egl_xdri: Add support for DRISW.

Try DRISW if both DRI2 and DRI fail.  It can also be forced by setting
EGL_SOFTWARE.  When DRISW is used, single-buffered modes are ignored.

3 files changed, 42 insertions, 15 deletions

diff --git a/src/egl/drivers/xdri/Makefile b/src/egl/drivers/xdri/Makefile
index 8e748b71cd..9120620dc5 100644
--- a/src/egl/drivers/xdri/Makefile
+++ b/src/egl/drivers/xdri/Makefile
@@ -6,7 +6,7 @@ include $(TOP)/configs/current
 EGL_DRIVER = egl_xdri.so
 
 # steal sources from GLX
-GLX_SOURCES = dri_common.c XF86dri.c dri2.c dri2_glx.c dri_glx.c
+GLX_SOURCES = dri_common.c XF86dri.c dri2.c dri2_glx.c dri_glx.c drisw_glx.c
 GLX_SOURCES := $(addprefix ../../../glx/x11/,$(GLX_SOURCES))
 GLX_INCLUDES = \
 	$(shell pkg-config --cflags-only-I libdrm) \
diff --git a/src/egl/drivers/xdri/driinit.c b/src/egl/drivers/xdri/driinit.c
index 12da1bcd24..3e54f0bd4d 100644
--- a/src/egl/drivers/xdri/driinit.c
+++ b/src/egl/drivers/xdri/driinit.c
@@ -2,6 +2,7 @@
  * DRI initialization.  The DRI loaders are defined in src/glx/x11/.
  */
 
+#include <stdlib.h>
 #include <sys/time.h>
 
 #include "glxclient.h"
@@ -42,18 +43,26 @@ __glXEnableDirectExtension(__GLXscreenConfigs * psc, const char *name)
 _X_HIDDEN __GLXDRIdisplay *
 __driCreateDisplay(__GLXdisplayPrivate *dpyPriv, int *version)
 {
-   __GLXDRIdisplay *driDisplay;
+   __GLXDRIdisplay *driDisplay = NULL;
    int ver = 0;
+   char *env;
+   int force_sw;
+
+   env = getenv("EGL_SOFTWARE");
+   force_sw = (env && *env != '0');
 
    /* try DRI2 first */
-   driDisplay = dri2CreateDisplay(dpyPriv->dpy);
-   if (driDisplay) {
-      /* fill in the required field */
-      dpyPriv->dri2Display = driDisplay;
-      ver = 2;
+   if (!force_sw) {
+      driDisplay = dri2CreateDisplay(dpyPriv->dpy);
+      if (driDisplay) {
+         /* fill in the required field */
+         dpyPriv->dri2Display = driDisplay;
+         ver = 2;
+      }
    }
-   else {
-      /* try DRI */
+
+   /* and then DRI */
+   if (!force_sw && !driDisplay) {
       driDisplay = driCreateDisplay(dpyPriv->dpy);
       if (driDisplay) {
          dpyPriv->driDisplay = driDisplay;
@@ -61,6 +70,15 @@ __driCreateDisplay(__GLXdisplayPrivate *dpyPriv, int *version)
       }
    }
 
+   /* and then DRISW */
+   if (!driDisplay) {
+      driDisplay = driswCreateDisplay(dpyPriv->dpy);
+      if (driDisplay) {
+         dpyPriv->driDisplay = driDisplay;
+         ver = 0;
+      }
+   }
+
    if (version)
       *version = ver;
    return driDisplay;
diff --git a/src/egl/drivers/xdri/egl_xdri.c b/src/egl/drivers/xdri/egl_xdri.c
index f83da6652f..b133939155 100644
--- a/src/egl/drivers/xdri/egl_xdri.c
+++ b/src/egl/drivers/xdri/egl_xdri.c
@@ -72,6 +72,7 @@ struct xdri_egl_display
    Display *dpy;
    __GLXdisplayPrivate *dpyPriv;
    __GLXDRIdisplay *driDisplay;
+   int driVersion;
 
    __GLXscreenConfigs *psc;
    EGLint scr;
@@ -212,6 +213,7 @@ convert_config(_EGLConfig *conf, EGLint id, const __GLcontextModes *m)
 static EGLint
 create_configs(_EGLDisplay *disp, const __GLcontextModes *m, EGLint first_id)
 {
+   struct xdri_egl_display *xdri_dpy = lookup_display(disp);
    int id = first_id;
 
    for (; m; m = m->next) {
@@ -221,8 +223,15 @@ create_configs(_EGLDisplay *disp, const __GLcontextModes *m, EGLint first_id)
 
       if (!convert_config(&conf, id, m))
          continue;
-
-      rb = (m->doubleBufferMode) ? EGL_BACK_BUFFER : EGL_SINGLE_BUFFER;
+      if (m->doubleBufferMode) {
+         rb = EGL_BACK_BUFFER;
+      }
+      else {
+         /* ignore single-buffered mode for DRISW */
+         if (xdri_dpy->driVersion == 0)
+            continue;
+         rb = EGL_SINGLE_BUFFER;
+      }
 
       xdri_conf = CALLOC_STRUCT(xdri_egl_config);
       if (xdri_conf) {
@@ -272,7 +281,7 @@ xdri_eglInitialize(_EGLDriver *drv, _EGLDisplay *dpy,
       return _eglError(EGL_NOT_INITIALIZED, "eglInitialize");
    }
 
-   driDisplay = __driCreateDisplay(dpyPriv, NULL);
+   driDisplay = __driCreateDisplay(dpyPriv, &xdri_dpy->driVersion);
    if (!driDisplay) {
       _eglLog(_EGL_WARNING, "failed to create DRI display");
       free(xdri_dpy);
@@ -294,13 +303,13 @@ xdri_eglInitialize(_EGLDriver *drv, _EGLDisplay *dpy,
       return _eglError(EGL_NOT_INITIALIZED, "eglInitialize");
    }
 
+   dpy->DriverData = xdri_dpy;
+   dpy->ClientAPIsMask = EGL_OPENGL_BIT;
+
    /* add visuals and fbconfigs */
    first_id = create_configs(dpy, psc->visuals, first_id);
    create_configs(dpy, psc->configs, first_id);
 
-   dpy->DriverData = xdri_dpy;
-   dpy->ClientAPIsMask = EGL_OPENGL_BIT;
-
    /* we're supporting EGL 1.4 */
    *minor = 1;
    *major = 4;