kdrive/fbdev: Add DRI3 support through glamor

Signed-off-by: stefan11111 <stefan11111github@gmail.com>

hw/kdrive/fbdev/fb_glamor.c

@@ -18,7 +18,12 @@
 #include "kxv.h"
 #endif
 
+#ifdef WITH_LIBDRM
+#include <xf86drm.h>
+#endif
+
 char *fbdev_glvnd_provider = NULL;
+char *fbdev_dri_path = NULL;
 
 bool es_allowed = TRUE;
 bool force_es = FALSE;
@@ -29,10 +34,31 @@ bool fbXVAllowed = TRUE;
 Bool
 fbdevInitAccel(ScreenPtr pScreen)
 {
+#ifdef WITH_LIBDRM
+    KdScreenPriv(pScreen);
+    KdScreenInfo *screen = pScreenPriv->screen;
+    FbdevScrPriv *scrpriv = screen->driver;
+
+    if (fbdev_dri_path) {
+        scrpriv->dri_fd = open(fbdev_dri_path, O_RDWR);
+        if (scrpriv->dri_fd >= 0) {
+            drmSetMaster(scrpriv->dri_fd);
+        } else {
+            perror("open");
+        }
+    } else {
+        scrpriv->dri_fd = -1;
+    }
+#endif
+
     glamor_egl_conf_t glamor_egl_conf = {
                                          .screen = pScreen,
                                          .glvnd_vendor = fbdev_glvnd_provider,
-                                         .fd = -1,
+#ifdef WITH_LIBDRM
+                                         .fd = scrpriv->dri_fd,
+#else
+                                         .fd = -1;
+#endif
                                          .llvmpipe_allowed = TRUE,
                                          .force_glamor = TRUE,
                                          .es_disallowed = !es_allowed,
@@ -45,7 +71,7 @@ fbdevInitAccel(ScreenPtr pScreen)
 
     const char *renderer = (const char*)glGetString(GL_RENDERER);
 
-    int flags = GLAMOR_USE_EGL_SCREEN | GLAMOR_NO_DRI3;
+    int flags = GLAMOR_USE_EGL_SCREEN;
     if (!fbGlamorAllowed) {
         flags |= GLAMOR_NO_RENDER_ACCEL;
     } else if (!fbForceGlamor){
@@ -56,6 +82,14 @@ fbdevInitAccel(ScreenPtr pScreen)
         }
     }
 
+#ifdef WITH_LIBDRM
+    if (scrpriv->dri_fd < 0 ||
+        flags & GLAMOR_NO_RENDER_ACCEL)
+#endif
+    {
+        flags |= GLAMOR_NO_DRI3;
+    }
+
     if (!glamor_init(pScreen, flags)) {
         return FALSE;
     }
@@ -85,6 +119,13 @@ fbdevDisableAccel(ScreenPtr screen)
 void
 fbdevFiniAccel(ScreenPtr pScreen)
 {
-    /* Handled by CloseScreen */
-    (void)pScreen;
+#ifdef WITH_LIBDRM
+    KdScreenPriv(pScreen);
+    KdScreenInfo *screen = pScreenPriv->screen;
+    FbdevScrPriv *scrpriv = screen->driver;
+
+    if (scrpriv->dri_fd >= 0) {
+        close(scrpriv->dri_fd);
+    }
+#endif
 }

hw/kdrive/fbdev/fbdev.c

@@ -30,6 +30,10 @@
 
 #include "fbdev.h"
 
+#if defined (GLAMOR) && defined (WITH_LIBDRM)
+#include <xf86drm.h>
+#endif
+
 const char *fbdevDevicePath = NULL;
 Bool fbDisableShadow = FALSE;
 
@@ -755,6 +759,14 @@ fbdevEnable(ScreenPtr pScreen)
 {
     KdScreenPriv(pScreen);
     FbdevPriv *priv = pScreenPriv->card->driver;
+#if defined (GLAMOR) && defined (WITH_LIBDRM)
+    KdScreenInfo *screen = pScreenPriv->screen;
+    FbdevScrPriv *scrpriv = screen->driver;
+
+    if (scrpriv->dri_fd >= 0) {
+        drmSetMaster(scrpriv->dri_fd);
+    }
+#endif
     int k;
 
     priv->var.activate = FB_ACTIVATE_NOW | FB_CHANGE_CMAP_VBL;
@@ -810,6 +822,15 @@ fbdevDPMS(ScreenPtr pScreen, int mode)
 void
 fbdevDisable(ScreenPtr pScreen)
 {
+#if defined (GLAMOR) && defined (WITH_LIBDRM)
+    KdScreenPriv(pScreen);
+    KdScreenInfo *screen = pScreenPriv->screen;
+    FbdevScrPriv *scrpriv = screen->driver;
+
+    if (scrpriv->dri_fd >= 0) {
+        drmDropMaster(scrpriv->dri_fd);
+    }
+#endif
 }
 
 void

hw/kdrive/fbdev/fbdev.h

@@ -47,6 +47,9 @@ typedef struct _fbdevPriv {
 typedef struct _fbdevScrPriv {
     Rotation randr;
     Bool shadow;
+#if defined (GLAMOR) && defined (WITH_LIBDRM)
+    int dri_fd;
+#endif
 } FbdevScrPriv;
 
 extern KdCardFuncs fbdevFuncs;
@@ -55,6 +58,7 @@ extern Bool fbDisableShadow;
 
 #ifdef GLAMOR
 extern char *fbdev_glvnd_provider;
+extern char *fbdev_dri_path;
 extern bool es_allowed;
 extern bool force_es;
 extern bool fbGlamorAllowed;

hw/kdrive/fbdev/fbinit.c

@@ -70,6 +70,8 @@ ddxUseMsg(void)
     ErrorF("\nXfbdev Device Usage:\n");
     ErrorF
         ("-fb path         Framebuffer device to use. Defaults to /dev/fb0\n");
+    ErrorF
+        ("-dri path        Optional drm device path to use\n");
     ErrorF
         ("-noshadow        Disable the ShadowFB layer if possible\n");
     ErrorF
@@ -124,6 +126,15 @@ ddxProcessArgument(int argc, char **argv, int i)
         exit(1);
     }
 
+    if (!strcmp(argv[i], "-dri")) {
+        if (i + 1 < argc) {
+            fbdev_dri_path = strdup(argv[i + 1]);
+            return 2;
+        }
+        UseMsg();
+        exit(1);
+    }
+
     if (!strcmp(argv[i], "-force-gl")) {
         es_allowed = FALSE;
         return 1;

hw/kdrive/fbdev/meson.build

@@ -18,7 +18,7 @@ xfbdev_server = executable(
         include_directories('../src'),
         include_directories('../linux'),
     ],
-    dependencies: [ common_dep ],
+    dependencies: [ common_dep, libdrm_dep ],
     link_with: [
         libxserver_main,
         fbdev_glamor,