diff --git a/src/main.c b/src/main.c
index bd9cd4d..d8650f5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -28,22 +28,33 @@ static void log_fn(const char* tag, uint32_t log_level, uint32_t log_item_id, co
     fprintf(stderr, "[%s - %s]: (%d) %s \nat %s:%d", tag, log_level == 0 ? "FATAL" : log_level == 1 ? "ERROR" : "WARNING", log_item_id, message_or_null, filename_or_null, line_nr);
 }
 
+//#define _SG_LOG_ITEMS \
+    _SG_LOGITEM_XMACRO(COMPUTE_INVALID_BUFFER, "invalid buffer");
+
 static void draw_scene(userdata_t* ud)
 {
-    /* if(ud->scene.dirty)
+    if(ud->scene.dirty)
     {
-        //sg_update_buffer(ud->compute.shared_buffer, SG_RANGE(ud->scene));
+        sg_buffer seg_buffer = sg_query_view_buffer(ud->compute.bindings.views[0]);
+        //_SG_VALIDATE(seg_buffer.id == SG_INVALID_ID, COMPUTE_INVALID_BUFFER);
+        sg_update_buffer(seg_buffer, &(sg_range) { .ptr = ud->scene.segments, .size = sizeof(segment_t) * ud->scene.num_segments });
+
+        sg_buffer shape_buffer = sg_query_view_buffer(ud->compute.bindings.views[1]);
+        //_SG_VALIDATE(shape_buffer.id == SG_INVALID_ID, COMPUTE_INVALID_BUFFER);
+        sg_update_buffer(shape_buffer, &(sg_range) { .ptr = ud->scene.shapes, .size = sizeof(shape_meta_t) * ud->scene.num_shapes });
+
+        sg_begin_pass(&(sg_pass){ .compute = true, .label = "Compute Pass" });
+        sg_apply_pipeline(ud->compute.pipeline);
+        sg_apply_uniforms(0, &SG_RANGE(ud->renderer.uniforms));
+        sg_apply_uniforms(1, &SG_RANGE(ud->scene.tiles[0]));
+        sg_apply_bindings(&ud->compute.bindings);
+
+        sg_dispatch(TILE_SIZE / 8, TILE_SIZE / 8, 1);
+
+        sg_end_pass();
+
         ud->scene.dirty = false;
     }
-
-    sg_begin_pass(&(sg_pass){ .compute = true, label = "compute-pass" });
-    sg_apply_pipeline(ud->compute.pipeline);
-    sg_apply_uniforms(0, &SG_RANGE(ud->renderer.uniforms));
-    sg_apply_bindings(&ud->compute.bindings);
-
-    sg_dispatch(1, 1, 1);
-
-    sg_end_pass(); */
 }
 
 static void frame(void* _userdata)
@@ -64,7 +75,7 @@ static void frame(void* _userdata)
         .dpi_scale = sapp_dpi_scale(),
     });
 
-    igBegin("Framerate", (bool*) true, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse  | ImGuiWindowFlags_NoTitleBar);
+    igBegin("Framerate", (bool*) true, ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar);
     igText("%.0f FPS", 1 / sapp_frame_duration());
     igText("%.3fms", sapp_frame_duration() * 1000);
     igEnd();
@@ -214,6 +225,10 @@ static void init(void* _userdata)
             .colors[0] = { .clear_value = { 0.0f, 0.0f, 0.0f, 1.0f }, .load_action = SG_LOADACTION_CLEAR }
         }
     };
+
+    add_rectangle(&ud->scene, (vec2) { 200.0f, 100.0f }, (vec2) { 100.0f, 150.0f });
+    add_circle(&ud->scene, (vec2) { 400.0f, 300.0f }, 125.0f);
+    scene_add_tile(&ud->scene, (tile_cache_entry) { .id = { .lod = 0, .tile = TILE_SIZE, .world_min = { 0.0f, 0.0f }, .world_max = { 1024.0f, 1024.0f } } });
 }
 
 static void cleanup(void* _userdata)
diff --git a/src/shape.h b/src/shape.h
index 70bc32b..5c2a88d 100644
--- a/src/shape.h
+++ b/src/shape.h
@@ -13,19 +13,7 @@ typedef struct shape_meta_t {
     float bbox_min_x, bbox_min_y, bbox_max_x, bbox_max_y;
 } shape_meta_t;
 
-typedef struct scene_t {
-    uint32_t      num_shapes;
-    uint32_t      max_shapes;
-    shape_meta_t* shapes;
-
-    uint32_t      num_segments;
-    uint32_t      max_segments;
-    segment_t*    segments;
-
-    bool dirty;
-} scene_t;
-
-#define TILE_SIZE 64   // pixels per tile (same for all LODs)
+#define TILE_SIZE 128   // pixels per tile (same for all LODs)
 
 // Tile descriptor
 typedef struct tile_ID {
@@ -41,10 +29,26 @@ typedef struct tile_ID {
 typedef struct tile_cache_entry {
     tile_ID  id;
     // GPU texture holding the SDF values (R32Float)
-    WGPUTexture texture; //TODO
+    sg_buffer SDF; //TODO
     bool    ready;
 } tile_cache_entry;
 
+typedef struct scene_t {
+    uint32_t      num_shapes;
+    uint32_t      max_shapes;
+    shape_meta_t* shapes;
+
+    uint32_t      num_segments;
+    uint32_t      max_segments;
+    segment_t*    segments;
+
+    uint32_t          num_tiles;
+    uint32_t          max_tiles;
+    tile_cache_entry* tiles;
+
+    bool dirty;
+} scene_t;
+
 // Initialise a scene_t with a given capacity for shapes and segments.
 static int scene_init(scene_t* s, int init_shape_cap, int init_seg_cap) {
     s->num_shapes = 0;
@@ -55,9 +59,13 @@ static int scene_init(scene_t* s, int init_shape_cap, int init_seg_cap) {
     s->max_segments = init_seg_cap;
     s->segments = (segment_t*) malloc(init_seg_cap * sizeof(segment_t));
 
+    s->num_tiles = 0;
+    s->max_tiles = 8;
+    s->tiles = (tile_cache_entry*) malloc(8 * sizeof(tile_cache_entry));
+
     s->dirty = true;
 
-    if (!s->shapes || !s->segments) return 0;   // allocation failure
+    if (!s->shapes || !s->segments || !s->tiles) return 0;   // allocation failure
     return 1;
 }
 
@@ -93,10 +101,26 @@ static int scene_add_shape(scene_t* s, shape_meta_t meta) {
     return idx;
 }
 
+static int scene_add_tile(scene_t* s, tile_cache_entry tile)
+{
+    if (s->num_tiles >= s->max_tiles) {
+        int new_cap = s->max_tiles * 2;
+        tile_cache_entry* tmp = (tile_cache_entry*) realloc(s->tiles, new_cap * sizeof(tile_cache_entry));
+        if (!tmp) return -1;
+        s->tiles = tmp;
+        s->max_tiles = new_cap;
+    }
+    int idx = s->num_tiles++;
+    s->tiles[idx] = tile;
+
+    s->dirty = true;
+    return idx;
+}
 
 static int scene_shutdown(scene_t* s) {
     free(s->segments);
     free(s->shapes);
+    free(s->tiles);
 
     free(s);
     return 1;