path: root/src/mesa/drivers/dri/intel/intel_buffer_objects.c

/**************************************************************************
 * 
 * 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 glBufferDataARB().
 */
static void
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;
	 }
      }
#endif
      intel_bufferobj_alloc_buffer(intel, intel_obj);

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


/**
 * 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
      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);
   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 have written to this
    * 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;
   return obj->Pointer;
}


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

   assert(intel_obj);
   if (intel_obj->sys_buffer != NULL) {
      assert(obj->Pointer);
      obj->Pointer = NULL;
   } else if (intel_obj->buffer != NULL) {
      assert(obj->Pointer);
      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;
   }
   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;
   GLuint pitch, height;

   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.  We don't have a memmove-type
    * blit like some other hardware, so we'll do a rectangular blit covering
    * a large space, then emit a scanline blit at the end to cover the last
    * if we need.
    */

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

   /* The pitch is a signed value. */
   pitch = MIN2(size, (1 << 15) - 1);
   height = size / pitch;
   intelEmitCopyBlit(intel, 1,
		     pitch, src_bo, read_offset, I915_TILING_NONE,
		     pitch, dst_bo, write_offset, I915_TILING_NONE,
		     0, 0, /* src x/y */
		     0, 0, /* dst x/y */
		     pitch, height, /* w, h */
		     GL_COPY);

   read_offset += pitch * height;
   write_offset += pitch * height;
   size -= pitch * height;
   assert (size < (1 << 15));
   if (size != 0) {
      intelEmitCopyBlit(intel, 1,
			size, src_bo, read_offset, I915_TILING_NONE,
			size, dst_bo, write_offset, I915_TILING_NONE,
			0, 0, /* src x/y */
			0, 0, /* dst x/y */
			size, 1, /* w, h */
			GL_COPY);
   }

   /* 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->UnmapBuffer = intel_bufferobj_unmap;
   functions->CopyBufferSubData = intel_bufferobj_copy_subdata;
}