1 files changed, 75 insertions, 0 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);
+}