Neil Roberts 5085919acc pipeline-cache: Prune old unused pipelines when the cache gets too big ... Previously when a pipeline is added to the cache it would never be removed. If the application is generating a lot of unique pipelines this can end up effectively leaking a large number of resources including the GL program objects. Arguably this isn't really a problem because if the application is generating that many unique pipelines then it is doing something wrong anyway. It also implies that it will be recompiling shaders very often so the cache leaking will likely be the least of the problems. This patch makes it keep track of which pipelines in the cache are in use. The cache now returns a struct representing the entry instead of directly returning the pipeline. This entry contains a usage counter which the pipeline backends can use to mark when there is a pipeline alive that is using the cache entry. When the hash table decides that it's a good time to prune some entries, it will make a list of all of the pipelines that are not in use and then remove the least recently used half of the pipelines. That way it is less likely to remove pipelines that the application is actually regenerating often even if they aren't in use all of the time. When the cache is pruned the hash table makes a note of how small the cache could be if it removed all of the unused pipelines. The hash table starts pruning when there are more entries than twice this minimum expected size. The idea is that if that case it hit then the hash table is more than half full of useless pipelines so the application is generating lots of redundant pipelines and it is a good time to remove them. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit c21aac22992bb7fef5a8d0913130b8245e67f2eb) Conflicts: cogl/driver/gl/cogl-pipeline-fragend-glsl.c cogl/driver/gl/cogl-pipeline-progend-glsl.c cogl/driver/gl/cogl-pipeline-vertend-glsl.c cogl/driver/gl/gl/cogl-pipeline-fragend-arbfp.c		2014-01-14 12:05:17 +00:00
..
gl	pipeline-cache: Prune old unused pipelines when the cache gets too big	2014-01-14 12:05:17 +00:00
gles	introduce texture loaders to make allocations lazy	2014-01-09 15:49:46 +00:00
cogl-attribute-gl-private.h	buffer: splits out GL specific code	2013-01-22 17:47:59 +00:00
cogl-attribute-gl.c	Use COGL_FLAGS_* for the context's private feature flags	2013-11-28 18:12:22 +00:00
cogl-buffer-gl-private.h	Allow propogation of OOM errors to apps	2013-01-22 17:48:07 +00:00
cogl-buffer-gl.c	buffer: Don't set the invalidate hint when requesting read access	2013-02-19 15:03:30 +00:00
cogl-clip-stack-gl-private.h	clip-stack: Splits out opengl specific code	2013-01-22 17:47:59 +00:00
cogl-clip-stack-gl.c	Use COGL_FLAGS_* for the context's private feature flags	2013-11-28 18:12:22 +00:00
cogl-framebuffer-gl-private.h	framebuffer: Bind the framebuffer before querying the bits	2013-01-22 17:48:18 +00:00
cogl-framebuffer-gl.c	remove internal_format and redundant error arguments	2014-01-09 15:49:47 +00:00
cogl-pipeline-fragend-fixed-private.h	Re-organize the source layout	2013-01-22 17:47:19 +00:00
cogl-pipeline-fragend-fixed.c	Remove cogl-internal.h	2013-01-22 17:48:17 +00:00
cogl-pipeline-fragend-glsl-private.h	Re-organize the source layout	2013-01-22 17:47:19 +00:00
cogl-pipeline-fragend-glsl.c	pipeline-cache: Prune old unused pipelines when the cache gets too big	2014-01-14 12:05:17 +00:00
cogl-pipeline-opengl-private.h	pipeline: improve real_blend_enable checks	2013-06-06 21:27:09 +01:00
cogl-pipeline-opengl.c	Use COGL_FLAGS_* for the context's private feature flags	2013-11-28 18:12:22 +00:00
cogl-pipeline-progend-fixed-private.h	Re-organize the source layout	2013-01-22 17:47:19 +00:00
cogl-pipeline-progend-fixed.c	Use COGL_FLAGS_* for the context's private feature flags	2013-11-28 18:12:22 +00:00
cogl-pipeline-progend-glsl-private.h	Re-organize the source layout	2013-01-22 17:47:19 +00:00
cogl-pipeline-progend-glsl.c	pipeline-cache: Prune old unused pipelines when the cache gets too big	2014-01-14 12:05:17 +00:00
cogl-pipeline-vertend-fixed-private.h	Re-organize the source layout	2013-01-22 17:47:19 +00:00
cogl-pipeline-vertend-fixed.c	Don't generate GLSL for the point size for default pipelines	2013-06-21 14:18:37 +01:00
cogl-pipeline-vertend-glsl-private.h	Re-organize the source layout	2013-01-22 17:47:19 +00:00
cogl-pipeline-vertend-glsl.c	pipeline-cache: Prune old unused pipelines when the cache gets too big	2014-01-14 12:05:17 +00:00
cogl-texture-2d-gl-private.h	texture: remove _cogl_texture_prepare_for_upload	2013-07-29 16:31:44 +01:00
cogl-texture-2d-gl.c	remove internal_format and redundant error arguments	2014-01-09 15:49:47 +00:00
cogl-texture-gl-private.h	Move _cogl_texture_get_gl_format to -texture-gl.c	2013-01-22 17:48:17 +00:00
cogl-texture-gl.c	Use COGL_FLAGS_* for the context's private feature flags	2013-11-28 18:12:22 +00:00
cogl-util-gl-private.h	Add the layer's sampler and uniform declarations at the start	2013-02-27 15:53:43 +00:00
cogl-util-gl.c	Add the layer's sampler and uniform declarations at the start	2013-02-27 15:53:43 +00:00