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
  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    /* sprite_coord_enable    - ? */
  74    /* point_quad_rasterization - ? */
  75    /* point_size_per_vertex  - ? */
  76    /* sprite_coord_mode      - ??? */
  77    /* bypass_vs_viewport_and_clip        - handled by viewport setup */
  78    /* flatshade_first        - handled by index translation */
  79    /* gl_rasterization_rules - XXX - viewport code */
  80    /* line_width             - draw module */
  81    /* fill_cw, fill_ccw      - draw module or index translation */
  82
  83    rast->shademode = svga_translate_flatshade( templ->flatshade );
  84    rast->cullmode = svga_translate_cullmode( templ->cull_mode,
  85                                              templ->front_winding );
  86    rast->scissortestenable = templ->scissor;
  87    rast->multisampleantialias = templ->multisample;
  88    rast->antialiasedlineenable = templ->line_smooth;
  89    rast->lastpixel = templ->line_last_pixel;
  90    rast->pointsize = templ->point_size;
  91    rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
  92
  93    /* Use swtnl + decomposition implement these:
  94     */
  95    if (templ->poly_stipple_enable)
  96       rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
  97
  98    if (templ->line_width != 1.0 &&
  99        templ->line_width != 0.0)
 100       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 101
 102    if (templ->line_stipple_enable) {
 103       /* LinePattern not implemented on all backends.
 104        */
 105       if (0) {
 106          SVGA3dLinePattern lp;
 107          lp.repeat = templ->line_stipple_factor + 1;
 108          lp.pattern = templ->line_stipple_pattern;
 109          rast->linepattern = lp.uintValue;
 110       }
 111       else {
 112          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 113       }
 114    }
 115
 116    if (templ->point_smooth)
 117       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
 118
 119    {
 120       boolean offset_cw = templ->offset_cw;
 121       boolean offset_ccw = templ->offset_ccw;
 122       boolean offset  = 0;
 123       int fill_cw = templ->fill_cw;
 124       int fill_ccw = templ->fill_ccw;
 125       int fill = PIPE_POLYGON_MODE_FILL;
 126
 127       switch (templ->cull_mode) {
 128       case PIPE_WINDING_BOTH:
 129          offset = 0;
 130          fill = PIPE_POLYGON_MODE_FILL;
 131          break;
 132
 133       case PIPE_WINDING_CW:
 134          offset = offset_ccw;
 135          fill = fill_ccw;
 136          break;
 137
 138       case PIPE_WINDING_CCW:
 139          offset = offset_cw;
 140          fill = fill_cw;
 141          break;
 142
 143       case PIPE_WINDING_NONE:
 144          if (fill_cw != fill_ccw || offset_cw != offset_ccw)
 145          {
 146             /* Always need the draw module to work out different
 147              * front/back fill modes:
 148              */
 149             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 150          }
 151          else {
 152             offset = offset_ccw;
 153             fill = fill_ccw;
 154          }
 155          break;
 156
 157       default:
 158          assert(0);
 159          break;
 160       }
 161
 162       /* Unfilled primitive modes aren't implemented on all virtual
 163        * hardware.  We can do some unfilled processing with index
 164        * translation, but otherwise need the draw module:
 165        */
 166       if (fill != PIPE_POLYGON_MODE_FILL &&
 167           (templ->flatshade ||
 168            templ->light_twoside ||
 169            offset ||
 170            templ->cull_mode != PIPE_WINDING_NONE))
 171       {
 172          fill = PIPE_POLYGON_MODE_FILL;
 173          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 174       }
 175
 176       /* If we are decomposing to lines, and lines need the pipeline,
 177        * then we also need the pipeline for tris.
 178        */
 179       if (fill == PIPE_POLYGON_MODE_LINE &&
 180           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES))
 181       {
 182          fill = PIPE_POLYGON_MODE_FILL;
 183          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 184       }
 185
 186       /* Similarly for points:
 187        */
 188       if (fill == PIPE_POLYGON_MODE_POINT &&
 189           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS))
 190       {
 191          fill = PIPE_POLYGON_MODE_FILL;
 192          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 193       }
 194
 195       if (offset) {
 196          rast->slopescaledepthbias = templ->offset_scale;
 197          rast->depthbias = templ->offset_units;
 198       }
 199
 200       rast->hw_unfilled = fill;
 201    }
 202
 203
 204
 205
 206    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
 207       /* Turn off stuff which will get done in the draw module:
 208        */
 209       rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
 210       rast->slopescaledepthbias = 0;
 211       rast->depthbias = 0;
 212    }
 213
 214    return rast;
 215 }
 216
 217 static void svga_bind_rasterizer_state( struct pipe_context *pipe,
 218                                         void *state )
 219 {
 220    struct svga_context *svga = svga_context(pipe);
 221    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
 222
 223    svga->curr.rast = raster;
 224
 225    draw_set_rasterizer_state(svga->swtnl.draw, raster ? &raster->templ : NULL);
 226
 227    svga->dirty |= SVGA_NEW_RAST;
 228 }
 229
 230 static void svga_delete_rasterizer_state(struct pipe_context *pipe,
 231                                          void *raster)
 232 {
 233    FREE(raster);
 234 }
 235
 236
 237 void svga_init_rasterizer_functions( struct svga_context *svga )
 238 {
 239    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
 240    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
 241    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 242 }
 243
 244
 245 /***********************************************************************
 246  * Hardware state update
 247  */
 248