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intel/pixel_read: Properly flip the results for window system buffers

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Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=88841

Reviewed-by: Chad Versace <chad.versace@intel.com>
This commit is contained in:
Jason Ekstrand 2015-01-28 03:31:06 -08:00
parent 837a4c42a6
commit 5c31184cf5
1 changed files with 15 additions and 0 deletions
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15
src/mesa/drivers/dri/i965/intel_pixel_read.c
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@ -155,6 +155,21 @@ intel_readpixels_tiled_memcpy(struct gl_context * ctx,
dst_pitch = _mesa_image_row_stride(pack, width, format, type);
/* For a window-system renderbuffer, the buffer is actually flipped
* vertically, so we need to handle that. Since the detiling function
* can only really work in the forwards direction, we have to be a
* little creative. First, we compute the Y-offset of the first row of
* the renderbuffer (in renderbuffer coordinates). We then match that
* with the last row of the client's data. Finally, we give
* tiled_to_linear a negative pitch so that it walks through the
* client's data backwards as it walks through the renderbufer forwards.
*/
if (rb->Name == 0) {
yoffset = rb->Height - yoffset - height;
pixels += (ptrdiff_t) (height - 1) * dst_pitch;
dst_pitch = -dst_pitch;
}
/* We postponed printing this message until having committed to executing
* the function.
*/