Deduplicate multiple mesh instances

assets/cube.obj

@@ -0,0 +1,55 @@
+# Simple textured cube
+# 8 vertices, 6 faces (12 triangles), per-face UVs
+
+o Cube
+
+# Positions
+v -1.0 -1.0  1.0
+v  1.0 -1.0  1.0
+v  1.0  1.0  1.0
+v -1.0  1.0  1.0
+v -1.0 -1.0 -1.0
+v  1.0 -1.0 -1.0
+v  1.0  1.0 -1.0
+v -1.0  1.0 -1.0
+
+# Texture coordinates
+vt 0.0 0.0
+vt 1.0 0.0
+vt 1.0 1.0
+vt 0.0 1.0
+
+# Normals
+vn  0.0  0.0  1.0
+vn  0.0  0.0 -1.0
+vn  1.0  0.0  0.0
+vn -1.0  0.0  0.0
+vn  0.0  1.0  0.0
+vn  0.0 -1.0  0.0
+
+# Faces (front, back, right, left, top, bottom)
+# Each face uses two triangles: (0,1,2) and (0,2,3)
+
+# Front (+Z)
+f 1/1/1 2/2/1 3/3/1
+f 1/1/1 3/3/1 4/4/1
+
+# Back (-Z)
+f 6/1/2 5/2/2 8/3/2
+f 6/1/2 8/3/2 7/4/2
+
+# Right (+X)
+f 2/1/3 6/2/3 7/3/3
+f 2/1/3 7/3/3 3/4/3
+
+# Left (-X)
+f 5/1/4 1/2/4 4/3/4
+f 5/1/4 4/3/4 8/4/4
+
+# Top (+Y)
+f 4/1/5 3/2/5 7/3/5
+f 4/1/5 7/3/5 8/4/5
+
+# Bottom (-Y)
+f 5/1/6 6/2/6 2/3/6
+f 5/1/6 2/3/6 1/4/6

compile/build.odin

@@ -32,8 +32,6 @@ PROJECT_NAME :: "sindri"
 BUILD_DIRECTORY :: "out/"
 
 GAME_SRC_DIR :: "game/"
-GAME_LIB_PATH :: BUILD_DIRECTORY + "game" + LIB_EXT
-GAME_LIB_TMP_PATH :: BUILD_DIRECTORY + "game_tmp" + LIB_EXT
 
 ENGINE_DIR :: "src/"
 ENGINE_OUTPUT :: BUILD_DIRECTORY + PROJECT_NAME
@@ -47,6 +45,7 @@ Options :: struct {
 	debug:        bool `args:"optional"            usage:"Build project in debug-mode."`,
 	release:      bool `args:"optional"            usage:"Build project in release-mode."`,
 	run:          bool `args:"optional"            usage:"Run project."`,
+	hot_reload:   bool `args:"optional"            usage:"Hot-reload project."`,
 	wgpu_init:    bool `args:"optional"            usage:"Prepare wgpu-native."`,
 	wgpu_version: string `args:"optional"          usage:"Override the wgpu release version to init."`,
 	fmt:          bool `args:"optional"            usage:"Run odinfmt."`,
@@ -77,6 +76,7 @@ main :: proc() {
 	if opts.debug do build_project(true, opts.overflow[:])
 	if opts.release do build_project(false, opts.overflow[:])
 	if opts.run do run_project(opts.overflow[:])
+	if opts.hot_reload do hot_reload(!opts.release, opts.overflow[:])
 	if opts.wgpu_init do wgpu_init(opts.wgpu_version)
 	if opts.fmt do format_source()
 	if opts.pre_commit do pre_commit()
@@ -91,17 +91,12 @@ main :: proc() {
 // Build project
 
 // Build the game library ('game/') and the engine ('src/')
-build_project :: proc(debug: bool, odin_extra_args: []string) {
+build_project :: proc(debug: bool, extra_args: []string) {
 	version := project_version()
 
 	// Setup compiled wgpu binary
 	wgpu_init()
 
-	// ----------------------------------------
-	// Game compile
-
-	build_game(debug, version, odin_extra_args)
-
 	// ----------------------------------------
 	// Engine compile
 
@@ -111,7 +106,7 @@ build_project :: proc(debug: bool, odin_extra_args: []string) {
 		return
 	}
 
-	build_engine(debug, version, odin_extra_args)
+	build_engine(debug, version, extra_args)
 }
 
 // Shared builder between game/engine
@@ -124,6 +119,7 @@ build_common :: proc(
 	b := brokkr.builder_make()
 	brokkr.build(&b, dir)
 	brokkr.append(&b, "-show-timings")
+	brokkr.collection(&b, "game", ".")
 	brokkr.collection(&b, PROJECT_NAME, "src")
 	brokkr.collection(&b, "gram", "vendor/gram/src")
 	brokkr.collection(&b, "wgpu", "vendor")
@@ -144,24 +140,6 @@ build_common :: proc(
 	return b
 }
 
-// Build the game as a dynamic library loaded by the engine
-build_game :: proc(debug: bool, version: string, extra_args: []string) {
-	b := build_common(GAME_SRC_DIR, debug, version, extra_args)
-	defer brokkr.builder_destroy(&b)
-	brokkr.mode(&b, .Dynamic)
-	// Use a temp file because it first writes an empty file, which the engine
-	// would load before it is actually fully written
-	brokkr.out(&b, GAME_LIB_TMP_PATH)
-	if err := brokkr.execute(&b); err != nil {
-		os.exit(1)
-	}
-
-	if !os.is_file(GAME_LIB_TMP_PATH) {
-		die("build produced no game lib %q", GAME_LIB_TMP_PATH)
-	}
-	os.rename(GAME_LIB_TMP_PATH, GAME_LIB_PATH)
-}
-
 // Build the engine executable
 build_engine :: proc(debug: bool, version: string, extra_args: []string) {
 	b := build_common(ENGINE_DIR, debug, version, extra_args)
@@ -174,8 +152,7 @@ build_engine :: proc(debug: bool, version: string, extra_args: []string) {
 
 run_project :: proc(extra_args: []string) {
 	// Build project if it wasnt already
-	if !os.exists(ENGINE_OUTPUT) ||
-	   !os.exists(GAME_LIB_PATH) { build_project(true, {}) }
+	if !os.exists(output_path(ENGINE_OUTPUT)) do build_project(true, {})
 
 	cmd := []string{output_path(ENGINE_OUTPUT)}
 	line := slice.concatenate(
@@ -206,6 +183,34 @@ run_project :: proc(extra_args: []string) {
 	os.exit(res.exit_code)
 }
 
+hot_reload :: proc(debug: bool, extra_args: []string) {
+	if engine_is_running() {
+		process := output_path(PROJECT_NAME)
+		when ODIN_OS == .Windows {
+			// Ask process to shut down gracefully (equivalent to SIGTERM)
+			_, ok, _ := exec([]string{"taskkill", "/IM", process + ".exe"})
+			if !ok {
+				die("hot reload: failed to terminate running %s", process)
+			}
+		} else {
+			_, ok, _ := exec([]string{"pkill", "-TERM", "-x", process})
+			if !ok {
+				die(
+					"hot reload: failed to send SIGTERM to running %s",
+					process,
+				)
+			}
+		}
+
+		// Wait for process to terminate
+		for engine_is_running() {
+			time.sleep(time.Millisecond * 20)
+		}
+	}
+
+	run_project(extra_args)
+}
+
 // -----------------------------------------
 // wgpu setup
 

docs/hot-reloading.md

@@ -0,0 +1,47 @@
+# Hot Reloading
+
+Instead of having the engine as an exe and game as a dll, and having to jump
+through hoops to share libraries internal state between them we do it
+differently. The engine and game live in the same binary, compiled fully each
+time. We rely mostly on static memory, and register these memory regions. Then
+when we want to hot reload: we send a close signal to the running instance, it
+writes a snapshot of the active memory to disk, instance closes, recompile,
+restart the application, it restores the memory from the snapshot.
+
+## Byte Layout On Disk
+
+```odin
+Snapshot_Header :: struct #packed #all_or_none {
+	magic_string:     u32,
+	version:          u16, // spec of the snapshot
+    app_version:      [4 + time.MIN_YYYY_DATE_LEN + 8]u8, // example: `dev-2026-09-23-a4084b3`
+    region_count:     u32,
+}
+
+Region_Header :: struct #packed #all_or_none {
+	name_size: u32,
+	data_size: u32,
+}
+```
+
+[ Snapshot_Header  ]
+[ Region_Header    ]
+[   name bytes     ]
+[   data bytes     ]
+[ Region_Header    ]
+[   name bytes     ]
+[   data bytes     ]
+[ etc..            ]
+
+## Diff Checking
+
+Use hashing per memory segment to do a sanity diff-check.
+
+```odin
+import "core:crypto/hash"
+
+data: []byte = ...
+
+digest := hash.hash_bytes(hash.Algorithm.SHA256, data)
+defer delete(digest)
+```

game/game.odin

@@ -7,39 +7,42 @@ import "sindri:base"
 import "sindri:core"
 
 // -----------------------------------------
+// Types
 
 Game_Memory :: struct {
 	should_close: bool,
 }
 
-g: ^Game_Memory
+Test_Memory :: struct {
+	asd: int,
+	qwe: int,
+}
 
 // -----------------------------------------
+// Variables
 
-@(export)
-memory :: proc() -> rawptr {
-	return g
+g: Game_Memory
+t: Test_Memory
+
+game_api := core.Game_API {
+	settings      = settings,
+	init_once     = init_once,
+	init          = init,
+	update        = update,
+	render        = render,
+	destroy       = destroy,
+	should_close  = should_close,
+	force_reload  = force_reload,
+	force_restart = force_restart,
 }
 
-@(export)
-memory_free :: proc() {
-	free(g)
+// -----------------------------------------
+// Public functions
+
+api :: proc() -> ^core.Game_API {
+	return &game_api
 }
 
-@(export)
-memory_size :: proc() -> int {
-	return size_of(Game_Memory)
-}
-
-@(export)
-memory_set :: proc(mem: rawptr) {
-	g = (^Game_Memory)(mem)
-
-	// Here you can also set your own global variables. A good idea is to make
-	// your global variables into pointers that point to something inside `g`.
-}
-
-@(export)
 settings :: proc() -> base.Settings {
 	return base.Settings {
 		width = 960,
@@ -51,36 +54,40 @@ settings :: proc() -> base.Settings {
 	}
 }
 
-@(export)
 init_once :: proc() {
 	fmt.println("init once")
+
+	base.register_region("game_memory", &g, size_of(Game_Memory))
+	base.register_region("test_memory", &t, size_of(Test_Memory))
 }
 
-@(export)
 init :: proc() {
 	fmt.println("hello from .dll!")
 
-	g = new(Game_Memory)
-	memory_set(g)
+	g.should_close = false
 }
 
-@(export)
 update :: proc(dt: f32) {
 	fmt.println("dt:", dt)
 
 	if core.key_state(.Key_Escape) == .Press {
 		g.should_close = true
 	}
+
+	if core.key_state(.Key_F5) == .Press do t.asd = 555
+	if core.key_state(.Key_F6) == .Press do t.asd = 666
 }
 
-@(export)
+render :: proc() {  }
+
 destroy :: proc() {
 	fmt.println("bye")
+
+	fmt.println(t.asd, t.qwe)
 }
 
 start := time.tick_now()
 
-@(export)
 should_close :: proc() -> bool {
 	elapsed := time.tick_since(start)
 	seconds := time.duration_seconds(elapsed)
@@ -89,12 +96,10 @@ should_close :: proc() -> bool {
 	return g.should_close
 }
 
-@(export)
 force_reload :: proc() -> bool {
 	return core.key_state(.Key_F5) == .Press
 }
 
-@(export)
 force_restart :: proc() -> bool {
 	return core.key_state(.Key_F6) == .Press
 }

ols.json

@@ -1,7 +1,8 @@
 {
     "collections": [
+        { "name": "game",   "path": "." },
         { "name": "sindri", "path": "src" },
         { "name": "gram",   "path": "vendor/gram/src" },
-        { "name": "wgpu",    "path": "vendor" }
+        { "name": "wgpu",   "path": "vendor" }
     ]
 }

src/base/base.odin

@@ -0,0 +1,3 @@
+package base
+
+should_close: bool

src/base/event.odin

@@ -158,8 +158,6 @@ on_event :: proc(data: Event_Data) {
 drain_event_queue :: proc() {
 	assert(event_bus.queue != nil)
 
-	fmt.println("toby!")
-
 	for &event in event_bus.queue {
 
 		#partial switch e in event.data {

src/base/hot_reload.odin

@@ -1,231 +1,302 @@
 package base
 
-import "core:c"
-import "core:dynlib"
+import "base:runtime"
+import "core:crypto/hash"
 import "core:fmt"
+import "core:mem"
 import "core:os"
+import "core:strings"
 import "core:time"
 
-when ODIN_OS == .Windows {
-	LIB_EXT :: ".dll"
-} else when ODIN_OS == .Darwin {
-	LIB_EXT :: ".dylib"
-} else {
-	LIB_EXT :: ".so"
-}
+SNAPSHOT_NAME :: "snapshot"
+SNAPSHOT_EXTENSION :: "sndr"
 
-GAME_LIB_DIR :: "out/"
-GAME_LIB_PATH :: GAME_LIB_DIR + "game" + LIB_EXT
+MAGIC_STRING :: 0x72646E73 // "rdns" -> "sndr" in little endian
+HOT_RELOAD_VERSION :: 1
+APP_VERSION_SIZE :: 4 + time.MIN_YYYY_DATE_LEN + 8 + 6 // example: `dev-2026-09-23-a4084b3-debug`
 
 // -----------------------------------------
+// Types
 
+@(private)
+Snapshot_Header :: struct #packed #all_or_none {
+	magic_string: u32,
+	version:      u16, // spec of the snapshot
+	app_version:  [APP_VERSION_SIZE]u8,
+	region_count: u32,
+}
+
+@(private)
+Region_Header :: struct #packed #all_or_none {
+	name_size: u32,
+	data_size: u32,
+}
+
+@(private)
+Memory_Region :: struct {
+	ptr_location: rawptr,
+	// TODO: How do we do hash compare without having to hash current memory every frame?
+	digest:       []u8, // hash of this region in last snapshot
+}
+
+@(private)
 Hot_Reload :: struct {
-	loaded_libs: [dynamic]Game_API,
-}
-
-Hot_Reload_Error :: enum u8 {
-	None                 = 0,
-	Load_Game_Lib_Failed = 1,
-	Unimplemented        = 127,
-	Okay                 = None,
-}
-
-Error :: union #shared_nil {
-	Hot_Reload_Error,
-}
-
-Game_API :: struct {
-	lib:               dynlib.Library,
-	memory:            proc() -> rawptr,
-	memory_free:       proc(),
-	memory_size:       proc() -> int,
-	memory_set:        proc(mem: rawptr),
-	settings:          proc() -> Settings,
-	init_once:         proc(),
-	init:              proc(),
-	update:            proc(_: f32),
-	render:            proc(),
-	destroy:           proc(),
-	should_close:      proc() -> bool,
-	force_reload:      proc() -> bool,
-	force_restart:     proc() -> bool,
-	modification_time: time.Time,
-	api_version:       int, // iteration of the game lib
+	allocator:           runtime.Allocator,
+	snapshot_path:       string,
+	snapshot_header:     Snapshot_Header,
+	region_headers:      map[string]Region_Header, // hash of name:size
+	regions:             map[string]Memory_Region, // hash of name:size
+	write_full_snapshot: bool,
 }
 
 // -----------------------------------------
+// Variables
 
-hot_reload_init :: proc() -> (hr: Hot_Reload, error: Error) {
-	api: Game_API
-
-	api_ok := load_game_lib(&api)
-	if !api_ok {
-		fmt.println("error: failed to load Game API")
-		return {}, .Load_Game_Lib_Failed
-	}
-
-	hr.loaded_libs = make([dynamic]Game_API, 0, 0, context.allocator)
-	append(&hr.loaded_libs, api)
-
-	return hr, nil
-}
-
-hot_reload_destroy :: proc(state: ^Hot_Reload) {
-	for &api in state.loaded_libs {
-		unload_game_lib(&api)
-	}
-
-	delete(state.loaded_libs)
-}
+@(private)
+hr: Hot_Reload
 
 // -----------------------------------------
+// Constructor & destructor
 
-active_lib :: proc(hr: ^Hot_Reload) -> ^Game_API {
-	return &hr.loaded_libs[len(hr.loaded_libs) - 1]
-}
-
-should_close :: proc(hr: ^Hot_Reload) -> bool {
-	api := active_lib(hr)
-	if api.lib == nil do return true
-	return api.should_close()
-}
-
-copy_lib :: proc(to: string) -> bool {
-	copy_err := os.copy_file(to, GAME_LIB_PATH)
-	if copy_err != nil {
-		fmt.printfln(
-			"error: failed to copy {0} to {1}: {2:v}",
-			GAME_LIB_PATH,
-			to,
-			copy_err,
-		)
-		return false
-	}
-
-	return true
-}
-
-// Load game lib symbols
-load_game_lib :: proc(api: ^Game_API) -> bool {
-	mod_time, mod_time_err := os.last_write_time_by_name(GAME_LIB_PATH)
-	if mod_time_err != os.ERROR_NONE {
-		fmt.printfln(
-			"error: failed getting last write time of {0}, error code: {1}",
-			GAME_LIB_PATH,
-			mod_time_err,
-		)
-		return false
-	}
-	api.modification_time = mod_time
-
-	lib_name := fmt.tprintf(
-		GAME_LIB_DIR + "game_{0}" + LIB_EXT,
-		api.api_version,
+hot_reload_init :: proc(
+	app_version: string,
+	allocator := context.allocator,
+) -> os.Error {
+	// Get snapshot path
+	out := os.get_executable_directory(allocator) or_return
+	defer delete(out, allocator)
+	snapshot_path := fmt.tprintf(
+		"%v/%v.%v",
+		out,
+		SNAPSHOT_NAME,
+		SNAPSHOT_EXTENSION,
 	)
-	copy_lib(lib_name) or_return
+	snapshot_path_cpy := strings.clone(snapshot_path, allocator)
 
-	// Match the names of the fields in Game_API to symbols in the game DLL
-	_, ok := dynlib.initialize_symbols(api, lib_name, "", "lib")
-	if !ok {
-		fmt.printfln(
-			"error: failed initializing symbols: {0}",
-			dynlib.last_error(),
+	// Copy version string
+	version: [APP_VERSION_SIZE]u8
+	n := min(len(app_version), APP_VERSION_SIZE)
+	copy(version[:n], app_version[:n])
+
+	hr = {
+		allocator = allocator,
+		snapshot_path = snapshot_path_cpy,
+		snapshot_header = {
+			magic_string = MAGIC_STRING,
+			version = HOT_RELOAD_VERSION,
+			app_version = version,
+			region_count = 0,
+		},
+		region_headers = make(map[string]Region_Header, 1, allocator), // initial capacity for nil checks
+		regions = make(map[string]Memory_Region, 1, allocator), // initial capacity for nil checks
+		write_full_snapshot = true,
+	}
+
+	return nil
+}
+
+hot_reload_destroy :: proc() {
+	assert(
+		hr.region_headers != nil,
+		"[hot-reload] destroying uninitialized data",
+	)
+
+	assert(hr.regions != nil, "[hot-reload] destroying uninitialized data")
+
+	delete(hr.snapshot_path, hr.allocator)
+
+	for key, region in hr.region_headers do delete(key, hr.allocator)
+	for key, region in hr.regions {
+		if region.digest != nil do delete(region.digest, hr.allocator)
+	}
+
+	delete(hr.region_headers)
+	delete(hr.regions)
+}
+
+// -----------------------------------------
+// Public functions
+
+register_region :: proc(
+	name: string,
+	ptr_location: rawptr,
+	data_size: u32,
+) -> os.Error {
+	assert(hr.region_headers != nil, "[hot-reload] uninitialized")
+	assert(hr.regions != nil, "[hot-reload] uninitialized")
+	assert(ptr_location != nil, "[hot_reload] invalid location")
+	assert(data_size > 0, "[hot_reload] invalid type size")
+
+	hash := fmt.tprintf("%v:%d", name, data_size)
+	assert(!(hash in hr.regions), "[hot_reload] double registration")
+	hash_cpy := strings.clone(hash, hr.allocator)
+	hr.region_headers[hash_cpy] = Region_Header {
+		name_size = cast(u32)len(name),
+		data_size = data_size,
+	}
+	hr.regions[hash_cpy] = Memory_Region {
+		ptr_location = ptr_location,
+	}
+
+	hr.snapshot_header.region_count += 1
+
+	hr.write_full_snapshot = true
+
+	return nil
+}
+
+read_snapshot :: proc() -> os.Error {
+	assert(hr.region_headers != nil, "[hot-reload] uninitialized")
+	assert(hr.regions != nil, "[hot-reload] uninitialized")
+
+	if !os.exists(hr.snapshot_path) {
+		hr.write_full_snapshot = true
+		return nil
+	}
+
+	snapshot := os.open(hr.snapshot_path, {.Read}) or_return
+	defer os.close(snapshot)
+
+	offset: i64
+
+	// Read snapshot header
+	snapshot_header: Snapshot_Header
+	header_bytes := mem.ptr_to_bytes(&snapshot_header)
+	os.read_at(snapshot, header_bytes, offset) or_return
+	offset += size_of(Snapshot_Header)
+	assert(
+		snapshot_header.magic_string == MAGIC_STRING,
+		"[hot-reload] unknown filetype",
+	)
+	assert(
+		snapshot_header.version == HOT_RELOAD_VERSION,
+		"[hot-reload] incompatible snapshot version",
+	)
+
+	region_header: Region_Header
+	for i in 0 ..< snapshot_header.region_count {
+
+		// Read region header
+		header_bytes := mem.ptr_to_bytes(&region_header)
+		os.read_at(snapshot, header_bytes, offset) or_return
+		offset += size_of(Region_Header)
+
+		// Read region name
+		name_bytes := make([]byte, region_header.name_size, hr.allocator)
+		defer delete(name_bytes, hr.allocator)
+		os.read_at(snapshot, name_bytes, offset) or_return
+		offset += cast(i64)region_header.name_size
+		name := transmute(string)name_bytes[:]
+
+		// Read region data
+		data_bytes := make([]byte, region_header.data_size, hr.allocator)
+		defer delete(data_bytes, hr.allocator)
+		os.read_at(snapshot, data_bytes, offset) or_return
+		offset += cast(i64)region_header.data_size
+
+		// Compare currently registered region with the loaded region
+		key := fmt.tprintf("%v:%d", name, region_header.data_size)
+		new_region_header, ok := hr.region_headers[key]
+		if !ok || region_header.data_size != new_region_header.data_size {
+			hr.write_full_snapshot = true
+			fmt.println("[hot-reload] bail loading region:", name)
+			continue
+		}
+
+		// Create digest and store in registered regions
+		digest := hash.hash_bytes(
+			hash.Algorithm.SHA256,
+			data_bytes,
+			hr.allocator,
 		)
-	} else {
-		// Odin's shared libraries don't register a constructor, so the lib's
-		// runtime init (@init procs like os.stdout setup) never runs on load.
-		// Call it explicitly.
-		// Windows doesn't need this: its dynamic build exports DllMain, which
-		// the OS calls on load and which runs _startup_runtime itself.
-		when ODIN_OS != .Windows {
-			Entry :: #type proc "c" () -> c.int
-			entry_ptr, entry_ok := dynlib.symbol_address(
-				api.lib,
-				"_odin_entry_point",
-			)
-			if entry_ok do (transmute(Entry)entry_ptr)()
-		}
-	}
+		region := &hr.regions[key]
+		region.digest = digest
 
-	return ok
-}
-
-// Unload game lib, used during full restarts
-unload_game_lib :: proc(api: ^Game_API) {
-	if api.lib != nil {
-		if !dynlib.unload_library(api.lib) {
-			fmt.eprintfln(
-				"error: failed unloading lib: {0}",
-				dynlib.last_error(),
-			)
-		}
-	}
-
-	if os.remove(
-		   fmt.tprintf(GAME_LIB_DIR + "game_{0}" + LIB_EXT, api.api_version),
-	   ) !=
-	   nil {
-		fmt.printfln(
-			"error: failed to remove {0}game_{1}{2} copy",
-			GAME_LIB_DIR,
-			api.api_version,
-			LIB_EXT,
+		// Write snapshot memory to the memory region
+		dest := mem.byte_slice(
+			region.ptr_location,
+			cast(int)region_header.data_size,
 		)
+		copy(dest, data_bytes)
 	}
+
+	return nil
 }
 
-reload_game_lib :: proc(hr: ^Hot_Reload) -> (lib: ^Game_API, err: Error) {
-	api := active_lib(hr)
-	force_reload := api.force_reload()
-	force_restart := api.force_restart()
-	reload := force_reload || force_restart
+// Next write will be a full memory snapshot
+set_write_full_snapshot :: proc() {
+	hr.write_full_snapshot = true
+}
 
-	lib_mod, lib_mod_err := os.last_write_time_by_name(GAME_LIB_PATH)
-	// TODO: Handle error
-	if lib_mod_err == os.ERROR_NONE && api.modification_time != lib_mod {
-		reload = true
-	}
+// Write memory snapshot, save on writes by diff-ing
+write_snapshot :: proc() -> os.Error {
+	assert(hr.region_headers != nil, "[hot-reload] uninitialized")
+	assert(hr.regions != nil, "[hot-reload] uninitialized")
 
-	if !reload do return api, nil
-
-	new_api: Game_API
-	new_api.api_version = api.api_version + 1
-	new_api_ok := load_game_lib(&new_api)
-	if !new_api_ok {
-		fmt.println("error: failed to load Game API")
-		return nil, .Load_Game_Lib_Failed
-	}
-
-	force_restart = force_restart || api.memory_size() != new_api.memory_size()
-
-	if !force_restart {
-		// This does the normal hot reload
-
-		// Note that we don't unload the old game APIs because that
-		// would unload the lib. The lib can contain stored info
-		// such as string literals. The old libs are only unloaded
-		// on a full reset or on shutdown.
-		memory := api.memory()
-		new_api.memory_set(memory)
+	snapshot: ^os.File
+	if hr.write_full_snapshot || !os.exists(hr.snapshot_path) {
+		snapshot = os.create(hr.snapshot_path) or_return
 	} else {
-		// This does a full reset. That's basically like opening and
-		// closing the game, without having to restart the executable.
-		//
-		// You end up in here if the game requests a full reset OR
-		// if the size of the game memory has changed. That would
-		// probably lead to a crash anyways.
+		snapshot = os.open(hr.snapshot_path, {.Read, .Write}) or_return
+	}
+	defer os.close(snapshot)
 
-		api.memory_free()
+	offset: i64
 
-		for &g in hr.loaded_libs {
-			unload_game_lib(&g)
+	// Write header
+	if hr.write_full_snapshot {
+		header_bytes := mem.ptr_to_bytes(&hr.snapshot_header)
+		n := os.write_at(snapshot, header_bytes, offset) or_return
+	}
+	offset += size_of(Snapshot_Header)
+
+	for key, &region in hr.regions {
+		header := hr.region_headers[key]
+
+		// Write region header
+		if hr.write_full_snapshot {
+			header_bytes := mem.ptr_to_bytes(&header)
+			os.write_at(snapshot, header_bytes, offset) or_return
 		}
-		clear(&hr.loaded_libs)
+		offset += size_of(Region_Header)
 
-		new_api.init()
+		// Write region name
+		if hr.write_full_snapshot {
+			name := key[:header.name_size] // get name from first part of the hash
+			name_bytes := transmute([]byte)name
+			os.write_at(snapshot, name_bytes, offset) or_return
+		}
+		offset += cast(i64)header.name_size
+
+		// Write region data (if bytes differ)
+		data_bytes := mem.byte_slice(region.ptr_location, header.data_size)
+		digest := hash.hash_bytes(
+			hash.Algorithm.SHA256,
+			data_bytes,
+			hr.allocator,
+		)
+		if hr.write_full_snapshot || mem.compare(digest, region.digest) != 0 {
+			delete(region.digest, hr.allocator)
+			region.digest = digest
+			os.write_at(snapshot, data_bytes, offset) or_return
+		} else {
+			delete(digest, hr.allocator)
+		}
+		offset += cast(i64)header.data_size
 	}
 
-	append(&hr.loaded_libs, new_api)
+	hr.write_full_snapshot = false
 
-	return active_lib(hr), nil
+	return nil
+}
+
+force_reload :: proc() {
+	should_close = true
+}
+
+force_restart :: proc() -> os.Error {
+	should_close = true
+	os.remove(hr.snapshot_path) or_return
+
+	return nil
 }

src/base/types.odin

@@ -0,0 +1,17 @@
+package base
+
+// -----------------------------------------
+// Types
+
+Vec2 :: [2]f32
+Vec3 :: [3]f32
+Vec4 :: [4]f32
+
+Mat3 :: matrix[3, 3]f32
+Mat4 :: matrix[4, 4]f32
+
+Vertex :: struct #align (4) {
+	pos: Vec3,
+	col: Vec3,
+	uv:  Vec2, // texture coordinate
+}

src/core/api.odin

@@ -0,0 +1,18 @@
+package core
+
+import "sindri:base"
+
+// -----------------------------------------
+// Types
+
+Game_API :: struct {
+	settings:      proc() -> base.Settings,
+	init_once:     proc(),
+	init:          proc(),
+	update:        proc(dt: f32),
+	render:        proc(),
+	destroy:       proc(),
+	should_close:  proc() -> bool,
+	force_reload:  proc() -> bool,
+	force_restart: proc() -> bool,
+}

src/core/assets.odin

@@ -0,0 +1,80 @@
+package core
+
+import "base:runtime"
+import "core:fmt"
+
+import "sindri:base"
+
+// -----------------------------------------
+// Types
+
+Model :: struct {
+	vertices: []base.Vertex,
+	indices:  []u16,
+	// Some file formats embed their texture
+	// texture: ^Texture2D,
+}
+
+Texture :: struct {
+	width:           u32,
+	height:          u32,
+	id:              u32,
+	internal_format: u32,
+	data_format:     u32,
+	data_type:       u32,
+}
+
+Assets :: struct {
+	allocator:    runtime.Allocator,
+	model_list:   map[string]Model,
+	texture_list: map[string]Texture,
+}
+
+// -----------------------------------------
+// Constructor/destructor
+
+assets_init :: proc(allocator := context.allocator) -> Assets {
+	return {
+		allocator = allocator,
+		model_list = make(map[string]Model, allocator),
+		texture_list = make(map[string]Texture, allocator),
+	}
+}
+
+assets_destroy :: proc(a: ^Assets) {
+	for _, &model in a.model_list {
+		delete(model.vertices, a.allocator)
+		delete(model.indices, a.allocator)
+	}
+
+	for _, &texture in a.texture_list {
+	}
+
+	delete(a.model_list)
+	delete(a.texture_list)
+}
+
+// -----------------------------------------
+// Public functions
+
+load_model :: proc(a: ^Assets, path: string) -> ^Model {
+	if path in a.model_list do return &a.model_list[path]
+
+	vertices, indices, ok := load_obj_model(path, a.allocator)
+	fmt.assertf(ok, "[assets] failed to read model: %s", path)
+
+	a.model_list[path] = {
+		vertices = vertices,
+		indices  = indices,
+	}
+
+	return &a.model_list[path]
+}
+
+// Batching:
+// max_vertices 60k
+// max_elements 60k
+// max_texture_slots 32, query gpu or can wgpu do a larger buffer?
+
+// Scene load: loop through all models, add all model sizes together,
+// then create a vertex_buffer using the max size, storing the index somewhere.

src/core/obj.odin

@@ -0,0 +1,149 @@
+package core
+
+import "core:fmt"
+import "core:math/linalg"
+import "core:os"
+import "core:strconv"
+import "core:strings"
+
+import "sindri:base"
+
+// Minimal OBJ loader: reads v, vt, vn and triangulates convex polygon faces.
+// Produces one GPU vertex per face corner, then centers and normalizes the
+// model so it fits roughly inside a [-1, 1] cube at the origin
+load_obj_model :: proc(
+	path: string,
+	allocator := context.allocator,
+) -> (
+	vertices: []base.Vertex,
+	indices: []u16,
+	ok: bool,
+) {
+	data, err := os.read_entire_file_from_path(path, allocator)
+	if err != os.ERROR_NONE {
+		fmt.eprintfln("[obj] failed to read model: %s", path)
+		return nil, nil, false
+	}
+	defer delete(data)
+
+	positions: [dynamic]base.Vec3
+	uvs: [dynamic]base.Vec2
+	normals: [dynamic]base.Vec3
+	temp_vertices: [dynamic]base.Vertex
+	temp_indices: [dynamic]u16
+	defer {
+		delete(positions)
+		delete(uvs)
+		delete(normals)
+		delete(temp_vertices)
+		delete(temp_indices)
+	}
+
+	text := string(data)
+	for line in strings.split_lines_iterator(&text) {
+		trimmed := strings.trim_space(line)
+		if len(trimmed) == 0 || trimmed[0] == '#' do continue
+
+		fields := strings.fields(trimmed)
+		defer delete(fields)
+		if len(fields) == 0 do continue
+
+		switch fields[0] {
+			case "v":
+				if len(fields) < 4 do continue
+				x, _ := strconv.parse_f32(fields[1])
+				y, _ := strconv.parse_f32(fields[2])
+				z, _ := strconv.parse_f32(fields[3])
+				append(&positions, base.Vec3{x, y, z})
+			case "vt":
+				if len(fields) < 3 do continue
+				u, _ := strconv.parse_f32(fields[1])
+				v, _ := strconv.parse_f32(fields[2])
+				append(&uvs, base.Vec2{u, v})
+			case "vn":
+				if len(fields) < 4 do continue
+				x, _ := strconv.parse_f32(fields[1])
+				y, _ := strconv.parse_f32(fields[2])
+				z, _ := strconv.parse_f32(fields[3])
+				append(&normals, base.Vec3{x, y, z})
+			case "f":
+				face_indices: [dynamic]u16
+				defer delete(face_indices)
+
+				for i := 1; i < len(fields); i += 1 {
+					token := fields[i]
+					slash := strings.index_byte(token, '/')
+
+					vi_str := token
+					vti_str := ""
+					if slash != -1 {
+						vi_str = token[:slash]
+						slash2 := strings.index_byte(token[slash + 1:], '/')
+						if slash2 != -1 {
+							vti_str = token[slash + 1:slash + 1 + slash2]
+						} else {
+							vti_str = token[slash + 1:]
+						}
+					}
+
+					vi, _ := strconv.parse_int(vi_str)
+					vi -= 1 // OBJ indices are 1-based
+					if vi < 0 || vi >= len(positions) do continue
+
+					uv := base.Vec2{0, 0}
+					if len(vti_str) > 0 {
+						vti, _ := strconv.parse_int(vti_str)
+						vti -= 1
+						if vti >= 0 && vti < len(uvs) {
+							uv = uvs[vti]
+						}
+					} else if vi < len(uvs) {
+						uv = uvs[vi]
+					}
+
+					append(
+						&temp_vertices,
+						base.Vertex {
+							pos = positions[vi],
+							col = {1, 1, 1},
+							uv = uv,
+						},
+					)
+					append(&face_indices, cast(u16)(len(temp_vertices) - 1))
+				}
+
+				// Triangulate convex polygon by fanning from the first vertex
+				for i := 2; i < len(face_indices); i += 1 {
+					append(&temp_indices, face_indices[0])
+					append(&temp_indices, face_indices[i - 1])
+					append(&temp_indices, face_indices[i])
+				}
+		}
+	}
+
+	if len(temp_vertices) == 0 {
+		return nil, nil, false
+	}
+
+	// Center and normalize: fit the model inside a roughly [-1, 1] cube
+	min_p := temp_vertices[0].pos
+	max_p := temp_vertices[0].pos
+	for v in temp_vertices {
+		min_p = linalg.min(min_p, v.pos)
+		max_p = linalg.max(max_p, v.pos)
+	}
+	center := (min_p + max_p) * 0.5
+	size := max_p - min_p
+	max_size := max(size.x, size.y, size.z)
+	scale := 1.8 / max_size
+
+	for &v in temp_vertices {
+		v.pos = (v.pos - center) * scale
+	}
+
+	vertices = make([]base.Vertex, len(temp_vertices), allocator)
+	indices = make([]u16, len(temp_indices), allocator)
+	copy(vertices, temp_vertices[:])
+	copy(indices, temp_indices[:])
+	return vertices, indices, true
+}

src/main.odin

@@ -3,7 +3,9 @@ package sindri
 import "core:fmt"
 import "core:time"
 
+import "game:game"
 import "sindri:base"
+import "sindri:core"
 import "sindri:platform"
 
 VERSION :: #config(VERSION, "dev")
@@ -14,8 +16,13 @@ main :: proc() {
 	fmt.println("hello world!", VERSION)
 
 	// Hot reload development functionality
-	hr, err := base.hot_reload_init()
-	defer base.hot_reload_destroy(&hr)
+	base.hot_reload_init(VERSION)
+	defer base.hot_reload_destroy()
+
+	// Load game API & settings
+	api := game.api()
+	defer api.destroy()
+	settings := api.settings()
 
 	// Event system
 	base.event_bus_init()
@@ -23,8 +30,9 @@ main :: proc() {
 
 	base.event_subscribe(base.Key_Press_Event, test)
 
-	api := base.active_lib(&hr)
-	settings := api.settings()
+	// Listen for OS signals (SIGINT, SIGTERM)
+	platform.signals_init()
+	defer platform.signals_destroy()
 
 	// Initialize Window
 	platform.os_init(settings)
@@ -34,34 +42,76 @@ main :: proc() {
 	// Initialize GPU resources
 	platform.instance_init(settings)
 	defer platform.instance_destroy()
+	load_test_model()
 
 	api.init_once()
+
+	base.read_snapshot()
+
 	api.init()
 
-	gt: f64 = 0
-	dt: f32
+	dt: f64
+	gt: f64
+	st: f64
+
+	for !api.should_close() &&
+	    !platform.os_should_close() &&
+	    !base.should_close {
 
-	for !platform.os_should_close() && !base.should_close(&hr) {
 		start := time.tick_now()
 
 		platform.os_poll_events()
 		base.drain_event_queue()
-		api.update(dt)
+		api.update(cast(f32)dt)
+		base.write_snapshot()
 
-		platform.frame(dt)
+		platform.frame()
+		api.render()
 
-		dt = f32(time.duration_seconds(time.tick_since(start)))
-		gt += f64(dt)
+		dt = time.duration_seconds(time.tick_since(start))
+		gt += dt
+		st += dt
 
-		// Hot reload
-		api, err = base.reload_game_lib(&hr)
-		if err != nil do break
+		if st > 5 {
+			st -= 5
+			base.set_write_full_snapshot()
+		}
+
+		if api.force_reload() do base.force_reload()
+		if api.force_restart() do base.force_restart()
 	}
-
-	api.destroy()
 }
 
 test :: proc(e: ^base.Key_Press_Event, _: rawptr) -> bool {
 	fmt.println("main: @@@@@@@@@@@", e)
 	return true
 }
+
+// Load model from disk and upload it
+load_test_model :: proc() {
+	assets := core.assets_init()
+	defer core.assets_destroy(&assets)
+
+	cube := core.load_model(&assets, "assets/cube.obj")
+	suzanne := core.load_model(&assets, "assets/suzanne.obj")
+
+	platform.create_material("dummy")
+	platform.create_renderable(
+		"assets/cube.obj",
+		cube.vertices,
+		cube.indices,
+		0,
+	)
+	platform.create_renderable(
+		"assets/suzanne.obj",
+		suzanne.vertices,
+		suzanne.indices,
+		3,
+	)
+	platform.create_renderable(
+		"assets/suzanne.obj",
+		suzanne.vertices,
+		suzanne.indices,
+		-3,
+	)
+}

src/platform/glfw.odin

@@ -1,5 +1,6 @@
 package platform
 
+import "base:intrinsics"
 import "core:fmt"
 import "core:strings"
 import "vendor:glfw"
@@ -20,9 +21,7 @@ OS :: struct {
 // Constructor / destructor
 
 os_init :: proc(settings: base.Settings) {
-	if !glfw.Init() {
-		panic("[glfw] init failure")
-	}
+	assert(cast(bool)glfw.Init(), "[glfw] init failure")
 
 	// Set window properties
 	glfw.WindowHint(glfw.CLIENT_API, glfw.NO_API) // do not create OpenGL context
@@ -113,7 +112,8 @@ os_set_callback_proc :: proc(window: rawptr) {
 }
 
 os_should_close :: proc() -> bool {
-	return bool(glfw.WindowShouldClose(state.os.window))
+	window_close := bool(glfw.WindowShouldClose(state.os.window))
+	return window_close || intrinsics.atomic_load(&quit_signal_received)
 }
 
 os_set_should_close :: proc(val: bool) {

src/platform/signals.odin

@@ -0,0 +1,48 @@
+package platform
+
+import "base:intrinsics"
+import "core:c/libc"
+import "core:fmt"
+
+// -----------------------------------------
+// Variables
+
+// Read with atomic_load, safe across threads / interrupt contexts
+quit_signal_received: bool
+
+// -----------------------------------------
+// Public functions
+
+// Register signal handlers
+signals_init :: proc() {
+	// SIGINT = Interrupt, typically Ctrl+C
+	if libc.signal(libc.SIGINT, signal_handler) ==
+	   cast(proc "c" (_: i32))libc.SIG_ERR {
+		fmt.eprintln("error: failed to register SIGINT handler")
+	}
+
+	// SIGTERM = Normal termination
+	if libc.signal(libc.SIGTERM, signal_handler) ==
+	   cast(proc "c" (_: i32))libc.SIG_ERR {
+		fmt.eprintln("error: failed to register SIGTERM handler")
+	}
+}
+
+// Restore default signal handlers
+signals_destroy :: proc() {
+	libc.signal(libc.SIGINT, cast(proc "c" (_: i32))libc.SIG_DFL)
+	libc.signal(libc.SIGTERM, cast(proc "c" (_: i32))libc.SIG_DFL)
+}
+
+@(private = "file")
+signal_handler :: proc "c" (sig: i32) {
+	switch sig {
+		case libc.SIGINT:
+			fallthrough
+		case libc.SIGTERM:
+			intrinsics.atomic_store(&quit_signal_received, true)
+		case:
+			context = state.ctx
+			panic("[signal] unhandled signal type")
+	}
+}

src/platform/wgpu.odin

@@ -2,40 +2,103 @@ package platform
 
 import "base:runtime"
 import "core:fmt"
+import "core:math"
+import "core:math/linalg"
+import "core:os"
 import "core:slice"
 
 import "wgpu:wgpu"
 
 import "sindri:base"
 
+// -----------------------------------------
+// Types
+
+// Updated once per frame
+Camera_Uniform :: struct {
+	mvp: base.Mat4,
+}
+
+// Updated once per material
+Material_Uniform :: struct {
+	dummy: f32,
+}
+
+// Updated once per mesh
+Object_Uniform :: struct {
+	transform: base.Mat4,
+}
+
+Material :: struct {
+	bind_group:     wgpu.BindGroup,
+	uniform_buffer: wgpu.Buffer,
+}
+
+Object :: struct {
+	name:           string,
+	bind_group:     wgpu.BindGroup,
+	uniform_buffer: wgpu.Buffer,
+}
+
+Mesh :: struct {
+	vertex_buffer: wgpu.Buffer,
+	index_buffer:  wgpu.Buffer,
+	index_count:   u32,
+}
+
 // -----------------------------------------
 // Variables
 
 // Instance -> Surface -> Adapter -> Device -> Queue
 state: struct {
-	ctx:             runtime.Context,
-	os:              OS,
+	ctx:                        runtime.Context,
+	os:                         OS,
 	// ----------------------------------------
-	instance:        wgpu.Instance, // entry point: creates Adapter, Device and Surface
-	surface:         wgpu.Surface, // handle to a presentable surface (e.g. a window)
-	adapter:         wgpu.Adapter, // handle to physical GPU
-	device:          wgpu.Device, // open connection to a GPU
-	queue:           wgpu.Queue, // handle to command queue on a Device
-	config:          wgpu.SurfaceConfiguration,
-	module:          wgpu.ShaderModule,
-	pipeline_layout: wgpu.PipelineLayout,
-	pipeline:        wgpu.RenderPipeline,
+	instance:                   wgpu.Instance, // entry point: creates Adapter, Device and Surface
+	surface:                    wgpu.Surface, // handle to a presentable surface (e.g. a window)
+	adapter:                    wgpu.Adapter, // handle to physical GPU
+	device:                     wgpu.Device, // open connection to a GPU
+	queue:                      wgpu.Queue, // handle to command queue on a Device
+	config:                     wgpu.SurfaceConfiguration,
+	module:                     wgpu.ShaderModule,
+	pipeline_layout:            wgpu.PipelineLayout,
+	pipeline:                   wgpu.RenderPipeline,
 	// ----------------------------------------
-	capabilities:    wgpu.SurfaceCapabilities,
-	vsync:           bool,
+	capabilities:               wgpu.SurfaceCapabilities,
+	vsync:                      bool,
+	// ----------------------------------------
+	depth_texture:              wgpu.Texture,
+	depth_texture_view:         wgpu.TextureView,
+	// ----------------------------------------
+	camera_uniform_buffer:      wgpu.Buffer,
+	camera_bind_group_layout:   wgpu.BindGroupLayout,
+	camera_bind_group:          wgpu.BindGroup,
+	// ----------------------------------------
+	material_bind_group_layout: wgpu.BindGroupLayout,
+	materials:                  map[string]Material,
+	// ----------------------------------------
+	objects_bind_group_layout:  wgpu.BindGroupLayout,
+	objects:                    [dynamic]Object,
+	meshes:                     map[string]Mesh,
+	// ----------------------------------------
+	diffuse_texture:            wgpu.Texture,
+	diffuse_texture_view:       wgpu.TextureView,
+	diffuse_sampler:            wgpu.Sampler,
 }
 
 // -----------------------------------------
 // Constructor/destructor
 
-instance_init :: proc(settings: base.Settings) {
+instance_init :: proc(
+	settings: base.Settings,
+	allocator := context.allocator,
+) {
 	state.ctx = context
 
+	state.materials = make(map[string]Material, allocator)
+	state.objects = make([dynamic]Object, allocator)
+	state.meshes = make(map[string]Mesh, allocator)
+
 	wgpu.SetLogCallback(log_callback, nil)
 	wgpu.SetLogLevel(.Warn)
 
@@ -64,6 +127,42 @@ instance_init :: proc(settings: base.Settings) {
 }
 
 instance_destroy :: proc() {
+	wgpu.TextureViewRelease(state.depth_texture_view)
+	wgpu.TextureRelease(state.depth_texture)
+
+	wgpu.SamplerRelease(state.diffuse_sampler)
+	wgpu.TextureViewRelease(state.diffuse_texture_view)
+	wgpu.TextureRelease(state.diffuse_texture)
+
+	wgpu.BufferRelease(state.camera_uniform_buffer)
+	wgpu.BindGroupRelease(state.camera_bind_group)
+	wgpu.BindGroupLayoutRelease(state.camera_bind_group_layout)
+
+	if state.materials != nil {
+		for _, m in state.materials {
+			wgpu.BufferRelease(m.uniform_buffer)
+			wgpu.BindGroupRelease(m.bind_group)
+		}
+		delete(state.materials)
+	}
+	wgpu.BindGroupLayoutRelease(state.material_bind_group_layout)
+
+	if state.meshes != nil {
+		for _, m in state.meshes {
+			wgpu.BufferRelease(m.vertex_buffer)
+			wgpu.BufferRelease(m.index_buffer)
+		}
+		delete(state.meshes)
+	}
+	if state.objects != nil {
+		for r in state.objects {
+			wgpu.BufferRelease(r.uniform_buffer)
+			wgpu.BindGroupRelease(r.bind_group)
+		}
+		delete(state.objects)
+	}
+	wgpu.BindGroupLayoutRelease(state.objects_bind_group_layout)
+
 	wgpu.RenderPipelineRelease(state.pipeline)
 	wgpu.PipelineLayoutRelease(state.pipeline_layout)
 	wgpu.ShaderModuleRelease(state.module)
@@ -94,9 +193,18 @@ resize :: proc "c" () {
 
 	state.config.width, state.config.height = os_get_framebuffer_size()
 	wgpu.SurfaceConfigure(state.surface, &state.config)
+
+	create_depth_texture()
+
+	// The projection depends on aspect, so rebuild and re-upload the matrix
+	upload_camera(
+		state.queue,
+		state.camera_uniform_buffer,
+		framebuffer_aspect(),
+	)
 }
 
-frame :: proc "c" (dt: f32) {
+frame :: proc "c" () {
 	context = state.ctx
 
 	surface_texture := wgpu.SurfaceGetCurrentTexture(state.surface)
@@ -137,20 +245,74 @@ frame :: proc "c" (dt: f32) {
 				loadOp = .Clear,
 				storeOp = .Store,
 				depthSlice = wgpu.DEPTH_SLICE_UNDEFINED,
-				clearValue = {0, 1, 0, 1},
+				clearValue = {55 / 255.0, 73 / 255.0, 73 / 255.0, 1},
+			},
+			depthStencilAttachment = &wgpu.RenderPassDepthStencilAttachment {
+				view = state.depth_texture_view,
+				depthLoadOp = .Clear,
+				depthStoreOp = .Store,
+				depthClearValue = 1.0,
 			},
 		},
 	)
 
 	wgpu.RenderPassEncoderSetPipeline(render_pass_encoder, state.pipeline)
-	wgpu.RenderPassEncoderDraw(
+
+	// Uniform group 0, camera MVP matrix
+	wgpu.RenderPassEncoderSetBindGroup(
 		render_pass_encoder,
-		vertexCount = 3,
-		instanceCount = 1,
-		firstVertex = 0,
-		firstInstance = 0,
+		0,
+		state.camera_bind_group,
+		dynamicOffsets = nil, // reuse bind group af different byte offsets, per binding
 	)
 
+	// Uniform group 1, materials
+	m := state.materials["dummy"]
+	wgpu.RenderPassEncoderSetBindGroup(
+		render_pass_encoder,
+		1,
+		m.bind_group,
+		dynamicOffsets = nil, // reuse bind group af different byte offsets, per binding
+	)
+
+	// Render all objects
+	for o in state.objects {
+		m := state.meshes[o.name]
+
+		// Uniform group 2, object
+		wgpu.RenderPassEncoderSetBindGroup(
+			render_pass_encoder,
+			2,
+			o.bind_group,
+			dynamicOffsets = nil, // reuse bind group af different byte offsets, per binding
+		)
+
+		wgpu.RenderPassEncoderSetVertexBuffer(
+			render_pass_encoder,
+			slot = 0,
+			buffer = m.vertex_buffer,
+			offset = 0, // offset into buffer to start from
+			size = wgpu.WHOLE_SIZE, // x bytes of the buffer to use
+		)
+
+		wgpu.RenderPassEncoderSetIndexBuffer(
+			render_pass_encoder,
+			buffer = m.index_buffer,
+			format = .Uint16, // type of each element in the buffer
+			offset = 0, // offset into buffer to start from
+			size = wgpu.WHOLE_SIZE, // x bytes of the buffer to use
+		)
+
+		wgpu.RenderPassEncoderDrawIndexed(
+			render_pass_encoder,
+			m.index_count,
+			instanceCount = 1, // draw x instance(s) of the mesh
+			firstIndex = 0, // offset into buffer to start from, useful for drawing sub-mesh
+			baseVertex = 0, // value added to index before vertex fetch, useful for multi-mesh vertex buffers
+			firstInstance = 0, // number to start instance index from
+		)
+	}
+
 	wgpu.RenderPassEncoderEnd(render_pass_encoder)
 	wgpu.RenderPassEncoderRelease(render_pass_encoder)
 
@@ -161,6 +323,152 @@ frame :: proc "c" (dt: f32) {
 	wgpu.SurfacePresent(state.surface)
 }
 
+create_material :: proc(name: string) {
+	if name in state.materials do return
+
+	uniform_buffer := wgpu.DeviceCreateBuffer(
+		state.device,
+		&{
+			label = "material uniform",
+			usage = {.Uniform, .CopyDst}, // shader reads, queue writes
+			size  = cast(u64)size_of(Material_Uniform),
+		},
+	)
+
+	uniform := Material_Uniform{}
+
+	// bufferOffset = offset into buffer to start from
+	wgpu.QueueWriteBuffer(
+		state.queue,
+		uniform_buffer,
+		0,
+		&uniform,
+		size_of(Material_Uniform),
+	)
+
+	entries := [?]wgpu.BindGroupEntry {
+		{
+			binding = 0, // slot 0
+			buffer  = uniform_buffer,
+			offset  = 0, // offset into buffer to start from
+			size    = cast(u64)size_of(Material_Uniform),
+		},
+	}
+	bind_group := wgpu.DeviceCreateBindGroup(
+		state.device,
+		&{
+			label = "material bind group",
+			layout = state.material_bind_group_layout,
+			entryCount = len(entries),
+			entries = raw_data(entries[:]),
+		},
+	)
+
+	state.materials[name] = {
+		bind_group     = bind_group,
+		uniform_buffer = uniform_buffer,
+	}
+}
+
+create_renderable :: proc(
+	name: string,
+	vertices: []base.Vertex,
+	indices: []u16,
+	x_offset: f32,
+) {
+	uniform_buffer := wgpu.DeviceCreateBuffer(
+		state.device,
+		&{
+			label = "object uniform",
+			usage = {.Uniform, .CopyDst}, // shader reads, queue writes
+			size  = cast(u64)size_of(Object_Uniform),
+		},
+	)
+
+	uniform := Object_Uniform {
+		// transform = linalg.identity(base.Mat4)
+		transform = linalg.matrix4_translate(base.Vec3{x_offset, 0, 0}),
+	}
+
+	// bufferOffset = offset into buffer to start from
+	wgpu.QueueWriteBuffer(
+		state.queue,
+		uniform_buffer,
+		0,
+		&uniform,
+		size_of(Object_Uniform),
+	)
+
+	entries := [?]wgpu.BindGroupEntry {
+		{
+			binding = 0, // slot 0
+			buffer  = uniform_buffer,
+			offset  = 0, // offset into buffer to start from
+			size    = cast(u64)size_of(Object_Uniform),
+		},
+	}
+	bind_group := wgpu.DeviceCreateBindGroup(
+		state.device,
+		&{
+			label = "object bind group",
+			layout = state.objects_bind_group_layout,
+			entryCount = len(entries),
+			entries = raw_data(entries[:]),
+		},
+	)
+
+	append(
+		&state.objects,
+		Object {
+			name = name,
+			bind_group = bind_group,
+			uniform_buffer = uniform_buffer,
+		},
+	)
+
+	if name in state.meshes do return
+
+	vertex_buffer := wgpu.DeviceCreateBuffer(
+		state.device,
+		&{
+			label = "vertex buffer",
+			usage = {.Vertex, .CopyDst}, // shader reads, queue writes
+			size  = cast(u64)(len(vertices) * size_of(base.Vertex)),
+		},
+	)
+
+	wgpu.QueueWriteBuffer(
+		state.queue,
+		vertex_buffer,
+		0,
+		raw_data(vertices),
+		cast(uint)(len(vertices) * size_of(base.Vertex)),
+	)
+
+	index_buffer := wgpu.DeviceCreateBuffer(
+		state.device,
+		&{
+			label = "index buffer",
+			usage = {.Index, .CopyDst}, // shader reads, queue writes
+			size  = cast(u64)(len(indices) * size_of(u16)),
+		},
+	)
+
+	wgpu.QueueWriteBuffer(
+		state.queue,
+		index_buffer,
+		0,
+		raw_data(indices),
+		cast(uint)(len(indices) * size_of(u16)),
+	)
+
+	state.meshes[name] = {
+		vertex_buffer = vertex_buffer,
+		index_buffer  = index_buffer,
+		index_count   = cast(u32)len(indices),
+	}
+}
+
 // -----------------------------------------
 // Private functions
 
@@ -208,18 +516,70 @@ on_device :: proc "c" (
 	}
 	wgpu.SurfaceConfigure(state.surface, &state.config)
 
-	shader :: `
+	// ----------------------------------------
+	// Depth buffer
+
+	create_depth_texture()
+
+	// ----------------------------------------
+	// Compile shader
+
+	uniforms_struct := to_wgsl_struct(Camera_Uniform, "Camera")
+	defer delete(uniforms_struct)
+	vertex_input_struct := to_wgsl_struct(
+		base.Vertex,
+		"VertexInput",
+		locations = true,
+	)
+	defer delete(vertex_input_struct)
+
+	material_struct := to_wgsl_struct(Material_Uniform, "Material")
+	defer delete(material_struct)
+
+	renderable_struct := to_wgsl_struct(Object_Uniform, "Renderable")
+	defer delete(renderable_struct)
+
+	shader := fmt.tprintf(
+		`
+	%s
+	%s
+	%s
+
+	@group(0) @binding(0) var<uniform> c: Camera;
+	@group(0) @binding(1) var t_diffuse: texture_2d<f32>;
+	@group(0) @binding(2) var s_diffuse: sampler;
+
+	@group(1) @binding(0) var<uniform> m: Material;
+
+	@group(2) @binding(0) var<uniform> r: Renderable;
+
+	%s
+
+	struct VertexOutput {{
+		@builtin(position) position: vec4<f32>,
+		@location(0) col: vec3<f32>,
+		@location(1) uv: vec2<f32>,
+	}};
+
 	@vertex
-	fn vs_main(@builtin(vertex_index) in_vertex_index: u32) -> @builtin(position) vec4<f32> {
-		let x = f32(i32(in_vertex_index) - 1);
-		let y = f32(i32(in_vertex_index & 1u) * 2 - 1);
-		return vec4<f32>(x, y, 0.0, 1.0);
-	}
+	fn vs_main(in: VertexInput) -> VertexOutput {{
+		var out: VertexOutput;
+		out.position = c.mvp * r.transform * vec4<f32>(in.pos, 1.0);
+		out.col = in.col;
+		out.uv = in.uv;
+		return out;
+	}}
 
 	@fragment
-	fn fs_main() -> @location(0) vec4<f32> {
-		return vec4<f32>(1.0, 0.0, 0.0, 1.0);
-	}`
+	fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {{
+		return textureSample(t_diffuse, s_diffuse, in.uv) * vec4<f32>(in.col, 1.0);
+	}}
+	`,
+		uniforms_struct,
+		material_struct,
+		renderable_struct,
+		vertex_input_struct,
+	)
 
 	state.module = wgpu.DeviceCreateShaderModule(
 		state.device,
@@ -231,12 +591,140 @@ on_device :: proc "c" (
 		},
 	)
 
-	state.pipeline_layout = wgpu.DeviceCreatePipelineLayout(state.device, &{})
+	// ----------------------------------------
+	// Camera uniform: buffer, then the baked layout it will be read through
+
+	state.camera_uniform_buffer = wgpu.DeviceCreateBuffer(
+		state.device,
+		&{
+			label = "camera uniform",
+			usage = {.Uniform, .CopyDst}, // shader reads, queue writes
+			size  = cast(u64)size_of(Camera_Uniform),
+		},
+	)
+
+	camera_layout_entries := [?]wgpu.BindGroupLayoutEntry {
+		{
+			binding = 0, // slot 0
+			visibility = {.Vertex},
+			buffer = {
+				type = .Uniform,
+				minBindingSize = cast(u64)size_of(Camera_Uniform),
+			},
+		},
+		{
+			binding = 1, // slot 1
+			visibility = {.Fragment},
+			texture = {
+				sampleType = .Float,
+				viewDimension = ._2D,
+				multisampled = false,
+			},
+		},
+		{
+			binding = 2, // slot 2
+			visibility = {.Fragment},
+			sampler = {type = .Filtering},
+		},
+	}
+	state.camera_bind_group_layout = wgpu.DeviceCreateBindGroupLayout(
+		state.device,
+		&{
+			label = "camera layout",
+			entryCount = len(camera_layout_entries),
+			entries = raw_data(camera_layout_entries[:]),
+		},
+	)
+
+	// ----------------------------------------
+	// Material baked layout
+
+	material_layout_entries := [?]wgpu.BindGroupLayoutEntry {
+		{
+			binding = 0, // slot 0
+			visibility = {.Fragment},
+			buffer = {
+				type = .Uniform,
+				minBindingSize = cast(u64)size_of(Material_Uniform),
+			},
+		},
+	}
+	state.material_bind_group_layout = wgpu.DeviceCreateBindGroupLayout(
+		state.device,
+		&{
+			label = "material layout",
+			entryCount = len(material_layout_entries),
+			entries = raw_data(material_layout_entries[:]),
+		},
+	)
+
+	// ----------------------------------------
+	// Renderable baked layout
+
+	renderable_layout_entries := [?]wgpu.BindGroupLayoutEntry {
+		{
+			binding = 0, // slot 0
+			visibility = {.Vertex},
+			buffer = {
+				type = .Uniform,
+				minBindingSize = cast(u64)size_of(Object_Uniform),
+			},
+		},
+	}
+	state.objects_bind_group_layout = wgpu.DeviceCreateBindGroupLayout(
+		state.device,
+		&{
+			label = "renderable layout",
+			entryCount = len(renderable_layout_entries),
+			entries = raw_data(renderable_layout_entries[:]),
+		},
+	)
+
+	// ----------------------------------------
+	// Diffuse texture + sampler
+
+	state.diffuse_texture, state.diffuse_texture_view, state.diffuse_sampler =
+		create_diffuse_texture(state.device, state.queue)
+
+	// ----------------------------------------
+	// Buffer shape
+
+	vertex_attributes := to_vertex_attributes(base.Vertex)
+
+	vertex_layout := wgpu.VertexBufferLayout {
+			stepMode       = .Vertex,
+			arrayStride    = size_of(base.Vertex),
+			attributeCount = len(vertex_attributes),
+			attributes     = raw_data(vertex_attributes),
+		}
+
+	// ----------------------------------------
+	// Render pipeline
+
+	group_layouts := [?]wgpu.BindGroupLayout {
+		state.camera_bind_group_layout,
+		state.material_bind_group_layout,
+		state.objects_bind_group_layout,
+	}
+	state.pipeline_layout = wgpu.DeviceCreatePipelineLayout(
+		state.device,
+		&{
+			bindGroupLayoutCount = len(group_layouts),
+			bindGroupLayouts = raw_data(group_layouts[:]),
+		},
+	)
+
 	state.pipeline = wgpu.DeviceCreateRenderPipeline(
 		state.device,
 		&{
+			label = "pipeline",
 			layout = state.pipeline_layout,
-			vertex = {module = state.module, entryPoint = "vs_main"},
+			vertex = {
+				module = state.module,
+				entryPoint = "vs_main",
+				bufferCount = 1,
+				buffers = &vertex_layout,
+			},
 			fragment = &{
 				module = state.module,
 				entryPoint = "fs_main",
@@ -248,8 +736,43 @@ on_device :: proc "c" (
 			},
 			primitive = {topology = .TriangleList},
 			multisample = {count = 1, mask = 0xFFFFFFFF},
+			depthStencil = &wgpu.DepthStencilState {
+				format = .Depth24Plus,
+				depthWriteEnabled = .True,
+				depthCompare = .Less,
+			},
 		},
 	)
+
+	// ----------------------------------------
+	// Camera bind group
+
+	bind_group_entries := [?]wgpu.BindGroupEntry {
+		{
+			binding = 0, // slot 0
+			buffer  = state.camera_uniform_buffer,
+			offset  = 0, // offset into buffer to start from
+			size    = cast(u64)size_of(Camera_Uniform),
+		},
+		{binding = 1, textureView = state.diffuse_texture_view},
+		{binding = 2, sampler = state.diffuse_sampler},
+	}
+	state.camera_bind_group = wgpu.DeviceCreateBindGroup(
+		state.device,
+		&{
+			label = "camera bind group",
+			layout = state.camera_bind_group_layout,
+			entryCount = len(bind_group_entries),
+			entries = raw_data(bind_group_entries[:]),
+		},
+	)
+
+	// Initial upload of the matrix
+	upload_camera(
+		state.queue,
+		state.camera_uniform_buffer,
+		framebuffer_aspect(),
+	)
 }
 
 @(private = "file")
@@ -290,3 +813,145 @@ pick_present_mode :: proc(vsync: bool) -> wgpu.PresentMode {
 
 	return .Fifo // Vsync On
 }
+
+// Depth buffer: same size as the surface, should get recreated on resize
+@(private = "file")
+create_depth_texture :: proc() {
+	if state.depth_texture != nil {
+		wgpu.TextureViewRelease(state.depth_texture_view)
+		wgpu.TextureRelease(state.depth_texture)
+	}
+
+	state.depth_texture = wgpu.DeviceCreateTexture(
+		state.device,
+		&{
+			label = "depth texture",
+			usage = {.RenderAttachment},
+			dimension = ._2D,
+			size = {
+				width = state.config.width,
+				height = state.config.height,
+				depthOrArrayLayers = 1,
+			},
+			format = .Depth24Plus,
+			mipLevelCount = 1,
+			sampleCount = 1,
+		},
+	)
+	state.depth_texture_view = wgpu.TextureCreateView(state.depth_texture, nil)
+}
+
+@(private = "file")
+framebuffer_aspect :: proc() -> f32 {
+	width, height := os_get_framebuffer_size()
+	if height == 0 {
+		return 1
+	}
+	return cast(f32)width / cast(f32)height
+}
+
+// Perspective projection, WebGPU flavour
+@(private = "file")
+camera_perspective :: proc(fovy_degrees, aspect, near, far: f32) -> base.Mat4 {
+	gl := linalg.matrix4_perspective(
+		fovy_degrees * math.PI / 180.0,
+		aspect,
+		near,
+		far,
+	)
+	// GL's clip space is [-1, 1] and WebGPU's clip space is [0, 1],
+	// so fold z with a remap: z' = 1/2 z + 1/2 w
+	remap := linalg.identity(base.Mat4)
+	remap[2, 2] = 0.5
+	remap[2, 3] = 0.5
+	return remap * gl
+}
+
+@(private = "file")
+camera_mvp :: proc(aspect: f32) -> base.Mat4 {
+	projection := camera_perspective(60, aspect, 0.1, 100)
+	view := linalg.matrix4_look_at_f32({0, 2, 5}, {0, 0, 0}, {0, 1, 0})
+	// model = identity: the loader already centered the model at the origin
+	return projection * view
+}
+
+@(private = "file")
+upload_camera :: proc(queue: wgpu.Queue, buffer: wgpu.Buffer, aspect: f32) {
+	uniforms := Camera_Uniform {
+		mvp = camera_mvp(aspect),
+	}
+	// bufferOffset = offset into buffer to start from
+	wgpu.QueueWriteBuffer(queue, buffer, 0, &uniforms, size_of(Camera_Uniform))
+}
+
+// Test 256x256 checkerboard texture, uploaded once
+@(private = "file")
+create_diffuse_texture :: proc(
+	device: wgpu.Device,
+	queue: wgpu.Queue,
+) -> (
+	wgpu.Texture,
+	wgpu.TextureView,
+	wgpu.Sampler,
+) {
+	width, height: u32 = 256, 256
+	pixels := make([]u8, width * height * 4)
+	defer delete(pixels)
+
+	for y in 0 ..< height {
+		for x in 0 ..< width {
+			checker := ((x / 32) + (y / 32)) % 2 == 0
+			idx := (y * width + x) * 4
+			if checker {
+				pixels[idx + 0] = 240
+				pixels[idx + 1] = 240
+				pixels[idx + 2] = 240
+				pixels[idx + 3] = 255
+			} else {
+				pixels[idx + 0] = 64
+				pixels[idx + 1] = 64
+				pixels[idx + 2] = 64
+				pixels[idx + 3] = 255
+			}
+		}
+	}
+
+	texture := wgpu.DeviceCreateTexture(
+		device,
+		&{
+			label = "diffuse texture",
+			usage = {.TextureBinding, .CopyDst}, // shader samples, queue writes
+			dimension = ._2D,
+			size = {width = width, height = height, depthOrArrayLayers = 1},
+			format = .RGBA8Unorm,
+			mipLevelCount = 1,
+			sampleCount = 1,
+		},
+	)
+
+	// Upload texture to GPU
+	wgpu.QueueWriteTexture(
+		queue,
+		&{texture = texture, mipLevel = 0, origin = {0, 0, 0}, aspect = .All}, // destination
+		raw_data(pixels),
+		len(pixels),
+		&{offset = 0, bytesPerRow = width * 4, rowsPerImage = height}, // data layout
+		&{width = width, height = height, depthOrArrayLayers = 1}, // 3D extent
+	)
+
+	view := wgpu.TextureCreateView(texture, nil)
+
+	sampler := wgpu.DeviceCreateSampler(
+		device,
+		&{
+			addressModeU = .Repeat,
+			addressModeV = .Repeat,
+			magFilter = .Nearest,
+			minFilter = .Nearest,
+			mipmapFilter = .Nearest,
+			maxAnisotropy = 1,
+		},
+	)
+
+	return texture, view, sampler
+}

src/platform/wgpu_reflect.odin

@@ -0,0 +1,276 @@
+package platform
+
+import "core:fmt"
+import "core:reflect"
+import "core:strings"
+
+import "wgpu:wgpu"
+
+// -----------------------------------------
+// Types
+
+// -----------------------------------------
+// Public functions
+
+// Generate a WGSL struct declaration from an Odin struct type.
+// The caller owns the returned string (allocated on context.allocator).
+//
+// If locations is true, each member is prefixed with @location(n). This is
+// required for vertex input structs; uniform structs should use false.
+to_wgsl_struct :: proc(
+	$T: typeid,
+	name: string,
+	locations := false,
+) -> string {
+	ti := base_type_info(type_info_of(T))
+	s, ok := ti.variant.(reflect.Type_Info_Struct)
+	if !ok do fmt.panicf("[wgpu_reflect] %s is not a struct", typeid_of(T))
+
+	b: strings.Builder
+	strings.write_string(&b, "struct ")
+	strings.write_string(&b, name)
+	strings.write_string(&b, " {\n")
+
+	names := s.names[:s.field_count]
+	types := s.types[:s.field_count]
+	for i in 0 ..< s.field_count {
+		wgsl_type, type_ok := to_wgsl_type(types[i])
+		if !type_ok {
+			fmt.panicf("[wgpu_reflect] cannot map field %s to WGSL", names[i])
+		}
+		if locations {
+			fmt.sbprintf(
+				&b,
+				"\t@location(%d) %s: %s,\n",
+				i,
+				names[i],
+				wgsl_type,
+			)
+		} else {
+			fmt.sbprintf(&b, "\t%s: %s,\n", names[i], wgsl_type)
+		}
+	}
+
+	strings.write_string(&b, "};")
+	return strings.to_string(b)
+}
+
+// Generate a []wgpu.VertexAttribute array that matches the fields of struct T.
+// The caller owns the returned slice (allocated on context.allocator)
+to_vertex_attributes :: proc($T: typeid) -> []wgpu.VertexAttribute {
+	ti := base_type_info(type_info_of(T))
+	s, ok := ti.variant.(reflect.Type_Info_Struct)
+	if !ok do fmt.panicf("[wgpu_reflect] %s is not a struct", typeid_of(T))
+
+	attrs := make([]wgpu.VertexAttribute, s.field_count)
+	names := s.names[:s.field_count]
+	types := s.types[:s.field_count]
+	offsets := s.offsets[:s.field_count]
+
+	for i in 0 ..< s.field_count {
+		format, format_ok := to_vertex_format(types[i])
+		if !format_ok {
+			fmt.panicf(
+				"[wgpu_reflect] cannot map field %s to a vertex format",
+				names[i],
+			)
+		}
+
+		attrs[i] = wgpu.VertexAttribute {
+			format         = format,
+			offset         = cast(u64)offsets[i],
+			shaderLocation = u32(i),
+		}
+	}
+
+	return attrs
+}
+
+// -----------------------------------------
+// Private functions
+
+// Strips named-type wrappers so we can inspect the underlying type
+@(private = "file")
+base_type_info :: proc(type_info: ^reflect.Type_Info) -> ^reflect.Type_Info {
+	#partial switch v in type_info.variant {
+		case reflect.Type_Info_Named:
+			return base_type_info(v.base)
+	}
+	return type_info
+}
+
+// Map an Odin type to a WGSL scalar/vector/matrix type name
+@(private = "file")
+to_wgsl_type :: proc(type_info: ^reflect.Type_Info) -> (string, bool) {
+	ti := base_type_info(type_info)
+
+	#partial switch v in ti.variant {
+		case reflect.Type_Info_Float:
+			switch ti.size {
+				case 4:
+					return "f32", true
+				case 8:
+					return "f64", true
+			}
+
+		case reflect.Type_Info_Integer:
+			prefix := v.signed ? "i" : "u"
+			switch ti.size {
+				case 1:
+					return fmt.tprintf("%s8", prefix), true
+				case 2:
+					return fmt.tprintf("%s16", prefix), true
+				case 4:
+					return fmt.tprintf("%s32", prefix), true
+				case 8:
+					return fmt.tprintf("%s64", prefix), true
+			}
+
+		case reflect.Type_Info_Array:
+			elem_type, elem_ok := to_wgsl_type(v.elem)
+			if !elem_ok do return "", false
+			switch v.count {
+				case 2:
+					return fmt.tprintf("vec2<%s>", elem_type), true
+				case 3:
+					return fmt.tprintf("vec3<%s>", elem_type), true
+				case 4:
+					return fmt.tprintf("vec4<%s>", elem_type), true
+			}
+
+		case reflect.Type_Info_Matrix:
+			elem_type, elem_ok := to_wgsl_type(v.elem)
+			if !elem_ok do return "", false
+			return fmt.tprintf(
+					"mat%dx%d<%s>",
+					v.column_count,
+					v.row_count,
+					elem_type,
+				),
+				true
+
+		case:
+			fmt.panicf("[wgpu_reflect] unimplemented type translation: %v", ti)
+	}
+
+	return "", false
+}
+
+// Map an Odin type to a wgpu.VertexFormat.
+// Only handles the scalar/vector numeric formats commonly used as vertex attributes
+@(private = "file")
+to_vertex_format :: proc(
+	type_info: ^reflect.Type_Info,
+) -> (
+	wgpu.VertexFormat,
+	bool,
+) {
+	ti := base_type_info(type_info)
+
+	#partial switch v in ti.variant {
+		case reflect.Type_Info_Float:
+			if ti.size == 2 do return .Float16, true
+			else if ti.size == 4 do return .Float32, true
+
+		case reflect.Type_Info_Integer:
+			if v.signed {
+				switch ti.size {
+					case 1:
+						return .Sint8, true
+					case 2:
+						return .Sint16, true
+					case 4:
+						return .Sint32, true
+				}
+			} else {
+				switch ti.size {
+					case 1:
+						return .Uint8, true
+					case 2:
+						return .Uint16, true
+					case 4:
+						return .Uint32, true
+				}
+			}
+
+		case reflect.Type_Info_Array:
+			elem := base_type_info(v.elem)
+			#partial switch ev in elem.variant {
+				case reflect.Type_Info_Float:
+					if elem.size == 2 {
+						switch v.count {
+							case 2:
+								return .Float16x2, true
+							case 4:
+								return .Float16x4, true
+						}
+					} else if elem.size == 4 {
+						switch v.count {
+							case 2:
+								return .Float32x2, true
+							case 3:
+								return .Float32x3, true
+							case 4:
+								return .Float32x4, true
+						}
+					}
+
+				case reflect.Type_Info_Integer:
+					if ev.signed {
+						switch elem.size {
+							case 1:
+								switch v.count {
+									case 2:
+										return .Sint8x2, true
+									case 4:
+										return .Sint8x4, true
+								}
+							case 2:
+								switch v.count {
+									case 2:
+										return .Sint16x2, true
+									case 4:
+										return .Sint16x4, true
+								}
+							case 4:
+								switch v.count {
+									case 2:
+										return .Sint32x2, true
+									case 3:
+										return .Sint32x3, true
+									case 4:
+										return .Sint32x4, true
+								}
+						}
+					} else {
+						switch elem.size {
+							case 1:
+								switch v.count {
+									case 2:
+										return .Uint8x2, true
+									case 4:
+										return .Uint8x4, true
+								}
+							case 2:
+								switch (v.count) {
+									case 2:
+										return .Uint16x2, true
+									case 4:
+										return .Uint16x4, true
+								}
+							case 4:
+								switch (v.count) {
+									case 2:
+										return .Uint32x2, true
+									case 3:
+										return .Uint32x3, true
+									case 4:
+										return .Uint32x4, true
+								}
+						}
+					}
+			}
+	}
+
+	return .Float32, false
+}