Updated showcase.

Added 2 new helper functions one to load a rom selected on system and
anothe to load a rom into memory from the embedded roms.

src/simulator/gui.odin

@@ -25,6 +25,7 @@ BUTTON_WIDTH		:: 120
 // Fonts
 BIG_FONT_SIZE		:: 20
 KEYPAD_FONT_SIZE	:: 18
+LINE_HEIGHT 		:: 22
 
 Layout :: struct {
 	control_bar  : rl.Rectangle,

src/simulator/gui_file_loader.odin

@@ -1,5 +1,6 @@
 package simulator
 
+import "core:strings"
 import "core:fmt"
 import "core:log"
 import rl "vendor:raylib"
@@ -32,18 +33,7 @@ gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 		ret := tfd.openFileDialog("Open File Dialog", nil, 0, nil, nil, 0,)
 		rom_path := string(ret)
 		if rom_path == "" do return
-
+		load_selected_rom(sim, rom_path)
-		// Reset machine state
-		emu.reset_machine(sim.machine)
-
-		// load new rom
-		rom_size, err := emu.load_rom(sim.machine, rom_path)
-		if err != nil {
-			// @TODO: update status bar here
-			panic("failed to load rom!")
-		}
-		sim.rom_loaded = true
-		sim.disasm_count = disassemble_rom_n(sim.machine.memory[:], 0x200, 0x200 + u16(rom_size), sim.disasm[:])
 	}
 
 	// drop-zone occupies the panel's content area, minus space for the button
@@ -78,7 +68,7 @@ gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 		rl.UnloadDroppedFiles(dropped_file)
 	}
 
-	// FOLDER SECTION:
+	// Embedded Rom Section:
 	// ---------------------------------------------
 	bottom_bounds := rl.Rectangle {
 		x = bounds.x,
@@ -86,16 +76,82 @@ gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 		width = rect.width - (PADDING_X * 2),
 		height = rect.height - top_bounds_height - (PADDING_X * 2)
 	}
-	rl.GuiPanel(bottom_bounds, nil)
+	rl.GuiPanel(bottom_bounds, "ROM List")
 
-	bottom_btn_rect := rl.Rectangle {
+	panel_rect := rl.Rectangle {
-		bottom_bounds.x,
+		x = bottom_bounds.x,
-		bottom_bounds.y,
+		y = bottom_bounds.y + PANEL_HEADER,
-		rect.width - (PADDING_X * 2),
+		width = rect.width - (PADDING_X * 2),
-		BUTTON_HEIGHT,
+		height = rect.height - top_bounds_height - (PADDING_X * 2) - PANEL_HEADER
 	}
 
-	rl.GuiButton(bottom_btn_rect, "Open ROM Folder")
+	content_rect := rl.Rectangle {
+		x = panel_rect.x,
+		y = panel_rect.y - PANEL_HEADER,
+		width = panel_rect.width + PANEL_HEADER,
+		height = f32(len(roms)) * LINE_HEIGHT
+	}
+
+	view:   rl.Rectangle
+	rl.GuiScrollPanel(panel_rect, nil, content_rect, &sim.rompick_scroll, &view)
+
+	rl.BeginScissorMode(i32(view.x), i32(view.y), i32(view.width), i32(view.height))
+	defer rl.EndScissorMode()
+
+	for path, index in roms {
+		y_pos := panel_rect.y + f32(index * LINE_HEIGHT) + sim.rompick_scroll.y
+
+		row_rect := rl.Rectangle {
+	  		x      = view.x,
+			y      = y_pos,
+			width  = view.width,
+			height = LINE_HEIGHT,
+		}
+
+		// make selected visible
+		if path.name == sim.selected_rom {
+			rl.DrawRectangleRec(row_rect, rl.ColorAlpha(rl.SKYBLUE, 0.25))
+		}
+
+		// hover rows
+		mouse := rl.GetMousePosition()
+		if rl.CheckCollisionPointRec(mouse, row_rect) {
+   			rl.DrawRectangleRec(row_rect, rl.ColorAlpha(rl.WHITE, 0.08))
+        	if rl.IsMouseButtonPressed(.LEFT) {
+            	sim.selected_rom = path.name
+             	load_embedded_rom(sim, path.name, roms[index].data)
+         	}
+		}
+
+		txt := fmt.tprintf("%v: %v", (index + 1), path.name)
+		rl.DrawTextEx(
+			sim.font,
+			strings.clone_to_cstring(txt, context.temp_allocator),
+			{panel_rect.x + PADDING_X + sim.rompick_scroll.x, y_pos + (LINE_HEIGHT - 18) * 0.5},
+			18, 1,
+			rl.WHITE
+		)
+	}
+}
+
+load_selected_rom :: proc(sim: ^Simulator, rom_path: string) {
+	emu.reset_machine(sim.machine)
+	rom_size, err := emu.load_rom(sim.machine, rom_path)
+	if err != nil {
+		// @TODO: update status bar here
+		panic("failed to load rom!")
+	}
+	sim.rom_loaded = true
+	sim.paused = true
+	sim.disasm_count = disassemble_rom_n(sim.machine.memory[:], 0x200, 0x200 + u16(rom_size), sim.disasm[:])
+}
+
+load_embedded_rom :: proc(sim: ^Simulator, path: string, data: []byte) {
+    emu.reset_machine(sim.machine)
+    copy(sim.machine.memory[0x200:], data)
+    sim.rom_loaded = true
+    sim.paused = true
+    sim.disasm_count = disassemble_rom_n(sim.machine.memory[:], 0x200, 0x200 + u16(len(data)), sim.disasm[:])
 }
 
 disassemble_rom_n :: proc(memory: []u8, start_addr: u16, end_addr: u16, out: []Instruction) -> int {

src/simulator/gui_tab_disasm.odin

@@ -27,8 +27,6 @@ gui_tab_disasm :: proc(rect: rl.Rectangle, sim: ^Simulator) {
     }
 	rl.GuiPanel(panel_rect, nil)
 
-	LINE_HEIGHT :: 22
-
 	// Total height of all instructions
 	content_rect := rl.Rectangle {
 		x = panel_rect.x,

src/simulator/simulator.odin

@@ -3,6 +3,9 @@ package simulator
 import emu "../machine"
 import rl "vendor:raylib"
 
+// Embed roms
+roms := #load_directory("../roms")
+
 // CHIP-8 ROM can be at most 3584 bytes (4096 - 0x200 reserved)
 // Each instruction is 2 bytes, 3584 / 2 = 1792 instructions.
 MAX_INSTRUCTIONS :: 1792
@@ -25,6 +28,8 @@ Simulator :: struct {
 	font:			   rl.Font,
 	active_tab:		   i32,
 	mem_scroll:        rl.Vector2,
+	rompick_scroll:    rl.Vector2,
+	selected_rom:      string,
 	// disassembly props
 	disasm:		       [MAX_INSTRUCTIONS]Instruction,
 	disasm_follow:	   bool,