Bug 10788

Summary:	GL_ARB_fragment_program implement incorrect about state of fragment.fogcoord
Product:	Mesa	Reporter:	WuNian <nian.wu>
Component:	Drivers/DRI/i915	Assignee:	haihao <haihao.xiang>
Status:	VERIFIED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	mesa-dev, wei.z.wang
Version:	git
Hardware:	Other
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	16195
Attachments:	test case

Description WuNian 2007-04-27 23:10:39 UTC

In extension GL_ARB_fragment_program, the components value of fragment.fogcoord are (f, 0, 0, 1), but Mesa assign the components value as (f, f, f, f).

For example:
Call glProgramStringARB with program string:
"!!ARBfp1.0\nATTRIB state_param = fragment.fogcoord;\nMOV result.color, state_param;\n\nEND";
and set the fog coord as 0.6, then draw a quads, the pixel color should be (0.6, 0, 0, 1) instead of (0.6, 0.6, 0.6, 0.6);

Comment 1 WuNian 2007-04-27 23:11:17 UTC

Created attachment 9763 [details]
test case

Comment 2 Brian Paul 2007-04-28 07:51:34 UTC

Fixed in git.

Comment 3 WuNian 2007-07-02 22:20:58 UTC

Today I wanted to verify this bug, but it still exists. Reopen it.

Comment 4 Brian Paul 2007-07-03 07:18:57 UTC

Which driver are you using?  It works with software rendering here.

Comment 5 WuNian 2007-07-03 18:15:11 UTC

Xlib driver is OK. I use 915 and 965 driver. So change the component to DRI/I915.

Comment 6 haihao 2008-02-15 00:09:23 UTC

fixed in mesa 7eef52e975e852207ee840c74cd822c8f8c90a01 (i915), 83068115e2104b1880431ada96fa37e632149a86 (i965)

Comment 7 WuNian 2008-02-17 18:50:15 UTC

I got pixel color (0, 0, 0, 1) when I ran the test case with i915/i965 driver and softrendering(set LIBGL_ALWAYS_INDIRECT=1).
Please recheck, thanks.

Comment 8 haihao 2008-02-17 19:38:47 UTC

(In reply to comment #7)
> I got pixel color (0, 0, 0, 1) when I ran the test case with i915/i965 driver
> and softrendering(set LIBGL_ALWAYS_INDIRECT=1).
> Please recheck, thanks.
> 

test case issue.

please add the following line in your case.
#define GL_GLEXT_PROTOTYPES 

or glFogCoordf is implicitly declared.

Comment 9 WuNian 2008-02-17 21:01:55 UTC

Yes, case issue. 
Thanks for your hint.

Comment 10 Adam Jackson 2009-08-24 12:26:40 UTC

Mass version move, cvs -> git

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