--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nuklear_ui/debug_ui.c	Thu Jun 19 19:59:05 2025 -0700
@@ -0,0 +1,162 @@
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "blastem_nuklear.h"
+#include "../blastem.h"
+#include "../genesis.h"
+#include "../sms.h"
+#include "../coleco.h"
+
+typedef struct {
+	struct nk_context *context;
+	uint32_t          tex_width;
+	uint32_t          tex_height;
+	uint8_t           win_idx;
+} debug_window;
+
+static debug_window windows[NUM_DEBUG_TYPES];
+
+static void debug_handle_event(uint8_t which, SDL_Event *event)
+{
+	for (int i = 0; i < NUM_DEBUG_TYPES; i++)
+	{
+		if (windows[i].win_idx == which) {
+			nk_sdl_handle_event(windows[i].context, event);
+			break;
+		}
+	}
+}
+
+#ifndef DISABLE_OPENGL
+vdp_context *get_vdp(void)
+{
+	if (!current_system) {
+		return NULL;
+	}
+	switch (current_system->type)
+	{
+	case SYSTEM_GENESIS:
+	case SYSTEM_SEGACD:
+	case SYSTEM_PICO:
+	case SYSTEM_COPERA:
+		return ((genesis_context *)current_system)->vdp;
+	case SYSTEM_SMS:
+	case SYSTEM_GAME_GEAR:
+	case SYSTEM_SG1000:
+	case SYSTEM_SC3000:
+		return ((sms_context *)current_system)->vdp;
+	case SYSTEM_COLECOVISION:
+		return ((coleco_context *)current_system)->vdp;
+	default:
+		return NULL;
+	}
+}
+
+void write_cram_internal(vdp_context * context, uint16_t addr, uint16_t value);
+static void cram_debug_ui(void)
+{
+	vdp_context *vdp = get_vdp();
+	if (!vdp) {
+		return;
+	}
+	struct nk_context *context = windows[DEBUG_CRAM].context;
+	nk_input_end(context);
+	char buf[64];
+	
+	struct nk_image main_image = nk_image_id((int)render_get_window_texture(windows[DEBUG_CRAM].win_idx));
+	if (nk_begin(context, "CRAM Debug", nk_rect(0, 0, windows[DEBUG_CRAM].tex_width + 100 + 8, windows[DEBUG_CRAM].tex_height + 8), NK_WINDOW_NO_SCROLLBAR)) {
+		nk_layout_space_begin(context, NK_STATIC, windows[DEBUG_CRAM].tex_height, INT_MAX);
+		nk_layout_space_push(context, nk_rect(100, 0, windows[DEBUG_CRAM].tex_width, windows[DEBUG_CRAM].tex_height));
+		nk_image(context, main_image);
+		struct nk_rect bounds = nk_layout_widget_bounds(context);
+		bounds.x += 100;
+		bounds.w -= 100;
+		bounds.h = (vdp->flags2 & FLAG2_REGION_PAL) ? 313 : 262;
+		if (nk_input_is_mouse_hovering_rect(&context->input, bounds)) {
+			int off_y = context->input.mouse.pos.y - bounds.y;
+			int off_x = context->input.mouse.pos.x - bounds.x;
+			pixel_t pix = vdp->debug_fbs[DEBUG_CRAM][off_y * vdp->debug_fb_pitch[DEBUG_CRAM] / sizeof(pixel_t) + off_x];
+#ifdef USE_GLES
+			pixel_t b = pix >> 20 & 0xE, g = pix >> 12 & 0xE, r = pix >> 4 & 0xE;
+#else
+			pixel_t r = pix >> 20 & 0xE, g = pix >> 12 & 0xE, b = pix >> 4 & 0xE;
+#endif
+			pix = b << 8 | g << 4 | r;
+			snprintf(buf, sizeof(buf), "Line: %d, Index: %d, Value: %03X", off_y- vdp->border_top, off_x >> 3, pix & 0xFFFFFF);
+			nk_layout_space_push(context, nk_rect(100, 512 - 32*5, windows[DEBUG_CRAM].tex_width, 32));
+			nk_label(context, buf, NK_TEXT_LEFT);
+		}
+		bounds.y += 512-32*4;
+		bounds.h = 32*4;
+		if (nk_input_is_mouse_hovering_rect(&context->input, bounds)) {
+			int index = ((((int)(context->input.mouse.pos.y - bounds.y)) >> 1) & 0xF0) + (((int)(context->input.mouse.pos.x - bounds.x)) >> 5);
+			snprintf(buf, sizeof(buf), "Index: %2d, Value: %03X", index, vdp->cram[index]);
+			nk_layout_space_push(context, nk_rect(100, 512 - 32*5, windows[DEBUG_CRAM].tex_width, 32));
+			nk_label(context, buf, NK_TEXT_LEFT);
+		}
+		
+		static struct nk_scroll scroll;
+		context->style.window.scrollbar_size.y = 0;
+		nk_layout_space_push(context, nk_rect(0, 0, 100, windows[DEBUG_CRAM].tex_height));
+		if (nk_group_scrolled_begin(context, &scroll, "Entries", 0)) {
+			nk_layout_space_begin(context, NK_STATIC, windows[DEBUG_CRAM].tex_height * 4, INT_MAX);
+			for (int i = 0; i < 64; i++)
+			{
+				nk_layout_space_push(context, nk_rect(0, i *32, 25, 32));
+				snprintf(buf, sizeof(buf), "%d", i);
+				nk_label(context, buf, NK_TEXT_RIGHT);
+				nk_layout_space_push(context, nk_rect(30, i *32, 50, 32));
+				snprintf(buf, sizeof(buf), "%03X", vdp->cram[i] & 0xEEE);
+				nk_edit_string_zero_terminated(context, NK_EDIT_FIELD, buf, sizeof(buf), nk_filter_hex);
+				char *end;
+				long newv = strtol(buf, &end, 16);
+				if (end != buf && newv != vdp->cram[i]) {
+					write_cram_internal(vdp, i, newv & 0xEEE);
+				}
+			}
+			nk_layout_space_end(context);
+			nk_group_scrolled_end(context);
+		}
+		
+		nk_end(context);
+	}
+	nk_sdl_render(context, NK_ANTI_ALIASING_ON, 512 * 1024, 128 * 1024);
+	
+	nk_input_begin(context);
+}
+#endif
+
+uint8_t debug_create_window(uint8_t debug_type, char *caption, uint32_t width, uint32_t height, window_close_handler close_handler)
+{
+#ifndef DISABLE_OPENGL
+	if (!render_has_gl()) {
+#endif
+		return render_create_window(caption, width, height, close_handler);
+#ifndef DISABLE_OPENGL
+	}
+	uint32_t win_width = width, win_height = height;
+	ui_render_fun render = NULL;
+	switch (debug_type)
+	{
+	case DEBUG_CRAM:
+		win_width += 100;
+		render = cram_debug_ui;
+		break;
+	}
+	if (render) {
+		//compensate for padding
+		win_width += 4 * 2;
+		win_height += 4 * 2;
+		windows[debug_type].win_idx = render_create_window_tex(caption, win_width, win_height, width, height, close_handler);
+		windows[debug_type].tex_width = width;
+		windows[debug_type].tex_height = width;
+		windows[debug_type].context = shared_nuklear_init(windows[debug_type].win_idx);
+		render_set_ui_render_fun(windows[debug_type].win_idx, render);
+		render_set_event_handler(windows[debug_type].win_idx, debug_handle_event);
+		return windows[debug_type].win_idx;
+	} else {
+		return render_create_window(caption, width, height, close_handler);
+	}
+#endif
+}