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_vbo(struct pipe_context *pipe, const struct pipe_draw_info *info)
  53 {
  54    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  55    struct draw_context *draw = lp->draw;
  56    void *mapped_indices = NULL;
  57    unsigned i;
  58
  59    if (lp->dirty)
  60       llvmpipe_update_derived( lp );
  61
  62    /*
  63     * Map vertex buffers
  64     */
  65    for (i = 0; i < lp->num_vertex_buffers; i++) {
  66       void *buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
  67       draw_set_mapped_vertex_buffer(draw, i, buf);
  68    }
  69
  70    /* Map index buffer, if present */
  71    if (info->indexed && lp->index_buffer.buffer) {
  72       mapped_indices = llvmpipe_resource_data(lp->index_buffer.buffer);
  73       mapped_indices += lp->index_buffer.offset;
  74    }
  75
  76    draw_set_mapped_element_buffer_range(draw, (mapped_indices) ?
  77                                         lp->index_buffer.index_size : 0,
  78                                         info->index_bias,
  79                                         info->min_index,
  80                                         info->max_index,
  81                                         mapped_indices);
  82
  83    llvmpipe_prepare_vertex_sampling(lp,
  84                                     lp->num_vertex_sampler_views,
  85                                     lp->vertex_sampler_views);
  86
  87    /* draw! */
  88    draw_arrays_instanced(draw, info->mode, info->start, info->count,
  89          info->start_instance, info->instance_count);
  90
  91    /*
  92     * unmap vertex/index buffers
  93     */
  94    for (i = 0; i < lp->num_vertex_buffers; i++) {
  95       draw_set_mapped_vertex_buffer(draw, i, NULL);
  96    }
  97    if (mapped_indices) {
  98       draw_set_mapped_element_buffer(draw, 0, 0, NULL);
  99    }
 100    llvmpipe_cleanup_vertex_sampling(lp);
 101
 102    /*
 103     * TODO: Flush only when a user vertex/index buffer is present
 104     * (or even better, modify draw module to do this
 105     * internally when this condition is seen?)
 106     */
 107    draw_flush(draw);
 108 }
 109
 110
 111 void
 112 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
 113 {
 114    llvmpipe->pipe.draw_vbo = llvmpipe_draw_vbo;
 115 }