sokol and fontstash modules

vlib/sokol/sgl/sgl_structs.v

@@ -0,0 +1,24 @@
+module sgl
+
+// should be in a proper module
+pub enum SglError {
+    no_error
+	vertices_full
+	commands_full
+	stack_overflow
+	stack_underfloat
+}
+
+pub struct C.sgl_pipeline {
+	id u32
+}
+
+pub struct C.sgl_desc_t {
+    max_vertices int       /* size for vertex buffer */
+    max_commands int       /* size of uniform- and command-buffers */
+    pipeline_pool_size int /* size of the internal pipeline pool, default is 64 */
+    color_format C.sg_pixel_format
+    depth_format C.sg_pixel_format
+    sample_count int
+    face_winding C.sg_face_winding /* default front face winding is CCW */
+}