modesetting: Add support for rendering using glamor.

By default modesetting now tries to enable X acceleration using
glamor, but falls back to normal shadowfb if GL fails to initialize.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Keith Packard <keithp@keithp.com>

hw/xfree86/drivers/modesetting/Makefile.am

@@ -28,6 +28,7 @@ AM_CFLAGS = $(DIX_CFLAGS) $(XORG_CFLAGS) $(LIBDRM_CFLAGS) $(UDEV_CFLAGS) $(CWARN
 
 AM_CPPFLAGS = \
 	$(XORG_INCS) \
+	-I$(top_srcdir)/glamor \
 	-I$(srcdir)/../../ddc \
 	-I$(srcdir)/../../i2c \
 	-I$(srcdir)/../../modes \

hw/xfree86/drivers/modesetting/driver.c

@@ -61,6 +61,11 @@
 
 #include "driver.h"
 
+#ifdef GLAMOR
+#define GLAMOR_FOR_XORG 1
+#include "glamor.h"
+#endif
+
 static void AdjustFrame(ScrnInfoPtr pScrn, int x, int y);
 static Bool CloseScreen(ScreenPtr pScreen);
 static Bool EnterVT(ScrnInfoPtr pScrn);
@@ -122,12 +127,14 @@ typedef enum {
     OPTION_SW_CURSOR,
     OPTION_DEVICE_PATH,
     OPTION_SHADOW_FB,
+    OPTION_ACCEL_METHOD,
 } modesettingOpts;
 
 static const OptionInfoRec Options[] = {
     {OPTION_SW_CURSOR, "SWcursor", OPTV_BOOLEAN, {0}, FALSE},
     {OPTION_DEVICE_PATH, "kmsdev", OPTV_STRING, {0}, FALSE},
     {OPTION_SHADOW_FB, "ShadowFB", OPTV_BOOLEAN, {0}, FALSE},
+    {OPTION_ACCEL_METHOD, "AccelMethod", OPTV_STRING, {0}, FALSE},
     {-1, NULL, OPTV_NONE, {0}, FALSE}
 };
 
@@ -577,6 +584,43 @@ FreeRec(ScrnInfoPtr pScrn)
 
 }
 
+static void
+try_enable_glamor(ScrnInfoPtr pScrn)
+{
+    modesettingPtr ms = modesettingPTR(pScrn);
+    const char *accel_method_str = xf86GetOptValString(ms->Options,
+                                                       OPTION_ACCEL_METHOD);
+    Bool do_glamor = (!accel_method_str ||
+                      strcmp(accel_method_str, "glamor") == 0);
+
+    ms->glamor = FALSE;
+
+#ifdef GLAMOR
+    if (!do_glamor) {
+        xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "glamor disabled\n");
+        return;
+    }
+
+    if (xf86LoadSubModule(pScrn, GLAMOR_EGL_MODULE_NAME)) {
+        if (glamor_egl_init(pScrn, ms->fd)) {
+            xf86DrvMsg(pScrn->scrnIndex, X_INFO, "glamor initialized\n");
+            ms->glamor = TRUE;
+        } else {
+            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+                       "glamor initialization failed\n");
+        }
+    } else {
+        xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+                   "Failed to load glamor module.\n");
+    }
+#else
+    if (do_glamor) {
+        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+                   "No glamor support in the X Server\n");
+    }
+#endif
+}
+
 #ifndef DRM_CAP_CURSOR_WIDTH
 #define DRM_CAP_CURSOR_WIDTH 0x8
 #endif
@@ -594,7 +638,6 @@ PreInit(ScrnInfoPtr pScrn, int flags)
     EntPtr msEnt = NULL;
     char *BusID = NULL;
     const char *devicename;
-    Bool prefer_shadow = TRUE;
     uint64_t value = 0;
     int ret;
     int bppflags;
@@ -732,11 +775,6 @@ PreInit(ScrnInfoPtr pScrn, int flags)
         ms->drmmode.sw_cursor = TRUE;
     }
 
-    ret = drmGetCap(ms->fd, DRM_CAP_DUMB_PREFER_SHADOW, &value);
-    if (!ret) {
-        prefer_shadow = ! !value;
-    }
-
     ms->cursor_width = 64;
     ms->cursor_height = 64;
     ret = drmGetCap(ms->fd, DRM_CAP_CURSOR_WIDTH, &value);
@@ -748,12 +786,26 @@ PreInit(ScrnInfoPtr pScrn, int flags)
         ms->cursor_height = value;
     }
 
-    ms->drmmode.shadow_enable =
+    try_enable_glamor(pScrn);
-        xf86ReturnOptValBool(ms->Options, OPTION_SHADOW_FB, prefer_shadow);
+
+    if (!ms->glamor) {
+        Bool prefer_shadow = TRUE;
+
+        ret = drmGetCap(ms->fd, DRM_CAP_DUMB_PREFER_SHADOW, &value);
+        if (!ret) {
+            prefer_shadow = !!value;
+        }
+
+        ms->drmmode.shadow_enable = xf86ReturnOptValBool(ms->Options,
+                                                         OPTION_SHADOW_FB,
+                                                         prefer_shadow);
+
+        xf86DrvMsg(pScrn->scrnIndex, X_INFO,
+                   "ShadowFB: preferred %s, enabled %s\n",
+                   prefer_shadow ? "YES" : "NO",
+                   ms->drmmode.shadow_enable ? "YES" : "NO");
+    }
 
-    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "ShadowFB: preferred %s, enabled %s\n",
-               prefer_shadow ? "YES" : "NO",
-               ms->drmmode.shadow_enable ? "YES" : "NO");
     if (drmmode_pre_init(pScrn, &ms->drmmode, pScrn->bitsPerPixel / 8) == FALSE) {
         xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "KMS setup failed\n");
         goto fail;
@@ -832,6 +884,20 @@ CreateScreenResources(ScreenPtr pScreen)
     if (!drmmode_set_desired_modes(pScrn, &ms->drmmode))
         return FALSE;
 
+#ifdef GLAMOR
+    if (ms->glamor) {
+        if (!glamor_egl_create_textured_screen_ext(pScreen,
+                                                   ms->drmmode.front_bo->handle,
+                                                   pScrn->displayWidth *
+                                                   pScrn->bitsPerPixel / 8,
+                                                   NULL)) {
+            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+                       "glamor_egl_create_textured_screen_ext() failed\n");
+            return FALSE;
+        }
+    }
+#endif
+
     drmmode_uevent_init(pScrn, &ms->drmmode);
 
     if (!ms->drmmode.sw_cursor)
@@ -984,6 +1050,19 @@ ScreenInit(ScreenPtr pScreen, int argc, char **argv)
 
     fbPictureInit(pScreen, NULL, 0);
 
+#ifdef GLAMOR
+    if (ms->glamor) {
+        if (!glamor_init(pScreen,
+                         GLAMOR_USE_EGL_SCREEN |
+                         GLAMOR_USE_SCREEN |
+                         GLAMOR_USE_PICTURE_SCREEN)) {
+            xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
+                       "Failed to initialize glamor at ScreenInit() time.\n");
+            return FALSE;
+        }
+    }
+#endif
+
     if (ms->drmmode.shadow_enable && !msShadowInit(pScreen)) {
         xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "shadow fb init failed\n");
         return FALSE;

hw/xfree86/drivers/modesetting/driver.h

@@ -74,6 +74,7 @@ typedef struct _modesettingRec {
     Bool dirty_enabled;
 
     uint32_t cursor_width, cursor_height;
+    Bool glamor;
 } modesettingRec, *modesettingPtr;
 
 #define modesettingPTR(p) ((modesettingPtr)((p)->driverPrivate))

hw/xfree86/drivers/modesetting/modesetting.man

@@ -47,6 +47,9 @@ The framebuffer device to use. Default: /dev/dri/card0.
 .BI "Option \*qShadowFB\*q \*q" boolean \*q
 Enable or disable use of the shadow framebuffer layer.  Default: on.
 .TP
+.BI "Option \*qAccelMethod\*q \*q" string \*q
+One of \*qglamor\*q or \*qnone\*q.  Default: glamor
+.TP
 .SH "SEE ALSO"
 __xservername__(__appmansuffix__), __xconfigfile__(__filemansuffix__), Xserver(__appmansuffix__),
 X(__miscmansuffix__)