[client] egl: added DMA texture support for direct upload

Note: This only works with the KVMFR kernel module in a VM->VM
configuration. If this causes issues it can be disabled with the new
option `app:allowDMA`

client/src/config.c

@@ -84,6 +84,13 @@ static struct Option options[] =
     .type          = OPTION_TYPE_INT,
     .value.x_int   = 1000
   },
+  {
+    .module        = "app",
+    .name          = "allowDMA",
+    .description   = "Allow direct DMA transfers if possible (VM-VM only for now)",
+    .type          = OPTION_TYPE_BOOL,
+    .value.x_bool  = true
+  },
 
   // window options
   {
@@ -401,6 +408,7 @@ bool config_load(int argc, char * argv[])
   // setup the application params for the basic types
   params.cursorPollInterval = option_get_int   ("app", "cursorPollInterval");
   params.framePollInterval  = option_get_int   ("app", "framePollInterval" );
+  params.allowDMA           = option_get_bool  ("app", "allowDMA"          );
 
   params.windowTitle   = option_get_string("win", "title"        );
   params.autoResize    = option_get_bool  ("win", "autoResize"   );

client/src/main.c

@@ -375,7 +375,10 @@ static int frameThread(void * unused)
 
   //FIXME: Should use LGMP_Q_FRAME_LEN
   struct DMAFrameInfo dmaInfo[2] = {0};
-  const bool useDMA = ivshmemHasDMA(&state.shm) && state.lgr->supports &&
+  const bool useDMA =
+    params.allowDMA &&
+    ivshmemHasDMA(&state.shm) &&
+    state.lgr->supports &&
     state.lgr->supports(state.lgrData, LG_SUPPORTS_DMABUF);
 
   if (useDMA)
@@ -479,7 +482,7 @@ static int frameThread(void * unused)
           frame->width, frame->height,
           frame->stride, frame->pitch);
 
-      if (!state.lgr->on_frame_format(state.lgrData, lgrFormat))
+      if (!state.lgr->on_frame_format(state.lgrData, lgrFormat, useDMA))
       {
         DEBUG_ERROR("renderer failed to configure format");
         state.state = APP_STATE_SHUTDOWN;
@@ -557,7 +560,6 @@ static int frameThread(void * unused)
 
     atomic_fetch_add_explicit(&state.frameCount, 1, memory_order_relaxed);
     lgSignalEvent(e_frame);
-
     lgmpClientMessageDone(queue);
   }
 

client/src/main.h

@@ -158,6 +158,7 @@ struct AppParams
 
   unsigned int cursorPollInterval;
   unsigned int framePollInterval;
+  bool         allowDMA;
 
   bool         forceRenderer;
   unsigned int forceRendererIndex;