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