Add Intel i965G/Q DRI driver.

This driver comes from Tungsten Graphics, with a few further modifications by
Intel.

1 files changed, 699 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
new file mode 100644
index 00000000000..affd9051c98
--- /dev/null
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -0,0 +1,699 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 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 "glheader.h"
+#include "context.h"
+#include "framebuffer.h"
+#include "matrix.h"
+#include "renderbuffer.h"
+#include "simple_list.h"
+#include "utils.h"
+#include "vblank.h"
+#include "xmlpool.h"
+
+
+#include "intel_screen.h"
+
+#include "intel_tex.h"
+#include "intel_span.h"
+#include "intel_ioctl.h"
+
+#include "i830_dri.h"
+
+PUBLIC const char __driConfigOptions[] =
+DRI_CONF_BEGIN
+    DRI_CONF_SECTION_PERFORMANCE
+       DRI_CONF_FTHROTTLE_MODE(DRI_CONF_FTHROTTLE_IRQS) 
+       DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_0)
+    DRI_CONF_SECTION_END
+    DRI_CONF_SECTION_QUALITY
+       DRI_CONF_FORCE_S3TC_ENABLE(false)
+       DRI_CONF_ALLOW_LARGE_TEXTURES(1)
+      DRI_CONF_SECTION_END
+DRI_CONF_END;
+const GLuint __driNConfigOptions = 4;
+
+#ifdef USE_NEW_INTERFACE
+static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
+#endif /*USE_NEW_INTERFACE*/
+
+extern const struct dri_extension card_extensions[];
+
+/**
+ * Map all the memory regions described by the screen.
+ * \return GL_TRUE if success, GL_FALSE if error.
+ */
+GLboolean
+intelMapScreenRegions(__DRIscreenPrivate *sPriv)
+{
+   intelScreenPrivate *intelScreen = (intelScreenPrivate *)sPriv->private;
+
+   if (intelScreen->front.handle) {
+      if (drmMap(sPriv->fd,
+                 intelScreen->front.handle,
+                 intelScreen->front.size,
+                 (drmAddress *)&intelScreen->front.map) != 0) {
+         _mesa_problem(NULL, "drmMap(frontbuffer) failed!");
+         return GL_FALSE;
+      }
+   } else {
+      /* Use the old static allocation method if the server isn't setting up
+       * a movable handle for us.  Add in the front buffer offset from
+       * framebuffer start, as our span routines (unlike other drivers) expect
+       * the renderbuffer address to point to the beginning of the
+       * renderbuffer.
+       */
+      intelScreen->front.map = sPriv->pFB + intelScreen->front.offset;
+      if (intelScreen->front.map == NULL) {
+	 fprintf(stderr, "Failed to find framebuffer mapping\n");
+	 return GL_FALSE;
+      }
+   }
+
+   if (drmMap(sPriv->fd,
+              intelScreen->back.handle,
+              intelScreen->back.size,
+              (drmAddress *)&intelScreen->back.map) != 0) {
+      intelUnmapScreenRegions(intelScreen);
+      return GL_FALSE;
+   }
+
+   if (drmMap(sPriv->fd,
+              intelScreen->depth.handle,
+              intelScreen->depth.size,
+              (drmAddress *)&intelScreen->depth.map) != 0) {
+      intelUnmapScreenRegions(intelScreen);
+      return GL_FALSE;
+   }
+
+   if (drmMap(sPriv->fd,
+              intelScreen->tex.handle,
+              intelScreen->tex.size,
+              (drmAddress *)&intelScreen->tex.map) != 0) {
+      intelUnmapScreenRegions(intelScreen);
+      return GL_FALSE;
+   }
+
+   if (0)
+      printf("Mappings:  front: %p  back: %p  depth: %p  tex: %p\n",
+          intelScreen->front.map,
+          intelScreen->back.map,
+          intelScreen->depth.map,
+          intelScreen->tex.map);
+   return GL_TRUE;
+}
+
+
+void
+intelUnmapScreenRegions(intelScreenPrivate *intelScreen)
+{
+#define REALLY_UNMAP 1
+   /* If front.handle is present, we're doing the dynamic front buffer mapping,
+    * but if we've fallen back to static allocation then we shouldn't try to
+    * unmap here.
+    */
+   if (intelScreen->front.handle) {
+#if REALLY_UNMAP
+      if (drmUnmap(intelScreen->front.map, intelScreen->front.size) != 0)
+         printf("drmUnmap front failed!\n");
+#endif
+      intelScreen->front.map = NULL;
+   }
+   if (intelScreen->back.map) {
+#if REALLY_UNMAP
+      if (drmUnmap(intelScreen->back.map, intelScreen->back.size) != 0)
+         printf("drmUnmap back failed!\n");
+#endif
+      intelScreen->back.map = NULL;
+   }
+   if (intelScreen->depth.map) {
+#if REALLY_UNMAP
+      drmUnmap(intelScreen->depth.map, intelScreen->depth.size);
+      intelScreen->depth.map = NULL;
+#endif
+   }
+   if (intelScreen->tex.map) {
+#if REALLY_UNMAP
+      drmUnmap(intelScreen->tex.map, intelScreen->tex.size);
+      intelScreen->tex.map = NULL;
+#endif
+   }
+}
+
+
+static void
+intelPrintDRIInfo(intelScreenPrivate *intelScreen,
+                  __DRIscreenPrivate *sPriv,
+                  I830DRIPtr gDRIPriv)
+{
+   fprintf(stderr, "*** Front size:   0x%x  offset: 0x%x  pitch: %d\n",
+           intelScreen->front.size, intelScreen->front.offset,
+           intelScreen->front.pitch);
+   fprintf(stderr, "*** Back size:    0x%x  offset: 0x%x  pitch: %d\n",
+           intelScreen->back.size, intelScreen->back.offset,
+           intelScreen->back.pitch);
+   fprintf(stderr, "*** Depth size:   0x%x  offset: 0x%x  pitch: %d\n",
+           intelScreen->depth.size, intelScreen->depth.offset,
+           intelScreen->depth.pitch);
+   fprintf(stderr, "*** Rotated size: 0x%x  offset: 0x%x  pitch: %d\n",
+           intelScreen->rotated.size, intelScreen->rotated.offset,
+           intelScreen->rotated.pitch);
+   fprintf(stderr, "*** Texture size: 0x%x  offset: 0x%x\n",
+           intelScreen->tex.size, intelScreen->tex.offset);
+   fprintf(stderr, "*** Memory : 0x%x\n", gDRIPriv->mem);
+}
+
+
+static void
+intelPrintSAREA(volatile drmI830Sarea *sarea)
+{
+   fprintf(stderr, "SAREA: sarea width %d  height %d\n", sarea->width, sarea->height);
+   fprintf(stderr, "SAREA: pitch: %d\n", sarea->pitch);
+   fprintf(stderr,
+           "SAREA: front offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
+           sarea->front_offset, sarea->front_size,
+           (unsigned) sarea->front_handle);
+   fprintf(stderr,
+           "SAREA: back  offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
+           sarea->back_offset, sarea->back_size,
+           (unsigned) sarea->back_handle);
+   fprintf(stderr, "SAREA: depth offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
+           sarea->depth_offset, sarea->depth_size,
+           (unsigned) sarea->depth_handle);
+   fprintf(stderr, "SAREA: tex   offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
+           sarea->tex_offset, sarea->tex_size,
+           (unsigned) sarea->tex_handle);
+   fprintf(stderr, "SAREA: rotation: %d\n", sarea->rotation);
+   fprintf(stderr,
+           "SAREA: rotated offset: 0x%08x  size: 0x%x\n",
+           sarea->rotated_offset, sarea->rotated_size);
+   fprintf(stderr, "SAREA: rotated pitch: %d\n", sarea->rotated_pitch);
+}
+
+
+/**
+ * A number of the screen parameters are obtained/computed from
+ * information in the SAREA.  This function updates those parameters.
+ */
+void
+intelUpdateScreenFromSAREA(intelScreenPrivate *intelScreen,
+                           volatile drmI830Sarea *sarea)
+{
+   intelScreen->width = sarea->width;
+   intelScreen->height = sarea->height;
+
+   intelScreen->front.offset = sarea->front_offset;
+   intelScreen->front.pitch = sarea->pitch * intelScreen->cpp;
+   intelScreen->front.handle = sarea->front_handle;
+   intelScreen->front.size = sarea->front_size;
+
+   intelScreen->back.offset = sarea->back_offset;
+   intelScreen->back.pitch = sarea->pitch * intelScreen->cpp;
+   intelScreen->back.handle = sarea->back_handle;
+   intelScreen->back.size = sarea->back_size;
+			 
+   intelScreen->depth.offset = sarea->depth_offset;
+   intelScreen->depth.pitch = sarea->pitch * intelScreen->cpp;
+   intelScreen->depth.handle = sarea->depth_handle;
+   intelScreen->depth.size = sarea->depth_size;
+
+   intelScreen->tex.offset = sarea->tex_offset;
+   intelScreen->logTextureGranularity = sarea->log_tex_granularity;
+   intelScreen->tex.handle = sarea->tex_handle;
+   intelScreen->tex.size = sarea->tex_size;
+
+   intelScreen->rotated.offset = sarea->rotated_offset;
+   intelScreen->rotated.pitch = sarea->rotated_pitch * intelScreen->cpp;
+   intelScreen->rotated.size = sarea->rotated_size;
+   intelScreen->current_rotation = sarea->rotation;
+#if 0
+   matrix23Rotate(&intelScreen->rotMatrix,
+                  sarea->width, sarea->height, sarea->rotation);
+#endif
+   intelScreen->rotatedWidth = sarea->virtualX;
+   intelScreen->rotatedHeight = sarea->virtualY;
+
+   if (0)
+      intelPrintSAREA(sarea);
+}
+
+
+static GLboolean intelInitDriver(__DRIscreenPrivate *sPriv)
+{
+   intelScreenPrivate *intelScreen;
+   I830DRIPtr         gDRIPriv = (I830DRIPtr)sPriv->pDevPriv;
+   PFNGLXSCRENABLEEXTENSIONPROC glx_enable_extension =
+     (PFNGLXSCRENABLEEXTENSIONPROC) (*dri_interface->getProcAddress("glxEnableExtension"));
+   void * const psc = sPriv->psc->screenConfigs;
+   volatile drmI830Sarea *sarea;
+
+   if (sPriv->devPrivSize != sizeof(I830DRIRec)) {
+      fprintf(stderr,"\nERROR!  sizeof(I830DRIRec) (%d) does not match passed size from device driver (%d)\n", sizeof(I830DRIRec), sPriv->devPrivSize);
+      return GL_FALSE;
+   }
+
+   /* Allocate the private area */
+   intelScreen = (intelScreenPrivate *)CALLOC(sizeof(intelScreenPrivate));
+   if (!intelScreen) {
+      fprintf(stderr,"\nERROR!  Allocating private area failed\n");
+      return GL_FALSE;
+   }
+   /* parse information in __driConfigOptions */
+   driParseOptionInfo (&intelScreen->optionCache,
+		       __driConfigOptions, __driNConfigOptions);
+
+   intelScreen->driScrnPriv = sPriv;
+   sPriv->private = (void *)intelScreen;
+   intelScreen->sarea_priv_offset = gDRIPriv->sarea_priv_offset;
+   sarea = (volatile drmI830Sarea *)
+         (((GLubyte *)sPriv->pSAREA)+intelScreen->sarea_priv_offset);
+
+   intelScreen->deviceID = gDRIPriv->deviceID;
+   intelScreen->mem = gDRIPriv->mem;
+   intelScreen->cpp = gDRIPriv->cpp;
+
+   switch (gDRIPriv->bitsPerPixel) {
+   case 15: intelScreen->fbFormat = DV_PF_555; break;
+   case 16: intelScreen->fbFormat = DV_PF_565; break;
+   case 32: intelScreen->fbFormat = DV_PF_8888; break;
+   }
+			 
+   intelUpdateScreenFromSAREA(intelScreen, sarea);
+
+   if (0)
+      intelPrintDRIInfo(intelScreen, sPriv, gDRIPriv);
+
+   if (!intelMapScreenRegions(sPriv)) {
+      fprintf(stderr,"\nERROR!  mapping regions\n");
+      _mesa_free(intelScreen);
+      sPriv->private = NULL;
+      return GL_FALSE;
+   }
+
+   intelScreen->drmMinor = sPriv->drmMinor;
+
+   /* Determine if IRQs are active? */
+   {
+      int ret;
+      drmI830GetParam gp;
+
+      gp.param = I830_PARAM_IRQ_ACTIVE;
+      gp.value = &intelScreen->irq_active;
+
+      ret = drmCommandWriteRead( sPriv->fd, DRM_I830_GETPARAM,
+				 &gp, sizeof(gp));
+      if (ret) {
+	 fprintf(stderr, "drmI830GetParam: %d\n", ret);
+	 return GL_FALSE;
+      }
+   }
+
+   /* Determine if batchbuffers are allowed */
+   {
+      int ret;
+      drmI830GetParam gp;
+
+      gp.param = I830_PARAM_ALLOW_BATCHBUFFER;
+      gp.value = &intelScreen->allow_batchbuffer;
+
+      ret = drmCommandWriteRead( sPriv->fd, DRM_I830_GETPARAM,
+				 &gp, sizeof(gp));
+      if (ret) {
+	 fprintf(stderr, "drmI830GetParam: (%d) %d\n", gp.param, ret);
+	 return GL_FALSE;
+      }
+   }
+
+   if (glx_enable_extension != NULL) {
+      (*glx_enable_extension)( psc, "GLX_SGI_swap_control" );
+      (*glx_enable_extension)( psc, "GLX_SGI_video_sync" );
+      (*glx_enable_extension)( psc, "GLX_MESA_swap_control" );
+      (*glx_enable_extension)( psc, "GLX_MESA_swap_frame_usage" );
+      (*glx_enable_extension)( psc, "GLX_SGI_make_current_read" );
+      (*glx_enable_extension)( psc, "GLX_MESA_copy_sub_buffer" );
+   }
+   
+   return GL_TRUE;
+}
+
+
+static void intelDestroyScreen(__DRIscreenPrivate *sPriv)
+{
+   intelScreenPrivate *intelScreen = (intelScreenPrivate *)sPriv->private;
+
+   intelUnmapScreenRegions(intelScreen);
+   FREE(intelScreen);
+   sPriv->private = NULL;
+}
+
+static GLboolean intelCreateBuffer( __DRIscreenPrivate *driScrnPriv,
+				    __DRIdrawablePrivate *driDrawPriv,
+				    const __GLcontextModes *mesaVis,
+				    GLboolean isPixmap )
+{
+   intelScreenPrivate *screen = (intelScreenPrivate *) driScrnPriv->private;
+
+   if (isPixmap) {
+      return GL_FALSE; /* not implemented */
+   } else {
+      GLboolean swStencil = (mesaVis->stencilBits > 0 && 
+			     mesaVis->depthBits != 24);
+
+      struct gl_framebuffer *fb = _mesa_create_framebuffer(mesaVis);
+
+      {
+         driRenderbuffer *frontRb
+            = driNewRenderbuffer(GL_RGBA,
+                                 screen->front.map,
+                                 screen->cpp,
+                                 screen->front.offset, screen->front.pitch,
+                                 driDrawPriv);
+         intelSetSpanFunctions(frontRb, mesaVis);
+         _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontRb->Base);
+      }
+
+      if (mesaVis->doubleBufferMode) {
+         driRenderbuffer *backRb
+            = driNewRenderbuffer(GL_RGBA,
+                                 screen->back.map,
+                                 screen->cpp,
+                                 screen->back.offset, screen->back.pitch,
+                                 driDrawPriv);
+         intelSetSpanFunctions(backRb, mesaVis);
+         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backRb->Base);
+      }
+
+      if (mesaVis->depthBits == 16) {
+         driRenderbuffer *depthRb
+            = driNewRenderbuffer(GL_DEPTH_COMPONENT16,
+                                 screen->depth.map,
+                                 screen->cpp,
+                                 screen->depth.offset, screen->depth.pitch,
+                                 driDrawPriv);
+         intelSetSpanFunctions(depthRb, mesaVis);
+         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
+      }
+      else if (mesaVis->depthBits == 24) {
+         driRenderbuffer *depthRb
+            = driNewRenderbuffer(GL_DEPTH_COMPONENT24,
+                                 screen->depth.map,
+                                 screen->cpp,
+                                 screen->depth.offset, screen->depth.pitch,
+                                 driDrawPriv);
+         intelSetSpanFunctions(depthRb, mesaVis);
+         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
+      }
+
+      if (mesaVis->stencilBits > 0 && !swStencil) {
+         driRenderbuffer *stencilRb
+            = driNewRenderbuffer(GL_STENCIL_INDEX8_EXT,
+                                 screen->depth.map,
+                                 screen->cpp,
+                                 screen->depth.offset, screen->depth.pitch,
+                                 driDrawPriv);
+         intelSetSpanFunctions(stencilRb, mesaVis);
+         _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &stencilRb->Base);
+      }
+
+      _mesa_add_soft_renderbuffers(fb,
+                                   GL_FALSE, /* color */
+                                   GL_FALSE, /* depth */
+                                   swStencil,
+                                   mesaVis->accumRedBits > 0,
+                                   GL_FALSE, /* alpha */
+                                   GL_FALSE /* aux */);
+      driDrawPriv->driverPrivate = (void *) fb;
+
+      return (driDrawPriv->driverPrivate != NULL);
+   }
+}
+
+static void intelDestroyBuffer(__DRIdrawablePrivate *driDrawPriv)
+{
+   _mesa_destroy_framebuffer((GLframebuffer *) (driDrawPriv->driverPrivate));
+}
+
+
+/**
+ * Get information about previous buffer swaps.
+ */
+static int
+intelGetSwapInfo( __DRIdrawablePrivate *dPriv, __DRIswapInfo * sInfo )
+{
+   struct intel_context *intel;
+
+   if ( (dPriv == NULL) || (dPriv->driContextPriv == NULL)
+	|| (dPriv->driContextPriv->driverPrivate == NULL)
+	|| (sInfo == NULL) ) {
+      return -1;
+   }
+
+   intel = dPriv->driContextPriv->driverPrivate;
+   sInfo->swap_count = intel->swap_count;
+   sInfo->swap_ust = intel->swap_ust;
+   sInfo->swap_missed_count = intel->swap_missed_count;
+
+   sInfo->swap_missed_usage = (sInfo->swap_missed_count != 0)
+       ? driCalculateSwapUsage( dPriv, 0, intel->swap_missed_ust )
+       : 0.0;
+
+   return 0;
+}
+
+
+/* There are probably better ways to do this, such as an
+ * init-designated function to register chipids and createcontext
+ * functions.
+ */
+extern GLboolean i830CreateContext( const __GLcontextModes *mesaVis,
+				    __DRIcontextPrivate *driContextPriv,
+				    void *sharedContextPrivate);
+
+extern GLboolean i915CreateContext( const __GLcontextModes *mesaVis,
+				   __DRIcontextPrivate *driContextPriv,
+				   void *sharedContextPrivate);
+
+extern GLboolean brwCreateContext( const __GLcontextModes *mesaVis,
+				   __DRIcontextPrivate *driContextPriv,
+				   void *sharedContextPrivate);
+
+
+
+
+static GLboolean intelCreateContext( const __GLcontextModes *mesaVis,
+				   __DRIcontextPrivate *driContextPriv,
+				   void *sharedContextPrivate)
+{
+#if 0
+   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
+   intelScreenPrivate *intelScreen = (intelScreenPrivate *)sPriv->private;
+   switch (intelScreen->deviceID) {
+   case PCI_CHIP_845_G:
+   case PCI_CHIP_I830_M:
+   case PCI_CHIP_I855_GM:
+   case PCI_CHIP_I865_G:
+      return i830CreateContext( mesaVis, driContextPriv, 
+				sharedContextPrivate );
+
+   case PCI_CHIP_I915_G:
+   case PCI_CHIP_I915_GM:
+   case PCI_CHIP_I945_G:
+   case PCI_CHIP_I945_GM:
+      return i915CreateContext( mesaVis, driContextPriv, 
+			       sharedContextPrivate );
+ 
+   default:
+      fprintf(stderr, "Unrecognized deviceID %x\n", intelScreen->deviceID);
+      return GL_FALSE;
+   }
+#else
+   return brwCreateContext( mesaVis, driContextPriv, 
+			    sharedContextPrivate );
+#endif
+}
+
+
+static const struct __DriverAPIRec intelAPI = {
+   .InitDriver      = intelInitDriver,
+   .DestroyScreen   = intelDestroyScreen,
+   .CreateContext   = intelCreateContext,
+   .DestroyContext  = intelDestroyContext,
+   .CreateBuffer    = intelCreateBuffer,
+   .DestroyBuffer   = intelDestroyBuffer,
+   .SwapBuffers     = intelSwapBuffers,
+   .MakeCurrent     = intelMakeCurrent,
+   .UnbindContext   = intelUnbindContext,
+   .GetSwapInfo     = intelGetSwapInfo,
+   .GetMSC          = driGetMSC32,
+   .WaitForMSC      = driWaitForMSC32,
+   .WaitForSBC      = NULL,
+   .SwapBuffersMSC  = NULL,
+   .CopySubBuffer   = intelCopySubBuffer
+};
+
+
+static __GLcontextModes *
+intelFillInModes( unsigned pixel_bits, unsigned depth_bits,
+		 unsigned stencil_bits, GLboolean have_back_buffer )
+{
+   __GLcontextModes * modes;
+   __GLcontextModes * m;
+   unsigned num_modes;
+   unsigned depth_buffer_factor;
+   unsigned back_buffer_factor;
+   GLenum fb_format;
+   GLenum fb_type;
+
+   /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
+    * support pageflipping at all.
+    */
+   static const GLenum back_buffer_modes[] = {
+      GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
+   };
+
+   u_int8_t depth_bits_array[3];
+   u_int8_t stencil_bits_array[3];
+
+
+   depth_bits_array[0] = 0;
+   depth_bits_array[1] = depth_bits;
+   depth_bits_array[2] = depth_bits;
+
+   /* Just like with the accumulation buffer, always provide some modes
+    * with a stencil buffer.  It will be a sw fallback, but some apps won't
+    * care about that.
+    */
+   stencil_bits_array[0] = 0;
+   stencil_bits_array[1] = 0;
+   stencil_bits_array[2] = (stencil_bits == 0) ? 8 : stencil_bits;
+
+   depth_buffer_factor = ((depth_bits != 0) || (stencil_bits != 0)) ? 3 : 1;
+   back_buffer_factor  = (have_back_buffer) ? 3 : 1;
+
+   num_modes = depth_buffer_factor * back_buffer_factor * 4;
+
+    if ( pixel_bits == 16 ) {
+        fb_format = GL_RGB;
+        fb_type = GL_UNSIGNED_SHORT_5_6_5;
+    }
+    else {
+        fb_format = GL_BGRA;
+        fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
+    }
+
+   modes = (*dri_interface->createContextModes)( num_modes, sizeof( __GLcontextModes ) );
+   m = modes;
+   if ( ! driFillInModes( & m, fb_format, fb_type,
+			  depth_bits_array, stencil_bits_array, depth_buffer_factor,
+			  back_buffer_modes, back_buffer_factor,
+			  GLX_TRUE_COLOR ) ) {
+	fprintf( stderr, "[%s:%u] Error creating FBConfig!\n",
+		 __func__, __LINE__ );
+	return NULL;
+   }
+   if ( ! driFillInModes( & m, fb_format, fb_type,
+			  depth_bits_array, stencil_bits_array, depth_buffer_factor,
+			  back_buffer_modes, back_buffer_factor,
+			  GLX_DIRECT_COLOR ) ) {
+	fprintf( stderr, "[%s:%u] Error creating FBConfig!\n",
+		 __func__, __LINE__ );
+	return NULL;
+   }
+
+   /* Mark the visual as slow if there are "fake" stencil bits.
+    */
+   for ( m = modes ; m != NULL ; m = m->next ) {
+      if ( (m->stencilBits != 0) && (m->stencilBits != stencil_bits) ) {
+	 m->visualRating = GLX_SLOW_CONFIG;
+      }
+   }
+
+   return modes;
+}
+
+
+/**
+ * This is the bootstrap function for the driver.  libGL supplies all of the
+ * requisite information about the system, and the driver initializes itself.
+ * This routine also fills in the linked list pointed to by \c driver_modes
+ * with the \c __GLcontextModes that the driver can support for windows or
+ * pbuffers.
+ * 
+ * \return A pointer to a \c __DRIscreenPrivate on success, or \c NULL on 
+ *         failure.
+ */
+PUBLIC
+void * __driCreateNewScreen_20050727( __DRInativeDisplay *dpy, int scrn, __DRIscreen *psc,
+			     const __GLcontextModes * modes,
+			     const __DRIversion * ddx_version,
+			     const __DRIversion * dri_version,
+			     const __DRIversion * drm_version,
+			     const __DRIframebuffer * frame_buffer,
+			     drmAddress pSAREA, int fd, 
+			     int internal_api_version,
+			     const __DRIinterfaceMethods * interface,
+			     __GLcontextModes ** driver_modes )
+			     
+{
+   __DRIscreenPrivate *psp;
+   static const __DRIversion ddx_expected = { 1, 6, 0 };
+   static const __DRIversion dri_expected = { 4, 0, 0 };
+   static const __DRIversion drm_expected = { 1, 3, 0 };
+
+   dri_interface = interface;
+
+   if ( ! driCheckDriDdxDrmVersions2( "i915",
+				      dri_version, & dri_expected,
+				      ddx_version, & ddx_expected,
+				      drm_version, & drm_expected ) ) {
+      return NULL;
+   }
+
+   psp = __driUtilCreateNewScreen(dpy, scrn, psc, NULL,
+				  ddx_version, dri_version, drm_version,
+				  frame_buffer, pSAREA, fd,
+				  internal_api_version, &intelAPI);
+   if ( psp != NULL ) {
+      I830DRIPtr dri_priv = (I830DRIPtr) psp->pDevPriv;
+      *driver_modes = intelFillInModes( dri_priv->cpp * 8,
+					(dri_priv->cpp == 2) ? 16 : 24,
+					(dri_priv->cpp == 2) ? 0  : 8,
+					GL_TRUE );
+
+      /* Calling driInitExtensions here, with a NULL context pointer, does not actually
+       * enable the extensions.  It just makes sure that all the dispatch offsets for all
+       * the extensions that *might* be enables are known.  This is needed because the
+       * dispatch offsets need to be known when _mesa_context_create is called, but we can't
+       * enable the extensions until we have a context pointer.
+       *
+       * Hello chicken.  Hello egg.  How are you two today?
+       */
+      driInitExtensions( NULL, card_extensions, GL_FALSE );
+   }
+
+   return (void *) psp;
+}