added section for file loading + memory cleanup

Make sure to clean up any memory allocated to the sim in terms of
disassembly instructions etc

src/simulator/gui.odin

@@ -115,6 +115,9 @@ run_gui :: proc(sim: ^Simulator) {
 	rl.UnloadSound(beep)
 	rl.CloseAudioDevice()
 	rl.CloseWindow()
+
+	// Free any allocated memory for the simulator
+	delete(sim.disasm)
 }
 
 // @TODO: If this grows lets move it into its own file
@@ -128,6 +131,7 @@ calc_layout :: proc(screen_width: f32, screen_height: f32) -> Layout {
 	sidebar_width	   := screen_width * SIDEBAR_PERCENT
 	display_width	   := screen_width - (sidebar_width * 2) - sidebar_width
 	display_height	   := visible_height * DISPLAY_V_RATIO
+	keypad_height	   := (y_pos + visible_height - visible_height / 2)
 
 	x_center		   := sidebar_width
 	y_center		   := screen_width - sidebar_width * 2
@@ -144,11 +148,11 @@ calc_layout :: proc(screen_width: f32, screen_height: f32) -> Layout {
 			x = 0,
 			y = y_pos,
 			width = sidebar_width,
-			height = visible_height / 3
+			height = keypad_height - y_pos
 		},
 		keypad = rl.Rectangle{
 			x = 0,
-			y = (y_pos + visible_height - visible_height / 2),
+			y = keypad_height,
 			width = sidebar_width,
 			height = visible_height / 2
 		},

src/simulator/gui_file_loader.odin

@@ -16,15 +16,17 @@ Instruction :: struct {
 gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 	rl.DrawRectangleLinesEx(rect, 1, rl.GRAY)
 
+	// FILE SECTION:
+	// ---------------------------------------------
+	top_bounds_height := (rect.height - (PADDING_Y * 2)) / 3
 	bounds := rl.Rectangle {
 		x = rect.x + PADDING_X,
 		y = rect.y + PADDING_Y,
 		width = rect.width - (PADDING_X * 2),
-		height = rect.height - (PADDING_Y * 2),
+		height = top_bounds_height
 	}
-	rl.GuiPanel(bounds, "Rom / File")
+	rl.GuiPanel(bounds, nil)
 
-	// open rom button below drop-zone
 	btn_rect := rl.Rectangle {
 		bounds.x,
 		bounds.y,
@@ -48,6 +50,9 @@ gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 		}
 
 		sim.rom_loaded = true
+
+		// Free old instructions on sim
+		delete(sim.disasm)
 		sim.disasm = disassemble_rom(sim.machine.memory[:], 0x200, 0x200 + u16(rom_size))
 	}
 
@@ -63,7 +68,7 @@ gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 	// centered drop-zone text
 	text: cstring = "Drop a CHIP-8 ROM here"
 	text_width := rl.MeasureText(text, BIG_FONT_SIZE)
-	text_x := drop_zone.x + (drop_zone.width - f32(text_width)) / 2
+	text_x := drop_zone.x + (drop_zone.width - f32(text_width))
 	text_y := drop_zone.y + (drop_zone.height - f32(BIG_FONT_SIZE)) / 2
 	rl.DrawTextEx(sim.font, text, {text_x, text_y}, BIG_FONT_SIZE, 1, rl.WHITE)
 
@@ -76,13 +81,31 @@ gui_file_loader :: proc(rect: rl.Rectangle, sim: ^Simulator) {
 			if rl.CheckCollisionPointRec(mouse, drop_zone) {
 				path_str := string(dropped_file.paths[0])
 				log.info("file dropped: ", path_str)
-				// @TODO: Stop sim, reset mem etc, load new rom
 			} else {
 				log.info("File dropped outside drop zone, ignoring")
 			}
 		}
 		rl.UnloadDroppedFiles(dropped_file)
 	}
+
+	// FOLDER SECTION:
+	// ---------------------------------------------
+	bottom_bounds := rl.Rectangle {
+		x = bounds.x,
+		y = bounds.y + top_bounds_height,
+		width = rect.width - (PADDING_X * 2),
+		height = rect.height - top_bounds_height - (PADDING_X * 2)
+	}
+	rl.GuiPanel(bottom_bounds, nil)
+
+	bottom_btn_rect := rl.Rectangle {
+		bottom_bounds.x,
+		bottom_bounds.y,
+		rect.width - (PADDING_X * 2),
+		BUTTON_HEIGHT,
+	}
+
+	rl.GuiButton(bottom_btn_rect, "Open ROM Folder")
 }
 
 disassemble_rom :: proc(memory: []u8, start: u16, end_addr: u16) -> []Instruction {
@@ -167,28 +190,3 @@ disassemble_rom :: proc(memory: []u8, start: u16, end_addr: u16) -> []Instructio
 
 	return entries[:]
 }
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