llvmpipe/scene: move to slab allocated objects for scenes.

Currently we only allocate one scene, but I'd like to increase that
so move it to a slab allocator.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14923>

src/gallium/drivers/llvmpipe/lp_scene.c

@@ -37,6 +37,7 @@
 #include "lp_context.h"
 #include "lp_state_fs.h"
 
+#include "lp_setup_context.h"
 
 #define RESOURCE_REF_SZ 32
 
@@ -61,13 +62,15 @@ struct shader_ref {
  * \param queue  the queue to put newly rendered/emptied scenes into
  */
 struct lp_scene *
-lp_scene_create( struct pipe_context *pipe )
+lp_scene_create( struct lp_setup_context *setup )
 {
-   struct lp_scene *scene = CALLOC_STRUCT(lp_scene);
+   struct lp_scene *scene = slab_alloc_st(&setup->scene_slab);
    if (!scene)
       return NULL;
 
-   scene->pipe = pipe;
+   memset(scene, 0, sizeof(struct lp_scene));
+   scene->pipe = setup->pipe;
+   scene->setup = setup;
    scene->data.head = &scene->data.first;
 
    (void) mtx_init(&scene->mutex, mtx_plain);
@@ -100,7 +103,7 @@ lp_scene_destroy(struct lp_scene *scene)
    lp_fence_reference(&scene->fence, NULL);
    mtx_destroy(&scene->mutex);
    assert(scene->data.head == &scene->data.first);
-   FREE(scene);
+   slab_free_st(&scene->setup->scene_slab, scene);
 }
 
 

src/gallium/drivers/llvmpipe/lp_scene.h

@@ -140,6 +140,7 @@ struct lp_scene_surface {
 struct lp_scene {
    struct pipe_context *pipe;
    struct lp_fence *fence;
+   struct lp_setup_context *setup;
 
    /* The queries still active at end of scene */
    struct llvmpipe_query *active_queries[LP_MAX_ACTIVE_BINNED_QUERIES];
@@ -199,7 +200,7 @@ struct lp_scene {
 
 
 
-struct lp_scene *lp_scene_create(struct pipe_context *pipe);
+struct lp_scene *lp_scene_create(struct lp_setup_context *setup);
 
 void lp_scene_destroy(struct lp_scene *scene);
 

src/gallium/drivers/llvmpipe/lp_setup.c

@@ -1544,6 +1544,7 @@ lp_setup_destroy( struct lp_setup_context *setup )
       lp_scene_destroy(scene);
    }
 
+   slab_destroy(&setup->scene_slab);
    lp_fence_reference(&setup->last_fence, NULL);
 
    FREE( setup );
@@ -1584,9 +1585,12 @@ lp_setup_create( struct pipe_context *pipe,
    draw_set_rasterize_stage(draw, setup->vbuf);
    draw_set_render(draw, &setup->base);
 
+   slab_create(&setup->scene_slab,
+               sizeof(struct lp_scene),
+               MAX_SCENES);
    /* create some empty scenes */
    for (i = 0; i < MAX_SCENES; i++) {
-      setup->scenes[i] = lp_scene_create( pipe );
+      setup->scenes[i] = lp_scene_create( setup );
       if (!setup->scenes[i]) {
          goto no_scenes;
       }

src/gallium/drivers/llvmpipe/lp_setup_context.h

@@ -43,6 +43,7 @@
 #include "draw/draw_vbuf.h"
 #include "util/u_rect.h"
 #include "util/u_pack_color.h"
+#include "util/slab.h"
 
 #define LP_SETUP_NEW_FS          0x01
 #define LP_SETUP_NEW_CONSTANTS   0x02
@@ -89,6 +90,8 @@ struct lp_setup_context
    struct draw_stage *vbuf;
    unsigned num_threads;
    unsigned scene_idx;
+
+   struct slab_mempool scene_slab;
    struct lp_scene *scenes[MAX_SCENES];  /**< all the scenes */
    struct lp_scene *scene;               /**< current scene being built */