src/gallium/drivers/i965/brw_swtnl.c

   1
   2 #include "brw_context.h"
   3 #include "brw_pipe_rast.h"
   4
   5
   6 static GLboolean need_swtnl( struct brw_context *brw )
   7 {
   8    const struct pipe_rasterizer_state *rast = &brw->curr.rast->templ;
   9
  10    /* If we don't require strict OpenGL conformance, never
  11     * use fallbacks.  If we're forcing fallbacks, always
  12     * use fallfacks.
  13     */
  14    if (brw->flags.no_swtnl)
  15       return FALSE;
  16
  17    if (brw->flags.force_swtnl)
  18       return TRUE;
  19
  20    /* Exceeding hw limits on number of VS inputs?
  21     */
  22    if (brw->curr.num_vertex_elements == 0 ||
  23        brw->curr.num_vertex_elements >= BRW_VEP_MAX) {
  24       return TRUE;
  25    }
  26
  27    /* Position array with zero stride?
  28     *
  29     * XXX: position isn't always at zero...
  30     * XXX: eliminate zero-stride arrays
  31     */
  32    {
  33       int ve0_vb = brw->curr.vertex_element[0].vertex_buffer_index;
  34
  35       if (brw->curr.vertex_buffer[ve0_vb].stride == 0)
  36          return TRUE;
  37    }
  38
  39    /* XXX: short-circuit
  40     */
  41    return FALSE;
  42
  43    if (brw->reduced_primitive == PIPE_PRIM_TRIANGLES) {
  44       if (rast->poly_smooth)
  45          return TRUE;
  46
  47    }
  48
  49    if (brw->reduced_primitive == PIPE_PRIM_LINES ||
  50        (brw->reduced_primitive == PIPE_PRIM_TRIANGLES &&
  51         (rast->fill_cw == PIPE_POLYGON_MODE_LINE ||
  52          rast->fill_ccw == PIPE_POLYGON_MODE_LINE)))
  53    {
  54       /* BRW hardware will do AA lines, but they are non-conformant it
  55        * seems.  TBD whether we keep this fallback:
  56        */
  57       if (rast->line_smooth)
  58          return TRUE;
  59
  60       /* XXX: was a fallback in mesa (gs doesn't get enough
  61        * information to know when to reset stipple counter), but there
  62        * must be a way around it.
  63        */
  64       if (rast->line_stipple_enable &&
  65           (brw->reduced_primitive == PIPE_PRIM_TRIANGLES ||
  66            brw->primitive == PIPE_PRIM_LINE_LOOP ||
  67            brw->primitive == PIPE_PRIM_LINE_STRIP))
  68          return TRUE;
  69    }
  70
  71
  72    if (brw->reduced_primitive == PIPE_PRIM_POINTS ||
  73        (brw->reduced_primitive == PIPE_PRIM_TRIANGLES &&
  74         (rast->fill_cw == PIPE_POLYGON_MODE_POINT ||
  75          rast->fill_ccw == PIPE_POLYGON_MODE_POINT)))
  76    {
  77       if (rast->point_smooth)
  78          return TRUE;
  79    }
  80
  81    /* BRW hardware doesn't handle CLAMP texturing correctly;
  82     * brw_wm_sampler_state:translate_wrap_mode() treats CLAMP
  83     * as CLAMP_TO_EDGE instead.  If we're using CLAMP, and
  84     * we want strict conformance, force the fallback.
  85     *
  86     * XXX: need a workaround for this.
  87     */
  88
  89    /* Nothing stopping us from the fast path now */
  90    return FALSE;
  91 }
  92
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  95