src/mesa/drivers/dri/intel/intel_buffer_objects.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "main/imports.h"
  30 #include "main/mtypes.h"
  31 #include "main/bufferobj.h"
  32
  33 #include "intel_context.h"
  34 #include "intel_buffer_objects.h"
  35 #include "intel_batchbuffer.h"
  36 #include "intel_regions.h"
  37
  38
  39 /** Allocates a new dri_bo to store the data for the buffer object. */
  40 static void
  41 intel_bufferobj_alloc_buffer(struct intel_context *intel,
  42                              struct intel_buffer_object *intel_obj)
  43 {
  44    intel_obj->buffer = dri_bo_alloc(intel->bufmgr, "bufferobj",
  45                                     intel_obj->Base.Size, 64);
  46 }
  47
  48 /**
  49  * There is some duplication between mesa's bufferobjects and our
  50  * bufmgr buffers.  Both have an integer handle and a hashtable to
  51  * lookup an opaque structure.  It would be nice if the handles and
  52  * internal structure where somehow shared.
  53  */
  54 static struct gl_buffer_object *
  55 intel_bufferobj_alloc(GLcontext * ctx, GLuint name, GLenum target)
  56 {
  57    struct intel_buffer_object *obj = CALLOC_STRUCT(intel_buffer_object);
  58
  59    _mesa_initialize_buffer_object(&obj->Base, name, target);
  60
  61    obj->buffer = NULL;
  62
  63    return &obj->Base;
  64 }
  65
  66 /* Break the COW tie to the region.  The region gets to keep the data.
  67  */
  68 void
  69 intel_bufferobj_release_region(struct intel_context *intel,
  70                                struct intel_buffer_object *intel_obj)
  71 {
  72    assert(intel_obj->region->buffer == intel_obj->buffer);
  73    intel_obj->region->pbo = NULL;
  74    intel_obj->region = NULL;
  75
  76    dri_bo_unreference(intel_obj->buffer);
  77    intel_obj->buffer = NULL;
  78 }
  79
  80 /* Break the COW tie to the region.  Both the pbo and the region end
  81  * up with a copy of the data.
  82  */
  83 void
  84 intel_bufferobj_cow(struct intel_context *intel,
  85                     struct intel_buffer_object *intel_obj)
  86 {
  87    assert(intel_obj->region);
  88    intel_region_cow(intel, intel_obj->region);
  89 }
  90
  91
  92 /**
  93  * Deallocate/free a vertex/pixel buffer object.
  94  * Called via glDeleteBuffersARB().
  95  */
  96 static void
  97 intel_bufferobj_free(GLcontext * ctx, struct gl_buffer_object *obj)
  98 {
  99    struct intel_context *intel = intel_context(ctx);
 100    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 101
 102    assert(intel_obj);
 103    assert(!obj->Pointer); /* Mesa should have unmapped it */
 104
 105    if (intel_obj->region) {
 106       intel_bufferobj_release_region(intel, intel_obj);
 107    }
 108    else if (intel_obj->buffer) {
 109       dri_bo_unreference(intel_obj->buffer);
 110    }
 111
 112    _mesa_free(intel_obj);
 113 }
 114
 115
 116
 117 /**
 118  * Allocate space for and store data in a buffer object.  Any data that was
 119  * previously stored in the buffer object is lost.  If data is NULL,
 120  * memory will be allocated, but no copy will occur.
 121  * Called via glBufferDataARB().
 122  */
 123 static void
 124 intel_bufferobj_data(GLcontext * ctx,
 125                      GLenum target,
 126                      GLsizeiptrARB size,
 127                      const GLvoid * data,
 128                      GLenum usage, struct gl_buffer_object *obj)
 129 {
 130    struct intel_context *intel = intel_context(ctx);
 131    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 132
 133    intel_obj->Base.Size = size;
 134    intel_obj->Base.Usage = usage;
 135
 136    assert(!obj->Pointer); /* Mesa should have unmapped it */
 137
 138    if (intel_obj->region)
 139       intel_bufferobj_release_region(intel, intel_obj);
 140
 141    if (intel_obj->buffer != NULL) {
 142       dri_bo_unreference(intel_obj->buffer);
 143       intel_obj->buffer = NULL;
 144    }
 145    if (size != 0) {
 146       intel_bufferobj_alloc_buffer(intel, intel_obj);
 147
 148       if (data != NULL)
 149          dri_bo_subdata(intel_obj->buffer, 0, size, data);
 150    }
 151 }
 152
 153
 154 /**
 155  * Replace data in a subrange of buffer object.  If the data range
 156  * specified by size + offset extends beyond the end of the buffer or
 157  * if data is NULL, no copy is performed.
 158  * Called via glBufferSubDataARB().
 159  */
 160 static void
 161 intel_bufferobj_subdata(GLcontext * ctx,
 162                         GLenum target,
 163                         GLintptrARB offset,
 164                         GLsizeiptrARB size,
 165                         const GLvoid * data, struct gl_buffer_object *obj)
 166 {
 167    struct intel_context *intel = intel_context(ctx);
 168    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 169
 170    assert(intel_obj);
 171
 172    if (intel_obj->region)
 173       intel_bufferobj_cow(intel, intel_obj);
 174
 175    dri_bo_subdata(intel_obj->buffer, offset, size, data);
 176 }
 177
 178
 179 /**
 180  * Called via glGetBufferSubDataARB().
 181  */
 182 static void
 183 intel_bufferobj_get_subdata(GLcontext * ctx,
 184                             GLenum target,
 185                             GLintptrARB offset,
 186                             GLsizeiptrARB size,
 187                             GLvoid * data, struct gl_buffer_object *obj)
 188 {
 189    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 190
 191    assert(intel_obj);
 192    dri_bo_get_subdata(intel_obj->buffer, offset, size, data);
 193 }
 194
 195
 196
 197 /**
 198  * Called via glMapBufferARB().
 199  */
 200 static void *
 201 intel_bufferobj_map(GLcontext * ctx,
 202                     GLenum target,
 203                     GLenum access, struct gl_buffer_object *obj)
 204 {
 205    struct intel_context *intel = intel_context(ctx);
 206    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 207
 208    /* XXX: Translate access to flags arg below:
 209     */
 210    assert(intel_obj);
 211
 212    if (intel_obj->region)
 213       intel_bufferobj_cow(intel, intel_obj);
 214
 215    if (intel_obj->buffer == NULL) {
 216       obj->Pointer = NULL;
 217       return NULL;
 218    }
 219
 220    dri_bo_map(intel_obj->buffer, GL_TRUE);
 221    obj->Pointer = intel_obj->buffer->virtual;
 222    return obj->Pointer;
 223 }
 224
 225
 226 /**
 227  * Called via glMapBufferARB().
 228  */
 229 static GLboolean
 230 intel_bufferobj_unmap(GLcontext * ctx,
 231                       GLenum target, struct gl_buffer_object *obj)
 232 {
 233    struct intel_buffer_object *intel_obj = intel_buffer_object(obj);
 234
 235    assert(intel_obj);
 236    if (intel_obj->buffer != NULL) {
 237       assert(obj->Pointer);
 238       dri_bo_unmap(intel_obj->buffer);
 239       obj->Pointer = NULL;
 240    }
 241    return GL_TRUE;
 242 }
 243
 244 dri_bo *
 245 intel_bufferobj_buffer(struct intel_context *intel,
 246                        struct intel_buffer_object *intel_obj, GLuint flag)
 247 {
 248    if (intel_obj->region) {
 249       if (flag == INTEL_WRITE_PART)
 250          intel_bufferobj_cow(intel, intel_obj);
 251       else if (flag == INTEL_WRITE_FULL) {
 252          intel_bufferobj_release_region(intel, intel_obj);
 253          intel_bufferobj_alloc_buffer(intel, intel_obj);
 254       }
 255    }
 256
 257    return intel_obj->buffer;
 258 }
 259
 260 void
 261 intel_bufferobj_init(struct intel_context *intel)
 262 {
 263    GLcontext *ctx = &intel->ctx;
 264
 265    ctx->Driver.NewBufferObject = intel_bufferobj_alloc;
 266    ctx->Driver.DeleteBuffer = intel_bufferobj_free;
 267    ctx->Driver.BufferData = intel_bufferobj_data;
 268    ctx->Driver.BufferSubData = intel_bufferobj_subdata;
 269    ctx->Driver.GetBufferSubData = intel_bufferobj_get_subdata;
 270    ctx->Driver.MapBuffer = intel_bufferobj_map;
 271    ctx->Driver.UnmapBuffer = intel_bufferobj_unmap;
 272 }