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      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_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, unsigned 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)
     77          continue;
     78 
     79       buffer = svga_buffer(vb->buffer);
     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)
     95          continue;
     96 
     97       buffer = svga_buffer(vb->buffer);
     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, unsigned 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 };
    161