i915: Fork the shared code from i965.

Of this 15000 lines of code in intel/, we've identified 4000 lines that
are trivially unnecessary for i915, and another 1000 that are pointless for
i965, and expect to find more as time goes on.  Split the i915 driver off,
so that we can continue active development on i965 without worrying about
breaking i915.

Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Chad Versace <chad.versace@linux.intel.com>
Acked-by: Adam Jackson <ajax@redhat.com>
(and I hear second hand that idr is OK with it, too)

1 files changed, 1010 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i915/intel_context.c b/src/mesa/drivers/dri/i915/intel_context.c
index 27a1cbb255e..23d8281b4ca 120000..100644
--- a/src/mesa/drivers/dri/i915/intel_context.c
+++ b/src/mesa/drivers/dri/i915/intel_context.c
@@ -1 +1,1010 @@
-../intel/intel_context.c
\ No newline at end of file
+/**************************************************************************
+ * 
+ * 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/extensions.h"
+#include "main/fbobject.h"
+#include "main/framebuffer.h"
+#include "main/imports.h"
+#include "main/points.h"
+#include "main/renderbuffer.h"
+
+#include "swrast/swrast.h"
+#include "swrast_setup/swrast_setup.h"
+#include "tnl/tnl.h"
+#include "drivers/common/driverfuncs.h"
+#include "drivers/common/meta.h"
+
+#include "intel_chipset.h"
+#include "intel_buffers.h"
+#include "intel_tex.h"
+#include "intel_batchbuffer.h"
+#include "intel_clear.h"
+#include "intel_extensions.h"
+#include "intel_pixel.h"
+#include "intel_regions.h"
+#include "intel_buffer_objects.h"
+#include "intel_fbo.h"
+#include "intel_bufmgr.h"
+#include "intel_screen.h"
+#include "intel_mipmap_tree.h"
+
+#include "utils.h"
+#include "../glsl/ralloc.h"
+
+#ifndef INTEL_DEBUG
+int INTEL_DEBUG = (0);
+#endif
+
+
+static const GLubyte *
+intelGetString(struct gl_context * 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 *) "Intel Open Source Technology Center";
+      break;
+
+   case GL_RENDERER:
+      switch (intel->intelScreen->deviceID) {
+#undef CHIPSET
+#define CHIPSET(id, symbol, str) case id: chipset = str; break;
+#include "pci_ids/i915_pci_ids.h"
+#include "pci_ids/i965_pci_ids.h"
+      default:
+         chipset = "Unknown Intel Chipset";
+         break;
+      }
+
+      (void) driGetRendererString(buffer, chipset, 0);
+      return (GLubyte *) buffer;
+
+   default:
+      return NULL;
+   }
+}
+
+void
+intel_resolve_for_dri2_flush(struct intel_context *intel,
+                             __DRIdrawable *drawable)
+{
+   if (intel->gen < 6) {
+      /* MSAA and fast color clear are not supported, so don't waste time
+       * checking whether a resolve is needed.
+       */
+      return;
+   }
+
+   struct gl_framebuffer *fb = drawable->driverPrivate;
+   struct intel_renderbuffer *rb;
+
+   /* Usually, only the back buffer will need to be downsampled. However,
+    * the front buffer will also need it if the user has rendered into it.
+    */
+   static const gl_buffer_index buffers[2] = {
+         BUFFER_BACK_LEFT,
+         BUFFER_FRONT_LEFT,
+   };
+
+   for (int i = 0; i < 2; ++i) {
+      rb = intel_get_renderbuffer(fb, buffers[i]);
+      if (rb == NULL || rb->mt == NULL)
+         continue;
+      if (rb->mt->num_samples <= 1)
+         intel_miptree_resolve_color(intel, rb->mt);
+      else
+         intel_miptree_downsample(intel, rb->mt);
+   }
+}
+
+static void
+intel_flush_front(struct gl_context *ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+    __DRIcontext *driContext = intel->driContext;
+    __DRIdrawable *driDrawable = driContext->driDrawablePriv;
+    __DRIscreen *const screen = intel->intelScreen->driScrnPriv;
+
+    if (intel->front_buffer_dirty && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
+      if (screen->dri2.loader->flushFrontBuffer != NULL &&
+          driDrawable &&
+          driDrawable->loaderPrivate) {
+
+         /* Resolve before flushing FAKE_FRONT_LEFT to FRONT_LEFT.
+          *
+          * This potentially resolves both front and back buffer. It
+          * is unnecessary to resolve the back, but harms nothing except
+          * performance. And no one cares about front-buffer render
+          * performance.
+          */
+         intel_resolve_for_dri2_flush(intel, driDrawable);
+
+         screen->dri2.loader->flushFrontBuffer(driDrawable,
+                                               driDrawable->loaderPrivate);
+
+	 /* We set the dirty bit in intel_prepare_render() if we're
+	  * front buffer rendering once we get there.
+	  */
+	 intel->front_buffer_dirty = false;
+      }
+   }
+}
+
+static unsigned
+intel_bits_per_pixel(const struct intel_renderbuffer *rb)
+{
+   return _mesa_get_format_bytes(intel_rb_format(rb)) * 8;
+}
+
+static void
+intel_query_dri2_buffers(struct intel_context *intel,
+			 __DRIdrawable *drawable,
+			 __DRIbuffer **buffers,
+			 int *count);
+
+static void
+intel_process_dri2_buffer(struct intel_context *intel,
+			  __DRIdrawable *drawable,
+			  __DRIbuffer *buffer,
+			  struct intel_renderbuffer *rb,
+			  const char *buffer_name);
+
+void
+intel_update_renderbuffers(__DRIcontext *context, __DRIdrawable *drawable)
+{
+   struct gl_framebuffer *fb = drawable->driverPrivate;
+   struct intel_renderbuffer *rb;
+   struct intel_context *intel = context->driverPrivate;
+   __DRIbuffer *buffers = NULL;
+   int i, count;
+   const char *region_name;
+
+   /* Set this up front, so that in case our buffers get invalidated
+    * while we're getting new buffers, we don't clobber the stamp and
+    * thus ignore the invalidate. */
+   drawable->lastStamp = drawable->dri2.stamp;
+
+   if (unlikely(INTEL_DEBUG & DEBUG_DRI))
+      fprintf(stderr, "enter %s, drawable %p\n", __func__, drawable);
+
+   intel_query_dri2_buffers(intel, drawable, &buffers, &count);
+
+   if (buffers == NULL)
+      return;
+
+   for (i = 0; i < count; i++) {
+       switch (buffers[i].attachment) {
+       case __DRI_BUFFER_FRONT_LEFT:
+	   rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
+	   region_name = "dri2 front buffer";
+	   break;
+
+       case __DRI_BUFFER_FAKE_FRONT_LEFT:
+	   rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
+	   region_name = "dri2 fake front buffer";
+	   break;
+
+       case __DRI_BUFFER_BACK_LEFT:
+	   rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
+	   region_name = "dri2 back buffer";
+	   break;
+
+       case __DRI_BUFFER_DEPTH:
+       case __DRI_BUFFER_HIZ:
+       case __DRI_BUFFER_DEPTH_STENCIL:
+       case __DRI_BUFFER_STENCIL:
+       case __DRI_BUFFER_ACCUM:
+       default:
+	   fprintf(stderr,
+		   "unhandled buffer attach event, attachment type %d\n",
+		   buffers[i].attachment);
+	   return;
+       }
+
+       intel_process_dri2_buffer(intel, drawable, &buffers[i], rb, region_name);
+   }
+
+   driUpdateFramebufferSize(&intel->ctx, drawable);
+}
+
+/**
+ * intel_prepare_render should be called anywhere that curent read/drawbuffer
+ * state is required.
+ */
+void
+intel_prepare_render(struct intel_context *intel)
+{
+   __DRIcontext *driContext = intel->driContext;
+   __DRIdrawable *drawable;
+
+   drawable = driContext->driDrawablePriv;
+   if (drawable && drawable->dri2.stamp != driContext->dri2.draw_stamp) {
+      if (drawable->lastStamp != drawable->dri2.stamp)
+	 intel_update_renderbuffers(driContext, drawable);
+      intel_draw_buffer(&intel->ctx);
+      driContext->dri2.draw_stamp = drawable->dri2.stamp;
+   }
+
+   drawable = driContext->driReadablePriv;
+   if (drawable && drawable->dri2.stamp != driContext->dri2.read_stamp) {
+      if (drawable->lastStamp != drawable->dri2.stamp)
+	 intel_update_renderbuffers(driContext, drawable);
+      driContext->dri2.read_stamp = drawable->dri2.stamp;
+   }
+
+   /* If we're currently rendering to the front buffer, the rendering
+    * that will happen next will probably dirty the front buffer.  So
+    * mark it as dirty here.
+    */
+   if (intel->is_front_buffer_rendering)
+      intel->front_buffer_dirty = true;
+
+   /* Wait for the swapbuffers before the one we just emitted, so we
+    * don't get too many swaps outstanding for apps that are GPU-heavy
+    * but not CPU-heavy.
+    *
+    * We're using intelDRI2Flush (called from the loader before
+    * swapbuffer) and glFlush (for front buffer rendering) as the
+    * indicator that a frame is done and then throttle when we get
+    * here as we prepare to render the next frame.  At this point for
+    * round trips for swap/copy and getting new buffers are done and
+    * we'll spend less time waiting on the GPU.
+    *
+    * Unfortunately, we don't have a handle to the batch containing
+    * the swap, and getting our hands on that doesn't seem worth it,
+    * so we just us the first batch we emitted after the last swap.
+    */
+   if (intel->need_throttle && intel->first_post_swapbuffers_batch) {
+      if (!intel->disable_throttling)
+         drm_intel_bo_wait_rendering(intel->first_post_swapbuffers_batch);
+      drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
+      intel->first_post_swapbuffers_batch = NULL;
+      intel->need_throttle = false;
+   }
+}
+
+static void
+intel_viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
+{
+    struct intel_context *intel = intel_context(ctx);
+    __DRIcontext *driContext = intel->driContext;
+
+    if (intel->saved_viewport)
+	intel->saved_viewport(ctx, x, y, w, h);
+
+    if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
+       dri2InvalidateDrawable(driContext->driDrawablePriv);
+       dri2InvalidateDrawable(driContext->driReadablePriv);
+    }
+}
+
+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_PERF},
+   { "perf",  DEBUG_PERF},
+   { "bat",   DEBUG_BATCH},
+   { "pix",   DEBUG_PIXEL},
+   { "buf",   DEBUG_BUFMGR},
+   { "reg",   DEBUG_REGION},
+   { "fbo",   DEBUG_FBO},
+   { "fs",    DEBUG_WM },
+   { "gs",    DEBUG_GS},
+   { "sync",  DEBUG_SYNC},
+   { "prim",  DEBUG_PRIMS },
+   { "vert",  DEBUG_VERTS },
+   { "dri",   DEBUG_DRI },
+   { "sf",    DEBUG_SF },
+   { "stats", DEBUG_STATS },
+   { "wm",    DEBUG_WM },
+   { "urb",   DEBUG_URB },
+   { "vs",    DEBUG_VS },
+   { "clip",  DEBUG_CLIP },
+   { "aub",   DEBUG_AUB },
+   { "shader_time", DEBUG_SHADER_TIME },
+   { "no16",  DEBUG_NO16 },
+   { "blorp", DEBUG_BLORP },
+   { NULL,    0 }
+};
+
+
+static void
+intelInvalidateState(struct gl_context * ctx, GLuint new_state)
+{
+    struct intel_context *intel = intel_context(ctx);
+
+    if (ctx->swrast_context)
+       _swrast_InvalidateState(ctx, new_state);
+   _vbo_InvalidateState(ctx, new_state);
+
+   intel->NewGLState |= new_state;
+
+   if (intel->vtbl.invalidate_state)
+      intel->vtbl.invalidate_state( intel, new_state );
+}
+
+void
+intel_flush_rendering_to_batch(struct gl_context *ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+
+   if (intel->Fallback)
+      _swrast_flush(ctx);
+
+   if (intel->gen < 4)
+      INTEL_FIREVERTICES(intel);
+}
+
+void
+_intel_flush(struct gl_context *ctx, const char *file, int line)
+{
+   struct intel_context *intel = intel_context(ctx);
+
+   intel_flush_rendering_to_batch(ctx);
+
+   if (intel->batch.used)
+      _intel_batchbuffer_flush(intel, file, line);
+}
+
+static void
+intel_glFlush(struct gl_context *ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+
+   intel_flush(ctx);
+   intel_flush_front(ctx);
+   if (intel->is_front_buffer_rendering)
+      intel->need_throttle = true;
+}
+
+void
+intelFinish(struct gl_context * ctx)
+{
+   struct intel_context *intel = intel_context(ctx);
+
+   intel_flush(ctx);
+   intel_flush_front(ctx);
+
+   if (intel->batch.last_bo)
+      drm_intel_bo_wait_rendering(intel->batch.last_bo);
+}
+
+void
+intelInitDriverFunctions(struct dd_function_table *functions)
+{
+   _mesa_init_driver_functions(functions);
+
+   functions->Flush = intel_glFlush;
+   functions->Finish = intelFinish;
+   functions->GetString = intelGetString;
+   functions->UpdateState = intelInvalidateState;
+
+   intelInitTextureFuncs(functions);
+   intelInitTextureImageFuncs(functions);
+   intelInitTextureSubImageFuncs(functions);
+   intelInitTextureCopyImageFuncs(functions);
+   intelInitClearFuncs(functions);
+   intelInitBufferFuncs(functions);
+   intelInitPixelFuncs(functions);
+   intelInitBufferObjectFuncs(functions);
+   intel_init_syncobj_functions(functions);
+}
+
+static bool
+validate_context_version(struct intel_screen *screen,
+                         int mesa_api,
+                         unsigned major_version,
+                         unsigned minor_version,
+                         unsigned *dri_ctx_error)
+{
+   unsigned req_version = 10 * major_version + minor_version;
+   unsigned max_version = 0;
+
+   switch (mesa_api) {
+   case API_OPENGL_COMPAT:
+      max_version = screen->max_gl_compat_version;
+      break;
+   case API_OPENGL_CORE:
+      max_version = screen->max_gl_core_version;
+      break;
+   case API_OPENGLES:
+      max_version = screen->max_gl_es1_version;
+      break;
+   case API_OPENGLES2:
+      max_version = screen->max_gl_es2_version;
+      break;
+   default:
+      max_version = 0;
+      break;
+   }
+
+   if (max_version == 0) {
+      *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
+      return false;
+   } else if (req_version > max_version) {
+      *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
+      return false;
+   }
+
+   return true;
+}
+
+bool
+intelInitContext(struct intel_context *intel,
+                 int api,
+                 unsigned major_version,
+                 unsigned minor_version,
+                 const struct gl_config * mesaVis,
+                 __DRIcontext * driContextPriv,
+                 void *sharedContextPrivate,
+                 struct dd_function_table *functions,
+                 unsigned *dri_ctx_error)
+{
+   struct gl_context *ctx = &intel->ctx;
+   struct gl_context *shareCtx = (struct gl_context *) sharedContextPrivate;
+   __DRIscreen *sPriv = driContextPriv->driScreenPriv;
+   struct intel_screen *intelScreen = sPriv->driverPrivate;
+   int bo_reuse_mode;
+   struct gl_config visual;
+
+   /* we can't do anything without a connection to the device */
+   if (intelScreen->bufmgr == NULL) {
+      *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
+      return false;
+   }
+
+   if (!validate_context_version(intelScreen,
+                                 api, major_version, minor_version,
+                                 dri_ctx_error))
+      return false;
+
+   /* Can't rely on invalidate events, fall back to glViewport hack */
+   if (!driContextPriv->driScreenPriv->dri2.useInvalidate) {
+      intel->saved_viewport = functions->Viewport;
+      functions->Viewport = intel_viewport;
+   }
+
+   if (mesaVis == NULL) {
+      memset(&visual, 0, sizeof visual);
+      mesaVis = &visual;
+   }
+
+   intel->intelScreen = intelScreen;
+
+   if (!_mesa_initialize_context(&intel->ctx, api, mesaVis, shareCtx,
+                                 functions)) {
+      *dri_ctx_error = __DRI_CTX_ERROR_NO_MEMORY;
+      printf("%s: failed to init mesa context\n", __FUNCTION__);
+      return false;
+   }
+
+   driContextPriv->driverPrivate = intel;
+   intel->driContext = driContextPriv;
+   intel->driFd = sPriv->fd;
+
+   intel->gen = intelScreen->gen;
+
+   const int devID = intelScreen->deviceID;
+   if (IS_SNB_GT1(devID) || IS_IVB_GT1(devID) || IS_HSW_GT1(devID))
+      intel->gt = 1;
+   else if (IS_SNB_GT2(devID) || IS_IVB_GT2(devID) || IS_HSW_GT2(devID))
+      intel->gt = 2;
+   else if (IS_HSW_GT3(devID))
+      intel->gt = 3;
+   else
+      intel->gt = 0;
+
+   if (IS_HASWELL(devID)) {
+      intel->is_haswell = true;
+   } else if (IS_BAYTRAIL(devID)) {
+      intel->is_baytrail = true;
+      intel->gt = 1;
+   } else if (IS_G4X(devID)) {
+      intel->is_g4x = true;
+   } else if (IS_945(devID)) {
+      intel->is_945 = true;
+   }
+
+   if (intel->gen >= 5) {
+      intel->needs_ff_sync = true;
+   }
+
+   intel->has_separate_stencil = intel->intelScreen->hw_has_separate_stencil;
+   intel->must_use_separate_stencil = intel->intelScreen->hw_must_use_separate_stencil;
+   intel->has_hiz = intel->gen >= 6;
+   intel->has_llc = intel->intelScreen->hw_has_llc;
+   intel->has_swizzling = intel->intelScreen->hw_has_swizzling;
+
+   memset(&ctx->TextureFormatSupported,
+	  0, sizeof(ctx->TextureFormatSupported));
+
+   driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
+                       sPriv->myNum, (intel->gen >= 4) ? "i965" : "i915");
+   if (intel->gen < 4)
+      intel->maxBatchSize = 4096;
+   else
+      intel->maxBatchSize = BATCH_SZ;
+
+   /* Estimate the size of the mappable aperture into the GTT.  There's an
+    * ioctl to get the whole GTT size, but not one to get the mappable subset.
+    * It turns out it's basically always 256MB, though some ancient hardware
+    * was smaller.
+    */
+   uint32_t gtt_size = 256 * 1024 * 1024;
+   if (intel->gen == 2)
+      gtt_size = 128 * 1024 * 1024;
+
+   /* We don't want to map two objects such that a memcpy between them would
+    * just fault one mapping in and then the other over and over forever.  So
+    * we would need to divide the GTT size by 2.  Additionally, some GTT is
+    * taken up by things like the framebuffer and the ringbuffer and such, so
+    * be more conservative.
+    */
+   intel->max_gtt_map_object_size = gtt_size / 4;
+
+   intel->bufmgr = intelScreen->bufmgr;
+
+   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.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;
+
+   if (intel->gen >= 6)
+      ctx->Const.MaxClipPlanes = 8;
+
+   ctx->Const.StripTextureBorder = GL_TRUE;
+
+   /* reinitialize the context point state.
+    * It depend on constants in __struct gl_contextRec::Const
+    */
+   _mesa_init_point(ctx);
+
+   if (intel->gen >= 4) {
+      ctx->Const.MaxRenderbufferSize = 8192;
+   } else {
+      ctx->Const.MaxRenderbufferSize = 2048;
+   }
+
+   /* Initialize the software rasterizer and helper modules.
+    *
+    * As of GL 3.1 core, the gen4+ driver doesn't need the swrast context for
+    * software fallbacks (which we have to support on legacy GL to do weird
+    * glDrawPixels(), glBitmap(), and other functions).
+    */
+   if (intel->gen <= 3 || api != API_OPENGL_CORE) {
+      _swrast_CreateContext(ctx);
+   }
+
+   _vbo_CreateContext(ctx);
+   if (ctx->swrast_context) {
+      _tnl_CreateContext(ctx);
+      _swsetup_CreateContext(ctx);
+
+      /* Configure swrast to match hardware characteristics: */
+      _swrast_allow_pixel_fog(ctx, false);
+      _swrast_allow_vertex_fog(ctx, true);
+   }
+
+   _mesa_meta_init(ctx);
+
+   intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
+   intel->hw_stipple = 1;
+
+   intel->RenderIndex = ~0;
+
+   intelInitExtensions(ctx);
+
+   INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
+   if (INTEL_DEBUG & DEBUG_BUFMGR)
+      dri_bufmgr_set_debug(intel->bufmgr, true);
+   if ((INTEL_DEBUG & DEBUG_SHADER_TIME) && intel->gen < 7) {
+      fprintf(stderr,
+              "shader_time debugging requires gen7 (Ivybridge) or better.\n");
+      INTEL_DEBUG &= ~DEBUG_SHADER_TIME;
+   }
+   if (INTEL_DEBUG & DEBUG_PERF)
+      intel->perf_debug = true;
+
+   if (INTEL_DEBUG & DEBUG_AUB)
+      drm_intel_bufmgr_gem_set_aub_dump(intel->bufmgr, true);
+
+   intel_batchbuffer_init(intel);
+
+   intel_fbo_init(intel);
+
+   intel->use_early_z = driQueryOptionb(&intel->optionCache, "early_z");
+
+   if (!driQueryOptionb(&intel->optionCache, "hiz")) {
+       intel->has_hiz = false;
+       /* On gen6, you can only do separate stencil with HIZ. */
+       if (intel->gen == 6)
+	  intel->has_separate_stencil = false;
+   }
+
+   intel->prim.primitive = ~0;
+
+   /* Force all software fallbacks */
+#ifdef I915
+   if (driQueryOptionb(&intel->optionCache, "no_rast")) {
+      fprintf(stderr, "disabling 3D rasterization\n");
+      intel->no_rast = 1;
+   }
+#endif
+
+   if (driQueryOptionb(&intel->optionCache, "always_flush_batch")) {
+      fprintf(stderr, "flushing batchbuffer before/after each draw call\n");
+      intel->always_flush_batch = 1;
+   }
+
+   if (driQueryOptionb(&intel->optionCache, "always_flush_cache")) {
+      fprintf(stderr, "flushing GPU caches before/after each draw call\n");
+      intel->always_flush_cache = 1;
+   }
+
+   if (driQueryOptionb(&intel->optionCache, "disable_throttling")) {
+      fprintf(stderr, "disabling flush throttling\n");
+      intel->disable_throttling = 1;
+   }
+
+   return true;
+}
+
+void
+intelDestroyContext(__DRIcontext * driContextPriv)
+{
+   struct intel_context *intel =
+      (struct intel_context *) driContextPriv->driverPrivate;
+   struct gl_context *ctx = &intel->ctx;
+
+   assert(intel);               /* should never be null */
+   if (intel) {
+      INTEL_FIREVERTICES(intel);
+
+      /* Dump a final BMP in case the application doesn't call SwapBuffers */
+      if (INTEL_DEBUG & DEBUG_AUB) {
+         intel_batchbuffer_flush(intel);
+	 aub_dump_bmp(&intel->ctx);
+      }
+
+      _mesa_meta_free(&intel->ctx);
+
+      intel->vtbl.destroy(intel);
+
+      if (ctx->swrast_context) {
+         _swsetup_DestroyContext(&intel->ctx);
+         _tnl_DestroyContext(&intel->ctx);
+      }
+      _vbo_DestroyContext(&intel->ctx);
+
+      if (ctx->swrast_context)
+         _swrast_DestroyContext(&intel->ctx);
+      intel->Fallback = 0x0;      /* don't call _swrast_Flush later */
+
+      intel_batchbuffer_free(intel);
+
+      free(intel->prim.vb);
+      intel->prim.vb = NULL;
+      drm_intel_bo_unreference(intel->prim.vb_bo);
+      intel->prim.vb_bo = NULL;
+      drm_intel_bo_unreference(intel->first_post_swapbuffers_batch);
+      intel->first_post_swapbuffers_batch = NULL;
+
+      driDestroyOptionCache(&intel->optionCache);
+
+      /* free the Mesa context */
+      _mesa_free_context_data(&intel->ctx);
+
+      _math_matrix_dtr(&intel->ViewportMatrix);
+
+      ralloc_free(intel);
+      driContextPriv->driverPrivate = NULL;
+   }
+}
+
+GLboolean
+intelUnbindContext(__DRIcontext * driContextPriv)
+{
+   /* Unset current context and dispath table */
+   _mesa_make_current(NULL, NULL, NULL);
+
+   return true;
+}
+
+/**
+ * Fixes up the context for GLES23 with our default-to-sRGB-capable behavior
+ * on window system framebuffers.
+ *
+ * Desktop GL is fairly reasonable in its handling of sRGB: You can ask if
+ * your renderbuffer can do sRGB encode, and you can flip a switch that does
+ * sRGB encode if the renderbuffer can handle it.  You can ask specifically
+ * for a visual where you're guaranteed to be capable, but it turns out that
+ * everyone just makes all their ARGB8888 visuals capable and doesn't offer
+ * incapable ones, becuase there's no difference between the two in resources
+ * used.  Applications thus get built that accidentally rely on the default
+ * visual choice being sRGB, so we make ours sRGB capable.  Everything sounds
+ * great...
+ *
+ * But for GLES2/3, they decided that it was silly to not turn on sRGB encode
+ * for sRGB renderbuffers you made with the GL_EXT_texture_sRGB equivalent.
+ * So they removed the enable knob and made it "if the renderbuffer is sRGB
+ * capable, do sRGB encode".  Then, for your window system renderbuffers, you
+ * can ask for sRGB visuals and get sRGB encode, or not ask for sRGB visuals
+ * and get no sRGB encode (assuming that both kinds of visual are available).
+ * Thus our choice to support sRGB by default on our visuals for desktop would
+ * result in broken rendering of GLES apps that aren't expecting sRGB encode.
+ *
+ * Unfortunately, renderbuffer setup happens before a context is created.  So
+ * in intel_screen.c we always set up sRGB, and here, if you're a GLES2/3
+ * context (without an sRGB visual, though we don't have sRGB visuals exposed
+ * yet), we go turn that back off before anyone finds out.
+ */
+static void
+intel_gles3_srgb_workaround(struct intel_context *intel,
+                            struct gl_framebuffer *fb)
+{
+   struct gl_context *ctx = &intel->ctx;
+
+   if (_mesa_is_desktop_gl(ctx) || !fb->Visual.sRGBCapable)
+      return;
+
+   /* Some day when we support the sRGB capable bit on visuals available for
+    * GLES, we'll need to respect that and not disable things here.
+    */
+   fb->Visual.sRGBCapable = false;
+   for (int i = 0; i < BUFFER_COUNT; i++) {
+      if (fb->Attachment[i].Renderbuffer &&
+          fb->Attachment[i].Renderbuffer->Format == MESA_FORMAT_SARGB8) {
+         fb->Attachment[i].Renderbuffer->Format = MESA_FORMAT_ARGB8888;
+      }
+   }
+}
+
+GLboolean
+intelMakeCurrent(__DRIcontext * driContextPriv,
+                 __DRIdrawable * driDrawPriv,
+                 __DRIdrawable * driReadPriv)
+{
+   struct intel_context *intel;
+   GET_CURRENT_CONTEXT(curCtx);
+
+   if (driContextPriv)
+      intel = (struct intel_context *) driContextPriv->driverPrivate;
+   else
+      intel = NULL;
+
+   /* According to the glXMakeCurrent() man page: "Pending commands to
+    * the previous context, if any, are flushed before it is released."
+    * But only flush if we're actually changing contexts.
+    */
+   if (intel_context(curCtx) && intel_context(curCtx) != intel) {
+      _mesa_flush(curCtx);
+   }
+
+   if (driContextPriv) {
+      struct gl_context *ctx = &intel->ctx;
+      struct gl_framebuffer *fb, *readFb;
+      
+      if (driDrawPriv == NULL && driReadPriv == NULL) {
+	 fb = _mesa_get_incomplete_framebuffer();
+	 readFb = _mesa_get_incomplete_framebuffer();
+      } else {
+	 fb = driDrawPriv->driverPrivate;
+	 readFb = driReadPriv->driverPrivate;
+	 driContextPriv->dri2.draw_stamp = driDrawPriv->dri2.stamp - 1;
+	 driContextPriv->dri2.read_stamp = driReadPriv->dri2.stamp - 1;
+      }
+
+      intel_prepare_render(intel);
+      _mesa_make_current(ctx, fb, readFb);
+
+      intel_gles3_srgb_workaround(intel, ctx->WinSysDrawBuffer);
+      intel_gles3_srgb_workaround(intel, ctx->WinSysReadBuffer);
+
+      /* We do this in intel_prepare_render() too, but intel->ctx.DrawBuffer
+       * is NULL at that point.  We can't call _mesa_makecurrent()
+       * first, since we need the buffer size for the initial
+       * viewport.  So just call intel_draw_buffer() again here. */
+      intel_draw_buffer(ctx);
+   }
+   else {
+      _mesa_make_current(NULL, NULL, NULL);
+   }
+
+   return true;
+}
+
+/**
+ * \brief Query DRI2 to obtain a DRIdrawable's buffers.
+ *
+ * To determine which DRI buffers to request, examine the renderbuffers
+ * attached to the drawable's framebuffer. Then request the buffers with
+ * DRI2GetBuffers() or DRI2GetBuffersWithFormat().
+ *
+ * This is called from intel_update_renderbuffers().
+ *
+ * \param drawable      Drawable whose buffers are queried.
+ * \param buffers       [out] List of buffers returned by DRI2 query.
+ * \param buffer_count  [out] Number of buffers returned.
+ *
+ * \see intel_update_renderbuffers()
+ * \see DRI2GetBuffers()
+ * \see DRI2GetBuffersWithFormat()
+ */
+static void
+intel_query_dri2_buffers(struct intel_context *intel,
+			 __DRIdrawable *drawable,
+			 __DRIbuffer **buffers,
+			 int *buffer_count)
+{
+   __DRIscreen *screen = intel->intelScreen->driScrnPriv;
+   struct gl_framebuffer *fb = drawable->driverPrivate;
+   int i = 0;
+   unsigned attachments[8];
+
+   struct intel_renderbuffer *front_rb;
+   struct intel_renderbuffer *back_rb;
+
+   front_rb = intel_get_renderbuffer(fb, BUFFER_FRONT_LEFT);
+   back_rb = intel_get_renderbuffer(fb, BUFFER_BACK_LEFT);
+
+   memset(attachments, 0, sizeof(attachments));
+   if ((intel->is_front_buffer_rendering ||
+	intel->is_front_buffer_reading ||
+	!back_rb) && front_rb) {
+      /* If a fake front buffer is in use, then querying for
+       * __DRI_BUFFER_FRONT_LEFT will cause the server to copy the image from
+       * the real front buffer to the fake front buffer.  So before doing the
+       * query, we need to make sure all the pending drawing has landed in the
+       * real front buffer.
+       */
+      intel_flush(&intel->ctx);
+      intel_flush_front(&intel->ctx);
+
+      attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
+      attachments[i++] = intel_bits_per_pixel(front_rb);
+   } else if (front_rb && intel->front_buffer_dirty) {
+      /* We have pending front buffer rendering, but we aren't querying for a
+       * front buffer.  If the front buffer we have is a fake front buffer,
+       * the X server is going to throw it away when it processes the query.
+       * So before doing the query, make sure all the pending drawing has
+       * landed in the real front buffer.
+       */
+      intel_flush(&intel->ctx);
+      intel_flush_front(&intel->ctx);
+   }
+
+   if (back_rb) {
+      attachments[i++] = __DRI_BUFFER_BACK_LEFT;
+      attachments[i++] = intel_bits_per_pixel(back_rb);
+   }
+
+   assert(i <= ARRAY_SIZE(attachments));
+
+   *buffers = screen->dri2.loader->getBuffersWithFormat(drawable,
+							&drawable->w,
+							&drawable->h,
+							attachments, i / 2,
+							buffer_count,
+							drawable->loaderPrivate);
+}
+
+/**
+ * \brief Assign a DRI buffer's DRM region to a renderbuffer.
+ *
+ * This is called from intel_update_renderbuffers().
+ *
+ * \par Note:
+ *    DRI buffers whose attachment point is DRI2BufferStencil or
+ *    DRI2BufferDepthStencil are handled as special cases.
+ *
+ * \param buffer_name is a human readable name, such as "dri2 front buffer",
+ *        that is passed to intel_region_alloc_for_handle().
+ *
+ * \see intel_update_renderbuffers()
+ * \see intel_region_alloc_for_handle()
+ */
+static void
+intel_process_dri2_buffer(struct intel_context *intel,
+			  __DRIdrawable *drawable,
+			  __DRIbuffer *buffer,
+			  struct intel_renderbuffer *rb,
+			  const char *buffer_name)
+{
+   struct intel_region *region = NULL;
+
+   if (!rb)
+      return;
+
+   unsigned num_samples = rb->Base.Base.NumSamples;
+
+   /* We try to avoid closing and reopening the same BO name, because the first
+    * use of a mapping of the buffer involves a bunch of page faulting which is
+    * moderately expensive.
+    */
+   if (num_samples == 0) {
+       if (rb->mt &&
+           rb->mt->region &&
+           rb->mt->region->name == buffer->name)
+          return;
+   } else {
+       if (rb->mt &&
+           rb->mt->singlesample_mt &&
+           rb->mt->singlesample_mt->region &&
+           rb->mt->singlesample_mt->region->name == buffer->name)
+          return;
+   }
+
+   if (unlikely(INTEL_DEBUG & DEBUG_DRI)) {
+      fprintf(stderr,
+	      "attaching buffer %d, at %d, cpp %d, pitch %d\n",
+	      buffer->name, buffer->attachment,
+	      buffer->cpp, buffer->pitch);
+   }
+
+   intel_miptree_release(&rb->mt);
+   region = intel_region_alloc_for_handle(intel->intelScreen,
+                                          buffer->cpp,
+                                          drawable->w,
+                                          drawable->h,
+                                          buffer->pitch,
+                                          buffer->name,
+                                          buffer_name);
+   if (!region)
+      return;
+
+   rb->mt = intel_miptree_create_for_dri2_buffer(intel,
+                                                 buffer->attachment,
+                                                 intel_rb_format(rb),
+                                                 num_samples,
+                                                 region);
+   intel_region_release(&region);
+}