winsys/drm: Add name field to drm_api.

The name can be used for driver selection.  It has the same name as the
DRI driver does right now.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>

src/gallium/include/state_tracker/drm_api.h

@@ -28,6 +28,8 @@ struct drm_create_screen_arg {
 
 struct drm_api
 {
+        const char *name;
+
 	/**
 	 * Special buffer functions
 	 */

src/gallium/winsys/drm/i965/gem/i965_drm_api.c

@@ -228,6 +228,7 @@ destroy(struct drm_api *api)
 
 struct drm_api i965_libdrm_api =
 {
+   .name = "i965",
    .create_context = i965_libdrm_create_context,
    .create_screen = i965_libdrm_create_screen,
    .texture_from_shared_handle = i965_libdrm_texture_from_shared_handle,

src/gallium/winsys/drm/intel/gem/intel_drm_api.c

@@ -195,6 +195,7 @@ destroy(struct drm_api *api)
 
 struct drm_api intel_drm_api =
 {
+   .name = "i915",
    .create_context = intel_drm_create_context,
    .create_screen = intel_drm_create_screen,
    .texture_from_shared_handle = intel_drm_texture_from_shared_handle,

src/gallium/winsys/drm/nouveau/drm/nouveau_drm_api.c

@@ -254,6 +254,7 @@ nouveau_drm_handle_from_pt(struct drm_api *api, struct pipe_screen *pscreen,
 }
 
 struct drm_api drm_api_hooks = {
+	.name = "nouveau",
 	.create_screen = nouveau_drm_create_screen,
 	.create_context = nouveau_drm_create_context,
 	.texture_from_shared_handle = nouveau_drm_pt_from_name,

src/gallium/winsys/drm/radeon/core/radeon_drm.c

@@ -252,6 +252,7 @@ static boolean radeon_local_handle_from_texture(struct drm_api *api,
 }
 
 struct drm_api drm_api_hooks = {
+    .name = "radeon",
     .create_screen = radeon_create_screen,
     .create_context = radeon_create_context,
     .texture_from_shared_handle = radeon_texture_from_shared_handle,

src/gallium/winsys/drm/vmware/core/vmw_screen_dri.c

@@ -358,6 +358,7 @@ static struct dri1_api dri1_api_hooks = {
 };
 
 static struct drm_api vmw_drm_api_hooks = {
+   .name = "vmwgfx",
    .create_screen = vmw_drm_create_screen,
    .create_context = vmw_drm_create_context,
    .texture_from_shared_handle = vmw_drm_texture_from_handle,