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 void
  46 llvmpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
  47                      unsigned start, unsigned count)
  48 {
  49    llvmpipe_draw_elements(pipe, NULL, 0, mode, start, count);
  50 }
  51
  52
  53 /**
  54  * Draw vertex arrays, with optional indexing.
  55  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  56  * the drawing to the 'draw' module.
  57  */
  58 void
  59 llvmpipe_draw_range_elements(struct pipe_context *pipe,
  60                              struct pipe_resource *indexBuffer,
  61                              unsigned indexSize,
  62                              unsigned min_index,
  63                              unsigned max_index,
  64                              unsigned mode, unsigned start, unsigned count)
  65 {
  66    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  67    struct draw_context *draw = lp->draw;
  68    unsigned i;
  69
  70    if (lp->dirty)
  71       llvmpipe_update_derived( lp );
  72
  73    /*
  74     * Map vertex buffers
  75     */
  76    for (i = 0; i < lp->num_vertex_buffers; i++) {
  77       void *buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
  78       draw_set_mapped_vertex_buffer(draw, i, buf);
  79    }
  80
  81    /* Map index buffer, if present */
  82    if (indexBuffer) {
  83       void *mapped_indexes = llvmpipe_resource_data(indexBuffer);
  84       draw_set_mapped_element_buffer_range(draw, indexSize,
  85                                            min_index,
  86                                            max_index,
  87                                            mapped_indexes);
  88    }
  89    else {
  90       /* no index/element buffer */
  91       draw_set_mapped_element_buffer_range(draw, 0, start,
  92                                            start + count - 1, NULL);
  93    }
  94
  95    /* draw! */
  96    draw_arrays(draw, mode, start, count);
  97
  98    /*
  99     * unmap vertex/index buffers
 100     */
 101    for (i = 0; i < lp->num_vertex_buffers; i++) {
 102       draw_set_mapped_vertex_buffer(draw, i, NULL);
 103    }
 104    if (indexBuffer) {
 105       draw_set_mapped_element_buffer(draw, 0, NULL);
 106    }
 107
 108    /*
 109     * TODO: Flush only when a user vertex/index buffer is present
 110     * (or even better, modify draw module to do this
 111     * internally when this condition is seen?)
 112     */
 113    draw_flush(draw);
 114 }
 115
 116
 117 void
 118 llvmpipe_draw_elements(struct pipe_context *pipe,
 119                        struct pipe_resource *indexBuffer,
 120                        unsigned indexSize,
 121                        unsigned mode, unsigned start, unsigned count)
 122 {
 123    llvmpipe_draw_range_elements( pipe, indexBuffer,
 124                                  indexSize,
 125                                  0, 0xffffffff,
 126                                  mode, start, count );
 127 }
 128