigned nblocksy)
 {
    /* for the first image and level make sure offset is zero */
-   assert(!(img == 0 && level == 0) || (x == 0 && y == 0));
+   assert(!(img == 0 && level == 0) || (nblocksx == 0 && nblocksy == 0));
    assert(img < tex->nr_images[level]);
 
-   tex->image_offset[level][img] = y * tex->stride + x * util_format_get_blocksize(tex->b.b.format);
+   tex->image_offset[level][img].nblocksx = nblocksx;
+   tex->image_offset[level][img].nblocksy = nblocksy;
 
 #if DEBUG_TEXTURES
-   debug_printf("%s: %p level %u, img %u (%u, %u) %p\n", __FUNCTION__,
-                tex, level, img, x, y,
-                (void*)(uintptr_t)tex->image_offset[level][img]);
+   debug_printf("%s: %p level %u, img %u (%u, %u)\n", __FUNCTION__,
+                tex, level, img, x, y);
 #endif
 }
 
@@ -686,7 +698,6 @@ i915_texture_get_transfer(struct pipe_context *context,
    return transfer;
 }
 
-
 static void *
 i915_texture_transfer_map(struct pipe_context *pipe,
 			  struct pipe_transfer *transfer)
@@ -701,11 +712,11 @@ i915_texture_transfer_map(struct pipe_context *pipe,
    char *map;
 
    if (resource->target == PIPE_TEXTURE_CUBE) {
-      offset = tex->image_offset[sr.level][sr.face];
+      offset = i915_texture_offset(tex, sr.level, sr.face);
    } else if (resource->target == PIPE_TEXTURE_3D) {
-      offset = tex->image_offset[sr.level][box->z];
+      offset = i915_texture_offset(tex, sr.level, box->z);
    } else {
-      offset = tex->image_offset[sr.level][0];
+      offset = i915_texture_offset(tex, sr.level, 0);
       assert(sr.face == 0);
       assert(box->z == 0);
    }
@@ -754,7 +765,6 @@ i915_texture_create(struct pipe_screen *screen,
    struct i915_screen *is = i915_screen(screen);
    struct i915_winsys *iws = is->iws;
    struct i915_texture *tex = CALLOC_STRUCT(i915_texture);
-   size_t tex_size;
    unsigned buf_usage = 0;
 
    if (!tex)
@@ -773,8 +783,6 @@ i915_texture_create(struct pipe_screen *screen,
          goto fail;
    }
 
-   tex_size = tex->stride * tex->total_nblocksy;
-
    /* for scanouts and cursors, cursors arn't scanouts */
 
    /* XXX: use a custom flag for cursors, don't rely on magically
@@ -790,8 +798,8 @@ i915_texture_create(struct pipe_screen *screen,
    if (!tex->buffer)
       goto fail;
 
-   I915_DBG(DBG_TEXTURE, "%s: %p size %u, stride %u, blocks (%u, %u)\n", __func__,
-            tex, (unsigned int)tex_size, tex->stride,
+   I915_DBG(DBG_TEXTURE, "%s: %p stride %u, blocks (%u, %u)\n", __func__,
+            tex, tex->stride,
             tex->stride / util_format_get_blocksize(tex->b.b.format),
             tex->total_nblocksy);