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pipeline: Clarify stages for finding an arbfp program

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In the arbfp backend there is a seqential approach to finding a suitable
arbfp program to use for a given pipeline; first we see if there's
already a program associated with the pipeline, 2nd we try and find a
program associated with the "arbfp-authority" 3rd we try and lookup a
program in a cache and finally we resort to starting code-generation for
a new program. This patch slightly reworks the code of these steps to
hopefully make them a bit clearer.
This commit is contained in:
Robert Bragg 2010-12-08 16:23:10 +00:00
parent 9606c42c55
commit bac600b21b
1 changed files with 62 additions and 44 deletions
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106
clutter/cogl/cogl/cogl-pipeline-arbfp.c
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@ -214,6 +214,7 @@ _cogl_pipeline_backend_arbfp_start (CoglPipeline *pipeline,
CoglPipelineBackendARBfpPrivate *priv;
CoglPipeline *authority;
CoglPipelineBackendARBfpPrivate *authority_priv;
ArbfpProgramState *arbfp_program_state;
CoglHandle user_program;
_COGL_GET_CONTEXT (ctx, FALSE);
@ -257,6 +258,17 @@ _cogl_pipeline_backend_arbfp_start (CoglPipeline *pipeline,
*/
authority = _cogl_pipeline_find_codegen_authority (pipeline, user_program);
authority_priv = get_arbfp_priv (authority);
if (authority_priv &&
authority_priv->arbfp_program_state)
{
/* If we are going to share our program state with an arbfp-authority
* then steal a reference to the program state associated with that
* arbfp-authority... */
priv->arbfp_program_state =
arbfp_program_state_ref (authority_priv->arbfp_program_state);
return TRUE;
}
if (!authority_priv)
{
authority_priv = g_slice_new0 (CoglPipelineBackendARBfpPrivate);
@ -266,56 +278,62 @@ _cogl_pipeline_backend_arbfp_start (CoglPipeline *pipeline,
/* If we haven't yet found an existing program then before we resort to
* generating a new arbfp program we see if we can find a suitable
* program in the arbfp_cache. */
if (!authority_priv->arbfp_program_state &&
G_LIKELY (!(cogl_debug_flags & COGL_DEBUG_DISABLE_PROGRAM_CACHES)))
if (G_LIKELY (!(cogl_debug_flags & COGL_DEBUG_DISABLE_PROGRAM_CACHES)))
{
authority_priv->arbfp_program_state =
g_hash_table_lookup (ctx->arbfp_cache, authority);
if (authority_priv->arbfp_program_state)
arbfp_program_state_ref (authority_priv->arbfp_program_state);
}
if (!authority_priv->arbfp_program_state)
{
ArbfpProgramState *arbfp_program_state =
arbfp_program_state_new (n_layers);
authority_priv->arbfp_program_state = arbfp_program_state;
/* If we don't have an existing program associated with the
* arbfp-authority then start generating code for a new program...
*/
arbfp_program_state->user_program = user_program;
if (user_program == COGL_INVALID_HANDLE)
arbfp_program_state = g_hash_table_lookup (ctx->arbfp_cache, authority);
if (arbfp_program_state)
{
int i;
priv->arbfp_program_state =
arbfp_program_state_ref (arbfp_program_state);
/* We reuse a single grow-only GString for code-gen */
g_string_set_size (ctx->fragment_source_buffer, 0);
arbfp_program_state->source = ctx->fragment_source_buffer;
g_string_append (arbfp_program_state->source,
"!!ARBfp1.0\n"
"TEMP output;\n"
"TEMP tmp0, tmp1, tmp2, tmp3, tmp4;\n"
"PARAM half = {.5, .5, .5, .5};\n"
"PARAM one = {1, 1, 1, 1};\n"
"PARAM two = {2, 2, 2, 2};\n"
"PARAM minus_one = {-1, -1, -1, -1};\n");
for (i = 0; i < n_layers; i++)
{
arbfp_program_state->unit_state[i].sampled = FALSE;
arbfp_program_state->unit_state[i].dirty_combine_constant = FALSE;
}
arbfp_program_state->next_constant_id = 0;
/* Since we have already resolved the arbfp-authority at this point
* we might as well also associate any program we find from the cache
* with the authority too... */
if (authority_priv != priv)
authority_priv->arbfp_program_state =
arbfp_program_state_ref (arbfp_program_state);
return TRUE;
}
}
/* Finally, if the pipeline isn't actually its own arbfp-authority
* then steal a reference to the program state associated with the
* arbfp-authority... */
if (authority != pipeline)
priv->arbfp_program_state =
arbfp_program_state_ref (authority_priv->arbfp_program_state);
/* If we still haven't found an existing program then start
* generating code for a new program...
*/
arbfp_program_state = arbfp_program_state_new (n_layers);
priv->arbfp_program_state = arbfp_program_state_ref (arbfp_program_state);
/* Since we have already resolved the arbfp-authority at this point we might
* as well also associate any program we generate with the authority too...
*/
if (authority_priv != priv)
authority_priv->arbfp_program_state =
arbfp_program_state_ref (arbfp_program_state);
arbfp_program_state->user_program = user_program;
if (user_program == COGL_INVALID_HANDLE)
{
int i;
/* We reuse a single grow-only GString for code-gen */
g_string_set_size (ctx->fragment_source_buffer, 0);
arbfp_program_state->source = ctx->fragment_source_buffer;
g_string_append (arbfp_program_state->source,
"!!ARBfp1.0\n"
"TEMP output;\n"
"TEMP tmp0, tmp1, tmp2, tmp3, tmp4;\n"
"PARAM half = {.5, .5, .5, .5};\n"
"PARAM one = {1, 1, 1, 1};\n"
"PARAM two = {2, 2, 2, 2};\n"
"PARAM minus_one = {-1, -1, -1, -1};\n");
for (i = 0; i < n_layers; i++)
{
arbfp_program_state->unit_state[i].sampled = FALSE;
arbfp_program_state->unit_state[i].dirty_combine_constant = FALSE;
}
}
return TRUE;
}