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].user_buffer;
  77       size_t size = ~0;
  78       if (!buf) {
  79          if (!lp->vertex_buffer[i].buffer) {
  80             continue;
  81          }
  82          buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
  83          size = lp->vertex_buffer[i].buffer->width0;
  84       }
  85       draw_set_mapped_vertex_buffer(draw, i, buf, size);
  86    }
  87
  88    /* Map index buffer, if present */
  89    if (info->indexed) {
  90       unsigned available_space = ~0;
  91       mapped_indices = lp->index_buffer.user_buffer;
  92       if (!mapped_indices) {
  93          mapped_indices = llvmpipe_resource_data(lp->index_buffer.buffer);
  94          if (lp->index_buffer.buffer->width0 > lp->index_buffer.offset)
  95             available_space =
  96                (lp->index_buffer.buffer->width0 - lp->index_buffer.offset);
  97          else
  98             available_space = 0;
  99       }
 100       draw_set_indexes(draw,
 101                        (ubyte *) mapped_indices + lp->index_buffer.offset,
 102                        lp->index_buffer.index_size, available_space);
 103    }
 104
 105    for (i = 0; i < lp->num_so_targets; i++) {
 106       void *buf = 0;
 107       if (lp->so_targets[i]) {
 108          buf = llvmpipe_resource(lp->so_targets[i]->target.buffer)->data;
 109          lp->so_targets[i]->mapping = buf;
 110       }
 111    }
 112    draw_set_mapped_so_targets(draw, lp->num_so_targets,
 113                               lp->so_targets);
 114
 115    llvmpipe_prepare_vertex_sampling(lp,
 116                                     lp->num_sampler_views[PIPE_SHADER_VERTEX],
 117                                     lp->sampler_views[PIPE_SHADER_VERTEX]);
 118    llvmpipe_prepare_geometry_sampling(lp,
 119                                       lp->num_sampler_views[PIPE_SHADER_GEOMETRY],
 120                                       lp->sampler_views[PIPE_SHADER_GEOMETRY]);
 121    if (lp->gs && lp->gs->no_tokens) {
 122       /* we have an empty geometry shader with stream output, so
 123          attach the stream output info to the current vertex shader */
 124       if (lp->vs) {
 125          draw_vs_attach_so(lp->vs, &lp->gs->stream_output);
 126       }
 127    }
 128    draw_collect_pipeline_statistics(draw,
 129                                     lp->active_statistics_queries > 0);
 130
 131    /* draw! */
 132    draw_vbo(draw, info);
 133
 134    /*
 135     * unmap vertex/index buffers
 136     */
 137    for (i = 0; i < lp->num_vertex_buffers; i++) {
 138       draw_set_mapped_vertex_buffer(draw, i, NULL, 0);
 139    }
 140    if (mapped_indices) {
 141       draw_set_indexes(draw, NULL, 0, 0);
 142    }
 143    draw_set_mapped_so_targets(draw, 0, NULL);
 144
 145    if (lp->gs && lp->gs->no_tokens) {
 146       /* we have attached stream output to the vs for rendering,
 147          now lets reset it */
 148       if (lp->vs) {
 149          draw_vs_reset_so(lp->vs);
 150       }
 151    }
 152
 153    llvmpipe_cleanup_vertex_sampling(lp);
 154    llvmpipe_cleanup_geometry_sampling(lp);
 155
 156    /*
 157     * TODO: Flush only when a user vertex/index buffer is present
 158     * (or even better, modify draw module to do this
 159     * internally when this condition is seen?)
 160     */
 161    draw_flush(draw);
 162 }
 163
 164
 165 void
 166 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
 167 {
 168    llvmpipe->pipe.draw_vbo = llvmpipe_draw_vbo;
 169 }