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