libretro: Use memset() to set the initial TIC-80 state (#2591)

src/system/libretro/tic80_libretro.c

@@ -125,7 +125,7 @@ void tic80_libretro_error(const char* info)
 	if (environ_cb) {
 		struct retro_message msg = {
 			info,
-			400
+			6 * TIC80_FRAMERATE
 		};
 		environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, &msg);
 	}
@@ -176,23 +176,12 @@ RETRO_API void retro_init(void)
 		return;
 	}
 
-	// Initialize the base state.
+	// Initialize the base state with some default values.
 	state = (struct tic80_state*) malloc(sizeof(struct tic80_state));
-	state->quit = false;
-	state->cropBorder = false;
-	state->pointerDevice = POINTER_DEVICE_MOUSE;
+	memset(state, 0, sizeof(struct tic80_state));
 	state->pointerSpeed = 1.0f;
-	state->slowGamepadMouse = false;
-	state->mouseCursor = MOUSE_CURSOR_NONE;
 	state->mouseCursorColor = 15;
 	state->analogDeadzone = (int)(0.15f * (float)RETRO_ANALOG_RANGE);
-	state->mouseX = 0;
-	state->mouseY = 0;
-	state->mousePreviousX = 0;
-	state->mousePreviousY = 0;
-	state->mouseXAccumulator = 0.0f;
-	state->mouseYAccumulator = 0.0f;
-	state->mouseHideTimer = state->mouseHideTimerStart;
 
 	// Initialize the keyboard mappings.
 	state->keymap[RETROK_UNKNOWN] = tic_key_unknown;
@@ -766,7 +755,7 @@ void tic80_libretro_update_mouse(tic80_mouse* mouse)
 		state->mousePreviousX = state->mouseX;
 		state->mousePreviousY = state->mouseY;
 	}
-	if (state->mouseHideTimer > 0) {
+	else if (state->mouseHideTimer > 0) {
 		state->mouseHideTimer--;
 	}
 
@@ -782,14 +771,16 @@ void tic80_libretro_update_mouse(tic80_mouse* mouse)
 void tic80_libretro_mousecursor(tic80* game, tic80_mouse* mouse, enum mouse_cursor_type cursortype)
 {
 	TIC_UNUSED(mouse);
+
 	// Only draw the mouse cursor if it's active.
-	if (state->mouseHideTimer == 0) {
+	if (state->mouseHideTimerStart > 0 && state->mouseHideTimer == 0) {
 		return;
 	}
 
 	tic_mem* tic = (tic_mem*)state->tic;
 
-	// Determine which cursor to draw.
+	// Draw the cursor.
+	// TODO: Fix the cursor not being drawn on the screen by possibly modifing game->screen directly.
 	switch (cursortype) {
 		case MOUSE_CURSOR_NONE:
 			// Nothing.
@@ -974,16 +965,18 @@ void tic80_libretro_variables(bool startup)
 	}
 
 	// Mouse Hide Delay
-	state->mouseHideTimerStart = -1;
+	state->mouseHideTimerStart = 0;
 	var.key = "tic80_mouse_hide_delay";
 	var.value = NULL;
 	if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
 		state->mouseHideTimerStart = atoi(var.value);
 		if (state->mouseHideTimerStart > 0) {
 			state->mouseHideTimerStart = state->mouseHideTimerStart * TIC80_FRAMERATE;
+			state->mouseHideTimer = state->mouseHideTimerStart;
 		}
 		else {
-			state->mouseHideTimerStart = -1;
+			state->mouseHideTimerStart = 0;
+			state->mouseHideTimer = 0;
 		}
 	}