src/gallium/drivers/svga/svga_state_vdecl.c

   1 /**********************************************************
   2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person
   5  * obtaining a copy of this software and associated documentation
   6  * files (the "Software"), to deal in the Software without
   7  * restriction, including without limitation the rights to use, copy,
   8  * modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  *
  24  **********************************************************/
  25
  26 #include "util/u_inlines.h"
  27 #include "pipe/p_defines.h"
  28 #include "util/u_math.h"
  29 #include "util/u_upload_mgr.h"
  30
  31 #include "svga_context.h"
  32 #include "svga_state.h"
  33 #include "svga_draw.h"
  34 #include "svga_tgsi.h"
  35 #include "svga_screen.h"
  36 #include "svga_resource_buffer.h"
  37
  38 #include "svga_hw_reg.h"
  39
  40
  41 /***********************************************************************
  42  */
  43
  44
  45 static int emit_hw_vs_vdecl( struct svga_context *svga,
  46                              unsigned dirty )
  47 {
  48    const struct pipe_vertex_element *ve = svga->curr.velems->velem;
  49    SVGA3dVertexDecl decl;
  50    unsigned i;
  51    unsigned neg_bias = 0;
  52
  53    assert(svga->curr.velems->count >=
  54           svga->curr.vs->base.info.file_count[TGSI_FILE_INPUT]);
  55
  56    svga_hwtnl_reset_vdecl( svga->hwtnl,
  57                            svga->curr.velems->count );
  58
  59    /**
  60     * We can't set the VDECL offset to something negative, so we
  61     * must calculate a common negative additional index bias, and modify
  62     * the VDECL offsets accordingly so they *all* end up positive.
  63     *
  64     * Note that the exact value of the negative index bias is not that
  65     * important, since we compensate for it when we calculate the vertex
  66     * buffer offset below. The important thing is that all vertex buffer
  67     * offsets remain positive.
  68     *
  69     * Note that we use a negative bias variable in order to make the
  70     * rounding maths more easy to follow, and to avoid int / unsigned
  71     * confusion.
  72     */
  73
  74    for (i = 0; i < svga->curr.velems->count; i++) {
  75       const struct pipe_vertex_buffer *vb =
  76          &svga->curr.vb[ve[i].vertex_buffer_index];
  77       struct svga_buffer *buffer;
  78       unsigned int offset = vb->buffer_offset + ve[i].src_offset;
  79       unsigned tmp_neg_bias = 0;
  80
  81       if (!vb->buffer)
  82          continue;
  83
  84       buffer = svga_buffer(vb->buffer);
  85       if (buffer->uploaded.start > offset) {
  86          tmp_neg_bias = buffer->uploaded.start - offset;
  87          if (vb->stride)
  88             tmp_neg_bias = (tmp_neg_bias + vb->stride - 1) / vb->stride;
  89          neg_bias = MAX2(neg_bias, tmp_neg_bias);
  90       }
  91    }
  92
  93    for (i = 0; i < svga->curr.velems->count; i++) {
  94       const struct pipe_vertex_buffer *vb =
  95          &svga->curr.vb[ve[i].vertex_buffer_index];
  96       unsigned usage, index;
  97       struct svga_buffer *buffer;
  98
  99       if (!vb->buffer)
 100          continue;
 101
 102       buffer= svga_buffer(vb->buffer);
 103       svga_generate_vdecl_semantics( i, &usage, &index );
 104
 105       /* SVGA_NEW_VELEMENT
 106        */
 107       decl.identity.type = svga->state.sw.ve_format[i];
 108       decl.identity.method = SVGA3D_DECLMETHOD_DEFAULT;
 109       decl.identity.usage = usage;
 110       decl.identity.usageIndex = index;
 111       decl.array.stride = vb->stride;
 112
 113       /* Compensate for partially uploaded vbo, and
 114        * for the negative index bias.
 115        */
 116       decl.array.offset = (vb->buffer_offset
 117                            + ve[i].src_offset
 118                            + neg_bias * vb->stride
 119                            - buffer->uploaded.start);
 120
 121       assert(decl.array.offset >= 0);
 122
 123       svga_hwtnl_vdecl( svga->hwtnl,
 124                         i,
 125                         &decl,
 126                         buffer->uploaded.buffer ? buffer->uploaded.buffer :
 127                         vb->buffer );
 128    }
 129
 130    svga_hwtnl_set_index_bias( svga->hwtnl, -neg_bias );
 131    return 0;
 132 }
 133
 134
 135 static int emit_hw_vdecl( struct svga_context *svga,
 136                           unsigned dirty )
 137 {
 138    /* SVGA_NEW_NEED_SWTNL
 139     */
 140    if (svga->state.sw.need_swtnl)
 141       return 0; /* Do not emit during swtnl */
 142
 143    return emit_hw_vs_vdecl( svga, dirty );
 144 }
 145
 146
 147 struct svga_tracked_state svga_hw_vdecl =
 148 {
 149    "hw vertex decl state (hwtnl version)",
 150    ( SVGA_NEW_NEED_SWTNL |
 151      SVGA_NEW_VELEMENT |
 152      SVGA_NEW_VBUFFER |
 153      SVGA_NEW_RAST |
 154      SVGA_NEW_FS |
 155      SVGA_NEW_VS ),
 156    emit_hw_vdecl
 157 };
 158
 159
 160
 161
 162
 163