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    const uint8 pv_last = !rast->templ.flatshade_first &&
 122       svgascreen->haveProvokingVertex;
 123
 124    rast->id = util_bitmask_add(svga->rast_object_id_bm);
 125
 126    if (rast->templ.fill_front != rast->templ.fill_back) {
 127       /* The VGPU10 device can't handle different front/back fill modes.
 128        * We'll handle that with a swtnl/draw fallback.  But we need to
 129        * make sure we always fill triangles in that case.
 130        */
 131       fill_mode = SVGA3D_FILLMODE_FILL;
 132    }
 133
 134    SVGA_RETRY(svga, SVGA3D_vgpu10_DefineRasterizerState
 135               (svga->swc,
 136                rast->id,
 137                fill_mode,
 138                cull_mode,
 139                rast->templ.front_ccw,
 140                depth_bias,
 141                depth_bias_clamp,
 142                slope_scaled_depth_bias,
 143                rast->templ.depth_clip_near,
 144                rast->templ.scissor,
 145                rast->templ.multisample,
 146                rast->templ.line_smooth,
 147                line_width,
 148                rast->templ.line_stipple_enable,
 149                line_factor,
 150                line_pattern,
 151                pv_last));
 152 }
 153
 154
 155 static void *
 156 svga_create_rasterizer_state(struct pipe_context *pipe,
 157                              const struct pipe_rasterizer_state *templ)
 158 {
 159    struct svga_context *svga = svga_context(pipe);
 160    struct svga_rasterizer_state *rast = CALLOC_STRUCT(svga_rasterizer_state);
 161    struct svga_screen *screen = svga_screen(pipe->screen);
 162
 163    if (!rast)
 164       return NULL;
 165
 166    /* need this for draw module. */
 167    rast->templ = *templ;
 168
 169    rast->shademode = svga_translate_flatshade(templ->flatshade);
 170    rast->cullmode = svga_translate_cullmode(templ->cull_face, templ->front_ccw);
 171    rast->scissortestenable = templ->scissor;
 172    rast->multisampleantialias = templ->multisample;
 173    rast->antialiasedlineenable = templ->line_smooth;
 174    rast->lastpixel = templ->line_last_pixel;
 175    rast->pointsprite = templ->point_quad_rasterization;
 176
 177    if (rast->templ.multisample) {
 178       /* The OpenGL 3.0 spec says points are always drawn as circles when
 179        * MSAA is enabled.  Note that our implementation isn't 100% correct,
 180        * though.  Our smooth point implementation involves drawing a square,
 181        * computing fragment distance from point center, then attenuating
 182        * the fragment alpha value.  We should not attenuate alpha if msaa
 183        * is enabled.  We should kill fragments entirely outside the circle
 184        * and let the GPU compute per-fragment coverage.
 185        * But as-is, our implementation gives acceptable results and passes
 186        * Piglit's MSAA point smooth test.
 187        */
 188       rast->templ.point_smooth = TRUE;
 189    }
 190
 191    if (rast->templ.point_smooth &&
 192        rast->templ.point_size_per_vertex == 0 &&
 193        rast->templ.point_size <= screen->pointSmoothThreshold) {
 194       /* If the point size is less than the threshold, disable smoothing.
 195        * Note that this only effects point rendering when we use the
 196        * pipe_rasterizer_state::point_size value, not when the point size
 197        * is set in the VS.
 198        */
 199       rast->templ.point_smooth = FALSE;
 200    }
 201
 202    if (rast->templ.point_smooth) {
 203       /* For smooth points we need to generate fragments for at least
 204        * a 2x2 region.  Otherwise the quad we draw may be too small and
 205        * we may generate no fragments at all.
 206        */
 207       rast->pointsize = MAX2(2.0f, templ->point_size);
 208    }
 209    else {
 210       rast->pointsize = templ->point_size;
 211    }
 212
 213    rast->hw_fillmode = PIPE_POLYGON_MODE_FILL;
 214
 215    /* Use swtnl + decomposition implement these:
 216     */
 217
 218    if (templ->line_width <= screen->maxLineWidth) {
 219       /* pass line width to device */
 220       rast->linewidth = MAX2(1.0F, templ->line_width);
 221    }
 222    else if (svga->debug.no_line_width) {
 223       /* nothing */
 224    }
 225    else {
 226       /* use 'draw' pipeline for wide line */
 227       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 228       rast->need_pipeline_lines_str = "line width";
 229    }
 230
 231    if (templ->line_stipple_enable) {
 232       if (screen->haveLineStipple || svga->debug.force_hw_line_stipple) {
 233          SVGA3dLinePattern lp;
 234          lp.repeat = templ->line_stipple_factor + 1;
 235          lp.pattern = templ->line_stipple_pattern;
 236          rast->linepattern = lp.uintValue;
 237       }
 238       else {
 239          /* use 'draw' module to decompose into short line segments */
 240          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 241          rast->need_pipeline_lines_str = "line stipple";
 242       }
 243    }
 244
 245    if (!svga_have_vgpu10(svga) && rast->templ.point_smooth) {
 246       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
 247       rast->need_pipeline_points_str = "smooth points";
 248    }
 249
 250    if (templ->line_smooth && !screen->haveLineSmooth) {
 251       /*
 252        * XXX: Enabling the pipeline slows down performance immensely, so ignore
 253        * line smooth state, where there is very little visual improvement.
 254        * Smooth lines will still be drawn for wide lines.
 255        */
 256 #if 0
 257       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
 258       rast->need_pipeline_lines_str = "smooth lines";
 259 #endif
 260    }
 261
 262    {
 263       int fill_front = templ->fill_front;
 264       int fill_back = templ->fill_back;
 265       int fill = PIPE_POLYGON_MODE_FILL;
 266       boolean offset_front = util_get_offset(templ, fill_front);
 267       boolean offset_back = util_get_offset(templ, fill_back);
 268       boolean offset = FALSE;
 269
 270       switch (templ->cull_face) {
 271       case PIPE_FACE_FRONT_AND_BACK:
 272          offset = FALSE;
 273          fill = PIPE_POLYGON_MODE_FILL;
 274          break;
 275
 276       case PIPE_FACE_FRONT:
 277          offset = offset_back;
 278          fill = fill_back;
 279          break;
 280
 281       case PIPE_FACE_BACK:
 282          offset = offset_front;
 283          fill = fill_front;
 284          break;
 285
 286       case PIPE_FACE_NONE:
 287          if (fill_front != fill_back || offset_front != offset_back) {
 288             /* Always need the draw module to work out different
 289              * front/back fill modes:
 290              */
 291             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 292             rast->need_pipeline_tris_str = "different front/back fillmodes";
 293             fill = PIPE_POLYGON_MODE_FILL;
 294          }
 295          else {
 296             offset = offset_front;
 297             fill = fill_front;
 298          }
 299          break;
 300
 301       default:
 302          assert(0);
 303          break;
 304       }
 305
 306       /* Unfilled primitive modes aren't implemented on all virtual
 307        * hardware.  We can do some unfilled processing with index
 308        * translation, but otherwise need the draw module:
 309        */
 310       if (fill != PIPE_POLYGON_MODE_FILL &&
 311           (templ->flatshade ||
 312            templ->light_twoside ||
 313            offset)) {
 314          fill = PIPE_POLYGON_MODE_FILL;
 315          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 316          rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
 317       }
 318
 319       /* If we are decomposing to lines, and lines need the pipeline,
 320        * then we also need the pipeline for tris.
 321        */
 322       if (fill == PIPE_POLYGON_MODE_LINE &&
 323           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES)) {
 324          fill = PIPE_POLYGON_MODE_FILL;
 325          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 326          rast->need_pipeline_tris_str = "decomposing lines";
 327       }
 328
 329       /* Similarly for points:
 330        */
 331       if (fill == PIPE_POLYGON_MODE_POINT &&
 332           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS)) {
 333          fill = PIPE_POLYGON_MODE_FILL;
 334          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
 335          rast->need_pipeline_tris_str = "decomposing points";
 336       }
 337
 338       if (offset) {
 339          rast->slopescaledepthbias = templ->offset_scale;
 340          rast->depthbias = templ->offset_units;
 341       }
 342
 343       rast->hw_fillmode = fill;
 344    }
 345
 346    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
 347       /* Turn off stuff which will get done in the draw module:
 348        */
 349       rast->hw_fillmode = PIPE_POLYGON_MODE_FILL;
 350       rast->slopescaledepthbias = 0;
 351       rast->depthbias = 0;
 352    }
 353
 354    if (0 && rast->need_pipeline) {
 355       debug_printf("svga: rast need_pipeline = 0x%x\n", rast->need_pipeline);
 356       debug_printf(" pnts: %s \n", rast->need_pipeline_points_str);
 357       debug_printf(" lins: %s \n", rast->need_pipeline_lines_str);
 358       debug_printf(" tris: %s \n", rast->need_pipeline_tris_str);
 359    }
 360
 361    if (svga_have_vgpu10(svga)) {
 362       define_rasterizer_object(svga, rast);
 363    }
 364
 365    if (templ->poly_smooth) {
 366       pipe_debug_message(&svga->debug.callback, CONFORMANCE,
 367                          "GL_POLYGON_SMOOTH not supported");
 368    }
 369
 370    svga->hud.num_rasterizer_objects++;
 371    SVGA_STATS_COUNT_INC(svga_screen(svga->pipe.screen)->sws,
 372                         SVGA_STATS_COUNT_RASTERIZERSTATE);
 373
 374    return rast;
 375 }
 376
 377
 378 static void
 379 svga_bind_rasterizer_state(struct pipe_context *pipe, void *state)
 380 {
 381    struct svga_context *svga = svga_context(pipe);
 382    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
 383
 384    if (!raster || !svga->curr.rast) {
 385       svga->dirty |= SVGA_NEW_STIPPLE | SVGA_NEW_DEPTH_STENCIL_ALPHA;
 386    }
 387    else {
 388       if (raster->templ.poly_stipple_enable !=
 389           svga->curr.rast->templ.poly_stipple_enable) {
 390          svga->dirty |= SVGA_NEW_STIPPLE;
 391       }
 392       if (raster->templ.rasterizer_discard !=
 393           svga->curr.rast->templ.rasterizer_discard) {
 394          svga->dirty |= SVGA_NEW_DEPTH_STENCIL_ALPHA;
 395       }
 396    }
 397
 398    svga->curr.rast = raster;
 399
 400    svga->dirty |= SVGA_NEW_RAST;
 401 }
 402
 403
 404 static void
 405 svga_delete_rasterizer_state(struct pipe_context *pipe, void *state)
 406 {
 407    struct svga_context *svga = svga_context(pipe);
 408    struct svga_rasterizer_state *raster =
 409       (struct svga_rasterizer_state *) state;
 410
 411    if (svga_have_vgpu10(svga)) {
 412       SVGA_RETRY(svga, SVGA3D_vgpu10_DestroyRasterizerState(svga->swc,
 413                                                             raster->id));
 414
 415       if (raster->id == svga->state.hw_draw.rasterizer_id)
 416          svga->state.hw_draw.rasterizer_id = SVGA3D_INVALID_ID;
 417
 418       util_bitmask_clear(svga->rast_object_id_bm, raster->id);
 419    }
 420
 421    FREE(state);
 422    svga->hud.num_rasterizer_objects--;
 423 }
 424
 425
 426 void
 427 svga_init_rasterizer_functions(struct svga_context *svga)
 428 {
 429    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
 430    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
 431    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
 432 }