src/gallium/drivers/svga/svga_pipe_rasterizer.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 "draw/draw_context.h"
  27 #include "pipe/p_inlines.h"
  28 #include "pipe/p_defines.h"
  29 #include "util/u_math.h"
  30 #include "util/u_memory.h"
  31
  32 #include "svga_context.h"
  33
  34 #include "svga_hw_reg.h"
  35
  36 /* Hardware frontwinding is always set up as SVGA3D_FRONTWINDING_CW.
  37  */
  38 static SVGA3dFace svga_translate_cullmode( unsigned mode,
  39                                            unsigned front_winding )
  40 {
  41    switch (mode) {
  42    case PIPE_WINDING_NONE:
  43       return SVGA3D_FACE_NONE;
  44    case PIPE_WINDING_CCW:
  45       return SVGA3D_FACE_BACK;
  46    case PIPE_WINDING_CW:
  47       return SVGA3D_FACE_FRONT;
  48    case PIPE_WINDING_BOTH:
  49       return SVGA3D_FACE_FRONT_BACK;
  50    default:
  51       assert(0);
  52       return SVGA3D_FACE_NONE;
  53    }
  54 }
  55
  56 static SVGA3dShadeMode svga_translate_flatshade( unsigned mode )
  57 {
  58    return mode ? SVGA3D_SHADEMODE_FLAT : SVGA3D_SHADEMODE_SMOOTH;
  59 }
  60
  61
  62 static void *
  63 svga_create_rasterizer_state(struct pipe_context *pipe,
  64                              const struct pipe_rasterizer_state *templ)
  65 {
  66    struct svga_rasterizer_state *rast = CALLOC_STRUCT( svga_rasterizer_state );
  67    /* need this for draw module. */
  68    rast->templ = *templ;
  69
  70    /* light_twoside          - XXX: need fragment shader varient */
  71    /* poly_smooth            - XXX: no fallback available */
  72    /* poly_stipple_enable    - draw module */
  73    /* point_sprite           - ? */
  74    /* point_size_per_vertex  - ? */
  75    /* sprite_coord_mode      - ??? */
  76    /* bypass_vs_viewport_and_clip        - handled by viewport setup */
  77    /* flatshade_first        - handled by index translation */
  78    /* gl_rasterization_rules - XXX - viewport code */
  79    /* line_width             - draw module */
  80    /* fill_cw, fill_ccw      - draw module or index translation */
  81
  82    rast->shademode = svga_translate_flatshade( templ->flatshade );
  83    rast->cullmode = svga_translate_cullmode( templ->cull_mode,
  84                                              templ->front_winding );
  85    rast->scissortestenable = templ->scissor;
  86    rast->multisampleantialias = templ->multisample;
  87    rast->antialiasedlineenable = templ->line_smooth;
  88    rast->lastpixel = templ->line_last_pixel;
  89    rast->pointsize = templ->point_size;
  90    rast->pointsize_min = templ->point_size_min;
  91    rast->pointsize_max = templ->point_size_max;
  92    rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
  93
  94    /* Use swtnl + decomposition implement these:
  95     */
  96    if (templ->poly_stipple_enable)
  97       rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
  98
  99    if (templ->line_width != 1.0 &&
 100        templ->line_width != 0.0)
 101       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 102
 103    if (templ->line_stipple_enable) {
 104       /* LinePattern not implemented on all backends.
 105        */
 106       if (0) {
 107          SVGA3dLinePattern lp;
 108          lp.repeat = templ->line_stipple_factor + 1;
 109          lp.pattern = templ->line_stipple_pattern;
 110          rast->linepattern = lp.uintValue;
 111       }
 112       else {
 113          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 114       }
 115    }
 116
 117    if (templ->point_smooth)
 118       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
 119
 120    {
 121       boolean offset_cw = templ->offset_cw;
 122       boolean offset_ccw = templ->offset_ccw;
 123       boolean offset  = 0;
 124       int fill_cw = templ->fill_cw;
 125       int fill_ccw = templ->fill_ccw;
 126       int fill = PIPE_POLYGON_MODE_FILL;
 127
 128       switch (templ->cull_mode) {
 129       case PIPE_WINDING_BOTH:
 130          offset = 0;
 131          fill = PIPE_POLYGON_MODE_FILL;
 132          break;
 133
 134       case PIPE_WINDING_CW:
 135          offset = offset_ccw;
 136          fill = fill_ccw;
 137          break;
 138
 139       case PIPE_WINDING_CCW:
 140          offset = offset_cw;
 141          fill = fill_cw;
 142          break;
 143
 144       case PIPE_WINDING_NONE:
 145          if (fill_cw != fill_ccw || offset_cw != offset_ccw)
 146          {
 147             /* Always need the draw module to work out different
 148              * front/back fill modes:
 149              */
 150             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 151          }
 152          else {
 153             offset = offset_ccw;
 154             fill = fill_ccw;
 155          }
 156          break;
 157
 158       default:
 159          assert(0);
 160          break;
 161       }
 162
 163       /* Unfilled primitive modes aren't implemented on all virtual
 164        * hardware.  We can do some unfilled processing with index
 165        * translation, but otherwise need the draw module:
 166        */
 167       if (fill != PIPE_POLYGON_MODE_FILL &&
 168           (templ->flatshade ||
 169            templ->light_twoside ||
 170            offset ||
 171            templ->cull_mode != PIPE_WINDING_NONE))
 172       {
 173          fill = PIPE_POLYGON_MODE_FILL;
 174          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 175       }
 176
 177       /* If we are decomposing to lines, and lines need the pipeline,
 178        * then we also need the pipeline for tris.
 179        */
 180       if (fill == PIPE_POLYGON_MODE_LINE &&
 181           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES))
 182       {
 183          fill = PIPE_POLYGON_MODE_FILL;
 184          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 185       }
 186
 187       /* Similarly for points:
 188        */
 189       if (fill == PIPE_POLYGON_MODE_POINT &&
 190           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS))
 191       {
 192          fill = PIPE_POLYGON_MODE_FILL;
 193          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 194       }
 195
 196       if (offset) {
 197          rast->slopescaledepthbias = templ->offset_scale;
 198          rast->depthbias = templ->offset_units;
 199       }
 200
 201       rast->hw_unfilled = fill;
 202    }
 203
 204
 205
 206
 207    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
 208       /* Turn off stuff which will get done in the draw module:
 209        */
 210       rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
 211       rast->slopescaledepthbias = 0;
 212       rast->depthbias = 0;
 213    }
 214
 215    return rast;
 216 }
 217
 218 static void svga_bind_rasterizer_state( struct pipe_context *pipe,
 219                                         void *state )
 220 {
 221    struct svga_context *svga = svga_context(pipe);
 222    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
 223
 224    svga->curr.rast = raster;
 225
 226    draw_set_rasterizer_state(svga->swtnl.draw, raster ? &raster->templ : NULL);
 227
 228    svga->dirty |= SVGA_NEW_RAST;
 229 }
 230
 231 static void svga_delete_rasterizer_state(struct pipe_context *pipe,
 232                                          void *raster)
 233 {
 234    FREE(raster);
 235 }
 236
 237
 238 void svga_init_rasterizer_functions( struct svga_context *svga )
 239 {
 240    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
 241    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
 242    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 243 }
 244
 245
 246 /***********************************************************************
 247  * Hardware state update
 248  */
 249