Initial commit

backends/graphics/atari/atari-supervidel.cpp

@@ -0,0 +1,67 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "atari-supervidel.h"
+
+#include "common/scummsys.h"
+
+bool g_hasSuperVidel = false;
+
+#ifdef USE_SUPERVIDEL
+
+#ifdef USE_SV_BLITTER
+int g_superVidelFwVersion = 0;
+const byte *g_blitMask = nullptr;
+
+static bool isSuperBlitterLocked;
+
+void SyncSuperBlitter() {
+	// if externally locked, let the owner decide when to sync (unlock)
+	if (isSuperBlitterLocked)
+		return;
+
+	// while FIFO not empty...
+	if (g_superVidelFwVersion >= 9)
+		while (!(*SV_BLITTER_FIFO & 1));
+	// while busy blitting...
+	while (*SV_BLITTER_CONTROL & 1);
+}
+#endif	// USE_SV_BLITTER
+
+void LockSuperBlitter() {
+#ifdef USE_SV_BLITTER
+	assert(!isSuperBlitterLocked);
+
+	isSuperBlitterLocked = true;
+#endif
+}
+
+void UnlockSuperBlitter() {
+#ifdef USE_SV_BLITTER
+	assert(isSuperBlitterLocked);
+
+	isSuperBlitterLocked = false;
+	if (g_hasSuperVidel)
+		SyncSuperBlitter();
+#endif
+}
+
+#endif	// USE_SUPERVIDEL