todo list
 - [x] shader compiling
 - [x] windowing + input
 - [x] vulkan device and swapchain, etc
 - [x] draw a triangle
 - [x] texture conversion + compression, etc
 - [x] texture the triangle
 - [x] refactor pipelines and vertex formats to be more flexible
 - [x] simple text rendering
 - [x] 3D maths library
 - [x] model conversion
 - [x] render a model
 - [x] depth buffer
 - [x] seperate framebuffers and renderpasses
 - [x] VRAM allocator
 - [x] don't re-bind pipelines and descriptors if not necessary
 - [ ] memory debug tool
 - [x] material system
 - [ ] render a sky box
 - [ ] PBR + IBL
 - [ ] shadows
 - [ ] MSAA
 - [ ] GI
 - [ ] clustering
 - [ ] bloom
 - [ ] SSAO
 - [ ] SSDO
 - [ ] SSR