1 files changed, 33 insertions, 0 deletions
diff --git a/src/win95/vramtime.c b/src/win95/vramtime.c
new file mode 100644
index 0000000..a4fae03
--- /dev/null
+++ b/src/win95/vramtime.c
@@ -0,0 +1,33 @@
+#include <windows.h>
+
+#include "vramtime.h"
+
+static DWORD transition_times_matrix[][VWS_MAXSTATES] =
+{
+/* from DDRELEASE */
+	{   0,  20,   0, 100, 100 },
+/* from D3DTEXRELEASE */
+	{  20,   0, 100, 100, 100 },
+/* from DDCREATE */
+	{   0, 100,   0,  20, 100 },
+/* from D3DTEXCREATE */
+	{  20, 100,  20,  20, 100 },
+/* from UNKNOWN */
+	{ 100, 100, 100, 100, 100 }
+};
+
+
+void WaitForVRamReady(VRAM_WAIT_STATE vws)
+{
+	static DWORD old_time = 0;
+	static VRAM_WAIT_STATE old_vws = VWS_UNKNOWN;
+	
+	DWORD new_time;
+
+	if (0==old_time) old_time = timeGetTime();
+
+	do new_time = timeGetTime(); while (new_time - old_time < transition_times_matrix[old_vws][vws]);
+
+	old_time = new_time;
+	old_vws = vws;
+}