src/gallium/drivers/svga/svga_draw_arrays.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 "svga_cmd.h"
  27
  28 #include "util/u_inlines.h"
  29 #include "util/u_prim.h"
  30 #include "indices/u_indices.h"
  31
  32 #include "svga_hw_reg.h"
  33 #include "svga_draw.h"
  34 #include "svga_draw_private.h"
  35 #include "svga_context.h"
  36 #include "svga_shader.h"
  37
  38
  39 #define DBG 0
  40
  41
  42 static enum pipe_error
  43 generate_indices(struct svga_hwtnl *hwtnl,
  44                  unsigned nr,
  45                  unsigned index_size,
  46                  u_generate_func generate, struct pipe_resource **out_buf)
  47 {
  48    struct pipe_context *pipe = &hwtnl->svga->pipe;
  49    struct pipe_transfer *transfer;
  50    unsigned size = index_size * nr;
  51    struct pipe_resource *dst = NULL;
  52    void *dst_map = NULL;
  53
  54    dst = pipe_buffer_create(pipe->screen, PIPE_BIND_INDEX_BUFFER,
  55                             PIPE_USAGE_IMMUTABLE, size);
  56    if (!dst)
  57       goto fail;
  58
  59    dst_map = pipe_buffer_map(pipe, dst, PIPE_TRANSFER_WRITE, &transfer);
  60    if (!dst_map)
  61       goto fail;
  62
  63    generate(0, nr, dst_map);
  64
  65    pipe_buffer_unmap(pipe, transfer);
  66
  67    *out_buf = dst;
  68    return PIPE_OK;
  69
  70 fail:
  71    if (dst_map)
  72       pipe_buffer_unmap(pipe, transfer);
  73
  74    if (dst)
  75       pipe->screen->resource_destroy(pipe->screen, dst);
  76
  77    return PIPE_ERROR_OUT_OF_MEMORY;
  78 }
  79
  80
  81 static boolean
  82 compare(unsigned cached_nr, unsigned nr, unsigned type)
  83 {
  84    if (type == U_GENERATE_REUSABLE)
  85       return cached_nr >= nr;
  86    else
  87       return cached_nr == nr;
  88 }
  89
  90
  91 static enum pipe_error
  92 retrieve_or_generate_indices(struct svga_hwtnl *hwtnl,
  93                              unsigned prim,
  94                              unsigned gen_type,
  95                              unsigned gen_nr,
  96                              unsigned gen_size,
  97                              u_generate_func generate,
  98                              struct pipe_resource **out_buf)
  99 {
 100    enum pipe_error ret = PIPE_OK;
 101    int i;
 102
 103    for (i = 0; i < IDX_CACHE_MAX; i++) {
 104       if (hwtnl->index_cache[prim][i].buffer != NULL &&
 105           hwtnl->index_cache[prim][i].generate == generate) {
 106          if (compare(hwtnl->index_cache[prim][i].gen_nr, gen_nr, gen_type)) {
 107             pipe_resource_reference(out_buf,
 108                                     hwtnl->index_cache[prim][i].buffer);
 109
 110             if (DBG)
 111                debug_printf("%s retrieve %d/%d\n", __FUNCTION__, i, gen_nr);
 112
 113             return PIPE_OK;
 114          }
 115          else if (gen_type == U_GENERATE_REUSABLE) {
 116             pipe_resource_reference(&hwtnl->index_cache[prim][i].buffer,
 117                                     NULL);
 118
 119             if (DBG)
 120                debug_printf("%s discard %d/%d\n", __FUNCTION__,
 121                             i, hwtnl->index_cache[prim][i].gen_nr);
 122
 123             break;
 124          }
 125       }
 126    }
 127
 128    if (i == IDX_CACHE_MAX) {
 129       unsigned smallest = 0;
 130       unsigned smallest_size = ~0;
 131
 132       for (i = 0; i < IDX_CACHE_MAX && smallest_size; i++) {
 133          if (hwtnl->index_cache[prim][i].buffer == NULL) {
 134             smallest = i;
 135             smallest_size = 0;
 136          }
 137          else if (hwtnl->index_cache[prim][i].gen_nr < smallest) {
 138             smallest = i;
 139             smallest_size = hwtnl->index_cache[prim][i].gen_nr;
 140          }
 141       }
 142
 143       assert(smallest != IDX_CACHE_MAX);
 144
 145       pipe_resource_reference(&hwtnl->index_cache[prim][smallest].buffer,
 146                               NULL);
 147
 148       if (DBG)
 149          debug_printf("%s discard smallest %d/%d\n", __FUNCTION__,
 150                       smallest, smallest_size);
 151
 152       i = smallest;
 153    }
 154
 155    ret = generate_indices(hwtnl, gen_nr, gen_size, generate, out_buf);
 156    if (ret != PIPE_OK)
 157       return ret;
 158
 159    hwtnl->index_cache[prim][i].generate = generate;
 160    hwtnl->index_cache[prim][i].gen_nr = gen_nr;
 161    pipe_resource_reference(&hwtnl->index_cache[prim][i].buffer, *out_buf);
 162
 163    if (DBG)
 164       debug_printf("%s cache %d/%d\n", __FUNCTION__,
 165                    i, hwtnl->index_cache[prim][i].gen_nr);
 166
 167    return PIPE_OK;
 168 }
 169
 170
 171 static enum pipe_error
 172 simple_draw_arrays(struct svga_hwtnl *hwtnl,
 173                    unsigned prim, unsigned start, unsigned count,
 174                    unsigned start_instance, unsigned instance_count)
 175 {
 176    SVGA3dPrimitiveRange range;
 177    unsigned hw_prim;
 178    unsigned hw_count;
 179
 180    hw_prim = svga_translate_prim(prim, count, &hw_count);
 181    if (hw_count == 0)
 182       return PIPE_ERROR_BAD_INPUT;
 183
 184    range.primType = hw_prim;
 185    range.primitiveCount = hw_count;
 186    range.indexArray.surfaceId = SVGA3D_INVALID_ID;
 187    range.indexArray.offset = 0;
 188    range.indexArray.stride = 0;
 189    range.indexWidth = 0;
 190    range.indexBias = start;
 191
 192    /* Min/max index should be calculated prior to applying bias, so we
 193     * end up with min_index = 0, max_index = count - 1 and everybody
 194     * looking at those numbers knows to adjust them by
 195     * range.indexBias.
 196     */
 197    return svga_hwtnl_prim(hwtnl, &range, count,
 198                           0, count - 1, NULL,
 199                           start_instance, instance_count);
 200 }
 201
 202
 203 enum pipe_error
 204 svga_hwtnl_draw_arrays(struct svga_hwtnl *hwtnl,
 205                        unsigned prim, unsigned start, unsigned count,
 206                        unsigned start_instance, unsigned instance_count)
 207 {
 208    unsigned gen_prim, gen_size, gen_nr;
 209    enum indices_mode gen_type;
 210    u_generate_func gen_func;
 211    enum pipe_error ret = PIPE_OK;
 212    unsigned api_pv = hwtnl->api_pv;
 213    struct svga_context *svga = hwtnl->svga;
 214
 215    if (svga->curr.rast->templ.flatshade &&
 216        svga->state.hw_draw.fs->constant_color_output) {
 217       /* The fragment color is a constant, not per-vertex so the whole
 218        * primitive will be the same color (except for possible blending).
 219        * We can ignore the current provoking vertex state and use whatever
 220        * the hardware wants.
 221        */
 222       api_pv = hwtnl->hw_pv;
 223
 224       if (hwtnl->api_fillmode == PIPE_POLYGON_MODE_FILL) {
 225          /* Do some simple primitive conversions to avoid index buffer
 226           * generation below.  Note that polygons and quads are not directly
 227           * supported by the svga device.  Also note, we can only do this
 228           * for flat/constant-colored rendering because of provoking vertex.
 229           */
 230          if (prim == PIPE_PRIM_POLYGON) {
 231             prim = PIPE_PRIM_TRIANGLE_FAN;
 232          }
 233          else if (prim == PIPE_PRIM_QUADS && count == 4) {
 234             prim = PIPE_PRIM_TRIANGLE_FAN;
 235          }
 236       }
 237    }
 238
 239    if (hwtnl->api_fillmode != PIPE_POLYGON_MODE_FILL &&
 240        u_reduced_prim(prim) == PIPE_PRIM_TRIANGLES) {
 241       /* Convert unfilled polygons into points, lines, triangles */
 242       gen_type = u_unfilled_generator(prim,
 243                                       start,
 244                                       count,
 245                                       hwtnl->api_fillmode,
 246                                       &gen_prim,
 247                                       &gen_size, &gen_nr, &gen_func);
 248    }
 249    else {
 250       /* Convert PIPE_PRIM_LINE_LOOP to PIPE_PRIM_LINESTRIP,
 251        * convert PIPE_PRIM_POLYGON to PIPE_PRIM_TRIANGLE_FAN,
 252        * etc, if needed (as determined by svga_hw_prims mask).
 253        */
 254       gen_type = u_index_generator(svga_hw_prims,
 255                                    prim,
 256                                    start,
 257                                    count,
 258                                    api_pv,
 259                                    hwtnl->hw_pv,
 260                                    &gen_prim, &gen_size, &gen_nr, &gen_func);
 261    }
 262
 263    if (gen_type == U_GENERATE_LINEAR) {
 264       return simple_draw_arrays(hwtnl, gen_prim, start, count,
 265                                 start_instance, instance_count);
 266    }
 267    else {
 268       struct pipe_resource *gen_buf = NULL;
 269
 270       /* Need to draw as indexed primitive.
 271        * Potentially need to run the gen func to build an index buffer.
 272        */
 273       ret = retrieve_or_generate_indices(hwtnl,
 274                                          prim,
 275                                          gen_type,
 276                                          gen_nr,
 277                                          gen_size, gen_func, &gen_buf);
 278       if (ret != PIPE_OK)
 279          goto done;
 280
 281       pipe_debug_message(&svga->debug.callback, PERF_INFO,
 282                          "generating temporary index buffer for drawing %s",
 283                          u_prim_name(prim));
 284
 285       ret = svga_hwtnl_simple_draw_range_elements(hwtnl,
 286                                                   gen_buf,
 287                                                   gen_size,
 288                                                   start,
 289                                                   0,
 290                                                   count - 1,
 291                                                   gen_prim, 0, gen_nr,
 292                                                   start_instance,
 293                                                   instance_count);
 294       if (ret != PIPE_OK)
 295          goto done;
 296
 297 done:
 298       if (gen_buf)
 299          pipe_resource_reference(&gen_buf, NULL);
 300
 301       return ret;
 302    }
 303 }