null: Add a null software winsys.

One where framebuffer data will be read via texture transfers.

Useful for e.g., python state tracker.

configs/default

@@ -100,7 +100,7 @@ GALLIUM_DIRS = auxiliary drivers state_trackers
 GALLIUM_AUXILIARIES = $(TOP)/src/gallium/auxiliary/libgallium.a
 GALLIUM_DRIVERS_DIRS = softpipe failover svga i915 i965 r300 trace identity
 GALLIUM_DRIVERS = $(foreach DIR,$(GALLIUM_DRIVERS_DIRS),$(TOP)/src/gallium/drivers/$(DIR)/lib$(DIR).a)
-GALLIUM_WINSYS_DIRS = drm xlib
+GALLIUM_WINSYS_DIRS = drm null xlib
 GALLIUM_TARGET_DIRS = libgl-xlib
 GALLIUM_WINSYS_DRM_DIRS = swrast
 GALLIUM_STATE_TRACKERS_DIRS = glx vega

src/gallium/winsys/SConscript

@@ -1,5 +1,9 @@
 Import('*')
 
+SConscript([
+    'null/SConscript',
+])
+
 if env['dri']:
 	SConscript([
 		'drm/SConscript',

src/gallium/winsys/null/Makefile

@@ -0,0 +1,16 @@
+TOP = ../../../..
+include $(TOP)/configs/current
+
+LIBNAME = ws_null
+
+LIBRARY_INCLUDES = \
+	-I$(TOP)/src/gallium/include \
+	-I$(TOP)/src/gallium/drivers \
+	-I$(TOP)/src/gallium/auxiliary
+
+C_SOURCES = \
+	null_sw_winsys.c 
+
+include ../../Makefile.template
+
+

src/gallium/winsys/null/SConscript

@@ -0,0 +1,21 @@
+#######################################################################
+# SConscript for xlib winsys
+
+
+Import('*')
+
+env = env.Clone()
+
+env.Append(CPPPATH = [
+    '#/src/gallium/include',
+    '#/src/gallium/auxiliary',
+    '#/src/gallium/drivers',
+])
+
+ws_null = env.ConvenienceLibrary(
+    target = 'ws_null',
+    source = [
+       'null_sw_winsys.c',
+    ]
+)
+Export('ws_null')

src/gallium/winsys/null/null_sw_winsys.c

@@ -0,0 +1,124 @@
+/**************************************************************************
+ * 
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ **************************************************************************/
+
+/**
+ * @file
+ * Null software rasterizer winsys.
+ * 
+ * There is no present support. Framebuffer data needs to be obtained via
+ * transfers.
+ *
+ * @author Jose Fonseca
+ */
+
+
+#include "pipe/p_format.h"
+#include "util/u_memory.h"
+#include "state_tracker/sw_winsys.h"
+#include "null_sw_winsys.h"
+
+
+static boolean
+null_sw_is_displaytarget_format_supported(struct sw_winsys *ws,
+                                          enum pipe_format format )
+{
+   return FALSE;
+}
+
+
+static void *
+null_sw_displaytarget_map(struct sw_winsys *ws,
+                          struct sw_displaytarget *dt,
+                          unsigned flags )
+{
+   assert(0);
+   return NULL;
+}
+
+
+static void
+null_sw_displaytarget_unmap(struct sw_winsys *ws,
+                            struct sw_displaytarget *dt )
+{
+   assert(0);
+}
+
+
+static void
+null_sw_displaytarget_destroy(struct sw_winsys *winsys,
+                              struct sw_displaytarget *dt)
+{
+   assert(0);
+}
+
+
+static struct sw_displaytarget *
+null_sw_displaytarget_create(struct sw_winsys *winsys,
+                             enum pipe_format format,
+                             unsigned width, unsigned height,
+                             unsigned alignment,
+                             unsigned *stride)
+{
+   return NULL;
+}
+
+
+static void
+null_sw_displaytarget_display(struct sw_winsys *winsys,
+                              struct sw_displaytarget *dt,
+                              void *context_private)
+{
+   assert(0);
+}
+
+
+static void
+null_sw_destroy(struct sw_winsys *winsys)
+{
+   FREE(winsys);
+}
+
+
+struct sw_winsys *
+null_sw_create(void)
+{
+   static struct sw_winsys *winsys;
+
+   winsys = CALLOC_STRUCT(sw_winsys);
+   if (!winsys)
+      return NULL;
+
+   winsys->destroy = null_sw_destroy;
+   winsys->is_displaytarget_format_supported = null_sw_is_displaytarget_format_supported;
+   winsys->displaytarget_create = null_sw_displaytarget_create;
+   winsys->displaytarget_map = null_sw_displaytarget_map;
+   winsys->displaytarget_unmap = null_sw_displaytarget_unmap;
+   winsys->displaytarget_display = null_sw_displaytarget_display;
+   winsys->displaytarget_destroy = null_sw_displaytarget_destroy;
+
+   return winsys;
+}

src/gallium/winsys/null/null_sw_winsys.h

@@ -0,0 +1,40 @@
+/**************************************************************************
+ *
+ * Copyright 2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ **************************************************************************/
+
+
+#ifndef NULL_SW_WINSYS_H_
+#define NULL_SW_WINSYS_H_
+
+
+struct sw_winsys;
+
+
+struct sw_winsys *
+null_sw_create(void);
+
+
+#endif /* NULL_SW_WINSYS_H_ */