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
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  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_shader.h"
  37 #include "svga_resource_buffer.h"
  38 #include "svga_hw_reg.h"
  39
  40
  41
  42 static enum pipe_error
  43 emit_hw_vs_vdecl(struct svga_context *svga, uint64_t dirty)
  44 {
  45    const struct pipe_vertex_element *ve = svga->curr.velems->velem;
  46    SVGA3dVertexDecl decls[SVGA3D_INPUTREG_MAX];
  47    unsigned buffer_indexes[SVGA3D_INPUTREG_MAX];
  48    unsigned i;
  49    unsigned neg_bias = 0;
  50
  51    assert(svga->curr.velems->count >=
  52           svga->curr.vs->base.info.file_count[TGSI_FILE_INPUT]);
  53
  54    /**
  55     * We can't set the VDECL offset to something negative, so we
  56     * must calculate a common negative additional index bias, and modify
  57     * the VDECL offsets accordingly so they *all* end up positive.
  58     *
  59     * Note that the exact value of the negative index bias is not that
  60     * important, since we compensate for it when we calculate the vertex
  61     * buffer offset below. The important thing is that all vertex buffer
  62     * offsets remain positive.
  63     *
  64     * Note that we use a negative bias variable in order to make the
  65     * rounding maths more easy to follow, and to avoid int / unsigned
  66     * confusion.
  67     */
  68
  69    for (i = 0; i < svga->curr.velems->count; i++) {
  70       const struct pipe_vertex_buffer *vb =
  71          &svga->curr.vb[ve[i].vertex_buffer_index];
  72       struct svga_buffer *buffer;
  73       unsigned int offset = vb->buffer_offset + ve[i].src_offset;
  74       unsigned tmp_neg_bias = 0;
  75
  76       if (!vb->buffer.resource)
  77          continue;
  78
  79       buffer = svga_buffer(vb->buffer.resource);
  80       if (buffer->uploaded.start > offset) {
  81          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       struct svga_buffer *buffer;
  93
  94       if (!vb->buffer.resource)
  95          continue;
  96
  97       buffer = svga_buffer(vb->buffer.resource);
  98       svga_generate_vdecl_semantics( i, &usage, &index );
  99
 100       /* SVGA_NEW_VELEMENT
 101        */
 102       decls[i].identity.type = svga->curr.velems->decl_type[i];
 103       decls[i].identity.method = SVGA3D_DECLMETHOD_DEFAULT;
 104       decls[i].identity.usage = usage;
 105       decls[i].identity.usageIndex = index;
 106       decls[i].array.stride = vb->stride;
 107
 108       /* Compensate for partially uploaded vbo, and
 109        * for the negative index bias.
 110        */
 111       decls[i].array.offset = (vb->buffer_offset
 112                            + ve[i].src_offset
 113                            + neg_bias * vb->stride
 114                            - buffer->uploaded.start);
 115
 116       assert(decls[i].array.offset >= 0);
 117
 118       buffer_indexes[i] = ve[i].vertex_buffer_index;
 119
 120       assert(!buffer->uploaded.buffer);
 121    }
 122
 123    svga_hwtnl_vertex_decls(svga->hwtnl,
 124                            svga->curr.velems->count,
 125                            decls,
 126                            buffer_indexes,
 127                            svga->curr.velems->id);
 128
 129    svga_hwtnl_vertex_buffers(svga->hwtnl,
 130                              svga->curr.num_vertex_buffers,
 131                              svga->curr.vb);
 132
 133    svga_hwtnl_set_index_bias( svga->hwtnl, -(int) neg_bias );
 134    return PIPE_OK;
 135 }
 136
 137
 138 static enum pipe_error
 139 emit_hw_vdecl(struct svga_context *svga, uint64_t dirty)
 140 {
 141    /* SVGA_NEW_NEED_SWTNL
 142     */
 143    if (svga->state.sw.need_swtnl)
 144       return PIPE_OK; /* Do not emit during swtnl */
 145
 146    return emit_hw_vs_vdecl( svga, dirty );
 147 }
 148
 149
 150 struct svga_tracked_state svga_hw_vdecl =
 151 {
 152    "hw vertex decl state (hwtnl version)",
 153    ( SVGA_NEW_NEED_SWTNL |
 154      SVGA_NEW_VELEMENT |
 155      SVGA_NEW_VBUFFER |
 156      SVGA_NEW_RAST |
 157      SVGA_NEW_FS |
 158      SVGA_NEW_VS ),
 159    emit_hw_vdecl
 160 };