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 "util/u_upload_mgr.h"
  29 #include "indices/u_indices.h"
  30
  31 #include "svga_cmd.h"
  32 #include "svga_draw.h"
  33 #include "svga_draw_private.h"
  34 #include "svga_resource_buffer.h"
  35 #include "svga_winsys.h"
  36 #include "svga_context.h"
  37 #include "svga_hw_reg.h"
  38
  39
  40 static enum pipe_error
  41 translate_indices(struct svga_hwtnl *hwtnl, struct pipe_resource *src,
  42                   unsigned offset, unsigned prim, unsigned nr,
  43                   unsigned index_size,
  44                   u_translate_func translate, struct pipe_resource **out_buf)
  45 {
  46    struct pipe_context *pipe = &hwtnl->svga->pipe;
  47    struct pipe_transfer *src_transfer = NULL;
  48    struct pipe_transfer *dst_transfer = NULL;
  49    unsigned size = index_size * nr;
  50    const void *src_map = NULL;
  51    struct pipe_resource *dst = NULL;
  52    void *dst_map = NULL;
  53
  54    /* Need to trim vertex count to make sure we don't write too much data
  55     * to the dst buffer in the translate() call.
  56     */
  57    u_trim_pipe_prim(prim, &nr);
  58
  59    size = index_size * nr;
  60
  61    dst = pipe_buffer_create(pipe->screen,
  62                             PIPE_BIND_INDEX_BUFFER, PIPE_USAGE_DEFAULT, size);
  63    if (dst == NULL)
  64       goto fail;
  65
  66    src_map = pipe_buffer_map(pipe, src, PIPE_TRANSFER_READ, &src_transfer);
  67    if (src_map == NULL)
  68       goto fail;
  69
  70    dst_map = pipe_buffer_map(pipe, dst, PIPE_TRANSFER_WRITE, &dst_transfer);
  71    if (dst_map == NULL)
  72       goto fail;
  73
  74    translate((const char *) src_map + offset, 0, 0, nr, 0, dst_map);
  75
  76    pipe_buffer_unmap(pipe, src_transfer);
  77    pipe_buffer_unmap(pipe, dst_transfer);
  78
  79    *out_buf = dst;
  80    return PIPE_OK;
  81
  82  fail:
  83    if (src_map)
  84       pipe_buffer_unmap(pipe, src_transfer);
  85
  86    if (dst_map)
  87       pipe_buffer_unmap(pipe, dst_transfer);
  88
  89    if (dst)
  90       pipe->screen->resource_destroy(pipe->screen, dst);
  91
  92    return PIPE_ERROR_OUT_OF_MEMORY;
  93 }
  94
  95
  96 enum pipe_error
  97 svga_hwtnl_simple_draw_range_elements(struct svga_hwtnl *hwtnl,
  98                                       struct pipe_resource *index_buffer,
  99                                       unsigned index_size, int index_bias,
 100                                       unsigned min_index, unsigned max_index,
 101                                       unsigned prim, unsigned start,
 102                                       unsigned count,
 103                                       unsigned start_instance,
 104                                       unsigned instance_count)
 105 {
 106    SVGA3dPrimitiveRange range;
 107    unsigned hw_prim;
 108    unsigned hw_count;
 109    unsigned index_offset = start * index_size;
 110
 111    hw_prim = svga_translate_prim(prim, count, &hw_count);
 112    if (hw_count == 0)
 113       return PIPE_OK; /* nothing to draw */
 114
 115    range.primType = hw_prim;
 116    range.primitiveCount = hw_count;
 117    range.indexArray.offset = index_offset;
 118    range.indexArray.stride = index_size;
 119    range.indexWidth = index_size;
 120    range.indexBias = index_bias;
 121
 122    return svga_hwtnl_prim(hwtnl, &range, count,
 123                           min_index, max_index, index_buffer,
 124                           start_instance, instance_count);
 125 }
 126
 127
 128 enum pipe_error
 129 svga_hwtnl_draw_range_elements(struct svga_hwtnl *hwtnl,
 130                                struct pipe_resource *index_buffer,
 131                                unsigned index_size, int index_bias,
 132                                unsigned min_index, unsigned max_index,
 133                                unsigned prim, unsigned start, unsigned count,
 134                                unsigned start_instance, unsigned instance_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                                     PR_DISABLE,
 157                                     &gen_prim, &gen_size, &gen_nr, &gen_func);
 158    }
 159
 160    if (gen_type == U_TRANSLATE_MEMCPY) {
 161       /* No need for translation, just pass through to hardware:
 162        */
 163       return svga_hwtnl_simple_draw_range_elements(hwtnl, index_buffer,
 164                                                    index_size,
 165                                                    index_bias,
 166                                                    min_index,
 167                                                    max_index,
 168                                                    gen_prim, start, count,
 169                                                    start_instance,
 170                                                    instance_count);
 171    }
 172    else {
 173       struct pipe_resource *gen_buf = NULL;
 174
 175       /* Need to allocate a new index buffer and run the translate
 176        * func to populate it.  Could potentially cache this translated
 177        * index buffer with the original to avoid future
 178        * re-translations.  Not much point if we're just accelerating
 179        * GL though, as index buffers are typically used only once
 180        * there.
 181        */
 182       ret = translate_indices(hwtnl,
 183                               index_buffer,
 184                               start * index_size,
 185                               gen_prim, gen_nr, gen_size, gen_func, &gen_buf);
 186       if (ret != PIPE_OK)
 187          goto done;
 188
 189       ret = svga_hwtnl_simple_draw_range_elements(hwtnl,
 190                                                   gen_buf,
 191                                                   gen_size,
 192                                                   index_bias,
 193                                                   min_index,
 194                                                   max_index,
 195                                                   gen_prim, 0, gen_nr,
 196                                                   start_instance,
 197                                                   instance_count);
 198       if (ret != PIPE_OK)
 199          goto done;
 200
 201 done:
 202       if (gen_buf)
 203          pipe_resource_reference(&gen_buf, NULL);
 204
 205       return ret;
 206    }
 207 }