st_cb_bufferobjects.c revision 5b04939b16eb6e13858b070315dee1d0fc09d94f 
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 */
55static struct gl_buffer_object *
56st_bufferobj_alloc(GLcontext *ctx, GLuint name, GLenum target)
57{
58   struct st_buffer_object *st_obj = ST_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 */
74static void
75st_bufferobj_free(GLcontext *ctx, struct gl_buffer_object *obj)
76{
77   struct st_buffer_object *st_obj = st_buffer_object(obj);
78
79   if (st_obj->buffer)
80      pipe_buffer_reference(&st_obj->buffer, NULL);
81
82   _mesa_free(st_obj);
83}
84
85
86
87/**
88 * Replace data in a subrange of buffer object.  If the data range
89 * specified by size + offset extends beyond the end of the buffer or
90 * if data is NULL, no copy is performed.
91 * Called via glBufferSubDataARB().
92 */
93static void
94st_bufferobj_subdata(GLcontext *ctx,
95		     GLenum target,
96		     GLintptrARB offset,
97		     GLsizeiptrARB size,
98		     const GLvoid * data, struct gl_buffer_object *obj)
99{
100   struct pipe_context *pipe = st_context(ctx)->pipe;
101   struct st_buffer_object *st_obj = st_buffer_object(obj);
102
103   if (offset >= st_obj->size || size > (st_obj->size - offset))
104      return;
105
106   pipe_buffer_write(pipe->screen, st_obj->buffer, offset, size, data);
107}
108
109
110/**
111 * Called via glGetBufferSubDataARB().
112 */
113static void
114st_bufferobj_get_subdata(GLcontext *ctx,
115                         GLenum target,
116                         GLintptrARB offset,
117                         GLsizeiptrARB size,
118                         GLvoid * data, struct gl_buffer_object *obj)
119{
120   struct pipe_context *pipe = st_context(ctx)->pipe;
121   struct st_buffer_object *st_obj = st_buffer_object(obj);
122
123   if (offset >= st_obj->size || size > (st_obj->size - offset))
124      return;
125
126   pipe_buffer_read(pipe->screen, st_obj->buffer, offset, size, data);
127}
128
129
130/**
131 * Allocate space for and store data in a buffer object.  Any data that was
132 * previously stored in the buffer object is lost.  If data is NULL,
133 * memory will be allocated, but no copy will occur.
134 * Called via glBufferDataARB().
135 */
136static void
137st_bufferobj_data(GLcontext *ctx,
138		  GLenum target,
139		  GLsizeiptrARB size,
140		  const GLvoid * data,
141		  GLenum usage,
142		  struct gl_buffer_object *obj)
143{
144   struct st_context *st = st_context(ctx);
145   struct pipe_context *pipe = st->pipe;
146   struct st_buffer_object *st_obj = st_buffer_object(obj);
147   unsigned buffer_usage;
148
149   st_obj->Base.Size = size;
150   st_obj->Base.Usage = usage;
151
152   switch(target) {
153   case GL_PIXEL_PACK_BUFFER_ARB:
154   case GL_PIXEL_UNPACK_BUFFER_ARB:
155      buffer_usage = PIPE_BUFFER_USAGE_PIXEL;
156      break;
157   case GL_ARRAY_BUFFER_ARB:
158      buffer_usage = PIPE_BUFFER_USAGE_VERTEX;
159      break;
160   case GL_ELEMENT_ARRAY_BUFFER_ARB:
161      buffer_usage = PIPE_BUFFER_USAGE_INDEX;
162      break;
163   default:
164      buffer_usage = 0;
165   }
166
167   pipe_buffer_reference( &st_obj->buffer, NULL );
168
169   st_obj->buffer = pipe_buffer_create( pipe->screen, 32, buffer_usage, size );
170
171   st_obj->size = size;
172
173   if (data)
174      st_bufferobj_subdata(ctx, target, 0, size, data, obj);
175}
176
177
178/**
179 * Called via glMapBufferARB().
180 */
181static void *
182st_bufferobj_map(GLcontext *ctx, GLenum target, GLenum access,
183                 struct gl_buffer_object *obj)
184{
185   struct pipe_context *pipe = st_context(ctx)->pipe;
186   struct st_buffer_object *st_obj = st_buffer_object(obj);
187   GLuint flags;
188
189   switch (access) {
190   case GL_WRITE_ONLY:
191      flags = PIPE_BUFFER_USAGE_CPU_WRITE;
192      break;
193   case GL_READ_ONLY:
194      flags = PIPE_BUFFER_USAGE_CPU_READ;
195      break;
196   case GL_READ_WRITE:
197      /* fall-through */
198   default:
199      flags = PIPE_BUFFER_USAGE_CPU_READ | PIPE_BUFFER_USAGE_CPU_WRITE;
200      break;
201   }
202
203   obj->Pointer = pipe_buffer_map(pipe->screen, st_obj->buffer, flags);
204   return obj->Pointer;
205}
206
207
208
209/**
210 * Called via glMapBufferRange().
211 */
212static void *
213st_bufferobj_map_range(GLcontext *ctx, GLenum target,
214                       GLintptr offset, GLsizeiptr length, GLbitfield access,
215                       struct gl_buffer_object *obj)
216{
217   struct pipe_context *pipe = st_context(ctx)->pipe;
218   struct st_buffer_object *st_obj = st_buffer_object(obj);
219   GLuint flags = 0;
220   char *map;
221
222   if (access & GL_MAP_WRITE_BIT)
223      flags |= PIPE_BUFFER_USAGE_CPU_WRITE;
224
225   if (access & GL_MAP_READ_BIT)
226      flags |= PIPE_BUFFER_USAGE_CPU_READ;
227
228   /* ... other flags ...
229    */
230
231   if (access & MESA_MAP_NOWAIT_BIT)
232      flags |= PIPE_BUFFER_USAGE_DONTBLOCK;
233
234   map = pipe_buffer_map_range(pipe->screen, st_obj->buffer, offset, length, flags);
235   /* this is expected to point to the buffer start, in order to calculate the
236    * vertices offsets
237    */
238   obj->Pointer = map ? map - offset : NULL;
239   return map;
240}
241
242
243static void
244st_bufferobj_flush_mapped_range(GLcontext *ctx, GLenum target,
245                                GLintptr offset, GLsizeiptr length,
246                                struct gl_buffer_object *obj)
247{
248   struct pipe_context *pipe = st_context(ctx)->pipe;
249   struct st_buffer_object *st_obj = st_buffer_object(obj);
250
251   pipe_buffer_flush_mapped_range(pipe->screen, st_obj->buffer, offset, length);
252}
253
254
255/**
256 * Called via glUnmapBufferARB().
257 */
258static GLboolean
259st_bufferobj_unmap(GLcontext *ctx, GLenum target, struct gl_buffer_object *obj)
260{
261   struct pipe_context *pipe = st_context(ctx)->pipe;
262   struct st_buffer_object *st_obj = st_buffer_object(obj);
263
264   pipe_buffer_unmap(pipe->screen, st_obj->buffer);
265   obj->Pointer = NULL;
266   return GL_TRUE;
267}
268
269
270void
271st_init_bufferobject_functions(struct dd_function_table *functions)
272{
273   functions->NewBufferObject = st_bufferobj_alloc;
274   functions->DeleteBuffer = st_bufferobj_free;
275   functions->BufferData = st_bufferobj_data;
276   functions->BufferSubData = st_bufferobj_subdata;
277   functions->GetBufferSubData = st_bufferobj_get_subdata;
278   functions->MapBuffer = st_bufferobj_map;
279   functions->MapBufferRange = st_bufferobj_map_range;
280   functions->FlushMappedBufferRange = st_bufferobj_flush_mapped_range;
281   functions->UnmapBuffer = st_bufferobj_unmap;
282}
283