rename sokol examples, so that they can be run from root

examples/sokol_examples/drawing.v

@@ -0,0 +1,84 @@
+import sokol
+import sokol.sapp
+import sokol.gfx
+import sokol.sgl
+import fontstash
+
+struct AppState {
+	pass_action sg_pass_action
+}
+
+fn main() {
+	state := &AppState{
+		pass_action: gfx.create_clear_pass(0.1, 0.1, 0.1, 1.0)
+	}
+
+	desc := sapp_desc{
+		user_data: state
+		init_userdata_cb: init
+		frame_userdata_cb: frame
+		window_title: 'Sokal Drawing Template'.str
+	}
+	sapp.run(&desc)
+}
+
+fn init(user_data voidptr) {
+	desc := sg_desc {
+		mtl_device: C.sapp_metal_get_device()
+		mtl_renderpass_descriptor_cb: sapp_metal_get_renderpass_descriptor
+		mtl_drawable_cb: sapp_metal_get_drawable
+		d3d11_device: sapp_d3d11_get_device()
+		d3d11_device_context: sapp_d3d11_get_device_context()
+		d3d11_render_target_view_cb: sapp_d3d11_get_render_target_view
+		d3d11_depth_stencil_view_cb: sapp_d3d11_get_depth_stencil_view
+	}
+	gfx.setup(&desc)
+
+	sgl_desc := sgl_desc_t{}
+	sgl.setup(&sgl_desc)
+}
+
+fn frame(user_data voidptr) {
+	//println('frame')
+	state := &AppState(user_data)
+
+	draw()
+
+	gfx.begin_default_pass(&state.pass_action, sapp.width(), sapp.height())
+	sgl.draw()
+	gfx.end_pass()
+	gfx.commit()
+}
+
+fn draw() {
+	// first, reset and setup ortho projection
+	sgl.defaults()
+	sgl.matrix_mode_projection()
+	sgl.ortho(0.0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
+
+	sgl.c4b(255, 0, 0, 128)
+	draw_hollow_rect(10, 10, 100, 30)
+
+	sgl.c4b(25, 150, 0, 128)
+	draw_filled_rect(10, 150, 80, 40)
+	//line(0, 0, 500, 500)
+}
+
+fn draw_hollow_rect(x, y, w, h f32) {
+    sgl.begin_line_strip()
+    sgl.v2f(x, y)
+	sgl.v2f(x + w, y)
+	sgl.v2f(x + w, y + h)
+	sgl.v2f(x, y + h)
+	sgl.v2f(x, y)
+    sgl.end()
+}
+
+fn draw_filled_rect(x, y, w, h f32) {
+    sgl.begin_quads()
+	sgl_v2f(x, y)
+    sgl_v2f(x + w, y)
+    sgl_v2f(x + w, y + h)
+    sgl_v2f(x, y + h)
+    sgl.end()
+}