A version of the i915tex driver with all drawing code removed.

This is intended to support the softpipe development work.  More code
will be removed and pushed into softpipe until this basicially becomes
the DRI/GLX interface for that driver.

1 files changed, 768 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i915pipe/intel_context.c b/src/mesa/drivers/dri/i915pipe/intel_context.c
new file mode 100644
index 0000000000..e8e00b9606
--- /dev/null
+++ b/src/mesa/drivers/dri/i915pipe/intel_context.c
@@ -0,0 +1,768 @@
+/**************************************************************************
+ * 
+ * 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 "matrix.h"
+#include "simple_list.h"
+#include "extensions.h"
+#include "framebuffer.h"
+#include "imports.h"
+#include "points.h"
+
+#include "swrast/swrast.h"
+#include "swrast_setup/swrast_setup.h"
+#include "tnl/tnl.h"
+
+#include "tnl/t_pipeline.h"
+#include "tnl/t_vertex.h"
+
+#include "drivers/common/driverfuncs.h"
+
+#include "intel_screen.h"
+
+#include "i830_dri.h"
+
+#include "intel_buffers.h"
+#include "intel_tex.h"
+#include "intel_span.h"
+#include "intel_tris.h"
+#include "intel_ioctl.h"
+#include "intel_batchbuffer.h"
+#include "intel_blit.h"
+#include "intel_pixel.h"
+#include "intel_regions.h"
+#include "intel_buffer_objects.h"
+#include "intel_fbo.h"
+
+#include "pipe/softpipe/sp_context.h"
+#include "state_tracker/st_public.h"
+
+
+#include "drirenderbuffer.h"
+#include "vblank.h"
+#include "utils.h"
+#include "xmlpool.h"            /* for symbolic values of enum-type options */
+#ifndef INTEL_DEBUG
+int INTEL_DEBUG = (0);
+#endif
+
+#define need_GL_ARB_multisample
+#define need_GL_ARB_point_parameters
+#define need_GL_ARB_texture_compression
+#define need_GL_ARB_vertex_buffer_object
+#define need_GL_ARB_vertex_program
+#define need_GL_ARB_window_pos
+#define need_GL_EXT_blend_color
+#define need_GL_EXT_blend_equation_separate
+#define need_GL_EXT_blend_func_separate
+#define need_GL_EXT_blend_minmax
+#define need_GL_EXT_cull_vertex
+#define need_GL_EXT_fog_coord
+#define need_GL_EXT_framebuffer_object
+#define need_GL_EXT_multi_draw_arrays
+#define need_GL_EXT_secondary_color
+#define need_GL_NV_vertex_program
+#include "extension_helper.h"
+
+
+#define DRIVER_DATE                     "20061102"
+
+_glthread_Mutex lockMutex;
+static GLboolean lockMutexInit = GL_FALSE;
+
+
+static const GLubyte *
+intelGetString(GLcontext * ctx, GLenum name)
+{
+   const char *chipset;
+   static char buffer[128];
+
+   switch (name) {
+   case GL_VENDOR:
+      return (GLubyte *) "Tungsten Graphics, Inc";
+      break;
+
+   case GL_RENDERER:
+      switch (intel_context(ctx)->intelScreen->deviceID) {
+      case PCI_CHIP_845_G:
+         chipset = "Intel(R) 845G";
+         break;
+      case PCI_CHIP_I830_M:
+         chipset = "Intel(R) 830M";
+         break;
+      case PCI_CHIP_I855_GM:
+         chipset = "Intel(R) 852GM/855GM";
+         break;
+      case PCI_CHIP_I865_G:
+         chipset = "Intel(R) 865G";
+         break;
+      case PCI_CHIP_I915_G:
+         chipset = "Intel(R) 915G";
+         break;
+      case PCI_CHIP_I915_GM:
+         chipset = "Intel(R) 915GM";
+         break;
+      case PCI_CHIP_I945_G:
+         chipset = "Intel(R) 945G";
+         break;
+      case PCI_CHIP_I945_GM:
+         chipset = "Intel(R) 945GM";
+         break;
+      case PCI_CHIP_I945_GME:
+         chipset = "Intel(R) 945GME";
+         break;
+      case PCI_CHIP_G33_G:
+	 chipset = "Intel(R) G33";
+	 break;
+      case PCI_CHIP_Q35_G:
+	 chipset = "Intel(R) Q35";
+	 break;
+      case PCI_CHIP_Q33_G:
+	 chipset = "Intel(R) Q33";
+	 break;
+      default:
+         chipset = "Unknown Intel Chipset";
+         break;
+      }
+
+      (void) driGetRendererString(buffer, chipset, DRIVER_DATE, 0);
+      return (GLubyte *) buffer;
+
+   default:
+      return NULL;
+   }
+}
+
+
+/**
+ * Extension strings exported by the intel driver.
+ *
+ * \note
+ * It appears that ARB_texture_env_crossbar has "disappeared" compared to the
+ * old i830-specific driver.
+ */
+const struct dri_extension card_extensions[] = {
+   {"GL_ARB_multisample", GL_ARB_multisample_functions},
+   {"GL_ARB_multitexture", NULL},
+   {"GL_ARB_point_parameters", GL_ARB_point_parameters_functions},
+   {"GL_ARB_texture_border_clamp", NULL},
+   {"GL_ARB_texture_compression", GL_ARB_texture_compression_functions},
+   {"GL_ARB_texture_cube_map", NULL},
+   {"GL_ARB_texture_env_add", NULL},
+   {"GL_ARB_texture_env_combine", NULL},
+   {"GL_ARB_texture_env_dot3", NULL},
+   {"GL_ARB_texture_mirrored_repeat", NULL},
+   {"GL_ARB_texture_rectangle", NULL},
+   {"GL_ARB_vertex_buffer_object", GL_ARB_vertex_buffer_object_functions},
+   {"GL_ARB_pixel_buffer_object", NULL},
+   {"GL_ARB_vertex_program", GL_ARB_vertex_program_functions},
+   {"GL_ARB_window_pos", GL_ARB_window_pos_functions},
+   {"GL_EXT_blend_color", GL_EXT_blend_color_functions},
+   {"GL_EXT_blend_equation_separate",
+    GL_EXT_blend_equation_separate_functions},
+   {"GL_EXT_blend_func_separate", GL_EXT_blend_func_separate_functions},
+   {"GL_EXT_blend_minmax", GL_EXT_blend_minmax_functions},
+   {"GL_EXT_blend_subtract", NULL},
+   {"GL_EXT_cull_vertex", GL_EXT_cull_vertex_functions},
+   {"GL_EXT_fog_coord", GL_EXT_fog_coord_functions},
+   {"GL_EXT_framebuffer_object", GL_EXT_framebuffer_object_functions},
+   {"GL_EXT_multi_draw_arrays", GL_EXT_multi_draw_arrays_functions},
+#if 1                           /* XXX FBO temporary? */
+   {"GL_EXT_packed_depth_stencil", NULL},
+#endif
+   {"GL_EXT_pixel_buffer_object", NULL},
+   {"GL_EXT_secondary_color", GL_EXT_secondary_color_functions},
+   {"GL_EXT_stencil_wrap", NULL},
+   {"GL_EXT_texture_edge_clamp", NULL},
+   {"GL_EXT_texture_env_combine", NULL},
+   {"GL_EXT_texture_env_dot3", NULL},
+   {"GL_EXT_texture_filter_anisotropic", NULL},
+   {"GL_EXT_texture_lod_bias", NULL},
+   {"GL_3DFX_texture_compression_FXT1", NULL},
+   {"GL_APPLE_client_storage", NULL},
+   {"GL_MESA_pack_invert", NULL},
+   {"GL_MESA_ycbcr_texture", NULL},
+   {"GL_NV_blend_square", NULL},
+   {"GL_NV_vertex_program", GL_NV_vertex_program_functions},
+   {"GL_NV_vertex_program1_1", NULL},
+/*     { "GL_SGIS_generate_mipmap",           NULL }, */
+   {NULL, NULL}
+};
+
+
+
+
+static const struct dri_debug_control debug_control[] = {
+   {"tex", DEBUG_TEXTURE},
+   {"state", DEBUG_STATE},
+   {"ioctl", DEBUG_IOCTL},
+   {"blit", DEBUG_BLIT},
+   {"mip", DEBUG_MIPTREE},
+   {"fall", DEBUG_FALLBACKS},
+   {"verb", DEBUG_VERBOSE},
+   {"bat", DEBUG_BATCH},
+   {"pix", DEBUG_PIXEL},
+   {"buf", DEBUG_BUFMGR},
+   {"reg", DEBUG_REGION},
+   {"fbo", DEBUG_FBO},
+   {"lock", DEBUG_LOCK},
+   {NULL, 0}
+};
+
+
+static void
+intelInvalidateState(GLcontext * ctx, GLuint new_state)
+{
+   _swrast_InvalidateState(ctx, new_state);
+   _swsetup_InvalidateState(ctx, new_state);
+   _vbo_InvalidateState(ctx, new_state);
+   _tnl_InvalidateState(ctx, new_state);
+   _tnl_invalidate_vertex_state(ctx, new_state);
+
+   st_invalidate_state( ctx, new_state );
+
+   intel_context(ctx)->NewGLState |= new_state;
+}
+
+
+void
+intelFlush(GLcontext * ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+
+   if (intel->Fallback)
+      _swrast_flush(ctx);
+
+   INTEL_FIREVERTICES(intel);
+
+   if (intel->batch->map != intel->batch->ptr)
+      intel_batchbuffer_flush(intel->batch);
+
+   /* XXX: Need to do an MI_FLUSH here.
+    */
+}
+
+
+/**
+ * Check if we need to rotate/warp the front color buffer to the
+ * rotated screen.  We generally need to do this when we get a glFlush
+ * or glFinish after drawing to the front color buffer.
+ * If no rotation, just copy the private fake front buffer to the real one.
+ */
+static void
+intelCheckFrontUpdate(GLcontext * ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+   /* rely on _ColorDrawBufferMask being kept up to date by mesa
+      even for window-fbos. */
+   /* not sure. Might need that for all masks including
+      BUFFER_BIT_FRONT_LEFT maybe? */
+   if (intel->ctx.DrawBuffer->_ColorDrawBufferMask[0] ==
+       BUFFER_BIT_FRONT_LEFT) {
+      __DRIdrawablePrivate *dPriv = intel->driDrawable;
+      intelCopyBuffer(dPriv, NULL);
+   }
+}
+
+
+/**
+ * Called via glFlush.
+ */
+static void
+intelglFlush(GLcontext * ctx)
+{
+   intelFlush(ctx);
+   intelCheckFrontUpdate(ctx);
+}
+
+void
+intelFinish(GLcontext * ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+   intelFlush(ctx);
+   if (intel->batch->last_fence) {
+      driFenceFinish(intel->batch->last_fence,
+                     0, GL_FALSE);
+      driFenceUnReference(intel->batch->last_fence);
+      intel->batch->last_fence = NULL;
+   }
+   intelCheckFrontUpdate(ctx);
+}
+
+
+void
+intelInitDriverFunctions(struct dd_function_table *functions)
+{
+   _mesa_init_driver_functions(functions);
+
+   functions->Flush = intelglFlush;
+   functions->Finish = intelFinish;
+   functions->GetString = intelGetString;
+   functions->UpdateState = intelInvalidateState;
+   functions->CopyColorTable = _swrast_CopyColorTable;
+   functions->CopyColorSubTable = _swrast_CopyColorSubTable;
+   functions->CopyConvolutionFilter1D = _swrast_CopyConvolutionFilter1D;
+   functions->CopyConvolutionFilter2D = _swrast_CopyConvolutionFilter2D;
+
+   intelInitTextureFuncs(functions);
+   intelInitPixelFuncs(functions);
+   intelInitStateFuncs(functions);
+   intelInitBufferFuncs(functions);
+}
+
+
+
+GLboolean
+intelCreateContext(const __GLcontextModes * mesaVis,
+                   __DRIcontextPrivate * driContextPriv,
+                   void *sharedContextPrivate)
+{
+   struct dd_function_table functions;
+   
+   struct intel_context *intel = CALLOC_STRUCT(intel_context);
+   GLcontext *ctx = &intel->ctx;
+
+   GLcontext *shareCtx = (GLcontext *) sharedContextPrivate;
+   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
+   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
+   drmI830Sarea *saPriv = (drmI830Sarea *)
+      (((GLubyte *) sPriv->pSAREA) + intelScreen->sarea_priv_offset);
+   int fthrottle_mode;
+   GLboolean havePools;
+
+   DRM_LIGHT_LOCK(sPriv->fd, &sPriv->pSAREA->lock, driContextPriv->hHWContext);
+   havePools = intelCreatePools(intelScreen);
+   DRM_UNLOCK(sPriv->fd, &sPriv->pSAREA->lock, driContextPriv->hHWContext);
+
+   if (!havePools)
+      return GL_FALSE;
+
+   intelInitDriverFunctions(&functions);
+
+   if (!_mesa_initialize_context(&intel->ctx,
+                                 mesaVis, shareCtx,
+                                 &functions, (void *) intel))
+      return GL_FALSE;
+
+   driContextPriv->driverPrivate = intel;
+   intel->intelScreen = intelScreen;
+   intel->driScreen = sPriv;
+   intel->sarea = saPriv;
+
+   if (!lockMutexInit) {
+      lockMutexInit = GL_TRUE;
+      _glthread_INIT_MUTEX(lockMutex);
+   }
+
+   driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
+                       intel->driScreen->myNum, "i915");
+
+   ctx->Const.MaxTextureMaxAnisotropy = 2.0;
+
+   /* This doesn't yet catch all non-conformant rendering, but it's a
+    * start.
+    */
+   if (getenv("INTEL_STRICT_CONFORMANCE")) {
+      intel->strict_conformance = 1;
+   }
+
+   ctx->Const.MinLineWidth = 1.0;
+   ctx->Const.MinLineWidthAA = 1.0;
+   ctx->Const.MaxLineWidth = 3.0;
+   ctx->Const.MaxLineWidthAA = 3.0;
+   ctx->Const.LineWidthGranularity = 1.0;
+
+   ctx->Const.MinPointSize = 1.0;
+   ctx->Const.MinPointSizeAA = 1.0;
+   ctx->Const.MaxPointSize = 255.0;
+   ctx->Const.MaxPointSizeAA = 3.0;
+   ctx->Const.PointSizeGranularity = 1.0;
+
+   /* reinitialize the context point state.
+    * It depend on constants in __GLcontextRec::Const
+    */
+   _mesa_init_point(ctx);
+
+   ctx->Const.MaxColorAttachments = 4;  /* XXX FBO: review this */
+
+   /* Initialize the software rasterizer and helper modules. */
+   _swrast_CreateContext(ctx);
+   _vbo_CreateContext(ctx);
+   _tnl_CreateContext(ctx);
+   _swsetup_CreateContext(ctx);
+
+
+   /* Configure swrast to match hardware characteristics: */
+   _swrast_allow_pixel_fog(ctx, GL_FALSE);
+   _swrast_allow_vertex_fog(ctx, GL_TRUE);
+
+   /* Dri stuff */
+   intel->hHWContext = driContextPriv->hHWContext;
+   intel->driFd = sPriv->fd;
+   intel->driHwLock = (drmLock *) & sPriv->pSAREA->lock;
+
+   intel->hw_stipple = 1;
+
+   /* XXX FBO: this doesn't seem to be used anywhere */
+   switch (mesaVis->depthBits) {
+   case 0:                     /* what to do in this case? */
+   case 16:
+      intel->polygon_offset_scale = 1.0 / 0xffff;
+      break;
+   case 24:
+      intel->polygon_offset_scale = 2.0 / 0xffffff;     /* req'd to pass glean */
+      break;
+   default:
+      assert(0);
+      break;
+   }
+
+   /* Initialize swrast, tnl driver tables: */
+   intelInitSpanFuncs(ctx);
+
+   TNL_CONTEXT(ctx)->Driver.RunPipeline = _tnl_run_pipeline;
+
+
+   intel->RenderIndex = ~0;
+
+   fthrottle_mode = driQueryOptioni(&intel->optionCache, "fthrottle_mode");
+   intel->iw.irq_seq = -1;
+   intel->irqsEmitted = 0;
+
+   intel->do_irqs = (intel->intelScreen->irq_active &&
+                     fthrottle_mode == DRI_CONF_FTHROTTLE_IRQS);
+
+   intel->do_usleeps = (fthrottle_mode == DRI_CONF_FTHROTTLE_USLEEPS);
+
+   _math_matrix_ctr(&intel->ViewportMatrix);
+
+   /* Disable imaging extension until convolution is working in
+    * teximage paths:
+    */
+   driInitExtensions(ctx, card_extensions,
+/* 		      GL_TRUE, */
+                     GL_FALSE);
+
+
+   intel->batch = intel_batchbuffer_alloc(intel);
+   intel->last_swap_fence = NULL;
+   intel->first_swap_fence = NULL;
+
+   intel_bufferobj_init(intel);
+   intel_fbo_init(intel);
+
+   if (intel->ctx.Mesa_DXTn) {
+      _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
+      _mesa_enable_extension(ctx, "GL_S3_s3tc");
+   }
+   else if (driQueryOptionb(&intel->optionCache, "force_s3tc_enable")) {
+      _mesa_enable_extension(ctx, "GL_EXT_texture_compression_s3tc");
+   }
+
+   intel->prim.primitive = ~0;
+
+
+#if DO_DEBUG
+   INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
+#endif
+
+   if (getenv("INTEL_NO_RAST")) {
+      fprintf(stderr, "disabling 3D rasterization\n");
+      FALLBACK(intel, INTEL_FALLBACK_USER, 1);
+   }
+
+
+   st_create_context( &intel->ctx,
+		      softpipe_create() );
+   
+
+   return GL_TRUE;
+}
+
+void
+intelDestroyContext(__DRIcontextPrivate * driContextPriv)
+{
+   struct intel_context *intel =
+      (struct intel_context *) driContextPriv->driverPrivate;
+
+   assert(intel);               /* should never be null */
+   if (intel) {
+      GLboolean release_texture_heaps;
+
+      INTEL_FIREVERTICES(intel);
+
+      //intel->vtbl.destroy(intel);
+
+      release_texture_heaps = (intel->ctx.Shared->RefCount == 1);
+      _swsetup_DestroyContext(&intel->ctx);
+      _tnl_DestroyContext(&intel->ctx);
+      _vbo_DestroyContext(&intel->ctx);
+
+      _swrast_DestroyContext(&intel->ctx);
+      intel->Fallback = 0;      /* don't call _swrast_Flush later */
+
+      intel_batchbuffer_free(intel->batch);
+
+      if (intel->last_swap_fence) {
+	 driFenceFinish(intel->last_swap_fence, DRM_FENCE_TYPE_EXE, GL_TRUE);
+	 driFenceUnReference(intel->last_swap_fence);
+	 intel->last_swap_fence = NULL;
+      }
+      if (intel->first_swap_fence) {
+	 driFenceFinish(intel->first_swap_fence, DRM_FENCE_TYPE_EXE, GL_TRUE);
+	 driFenceUnReference(intel->first_swap_fence);
+	 intel->first_swap_fence = NULL;
+      }
+
+
+      if (release_texture_heaps) {
+         /* This share group is about to go away, free our private
+          * texture object data.
+          */
+         if (INTEL_DEBUG & DEBUG_TEXTURE)
+            fprintf(stderr, "do something to free texture heaps\n");
+      }
+
+      /* free the Mesa context */
+      _mesa_free_context_data(&intel->ctx);
+   }
+}
+
+GLboolean
+intelUnbindContext(__DRIcontextPrivate * driContextPriv)
+{
+   struct intel_context *intel = (struct intel_context *) driContextPriv->driverPrivate;
+   /* XXX UnbindContext is called AFTER the new context is made current.
+      Hopefully shouldn't be a problem ? */
+   FLUSH_VERTICES((&intel->ctx), 0);
+   intelFlush(&intel->ctx);
+   return GL_TRUE;
+}
+
+GLboolean
+intelMakeCurrent(__DRIcontextPrivate * driContextPriv,
+                 __DRIdrawablePrivate * driDrawPriv,
+                 __DRIdrawablePrivate * driReadPriv)
+{
+
+#if 0
+   if (driDrawPriv) {
+      fprintf(stderr, "x %d, y %d, width %d, height %d\n",
+	      driDrawPriv->x, driDrawPriv->y, driDrawPriv->w, driDrawPriv->h);
+   }
+#endif
+
+   if (driContextPriv) {
+      struct intel_context *intel =
+         (struct intel_context *) driContextPriv->driverPrivate;
+      struct intel_framebuffer *intel_fb =
+	 (struct intel_framebuffer *) driDrawPriv->driverPrivate;
+      GLframebuffer *readFb = (GLframebuffer *) driReadPriv->driverPrivate;
+
+      /* this is a hack so we have a valid context when the region allocation
+         is done. Need a per-screen context? */
+      intel->intelScreen->dummyctxptr = intel;
+
+      /* update GLframebuffer size to match window if needed */
+      driUpdateFramebufferSize(&intel->ctx, driDrawPriv);
+
+      if (driReadPriv != driDrawPriv) {
+         driUpdateFramebufferSize(&intel->ctx, driReadPriv);
+      }
+
+      _mesa_make_current(&intel->ctx, &intel_fb->Base, readFb);
+
+      /* The drawbuffer won't always be updated by _mesa_make_current: 
+       */
+      if (intel->ctx.DrawBuffer == &intel_fb->Base) {
+
+	 if (intel->driDrawable != driDrawPriv) {
+	    if (driDrawPriv->pdraw->swap_interval == (unsigned)-1) {
+	       int i;
+
+	       intel_fb->vblank_flags = (intel->intelScreen->irq_active != 0)
+		  ? driGetDefaultVBlankFlags(&intel->optionCache)
+		 : VBLANK_FLAG_NO_IRQ;
+
+	       (*dri_interface->getUST) (&intel_fb->swap_ust);
+	       driDrawableInitVBlank(driDrawPriv, intel_fb->vblank_flags,
+				     &intel_fb->vbl_seq);
+	       intel_fb->vbl_waited = intel_fb->vbl_seq;
+
+	       for (i = 0; i < 2; i++) {
+		  if (intel_fb->color_rb[i])
+		     intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_seq;
+	       }
+	    }
+	 }
+      }
+
+      if ((intel->driDrawable != driDrawPriv) ||
+	  (intel->lastStamp != driDrawPriv->lastStamp)) {
+	    intel->driDrawable = driDrawPriv;
+	    intelWindowMoved(intel);
+	    intel->lastStamp = driDrawPriv->lastStamp;
+      }
+
+   }
+   else {
+      _mesa_make_current(NULL, NULL, NULL);
+   }
+
+   return GL_TRUE;
+}
+
+static void
+intelContendedLock(struct intel_context *intel, GLuint flags)
+{
+   __DRIdrawablePrivate *dPriv = intel->driDrawable;
+   __DRIscreenPrivate *sPriv = intel->driScreen;
+   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
+   drmI830Sarea *sarea = intel->sarea;
+
+   drmGetLock(intel->driFd, intel->hHWContext, flags);
+
+   if (INTEL_DEBUG & DEBUG_LOCK)
+      _mesa_printf("%s - got contended lock\n", __progname);
+
+   /* If the window moved, may need to set a new cliprect now.
+    *
+    * NOTE: This releases and regains the hw lock, so all state
+    * checking must be done *after* this call:
+    */
+   if (dPriv)
+      DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);
+
+   if (sarea->width != intelScreen->width ||
+       sarea->height != intelScreen->height) {
+
+      intelUpdateScreenRotation(sPriv, sarea);
+   }
+
+#if 0
+   if (sarea->width != intel->width ||
+       sarea->height != intel->height ||
+       sarea->rotation != intel->current_rotation) {
+      int numClipRects = intel->numClipRects;
+
+      /*
+       * FIXME: Really only need to do this when drawing to a
+       * common back- or front buffer.
+       */
+
+      /*
+       * This will essentially drop the outstanding batchbuffer on the floor.
+       */
+      intel->numClipRects = 0;
+
+      if (intel->Fallback)
+	 _swrast_flush(&intel->ctx);
+
+      INTEL_FIREVERTICES(intel);
+
+      if (intel->batch->map != intel->batch->ptr)
+	 intel_batchbuffer_flush(intel->batch);
+
+      intel->numClipRects = numClipRects;
+
+      /* force window update */
+      intel->lastStamp = 0;
+
+      intel->width = sarea->width;
+      intel->height = sarea->height;
+      intel->current_rotation = sarea->rotation;
+   }
+#endif
+}
+
+
+/* Lock the hardware and validate our state.
+ */
+void LOCK_HARDWARE( struct intel_context *intel )
+{
+    char __ret=0;
+    struct intel_framebuffer *intel_fb = NULL;
+    struct intel_renderbuffer *intel_rb = NULL;
+    _glthread_LOCK_MUTEX(lockMutex);
+    assert(!intel->locked);
+
+    if (intel->driDrawable) {
+       intel_fb = intel->driDrawable->driverPrivate;
+
+       if (intel_fb)
+	  intel_rb =
+	     intel_get_renderbuffer(&intel_fb->Base,
+				    intel_fb->Base._ColorDrawBufferMask[0] ==
+				    BUFFER_BIT_FRONT_LEFT ? BUFFER_FRONT_LEFT :
+				    BUFFER_BACK_LEFT);
+    }
+
+    if (intel_rb && intel_fb->vblank_flags &&
+	!(intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ) &&
+	(intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
+	drmVBlank vbl;
+
+	vbl.request.type = DRM_VBLANK_ABSOLUTE;
+
+	if ( intel_fb->vblank_flags & VBLANK_FLAG_SECONDARY ) {
+	    vbl.request.type |= DRM_VBLANK_SECONDARY;
+	}
+
+	vbl.request.sequence = intel_rb->vbl_pending;
+	drmWaitVBlank(intel->driFd, &vbl);
+	intel_fb->vbl_waited = vbl.reply.sequence;
+    }
+
+    DRM_CAS(intel->driHwLock, intel->hHWContext,
+        (DRM_LOCK_HELD|intel->hHWContext), __ret);
+
+    if (__ret)
+        intelContendedLock( intel, 0 );
+
+    if (INTEL_DEBUG & DEBUG_LOCK)
+      _mesa_printf("%s - locked\n", __progname);
+
+    intel->locked = 1;
+}
+
+
+  /* Unlock the hardware using the global current context 
+   */
+void UNLOCK_HARDWARE( struct intel_context *intel )
+{
+   intel->locked = 0;
+
+   DRM_UNLOCK(intel->driFd, intel->driHwLock, intel->hHWContext);
+
+   _glthread_UNLOCK_MUTEX(lockMutex);
+
+   if (INTEL_DEBUG & DEBUG_LOCK)
+      _mesa_printf("%s - unlocked\n", __progname);
+} 
+