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 #include "svga_hw_reg.h"
  38
  39
  40
  41 static enum pipe_error
  42 emit_hw_vs_vdecl(struct svga_context *svga, unsigned dirty)
  43 {
  44    const struct pipe_vertex_element *ve = svga->curr.velems->velem;
  45    unsigned i;
  46    unsigned neg_bias = 0;
  47
  48    assert(svga->curr.velems->count >=
  49           svga->curr.vs->base.info.file_count[TGSI_FILE_INPUT]);
  50
  51    /* specify number of vertex element declarations to come */
  52    svga_hwtnl_reset_vdecl( svga->hwtnl,
  53                            svga->curr.velems->count );
  54
  55    /**
  56     * We can't set the VDECL offset to something negative, so we
  57     * must calculate a common negative additional index bias, and modify
  58     * the VDECL offsets accordingly so they *all* end up positive.
  59     *
  60     * Note that the exact value of the negative index bias is not that
  61     * important, since we compensate for it when we calculate the vertex
  62     * buffer offset below. The important thing is that all vertex buffer
  63     * offsets remain positive.
  64     *
  65     * Note that we use a negative bias variable in order to make the
  66     * rounding maths more easy to follow, and to avoid int / unsigned
  67     * confusion.
  68     */
  69
  70    for (i = 0; i < svga->curr.velems->count; i++) {
  71       const struct pipe_vertex_buffer *vb =
  72          &svga->curr.vb[ve[i].vertex_buffer_index];
  73       const struct svga_buffer *buffer;
  74       unsigned int offset = vb->buffer_offset + ve[i].src_offset;
  75
  76       if (!vb->buffer)
  77          continue;
  78
  79       buffer = svga_buffer(vb->buffer);
  80       if (buffer->uploaded.start > offset) {
  81          unsigned tmp_neg_bias = buffer->uploaded.start - offset;
  82          if (vb->stride)
  83             tmp_neg_bias = (tmp_neg_bias + vb->stride - 1) / vb->stride;
  84          neg_bias = MAX2(neg_bias, tmp_neg_bias);
  85       }
  86    }
  87
  88    for (i = 0; i < svga->curr.velems->count; i++) {
  89       const struct pipe_vertex_buffer *vb =
  90          &svga->curr.vb[ve[i].vertex_buffer_index];
  91       unsigned usage, index;
  92       const struct svga_buffer *buffer;
  93       SVGA3dVertexDecl decl;
  94
  95       if (!vb->buffer)
  96          continue;
  97
  98       buffer = svga_buffer(vb->buffer);
  99       svga_generate_vdecl_semantics( i, &usage, &index );
 100
 101       /* SVGA_NEW_VELEMENT
 102        */
 103       decl.identity.type = svga->curr.velems->decl_type[i];
 104       decl.identity.method = SVGA3D_DECLMETHOD_DEFAULT;
 105       decl.identity.usage = usage;
 106       decl.identity.usageIndex = index;
 107       decl.array.stride = vb->stride;
 108
 109       /* Compensate for partially uploaded vbo, and
 110        * for the negative index bias.
 111        */
 112       decl.array.offset = (vb->buffer_offset
 113                            + ve[i].src_offset
 114                            + neg_bias * vb->stride
 115                            - buffer->uploaded.start);
 116
 117       assert(decl.array.offset >= 0);
 118
 119       svga_hwtnl_vdecl( svga->hwtnl,
 120                         i,
 121                         &decl,
 122                         buffer->uploaded.buffer ? buffer->uploaded.buffer :
 123                         vb->buffer );
 124    }
 125
 126    svga_hwtnl_set_index_bias( svga->hwtnl, -(int) neg_bias );
 127    return PIPE_OK;
 128 }
 129
 130
 131 static enum pipe_error
 132 emit_hw_vdecl(struct svga_context *svga, unsigned dirty)
 133 {
 134    /* SVGA_NEW_NEED_SWTNL
 135     */
 136    if (svga->state.sw.need_swtnl)
 137       return PIPE_OK; /* Do not emit during swtnl */
 138
 139    return emit_hw_vs_vdecl( svga, dirty );
 140 }
 141
 142
 143 struct svga_tracked_state svga_hw_vdecl =
 144 {
 145    "hw vertex decl state (hwtnl version)",
 146    ( SVGA_NEW_NEED_SWTNL |
 147      SVGA_NEW_VELEMENT |
 148      SVGA_NEW_VBUFFER |
 149      SVGA_NEW_RAST |
 150      SVGA_NEW_FS |
 151      SVGA_NEW_VS ),
 152    emit_hw_vdecl
 153 };