src/gallium/drivers/llvmpipe/lp_draw_arrays.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   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,
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  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 VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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  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_draw.h"
  37 #include "util/u_prim.h"
  38
  39 #include "lp_context.h"
  40 #include "lp_state.h"
  41 #include "lp_query.h"
  42
  43 #include "draw/draw_context.h"
  44
  45
  46
  47 /**
  48  * Draw vertex arrays, with optional indexing, optional instancing.
  49  * All the other drawing functions are implemented in terms of this function.
  50  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  51  * the drawing to the 'draw' module.
  52  */
  53 static void
  54 llvmpipe_draw_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
  55 {
  56    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  57    struct draw_context *draw = lp->draw;
  58    const void *mapped_indices = NULL;
  59    unsigned i;
  60
  61    if (!llvmpipe_check_render_cond(lp))
  62       return;
  63
  64    if (info->indirect) {
  65       util_draw_indirect(pipe, info);
  66       return;
  67    }
  68
  69    if (lp->dirty)
  70       llvmpipe_update_derived( lp );
  71
  72    /*
  73     * Map vertex buffers
  74     */
  75    for (i = 0; i < lp->num_vertex_buffers; i++) {
  76       const void *buf = lp->vertex_buffer[i].is_user_buffer ?
  77                            lp->vertex_buffer[i].buffer.user : NULL;
  78       size_t size = ~0;
  79       if (!buf) {
  80          if (!lp->vertex_buffer[i].buffer.resource) {
  81             continue;
  82          }
  83          buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer.resource);
  84          size = lp->vertex_buffer[i].buffer.resource->width0;
  85       }
  86       draw_set_mapped_vertex_buffer(draw, i, buf, size);
  87    }
  88
  89    /* Map index buffer, if present */
  90    if (info->index_size) {
  91       unsigned available_space = ~0;
  92       mapped_indices = info->has_user_indices ? info->index.user : NULL;
  93       if (!mapped_indices) {
  94          mapped_indices = llvmpipe_resource_data(info->index.resource);
  95          available_space = info->index.resource->width0;
  96       }
  97       draw_set_indexes(draw,
  98                        (ubyte *) mapped_indices,
  99                        info->index_size, available_space);
 100    }
 101
 102    for (i = 0; i < lp->num_so_targets; i++) {
 103       void *buf = 0;
 104       if (lp->so_targets[i]) {
 105          buf = llvmpipe_resource(lp->so_targets[i]->target.buffer)->data;
 106          lp->so_targets[i]->mapping = buf;
 107       }
 108    }
 109    draw_set_mapped_so_targets(draw, lp->num_so_targets,
 110                               lp->so_targets);
 111
 112    llvmpipe_prepare_vertex_sampling(lp,
 113                                     lp->num_sampler_views[PIPE_SHADER_VERTEX],
 114                                     lp->sampler_views[PIPE_SHADER_VERTEX]);
 115    llvmpipe_prepare_geometry_sampling(lp,
 116                                       lp->num_sampler_views[PIPE_SHADER_GEOMETRY],
 117                                       lp->sampler_views[PIPE_SHADER_GEOMETRY]);
 118    if (lp->gs && lp->gs->no_tokens) {
 119       /* we have an empty geometry shader with stream output, so
 120          attach the stream output info to the current vertex shader */
 121       if (lp->vs) {
 122          draw_vs_attach_so(lp->vs, &lp->gs->stream_output);
 123       }
 124    }
 125    draw_collect_pipeline_statistics(draw,
 126                                     lp->active_statistics_queries > 0);
 127
 128    /* draw! */
 129    draw_vbo(draw, info);
 130
 131    /*
 132     * unmap vertex/index buffers
 133     */
 134    for (i = 0; i < lp->num_vertex_buffers; i++) {
 135       draw_set_mapped_vertex_buffer(draw, i, NULL, 0);
 136    }
 137    if (mapped_indices) {
 138       draw_set_indexes(draw, NULL, 0, 0);
 139    }
 140    draw_set_mapped_so_targets(draw, 0, NULL);
 141
 142    if (lp->gs && lp->gs->no_tokens) {
 143       /* we have attached stream output to the vs for rendering,
 144          now lets reset it */
 145       if (lp->vs) {
 146          draw_vs_reset_so(lp->vs);
 147       }
 148    }
 149
 150    /*
 151     * TODO: Flush only when a user vertex/index buffer is present
 152     * (or even better, modify draw module to do this
 153     * internally when this condition is seen?)
 154     */
 155    draw_flush(draw);
 156 }
 157
 158
 159 void
 160 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
 161 {
 162    llvmpipe->pipe.draw_vbo = llvmpipe_draw_vbo;
 163 }