From 5f0f48fc8bcacb7ef52e3b5301e40b2f467e14ca Mon Sep 17 00:00:00 2001
From: Simon Gellis <simongellis@gmail.com>
Date: Tue, 29 Oct 2024 22:33:48 -0400
Subject: [PATCH] Implement pause and reset

---
 emulation.c |  4 ++++
 emulation.h |  1 +
 ui.c        | 21 +++++++++++++++++----
 3 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/emulation.c b/emulation.c
index e0daae1..23ed044 100644
--- a/emulation.c
+++ b/emulation.c
@@ -31,6 +31,10 @@ void emuLoadGame(EmulationContext *emu, uint8_t *rom, uint32_t romSize) {
     vbSetCartROM(emu->sim, rom, romSize);
 }
 
+void emuReset(EmulationContext *emu) {
+    vbReset(emu->sim);
+}
+
 #define MAX_STEP_CLOCKS 20000000
 void emuTick(EmulationContext *emu) {
     uint32_t clocks = MAX_STEP_CLOCKS;
diff --git a/emulation.h b/emulation.h
index da6e849..c931146 100644
--- a/emulation.h
+++ b/emulation.h
@@ -19,6 +19,7 @@ typedef struct EmulationContext {
 int emuInit(EmulationContext *emu);
 void emuDestroy(EmulationContext *emu);
 void emuLoadGame(EmulationContext *emu, uint8_t *rom, uint32_t romSize);
+void emuReset(EmulationContext *emu);
 
 void emuTick(EmulationContext *emu);
 bool emuReadPixels(EmulationContext *emu, uint8_t *left, uint8_t *right);
diff --git a/ui.c b/ui.c
index f60acf6..f20a013 100644
--- a/ui.c
+++ b/ui.c
@@ -94,9 +94,15 @@ static const char *MENU_ITEMS[3] = {
     NULL
 };
 
+typedef enum status_t {
+    status_paused,
+    status_running
+} status_t;
+
 int uiRun(UIContext *ui) {
     static uint8_t leftEye[384*224];
     static uint8_t rightEye[384*224];
+    status_t status = status_running;
 
     while (1) {
         struct nk_context *ctx;
@@ -105,7 +111,9 @@ int uiRun(UIContext *ui) {
         uint32_t bytes;
         ctx = ui->win.nk;
 
-        emuTick(&ui->emu);
+        if (status == status_running) {
+            emuTick(&ui->emu);
+        }
 
         if (emuReadPixels(&ui->emu, leftEye, rightEye)) {
             windowUpdate(&ui->win, leftEye, rightEye);
@@ -135,12 +143,17 @@ int uiRun(UIContext *ui) {
             }
 
             if (nk_menu_begin_label(ctx, "Emulation", NK_TEXT_ALIGN_CENTERED, nk_vec2(120, windowGetScreenHeight(&ui->win)))) {
+                const char *label = status == status_paused ? "Resume" : "Pause";
                 nk_layout_row_dynamic(ctx, MENU_HEIGHT + 2, 1);
-                if (nk_menu_item_label(ctx, "Pause", NK_TEXT_ALIGN_LEFT)) {
-                    printf("Pause\n");
+                if (nk_menu_item_label(ctx, label, NK_TEXT_ALIGN_LEFT)) {
+                    if (status == status_paused)
+                        status = status_running;
+                    else
+                        status = status_paused;
                 }
                 if (nk_menu_item_label(ctx, "Reset", NK_TEXT_ALIGN_LEFT)) {
-                    printf("Reset\n");
+                    emuReset(&ui->emu);
+                    status = status_running;
                 }
                 nk_menu_end(ctx);
             }