From e465e241b8a88300b7b8527510d6b643dac10b70 Mon Sep 17 00:00:00 2001
From: Nathaniel Walizer <robots.are.love@gmail.com>
Date: Sun, 11 May 2025 22:39:16 -0700
Subject: [PATCH] Add modal popup support

---
 Makefile         |  2 +-
 src/linux/port.c | 25 +++++++++++++++----------
 src/menu.c       | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 src/menu.h       | 20 ++++++++++++++++++++
 src/port.h       |  5 +++--
 5 files changed, 86 insertions(+), 13 deletions(-)
 create mode 100644 src/menu.c
 create mode 100644 src/menu.h

diff --git a/Makefile b/Makefile
index c1f5ceb..138723a 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ NESE_SRC_SRCS = f6502.c f6502_opcodes.c
 NESE_SRC_SRCS += nese.c nes.c cart.c mapper.c
 NESE_SRC_SRCS += ppu.c apu.c
 NESE_SRC_SRCS += memory.c serdes.c save.c rle.c
-NESE_SRC_SRCS += cartinfo.c
+NESE_SRC_SRCS += cartinfo.c menu.c
 NESE_SRC_SRCS += $(OS)/port.c
 NESE_GFX_SRCS = $(notdir $(wildcard $(GFXDIR)/*.c))
 NESE_MAP_SRCS = $(notdir $(wildcard $(MAPDIR)/*.c))
diff --git a/src/linux/port.c b/src/linux/port.c
index 78626fc..355fb0a 100644
--- a/src/linux/port.c
+++ b/src/linux/port.c
@@ -15,6 +15,7 @@
 #include "save.h"
 #include "draw.h"
 #include "cartinfo.h"
+#include "menu.h"
 
 #define NESE_DEBUG "Port"
 #include "log.h"
@@ -98,11 +99,6 @@ typedef struct {
 
 /* Input */
 
-int nese_update_input(void* plat_data, nes_Input* input) {
-    // Gamepad states are already updated in nese_frame_ready()
-    return 0;
-}
-
 static const int sdl_action_keycodes[Action_Max] = {
     [Action_Menu]  = SDLK_ESCAPE,
     [Action_Reset] = SDLK_BACKSPACE,
@@ -179,6 +175,13 @@ static nese_Action process_events(nes* sys) {
     return action;
 }
 
+nese_Action nese_update_input(void* plat_data, nes_Input* input) {
+    platform_data* plat = (platform_data*)plat_data;
+    nese_Action action = process_events(plat->sys);
+    if (NULL != input) *input = plat->sys->core.memory.input;
+    return action;
+}
+
 
 /*
  * Time / Video - Should be maximally reusable across platforms
@@ -353,8 +356,9 @@ int nese_frame_ready(void* plat_data) {
 
 /* Drawing */
 
-void nese_draw_begin(void* plat_data, int dim) {
-    draw_begin(&((platform_data*)plat_data)->renderer, dim);
+void nese_draw_begin(void* plat_data) {
+    platform_data* plat = (platform_data*)plat_data;
+    draw_begin(&plat->renderer, NULL != plat->cart.filename);
 }
 
 void nese_draw_text(void* plat_data, const char* str, int x, int y, uint32_t c) {
@@ -422,14 +426,15 @@ int main(int argc, char* argv[]) {
 
     if (0 == status) {
         if (argc <= 1) {
-            LOGI("No ROM file provided.");
+            modal_popup(&plat, "No ROM file provided.", color_error);
             status = -1;
 
         } else {
             status = load_cart(&plat.cart, argv[1], &sys);
             if (0 != status) {
-                LOGE("Failed to load %s", argv[1]);
-                // TODO: Error modal on load failure
+                char message[128];
+                snprintf(message, sizeof(message), "Failed to load %s", argv[1]);
+                modal_popup(&plat, message, color_error);
             }
         }
 
diff --git a/src/menu.c b/src/menu.c
new file mode 100644
index 0000000..5767cdc
--- /dev/null
+++ b/src/menu.c
@@ -0,0 +1,47 @@
+#include "menu.h"
+#include "nes.h"
+#include "action.h"
+#include "port.h"
+
+
+static nese_Action wait_for_input(void* plat, uint8_t* new_buttons) {
+    nes_Input input = {0};
+    nese_Action action = nese_update_input(plat, &input);
+    uint8_t changed = 0;
+
+    while (0 == changed && Action_OK == action) {
+        // TODO: Sleep
+        uint8_t buttons = input.gamepads[0].buttons;
+        action = nese_update_input(plat, &input);
+        changed = (~buttons & input.gamepads[0].buttons);
+    }
+
+    if (NULL != new_buttons) *new_buttons = input.gamepads[0].buttons;
+
+    return action;
+}
+
+
+int modal_popup(void* plat, const char* message, uint32_t color) {
+    int w = 0;
+    int h = 0;
+
+    nese_text_size(plat, message, &w, &h);
+
+    int x = ((int)nes_ppu_render_w - w) / 2;
+    int y = ((int)nes_ppu_render_h - h) / 2;
+
+    if (x < 5) x = 5;
+    if (y < 5) y = 5;
+
+    nese_Action action = 0;
+    uint8_t buttons = 0;
+    while (0 == action && 0 == buttons) {
+        nese_draw_begin(plat);
+        nese_draw_text(plat, message, x, y, color);
+        nese_draw_finish(plat);
+        action = wait_for_input(plat, &buttons);
+    }
+
+    return action;
+}
diff --git a/src/menu.h b/src/menu.h
new file mode 100644
index 0000000..d2be6d7
--- /dev/null
+++ b/src/menu.h
@@ -0,0 +1,20 @@
+#ifndef NESE_MENU_H_
+#define NESE_MENU_H_
+
+#include "cartinfo.h"
+
+
+typedef struct {
+	int cursor;
+	int top;
+} Menu_State;
+
+
+int run_rom_menu(void*, Menu_State*, const Cart_Info*, char* file, int sz_file);
+
+int run_game_menu(void*, Menu_State*);
+
+int modal_popup(void*, const char* message, uint32_t color);
+
+
+#endif // NESE_MENU_H_
diff --git a/src/port.h b/src/port.h
index 1abd841..9ed0d42 100644
--- a/src/port.h
+++ b/src/port.h
@@ -4,6 +4,7 @@
 #include <stdio.h>
 
 #include "input.h"
+#include "action.h"
 
 
 int nese_file_size(FILE* file);
@@ -23,7 +24,7 @@ int nese_frame_start(void*, uint8_t background);
 int nese_line_ready(void*, uint8_t* buffer, int line);
 int nese_frame_ready(void*);
 
-int nese_update_input(void*, nes_Input*);
+nese_Action nese_update_input(void*, nes_Input*);
 
 int nese_get_audio_frequency(void*);
 
@@ -33,7 +34,7 @@ void* nese_alloc_cpu(int);
 void* nese_alloc(int);
 
 
-void nese_draw_begin(void*, int dim);
+void nese_draw_begin(void*);
 void nese_draw_text(void*, const char*, int x, int y, uint32_t color);
 void nese_text_size(void*, const char*, int* w, int* h);
 void nese_draw_finish(void*);