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cogl-pipeline-glsl: Fix reusing shaders for shared ancestors

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The check for whether we can reuse a program we've already generated
was only being done if the pipeline already had a
glsl_program_state. When there is no glsl_program_state it then looks
for the nearest ancestor it can share the program with. It then
wasn't checking whether that ancestor already had a GL program so it
would start generating the source again. It wouldn't however compile
that source again because _cogl_pipeline_backend_glsl_end does check
whether there is already a program. This patch moves the check until
after it has found the glsl_program_state, whether or not it was found
from an ancestor or as its own state.
This commit is contained in:
Neil Roberts 2010-12-02 16:30:55 +00:00
parent 6607306a2d
commit f54cc7abd4
1 changed files with 15 additions and 17 deletions
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32
cogl/cogl-pipeline-glsl.c
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@ -305,23 +305,7 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
set_glsl_priv (pipeline, priv);
}
/* If we already have a valid GLSL program then we don't need to
relink a new one */
if (priv->glsl_program_state)
{
/* However if the program has changed since the last link then we do
* need to relink */
if (user_program == NULL ||
(priv->glsl_program_state->user_program_age == user_program->age))
return TRUE;
/* Destroy the existing program. We can't just dirty the whole
glsl state because otherwise if we are not the authority on
the user program then we'll just find the same state again */
delete_program (priv->glsl_program_state->gl_program);
priv->glsl_program_state->gl_program = 0;
}
else
if (!priv->glsl_program_state)
{
/* If we don't have an associated glsl program yet then find the
* glsl-authority (the oldest ancestor whose state will result in
@ -358,6 +342,20 @@ _cogl_pipeline_backend_glsl_start (CoglPipeline *pipeline,
glsl_program_state_ref (authority_priv->glsl_program_state);
}
if (priv->glsl_program_state->gl_program)
{
/* If we already have a valid GLSL program then we don't need to
relink a new one. However if the program has changed since
the last link then we do need to relink */
if (user_program == NULL ||
(priv->glsl_program_state->user_program_age == user_program->age))
return TRUE;
/* We need to recreate the program so destroy the existing one */
delete_program (priv->glsl_program_state->gl_program);
priv->glsl_program_state->gl_program = 0;
}
/* If we make it here then we have a glsl_program_state struct
without a gl_program either because this is the first time we've
encountered it or because the user program has changed since it