sm64/enhancements/record_demo.patch

diff --git a/src/game/game.c b/src/game/game.c
index ad800839..810e2ba3 100644
--- a/src/game/game.c
+++ b/src/game/game.c
@@ -52,6 +52,45 @@ struct DemoInput *gCurrDemoInput = NULL; // demo input sequence
 u16 gDemoInputListID = 0;
 struct DemoInput gRecordedDemoInput = { 0 }; // possibly removed in EU. TODO: Check
 
+/*
+ * This enhancement allows you to record gameplay demos for the mario head screen.
+ *
+ * Note:
+ * This enhancement does require the lastest versions of PJ64 from the nightly builds,
+ * because it uses the javascript API to automatically dump the demo files from RAM
+ * once the demo is completed. See enhancements/RecordDemo.js for more info
+ *
+*/
+
+#include "../src/game/mario.h"
+
+#define DEMOREC_STATUS_NOT_RECORDING 0
+#define DEMOREC_STATUS_PREPARING 1
+#define DEMOREC_STATUS_RECORDING 2
+#define DEMOREC_STATUS_STOPPING 3
+#define DEMOREC_STATUS_DONE 4
+
+#define DEMOREC_PRINT_X 10
+#define DEMOREC_PRINT_Y 10
+
+#define DEMOREC_DONE_DELAY 60 // Show "DONE" message for 2 seconds.
+
+#define DEMOREC_MAX_INPUTS 1025 // Max number of recorded inputs.
+
+/*
+    DO NOT REMOVE, MODIFY, OR MAKE A COPY OF THIS EXACT STRING!
+    This is here so that the js dump script can find the control variables easily.
+*/
+char gDemoRecTag[] = "DEMORECVARS";
+
+// Control variables. It is easier if they are each 4 byte aligned, which is why they are u32.
+u32 gRecordingStatus = DEMOREC_STATUS_NOT_RECORDING;
+u32 gDoneDelay = 0;
+u32 gNumOfRecordedInputs = 0;
+struct DemoInput gRecordedInputs[DEMOREC_MAX_INPUTS];
+struct DemoInput* gRecordedInputsPtr = (struct DemoInput*)gRecordedInputs;
+struct DemoInput gRecordedDemoInputCopy;
+
 // this function records distinct inputs over a 255-frame interval to RAM locations and was likely
 // used to record the demo sequences seen in the final game. This function is unused.
 static void record_demo(void) {
@@ -85,6 +124,118 @@ static void record_demo(void) {
     gRecordedDemoInput.timer++;
 }
 
+void record_new_demo_input(void) {
+    if(gRecordedDemoInput.timer == 1 && gRecordedDemoInputCopy.timer > 0) {
+        gRecordedInputs[gNumOfRecordedInputs].timer = gRecordedDemoInputCopy.timer;
+        gRecordedInputs[gNumOfRecordedInputs + 1].timer = 0;
+        gRecordedInputs[gNumOfRecordedInputs].rawStickX = gRecordedDemoInputCopy.rawStickX;
+        gRecordedInputs[gNumOfRecordedInputs + 1].rawStickX = gRecordedDemoInputCopy.rawStickX;
+        gRecordedInputs[gNumOfRecordedInputs].rawStickY = gRecordedDemoInputCopy.rawStickY;
+        gRecordedInputs[gNumOfRecordedInputs + 1].rawStickY = gRecordedDemoInputCopy.rawStickY;
+        gRecordedInputs[gNumOfRecordedInputs].buttonMask = gRecordedDemoInputCopy.buttonMask;
+        gRecordedInputs[gNumOfRecordedInputs + 1].buttonMask = gRecordedDemoInputCopy.buttonMask;
+        gNumOfRecordedInputs++;
+    }
+}
+
+// Self explanitory
+void copy_gRecordedDemoInput(void) {
+    gRecordedDemoInputCopy.timer = gRecordedDemoInput.timer;
+    gRecordedDemoInputCopy.rawStickX = gRecordedDemoInput.rawStickX;
+    gRecordedDemoInputCopy.rawStickY = gRecordedDemoInput.rawStickY;
+    gRecordedDemoInputCopy.buttonMask = gRecordedDemoInput.buttonMask;
+}
+
+// Runs when the demo is recording.
+void recording(void) {
+
+    // Force-stop when someone makes too many inputs.
+    if(gNumOfRecordedInputs + 1 > DEMOREC_MAX_INPUTS) {
+        gRecordingStatus = DEMOREC_STATUS_STOPPING;
+        return;
+    }
+
+    copy_gRecordedDemoInput();
+    record_demo(); // Defined in game.c
+    record_new_demo_input();
+}
+
+// Makes sure the last demo input is zeroed out, to make it look more clean.
+void record_cleanup(void) {
+    gRecordedInputs[gNumOfRecordedInputs].timer = 0;
+    gRecordedInputs[gNumOfRecordedInputs].rawStickX = 0;
+    gRecordedInputs[gNumOfRecordedInputs].rawStickY = 0;
+    gRecordedInputs[gNumOfRecordedInputs].buttonMask = 0;
+
+    // Make sure the done delay is reset before moving to DONE status.
+    gDoneDelay = 0;
+}
+
+void record_run(void) {
+    switch(gRecordingStatus) {
+        case DEMOREC_STATUS_NOT_RECORDING:
+            break;
+        case DEMOREC_STATUS_PREPARING:
+            if(gMarioObject != NULL && gCurrLevelNum >= 5) { // If the game is in an active level
+                gRecordingStatus = DEMOREC_STATUS_RECORDING;
+
+                // A bit of a hack, but it works.
+                gNumOfRecordedInputs = 1;
+                gRecordedInputs[0].timer = gCurrLevelNum;
+                gRecordedInputs[0].rawStickX = 0;
+                gRecordedInputs[0].rawStickY = 0;
+                gRecordedInputs[0].buttonMask = 0;
+            }
+            break;
+        case DEMOREC_STATUS_RECORDING:
+            recording();
+            break;
+        case DEMOREC_STATUS_DONE:
+            if(gDoneDelay > DEMOREC_DONE_DELAY)
+                gRecordingStatus = DEMOREC_STATUS_NOT_RECORDING;
+            else
+                gDoneDelay++;
+            break;
+    }
+}
+
+// Prints the status on the bottom-left side of the screen in colorful text.
+void print_status(void) {
+    switch(gRecordingStatus) {
+        case DEMOREC_STATUS_PREPARING:
+            print_text(DEMOREC_PRINT_X, DEMOREC_PRINT_Y, "READY");
+            break;
+        case DEMOREC_STATUS_RECORDING:
+            print_text(DEMOREC_PRINT_X, DEMOREC_PRINT_Y, "REC");
+            break;
+        case DEMOREC_STATUS_STOPPING:
+            print_text(DEMOREC_PRINT_X, DEMOREC_PRINT_Y, "WAIT");
+            break;
+        case DEMOREC_STATUS_DONE:
+            print_text(DEMOREC_PRINT_X, DEMOREC_PRINT_Y, "DONE");
+            break;
+    }
+}
+
+// Main function that should be called from thread5_game_loop()
+void recordingDemo(void) {
+    // Mario needs to enter directly into a level and not from a warp,
+    // so the debug level select is used for that.
+    gDebugLevelSelect = TRUE;
+
+    if(gPlayer1Controller->buttonPressed & L_TRIG) {
+        if(gRecordingStatus == DEMOREC_STATUS_NOT_RECORDING) {
+            gRecordingStatus = DEMOREC_STATUS_PREPARING;
+        } else if (gRecordingStatus == DEMOREC_STATUS_RECORDING) {
+            gRecordingStatus = DEMOREC_STATUS_STOPPING;
+            record_cleanup();
+        }
+    }
+
+    record_run();
+    print_status();
+}
+
 // take the updated controller struct and calculate
 // the new x, y, and distance floats.
 void adjust_analog_stick(struct Controller *controller) {
@@ -325,6 +476,7 @@ void thread5_game_loop(UNUSED void *arg) {
         audio_game_loop_tick();
         func_80247FAC();
         read_controller_inputs();
+        recordingDemo();
         addr = level_script_execute(addr);
         display_and_vsync();