src/mesa/drivers/dri/intel/intel_buffer_objects.c - fp2-dev/platform/external/mesa3d - Gitiles

 /**************************************************************************
  *
  * 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/imports.h"
 #include "main/mtypes.h"
 #include "main/macros.h"
 #include "main/bufferobj.h"

 #include "intel_context.h"
 #include "intel_blit.h"
 #include "intel_buffer_objects.h"
 #include "intel_batchbuffer.h"
 #include "intel_regions.h"

 static GLboolean
 intel_bufferobj_unmap(GLcontext * ctx,
                       GLenum target, struct gl_buffer_object *obj);

 /** Allocates a new dri_bo to store the data for the buffer object. */
 static void
 intel_bufferobj_alloc_buffer(struct intel_context *intel,
 			     struct intel_buffer_object *intel_obj)
 {
    intel_obj->buffer = dri_bo_alloc(intel->bufmgr, "bufferobj",
 				    intel_obj->Base.Size, 64);
 }

 /**
  * There is some duplication between mesa's bufferobjects and our
  * bufmgr buffers.  Both have an integer handle and a hashtable to
  * lookup an opaque structure.  It would be nice if the handles and
  * internal structure where somehow shared.
  */
 static struct gl_buffer_object *
 intel_bufferobj_alloc(GLcontext * ctx, GLuint name, GLenum target)
 {
    struct intel_buffer_object *obj = CALLOC_STRUCT(intel_buffer_object);

    _mesa_initialize_buffer_object(&obj->Base, name, target);

    obj->buffer = NULL;

    return &obj->Base;
 }

 /* Break the COW tie to the region.  The region gets to keep the data.
  */
 void
 intel_bufferobj_release_region(struct intel_context *intel,
                                struct intel_buffer_object *intel_obj)
 {
    assert(intel_obj->region->buffer == intel_obj->buffer);
    intel_obj->region->pbo = NULL;
    intel_obj->region = NULL;

    dri_bo_unreference(intel_obj->buffer);
    intel_obj->buffer = NULL;
 }

 /* Break the COW tie to the region.  Both the pbo and the region end
  * up with a copy of the data.
  */
 void
 intel_bufferobj_cow(struct intel_context *intel,
                     struct intel_buffer_object *intel_obj)
 {
    assert(intel_obj->region);
    intel_region_cow(intel, intel_obj->region);
 }


 /**
  * Deallocate/free a vertex/pixel buffer object.
  * Called via glDeleteBuffersARB().
  */
 static void
 intel_bufferobj_free(GLcontext * ctx, struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

    assert(intel_obj);

    /* Buffer objects are automatically unmapped when deleting according
     * to the spec, but Mesa doesn't do UnmapBuffer for us at context destroy
     * (though it does if you call glDeleteBuffers)
     */
    if (obj->Pointer)
       intel_bufferobj_unmap(ctx, 0, obj);

    _mesa_free(intel_obj->sys_buffer);
    if (intel_obj->region) {
       intel_bufferobj_release_region(intel, intel_obj);
    }
    else if (intel_obj->buffer) {
       dri_bo_unreference(intel_obj->buffer);
    }

    _mesa_free(intel_obj);
 }


 /**
  * Allocate space for and store data in a buffer object.  Any data that was
  * previously stored in the buffer object is lost.  If data is NULL,
  * memory will be allocated, but no copy will occur.
  * Called via ctx->Driver.BufferData().
  * \return GL_TRUE for success, GL_FALSE if out of memory
  */
 static GLboolean
 intel_bufferobj_data(GLcontext * ctx,
                      GLenum target,
                      GLsizeiptrARB size,
                      const GLvoid * data,
                      GLenum usage, struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

    intel_obj->Base.Size = size;
    intel_obj->Base.Usage = usage;

    assert(!obj->Pointer); /* Mesa should have unmapped it */

    if (intel_obj->region)
       intel_bufferobj_release_region(intel, intel_obj);

    if (intel_obj->buffer != NULL) {
       dri_bo_unreference(intel_obj->buffer);
       intel_obj->buffer = NULL;
    }
    _mesa_free(intel_obj->sys_buffer);
    intel_obj->sys_buffer = NULL;

    if (size != 0) {
 #ifdef I915
       /* On pre-965, stick VBOs in system memory, as we're always doing swtnl
        * with their contents anyway.
        */
       if (target == GL_ARRAY_BUFFER || target == GL_ELEMENT_ARRAY_BUFFER) {
 	 intel_obj->sys_buffer = _mesa_malloc(size);
 	 if (intel_obj->sys_buffer != NULL) {
 	    if (data != NULL)
 	       memcpy(intel_obj->sys_buffer, data, size);
 	    return GL_TRUE;
 	 }
       }
 #endif
       intel_bufferobj_alloc_buffer(intel, intel_obj);
       if (!intel_obj->buffer)
          return GL_FALSE;

       if (data != NULL)
 	 dri_bo_subdata(intel_obj->buffer, 0, size, data);
    }

    return GL_TRUE;
 }


 /**
  * Replace data in a subrange of buffer object.  If the data range
  * specified by size + offset extends beyond the end of the buffer or
  * if data is NULL, no copy is performed.
  * Called via glBufferSubDataARB().
  */
 static void
 intel_bufferobj_subdata(GLcontext * ctx,
                         GLenum target,
                         GLintptrARB offset,
                         GLsizeiptrARB size,
                         const GLvoid * data, struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

    assert(intel_obj);

    if (intel_obj->region)
       intel_bufferobj_cow(intel, intel_obj);

    if (intel_obj->sys_buffer)
       memcpy((char *)intel_obj->sys_buffer + offset, data, size);
    else {
       /* Flush any existing batchbuffer that might reference this data. */
       if (drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
 	 intelFlush(ctx);

       dri_bo_subdata(intel_obj->buffer, offset, size, data);
    }
 }


 /**
  * Called via glGetBufferSubDataARB().
  */
 static void
 intel_bufferobj_get_subdata(GLcontext * ctx,
                             GLenum target,
                             GLintptrARB offset,
                             GLsizeiptrARB size,
                             GLvoid * data, struct gl_buffer_object *obj)
 {
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

    assert(intel_obj);
    if (intel_obj->sys_buffer)
       memcpy(data, (char *)intel_obj->sys_buffer + offset, size);
    else
       dri_bo_get_subdata(intel_obj->buffer, offset, size, data);
 }


 /**
  * Called via glMapBufferARB().
  */
 static void *
 intel_bufferobj_map(GLcontext * ctx,
                     GLenum target,
                     GLenum access, struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
    GLboolean read_only = (access == GL_READ_ONLY_ARB);
    GLboolean write_only = (access == GL_WRITE_ONLY_ARB);

    assert(intel_obj);

    if (intel_obj->sys_buffer) {
       obj->Pointer = intel_obj->sys_buffer;
       return obj->Pointer;
    }

    /* Flush any existing batchbuffer that might reference this data. */
    if (drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
       intelFlush(ctx);

    if (intel_obj->region)
       intel_bufferobj_cow(intel, intel_obj);

    if (intel_obj->buffer == NULL) {
       obj->Pointer = NULL;
       return NULL;
    }

    if (write_only && intel->intelScreen->kernel_exec_fencing) {
       drm_intel_gem_bo_map_gtt(intel_obj->buffer);
       intel_obj->mapped_gtt = GL_TRUE;
    } else {
       drm_intel_bo_map(intel_obj->buffer, !read_only);
       intel_obj->mapped_gtt = GL_FALSE;
    }

    obj->Pointer = intel_obj->buffer->virtual;
    obj->Length = obj->Size;
    obj->Offset = 0;

    return obj->Pointer;
 }

 /**
  * Called via glMapBufferRange().
  *
  * The goal of this extension is to allow apps to accumulate their rendering
  * at the same time as they accumulate their buffer object.  Without it,
  * you'd end up blocking on execution of rendering every time you mapped
  * the buffer to put new data in.
  *
  * We support it in 3 ways: If unsynchronized, then don't bother
  * flushing the batchbuffer before mapping the buffer, which can save blocking
  * in many cases.  If we would still block, and they allow the whole buffer
  * to be invalidated, then just allocate a new buffer to replace the old one.
  * If not, and we'd block, and they allow the subrange of the buffer to be
  * invalidated, then we can make a new little BO, let them write into that,
  * and blit it into the real BO at unmap time.
  */
 static void *
 intel_bufferobj_map_range(GLcontext * ctx,
 			  GLenum target, GLintptr offset, GLsizeiptr length,
 			  GLbitfield access, struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

    assert(intel_obj);

    /* _mesa_MapBufferRange (GL entrypoint) sets these, but the vbo module also
     * internally uses our functions directly.
     */
    obj->Offset = offset;
    obj->Length = length;
    obj->AccessFlags = access;

    if (intel_obj->sys_buffer) {
       obj->Pointer = intel_obj->sys_buffer + offset;
       return obj->Pointer;
    }

    if (intel_obj->region)
       intel_bufferobj_cow(intel, intel_obj);

    /* If the mapping is synchronized with other GL operations, flush
     * the batchbuffer so that GEM knows about the buffer access for later
     * syncing.
     */
    if (!(access & GL_MAP_UNSYNCHRONIZED_BIT) &&
        drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
       intelFlush(ctx);

    if (intel_obj->buffer == NULL) {
       obj->Pointer = NULL;
       return NULL;
    }

    /* If the user doesn't care about existing buffer contents and mapping
     * would cause us to block, then throw out the old buffer.
     */
    if (!(access & GL_MAP_UNSYNCHRONIZED_BIT) &&
        (access & GL_MAP_INVALIDATE_BUFFER_BIT) &&
        drm_intel_bo_busy(intel_obj->buffer)) {
       drm_intel_bo_unreference(intel_obj->buffer);
       intel_obj->buffer = dri_bo_alloc(intel->bufmgr, "bufferobj",
 				       intel_obj->Base.Size, 64);
    }

    /* If the user is mapping a range of an active buffer object but
     * doesn't require the current contents of that range, make a new
     * BO, and we'll copy what they put in there out at unmap or
     * FlushRange time.
     */
    if ((access & GL_MAP_INVALIDATE_RANGE_BIT) &&
        drm_intel_bo_busy(intel_obj->buffer)) {
       if (access & GL_MAP_FLUSH_EXPLICIT_BIT) {
 	 intel_obj->range_map_buffer = _mesa_malloc(length);
 	 obj->Pointer = intel_obj->range_map_buffer;
       } else {
 	 intel_obj->range_map_bo = drm_intel_bo_alloc(intel->bufmgr,
 						      "range map",
 						      length, 64);
 	 if (!(access & GL_MAP_READ_BIT) &&
 	     intel->intelScreen->kernel_exec_fencing) {
 	    drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
 	    intel_obj->mapped_gtt = GL_TRUE;
 	 } else {
 	    drm_intel_bo_map(intel_obj->range_map_bo,
 			     (access & GL_MAP_WRITE_BIT) != 0);
 	    intel_obj->mapped_gtt = GL_FALSE;
 	 }
 	 obj->Pointer = intel_obj->range_map_bo->virtual;
       }
       return obj->Pointer;
    }

    if (!(access & GL_MAP_READ_BIT) &&
        intel->intelScreen->kernel_exec_fencing) {
       drm_intel_gem_bo_map_gtt(intel_obj->buffer);
       intel_obj->mapped_gtt = GL_TRUE;
    } else {
       drm_intel_bo_map(intel_obj->buffer, (access & GL_MAP_WRITE_BIT) != 0);
       intel_obj->mapped_gtt = GL_FALSE;
    }

    obj->Pointer = intel_obj->buffer->virtual + offset;
    return obj->Pointer;
 }

 /* Ideally we'd use a BO to avoid taking up cache space for the temporary
  * data, but FlushMappedBufferRange may be followed by further writes to
  * the pointer, so we would have to re-map after emitting our blit, which
  * would defeat the point.
  */
 static void
 intel_bufferobj_flush_mapped_range(GLcontext *ctx, GLenum target,
 				   GLintptr offset, GLsizeiptr length,
 				   struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
    drm_intel_bo *temp_bo;

    /* Unless we're in the range map using a temporary system buffer,
     * there's no work to do.
     */
    if (intel_obj->range_map_buffer == NULL)
       return;

    temp_bo = drm_intel_bo_alloc(intel->bufmgr, "range map flush", length, 64);

    drm_intel_bo_subdata(temp_bo, 0, length, intel_obj->range_map_buffer);

    intel_emit_linear_blit(intel,
 			  intel_obj->buffer, obj->Offset + offset,
 			  temp_bo, 0,
 			  length);

    drm_intel_bo_unreference(temp_bo);
 }


 /**
  * Called via glUnmapBuffer().
  */
 static GLboolean
 intel_bufferobj_unmap(GLcontext * ctx,
                       GLenum target, struct gl_buffer_object *obj)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

    assert(intel_obj);
    assert(obj->Pointer);
    if (intel_obj->sys_buffer != NULL) {
       /* always keep the mapping around. */
    } else if (intel_obj->range_map_buffer != NULL) {
       /* Since we've emitted some blits to buffers that will (likely) be used
        * in rendering operations in other cache domains in this batch, emit a
        * flush.  Once again, we wish for a domain tracker in libdrm to cover
        * usage inside of a batchbuffer.
        */
       intel_batchbuffer_emit_mi_flush(intel->batch);
       free(intel_obj->range_map_buffer);
       intel_obj->range_map_buffer = NULL;
    } else if (intel_obj->range_map_bo != NULL) {
       if (intel_obj->mapped_gtt) {
 	 drm_intel_gem_bo_unmap_gtt(intel_obj->range_map_bo);
       } else {
 	 drm_intel_bo_unmap(intel_obj->range_map_bo);
       }

       intel_emit_linear_blit(intel,
 			     intel_obj->buffer, obj->Offset,
 			     intel_obj->range_map_bo, 0,
 			     obj->Length);

       /* Since we've emitted some blits to buffers that will (likely) be used
        * in rendering operations in other cache domains in this batch, emit a
        * flush.  Once again, we wish for a domain tracker in libdrm to cover
        * usage inside of a batchbuffer.
        */
       intel_batchbuffer_emit_mi_flush(intel->batch);

       drm_intel_bo_unreference(intel_obj->range_map_bo);
       intel_obj->range_map_bo = NULL;
    } else if (intel_obj->buffer != NULL) {
       if (intel_obj->mapped_gtt) {
 	 drm_intel_gem_bo_unmap_gtt(intel_obj->buffer);
       } else {
 	 drm_intel_bo_unmap(intel_obj->buffer);
       }
    }
    obj->Pointer = NULL;
    obj->Offset = 0;
    obj->Length = 0;

    return GL_TRUE;
 }

 dri_bo *
 intel_bufferobj_buffer(struct intel_context *intel,
                        struct intel_buffer_object *intel_obj, GLuint flag)
 {
    if (intel_obj->region) {
       if (flag == INTEL_WRITE_PART)
          intel_bufferobj_cow(intel, intel_obj);
       else if (flag == INTEL_WRITE_FULL) {
          intel_bufferobj_release_region(intel, intel_obj);
 	 intel_bufferobj_alloc_buffer(intel, intel_obj);
       }
    }

    if (intel_obj->buffer == NULL) {
       void *sys_buffer = intel_obj->sys_buffer;

       /* only one of buffer and sys_buffer could be non-NULL */
       intel_bufferobj_alloc_buffer(intel, intel_obj);
       intel_obj->sys_buffer = NULL;

       intel_bufferobj_subdata(&intel->ctx,
 			      GL_ARRAY_BUFFER_ARB,
 			      0,
 			      intel_obj->Base.Size,
 			      sys_buffer,
 			      &intel_obj->Base);
       _mesa_free(sys_buffer);
       intel_obj->sys_buffer = NULL;
    }

    return intel_obj->buffer;
 }

 static void
 intel_bufferobj_copy_subdata(GLcontext *ctx,
 			     struct gl_buffer_object *src,
 			     struct gl_buffer_object *dst,
 			     GLintptr read_offset, GLintptr write_offset,
 			     GLsizeiptr size)
 {
    struct intel_context *intel = intel_context(ctx);
    struct intel_buffer_object *intel_src = intel_buffer_object(src);
    struct intel_buffer_object *intel_dst = intel_buffer_object(dst);
    drm_intel_bo *src_bo, *dst_bo;

    if (size == 0)
       return;

    /* If we're in system memory, just map and memcpy. */
    if (intel_src->sys_buffer || intel_dst->sys_buffer) {
       /* The same buffer may be used, but note that regions copied may
        * not overlap.
        */
       if (src == dst) {
 	 char *ptr = intel_bufferobj_map(ctx, GL_COPY_WRITE_BUFFER,
 					 GL_READ_WRITE, dst);
 	 memcpy(ptr + write_offset, ptr + read_offset, size);
 	 intel_bufferobj_unmap(ctx, GL_COPY_WRITE_BUFFER, dst);
       } else {
 	 const char *src_ptr;
 	 char *dst_ptr;

 	 src_ptr =  intel_bufferobj_map(ctx, GL_COPY_READ_BUFFER,
 					GL_READ_ONLY, src);
 	 dst_ptr =  intel_bufferobj_map(ctx, GL_COPY_WRITE_BUFFER,
 					GL_WRITE_ONLY, dst);

 	 memcpy(dst_ptr + write_offset, src_ptr + read_offset, size);

 	 intel_bufferobj_unmap(ctx, GL_COPY_READ_BUFFER, src);
 	 intel_bufferobj_unmap(ctx, GL_COPY_WRITE_BUFFER, dst);
       }
    }

    /* Otherwise, we have real BOs, so blit them. */

    dst_bo = intel_bufferobj_buffer(intel, intel_dst, INTEL_WRITE_PART);
    src_bo = intel_bufferobj_buffer(intel, intel_src, INTEL_READ);

    intel_emit_linear_blit(intel,
 			  dst_bo, write_offset,
 			  src_bo, read_offset, size);

    /* Since we've emitted some blits to buffers that will (likely) be used
     * in rendering operations in other cache domains in this batch, emit a
     * flush.  Once again, we wish for a domain tracker in libdrm to cover
     * usage inside of a batchbuffer.
     */
    intel_batchbuffer_emit_mi_flush(intel->batch);
 }

 void
 intelInitBufferObjectFuncs(struct dd_function_table *functions)
 {
    functions->NewBufferObject = intel_bufferobj_alloc;
    functions->DeleteBuffer = intel_bufferobj_free;
    functions->BufferData = intel_bufferobj_data;
    functions->BufferSubData = intel_bufferobj_subdata;
    functions->GetBufferSubData = intel_bufferobj_get_subdata;
    functions->MapBuffer = intel_bufferobj_map;
    functions->MapBufferRange = intel_bufferobj_map_range;
    functions->FlushMappedBufferRange = intel_bufferobj_flush_mapped_range;
    functions->UnmapBuffer = intel_bufferobj_unmap;
    functions->CopyBufferSubData = intel_bufferobj_copy_subdata;
 }
	/**************************************************************************
	*
	* 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/imports.h"
	#include "main/mtypes.h"
	#include "main/macros.h"
	#include "main/bufferobj.h"

	#include "intel_context.h"
	#include "intel_blit.h"
	#include "intel_buffer_objects.h"
	#include "intel_batchbuffer.h"
	#include "intel_regions.h"

	static GLboolean
	intel_bufferobj_unmap(GLcontext * ctx,
	GLenum target, struct gl_buffer_object *obj);

	/** Allocates a new dri_bo to store the data for the buffer object. */
	static void
	intel_bufferobj_alloc_buffer(struct intel_context *intel,
	struct intel_buffer_object *intel_obj)
	{
	intel_obj->buffer = dri_bo_alloc(intel->bufmgr, "bufferobj",
	intel_obj->Base.Size, 64);
	}

	/**
	* There is some duplication between mesa's bufferobjects and our
	* bufmgr buffers. Both have an integer handle and a hashtable to
	* lookup an opaque structure. It would be nice if the handles and
	* internal structure where somehow shared.
	*/
	static struct gl_buffer_object *
	intel_bufferobj_alloc(GLcontext * ctx, GLuint name, GLenum target)
	{
	struct intel_buffer_object *obj = CALLOC_STRUCT(intel_buffer_object);

	_mesa_initialize_buffer_object(&obj->Base, name, target);

	obj->buffer = NULL;

	return &obj->Base;
	}

	/* Break the COW tie to the region. The region gets to keep the data.
	*/
	void
	intel_bufferobj_release_region(struct intel_context *intel,
	struct intel_buffer_object *intel_obj)
	{
	assert(intel_obj->region->buffer == intel_obj->buffer);
	intel_obj->region->pbo = NULL;
	intel_obj->region = NULL;

	dri_bo_unreference(intel_obj->buffer);
	intel_obj->buffer = NULL;
	}

	/* Break the COW tie to the region. Both the pbo and the region end
	* up with a copy of the data.
	*/
	void
	intel_bufferobj_cow(struct intel_context *intel,
	struct intel_buffer_object *intel_obj)
	{
	assert(intel_obj->region);
	intel_region_cow(intel, intel_obj->region);
	}


	/**
	* Deallocate/free a vertex/pixel buffer object.
	* Called via glDeleteBuffersARB().
	*/
	static void
	intel_bufferobj_free(GLcontext * ctx, struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

	assert(intel_obj);

	/* Buffer objects are automatically unmapped when deleting according
	* to the spec, but Mesa doesn't do UnmapBuffer for us at context destroy
	* (though it does if you call glDeleteBuffers)
	*/
	if (obj->Pointer)
	intel_bufferobj_unmap(ctx, 0, obj);

	_mesa_free(intel_obj->sys_buffer);
	if (intel_obj->region) {
	intel_bufferobj_release_region(intel, intel_obj);
	}
	else if (intel_obj->buffer) {
	dri_bo_unreference(intel_obj->buffer);
	}

	_mesa_free(intel_obj);
	}



	/**
	* Allocate space for and store data in a buffer object. Any data that was
	* previously stored in the buffer object is lost. If data is NULL,
	* memory will be allocated, but no copy will occur.
	* Called via ctx->Driver.BufferData().
	* \return GL_TRUE for success, GL_FALSE if out of memory
	*/
	static GLboolean
	intel_bufferobj_data(GLcontext * ctx,
	GLenum target,
	GLsizeiptrARB size,
	const GLvoid * data,
	GLenum usage, struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

	intel_obj->Base.Size = size;
	intel_obj->Base.Usage = usage;

	assert(!obj->Pointer); /* Mesa should have unmapped it */

	if (intel_obj->region)
	intel_bufferobj_release_region(intel, intel_obj);

	if (intel_obj->buffer != NULL) {
	dri_bo_unreference(intel_obj->buffer);
	intel_obj->buffer = NULL;
	}
	_mesa_free(intel_obj->sys_buffer);
	intel_obj->sys_buffer = NULL;

	if (size != 0) {
	#ifdef I915
	/* On pre-965, stick VBOs in system memory, as we're always doing swtnl
	* with their contents anyway.
	*/
	if (target == GL_ARRAY_BUFFER \|\| target == GL_ELEMENT_ARRAY_BUFFER) {
	intel_obj->sys_buffer = _mesa_malloc(size);
	if (intel_obj->sys_buffer != NULL) {
	if (data != NULL)
	memcpy(intel_obj->sys_buffer, data, size);
	return GL_TRUE;
	}
	}
	#endif
	intel_bufferobj_alloc_buffer(intel, intel_obj);
	if (!intel_obj->buffer)
	return GL_FALSE;

	if (data != NULL)
	dri_bo_subdata(intel_obj->buffer, 0, size, data);
	}

	return GL_TRUE;
	}


	/**
	* Replace data in a subrange of buffer object. If the data range
	* specified by size + offset extends beyond the end of the buffer or
	* if data is NULL, no copy is performed.
	* Called via glBufferSubDataARB().
	*/
	static void
	intel_bufferobj_subdata(GLcontext * ctx,
	GLenum target,
	GLintptrARB offset,
	GLsizeiptrARB size,
	const GLvoid * data, struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

	assert(intel_obj);

	if (intel_obj->region)
	intel_bufferobj_cow(intel, intel_obj);

	if (intel_obj->sys_buffer)
	memcpy((char *)intel_obj->sys_buffer + offset, data, size);
	else {
	/* Flush any existing batchbuffer that might reference this data. */
	if (drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
	intelFlush(ctx);

	dri_bo_subdata(intel_obj->buffer, offset, size, data);
	}
	}


	/**
	* Called via glGetBufferSubDataARB().
	*/
	static void
	intel_bufferobj_get_subdata(GLcontext * ctx,
	GLenum target,
	GLintptrARB offset,
	GLsizeiptrARB size,
	GLvoid * data, struct gl_buffer_object *obj)
	{
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

	assert(intel_obj);
	if (intel_obj->sys_buffer)
	memcpy(data, (char *)intel_obj->sys_buffer + offset, size);
	else
	dri_bo_get_subdata(intel_obj->buffer, offset, size, data);
	}



	/**
	* Called via glMapBufferARB().
	*/
	static void *
	intel_bufferobj_map(GLcontext * ctx,
	GLenum target,
	GLenum access, struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
	GLboolean read_only = (access == GL_READ_ONLY_ARB);
	GLboolean write_only = (access == GL_WRITE_ONLY_ARB);

	assert(intel_obj);

	if (intel_obj->sys_buffer) {
	obj->Pointer = intel_obj->sys_buffer;
	return obj->Pointer;
	}

	/* Flush any existing batchbuffer that might reference this data. */
	if (drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
	intelFlush(ctx);

	if (intel_obj->region)
	intel_bufferobj_cow(intel, intel_obj);

	if (intel_obj->buffer == NULL) {
	obj->Pointer = NULL;
	return NULL;
	}

	if (write_only && intel->intelScreen->kernel_exec_fencing) {
	drm_intel_gem_bo_map_gtt(intel_obj->buffer);
	intel_obj->mapped_gtt = GL_TRUE;
	} else {
	drm_intel_bo_map(intel_obj->buffer, !read_only);
	intel_obj->mapped_gtt = GL_FALSE;
	}

	obj->Pointer = intel_obj->buffer->virtual;
	obj->Length = obj->Size;
	obj->Offset = 0;

	return obj->Pointer;
	}

	/**
	* Called via glMapBufferRange().
	*
	* The goal of this extension is to allow apps to accumulate their rendering
	* at the same time as they accumulate their buffer object. Without it,
	* you'd end up blocking on execution of rendering every time you mapped
	* the buffer to put new data in.
	*
	* We support it in 3 ways: If unsynchronized, then don't bother
	* flushing the batchbuffer before mapping the buffer, which can save blocking
	* in many cases. If we would still block, and they allow the whole buffer
	* to be invalidated, then just allocate a new buffer to replace the old one.
	* If not, and we'd block, and they allow the subrange of the buffer to be
	* invalidated, then we can make a new little BO, let them write into that,
	* and blit it into the real BO at unmap time.
	*/
	static void *
	intel_bufferobj_map_range(GLcontext * ctx,
	GLenum target, GLintptr offset, GLsizeiptr length,
	GLbitfield access, struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

	assert(intel_obj);

	/* _mesa_MapBufferRange (GL entrypoint) sets these, but the vbo module also
	* internally uses our functions directly.
	*/
	obj->Offset = offset;
	obj->Length = length;
	obj->AccessFlags = access;

	if (intel_obj->sys_buffer) {
	obj->Pointer = intel_obj->sys_buffer + offset;
	return obj->Pointer;
	}

	if (intel_obj->region)
	intel_bufferobj_cow(intel, intel_obj);

	/* If the mapping is synchronized with other GL operations, flush
	* the batchbuffer so that GEM knows about the buffer access for later
	* syncing.
	*/
	if (!(access & GL_MAP_UNSYNCHRONIZED_BIT) &&
	drm_intel_bo_references(intel->batch->buf, intel_obj->buffer))
	intelFlush(ctx);

	if (intel_obj->buffer == NULL) {
	obj->Pointer = NULL;
	return NULL;
	}

	/* If the user doesn't care about existing buffer contents and mapping
	* would cause us to block, then throw out the old buffer.
	*/
	if (!(access & GL_MAP_UNSYNCHRONIZED_BIT) &&
	(access & GL_MAP_INVALIDATE_BUFFER_BIT) &&
	drm_intel_bo_busy(intel_obj->buffer)) {
	drm_intel_bo_unreference(intel_obj->buffer);
	intel_obj->buffer = dri_bo_alloc(intel->bufmgr, "bufferobj",
	intel_obj->Base.Size, 64);
	}

	/* If the user is mapping a range of an active buffer object but
	* doesn't require the current contents of that range, make a new
	* BO, and we'll copy what they put in there out at unmap or
	* FlushRange time.
	*/
	if ((access & GL_MAP_INVALIDATE_RANGE_BIT) &&
	drm_intel_bo_busy(intel_obj->buffer)) {
	if (access & GL_MAP_FLUSH_EXPLICIT_BIT) {
	intel_obj->range_map_buffer = _mesa_malloc(length);
	obj->Pointer = intel_obj->range_map_buffer;
	} else {
	intel_obj->range_map_bo = drm_intel_bo_alloc(intel->bufmgr,
	"range map",
	length, 64);
	if (!(access & GL_MAP_READ_BIT) &&
	intel->intelScreen->kernel_exec_fencing) {
	drm_intel_gem_bo_map_gtt(intel_obj->range_map_bo);
	intel_obj->mapped_gtt = GL_TRUE;
	} else {
	drm_intel_bo_map(intel_obj->range_map_bo,
	(access & GL_MAP_WRITE_BIT) != 0);
	intel_obj->mapped_gtt = GL_FALSE;
	}
	obj->Pointer = intel_obj->range_map_bo->virtual;
	}
	return obj->Pointer;
	}

	if (!(access & GL_MAP_READ_BIT) &&
	intel->intelScreen->kernel_exec_fencing) {
	drm_intel_gem_bo_map_gtt(intel_obj->buffer);
	intel_obj->mapped_gtt = GL_TRUE;
	} else {
	drm_intel_bo_map(intel_obj->buffer, (access & GL_MAP_WRITE_BIT) != 0);
	intel_obj->mapped_gtt = GL_FALSE;
	}

	obj->Pointer = intel_obj->buffer->virtual + offset;
	return obj->Pointer;
	}

	/* Ideally we'd use a BO to avoid taking up cache space for the temporary
	* data, but FlushMappedBufferRange may be followed by further writes to
	* the pointer, so we would have to re-map after emitting our blit, which
	* would defeat the point.
	*/
	static void
	intel_bufferobj_flush_mapped_range(GLcontext *ctx, GLenum target,
	GLintptr offset, GLsizeiptr length,
	struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
	drm_intel_bo *temp_bo;

	/* Unless we're in the range map using a temporary system buffer,
	* there's no work to do.
	*/
	if (intel_obj->range_map_buffer == NULL)
	return;

	temp_bo = drm_intel_bo_alloc(intel->bufmgr, "range map flush", length, 64);

	drm_intel_bo_subdata(temp_bo, 0, length, intel_obj->range_map_buffer);

	intel_emit_linear_blit(intel,
	intel_obj->buffer, obj->Offset + offset,
	temp_bo, 0,
	length);

	drm_intel_bo_unreference(temp_bo);
	}


	/**
	* Called via glUnmapBuffer().
	*/
	static GLboolean
	intel_bufferobj_unmap(GLcontext * ctx,
	GLenum target, struct gl_buffer_object *obj)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_obj = intel_buffer_object(obj);

	assert(intel_obj);
	assert(obj->Pointer);
	if (intel_obj->sys_buffer != NULL) {
	/* always keep the mapping around. */
	} else if (intel_obj->range_map_buffer != NULL) {
	/* Since we've emitted some blits to buffers that will (likely) be used
	* in rendering operations in other cache domains in this batch, emit a
	* flush. Once again, we wish for a domain tracker in libdrm to cover
	* usage inside of a batchbuffer.
	*/
	intel_batchbuffer_emit_mi_flush(intel->batch);
	free(intel_obj->range_map_buffer);
	intel_obj->range_map_buffer = NULL;
	} else if (intel_obj->range_map_bo != NULL) {
	if (intel_obj->mapped_gtt) {
	drm_intel_gem_bo_unmap_gtt(intel_obj->range_map_bo);
	} else {
	drm_intel_bo_unmap(intel_obj->range_map_bo);
	}

	intel_emit_linear_blit(intel,
	intel_obj->buffer, obj->Offset,
	intel_obj->range_map_bo, 0,
	obj->Length);

	/* Since we've emitted some blits to buffers that will (likely) be used
	* in rendering operations in other cache domains in this batch, emit a
	* flush. Once again, we wish for a domain tracker in libdrm to cover
	* usage inside of a batchbuffer.
	*/
	intel_batchbuffer_emit_mi_flush(intel->batch);

	drm_intel_bo_unreference(intel_obj->range_map_bo);
	intel_obj->range_map_bo = NULL;
	} else if (intel_obj->buffer != NULL) {
	if (intel_obj->mapped_gtt) {
	drm_intel_gem_bo_unmap_gtt(intel_obj->buffer);
	} else {
	drm_intel_bo_unmap(intel_obj->buffer);
	}
	}
	obj->Pointer = NULL;
	obj->Offset = 0;
	obj->Length = 0;

	return GL_TRUE;
	}

	dri_bo *
	intel_bufferobj_buffer(struct intel_context *intel,
	struct intel_buffer_object *intel_obj, GLuint flag)
	{
	if (intel_obj->region) {
	if (flag == INTEL_WRITE_PART)
	intel_bufferobj_cow(intel, intel_obj);
	else if (flag == INTEL_WRITE_FULL) {
	intel_bufferobj_release_region(intel, intel_obj);
	intel_bufferobj_alloc_buffer(intel, intel_obj);
	}
	}

	if (intel_obj->buffer == NULL) {
	void *sys_buffer = intel_obj->sys_buffer;

	/* only one of buffer and sys_buffer could be non-NULL */
	intel_bufferobj_alloc_buffer(intel, intel_obj);
	intel_obj->sys_buffer = NULL;

	intel_bufferobj_subdata(&intel->ctx,
	GL_ARRAY_BUFFER_ARB,
	0,
	intel_obj->Base.Size,
	sys_buffer,
	&intel_obj->Base);
	_mesa_free(sys_buffer);
	intel_obj->sys_buffer = NULL;
	}

	return intel_obj->buffer;
	}

	static void
	intel_bufferobj_copy_subdata(GLcontext *ctx,
	struct gl_buffer_object *src,
	struct gl_buffer_object *dst,
	GLintptr read_offset, GLintptr write_offset,
	GLsizeiptr size)
	{
	struct intel_context *intel = intel_context(ctx);
	struct intel_buffer_object *intel_src = intel_buffer_object(src);
	struct intel_buffer_object *intel_dst = intel_buffer_object(dst);
	drm_intel_bo src_bo, dst_bo;

	if (size == 0)
	return;

	/* If we're in system memory, just map and memcpy. */
	if (intel_src->sys_buffer \|\| intel_dst->sys_buffer) {
	/* The same buffer may be used, but note that regions copied may
	* not overlap.
	*/
	if (src == dst) {
	char *ptr = intel_bufferobj_map(ctx, GL_COPY_WRITE_BUFFER,
	GL_READ_WRITE, dst);
	memcpy(ptr + write_offset, ptr + read_offset, size);
	intel_bufferobj_unmap(ctx, GL_COPY_WRITE_BUFFER, dst);
	} else {
	const char *src_ptr;
	char *dst_ptr;

	src_ptr = intel_bufferobj_map(ctx, GL_COPY_READ_BUFFER,
	GL_READ_ONLY, src);
	dst_ptr = intel_bufferobj_map(ctx, GL_COPY_WRITE_BUFFER,
	GL_WRITE_ONLY, dst);

	memcpy(dst_ptr + write_offset, src_ptr + read_offset, size);

	intel_bufferobj_unmap(ctx, GL_COPY_READ_BUFFER, src);
	intel_bufferobj_unmap(ctx, GL_COPY_WRITE_BUFFER, dst);
	}
	}

	/* Otherwise, we have real BOs, so blit them. */

	dst_bo = intel_bufferobj_buffer(intel, intel_dst, INTEL_WRITE_PART);
	src_bo = intel_bufferobj_buffer(intel, intel_src, INTEL_READ);

	intel_emit_linear_blit(intel,
	dst_bo, write_offset,
	src_bo, read_offset, size);

	/* Since we've emitted some blits to buffers that will (likely) be used
	* in rendering operations in other cache domains in this batch, emit a
	* flush. Once again, we wish for a domain tracker in libdrm to cover
	* usage inside of a batchbuffer.
	*/
	intel_batchbuffer_emit_mi_flush(intel->batch);
	}

	void
	intelInitBufferObjectFuncs(struct dd_function_table *functions)
	{
	functions->NewBufferObject = intel_bufferobj_alloc;
	functions->DeleteBuffer = intel_bufferobj_free;
	functions->BufferData = intel_bufferobj_data;
	functions->BufferSubData = intel_bufferobj_subdata;
	functions->GetBufferSubData = intel_bufferobj_get_subdata;
	functions->MapBuffer = intel_bufferobj_map;
	functions->MapBufferRange = intel_bufferobj_map_range;
	functions->FlushMappedBufferRange = intel_bufferobj_flush_mapped_range;
	functions->UnmapBuffer = intel_bufferobj_unmap;
	functions->CopyBufferSubData = intel_bufferobj_copy_subdata;
	}