egl_dri2: use gbm_surface as the native window type in drm platform

src/egl/drivers/dri2/egl_dri2.h

@@ -177,6 +177,17 @@ struct dri2_egl_surface
    int			  format;
 #endif
 
+#ifdef HAVE_DRM_PLATFORM
+   struct gbm_dri_surface *gbm_surf;
+   struct {
+      struct gbm_bo       *bo;
+      int                  locked;
+   } color_buffers[3], *back, *current;
+#ifndef HAVE_WAYLAND_PLATFORM
+   __DRIbuffer           *dri_buffers[__DRI_BUFFER_COUNT];
+#endif
+#endif
+
 #ifdef HAVE_ANDROID_PLATFORM
    struct ANativeWindow *window;
    struct ANativeWindowBuffer *buffer;

src/egl/drivers/dri2/platform_drm.c

@@ -37,6 +37,307 @@
 
 #include "egl_dri2.h"
 
+static struct gbm_bo *
+lock_front_buffer(struct gbm_surface *_surf)
+{
+   struct gbm_dri_surface *surf = (struct gbm_dri_surface *) _surf;
+   struct dri2_egl_surface *dri2_surf = surf->dri_private;
+   struct gbm_bo *bo;
+
+   if (dri2_surf->current == NULL) {
+      _eglError(EGL_BAD_SURFACE, "no front buffer");
+      return NULL;
+   }
+
+   bo = dri2_surf->current->bo;
+   dri2_surf->current->locked = 1;
+   dri2_surf->current = NULL;
+
+   return bo;
+}
+
+static void
+release_buffer(struct gbm_surface *_surf, struct gbm_bo *bo)
+{
+   struct gbm_dri_surface *surf = (struct gbm_dri_surface *) _surf;
+   struct dri2_egl_surface *dri2_surf = surf->dri_private;
+   int i;
+
+   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
+      if (dri2_surf->color_buffers[i].bo == bo) {
+	 dri2_surf->color_buffers[i].locked = 0;
+      }
+   }
+}
+
+static int
+has_free_buffers(struct gbm_surface *_surf)
+{
+   struct gbm_dri_surface *surf = (struct gbm_dri_surface *) _surf;
+   struct dri2_egl_surface *dri2_surf = surf->dri_private;
+   int i;
+
+   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++)
+      if (!dri2_surf->color_buffers[i].locked)
+	 return 1;
+
+   return 0;
+}
+
+static _EGLSurface *
+dri2_create_surface(_EGLDriver *drv, _EGLDisplay *disp, EGLint type,
+		    _EGLConfig *conf, EGLNativeWindowType window,
+		    const EGLint *attrib_list)
+{
+   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
+   struct dri2_egl_config *dri2_conf = dri2_egl_config(conf);
+   struct dri2_egl_surface *dri2_surf;
+   struct gbm_dri_surface *surf;
+
+   (void) drv;
+
+   dri2_surf = malloc(sizeof *dri2_surf);
+   if (!dri2_surf) {
+      _eglError(EGL_BAD_ALLOC, "dri2_create_surface");
+      return NULL;
+   }
+
+   memset(dri2_surf, 0, sizeof *dri2_surf);
+   if (!_eglInitSurface(&dri2_surf->base, disp, type, conf, attrib_list))
+      goto cleanup_surf;
+
+   switch (type) {
+   case EGL_WINDOW_BIT:
+      surf = gbm_dri_surface((struct gbm_surface *) window);
+      dri2_surf->gbm_surf = surf;
+      dri2_surf->base.Width =  surf->base.width;
+      dri2_surf->base.Height = surf->base.height;
+      surf->dri_private = dri2_surf;
+      break;
+   default:
+      goto cleanup_surf;
+   }
+
+   dri2_surf->dri_drawable =
+      (*dri2_dpy->dri2->createNewDrawable) (dri2_dpy->dri_screen,
+					    dri2_conf->dri_double_config,
+					    dri2_surf->gbm_surf);
+
+   if (dri2_surf->dri_drawable == NULL) {
+      _eglError(EGL_BAD_ALLOC, "dri2->createNewDrawable");
+      goto cleanup_surf;
+   }
+
+   return &dri2_surf->base;
+
+ cleanup_surf:
+   free(dri2_surf);
+
+   return NULL;
+}
+
+static _EGLSurface *
+dri2_create_window_surface(_EGLDriver *drv, _EGLDisplay *disp,
+			   _EGLConfig *conf, EGLNativeWindowType window,
+			   const EGLint *attrib_list)
+{
+   return dri2_create_surface(drv, disp, EGL_WINDOW_BIT, conf,
+			      window, attrib_list);
+}
+
+static EGLBoolean
+dri2_destroy_surface(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *surf)
+{
+   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
+   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surf);
+   int i;
+
+   if (!_eglPutSurface(surf))
+      return EGL_TRUE;
+
+   (*dri2_dpy->core->destroyDrawable)(dri2_surf->dri_drawable);
+
+   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
+      if (dri2_surf->color_buffers[i].bo)
+	 gbm_bo_destroy(dri2_surf->color_buffers[i].bo);
+   }
+
+   for (i = 0; i < __DRI_BUFFER_COUNT; i++) {
+      if (dri2_surf->dri_buffers[i])
+         dri2_dpy->dri2->releaseBuffer(dri2_dpy->dri_screen,
+                                       dri2_surf->dri_buffers[i]);
+   }
+
+   free(surf);
+
+   return EGL_TRUE;
+}
+
+static int
+get_back_bo(struct dri2_egl_surface *dri2_surf, __DRIbuffer *buffer)
+{
+   struct dri2_egl_display *dri2_dpy =
+      dri2_egl_display(dri2_surf->base.Resource.Display);
+   struct gbm_dri_bo *bo;
+   struct gbm_dri_surface *surf = dri2_surf->gbm_surf;
+   int i, name, pitch;
+
+   if (dri2_surf->back == NULL) {
+      for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
+	 if (!dri2_surf->color_buffers[i].locked) {
+	    dri2_surf->back = &dri2_surf->color_buffers[i];
+	    break;
+	 }
+      }
+   }
+
+   if (dri2_surf->back == NULL)
+      return -1;
+   if (dri2_surf->back->bo == NULL)
+      dri2_surf->back->bo = gbm_bo_create(&dri2_dpy->gbm_dri->base.base,
+					  surf->base.width, surf->base.height,
+					  surf->base.format, surf->base.flags);
+   if (dri2_surf->back->bo == NULL)
+      return -1;
+
+   bo = (struct gbm_dri_bo *) dri2_surf->back->bo;
+
+   dri2_dpy->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_NAME, &name);
+   dri2_dpy->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_STRIDE, &pitch);
+
+   buffer->attachment = __DRI_BUFFER_BACK_LEFT;
+   buffer->name = name;
+   buffer->pitch = pitch;
+   buffer->cpp = 4;
+   buffer->flags = 0;
+
+   return 0;
+}
+
+static int
+get_aux_bo(struct dri2_egl_surface *dri2_surf,
+	   unsigned int attachment, unsigned int format, __DRIbuffer *buffer)
+{
+   struct dri2_egl_display *dri2_dpy =
+      dri2_egl_display(dri2_surf->base.Resource.Display);
+   __DRIbuffer *b;
+
+   b = NULL;
+   if (dri2_surf->dri_buffers[attachment])
+      b = dri2_surf->dri_buffers[attachment];
+   if (b == NULL)
+      b = dri2_dpy->dri2->allocateBuffer(dri2_dpy->dri_screen,
+					 attachment, format,
+					 dri2_surf->base.Width,
+					 dri2_surf->base.Height);
+   if (b == NULL)
+      return -1;
+
+   memcpy(buffer, b, sizeof *buffer);
+
+   return 0;
+}
+
+static __DRIbuffer *
+dri2_get_buffers_with_format(__DRIdrawable *driDrawable,
+			     int *width, int *height,
+			     unsigned int *attachments, int count,
+			     int *out_count, void *loaderPrivate)
+{
+   struct dri2_egl_surface *dri2_surf = loaderPrivate;
+   int i, j;
+
+   dri2_surf->buffer_count = 0;
+   for (i = 0, j = 0; i < 2 * count; i += 2, j++) {
+      assert(attachments[i] < __DRI_BUFFER_COUNT);
+      assert(dri2_surf->buffer_count < 5);
+
+      switch (attachments[i]) {
+      case __DRI_BUFFER_BACK_LEFT:
+	 if (get_back_bo(dri2_surf, &dri2_surf->buffers[j]) < 0) {
+	    _eglError(EGL_BAD_ALLOC, "failed to allocate color buffer");
+	    return NULL;
+	 }
+	 break;
+      default:
+	 if (get_aux_bo(dri2_surf, attachments[i], attachments[i + 1],
+			&dri2_surf->buffers[j]) < 0) {
+	    _eglError(EGL_BAD_ALLOC, "failed to allocate aux buffer");
+	    return NULL;
+	 }
+	 break;
+      }
+   }
+
+   *out_count = j;
+   if (j == 0)
+      return NULL;
+
+   *width = dri2_surf->base.Width;
+   *height = dri2_surf->base.Height;
+
+   return dri2_surf->buffers;
+}
+
+static __DRIbuffer *
+dri2_get_buffers(__DRIdrawable * driDrawable,
+		 int *width, int *height,
+		 unsigned int *attachments, int count,
+		 int *out_count, void *loaderPrivate)
+{
+   unsigned int *attachments_with_format;
+   __DRIbuffer *buffer;
+   const unsigned int format = 32;
+   int i;
+
+   attachments_with_format = calloc(count * 2, sizeof(unsigned int));
+   if (!attachments_with_format) {
+      *out_count = 0;
+      return NULL;
+   }
+
+   for (i = 0; i < count; ++i) {
+      attachments_with_format[2*i] = attachments[i];
+      attachments_with_format[2*i + 1] = format;
+   }
+
+   buffer =
+      dri2_get_buffers_with_format(driDrawable,
+				   width, height,
+				   attachments_with_format, count,
+				   out_count, loaderPrivate);
+
+   free(attachments_with_format);
+
+   return buffer;
+}
+
+static void
+dri2_flush_front_buffer(__DRIdrawable * driDrawable, void *loaderPrivate)
+{
+   (void) driDrawable;
+   (void) loaderPrivate;
+}
+
+static EGLBoolean
+dri2_swap_buffers(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *draw)
+{
+   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
+   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(draw);
+
+   if (dri2_surf->base.Type == EGL_WINDOW_BIT) {
+      if (dri2_surf->current)
+	 _eglError(EGL_BAD_SURFACE, "dri2_swap_buffers");
+      dri2_surf->current = dri2_surf->back;
+      dri2_surf->back = NULL;
+   }
+
+   (*dri2_dpy->flush->flush)(dri2_surf->dri_drawable);
+   (*dri2_dpy->flush->invalidate)(dri2_surf->dri_drawable);
+
+   return EGL_TRUE;
+}
+
 static _EGLImage *
 dri2_create_image_khr_pixmap(_EGLDisplay *disp, _EGLContext *ctx,
 			     EGLClientBuffer buffer, const EGLint *attr_list)
@@ -147,12 +448,23 @@ dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
    dri2_dpy->gbm_dri->lookup_image = dri2_lookup_egl_image;
    dri2_dpy->gbm_dri->lookup_user_data = disp;
 
+   dri2_dpy->gbm_dri->get_buffers = dri2_get_buffers;
+   dri2_dpy->gbm_dri->flush_front_buffer = dri2_flush_front_buffer;
+   dri2_dpy->gbm_dri->get_buffers_with_format = dri2_get_buffers_with_format;
+
+   dri2_dpy->gbm_dri->base.base.surface_lock_front_buffer = lock_front_buffer;
+   dri2_dpy->gbm_dri->base.base.surface_release_buffer = release_buffer;
+   dri2_dpy->gbm_dri->base.base.surface_has_free_buffers = has_free_buffers;
+
    dri2_setup_screen(disp);
 
    for (i = 0; dri2_dpy->driver_configs[i]; i++)
       dri2_add_config(disp, dri2_dpy->driver_configs[i],
-                      i + 1, 0, 0, NULL, NULL);
+                      i + 1, 0, EGL_WINDOW_BIT, NULL, NULL);
 
+   drv->API.CreateWindowSurface = dri2_create_window_surface;
+   drv->API.DestroySurface = dri2_destroy_surface;
+   drv->API.SwapBuffers = dri2_swap_buffers;
    drv->API.CreateImageKHR = dri2_drm_create_image_khr;
 
 #ifdef HAVE_WAYLAND_PLATFORM