3 files changed, 100 insertions, 1 deletions

diff --git a/src/text.cc b/src/text.cc
index 51ddc9b..4a01c8e 100644
--- a/src/text.cc
+++ b/src/text.cc
@@ -289,3 +289,78 @@ void wayc_text_mesh_deinit(struct text_mesh_s* mesh) {
   mesh->vertices = nullptr;
   mesh->indices = nullptr;
 }
+
+static inline void wayc_text_buf_desc(struct sg_buffer_desc* vbo,
+                                      struct sg_buffer_desc* ebo) {
+  wayc_notnull(vbo);
+  wayc_notnull(ebo);
+
+  struct sg_buffer_usage usage = {};
+  usage.vertex_buffer = true;
+  usage.dynamic_update = false;
+  usage.stream_update = true;
+  usage.immutable = false;
+
+  vbo->usage = usage;
+  usage.vertex_buffer = false;
+  usage.index_buffer = true;
+  ebo->usage = usage;
+}
+
+bool wayc_text_group_init(struct text_group_s* group, struct font_s* font,
+                          usize glyph_capacity) {
+  wayc_notnull(group);
+  wayc_notnull(font);
+  memset(group, 0, sizeof(*group));
+
+  bool success = false;
+
+  usize nverts = glyph_capacity * WAYC_QUAD_NVERTS;
+  usize nindices = glyph_capacity * WAYC_QUAD_NINDICES;
+
+  usize verts_bytes = nverts * sizeof(struct text_vertex_s);
+  usize indices_bytes = nindices * sizeof(u16);
+
+  struct sg_buffer_desc vbo_desc = {};
+  struct sg_buffer_desc ebo_desc = {};
+  wayc_text_buf_desc(&vbo_desc, &ebo_desc);
+
+  vbo_desc.size = verts_bytes;
+  ebo_desc.size = indices_bytes;
+
+  struct sg_buffer vbuf = sg_make_buffer(&vbo_desc);
+  if (sg_query_buffer_state(vbuf) != SG_RESOURCESTATE_VALID) return false;
+  wayc_defer_cond(sg_destroy_buffer(vbuf), success, true);
+
+  struct sg_buffer ebuf = sg_make_buffer(&ebo_desc);
+  if (sg_query_buffer_state(ebuf) != SG_RESOURCESTATE_VALID) return false;
+  wayc_defer_cond(sg_destroy_buffer(ebuf), success, true);
+
+  group->vbuf = vbuf;
+  group->ebuf = ebuf;
+  group->glyph_capacity = glyph_capacity;
+  group->font = font;
+
+  success = true;
+  return success;
+}
+
+void wayc_text_group_begin(struct text_group_s* group) {
+  wayc_notnull(group);
+
+  group->index_count = 0;
+  group->glyph_count = 0;
+}
+
+void wayc_text_group_end(struct text_group_s* group,
+                         struct font_context_s* context) {
+  wayc_notnull(group);
+  wayc_notnull(context);
+}
+
+void wayc_text_group_deinit(struct text_group_s* group) {
+  wayc_notnull(group);
+
+  sg_destroy_buffer(group->vbuf);
+  sg_destroy_buffer(group->ebuf);
+}
diff --git a/src/text.h b/src/text.h
index aed11ed..ad3d8af 100644
--- a/src/text.h
+++ b/src/text.h
@@ -79,3 +79,19 @@ struct text_mesh_s {
 bool wayc_text_mesh_init(struct text_mesh_s* mesh, const char* text,
                          usize text_len, struct font_s* font, vec2 position);
 void wayc_text_mesh_deinit(struct text_mesh_s* mesh);
+
+struct text_group_s {
+  struct font_s* font;
+  sg_buffer vbuf;
+  sg_buffer ebuf;
+  usize index_count;
+  usize glyph_count;
+  usize glyph_capacity;
+};
+
+bool wayc_text_group_init(struct text_group_s* group, struct font_s* font,
+                          usize glyph_capacity);
+void wayc_text_group_begin(struct text_group_s* group);
+void wayc_text_group_end(struct text_group_s* group,
+                         struct font_context_s* context);
+void wayc_text_group_deinit(struct text_group_s* group);
diff --git a/src/wayclock.cc b/src/wayclock.cc
index 390d9a1..45d22fe 100644
--- a/src/wayclock.cc
+++ b/src/wayclock.cc
@@ -19,6 +19,8 @@
 
 struct app_s {
   struct renderer_s* renderer;
+  struct text_group_s* text_group;
+  struct font_context_s* font_context;
   struct font_s* font;
 };
 
@@ -38,6 +40,8 @@ void wayc_frame(struct app_s* app, struct window_s* window,
   wayc_defer(wayc_text_mesh_deinit(&text_mesh));
 
   wayc_renderer_begin(renderer);
+  wayc_text_group_begin(app->text_group);
+  wayc_text_group_end(app->text_group, app->font_context);
   wayc_renderer_end(renderer);
 }
 
@@ -111,7 +115,11 @@ int main() {
     wayc_panic("Failed to initialize font");
   wayc_defer(wayc_font_deinit(&font));
 
-  struct app_s app = {&renderer, &font};
+  struct text_group_s text_group;
+  if (!wayc_text_group_init(&text_group, &font, 128))
+    wayc_panic("Failed to initialize text group");
+
+  struct app_s app = {&renderer, &text_group, &font_context, &font};
 
   while (wayc_eventloop_running(&loop)) {
     wayc_eventloop_update(&loop, (u8*)&app);