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.
  47  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  48  * the drawing to the 'draw' module.
  49  */
  50 static void
  51 llvmpipe_draw_range_elements(struct pipe_context *pipe,
  52                              struct pipe_resource *indexBuffer,
  53                              unsigned indexSize,
  54                              int indexBias,
  55                              unsigned min_index,
  56                              unsigned max_index,
  57                              unsigned mode, unsigned start, unsigned count)
  58 {
  59    struct llvmpipe_context *lp = llvmpipe_context(pipe);
  60    struct draw_context *draw = lp->draw;
  61    unsigned i;
  62
  63    if (lp->dirty)
  64       llvmpipe_update_derived( lp );
  65
  66    /*
  67     * Map vertex buffers
  68     */
  69    for (i = 0; i < lp->num_vertex_buffers; i++) {
  70       void *buf = llvmpipe_resource_data(lp->vertex_buffer[i].buffer);
  71       draw_set_mapped_vertex_buffer(draw, i, buf);
  72    }
  73
  74    /* Map index buffer, if present */
  75    if (indexBuffer) {
  76       void *mapped_indexes = llvmpipe_resource_data(indexBuffer);
  77       draw_set_mapped_element_buffer_range(draw, indexSize, indexBias,
  78                                            min_index,
  79                                            max_index,
  80                                            mapped_indexes);
  81    }
  82    else {
  83       /* no index/element buffer */
  84       draw_set_mapped_element_buffer_range(draw, 0, 0, start,
  85                                            start + count - 1, NULL);
  86    }
  87
  88    /* draw! */
  89    draw_arrays(draw, mode, start, 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 (indexBuffer) {
  98       draw_set_mapped_element_buffer(draw, 0, 0, NULL);
  99    }
 100
 101    /*
 102     * TODO: Flush only when a user vertex/index buffer is present
 103     * (or even better, modify draw module to do this
 104     * internally when this condition is seen?)
 105     */
 106    draw_flush(draw);
 107 }
 108
 109
 110 static void
 111 llvmpipe_draw_elements(struct pipe_context *pipe,
 112                        struct pipe_resource *indexBuffer,
 113                        unsigned indexSize,
 114                        int indexBias,
 115                        unsigned mode, unsigned start, unsigned count)
 116 {
 117    llvmpipe_draw_range_elements( pipe, indexBuffer,
 118                                  indexSize, indexBias,
 119                                  0, 0xffffffff,
 120                                  mode, start, count );
 121 }
 122
 123
 124 static void
 125 llvmpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
 126                      unsigned start, unsigned count)
 127 {
 128    llvmpipe_draw_elements(pipe, NULL, 0, 0, mode, start, count);
 129 }
 130
 131
 132 void
 133 llvmpipe_init_draw_funcs(struct llvmpipe_context *llvmpipe)
 134 {
 135    llvmpipe->pipe.draw_arrays = llvmpipe_draw_arrays;
 136    llvmpipe->pipe.draw_elements = llvmpipe_draw_elements;
 137    llvmpipe->pipe.draw_range_elements = llvmpipe_draw_range_elements;
 138 }