gallium: introduce 'pipe_screen' for context-independent functions

This will allow creating textures before a rendering context exists, for example.
Only implemented in i915 driver for now.  i915pipe->texture_create() just
dispatches through to the i915screen->texture_create() to avoid state tracker
changes for now.

1 files changed, 139 insertions, 0 deletions

diff --git a/src/gallium/drivers/i915simple/i915_screen.c b/src/gallium/drivers/i915simple/i915_screen.c
new file mode 100644
index 0000000000..7e9d971d38
--- /dev/null
+++ b/src/gallium/drivers/i915simple/i915_screen.c
@@ -0,0 +1,139 @@
+/**************************************************************************
+ * 
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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 above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ * 
+ * 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 TUNGSTEN GRAPHICS 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.
+ * 
+ **************************************************************************/
+
+
+#include "pipe/p_util.h"
+#include "pipe/p_winsys.h"
+
+#include "i915_reg.h"
+#include "i915_screen.h"
+#include "i915_texture.h"
+
+
+static const char *
+i915_get_vendor( struct pipe_screen *pscreen )
+{
+   return "Tungsten Graphics, Inc.";
+}
+
+
+static const char *
+i915_get_name( struct pipe_screen *pscreen )
+{
+   static char buffer[128];
+   const char *chipset;
+
+   switch (i915_screen(pscreen)->pci_id) {
+   case PCI_CHIP_I915_G:
+      chipset = "915G";
+      break;
+   case PCI_CHIP_I915_GM:
+      chipset = "915GM";
+      break;
+   case PCI_CHIP_I945_G:
+      chipset = "945G";
+      break;
+   case PCI_CHIP_I945_GM:
+      chipset = "945GM";
+      break;
+   case PCI_CHIP_I945_GME:
+      chipset = "945GME";
+      break;
+   case PCI_CHIP_G33_G:
+      chipset = "G33";
+      break;
+   case PCI_CHIP_Q35_G:
+      chipset = "Q35";
+      break;
+   case PCI_CHIP_Q33_G:
+      chipset = "Q33";
+      break;
+   default:
+      chipset = "unknown";
+      break;
+   }
+
+   sprintf(buffer, "i915 (chipset: %s)", chipset);
+   return buffer;
+}
+
+
+
+static void
+i915_destroy_screen( struct pipe_screen *screen )
+{
+   FREE(screen);
+}
+
+
+/**
+ * Create a new i915_screen object
+ */
+struct pipe_screen *
+i915_create_screen(struct pipe_winsys *winsys, uint pci_id)
+{
+   struct i915_screen *i915screen = CALLOC_STRUCT(i915_screen);
+
+   if (!i915screen)
+      return NULL;
+
+   switch (pci_id) {
+   case PCI_CHIP_I915_G:
+   case PCI_CHIP_I915_GM:
+      i915screen->is_i945 = FALSE;
+      break;
+
+   case PCI_CHIP_I945_G:
+   case PCI_CHIP_I945_GM:
+   case PCI_CHIP_I945_GME:
+   case PCI_CHIP_G33_G:
+   case PCI_CHIP_Q33_G:
+   case PCI_CHIP_Q35_G:
+      i915screen->is_i945 = TRUE;
+      break;
+
+   default:
+      winsys->printf(winsys, 
+                     "%s: unknown pci id 0x%x, cannot create screen\n", 
+                     __FUNCTION__, pci_id);
+      return NULL;
+   }
+
+   i915screen->pci_id = pci_id;
+
+   i915screen->screen.winsys = winsys;
+
+   i915screen->screen.destroy = i915_destroy_screen;
+
+   i915screen->screen.get_name = i915_get_name;
+   i915screen->screen.get_vendor = i915_get_vendor;
+
+   i915_init_screen_string_functions(&i915screen->screen);
+   i915_init_screen_texture_functions(&i915screen->screen);
+
+   return &i915screen->screen;
+}