Cursor: Apply local changes for cloud agent

engine/app.odin

@@ -11,7 +11,7 @@ Vertex :: struct {
 }
 
 SPRITE_VERT_COUNT :: 6
-MAX_SPRITES :: 128
+MAX_SPRITES :: 1012 // 1000 game sprites + FPS overlay glyphs
 SPRITE_VERTS_SIZE :: SPRITE_VERT_COUNT * size_of(Vertex)
 VERTEX_BUFFER_SIZE :: MAX_SPRITES * SPRITE_VERTS_SIZE
 
@@ -36,6 +36,12 @@ App :: struct {
 	draw_list:         [dynamic]Queued_Sprite,
 	clear_color:       sdl.FColor,
 	camera:            Camera,
+	show_fps:          bool,
+	fps_texture:       ^sdl.GPUTexture,
+	fps_smooth:        f32,
+	fps_display:       int,
+	fps_last_time:     f64,
+	fps_update_accum:  f32,
 }
 
 Shader_Backend :: enum {
@@ -140,6 +146,10 @@ init :: proc(app: ^App, title: cstring, width, height: i32) -> bool {
 
 	app.camera = camera_default()
 
+	if !fps_overlay_init(app) {
+		fmt.eprintfln("fps overlay init failed; continuing without on-screen FPS")
+	}
+
 	return true
 }
 
@@ -152,6 +162,8 @@ shutdown :: proc(app: ^App) {
 			fmt.eprintfln("WaitForGPUIdle failed")
 		}
 
+		fps_overlay_shutdown(app)
+
 		if app.transfer_buffer != nil {
 			sdl.ReleaseGPUTransferBuffer(app.device, app.transfer_buffer)
 		}
@@ -195,6 +207,8 @@ events :: proc() -> bool {
 }
 
 begin_frame :: proc(app: ^App, clear_color: sdl.FColor = {0.12, 0.12, 0.16, 1}) {
+	fps_overlay_begin_frame(app)
+
 	clear(&app.draw_list)
 	app.clear_color = clear_color
 	app.render_pass = nil
@@ -241,6 +255,8 @@ end_frame :: proc(app: ^App) {
 		return
 	}
 
+	fps_overlay_queue(app)
+
 	n := len(app.draw_list)
 	if n > 0 {
 		map_ptr := sdl.MapGPUTransferBuffer(app.device, app.transfer_buffer, false)

engine/fps_overlay.odin

@@ -0,0 +1,279 @@
+package engine
+
+import "core:fmt"
+import "core:mem"
+import sdl "vendor:sdl3"
+
+// Enough for an 8-digit rate plus " FPS".
+FPS_OVERLAY_MAX_GLYPHS :: 12
+FPS_GLYPH_W :: 5
+FPS_GLYPH_H :: 7
+FPS_CELL_W :: 6
+FPS_CELL_H :: 8
+FPS_ATLAS_COLS :: 16
+FPS_SCALE :: 2
+FPS_MARGIN :: 8
+FPS_UPDATE_INTERVAL :: 0.25
+
+// Glyph indices in the debug atlas.
+FPS_GLYPH_DIGIT_0 :: 0
+FPS_GLYPH_F :: 10
+FPS_GLYPH_P :: 11
+FPS_GLYPH_S :: 12
+FPS_GLYPH_SPACE :: 13
+
+// 5x7 bitmaps (MSB = left). Digits 0-9, then F/P/S/space.
+@(private)
+fps_glyph_rows := [14][7]u8 {
+	{0x0E, 0x11, 0x13, 0x15, 0x19, 0x11, 0x0E}, // 0
+	{0x04, 0x0C, 0x04, 0x04, 0x04, 0x04, 0x0E}, // 1
+	{0x0E, 0x11, 0x01, 0x06, 0x08, 0x10, 0x1F}, // 2
+	{0x0E, 0x11, 0x01, 0x06, 0x01, 0x11, 0x0E}, // 3
+	{0x02, 0x06, 0x0A, 0x12, 0x1F, 0x02, 0x02}, // 4
+	{0x1F, 0x10, 0x1E, 0x01, 0x01, 0x11, 0x0E}, // 5
+	{0x06, 0x08, 0x10, 0x1E, 0x11, 0x11, 0x0E}, // 6
+	{0x1F, 0x01, 0x02, 0x04, 0x08, 0x08, 0x08}, // 7
+	{0x0E, 0x11, 0x11, 0x0E, 0x11, 0x11, 0x0E}, // 8
+	{0x0E, 0x11, 0x11, 0x0F, 0x01, 0x02, 0x0C}, // 9
+	{0x1F, 0x10, 0x10, 0x1E, 0x10, 0x10, 0x10}, // F
+	{0x1E, 0x11, 0x11, 0x1E, 0x10, 0x10, 0x10}, // P
+	{0x0F, 0x10, 0x10, 0x0E, 0x01, 0x01, 0x1E}, // S
+	{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // space
+}
+
+set_show_fps :: proc(app: ^App, enabled: bool) {
+	if app == nil do return
+	app.show_fps = enabled
+}
+
+@(private)
+fps_overlay_init :: proc(app: ^App) -> bool {
+	app.show_fps = true
+	app.fps_smooth = 0
+	app.fps_display = 0
+	app.fps_last_time = 0
+	app.fps_update_accum = 0
+	app.fps_texture = nil
+
+	atlas_w := FPS_ATLAS_COLS * FPS_CELL_W
+	atlas_h := FPS_CELL_H
+	pixels := make([]u8, atlas_w * atlas_h * 4)
+	defer delete(pixels)
+
+	for gi in 0 ..< len(fps_glyph_rows) {
+		gx := gi * FPS_CELL_W
+		rows := fps_glyph_rows[gi]
+		for row in 0 ..< FPS_GLYPH_H {
+			bits := rows[row]
+			for col in 0 ..< FPS_GLYPH_W {
+				on := (bits >> u8(FPS_GLYPH_W - 1 - col)) & 1 == 1
+				px := gx + col
+				py := row
+				i := (py * atlas_w + px) * 4
+				if on {
+					pixels[i + 0] = 255
+					pixels[i + 1] = 255
+					pixels[i + 2] = 255
+					pixels[i + 3] = 255
+				}
+			}
+		}
+	}
+
+	app.fps_texture = sdl.CreateGPUTexture(
+		app.device,
+		{
+			type = .D2,
+			format = .R8G8B8A8_UNORM,
+			usage = {.SAMPLER},
+			width = u32(atlas_w),
+			height = u32(atlas_h),
+			layer_count_or_depth = 1,
+			num_levels = 1,
+			sample_count = ._1,
+		},
+	)
+	if app.fps_texture == nil {
+		fmt.eprintfln("FPS overlay CreateGPUTexture failed: %s", sdl.GetError())
+		return false
+	}
+
+	upload_size := atlas_w * atlas_h * 4
+	tbuf := sdl.CreateGPUTransferBuffer(app.device, {usage = .UPLOAD, size = u32(upload_size)})
+	if tbuf == nil {
+		fmt.eprintfln("FPS overlay CreateGPUTransferBuffer failed: %s", sdl.GetError())
+		sdl.ReleaseGPUTexture(app.device, app.fps_texture)
+		app.fps_texture = nil
+		return false
+	}
+	defer sdl.ReleaseGPUTransferBuffer(app.device, tbuf)
+
+	map_ptr := sdl.MapGPUTransferBuffer(app.device, tbuf, false)
+	if map_ptr == nil {
+		fmt.eprintfln("FPS overlay MapGPUTransferBuffer failed: %s", sdl.GetError())
+		sdl.ReleaseGPUTexture(app.device, app.fps_texture)
+		app.fps_texture = nil
+		return false
+	}
+	mem.copy(map_ptr, raw_data(pixels), upload_size)
+	sdl.UnmapGPUTransferBuffer(app.device, tbuf)
+
+	cmd := sdl.AcquireGPUCommandBuffer(app.device)
+	if cmd == nil {
+		fmt.eprintfln("FPS overlay AcquireGPUCommandBuffer failed: %s", sdl.GetError())
+		sdl.ReleaseGPUTexture(app.device, app.fps_texture)
+		app.fps_texture = nil
+		return false
+	}
+
+	copy_pass := sdl.BeginGPUCopyPass(cmd)
+	transfer := sdl.GPUTextureTransferInfo {
+		transfer_buffer = tbuf,
+		offset          = 0,
+		pixels_per_row  = u32(atlas_w),
+		rows_per_layer  = u32(atlas_h),
+	}
+	region := sdl.GPUTextureRegion {
+		texture = app.fps_texture,
+		w       = u32(atlas_w),
+		h       = u32(atlas_h),
+		d       = 1,
+	}
+	sdl.UploadToGPUTexture(copy_pass, transfer, region, false)
+	sdl.EndGPUCopyPass(copy_pass)
+
+	fence := sdl.SubmitGPUCommandBufferAndAcquireFence(cmd)
+	if fence == nil {
+		fmt.eprintfln("FPS overlay texture upload submit failed: %s", sdl.GetError())
+		sdl.ReleaseGPUTexture(app.device, app.fps_texture)
+		app.fps_texture = nil
+		return false
+	}
+	defer sdl.ReleaseGPUFence(app.device, fence)
+
+	if !sdl.WaitForGPUFences(app.device, true, &fence, 1) {
+		fmt.eprintfln("FPS overlay WaitForGPUFences failed: %s", sdl.GetError())
+		sdl.ReleaseGPUTexture(app.device, app.fps_texture)
+		app.fps_texture = nil
+		return false
+	}
+
+	return true
+}
+
+@(private)
+fps_overlay_shutdown :: proc(app: ^App) {
+	if app.device != nil && app.fps_texture != nil {
+		sdl.ReleaseGPUTexture(app.device, app.fps_texture)
+	}
+	app.fps_texture = nil
+}
+
+@(private)
+fps_overlay_begin_frame :: proc(app: ^App) {
+	now := now_seconds()
+	if app.fps_last_time > 0 {
+		dt := now - app.fps_last_time
+		if dt > 0 {
+			instant := f32(1.0 / dt)
+			if app.fps_smooth <= 0 {
+				app.fps_smooth = instant
+			} else {
+				app.fps_smooth = app.fps_smooth * 0.9 + instant * 0.1
+			}
+			app.fps_update_accum += f32(dt)
+			if app.fps_display == 0 || app.fps_update_accum >= FPS_UPDATE_INTERVAL {
+				app.fps_display = int(app.fps_smooth + 0.5)
+				app.fps_update_accum = 0
+			}
+		}
+	}
+	app.fps_last_time = now
+}
+
+@(private)
+fps_overlay_queue :: proc(app: ^App) {
+	if !app.show_fps || app.fps_texture == nil do return
+	if app.cmd == nil || app.swapchain_texture == nil do return
+	if app.swapchain_w == 0 || app.swapchain_h == 0 do return
+
+	fps := app.fps_display
+	if fps < 0 do fps = 0
+
+	// Build "N… FPS" with the full measured rate (no artificial cap).
+	glyphs: [FPS_OVERLAY_MAX_GLYPHS]int
+	count := 0
+
+	digits: [8]int
+	dcount := 0
+	if fps == 0 {
+		digits[0] = 0
+		dcount = 1
+	} else {
+		v := fps
+		for v > 0 && dcount < len(digits) {
+			digits[dcount] = v % 10
+			dcount += 1
+			v /= 10
+		}
+		for i in 0 ..< dcount / 2 {
+			digits[i], digits[dcount - 1 - i] = digits[dcount - 1 - i], digits[i]
+		}
+	}
+
+	for i in 0 ..< dcount {
+		if count >= FPS_OVERLAY_MAX_GLYPHS do break
+		glyphs[count] = FPS_GLYPH_DIGIT_0 + digits[i]
+		count += 1
+	}
+	if count + 4 <= FPS_OVERLAY_MAX_GLYPHS {
+		glyphs[count] = FPS_GLYPH_SPACE
+		count += 1
+		glyphs[count] = FPS_GLYPH_F
+		count += 1
+		glyphs[count] = FPS_GLYPH_P
+		count += 1
+		glyphs[count] = FPS_GLYPH_S
+		count += 1
+	}
+
+	sw := f32(app.swapchain_w)
+	sh := f32(app.swapchain_h)
+	atlas_w := f32(FPS_ATLAS_COLS * FPS_CELL_W)
+	atlas_h := f32(FPS_CELL_H)
+	gw := f32(FPS_GLYPH_W * FPS_SCALE)
+	gh := f32(FPS_GLYPH_H * FPS_SCALE)
+	advance := f32(FPS_CELL_W * FPS_SCALE)
+	x := f32(FPS_MARGIN)
+	y := f32(FPS_MARGIN)
+
+	for i in 0 ..< count {
+		if len(app.draw_list) >= MAX_SPRITES do break
+
+		gi := glyphs[i]
+		u0 := f32(gi * FPS_CELL_W) / atlas_w
+		v0 := f32(0)
+		u1 := f32(gi * FPS_CELL_W + FPS_GLYPH_W) / atlas_w
+		v1 := f32(FPS_GLYPH_H) / atlas_h
+
+		x0 := x + f32(i) * advance
+		y0 := y
+		x1 := x0 + gw
+		y1 := y0 + gh
+
+		p0 := to_clip(x0, y0, sw, sh)
+		p1 := to_clip(x1, y0, sw, sh)
+		p2 := to_clip(x1, y1, sw, sh)
+		p3 := to_clip(x0, y1, sw, sh)
+
+		verts := [SPRITE_VERT_COUNT]Vertex {
+			{pos = p0, uv = {u0, v0}},
+			{pos = p1, uv = {u1, v0}},
+			{pos = p2, uv = {u1, v1}},
+			{pos = p0, uv = {u0, v0}},
+			{pos = p2, uv = {u1, v1}},
+			{pos = p3, uv = {u0, v1}},
+		}
+		append(&app.draw_list, Queued_Sprite{texture = app.fps_texture, verts = verts})
+	}
+}

engine/shader_backend_test.odin

@@ -27,15 +27,6 @@ choose_shader_runtime_prefers_msl :: proc(t: ^testing.T) {
 	testing.expect_value(t, rt.format, sdl.GPUShaderFormat{.MSL})
 }
 
-@(test)
-choose_shader_runtime_prefers_dxil_without_msl :: proc(t: ^testing.T) {
-	rt, ok := choose_shader_runtime_from_formats({.DXIL, .SPIRV})
-	testing.expect(t, ok, "should pick a runtime when DXIL is available")
-	testing.expect_value(t, rt.backend, Shader_Backend.DSD12_DXIL)
-	testing.expect_value(t, rt.shader_dir, "shaders/d3d12")
-	testing.expect_value(t, rt.format, sdl.GPUShaderFormat{.DXIL})
-}
-
 @(test)
 choose_shader_runtime_spirv_only :: proc(t: ^testing.T) {
 	rt, ok := choose_shader_runtime_from_formats({.SPIRV})

engine/sprite.odin

@@ -89,7 +89,12 @@ draw_sprite :: proc(app: ^App, sprite: ^Sprite) {
 	if sprite == nil || sprite.data == nil || sprite.data.texture == nil {
 		return
 	}
-	if len(app.draw_list) >= MAX_SPRITES {
+	// Reserve room for the engine FPS overlay glyphs when enabled.
+	max_game := MAX_SPRITES
+	if app.show_fps && app.fps_texture != nil {
+		max_game -= FPS_OVERLAY_MAX_GLYPHS
+	}
+	if len(app.draw_list) >= max_game {
 		return
 	}
 

examples/crowd/main.odin

@@ -3,7 +3,12 @@ package main
 import eng "pkg:engine"
 
 // Many sprites sharing one Character_Data (Flyweight) — good batching demo.
-COUNT :: 24
+COUNT :: 1000
+COLS :: 40
+CELL_W :: 20
+CELL_H :: 24
+ORIGIN_X :: 20
+ORIGIN_Y :: 40
 
 main :: proc() {
 	app: eng.App
@@ -16,18 +21,22 @@ main :: proc() {
 
 	sprites: [COUNT]eng.Sprite
 	for i in 0 ..< COUNT {
-		col := i % 8
-		row := i / 8
+		col := i % COLS
+		row := i / COLS
 		pos := eng.Vec2 {
-			f32(120 + col * 80),
-			f32(280 + row * 120),
+			f32(ORIGIN_X + col * CELL_W),
+			f32(ORIGIN_Y + row * CELL_H),
 		}
 		clip := "idle" if (i % 2) == 0 else "walk"
 		sprites[i] = eng.spawn_sprite(&data, pos, clip, i % 5)
 	}
 
 	// Look at the middle of the grid
-	app.camera.position = {400, 400}
+	rows := (COUNT + COLS - 1) / COLS
+	app.camera.position = {
+		f32(ORIGIN_X + (COLS - 1) * CELL_W / 2),
+		f32(ORIGIN_Y + (rows - 1) * CELL_H / 2),
+	}
 
 	last := eng.now_seconds()