http://bugs.freedesktop.org/show_bug.cgi?id=14313
Summary: [i915 PBO TTM] read pixels through PBO not working when
pixel alignment is 1
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/DRI/i915
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: dri-devel@lists.sourceforge.net
Created an attachment (id=14048)
--> (http://bugs.freedesktop.org/attachment.cgi?id=14048)
test case
System Environment:
--------------------------
Platform: 945gm 915gm 915gv 945g
drm
commit c6f175cbea1dba3fc26426243acc55b89b8a8064
mesa
commit 02d5ba849197e19843dad164239b51f18fb16faf
xf86_video_intel
commit 633dbd28218fd8a746c1735fd44a14f35bd07faa
Bug detailed description:
--------------------------
this issue only happen when pixel alignment is 1, in GL_BGRA format, and
GL_UNSIGNED_BYTE
reading 8x8 pixels back through PBO(pixel alignment is 1, in GL_BGRA format,
GL_UNSIGNED_BYTE) does not return expected result. seems following patch fix
this, but glean test case readpixPerf still fails(it get 1000x1000 pixels
back):
diff --git a/configs/linux-dri b/configs/linux-dri
diff --git a/src/mesa/drivers/dri/i915/intel_pixel_read.c
b/src/mesa/drivers/dri/i915/intel_pixel_read.c
index 2e31656..0b80309 100644
--- a/src/mesa/drivers/dri/i915/intel_pixel_read.c
+++ b/src/mesa/drivers/dri/i915/intel_pixel_read.c
@@ -222,9 +222,6 @@ do_blit_readpixels(GLcontext * ctx,
_mesa_printf("%s: MESA_PACK_INVERT not done yet\n", __FUNCTION__);
return GL_FALSE;
}
- else {
- rowLength = -rowLength;
- }
/* XXX 64-bit cast? */
dst_offset = (GLuint) _mesa_image_address(2, pack, pixels, width, height,
Reproduce steps:
----------------
start X
compile & run attach test case, or
run glean -r log -t +readpixPerf
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