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 "pipe/p_winsys.h"
  37
  38 #include "sp_context.h"
  39 #include "sp_state.h"
  40
  41 #include "draw/draw_context.h"
  42
  43
  44
  45 static void
  46 softpipe_map_constant_buffers(struct softpipe_context *sp)
  47 {
  48    struct pipe_winsys *ws = sp->pipe.winsys;
  49    uint i;
  50    for (i = 0; i < 2; i++) {
  51       if (sp->constants[i].size)
  52          sp->mapped_constants[i] = ws->buffer_map(ws, sp->constants[i].buffer,
  53                                                   PIPE_BUFFER_USAGE_CPU_READ);
  54    }
  55
  56    draw_set_mapped_constant_buffer(sp->draw,
  57                                    sp->mapped_constants[PIPE_SHADER_VERTEX]);
  58 }
  59
  60 static void
  61 softpipe_unmap_constant_buffers(struct softpipe_context *sp)
  62 {
  63    struct pipe_winsys *ws = sp->pipe.winsys;
  64    uint i;
  65
  66    /* really need to flush all prims since the vert/frag shaders const buffers
  67     * are going away now.
  68     */
  69    draw_flush(sp->draw);
  70
  71    draw_set_mapped_constant_buffer(sp->draw, NULL);
  72
  73    for (i = 0; i < 2; i++) {
  74       if (sp->constants[i].size)
  75          ws->buffer_unmap(ws, sp->constants[i].buffer);
  76       sp->mapped_constants[i] = NULL;
  77    }
  78 }
  79
  80
  81 boolean
  82 softpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
  83                      unsigned start, unsigned count)
  84 {
  85    return softpipe_draw_elements(pipe, NULL, 0, mode, start, count);
  86 }
  87
  88
  89
  90 /**
  91  * Draw vertex arrays, with optional indexing.
  92  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  93  * the drawing to the 'draw' module.
  94  *
  95  * XXX should the element buffer be specified/bound with a separate function?
  96  */
  97 boolean
  98 softpipe_draw_elements(struct pipe_context *pipe,
  99                        struct pipe_buffer *indexBuffer,
 100                        unsigned indexSize,
 101                        unsigned mode, unsigned start, unsigned count)
 102 {
 103    struct softpipe_context *sp = softpipe_context(pipe);
 104    struct draw_context *draw = sp->draw;
 105    unsigned i;
 106
 107    /* first, check that the primitive is not malformed.  It is the
 108     * state tracker's responsibility to do send only correctly formed
 109     * primitives down.  It currently isn't doing that though...
 110     */
 111 #if 1
 112    count = draw_trim_prim( mode, count );
 113 #else
 114    if (!draw_validate_prim( mode, count ))
 115       assert(0);
 116 #endif
 117
 118
 119    if (sp->dirty)
 120       softpipe_update_derived( sp );
 121
 122    softpipe_map_surfaces(sp);
 123    softpipe_map_constant_buffers(sp);
 124
 125    /*
 126     * Map vertex buffers
 127     */
 128    for (i = 0; i < sp->num_vertex_buffers; i++) {
 129       void *buf
 130          = pipe->winsys->buffer_map(pipe->winsys,
 131                                     sp->vertex_buffer[i].buffer,
 132                                     PIPE_BUFFER_USAGE_CPU_READ);
 133       draw_set_mapped_vertex_buffer(draw, i, buf);
 134    }
 135    /* Map index buffer, if present */
 136    if (indexBuffer) {
 137       void *mapped_indexes
 138          = pipe->winsys->buffer_map(pipe->winsys, indexBuffer,
 139                                     PIPE_BUFFER_USAGE_CPU_READ);
 140       draw_set_mapped_element_buffer(draw, indexSize, mapped_indexes);
 141    }
 142    else {
 143       /* no index/element buffer */
 144       draw_set_mapped_element_buffer(draw, 0, NULL);
 145    }
 146
 147
 148    /* draw! */
 149    draw_arrays(draw, mode, start, count);
 150
 151    /*
 152     * unmap vertex/index buffers - will cause draw module to flush
 153     */
 154    for (i = 0; i < sp->num_vertex_buffers; i++) {
 155       draw_set_mapped_vertex_buffer(draw, i, NULL);
 156       pipe->winsys->buffer_unmap(pipe->winsys, sp->vertex_buffer[i].buffer);
 157    }
 158    if (indexBuffer) {
 159       draw_set_mapped_element_buffer(draw, 0, NULL);
 160       pipe->winsys->buffer_unmap(pipe->winsys, indexBuffer);
 161    }
 162
 163
 164    /* Note: leave drawing surfaces mapped */
 165    softpipe_unmap_constant_buffers(sp);
 166
 167    return TRUE;
 168 }