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    rast->shademode = svga_translate_flatshade(templ->flatshade);
 176    rast->cullmode = svga_translate_cullmode(templ->cull_face, templ->front_ccw);
 177    rast->scissortestenable = templ->scissor;
 178    rast->multisampleantialias = templ->multisample;
 179    rast->antialiasedlineenable = templ->line_smooth;
 180    rast->lastpixel = templ->line_last_pixel;
 181    rast->pointsprite = templ->point_quad_rasterization;
 182
 183    if (rast->templ.multisample) {
 184       /* The OpenGL 3.0 spec says points are always drawn as circles when
 185        * MSAA is enabled.  Note that our implementation isn't 100% correct,
 186        * though.  Our smooth point implementation involves drawing a square,
 187        * computing fragment distance from point center, then attenuating
 188        * the fragment alpha value.  We should not attenuate alpha if msaa
 189        * is enabled.  We should kill fragments entirely outside the circle
 190        * and let the GPU compute per-fragment coverage.
 191        * But as-is, our implementation gives acceptable results and passes
 192        * Piglit's MSAA point smooth test.
 193        */
 194       rast->templ.point_smooth = TRUE;
 195    }
 196
 197    if (templ->point_smooth) {
 198       /* For smooth points we need to generate fragments for at least
 199        * a 2x2 region.  Otherwise the quad we draw may be too small and
 200        * we may generate no fragments at all.
 201        */
 202       rast->pointsize = MAX2(2.0f, templ->point_size);
 203    }
 204    else {
 205       rast->pointsize = templ->point_size;
 206    }
 207
 208    rast->hw_fillmode = PIPE_POLYGON_MODE_FILL;
 209
 210    /* Use swtnl + decomposition implement these:
 211     */
 212
 213    if (templ->line_width <= screen->maxLineWidth) {
 214       /* pass line width to device */
 215       rast->linewidth = MAX2(1.0F, templ->line_width);
 216    }
 217    else if (svga->debug.no_line_width) {
 218       /* nothing */
 219    }
 220    else {
 221       /* use 'draw' pipeline for wide line */
 222       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 223       rast->need_pipeline_lines_str = "line width";
 224    }
 225
 226    if (templ->line_stipple_enable) {
 227       if (screen->haveLineStipple || svga->debug.force_hw_line_stipple) {
 228          SVGA3dLinePattern lp;
 229          lp.repeat = templ->line_stipple_factor + 1;
 230          lp.pattern = templ->line_stipple_pattern;
 231          rast->linepattern = lp.uintValue;
 232       }
 233       else {
 234          /* use 'draw' module to decompose into short line segments */
 235          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 236          rast->need_pipeline_lines_str = "line stipple";
 237       }
 238    }
 239
 240    if (!svga_have_vgpu10(svga) && templ->point_smooth) {
 241       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
 242       rast->need_pipeline_points_str = "smooth points";
 243    }
 244
 245    if (templ->line_smooth && !screen->haveLineSmooth) {
 246       /*
 247        * XXX: Enabling the pipeline slows down performance immensely, so ignore
 248        * line smooth state, where there is very little visual improvement.
 249        * Smooth lines will still be drawn for wide lines.
 250        */
 251 #if 0
 252       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 253       rast->need_pipeline_lines_str = "smooth lines";
 254 #endif
 255    }
 256
 257    {
 258       int fill_front = templ->fill_front;
 259       int fill_back = templ->fill_back;
 260       int fill = PIPE_POLYGON_MODE_FILL;
 261       boolean offset_front = util_get_offset(templ, fill_front);
 262       boolean offset_back = util_get_offset(templ, fill_back);
 263       boolean offset = FALSE;
 264
 265       switch (templ->cull_face) {
 266       case PIPE_FACE_FRONT_AND_BACK:
 267          offset = FALSE;
 268          fill = PIPE_POLYGON_MODE_FILL;
 269          break;
 270
 271       case PIPE_FACE_FRONT:
 272          offset = offset_back;
 273          fill = fill_back;
 274          break;
 275
 276       case PIPE_FACE_BACK:
 277          offset = offset_front;
 278          fill = fill_front;
 279          break;
 280
 281       case PIPE_FACE_NONE:
 282          if (fill_front != fill_back || offset_front != offset_back) {
 283             /* Always need the draw module to work out different
 284              * front/back fill modes:
 285              */
 286             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 287             rast->need_pipeline_tris_str = "different front/back fillmodes";
 288             fill = PIPE_POLYGON_MODE_FILL;
 289          }
 290          else {
 291             offset = offset_front;
 292             fill = fill_front;
 293          }
 294          break;
 295
 296       default:
 297          assert(0);
 298          break;
 299       }
 300
 301       /* Unfilled primitive modes aren't implemented on all virtual
 302        * hardware.  We can do some unfilled processing with index
 303        * translation, but otherwise need the draw module:
 304        */
 305       if (fill != PIPE_POLYGON_MODE_FILL &&
 306           (templ->flatshade ||
 307            templ->light_twoside ||
 308            offset)) {
 309          fill = PIPE_POLYGON_MODE_FILL;
 310          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 311          rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
 312       }
 313
 314       /* If we are decomposing to lines, and lines need the pipeline,
 315        * then we also need the pipeline for tris.
 316        */
 317       if (fill == PIPE_POLYGON_MODE_LINE &&
 318           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES)) {
 319          fill = PIPE_POLYGON_MODE_FILL;
 320          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 321          rast->need_pipeline_tris_str = "decomposing lines";
 322       }
 323
 324       /* Similarly for points:
 325        */
 326       if (fill == PIPE_POLYGON_MODE_POINT &&
 327           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS)) {
 328          fill = PIPE_POLYGON_MODE_FILL;
 329          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 330          rast->need_pipeline_tris_str = "decomposing points";
 331       }
 332
 333       if (offset) {
 334          rast->slopescaledepthbias = templ->offset_scale;
 335          rast->depthbias = templ->offset_units;
 336       }
 337
 338       rast->hw_fillmode = fill;
 339    }
 340
 341    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
 342       /* Turn off stuff which will get done in the draw module:
 343        */
 344       rast->hw_fillmode = PIPE_POLYGON_MODE_FILL;
 345       rast->slopescaledepthbias = 0;
 346       rast->depthbias = 0;
 347    }
 348
 349    if (0 && rast->need_pipeline) {
 350       debug_printf("svga: rast need_pipeline = 0x%x\n", rast->need_pipeline);
 351       debug_printf(" pnts: %s \n", rast->need_pipeline_points_str);
 352       debug_printf(" lins: %s \n", rast->need_pipeline_lines_str);
 353       debug_printf(" tris: %s \n", rast->need_pipeline_tris_str);
 354    }
 355
 356    if (svga_have_vgpu10(svga)) {
 357       define_rasterizer_object(svga, rast);
 358    }
 359
 360    if (templ->poly_smooth) {
 361       pipe_debug_message(&svga->debug.callback, CONFORMANCE,
 362                          "GL_POLYGON_SMOOTH not supported");
 363    }
 364
 365    svga->hud.num_rasterizer_objects++;
 366    SVGA_STATS_COUNT_INC(svga_screen(svga->pipe.screen)->sws,
 367                         SVGA_STATS_COUNT_RASTERIZERSTATE);
 368
 369    return rast;
 370 }
 371
 372
 373 static void
 374 svga_bind_rasterizer_state(struct pipe_context *pipe, void *state)
 375 {
 376    struct svga_context *svga = svga_context(pipe);
 377    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
 378
 379    if (!raster || !svga->curr.rast) {
 380       svga->dirty |= SVGA_NEW_STIPPLE | SVGA_NEW_DEPTH_STENCIL_ALPHA;
 381    }
 382    else {
 383       if (raster->templ.poly_stipple_enable !=
 384           svga->curr.rast->templ.poly_stipple_enable) {
 385          svga->dirty |= SVGA_NEW_STIPPLE;
 386       }
 387       if (raster->templ.rasterizer_discard !=
 388           svga->curr.rast->templ.rasterizer_discard) {
 389          svga->dirty |= SVGA_NEW_DEPTH_STENCIL_ALPHA;
 390       }
 391    }
 392
 393    svga->curr.rast = raster;
 394
 395    svga->dirty |= SVGA_NEW_RAST;
 396 }
 397
 398
 399 static void
 400 svga_delete_rasterizer_state(struct pipe_context *pipe, void *state)
 401 {
 402    struct svga_context *svga = svga_context(pipe);
 403    struct svga_rasterizer_state *raster =
 404       (struct svga_rasterizer_state *) state;
 405
 406    if (svga_have_vgpu10(svga)) {
 407       enum pipe_error ret =
 408          SVGA3D_vgpu10_DestroyRasterizerState(svga->swc, raster->id);
 409       if (ret != PIPE_OK) {
 410          svga_context_flush(svga, NULL);
 411          ret = SVGA3D_vgpu10_DestroyRasterizerState(svga->swc, raster->id);
 412       }
 413
 414       if (raster->id == svga->state.hw_draw.rasterizer_id)
 415          svga->state.hw_draw.rasterizer_id = SVGA3D_INVALID_ID;
 416
 417       util_bitmask_clear(svga->rast_object_id_bm, raster->id);
 418    }
 419
 420    FREE(state);
 421    svga->hud.num_rasterizer_objects--;
 422 }
 423
 424
 425 void
 426 svga_init_rasterizer_functions(struct svga_context *svga)
 427 {
 428    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
 429    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
 430    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 431 }