i965: Export format comparison for blitting between miptrees

Since the introduction of

commit 536003c11e4cb1172c540932ce3cce06f03bf44e
Author: Boyan Ding <boyan.j.ding@gmail.com>
Date:   Wed Mar 25 19:36:54 2015 +0800

    i965: Add XRGB8888 format to intel_screen_make_configs

winsys buffers no longer have an alpha channel. This causes
_mesa_format_matches_format_and_type() to reject previously working BGRA
uploads from using the BLT fast path. Instead of using the generic
routine for matching formats exactly, export the slightly more relaxed
check from intel_miptree_blit() which importantly allows the blitter
routine to apply a small number of format conversions.

References: https://bugs.freedesktop.org/show_bug.cgi?id=90839
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Alexander Monakov <amonakov@gmail.com>
Cc: Kristian Høgsberg <krh@bitplanet.net>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Cc: mesa-stable@lists.freedesktop.org

1 files changed, 9 insertions, 2 deletions

diff --git a/src/mesa/drivers/dri/i965/intel_pixel_draw.c b/src/mesa/drivers/dri/i965/intel_pixel_draw.c
index 4ecefc8..d68cbb6 100644
--- a/src/mesa/drivers/dri/i965/intel_pixel_draw.c
+++ b/src/mesa/drivers/dri/i965/intel_pixel_draw.c
@@ -28,6 +28,7 @@
 #include "main/glheader.h"
 #include "main/enums.h"
 #include "main/image.h"
+#include "main/glformats.h"
 #include "main/mtypes.h"
 #include "main/condrender.h"
 #include "main/fbobject.h"
@@ -76,8 +77,14 @@ do_blit_drawpixels(struct gl_context * ctx,
    struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
    struct intel_renderbuffer *irb = intel_renderbuffer(rb);
 
-   if (!_mesa_format_matches_format_and_type(irb->mt->format, format, type,
-                                             false)) {
+   mesa_format src_format = _mesa_format_from_format_and_type(format, type);
+   mesa_format dst_format = irb->mt->format;
+
+   /* We can safely discard sRGB encode/decode for the DrawPixels interface */
+   src_format = _mesa_get_srgb_format_linear(src_format);
+   dst_format = _mesa_get_srgb_format_linear(dst_format);
+
+   if (!intel_miptree_blit_compatible_formats(src_format, dst_format)) {
       DBG("%s: bad format for blit\n", __func__);
       return false;
    }