src/mesa/state_tracker/st_cb_bufferobjects.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 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 "st_context.h"
  34 #include "st_cb_bufferobjects.h"
  35
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_defines.h"
  38 #include "pipe/p_winsys.h"
  39 #include "pipe/p_inlines.h"
  40
  41
  42
  43 /* Pixel buffers and Vertex/index buffers are handled through these
  44  * mesa callbacks.  Framebuffer/Renderbuffer objects are
  45  * created/managed elsewhere.
  46  */
  47
  48
  49
  50 /**
  51  * There is some duplication between mesa's bufferobjects and our
  52  * bufmgr buffers.  Both have an integer handle and a hashtable to
  53  * lookup an opaque structure.  It would be nice if the handles and
  54  * internal structure where somehow shared.
  55  */
  56 static struct gl_buffer_object *
  57 st_bufferobj_alloc(GLcontext *ctx, GLuint name, GLenum target)
  58 {
  59    struct st_buffer_object *st_obj = CALLOC_STRUCT(st_buffer_object);
  60
  61    if (!st_obj)
  62       return NULL;
  63
  64    _mesa_initialize_buffer_object(&st_obj->Base, name, target);
  65
  66    return &st_obj->Base;
  67 }
  68
  69
  70
  71 /**
  72  * Deallocate/free a vertex/pixel buffer object.
  73  * Called via glDeleteBuffersARB().
  74  */
  75 static void
  76 st_bufferobj_free(GLcontext *ctx, struct gl_buffer_object *obj)
  77 {
  78    struct pipe_context *pipe = st_context(ctx)->pipe;
  79    struct st_buffer_object *st_obj = st_buffer_object(obj);
  80
  81    if (st_obj->buffer)
  82       pipe_buffer_reference(pipe->winsys, &st_obj->buffer, NULL);
  83
  84    free(st_obj);
  85 }
  86
  87
  88
  89 /**
  90  * Replace data in a subrange of buffer object.  If the data range
  91  * specified by size + offset extends beyond the end of the buffer or
  92  * if data is NULL, no copy is performed.
  93  * Called via glBufferSubDataARB().
  94  */
  95 static void
  96 st_bufferobj_subdata(GLcontext *ctx,
  97                      GLenum target,
  98                      GLintptrARB offset,
  99                      GLsizeiptrARB size,
 100                      const GLvoid * data, struct gl_buffer_object *obj)
 101 {
 102    struct pipe_context *pipe = st_context(ctx)->pipe;
 103    struct st_buffer_object *st_obj = st_buffer_object(obj);
 104    char *map;
 105
 106    if (offset >= st_obj->size || size > (st_obj->size - offset))
 107       return;
 108
 109    map = pipe->winsys->buffer_map(pipe->winsys, st_obj->buffer,
 110                                         PIPE_BUFFER_USAGE_CPU_WRITE);
 111    memcpy(map + offset, data, size);
 112    pipe->winsys->buffer_unmap(pipe->winsys, st_obj->buffer);
 113 }
 114
 115
 116 /**
 117  * Called via glGetBufferSubDataARB().
 118  */
 119 static void
 120 st_bufferobj_get_subdata(GLcontext *ctx,
 121                          GLenum target,
 122                          GLintptrARB offset,
 123                          GLsizeiptrARB size,
 124                          GLvoid * data, struct gl_buffer_object *obj)
 125 {
 126    struct pipe_context *pipe = st_context(ctx)->pipe;
 127    struct st_buffer_object *st_obj = st_buffer_object(obj);
 128    char *map;
 129
 130    if (offset >= st_obj->size || size > (st_obj->size - offset))
 131       return;
 132
 133    map = pipe->winsys->buffer_map(pipe->winsys, st_obj->buffer,
 134                                   PIPE_BUFFER_USAGE_CPU_READ);
 135    memcpy(data, map + offset, size);
 136    pipe->winsys->buffer_unmap(pipe->winsys, st_obj->buffer);
 137 }
 138
 139
 140 /**
 141  * Allocate space for and store data in a buffer object.  Any data that was
 142  * previously stored in the buffer object is lost.  If data is NULL,
 143  * memory will be allocated, but no copy will occur.
 144  * Called via glBufferDataARB().
 145  */
 146 static void
 147 st_bufferobj_data(GLcontext *ctx,
 148                   GLenum target,
 149                   GLsizeiptrARB size,
 150                   const GLvoid * data,
 151                   GLenum usage,
 152                   struct gl_buffer_object *obj)
 153 {
 154    struct st_context *st = st_context(ctx);
 155    struct pipe_context *pipe = st->pipe;
 156    struct st_buffer_object *st_obj = st_buffer_object(obj);
 157    unsigned buffer_usage;
 158
 159    st_obj->Base.Size = size;
 160    st_obj->Base.Usage = usage;
 161
 162    switch(target) {
 163    case GL_PIXEL_PACK_BUFFER_ARB:
 164    case GL_PIXEL_UNPACK_BUFFER_ARB:
 165       buffer_usage = PIPE_BUFFER_USAGE_PIXEL;
 166       break;
 167    case GL_ARRAY_BUFFER_ARB:
 168       buffer_usage = PIPE_BUFFER_USAGE_VERTEX;
 169       break;
 170    case GL_ELEMENT_ARRAY_BUFFER_ARB:
 171       buffer_usage = PIPE_BUFFER_USAGE_INDEX;
 172       break;
 173    default:
 174       buffer_usage = 0;
 175    }
 176
 177    pipe_buffer_reference( pipe->winsys, &st_obj->buffer, NULL );
 178
 179    st_obj->buffer = pipe->winsys->buffer_create( pipe->winsys, 32, buffer_usage,
 180                                                  size );
 181
 182    st_obj->size = size;
 183
 184    if (data)
 185       st_bufferobj_subdata(ctx, target, 0, size, data, obj);
 186 }
 187
 188
 189 /**
 190  * Called via glMapBufferARB().
 191  */
 192 static void *
 193 st_bufferobj_map(GLcontext *ctx, GLenum target, GLenum access,
 194                  struct gl_buffer_object *obj)
 195 {
 196    struct pipe_context *pipe = st_context(ctx)->pipe;
 197    struct st_buffer_object *st_obj = st_buffer_object(obj);
 198    GLuint flags;
 199
 200    switch (access) {
 201    case GL_WRITE_ONLY:
 202       flags = PIPE_BUFFER_USAGE_CPU_WRITE;
 203       break;
 204    case GL_READ_ONLY:
 205       flags = PIPE_BUFFER_USAGE_CPU_READ;
 206       break;
 207    case GL_READ_WRITE:
 208       /* fall-through */
 209    default:
 210       flags = PIPE_BUFFER_USAGE_CPU_READ | PIPE_BUFFER_USAGE_CPU_WRITE;
 211       break;
 212    }
 213
 214    obj->Pointer = pipe->winsys->buffer_map(pipe->winsys, st_obj->buffer, flags);
 215    return obj->Pointer;
 216 }
 217
 218
 219 /**
 220  * Called via glMapBufferARB().
 221  */
 222 static GLboolean
 223 st_bufferobj_unmap(GLcontext *ctx, GLenum target, struct gl_buffer_object *obj)
 224 {
 225    struct pipe_context *pipe = st_context(ctx)->pipe;
 226    struct st_buffer_object *st_obj = st_buffer_object(obj);
 227
 228    pipe->winsys->buffer_unmap(pipe->winsys, st_obj->buffer);
 229    obj->Pointer = NULL;
 230    return GL_TRUE;
 231 }
 232
 233
 234 void
 235 st_init_bufferobject_functions(struct dd_function_table *functions)
 236 {
 237    functions->NewBufferObject = st_bufferobj_alloc;
 238    functions->DeleteBuffer = st_bufferobj_free;
 239    functions->BufferData = st_bufferobj_data;
 240    functions->BufferSubData = st_bufferobj_subdata;
 241    functions->GetBufferSubData = st_bufferobj_get_subdata;
 242    functions->MapBuffer = st_bufferobj_map;
 243    functions->UnmapBuffer = st_bufferobj_unmap;
 244 }