src/gallium/drivers/svga/svga_draw_elements.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_inlines.h"
  27 #include "util/u_prim.h"
  28 #include "indices/u_indices.h"
  29
  30 #include "svga_cmd.h"
  31 #include "svga_draw.h"
  32 #include "svga_draw_private.h"
  33 #include "svga_resource_buffer.h"
  34 #include "svga_winsys.h"
  35 #include "svga_context.h"
  36 #include "svga_hw_reg.h"
  37
  38
  39 static enum pipe_error
  40 translate_indices(struct svga_hwtnl *hwtnl, struct pipe_resource *src,
  41                   unsigned offset, unsigned prim, unsigned nr,
  42                   unsigned index_size,
  43                   u_translate_func translate, struct pipe_resource **out_buf)
  44 {
  45    struct pipe_context *pipe = &hwtnl->svga->pipe;
  46    struct pipe_transfer *src_transfer = NULL;
  47    struct pipe_transfer *dst_transfer = NULL;
  48    unsigned size;
  49    const void *src_map = NULL;
  50    struct pipe_resource *dst = NULL;
  51    void *dst_map = NULL;
  52
  53    /* Need to trim vertex count to make sure we don't write too much data
  54     * to the dst buffer in the translate() call.
  55     */
  56    u_trim_pipe_prim(prim, &nr);
  57
  58    size = index_size * nr;
  59
  60    dst = pipe_buffer_create(pipe->screen,
  61                             PIPE_BIND_INDEX_BUFFER, PIPE_USAGE_DEFAULT, size);
  62    if (dst == NULL)
  63       goto fail;
  64
  65    src_map = pipe_buffer_map(pipe, src, PIPE_TRANSFER_READ, &src_transfer);
  66    if (src_map == NULL)
  67       goto fail;
  68
  69    dst_map = pipe_buffer_map(pipe, dst, PIPE_TRANSFER_WRITE, &dst_transfer);
  70    if (dst_map == NULL)
  71       goto fail;
  72
  73    translate((const char *) src_map + offset, 0, nr, dst_map);
  74
  75    pipe_buffer_unmap(pipe, src_transfer);
  76    pipe_buffer_unmap(pipe, dst_transfer);
  77
  78    *out_buf = dst;
  79    return PIPE_OK;
  80
  81  fail:
  82    if (src_map)
  83       pipe_buffer_unmap(pipe, src_transfer);
  84
  85    if (dst_map)
  86       pipe_buffer_unmap(pipe, dst_transfer);
  87
  88    if (dst)
  89       pipe->screen->resource_destroy(pipe->screen, dst);
  90
  91    return PIPE_ERROR_OUT_OF_MEMORY;
  92 }
  93
  94
  95 enum pipe_error
  96 svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
  97                                       struct pipe_resource *index_buffer,
  98                                       unsigned index_size, int index_bias,
  99                                       unsigned min_index, unsigned max_index,
 100                                       unsigned prim, unsigned start,
 101                                       unsigned count)
 102 {
 103    SVGA3dPrimitiveRange range;
 104    unsigned hw_prim;
 105    unsigned hw_count;
 106    unsigned index_offset = start * index_size;
 107
 108    hw_prim = svga_translate_prim(prim, count, &hw_count);
 109    if (hw_count == 0)
 110       return PIPE_OK; /* nothing to draw */
 111
 112    /* We should never see user-space buffers in the driver.  The vbuf
 113     * module should have converted them into real buffers.
 114     */
 115    if (index_buffer)
 116       assert(!svga_buffer_is_user_buffer(index_buffer));
 117
 118    range.primType = hw_prim;
 119    range.primitiveCount = hw_count;
 120    range.indexArray.offset = index_offset;
 121    range.indexArray.stride = index_size;
 122    range.indexWidth = index_size;
 123    range.indexBias = index_bias;
 124
 125    return svga_hwtnl_prim(hwtnl, &range, min_index, max_index, index_buffer);
 126 }
 127
 128
 129 enum pipe_error
 130 svga_hwtnl_draw_range_elements(struct svga_hwtnl *hwtnl,
 131                                struct pipe_resource *index_buffer,
 132                                unsigned index_size, int index_bias,
 133                                unsigned min_index, unsigned max_index,
 134                                unsigned prim, unsigned start, unsigned count)
 135 {
 136    unsigned gen_prim, gen_size, gen_nr, gen_type;
 137    u_translate_func gen_func;
 138    enum pipe_error ret = PIPE_OK;
 139
 140    if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&
 141        prim >= PIPE_PRIM_TRIANGLES) {
 142       gen_type = u_unfilled_translator(prim,
 143                                        index_size,
 144                                        count,
 145                                        hwtnl->api_fillmode,
 146                                        &gen_prim,
 147                                        &gen_size, &gen_nr, &gen_func);
 148    }
 149    else {
 150       gen_type = u_index_translator(svga_hw_prims,
 151                                     prim,
 152                                     index_size,
 153                                     count,
 154                                     hwtnl->api_pv,
 155                                     hwtnl->hw_pv,
 156                                     &gen_prim, &gen_size, &gen_nr, &gen_func);
 157    }
 158
 159    if (gen_type == U_TRANSLATE_MEMCPY) {
 160       /* No need for translation, just pass through to hardware:
 161        */
 162       return svga_hwtnl_simple_draw_range_elements(hwtnl, index_buffer,
 163                                                    index_size,
 164                                                    index_bias,
 165                                                    min_index,
 166                                                    max_index,
 167                                                    gen_prim, start, count);
 168    }
 169    else {
 170       struct pipe_resource *gen_buf = NULL;
 171
 172       /* Need to allocate a new index buffer and run the translate
 173        * func to populate it.  Could potentially cache this translated
 174        * index buffer with the original to avoid future
 175        * re-translations.  Not much point if we're just accelerating
 176        * GL though, as index buffers are typically used only once
 177        * there.
 178        */
 179       ret = translate_indices(hwtnl,
 180                               index_buffer,
 181                               start * index_size,
 182                               gen_prim, gen_nr, gen_size, gen_func, &gen_buf);
 183       if (ret != PIPE_OK)
 184          goto done;
 185
 186       ret = svga_hwtnl_simple_draw_range_elements(hwtnl,
 187                                                   gen_buf,
 188                                                   gen_size,
 189                                                   index_bias,
 190                                                   min_index,
 191                                                   max_index,
 192                                                   gen_prim, 0, gen_nr);
 193       if (ret != PIPE_OK)
 194          goto done;
 195
 196 done:
 197       if (gen_buf)
 198          pipe_resource_reference(&gen_buf, NULL);
 199
 200       return ret;
 201    }
 202 }