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    for (i = 0; i < 2; i++) {
  66       if (sp->constants[i].size)
  67          ws->buffer_unmap(ws, sp->constants[i].buffer);
  68       sp->mapped_constants[i] = NULL;
  69    }
  70 }
  71
  72
  73 boolean
  74 softpipe_draw_arrays(struct pipe_context *pipe, unsigned mode,
  75                      unsigned start, unsigned count)
  76 {
  77    return softpipe_draw_elements(pipe, NULL, 0, mode, start, count);
  78 }
  79
  80
  81
  82 /**
  83  * Draw vertex arrays, with optional indexing.
  84  * Basically, map the vertex buffers (and drawing surfaces), then hand off
  85  * the drawing to the 'draw' module.
  86  *
  87  * XXX should the element buffer be specified/bound with a separate function?
  88  */
  89 boolean
  90 softpipe_draw_elements(struct pipe_context *pipe,
  91                        struct pipe_buffer *indexBuffer,
  92                        unsigned indexSize,
  93                        unsigned mode, unsigned start, unsigned count)
  94 {
  95    struct softpipe_context *sp = softpipe_context(pipe);
  96    struct draw_context *draw = sp->draw;
  97    unsigned i;
  98
  99    /* first, check that the primitive is not malformed.  It is the
 100     * state tracker's responsibility to do send only correctly formed
 101     * primitives down.  It currently isn't doing that though...
 102     */
 103 #if 1
 104    count = draw_trim_prim( mode, count );
 105 #else
 106    if (!draw_validate_prim( mode, count ))
 107       assert(0);
 108 #endif
 109
 110
 111    if (sp->dirty)
 112       softpipe_update_derived( sp );
 113
 114    softpipe_map_surfaces(sp);
 115    softpipe_map_constant_buffers(sp);
 116
 117    /*
 118     * Map vertex buffers
 119     */
 120    for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
 121       if (sp->vertex_buffer[i].buffer) {
 122          void *buf
 123             = pipe->winsys->buffer_map(pipe->winsys,
 124                                        sp->vertex_buffer[i].buffer,
 125                                        PIPE_BUFFER_USAGE_CPU_READ);
 126          draw_set_mapped_vertex_buffer(draw, i, buf);
 127       }
 128    }
 129    /* Map index buffer, if present */
 130    if (indexBuffer) {
 131       void *mapped_indexes
 132          = pipe->winsys->buffer_map(pipe->winsys, indexBuffer,
 133                                     PIPE_BUFFER_USAGE_CPU_READ);
 134       draw_set_mapped_element_buffer(draw, indexSize, mapped_indexes);
 135    }
 136    else {
 137       /* no index/element buffer */
 138       draw_set_mapped_element_buffer(draw, 0, NULL);
 139    }
 140
 141
 142    /* draw! */
 143    draw_arrays(draw, mode, start, count);
 144
 145    /*
 146     * unmap vertex/index buffers - will cause draw module to flush
 147     */
 148    for (i = 0; i < PIPE_ATTRIB_MAX; i++) {
 149       if (sp->vertex_buffer[i].buffer) {
 150          draw_set_mapped_vertex_buffer(draw, i, NULL);
 151          pipe->winsys->buffer_unmap(pipe->winsys, sp->vertex_buffer[i].buffer);
 152       }
 153    }
 154    if (indexBuffer) {
 155       draw_set_mapped_element_buffer(draw, 0, NULL);
 156       pipe->winsys->buffer_unmap(pipe->winsys, indexBuffer);
 157    }
 158
 159
 160    /* Note: leave drawing surfaces mapped */
 161    softpipe_unmap_constant_buffers(sp);
 162
 163    return TRUE;
 164 }