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path: root/src/mesa/drivers/dri/intel/intel_context.c
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/**************************************************************************
 * 
 * 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 "main/glheader.h"
#include "main/context.h"
#include "main/matrix.h"
#include "main/simple_list.h"
#include "main/extensions.h"
#include "main/framebuffer.h"
#include "main/imports.h"
#include "main/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_chipset.h"
#include "intel_buffers.h"
#include "intel_tex.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 "intel_decode.h"
#include "intel_bufmgr.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_occlusion_query
#define need_GL_ARB_point_parameters
#define need_GL_ARB_shader_objects
#define need_GL_ARB_texture_compression
#define need_GL_ARB_vertex_buffer_object
#define need_GL_ARB_vertex_program
#define need_GL_ARB_vertex_shader
#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_point_parameters
#define need_GL_EXT_secondary_color
#define need_GL_ATI_separate_stencil
#define need_GL_NV_point_sprite
#define need_GL_NV_vertex_program
#define need_GL_VERSION_2_0
#define need_GL_VERSION_2_1

#include "extension_helper.h"

#define DRIVER_DATE                     "20090114"
#define DRIVER_DATE_GEM                 "GEM " DRIVER_DATE

static const GLubyte *
intelGetString(GLcontext * ctx, GLenum name)
{
   const struct intel_context *const intel = intel_context(ctx);
   const char *chipset;
   static char buffer[128];

   switch (name) {
   case GL_VENDOR:
      return (GLubyte *) "Tungsten Graphics, Inc";
      break;

   case GL_RENDERER:
      switch (intel->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_E7221_G:
	 chipset = "Intel (R) E7221G (i915)";
	 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;
      case PCI_CHIP_I965_Q:
	 chipset = "Intel(R) 965Q";
	 break;
      case PCI_CHIP_I965_G:
      case PCI_CHIP_I965_G_1:
	 chipset = "Intel(R) 965G";
	 break;
      case PCI_CHIP_I946_GZ:
	 chipset = "Intel(R) 946GZ";
	 break;
      case PCI_CHIP_I965_GM:
	 chipset = "Intel(R) 965GM";
	 break;
      case PCI_CHIP_I965_GME:
	 chipset = "Intel(R) 965GME/GLE";
	 break;
      case PCI_CHIP_GM45_GM:
	 chipset = "Mobile IntelĀ® GM45 Express Chipset";
	 break; 
      case PCI_CHIP_IGD_E_G:
	 chipset = "Intel(R) Integrated Graphics Device";
	 break;
      case PCI_CHIP_G45_G:
         chipset = "Intel(R) G45/G43";
         break;
      case PCI_CHIP_Q45_G:
         chipset = "Intel(R) Q45/Q43";
         break;
      case PCI_CHIP_G41_G:
         chipset = "Intel(R) G41";
         break;
      default:
         chipset = "Unknown Intel Chipset";
         break;
      }

      (void) driGetRendererString(buffer, chipset, 
				  (intel->ttm) ? DRIVER_DATE_GEM : DRIVER_DATE,
				  0);
      return (GLubyte *) buffer;

   default:
      return NULL;
   }
}

void
intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
{
   struct intel_framebuffer *intel_fb = drawable->driverPrivate;
   struct intel_renderbuffer *rb;
   struct intel_region *region, *depth_region;
   struct intel_context *intel = context->driverPrivate;
   __DRIbuffer *buffers;
   __DRIscreen *screen;
   int i, count;
   unsigned int attachments[10];
   uint32_t name;
   const char *region_name;

   if (INTEL_DEBUG & DEBUG_DRI)
      fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);

   screen = intel->intelScreen->driScrnPriv;

   i = 0;
   if (intel_fb->color_rb[0])
      attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
   if (intel_fb->color_rb[1])
      attachments[i++] = __DRI_BUFFER_BACK_LEFT;
   if (intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH))
      attachments[i++] = __DRI_BUFFER_DEPTH;
   if (intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL))
      attachments[i++] = __DRI_BUFFER_STENCIL;

   buffers = (*screen->dri2.loader->getBuffers)(drawable,
						&drawable->w,
						&drawable->h,
						attachments, i,
						&count,
						drawable->loaderPrivate);

   if (buffers == NULL)
      return;

   drawable->x = 0;
   drawable->y = 0;
   drawable->backX = 0;
   drawable->backY = 0;
   drawable->numClipRects = 1;
   drawable->pClipRects[0].x1 = 0;
   drawable->pClipRects[0].y1 = 0;
   drawable->pClipRects[0].x2 = drawable->w;
   drawable->pClipRects[0].y2 = drawable->h;
   drawable->numBackClipRects = 1;
   drawable->pBackClipRects[0].x1 = 0;
   drawable->pBackClipRects[0].y1 = 0;
   drawable->pBackClipRects[0].x2 = drawable->w;
   drawable->pBackClipRects[0].y2 = drawable->h;

   depth_region = NULL;
   for (i = 0; i < count; i++) {
       switch (buffers[i].attachment) {
       case __DRI_BUFFER_FRONT_LEFT:
	   rb = intel_fb->color_rb[0];
	   region_name = "dri2 front buffer";
	   break;

       case __DRI_BUFFER_BACK_LEFT:
	   rb = intel_fb->color_rb[1];
	   region_name = "dri2 back buffer";
	   break;

       case __DRI_BUFFER_DEPTH:
	   rb = intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH);
	   region_name = "dri2 depth buffer";
	   break;

       case __DRI_BUFFER_STENCIL:
	   rb = intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL);
	   region_name = "dri2 stencil buffer";
	   break;

       case __DRI_BUFFER_ACCUM:
       default:
	   fprintf(stderr,
		   "unhandled buffer attach event, attacment type %d\n",
		   buffers[i].attachment);
	   return;
       }

       if (rb->region) {
	  dri_bo_flink(rb->region->buffer, &name);
	  if (name == buffers[i].name)
	     continue;
       }

       if (INTEL_DEBUG & DEBUG_DRI)
	  fprintf(stderr,
		  "attaching buffer %d, at %d, cpp %d, pitch %d\n",
		  buffers[i].name, buffers[i].attachment,
		  buffers[i].cpp, buffers[i].pitch);
       
       if (buffers[i].attachment == __DRI_BUFFER_STENCIL && depth_region) {
	  if (INTEL_DEBUG & DEBUG_DRI)
	     fprintf(stderr, "(reusing depth buffer as stencil)\n");
	  intel_region_reference(&region, depth_region);
       }
       else
          region = intel_region_alloc_for_handle(intel, buffers[i].cpp,
						 drawable->w,
						 drawable->h,
						 buffers[i].pitch / buffers[i].cpp,
						 buffers[i].name,
						 region_name);

       if (buffers[i].attachment == __DRI_BUFFER_DEPTH)
	  depth_region = region;

       intel_renderbuffer_set_region(rb, region);
       intel_region_release(&region);
   }

   driUpdateFramebufferSize(&intel->ctx, drawable);
}

void
intel_viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
    struct intel_context *intel = intel_context(ctx);
    __DRIcontext *driContext = intel->driContext;
    void (*old_viewport)(GLcontext *ctx, GLint x, GLint y,
			 GLsizei w, GLsizei h);

    if (!driContext->driScreenPriv->dri2.enabled)
	return;

    intel_update_renderbuffers(driContext, driContext->driDrawablePriv);
    if (driContext->driDrawablePriv != driContext->driReadablePriv)
	intel_update_renderbuffers(driContext, driContext->driReadablePriv);

    old_viewport = ctx->Driver.Viewport;
    ctx->Driver.Viewport = NULL;
    intel->driDrawable = driContext->driDrawablePriv;
    intelWindowMoved(intel);
    intel_draw_buffer(ctx, intel->ctx.DrawBuffer);
    ctx->Driver.Viewport = old_viewport;
}

/**
 * Extension strings exported by the intel driver.
 *
 * Extensions supported by all chips supported by i830_dri, i915_dri, or
 * i965_dri.
 */
static 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_crossbar",       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_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_logic_op",             NULL },
   { "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_multi_draw_arrays",          GL_EXT_multi_draw_arrays_functions },
   { "GL_EXT_packed_depth_stencil",       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_point_sprite",                GL_NV_point_sprite_functions },
   { "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_extension brw_extensions[] = {
   { "GL_ARB_depth_texture",              NULL },
   { "GL_ARB_draw_buffers",               NULL },
   { "GL_ARB_fragment_program",           NULL },
   { "GL_ARB_fragment_program_shadow",    NULL },
   { "GL_ARB_fragment_shader",            NULL },
   { "GL_ARB_occlusion_query",            GL_ARB_occlusion_query_functions },
   { "GL_ARB_point_sprite", 		  NULL },
   { "GL_ARB_shader_objects",             GL_ARB_shader_objects_functions },
   { "GL_ARB_shading_language_100",       GL_VERSION_2_0_functions },
#if 0
   /* Support for GLSL 1.20 is currently broken in core Mesa.
    */
   { "GL_ARB_shading_language_120",       GL_VERSION_2_1_functions },
#endif
   { "GL_ARB_shadow",                     NULL },
   { "GL_ARB_texture_non_power_of_two",   NULL },
   { "GL_ARB_vertex_shader",              GL_ARB_vertex_shader_functions },
   { "GL_EXT_shadow_funcs",               NULL },
   { "GL_EXT_texture_sRGB",		  NULL },
   { "GL_ATI_separate_stencil",           GL_ATI_separate_stencil_functions },
   { "GL_ATI_texture_env_combine3",       NULL },
   { NULL,                                NULL }
};

static const struct dri_extension arb_oq_extensions[] = {
   { NULL, NULL }
};

static const struct dri_extension ttm_extensions[] = {
   { "GL_ARB_pixel_buffer_object",        NULL },
   { "GL_EXT_framebuffer_object",         GL_EXT_framebuffer_object_functions },
   { NULL, NULL }
};

/**
 * Initializes potential list of extensions if ctx == NULL, or actually enables
 * extensions for a context.
 */
void intelInitExtensions(GLcontext *ctx, GLboolean enable_imaging)
{
   struct intel_context *intel = ctx?intel_context(ctx):NULL;

   /* Disable imaging extension until convolution is working in teximage paths.
    */
   enable_imaging = GL_FALSE;

   driInitExtensions(ctx, card_extensions, enable_imaging);

   if (intel == NULL || intel->ttm)
      driInitExtensions(ctx, ttm_extensions, GL_FALSE);

   if (intel == NULL || IS_965(intel->intelScreen->deviceID))
      driInitExtensions(ctx, brw_extensions, GL_FALSE);
}

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},
   { "sync",  DEBUG_SYNC},
   { "prim",  DEBUG_PRIMS },
   { "vert",  DEBUG_VERTS },
   { "dri",   DEBUG_DRI },
   { "dma",   DEBUG_DMA },
   { "san",   DEBUG_SANITY },
   { "sleep", DEBUG_SLEEP },
   { "stats", DEBUG_STATS },
   { "tile",  DEBUG_TILE },
   { "sing",  DEBUG_SINGLE_THREAD },
   { "thre",  DEBUG_SINGLE_THREAD },
   { "wm",    DEBUG_WM },
   { "urb",   DEBUG_URB },
   { "vs",    DEBUG_VS },
   { NULL,    0 }
};


static void
intelInvalidateState(GLcontext * ctx, GLuint new_state)
{
    struct intel_context *intel = intel_context(ctx);

   _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);

   intel->NewGLState |= new_state;

   if (intel->vtbl.invalidate_state)
      intel->vtbl.invalidate_state( intel, new_state );
}


void
intelFlush(GLcontext * ctx)
{
   struct intel_context *intel = intel_context(ctx);

   if (intel->Fallback)
      _swrast_flush(ctx);

   if (!IS_965(intel->intelScreen->deviceID))
      INTEL_FIREVERTICES(intel);

   /* Emit a flush so that any frontbuffer rendering that might have occurred
    * lands onscreen in a timely manner, even if the X Server doesn't trigger
    * a flush for us.
    */
   intel_batchbuffer_emit_mi_flush(intel->batch);

   if (intel->batch->map != intel->batch->ptr)
      intel_batchbuffer_flush(intel->batch);
}

void
intelFinish(GLcontext * ctx)
{
   struct gl_framebuffer *fb = ctx->DrawBuffer;
   int i;

   intelFlush(ctx);

   for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
       struct intel_renderbuffer *irb;

       irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]);

       if (irb->region)
	  dri_bo_wait_rendering(irb->region->buffer);
   }
   if (fb->_DepthBuffer) {
      /* XXX: Wait on buffer idle */
   }
}

void
intelInitDriverFunctions(struct dd_function_table *functions)
{
   _mesa_init_driver_functions(functions);

   functions->Flush = intelFlush;
   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);
   intelInitStateFuncs(functions);
   intelInitBufferFuncs(functions);
   intelInitPixelFuncs(functions);
}


GLboolean
intelInitContext(struct intel_context *intel,
                 const __GLcontextModes * mesaVis,
                 __DRIcontextPrivate * driContextPriv,
                 void *sharedContextPrivate,
                 struct dd_function_table *functions)
{
   GLcontext *ctx = &intel->ctx;
   GLcontext *shareCtx = (GLcontext *) sharedContextPrivate;
   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
   int fthrottle_mode;

   if (!_mesa_initialize_context(&intel->ctx, mesaVis, shareCtx,
                                 functions, (void *) intel)) {
      _mesa_printf("%s: failed to init mesa context\n", __FUNCTION__);
      return GL_FALSE;
   }

   driContextPriv->driverPrivate = intel;
   intel->intelScreen = intelScreen;
   intel->driScreen = sPriv;
   intel->sarea = intelScreen->sarea;
   intel->driContext = driContextPriv;

   /* Dri stuff */
   intel->hHWContext = driContextPriv->hHWContext;
   intel->driFd = sPriv->fd;
   intel->driHwLock = sPriv->lock;

   driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
                       intel->driScreen->myNum,
		       IS_965(intelScreen->deviceID) ? "i965" : "i915");
   if (intelScreen->deviceID == PCI_CHIP_I865_G)
      intel->maxBatchSize = 4096;
   else
      intel->maxBatchSize = BATCH_SZ;

   intel->bufmgr = intelScreen->bufmgr;
   intel->ttm = intelScreen->ttm;
   if (intel->ttm) {
      int bo_reuse_mode;

      bo_reuse_mode = driQueryOptioni(&intel->optionCache, "bo_reuse");
      switch (bo_reuse_mode) {
      case DRI_CONF_BO_REUSE_DISABLED:
	 break;
      case DRI_CONF_BO_REUSE_ALL:
	 intel_bufmgr_gem_enable_reuse(intel->bufmgr);
	 break;
      }
   }

   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;
   }

   if (intel->strict_conformance) {
      ctx->Const.MinLineWidth = 1.0;
      ctx->Const.MinLineWidthAA = 1.0;
      ctx->Const.MaxLineWidth = 1.0;
      ctx->Const.MaxLineWidthAA = 1.0;
      ctx->Const.LineWidthGranularity = 1.0;
   }
   else {
      ctx->Const.MinLineWidth = 1.0;
      ctx->Const.MinLineWidthAA = 1.0;
      ctx->Const.MaxLineWidth = 5.0;
      ctx->Const.MaxLineWidthAA = 5.0;
      ctx->Const.LineWidthGranularity = 0.5;
   }

   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);

   intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
   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;
      break;
   case 24:
      intel->polygon_offset_scale = 2.0;     /* req'd to pass glean */
      break;
   default:
      assert(0);
      break;
   }

   if (IS_965(intelScreen->deviceID))
      intel->polygon_offset_scale /= 0xffff;

   intel->RenderIndex = ~0;

   fthrottle_mode = driQueryOptioni(&intel->optionCache, "fthrottle_mode");
   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);

   if (IS_965(intelScreen->deviceID) && !intel->intelScreen->irq_active) {
      _mesa_printf("IRQs not active.  Exiting\n");
      exit(1);
   }

   intelInitExtensions(ctx, GL_FALSE);

   INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
   if (INTEL_DEBUG & DEBUG_BUFMGR)
      dri_bufmgr_set_debug(intel->bufmgr, GL_TRUE);

   if (!sPriv->dri2.enabled)
      intel_recreate_static_regions(intel);

   intel->batch = intel_batchbuffer_alloc(intel);

   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;

   /* Force all software fallbacks */
   if (driQueryOptionb(&intel->optionCache, "no_rast")) {
      fprintf(stderr, "disabling 3D rasterization\n");
      intel->no_rast = 1;
   }

   /* Disable all hardware rendering (skip emitting batches and fences/waits
    * to the kernel)
    */
   intel->no_hw = getenv("INTEL_NO_HW") != NULL;

   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);
      intel->batch = NULL;

      free(intel->prim.vb);
      intel->prim.vb = NULL;
      dri_bo_unreference(intel->prim.vb_bo);
      intel->prim.vb_bo = 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");
      }

      intel_region_release(&intel->front_region);
      intel_region_release(&intel->back_region);
      intel_region_release(&intel->depth_region);

      driDestroyOptionCache(&intel->optionCache);

      /* free the Mesa context */
      _mesa_free_context_data(&intel->ctx);
   }
}

GLboolean
intelUnbindContext(__DRIcontextPrivate * driContextPriv)
{
   return GL_TRUE;
}

GLboolean
intelMakeCurrent(__DRIcontextPrivate * driContextPriv,
                 __DRIdrawablePrivate * driDrawPriv,
                 __DRIdrawablePrivate * driReadPriv)
{
   __DRIscreenPrivate *psp = driDrawPriv->driScreenPriv;

   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;
 
      if (driContextPriv->driScreenPriv->dri2.enabled) {     
          intel_update_renderbuffers(driContextPriv, driDrawPriv);
          if (driDrawPriv != driReadPriv)
              intel_update_renderbuffers(driContextPriv, driReadPriv);
      } else {
          /* XXX FBO temporary fix-ups! */
          /* if the renderbuffers don't have regions, init them from the context */
         struct intel_renderbuffer *irbDepth
            = intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH);
         struct intel_renderbuffer *irbStencil
            = intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL);

         if (intel_fb->color_rb[0]) {
	    intel_renderbuffer_set_region(intel_fb->color_rb[0],
					  intel->front_region);
         }
         if (intel_fb->color_rb[1]) {
	    intel_renderbuffer_set_region(intel_fb->color_rb[1],
					  intel->back_region);
         }

         if (irbDepth) {
	    intel_renderbuffer_set_region(irbDepth, intel->depth_region);
         }
         if (irbStencil) {
	    intel_renderbuffer_set_region(irbStencil, intel->depth_region);
         }
      }

      /* set 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->driReadDrawable != driReadPriv)
	    intel->driReadDrawable = driReadPriv;

	 if (intel->driDrawable != driDrawPriv) {
	    if (driDrawPriv->swap_interval == (unsigned)-1) {
	       int i;

	       driDrawPriv->vblFlags = (intel->intelScreen->irq_active != 0)
		  ? driGetDefaultVBlankFlags(&intel->optionCache)
		 : VBLANK_FLAG_NO_IRQ;

	       (*psp->systemTime->getUST) (&intel_fb->swap_ust);
	       driDrawableInitVBlank(driDrawPriv);
	       intel_fb->vbl_waited = driDrawPriv->vblSeq;

	       for (i = 0; i < 2; i++) {
		  if (intel_fb->color_rb[i])
		     intel_fb->color_rb[i]->vbl_pending = driDrawPriv->vblSeq;
	       }
	    }
	    intel->driDrawable = driDrawPriv;
	    intelWindowMoved(intel);
	 }

	 intel_draw_buffer(&intel->ctx, &intel_fb->Base);
      }
   }
   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;
   volatile drm_i915_sarea_t *sarea = intel->sarea;
   int me = intel->hHWContext;

   drmGetLock(intel->driFd, intel->hHWContext, flags);
   intel->locked = 1;

   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 && sarea->ctxOwner != me) {
      if (INTEL_DEBUG & DEBUG_BUFMGR) {
	 fprintf(stderr, "Lost Context: sarea->ctxOwner %x me %x\n",
		 sarea->ctxOwner, me);
      }
      sarea->ctxOwner = me;
   }

   /* If the last consumer of the texture memory wasn't us, notify the fake
    * bufmgr and record the new owner.  We should have the memory shared
    * between contexts of a single fake bufmgr, but this will at least make
    * things correct for now.
    */
   if (!intel->ttm && sarea->texAge != intel->hHWContext) {
      sarea->texAge = intel->hHWContext;
      intel_bufmgr_fake_contended_lock_take(intel->bufmgr);
      if (INTEL_DEBUG & DEBUG_BATCH)
	 intel_decode_context_reset();
      if (INTEL_DEBUG & DEBUG_BUFMGR)
	 fprintf(stderr, "Lost Textures: sarea->texAge %x hw context %x\n",
		 sarea->ctxOwner, intel->hHWContext);
   }

   /* Drawable changed?
    */
   if (dPriv && intel->lastStamp != dPriv->lastStamp) {
       intelWindowMoved(intel);
       intel->lastStamp = dPriv->lastStamp;
   }
}


_glthread_DECLARE_STATIC_MUTEX(lockMutex);

/* Lock the hardware and validate our state.  
 */
void LOCK_HARDWARE( struct intel_context *intel )
{
    __DRIdrawable *dPriv = intel->driDrawable;
    __DRIscreen *sPriv = intel->driScreen;
    char __ret = 0;
    struct intel_framebuffer *intel_fb = NULL;
    struct intel_renderbuffer *intel_rb = NULL;

    _glthread_LOCK_MUTEX(lockMutex);
    assert(!intel->locked);
    intel->locked = 1;

    if (intel->driDrawable) {
       intel_fb = intel->driDrawable->driverPrivate;

       if (intel_fb)
	  intel_rb =
	     intel_get_renderbuffer(&intel_fb->Base,
				    intel_fb->Base._ColorDrawBufferIndexes[0]);
    }

    if (intel_rb && dPriv->vblFlags &&
	!(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ) &&
	(intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
	drmVBlank vbl;

	vbl.request.type = DRM_VBLANK_ABSOLUTE;

	if ( dPriv->vblFlags & 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;
    }

    if (!sPriv->dri2.enabled) {
	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);
}


/* Unlock the hardware using the global current context 
 */
void UNLOCK_HARDWARE( struct intel_context *intel )
{
    __DRIscreen *sPriv = intel->driScreen;

   intel->vtbl.note_unlock( intel );
   intel->locked = 0;

   if (!sPriv->dri2.enabled)
      DRM_UNLOCK(intel->driFd, intel->driHwLock, intel->hHWContext);

   _glthread_UNLOCK_MUTEX(lockMutex);

   if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - unlocked\n", __progname);

   /**
    * Nothing should be left in batch outside of LOCK/UNLOCK which references
    * cliprects.
    */
   if (intel->batch->cliprect_mode == REFERENCES_CLIPRECTS)
      intel_batchbuffer_flush(intel->batch);
}