src/gallium/drivers/llvmpipe/lp_draw_arrays.c

   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 /* Author:
  29  *    Brian Paul
  30  *    Keith Whitwell
  31  */
  32
  33
  34 #include "pipe/p_defines.h"
  35 #include "pipe/p_context.h"
  36 #include "util/u_prim.h"
  37 #include "util/u_draw_quad.h"
  38
  39 #include "lp_context.h"
  40 #include "lp_state.h"
  41
  42 #include "draw/draw_context.h"
  43
  44
  45
  46 /**
  47  * Draw vertex arrays, with optional indexing, optional instancing.
  48  * All the other drawing functions are implemented in terms of this function.
  49  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  50  * the drawing to the 'draw' module.
  51  */
  52 static void
  53 llvmpipe_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
  54 {
  55    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  56    struct draw_context *draw = lp->draw;
  57    void *mapped_indices = NULL;
  58    unsigned i;
  59
  60    if (lp->dirty)
  61       llvmpipe_update_derived( lp );
  62
  63    /*
  64     * Map vertex buffers
  65     */
  66    for (i = 0; i < lp->num_vertex_buffers; i++) {
  67       void *buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
  68       draw_set_mapped_vertex_buffer(draw, i, buf);
  69    }
  70
  71    /* Map index buffer, if present */
  72    if (info->indexed && lp->index_buffer.buffer) {
  73       mapped_indices = llvmpipe_resource_data(lp->index_buffer.buffer);
  74       mapped_indices += lp->index_buffer.offset;
  75    }
  76
  77    draw_set_mapped_element_buffer_range(draw, (mapped_indices) ?
  78                                         lp->index_buffer.index_size : 0,
  79                                         info->index_bias,
  80                                         info->min_index,
  81                                         info->max_index,
  82                                         mapped_indices);
  83
  84    llvmpipe_prepare_vertex_sampling(lp,
  85                                     lp->num_vertex_sampler_views,
  86                                     lp->vertex_sampler_views);
  87
  88    /* draw! */
  89    draw_arrays_instanced(draw, info->mode, info->start, info->count,
  90          info->start_instance, info->instance_count);
  91
  92    /*
  93     * unmap vertex/index buffers
  94     */
  95    for (i = 0; i < lp->num_vertex_buffers; i++) {
  96       draw_set_mapped_vertex_buffer(draw, i, NULL);
  97    }
  98    if (mapped_indices) {
  99       draw_set_mapped_element_buffer(draw, 0, 0, NULL);
 100    }
 101    llvmpipe_cleanup_vertex_sampling(lp);
 102
 103    /*
 104     * TODO: Flush only when a user vertex/index buffer is present
 105     * (or even better, modify draw module to do this
 106     * internally when this condition is seen?)
 107     */
 108    draw_flush(draw);
 109 }
 110
 111
 112 static void
 113 llvmpipe_draw_range_elements_instanced(struct pipe_context *pipe,
 114                                        struct pipe_resource *indexBuffer,
 115                                        unsigned indexSize,
 116                                        int indexBias,
 117                                        unsigned minIndex,
 118                                        unsigned maxIndex,
 119                                        unsigned mode,
 120                                        unsigned start,
 121                                        unsigned count,
 122                                        unsigned startInstance,
 123                                        unsigned instanceCount)
 124 {
 125    struct llvmpipe_context *lp = llvmpipe_context(pipe);
 126    struct pipe_draw_info info;
 127    struct pipe_index_buffer saved_ib, ib;
 128
 129    util_draw_init_info(&info);
 130    info.mode = mode;
 131    info.start = start;
 132    info.count = count;
 133    info.start_instance = startInstance;
 134    info.instance_count = instanceCount;
 135
 136    info.index_bias = indexBias;
 137    info.min_index = minIndex;
 138    info.max_index = maxIndex;
 139
 140    if (indexBuffer) {
 141       info.indexed = TRUE;
 142       saved_ib = lp->index_buffer;
 143
 144       ib.buffer = indexBuffer;
 145       ib.offset = 0;
 146       ib.index_size = indexSize;
 147       pipe->set_index_buffer(pipe, &ib);
 148    }
 149
 150    llvmpipe_draw_vbo(pipe, &info);
 151
 152    if (indexBuffer)
 153       pipe->set_index_buffer(pipe, &saved_ib);
 154 }
 155
 156 static void
 157 llvmpipe_draw_arrays_instanced(struct pipe_context *pipe,
 158                                unsigned mode,
 159                                unsigned start,
 160                                unsigned count,
 161                                unsigned startInstance,
 162                                unsigned instanceCount)
 163 {
 164    llvmpipe_draw_range_elements_instanced(pipe,
 165                                           NULL, /* no indexBuffer */
 166                                           0, 0, /* indexSize, indexBias */
 167                                           0, ~0, /* minIndex, maxIndex */
 168                                           mode,
 169                                           start,
 170                                           count,
 171                                           startInstance,
 172                                           instanceCount);
 173 }
 174
 175
 176 static void
 177 llvmpipe_draw_elements_instanced(struct pipe_context *pipe,
 178                                  struct pipe_resource *indexBuffer,
 179                                  unsigned indexSize,
 180                                  int indexBias,
 181                                  unsigned mode,
 182                                  unsigned start,
 183                                  unsigned count,
 184                                  unsigned startInstance,
 185                                  unsigned instanceCount)
 186 {
 187    llvmpipe_draw_range_elements_instanced(pipe,
 188                                           indexBuffer,
 189                                           indexSize, indexBias,
 190                                           0, ~0, /* minIndex, maxIndex */
 191                                           mode,
 192                                           start,
 193                                           count,
 194                                           startInstance,
 195                                           instanceCount);
 196 }
 197
 198
 199 static void
 200 llvmpipe_draw_elements(struct pipe_context *pipe,
 201                        struct pipe_resource *indexBuffer,
 202                        unsigned indexSize,
 203                        int indexBias,
 204                        unsigned mode,
 205                        unsigned start,
 206                        unsigned count)
 207 {
 208    llvmpipe_draw_range_elements_instanced(pipe,
 209                                           indexBuffer,
 210                                           indexSize, indexBias,
 211                                           0, 0xffffffff,  /* min, maxIndex */
 212                                           mode, start, count,
 213                                           0,  /* startInstance */
 214                                           1);  /* instanceCount */
 215 }
 216
 217
 218 static void
 219 llvmpipe_draw_range_elements(struct pipe_context *pipe,
 220                              struct pipe_resource *indexBuffer,
 221                              unsigned indexSize,
 222                              int indexBias,
 223                              unsigned min_index,
 224                              unsigned max_index,
 225                              unsigned mode,
 226                              unsigned start,
 227                              unsigned count)
 228 {
 229    llvmpipe_draw_range_elements_instanced(pipe,
 230                                           indexBuffer,
 231                                           indexSize, indexBias,
 232                                           min_index, max_index,
 233                                           mode, start, count,
 234                                           0,  /* startInstance */
 235                                           1);  /* instanceCount */
 236 }
 237
 238
 239 static void
 240 llvmpipe_draw_arrays(struct pipe_context *pipe,
 241                      unsigned mode,
 242                      unsigned start,
 243                      unsigned count)
 244 {
 245    llvmpipe_draw_range_elements_instanced(pipe,
 246                                           NULL,  /* indexBuffer */
 247                                           0,  /* indexSize */
 248                                           0,  /* indexBias */
 249                                           0, ~0,  /* min, maxIndex */
 250                                           mode, start, count,
 251                                           0,  /* startInstance */
 252                                           1);  /* instanceCount */
 253 }
 254
 255
 256 void
 257 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
 258 {
 259    llvmpipe->pipe.draw_arrays = llvmpipe_draw_arrays;
 260    llvmpipe->pipe.draw_elements = llvmpipe_draw_elements;
 261    llvmpipe->pipe.draw_range_elements = llvmpipe_draw_range_elements;
 262    llvmpipe->pipe.draw_arrays_instanced = llvmpipe_draw_arrays_instanced;
 263    llvmpipe->pipe.draw_elements_instanced = llvmpipe_draw_elements_instanced;
 264
 265    llvmpipe->pipe.draw_vbo = llvmpipe_draw_vbo;
 266 }