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pipeline: Add a snippet hook for the texture lookup

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This adds a per-layer snippet hook for the texure lookup. Here the
snippet can modify the texture coordinates used for the lookup or
modify the texel resulting from the lookup. This is the first
per-layer hook so this also adds the
COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS state and all of the
boilerplate needed to make that work.

Most of the functions used by the pipeline state to manage the snippet
list has been moved into cogl-pipeline-snippet.c so that it can be
shared with the layer state.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
This commit is contained in:
Neil Roberts
2011-11-25 17:36:03 +00:00
committed by Robert Bragg
parent 4cdf66f89b
commit df0f9a862f
11 changed files with 420 additions and 148 deletions
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71
cogl/cogl-pipeline-layer-state.c
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@ -774,6 +774,58 @@ cogl_pipeline_get_layer_point_sprite_coords_enabled (CoglPipeline *pipeline,
return authority->big_state->point_sprite_coords;
}
static void
_cogl_pipeline_layer_add_fragment_snippet (CoglPipeline *pipeline,
int layer_index,
CoglPipelineSnippetHook hook,
CoglSnippet *snippet)
{
CoglPipelineLayerState change = COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS;
CoglPipelineLayer *layer, *authority;
_COGL_RETURN_IF_FAIL (cogl_is_pipeline (pipeline));
/* Note: this will ensure that the layer exists, creating one if it
* doesn't already.
*
* Note: If the layer already existed it's possibly owned by another
* pipeline. If the layer is created then it will be owned by
* pipeline. */
layer = _cogl_pipeline_get_layer (pipeline, layer_index);
/* Now find the ancestor of the layer that is the authority for the
* state we want to change */
authority = _cogl_pipeline_layer_get_authority (layer, change);
layer = _cogl_pipeline_layer_pre_change_notify (pipeline, layer, change);
_cogl_pipeline_snippet_list_add (&layer->big_state->fragment_snippets,
hook,
snippet);
/* If we weren't previously the authority on this state then we need
* to extended our differences mask and so it's possible that some
* of our ancestry will now become redundant, so we aim to reparent
* ourselves if that's true... */
if (layer != authority)
{
layer->differences |= change;
_cogl_pipeline_layer_prune_redundant_ancestry (layer);
}
}
void
cogl_pipeline_add_texture_lookup_hook (CoglPipeline *pipeline,
int layer_index,
CoglSnippet *snippet)
{
CoglPipelineSnippetHook hook = COGL_PIPELINE_SNIPPET_HOOK_TEXTURE_LOOKUP;
_cogl_pipeline_layer_add_fragment_snippet (pipeline,
layer_index,
hook,
snippet);
}
gboolean
_cogl_pipeline_layer_texture_target_equal (CoglPipelineLayer *authority0,
CoglPipelineLayer *authority1,
@ -911,6 +963,16 @@ _cogl_pipeline_layer_point_sprite_coords_equal (CoglPipelineLayer *authority0,
return big_state0->point_sprite_coords == big_state1->point_sprite_coords;
}
gboolean
_cogl_pipeline_layer_fragment_snippets_equal (CoglPipelineLayer *authority0,
CoglPipelineLayer *authority1)
{
return _cogl_pipeline_snippet_list_equal (&authority0->big_state->
fragment_snippets,
&authority1->big_state->
fragment_snippets);
}
static void
setup_texture_combine_state (CoglBlendStringStatement *statement,
CoglPipelineCombineFunc *texture_combine_func,
@ -1664,4 +1726,11 @@ _cogl_pipeline_layer_hash_point_sprite_state (CoglPipelineLayer *authority,
sizeof (big_state->point_sprite_coords));
}
void
_cogl_pipeline_layer_hash_fragment_snippets_state (CoglPipelineLayer *authority,
CoglPipelineLayer **authorities,
CoglPipelineHashState *state)
{
_cogl_pipeline_snippet_list_hash (&authority->big_state->fragment_snippets,
&state->hash);
}