[VIDEOPRT] Add global variable for debugging video drivers (#3080)

Reference: https://docs.microsoft.com/en-us/previous-versions/ff570170(v=vs.85)

diff --git a/win32ss/drivers/videoprt/videoprt.c b/win32ss/drivers/videoprt/videoprt.c
index a59d044..edce0fe 100644 (file)
--- a/win32ss/drivers/videoprt/videoprt.c
+++ b/win32ss/drivers/videoprt/videoprt.c
@@ -31,6 +31,8 @@
 
 /* GLOBAL VARIABLES ***********************************************************/
 
 
 /* GLOBAL VARIABLES ***********************************************************/
 

+ULONG VideoDebugLevel = 0;
+

 BOOLEAN VpBaseVideo = FALSE;
 BOOLEAN VpNoVesa = FALSE;
 
 BOOLEAN VpBaseVideo = FALSE;
 BOOLEAN VpNoVesa = FALSE;
 


@@ -294,6 +296,8 @@ IntVideoPortFindAdapter(
                                       SystemBasicInfo.PageSize;
     }
 
                                       SystemBasicInfo.PageSize;
     }
 

+    // FIXME: Check the adapter key and update VideoDebugLevel variable.
+

     /*
      * Call miniport HwVidFindAdapter entry point to detect if
      * particular device is present. There are two possible code
     /*
      * Call miniport HwVidFindAdapter entry point to detect if
      * particular device is present. There are two possible code


@@ -794,6 +798,9 @@ VideoPortDebugPrint(
 {
     va_list ap;
 
 {
     va_list ap;
 

+    if (VideoDebugLevel >= DebugPrintLevel)
+        DebugPrintLevel = Error;
+

     va_start(ap, DebugMessage);
     vDbgPrintEx(DPFLTR_IHVVIDEO_ID, DebugPrintLevel, DebugMessage, ap);
     va_end(ap);
     va_start(ap, DebugMessage);
     vDbgPrintEx(DPFLTR_IHVVIDEO_ID, DebugPrintLevel, DebugMessage, ap);
     va_end(ap);