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arbfp: track which layers have combine constants

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We weren't actually tracking which layers have been allocated param
space for combine constants; all layers just had a default constant_id
of 0 that indexes into the program.local[] params array and a dirty flag
to say when the constant needs updating. There are times though when we
say to update everything by-passing the dirty flag and because we
weren't actually tracking which layers needed constants we would always
write a constant to program.local[0] for every layer. The upshot was
that we could end up clobbering a real constant that was actually
allocated the constant_id = 0 slot.

This patch adds a new UnitState bitfield to track if the layer has a
corresponding constant that may need flushing and we only ever write the
constant with glProgramLocalParameter4fv if that's set.

https://bugzilla.gnome.org/show_bug.cgi?id=658092

Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg 2011-09-08 23:08:43 +01:00
parent 5888e0c65f
commit b6cea6bed6
1 changed files with 4 additions and 1 deletions
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5
cogl/cogl-pipeline-fragend-arbfp.c
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@ -61,6 +61,7 @@ typedef struct _UnitState
{
int constant_id; /* The program.local[] index */
unsigned int dirty_combine_constant:1;
unsigned int has_combine_constant:1;
unsigned int sampled:1;
} UnitState;
@ -404,6 +405,7 @@ setup_arg (CoglPipeline *pipeline,
UnitState *unit_state = &shader_state->unit_state[unit_index];
unit_state->constant_id = shader_state->next_constant_id++;
unit_state->has_combine_constant = TRUE;
unit_state->dirty_combine_constant = TRUE;
arg->type = COGL_PIPELINE_FRAGEND_ARBFP_ARG_TYPE_CONSTANT;
@ -786,7 +788,8 @@ update_constants_cb (CoglPipeline *pipeline,
_COGL_GET_CONTEXT (ctx, FALSE);
if (state->update_all || unit_state->dirty_combine_constant)
if (unit_state->has_combine_constant &&
(state->update_all || unit_state->dirty_combine_constant))
{
float constant[4];
_cogl_pipeline_get_layer_combine_constant (pipeline,