[Mesa-dev] [Bug 92758] Fixed function programs generated multiple times per draw call

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=92758

GitLab Migration User  changed:

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 Status|NEW |RESOLVED

--- Comment #1 from GitLab Migration User  ---
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This bug has been migrated to freedesktop.org's GitLab instance and has been
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[Mesa-dev] [Bug 92758] Fixed function programs generated multiple times per draw call

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=92758

Bug ID: 92758
   Summary: Fixed function programs generated multiple times per
draw call
   Product: Mesa
   Version: git
  Hardware: Other
OS: All
Status: NEW
  Severity: normal
  Priority: medium
 Component: Mesa core
  Assignee: mesa-dev@lists.freedesktop.org
  Reporter: imir...@alum.mit.edu
QA Contact: mesa-dev@lists.freedesktop.org

Created attachment 119318
  --> https://bugs.freedesktop.org/attachment.cgi?id=119318=edit
trace that demonstrates 2 FS and 2 VS programs generated in a single draw call

FF programs are affected by various state. It seems it's possible to do things
"just right" to cause them to be regenerated twice in a single draw. The
attached trace produces the following for me:

48: message: shader compiler issue 1: type: 1,
48: message: shader compiler issue 1: type: 0,
53: message: shader compiler issue 1: type: 1,
53: message: shader compiler issue 1: type: 0,
172: message: shader compiler issue 1: type: 1,
172: message: shader compiler issue 1: type: 0,
172: message: shader compiler issue 1: type: 1,
172: message: shader compiler issue 1: type: 0,
275: message: shader compiler issue 1: type: 1,
275: message: shader compiler issue 1: type: 0,
275: message: shader compiler issue 1: type: 0,
2172: message: shader compiler issue 1: type: 1
2172: message: shader compiler issue 1: type: 0
2172: message: shader compiler issue 1: type: 0
2239: message: shader compiler issue 1: type: 1
2239: message: shader compiler issue 1: type: 0
2328: message: shader compiler issue 1: type: 1
2328: message: shader compiler issue 1: type: 0
2328: message: shader compiler issue 1: type: 1
2328: message: shader compiler issue 1: type: 0

Type 0/1 are VS and FS (id corresponds to PIPE_SHADER_*). Note that the draw
calls at 172 and 2328 both generate 2 programs each, while draw calls 275 and
2172 generate 2 programs for one of the types.

One set is generated via the path

vbo_exec_DrawRangeElementsBaseVertex -> validate_DrawElements_common ->
check_valid_to_render -> _mesa_valid_to_render -> _mesa_update_state ->
update_program

while the second is generated via

vbo_exec_DrawRangeElementsBaseVertex -> vbo_validated_drawrangeelements ->
vbo_bind_arrays -> _mesa_update_state -> update_program.

I guess in between the _NEW_PROGRAM bit manages to set itself.

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[Mesa-dev] [Bug 92758] Fixed function programs generated multiple times per draw call

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=92758

Ilia Mirkin  changed:

   What|Removed |Added

 Attachment #119318|text/plain  |application/octet-stream
  mime type||

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