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pipeline: Avoid costly checking of lighting properties

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During _cogl_pipeline_needs_blending_enabled we were always checking the
current lighting properties (ambient,diffuse,specular,emission) which
had a notable impact during micro-benchmarks that exercise journal
throughput of simple colored rectangles. This #if 0's the offending code
considering that Cogl doesn't actually support lighting currently and
when it actually does then we will be able to optimize this by avoiding
the checks when lighting is disabled.
This commit is contained in:
Robert Bragg 2010-11-01 20:33:20 +00:00
parent e5eff5fc89
commit b41bf9e67f
1 changed files with 24 additions and 18 deletions
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24
cogl/cogl-pipeline.c
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@ -864,9 +864,6 @@ _cogl_pipeline_needs_blending_enabled (CoglPipeline *pipeline,
if (changes & COGL_PIPELINE_STATE_LAYERS) if (changes & COGL_PIPELINE_STATE_LAYERS)
changes = COGL_PIPELINE_STATE_AFFECTS_BLENDING; changes = COGL_PIPELINE_STATE_AFFECTS_BLENDING;
/* XXX: we don't currently handle specific changes in an optimal way*/
changes = COGL_PIPELINE_STATE_AFFECTS_BLENDING;
if ((override_color && cogl_color_get_alpha_byte (override_color) != 0xff)) if ((override_color && cogl_color_get_alpha_byte (override_color) != 0xff))
return TRUE; return TRUE;
@ -878,13 +875,13 @@ _cogl_pipeline_needs_blending_enabled (CoglPipeline *pipeline,
return TRUE; return TRUE;
} }
if (changes & COGL_PIPELINE_STATE_USER_SHADER)
{
/* We can't make any assumptions about the alpha channel if the user /* We can't make any assumptions about the alpha channel if the user
* is using an unknown fragment shader. * is using an unknown fragment shader.
* *
* TODO: check that it isn't just a vertex shader! * TODO: check that it isn't just a vertex shader!
*/ */
if (changes & COGL_PIPELINE_STATE_USER_SHADER)
{
if (_cogl_pipeline_get_user_program (pipeline) != COGL_INVALID_HANDLE) if (_cogl_pipeline_get_user_program (pipeline) != COGL_INVALID_HANDLE)
return TRUE; return TRUE;
} }
@ -893,8 +890,13 @@ _cogl_pipeline_needs_blending_enabled (CoglPipeline *pipeline,
*/ */
if (changes & COGL_PIPELINE_STATE_LIGHTING) if (changes & COGL_PIPELINE_STATE_LIGHTING)
{ {
/* XXX: This stuff is showing up in sysprof reports which is
* silly because lighting isn't currently actually supported
* by Cogl except for these token properties. When we actually
* expose lighting support we can avoid these checks when
* lighting is disabled. */
#if 0
CoglColor tmp; CoglColor tmp;
cogl_pipeline_get_ambient (pipeline, &tmp); cogl_pipeline_get_ambient (pipeline, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff) if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE; return TRUE;
@ -907,6 +909,7 @@ _cogl_pipeline_needs_blending_enabled (CoglPipeline *pipeline,
cogl_pipeline_get_emission (pipeline, &tmp); cogl_pipeline_get_emission (pipeline, &tmp);
if (cogl_color_get_alpha_byte (&tmp) != 0xff) if (cogl_color_get_alpha_byte (&tmp) != 0xff)
return TRUE; return TRUE;
#endif
} }
if (changes & COGL_PIPELINE_STATE_LAYERS) if (changes & COGL_PIPELINE_STATE_LAYERS)
@ -921,15 +924,18 @@ _cogl_pipeline_needs_blending_enabled (CoglPipeline *pipeline,
if (has_alpha) if (has_alpha)
return TRUE; return TRUE;
} }
else
/* So far we have only checked the property that has been changed so {
* we now need to check all the other properties too. */ /* In this case we have so far only checked the property that
* has been changed so we now need to check all the other
* properties too. */
other_state = COGL_PIPELINE_STATE_AFFECTS_BLENDING & ~changes; other_state = COGL_PIPELINE_STATE_AFFECTS_BLENDING & ~changes;
if (other_state && if (other_state &&
_cogl_pipeline_needs_blending_enabled (pipeline, _cogl_pipeline_needs_blending_enabled (pipeline,
other_state, other_state,
NULL)) NULL))
return TRUE; return TRUE;
}
return FALSE; return FALSE;
} }