src/gallium/drivers/softpipe/sp_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_inlines.h"
  37 #include "util/u_prim.h"
  38
  39 #include "sp_context.h"
  40 #include "sp_query.h"
  41 #include "sp_state.h"
  42 #include "sp_texture.h"
  43
  44 #include "draw/draw_context.h"
  45
  46 /**
  47  * This function handles drawing indexed and non-indexed prims,
  48  * instanced and non-instanced drawing, with or without min/max element
  49  * indexes.
  50  * All the other drawing functions are expressed in terms of this
  51  * function.
  52  *
  53  * For non-indexed prims, indexBuffer should be NULL.
  54  * For non-instanced drawing, instanceCount should be 1.
  55  * When the min/max element indexes aren't known, minIndex should be 0
  56  * and maxIndex should be ~0.
  57  */
  58 void
  59 softpipe_draw_vbo(struct pipe_context *pipe,
  60                   const struct pipe_draw_info *info)
  61 {
  62    struct softpipe_context *sp = softpipe_context(pipe);
  63    struct draw_context *draw = sp->draw;
  64    const void *mapped_indices = NULL;
  65    unsigned i;
  66
  67    if (!softpipe_check_render_cond(sp))
  68       return;
  69
  70    sp->reduced_api_prim = u_reduced_prim(info->mode);
  71
  72    if (sp->dirty) {
  73       softpipe_update_derived(sp, sp->reduced_api_prim);
  74    }
  75
  76    /* Map vertex buffers */
  77    for (i = 0; i < sp->num_vertex_buffers; i++) {
  78       const void *buf = sp->vertex_buffer[i].user_buffer;
  79       size_t size = ~0;
  80       if (!buf) {
  81          if (!sp->vertex_buffer[i].buffer) {
  82             continue;
  83          }
  84          buf = softpipe_resource(sp->vertex_buffer[i].buffer)->data;
  85          size = sp->vertex_buffer[i].buffer->width0;
  86       }
  87       draw_set_mapped_vertex_buffer(draw, i, buf, size);
  88    }
  89
  90    /* Map index buffer, if present */
  91    if (info->indexed) {
  92       unsigned available_space = ~0;
  93       mapped_indices = sp->index_buffer.user_buffer;
  94       if (!mapped_indices) {
  95          mapped_indices = softpipe_resource(sp->index_buffer.buffer)->data;
  96          if (sp->index_buffer.buffer->width0 > sp->index_buffer.offset)
  97             available_space =
  98                (sp->index_buffer.buffer->width0 - sp->index_buffer.offset);
  99          else
 100             available_space = 0;
 101       }
 102
 103       draw_set_indexes(draw,
 104                        (ubyte *) mapped_indices + sp->index_buffer.offset,
 105                        sp->index_buffer.index_size, available_space);
 106    }
 107
 108
 109    for (i = 0; i < sp->num_so_targets; i++) {
 110       void *buf = softpipe_resource(sp->so_targets[i]->target.buffer)->data;
 111       sp->so_targets[i]->mapping = buf;
 112    }
 113
 114    draw_set_mapped_so_targets(draw, sp->num_so_targets,
 115                               sp->so_targets);
 116
 117    if (sp->gs && !sp->gs->shader.tokens) {
 118       /* we have an empty geometry shader with stream output, so
 119          attach the stream output info to the current vertex shader */
 120       if (sp->vs) {
 121          draw_vs_attach_so(sp->vs->draw_data, &sp->gs->shader.stream_output);
 122       }
 123    }
 124    draw_collect_pipeline_statistics(draw,
 125                                     sp->active_statistics_queries > 0);
 126
 127    /* draw! */
 128    draw_vbo(draw, info);
 129
 130    /* unmap vertex/index buffers - will cause draw module to flush */
 131    for (i = 0; i < sp->num_vertex_buffers; i++) {
 132       draw_set_mapped_vertex_buffer(draw, i, NULL, 0);
 133    }
 134    if (mapped_indices) {
 135       draw_set_indexes(draw, NULL, 0, 0);
 136    }
 137
 138    draw_set_mapped_so_targets(draw, 0, NULL);
 139
 140    /*
 141     * TODO: Flush only when a user vertex/index buffer is present
 142     * (or even better, modify draw module to do this
 143     * internally when this condition is seen?)
 144     */
 145    draw_flush(draw);
 146
 147    /* Note: leave drawing surfaces mapped */
 148    sp->dirty_render_cache = TRUE;
 149 }