src/gallium/winsys/egl_xlib/sw_winsys.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 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  * Totally software-based winsys layer.
  30  * Note that the one winsys function that we can't implement here
  31  * is flush_frontbuffer().
  32  * Whoever uses this code will have to provide that.
  33  *
  34  * Authors: Brian Paul
  35  */
  36
  37
  38 #include "pipe/internal/p_winsys_screen.h"
  39 #include "pipe/p_state.h"
  40 #include "pipe/p_inlines.h"
  41 #include "util/u_math.h"
  42 #include "util/u_memory.h"
  43
  44 #include "sw_winsys.h"
  45
  46
  47
  48 /** Subclass of pipe_winsys */
  49 struct sw_pipe_winsys
  50 {
  51    struct pipe_winsys Base;
  52    /* no extra fields for now */
  53 };
  54
  55
  56 /** subclass of pipe_buffer */
  57 struct sw_pipe_buffer
  58 {
  59    struct pipe_buffer Base;
  60    boolean UserBuffer;  /** Is this a user-space buffer? */
  61    void *Data;
  62    void *Mapped;
  63 };
  64
  65
  66 /** cast wrapper */
  67 static INLINE struct sw_pipe_buffer *
  68 sw_pipe_buffer(struct pipe_buffer *b)
  69 {
  70    return (struct sw_pipe_buffer *) b;
  71 }
  72
  73
  74 /**
  75  * Round n up to next multiple.
  76  */
  77 static INLINE unsigned
  78 round_up(unsigned n, unsigned multiple)
  79 {
  80    return (n + multiple - 1) & ~(multiple - 1);
  81 }
  82
  83
  84 static const char *
  85 get_name(struct pipe_winsys *pws)
  86 {
  87    return "software";
  88 }
  89
  90
  91 /** Create new pipe_buffer and allocate storage of given size */
  92 static struct pipe_buffer *
  93 buffer_create(struct pipe_winsys *pws,
  94               unsigned alignment,
  95               unsigned usage,
  96               unsigned size)
  97 {
  98    struct sw_pipe_buffer *buffer = CALLOC_STRUCT(sw_pipe_buffer);
  99    if (!buffer)
 100       return NULL;
 101
 102    pipe_reference_init(&buffer->Base.reference, 1);
 103    buffer->Base.alignment = alignment;
 104    buffer->Base.usage = usage;
 105    buffer->Base.size = size;
 106
 107    /* align to 16-byte multiple for Cell */
 108    buffer->Data = align_malloc(size, MAX2(alignment, 16));
 109
 110    return &buffer->Base;
 111 }
 112
 113
 114 /**
 115  * Create buffer which wraps user-space data.
 116  */
 117 static struct pipe_buffer *
 118 user_buffer_create(struct pipe_winsys *pws, void *ptr, unsigned bytes)
 119 {
 120    struct sw_pipe_buffer *buffer = CALLOC_STRUCT(sw_pipe_buffer);
 121    if (!buffer)
 122       return NULL;
 123
 124    pipe_reference_init(&buffer->Base.reference, 1);
 125    buffer->Base.size = bytes;
 126    buffer->UserBuffer = TRUE;
 127    buffer->Data = ptr;
 128
 129    return &buffer->Base;
 130 }
 131
 132
 133 static void *
 134 buffer_map(struct pipe_winsys *pws, struct pipe_buffer *buf, unsigned flags)
 135 {
 136    struct sw_pipe_buffer *buffer = sw_pipe_buffer(buf);
 137    buffer->Mapped = buffer->Data;
 138    return buffer->Mapped;
 139 }
 140
 141
 142 static void
 143 buffer_unmap(struct pipe_winsys *pws, struct pipe_buffer *buf)
 144 {
 145    struct sw_pipe_buffer *buffer = sw_pipe_buffer(buf);
 146    buffer->Mapped = NULL;
 147 }
 148
 149
 150 static void
 151 buffer_destroy(struct pipe_buffer *buf)
 152 {
 153    struct sw_pipe_buffer *buffer = sw_pipe_buffer(buf);
 154
 155    if (buffer->Data && !buffer->UserBuffer) {
 156       align_free(buffer->Data);
 157       buffer->Data = NULL;
 158    }
 159
 160    free(buffer);
 161 }
 162
 163
 164 static struct pipe_buffer *
 165 surface_buffer_create(struct pipe_winsys *winsys,
 166                       unsigned width, unsigned height,
 167                       enum pipe_format format,
 168                       unsigned usage,
 169                       unsigned tex_usage,
 170                       unsigned *stride)
 171 {
 172    const unsigned alignment = 64;
 173    struct pipe_format_block block;
 174    unsigned nblocksx, nblocksy;
 175
 176    pf_get_block(format, &block);
 177    nblocksx = pf_get_nblocksx(&block, width);
 178    nblocksy = pf_get_nblocksy(&block, height);
 179    *stride = round_up(nblocksx * block.size, alignment);
 180
 181    return winsys->buffer_create(winsys, alignment,
 182                                 usage,
 183                                 *stride * nblocksy);
 184 }
 185
 186
 187 static void
 188 fence_reference(struct pipe_winsys *sws, struct pipe_fence_handle **ptr,
 189                 struct pipe_fence_handle *fence)
 190 {
 191    /* no-op */
 192 }
 193
 194
 195 static int
 196 fence_signalled(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 197                 unsigned flag)
 198 {
 199    /* no-op */
 200    return 0;
 201 }
 202
 203
 204 static int
 205 fence_finish(struct pipe_winsys *sws, struct pipe_fence_handle *fence,
 206              unsigned flag)
 207 {
 208    /* no-op */
 209    return 0;
 210 }
 211
 212
 213 /**
 214  * Create/return a new pipe_winsys object.
 215  */
 216 struct pipe_winsys *
 217 create_sw_winsys(void)
 218 {
 219    struct sw_pipe_winsys *ws = CALLOC_STRUCT(sw_pipe_winsys);
 220    if (!ws)
 221       return NULL;
 222
 223    /* Fill in this struct with callbacks that pipe will need to
 224     * communicate with the window system, buffer manager, etc.
 225     */
 226    ws->Base.buffer_create = buffer_create;
 227    ws->Base.user_buffer_create = user_buffer_create;
 228    ws->Base.buffer_map = buffer_map;
 229    ws->Base.buffer_unmap = buffer_unmap;
 230    ws->Base.buffer_destroy = buffer_destroy;
 231
 232    ws->Base.surface_buffer_create = surface_buffer_create;
 233
 234    ws->Base.fence_reference = fence_reference;
 235    ws->Base.fence_signalled = fence_signalled;
 236    ws->Base.fence_finish = fence_finish;
 237
 238    ws->Base.flush_frontbuffer = NULL; /* not implemented here! */
 239
 240    ws->Base.get_name = get_name;
 241
 242    return &ws->Base;
 243 }