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 "pipe/p_defines.h"
  27 #include "draw/draw_context.h"
  28 #include "util/u_bitmask.h"
  29 #include "util/u_inlines.h"
  30 #include "util/u_math.h"
  31 #include "util/u_memory.h"
  32
  33 #include "svga_cmd.h"
  34 #include "svga_context.h"
  35 #include "svga_hw_reg.h"
  36 #include "svga_screen.h"
  37
  38
  39 /* Hardware frontwinding is always set up as SVGA3D_FRONTWINDING_CW.
  40  */
  41 static SVGA3dFace
  42 svga_translate_cullmode(unsigned mode, unsigned front_ccw)
  43 {
  44    const int hw_front_ccw = 0;  /* hardware is always CW */
  45    switch (mode) {
  46    case PIPE_FACE_NONE:
  47       return SVGA3D_FACE_NONE;
  48    case PIPE_FACE_FRONT:
  49       return front_ccw == hw_front_ccw ? SVGA3D_FACE_FRONT : SVGA3D_FACE_BACK;
  50    case PIPE_FACE_BACK:
  51       return front_ccw == hw_front_ccw ? SVGA3D_FACE_BACK : SVGA3D_FACE_FRONT;
  52    case PIPE_FACE_FRONT_AND_BACK:
  53       return SVGA3D_FACE_FRONT_BACK;
  54    default:
  55       assert(0);
  56       return SVGA3D_FACE_NONE;
  57    }
  58 }
  59
  60 static SVGA3dShadeMode
  61 svga_translate_flatshade(unsigned mode)
  62 {
  63    return mode ? SVGA3D_SHADEMODE_FLAT : SVGA3D_SHADEMODE_SMOOTH;
  64 }
  65
  66
  67 static unsigned
  68 translate_fill_mode(unsigned fill)
  69 {
  70    switch (fill) {
  71    case PIPE_POLYGON_MODE_POINT:
  72       return SVGA3D_FILLMODE_POINT;
  73    case PIPE_POLYGON_MODE_LINE:
  74       return SVGA3D_FILLMODE_LINE;
  75    case PIPE_POLYGON_MODE_FILL:
  76       return SVGA3D_FILLMODE_FILL;
  77    default:
  78       assert(!"Bad fill mode");
  79       return SVGA3D_FILLMODE_FILL;
  80    }
  81 }
  82
  83
  84 static unsigned
  85 translate_cull_mode(unsigned cull)
  86 {
  87    switch (cull) {
  88    case PIPE_FACE_NONE:
  89       return SVGA3D_CULL_NONE;
  90    case PIPE_FACE_FRONT:
  91       return SVGA3D_CULL_FRONT;
  92    case PIPE_FACE_BACK:
  93       return SVGA3D_CULL_BACK;
  94    case PIPE_FACE_FRONT_AND_BACK:
  95       /* NOTE: we simply no-op polygon drawing in svga_draw_vbo() */
  96       return SVGA3D_CULL_NONE;
  97    default:
  98       assert(!"Bad cull mode");
  99       return SVGA3D_CULL_NONE;
 100    }
 101 }
 102
 103
 104 static void
 105 define_rasterizer_object(struct svga_context *svga,
 106                          struct svga_rasterizer_state *rast)
 107 {
 108    struct svga_screen *svgascreen = svga_screen(svga->pipe.screen);
 109    unsigned fill_mode = translate_fill_mode(rast->templ.fill_front);
 110    const unsigned cull_mode = translate_cull_mode(rast->templ.cull_face);
 111    const int depth_bias = rast->templ.offset_units;
 112    const float slope_scaled_depth_bias = rast->templ.offset_scale;
 113    /* PIPE_CAP_POLYGON_OFFSET_CLAMP not supported: */
 114    const float depth_bias_clamp = 0.0;
 115    const float line_width = rast->templ.line_width > 0.0f ?
 116       rast->templ.line_width : 1.0f;
 117    const uint8 line_factor = rast->templ.line_stipple_enable ?
 118       rast->templ.line_stipple_factor : 0;
 119    const uint16 line_pattern = rast->templ.line_stipple_enable ?
 120       rast->templ.line_stipple_pattern : 0;
 121    unsigned try;
 122
 123    rast->id = util_bitmask_add(svga->rast_object_id_bm);
 124
 125    if (rast->templ.fill_front != rast->templ.fill_back) {
 126       /* The VGPU10 device can't handle different front/back fill modes.
 127        * We'll handle that with a swtnl/draw fallback.  But we need to
 128        * make sure we always fill triangles in that case.
 129        */
 130       fill_mode = SVGA3D_FILLMODE_FILL;
 131    }
 132
 133    for (try = 0; try < 2; try++) {
 134       const uint8 pv_last = !rast->templ.flatshade_first &&
 135          svgascreen->haveProvokingVertex;
 136       enum pipe_error ret =
 137          SVGA3D_vgpu10_DefineRasterizerState(svga->swc,
 138                                              rast->id,
 139                                              fill_mode,
 140                                              cull_mode,
 141                                              rast->templ.front_ccw,
 142                                              depth_bias,
 143                                              depth_bias_clamp,
 144                                              slope_scaled_depth_bias,
 145                                              rast->templ.depth_clip_near,
 146                                              rast->templ.scissor,
 147                                              rast->templ.multisample,
 148                                              rast->templ.line_smooth,
 149                                              line_width,
 150                                              rast->templ.line_stipple_enable,
 151                                              line_factor,
 152                                              line_pattern,
 153                                              pv_last);
 154       if (ret == PIPE_OK)
 155          return;
 156       svga_context_flush(svga, NULL);
 157    }
 158 }
 159
 160
 161 static void *
 162 svga_create_rasterizer_state(struct pipe_context *pipe,
 163                              const struct pipe_rasterizer_state *templ)
 164 {
 165    struct svga_context *svga = svga_context(pipe);
 166    struct svga_rasterizer_state *rast = CALLOC_STRUCT(svga_rasterizer_state);
 167    struct svga_screen *screen = svga_screen(pipe->screen);
 168
 169    if (!rast)
 170       return NULL;
 171
 172    /* need this for draw module. */
 173    rast->templ = *templ;
 174
 175    /* light_twoside          - XXX: need fragment shader variant */
 176    /* poly_smooth            - XXX: no fallback available */
 177    /* poly_stipple_enable    - draw module */
 178    /* sprite_coord_enable    - ? */
 179    /* point_quad_rasterization - ? */
 180    /* point_size_per_vertex  - ? */
 181    /* sprite_coord_mode      - ??? */
 182    /* flatshade_first        - handled by index translation */
 183    /* half_pixel_center      - XXX - viewport code */
 184    /* line_width             - draw module */
 185    /* fill_cw, fill_ccw      - draw module or index translation */
 186
 187    rast->shademode = svga_translate_flatshade(templ->flatshade);
 188    rast->cullmode = svga_translate_cullmode(templ->cull_face, templ->front_ccw);
 189    rast->scissortestenable = templ->scissor;
 190    rast->multisampleantialias = templ->multisample;
 191    rast->antialiasedlineenable = templ->line_smooth;
 192    rast->lastpixel = templ->line_last_pixel;
 193    rast->pointsprite = templ->sprite_coord_enable != 0x0;
 194
 195    if (templ->point_smooth) {
 196       /* For smooth points we need to generate fragments for at least
 197        * a 2x2 region.  Otherwise the quad we draw may be too small and
 198        * we may generate no fragments at all.
 199        */
 200       rast->pointsize = MAX2(2.0f, templ->point_size);
 201    }
 202    else {
 203       rast->pointsize = templ->point_size;
 204    }
 205
 206    rast->hw_fillmode = PIPE_POLYGON_MODE_FILL;
 207
 208    /* Use swtnl + decomposition implement these:
 209     */
 210
 211    if (templ->line_width <= screen->maxLineWidth) {
 212       /* pass line width to device */
 213       rast->linewidth = MAX2(1.0F, templ->line_width);
 214    }
 215    else if (svga->debug.no_line_width) {
 216       /* nothing */
 217    }
 218    else {
 219       /* use 'draw' pipeline for wide line */
 220       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 221       rast->need_pipeline_lines_str = "line width";
 222    }
 223
 224    if (templ->line_stipple_enable) {
 225       if (screen->haveLineStipple || svga->debug.force_hw_line_stipple) {
 226          SVGA3dLinePattern lp;
 227          lp.repeat = templ->line_stipple_factor + 1;
 228          lp.pattern = templ->line_stipple_pattern;
 229          rast->linepattern = lp.uintValue;
 230       }
 231       else {
 232          /* use 'draw' module to decompose into short line segments */
 233          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 234          rast->need_pipeline_lines_str = "line stipple";
 235       }
 236    }
 237
 238    if (!svga_have_vgpu10(svga) && templ->point_smooth) {
 239       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
 240       rast->need_pipeline_points_str = "smooth points";
 241    }
 242
 243    if (templ->line_smooth && !screen->haveLineSmooth) {
 244       /*
 245        * XXX: Enabling the pipeline slows down performance immensely, so ignore
 246        * line smooth state, where there is very little visual improvement.
 247        * Smooth lines will still be drawn for wide lines.
 248        */
 249 #if 0
 250       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 251       rast->need_pipeline_lines_str = "smooth lines";
 252 #endif
 253    }
 254
 255    {
 256       int fill_front = templ->fill_front;
 257       int fill_back = templ->fill_back;
 258       int fill;
 259       boolean offset_front = util_get_offset(templ, fill_front);
 260       boolean offset_back = util_get_offset(templ, fill_back);
 261       boolean offset = FALSE;
 262
 263       switch (templ->cull_face) {
 264       case PIPE_FACE_FRONT_AND_BACK:
 265          offset = FALSE;
 266          fill = PIPE_POLYGON_MODE_FILL;
 267          break;
 268
 269       case PIPE_FACE_FRONT:
 270          offset = offset_back;
 271          fill = fill_back;
 272          break;
 273
 274       case PIPE_FACE_BACK:
 275          offset = offset_front;
 276          fill = fill_front;
 277          break;
 278
 279       case PIPE_FACE_NONE:
 280          if (fill_front != fill_back || offset_front != offset_back) {
 281             /* Always need the draw module to work out different
 282              * front/back fill modes:
 283              */
 284             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 285             rast->need_pipeline_tris_str = "different front/back fillmodes";
 286             fill = PIPE_POLYGON_MODE_FILL;
 287          }
 288          else {
 289             offset = offset_front;
 290             fill = fill_front;
 291          }
 292          break;
 293
 294       default:
 295          assert(0);
 296          break;
 297       }
 298
 299       /* Unfilled primitive modes aren't implemented on all virtual
 300        * hardware.  We can do some unfilled processing with index
 301        * translation, but otherwise need the draw module:
 302        */
 303       if (fill != PIPE_POLYGON_MODE_FILL &&
 304           (templ->flatshade ||
 305            templ->light_twoside ||
 306            offset)) {
 307          fill = PIPE_POLYGON_MODE_FILL;
 308          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 309          rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
 310       }
 311
 312       /* If we are decomposing to lines, and lines need the pipeline,
 313        * then we also need the pipeline for tris.
 314        */
 315       if (fill == PIPE_POLYGON_MODE_LINE &&
 316           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES)) {
 317          fill = PIPE_POLYGON_MODE_FILL;
 318          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 319          rast->need_pipeline_tris_str = "decomposing lines";
 320       }
 321
 322       /* Similarly for points:
 323        */
 324       if (fill == PIPE_POLYGON_MODE_POINT &&
 325           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS)) {
 326          fill = PIPE_POLYGON_MODE_FILL;
 327          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 328          rast->need_pipeline_tris_str = "decomposing points";
 329       }
 330
 331       if (offset) {
 332          rast->slopescaledepthbias = templ->offset_scale;
 333          rast->depthbias = templ->offset_units;
 334       }
 335
 336       rast->hw_fillmode = fill;
 337    }
 338
 339    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
 340       /* Turn off stuff which will get done in the draw module:
 341        */
 342       rast->hw_fillmode = PIPE_POLYGON_MODE_FILL;
 343       rast->slopescaledepthbias = 0;
 344       rast->depthbias = 0;
 345    }
 346
 347    if (0 && rast->need_pipeline) {
 348       debug_printf("svga: rast need_pipeline = 0x%x\n", rast->need_pipeline);
 349       debug_printf(" pnts: %s \n", rast->need_pipeline_points_str);
 350       debug_printf(" lins: %s \n", rast->need_pipeline_lines_str);
 351       debug_printf(" tris: %s \n", rast->need_pipeline_tris_str);
 352    }
 353
 354    if (svga_have_vgpu10(svga)) {
 355       define_rasterizer_object(svga, rast);
 356    }
 357
 358    if (templ->poly_smooth) {
 359       pipe_debug_message(&svga->debug.callback, CONFORMANCE,
 360                          "GL_POLYGON_SMOOTH not supported");
 361    }
 362
 363    svga->hud.num_rasterizer_objects++;
 364    SVGA_STATS_COUNT_INC(svga_screen(svga->pipe.screen)->sws,
 365                         SVGA_STATS_COUNT_RASTERIZERSTATE);
 366
 367    return rast;
 368 }
 369
 370
 371 static void
 372 svga_bind_rasterizer_state(struct pipe_context *pipe, void *state)
 373 {
 374    struct svga_context *svga = svga_context(pipe);
 375    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
 376
 377    if (!raster || !svga->curr.rast) {
 378       svga->dirty |= SVGA_NEW_STIPPLE | SVGA_NEW_DEPTH_STENCIL_ALPHA;
 379    }
 380    else {
 381       if (raster->templ.poly_stipple_enable !=
 382           svga->curr.rast->templ.poly_stipple_enable) {
 383          svga->dirty |= SVGA_NEW_STIPPLE;
 384       }
 385       if (raster->templ.rasterizer_discard !=
 386           svga->curr.rast->templ.rasterizer_discard) {
 387          svga->dirty |= SVGA_NEW_DEPTH_STENCIL_ALPHA;
 388       }
 389    }
 390
 391    svga->curr.rast = raster;
 392
 393    svga->dirty |= SVGA_NEW_RAST;
 394 }
 395
 396
 397 static void
 398 svga_delete_rasterizer_state(struct pipe_context *pipe, void *state)
 399 {
 400    struct svga_context *svga = svga_context(pipe);
 401    struct svga_rasterizer_state *raster =
 402       (struct svga_rasterizer_state *) state;
 403
 404    if (svga_have_vgpu10(svga)) {
 405       enum pipe_error ret =
 406          SVGA3D_vgpu10_DestroyRasterizerState(svga->swc, raster->id);
 407       if (ret != PIPE_OK) {
 408          svga_context_flush(svga, NULL);
 409          ret = SVGA3D_vgpu10_DestroyRasterizerState(svga->swc, raster->id);
 410       }
 411
 412       if (raster->id == svga->state.hw_draw.rasterizer_id)
 413          svga->state.hw_draw.rasterizer_id = SVGA3D_INVALID_ID;
 414
 415       util_bitmask_clear(svga->rast_object_id_bm, raster->id);
 416    }
 417
 418    FREE(state);
 419    svga->hud.num_rasterizer_objects--;
 420 }
 421
 422
 423 void
 424 svga_init_rasterizer_functions(struct svga_context *svga)
 425 {
 426    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
 427    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
 428    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 429 }