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 "util/u_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 #include "svga_screen.h"
  34
  35 #include "svga_hw_reg.h"
  36
  37 /* Hardware frontwinding is always set up as SVGA3D_FRONTWINDING_CW.
  38  */
  39 static SVGA3dFace svga_translate_cullmode( unsigned mode,
  40                                            unsigned front_ccw )
  41 {
  42    const int hw_front_ccw = 0;  /* hardware is always CW */
  43    switch (mode) {
  44    case PIPE_FACE_NONE:
  45       return SVGA3D_FACE_NONE;
  46    case PIPE_FACE_FRONT:
  47       return front_ccw == hw_front_ccw ? SVGA3D_FACE_FRONT : SVGA3D_FACE_BACK;
  48    case PIPE_FACE_BACK:
  49       return front_ccw == hw_front_ccw ? SVGA3D_FACE_BACK : SVGA3D_FACE_FRONT;
  50    case PIPE_FACE_FRONT_AND_BACK:
  51       return SVGA3D_FACE_FRONT_BACK;
  52    default:
  53       assert(0);
  54       return SVGA3D_FACE_NONE;
  55    }
  56 }
  57
  58 static SVGA3dShadeMode svga_translate_flatshade( unsigned mode )
  59 {
  60    return mode ? SVGA3D_SHADEMODE_FLAT : SVGA3D_SHADEMODE_SMOOTH;
  61 }
  62
  63
  64 static void *
  65 svga_create_rasterizer_state(struct pipe_context *pipe,
  66                              const struct pipe_rasterizer_state *templ)
  67 {
  68    struct svga_context *svga = svga_context(pipe);
  69    struct svga_rasterizer_state *rast = CALLOC_STRUCT( svga_rasterizer_state );
  70    struct svga_screen *screen = svga_screen(pipe->screen);
  71
  72    /* need this for draw module. */
  73    rast->templ = *templ;
  74
  75    /* light_twoside          - XXX: need fragment shader variant */
  76    /* poly_smooth            - XXX: no fallback available */
  77    /* poly_stipple_enable    - draw module */
  78    /* sprite_coord_enable    - ? */
  79    /* point_quad_rasterization - ? */
  80    /* point_size_per_vertex  - ? */
  81    /* sprite_coord_mode      - ??? */
  82    /* flatshade_first        - handled by index translation */
  83    /* half_pixel_center      - XXX - viewport code */
  84    /* line_width             - draw module */
  85    /* fill_cw, fill_ccw      - draw module or index translation */
  86
  87    rast->shademode = svga_translate_flatshade( templ->flatshade );
  88    rast->cullmode = svga_translate_cullmode( templ->cull_face,
  89                                              templ->front_ccw );
  90    rast->scissortestenable = templ->scissor;
  91    rast->multisampleantialias = templ->multisample;
  92    rast->antialiasedlineenable = templ->line_smooth;
  93    rast->lastpixel = templ->line_last_pixel;
  94    rast->pointsprite = templ->sprite_coord_enable != 0x0;
  95    rast->pointsize = templ->point_size;
  96    rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
  97
  98    /* Use swtnl + decomposition implement these:
  99     */
 100    if (templ->poly_stipple_enable) {
 101       rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 102       rast->need_pipeline_tris_str = "poly stipple";
 103    }
 104
 105    if (screen->maxLineWidth > 1.0F) {
 106       /* pass line width to device */
 107       rast->linewidth = MAX2(1.0F, templ->line_width);
 108    }
 109    else if (svga->debug.no_line_width) {
 110       /* nothing */
 111    }
 112    else {
 113       /* use 'draw' pipeline for wide line */
 114       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 115       rast->need_pipeline_lines_str = "line width";
 116    }
 117
 118    if (templ->line_stipple_enable) {
 119       if (screen->haveLineStipple || svga->debug.force_hw_line_stipple) {
 120          SVGA3dLinePattern lp;
 121          lp.repeat = templ->line_stipple_factor + 1;
 122          lp.pattern = templ->line_stipple_pattern;
 123          rast->linepattern = lp.uintValue;
 124       }
 125       else {
 126          /* use 'draw' module to decompose into short line segments */
 127          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 128          rast->need_pipeline_lines_str = "line stipple";
 129       }
 130    }
 131
 132    if (templ->point_smooth) {
 133       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
 134       rast->need_pipeline_points_str = "smooth points";
 135    }
 136
 137    if (templ->line_smooth && !screen->haveLineSmooth) {
 138       /*
 139        * XXX: Enabling the pipeline slows down performance immensely, so ignore
 140        * line smooth state, where there is very little visual improvement.
 141        * Smooth lines will still be drawn for wide lines.
 142        */
 143 #if 0
 144       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 145       rast->need_pipeline_lines_str = "smooth lines";
 146 #endif
 147    }
 148
 149    {
 150       int fill_front = templ->fill_front;
 151       int fill_back = templ->fill_back;
 152       int fill = PIPE_POLYGON_MODE_FILL;
 153       boolean offset_front = util_get_offset(templ, fill_front);
 154       boolean offset_back = util_get_offset(templ, fill_back);
 155       boolean offset = FALSE;
 156
 157       switch (templ->cull_face) {
 158       case PIPE_FACE_FRONT_AND_BACK:
 159          offset = FALSE;
 160          fill = PIPE_POLYGON_MODE_FILL;
 161          break;
 162
 163       case PIPE_FACE_FRONT:
 164          offset = offset_front;
 165          fill = fill_front;
 166          break;
 167
 168       case PIPE_FACE_BACK:
 169          offset = offset_back;
 170          fill = fill_back;
 171          break;
 172
 173       case PIPE_FACE_NONE:
 174          if (fill_front != fill_back || offset_front != offset_back)
 175          {
 176             /* Always need the draw module to work out different
 177              * front/back fill modes:
 178              */
 179             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 180             rast->need_pipeline_tris_str = "different front/back fillmodes";
 181          }
 182          else {
 183             offset = offset_front;
 184             fill = fill_front;
 185          }
 186          break;
 187
 188       default:
 189          assert(0);
 190          break;
 191       }
 192
 193       /* Unfilled primitive modes aren't implemented on all virtual
 194        * hardware.  We can do some unfilled processing with index
 195        * translation, but otherwise need the draw module:
 196        */
 197       if (fill != PIPE_POLYGON_MODE_FILL &&
 198           (templ->flatshade ||
 199            templ->light_twoside ||
 200            offset ||
 201            templ->cull_face != PIPE_FACE_NONE))
 202       {
 203          fill = PIPE_POLYGON_MODE_FILL;
 204          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 205          rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
 206       }
 207
 208       /* If we are decomposing to lines, and lines need the pipeline,
 209        * then we also need the pipeline for tris.
 210        */
 211       if (fill == PIPE_POLYGON_MODE_LINE &&
 212           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES))
 213       {
 214          fill = PIPE_POLYGON_MODE_FILL;
 215          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 216          rast->need_pipeline_tris_str = "decomposing lines";
 217       }
 218
 219       /* Similarly for points:
 220        */
 221       if (fill == PIPE_POLYGON_MODE_POINT &&
 222           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS))
 223       {
 224          fill = PIPE_POLYGON_MODE_FILL;
 225          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 226          rast->need_pipeline_tris_str = "decomposing points";
 227       }
 228
 229       if (offset) {
 230          rast->slopescaledepthbias = templ->offset_scale;
 231          rast->depthbias = templ->offset_units;
 232       }
 233
 234       rast->hw_unfilled = fill;
 235    }
 236
 237    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
 238       /* Turn off stuff which will get done in the draw module:
 239        */
 240       rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
 241       rast->slopescaledepthbias = 0;
 242       rast->depthbias = 0;
 243    }
 244
 245    if (0 && rast->need_pipeline) {
 246       debug_printf("svga: rast need_pipeline = 0x%x\n", rast->need_pipeline);
 247       debug_printf(" pnts: %s \n", rast->need_pipeline_points_str);
 248       debug_printf(" lins: %s \n", rast->need_pipeline_lines_str);
 249       debug_printf(" tris: %s \n", rast->need_pipeline_tris_str);
 250    }
 251
 252    return rast;
 253 }
 254
 255 static void svga_bind_rasterizer_state( struct pipe_context *pipe,
 256                                         void *state )
 257 {
 258    struct svga_context *svga = svga_context(pipe);
 259    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
 260
 261
 262    draw_set_rasterizer_state(svga->swtnl.draw, raster ? &raster->templ : NULL,
 263                              state);
 264    svga->curr.rast = raster;
 265
 266    svga->dirty |= SVGA_NEW_RAST;
 267 }
 268
 269 static void svga_delete_rasterizer_state(struct pipe_context *pipe,
 270                                          void *raster)
 271 {
 272    FREE(raster);
 273 }
 274
 275
 276 void svga_init_rasterizer_functions( struct svga_context *svga )
 277 {
 278    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
 279    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
 280    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 281 }
 282
 283
 284 /***********************************************************************
 285  * Hardware state update
 286  */
 287