src/mesa/state_tracker/st_atom_rasterizer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keithw@vmware.com>
  31   */
  32
  33 #include "main/macros.h"
  34 #include "main/framebuffer.h"
  35 #include "main/state.h"
  36 #include "st_context.h"
  37 #include "st_atom.h"
  38 #include "st_debug.h"
  39 #include "st_program.h"
  40 #include "st_util.h"
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43 #include "cso_cache/cso_context.h"
  44
  45
  46 static GLuint
  47 translate_fill(GLenum mode)
  48 {
  49    switch (mode) {
  50    case GL_POINT:
  51       return PIPE_POLYGON_MODE_POINT;
  52    case GL_LINE:
  53       return PIPE_POLYGON_MODE_LINE;
  54    case GL_FILL:
  55       return PIPE_POLYGON_MODE_FILL;
  56    case GL_FILL_RECTANGLE_NV:
  57       return PIPE_POLYGON_MODE_FILL_RECTANGLE;
  58    default:
  59       assert(0);
  60       return 0;
  61    }
  62 }
  63
  64
  65 void
  66 st_update_rasterizer(struct st_context *st)
  67 {
  68    struct gl_context *ctx = st->ctx;
  69    struct pipe_rasterizer_state *raster = &st->state.rasterizer;
  70    const struct gl_program *vertProg = ctx->VertexProgram._Current;
  71    const struct gl_program *fragProg = ctx->FragmentProgram._Current;
  72
  73    memset(raster, 0, sizeof(*raster));
  74
  75    /* _NEW_POLYGON, _NEW_BUFFERS
  76     */
  77    {
  78       raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
  79
  80       /* _NEW_TRANSFORM */
  81       if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
  82          raster->front_ccw ^= 1;
  83       }
  84
  85       /*
  86        * Gallium's surfaces are Y=0=TOP orientation.  OpenGL is the
  87        * opposite.  Window system surfaces are Y=0=TOP.  Mesa's FBOs
  88        * must match OpenGL conventions so FBOs use Y=0=BOTTOM.  In that
  89        * case, we must invert Y and flip the notion of front vs. back.
  90        */
  91       if (st->state.fb_orientation == Y_0_BOTTOM) {
  92          /* Drawing to an FBO.  The viewport will be inverted. */
  93          raster->front_ccw ^= 1;
  94       }
  95    }
  96
  97    /* _NEW_LIGHT
  98     */
  99    raster->flatshade = ctx->Light.ShadeModel == GL_FLAT;
 100
 101    raster->flatshade_first = ctx->Light.ProvokingVertex ==
 102                              GL_FIRST_VERTEX_CONVENTION_EXT;
 103
 104    /* _NEW_LIGHT | _NEW_PROGRAM */
 105    raster->light_twoside = _mesa_vertex_program_two_side_enabled(ctx);
 106
 107    /*_NEW_LIGHT | _NEW_BUFFERS */
 108    raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
 109                                 ctx->Light._ClampVertexColor;
 110
 111    /* _NEW_POLYGON
 112     */
 113    if (ctx->Polygon.CullFlag) {
 114       switch (ctx->Polygon.CullFaceMode) {
 115       case GL_FRONT:
 116          raster->cull_face = PIPE_FACE_FRONT;
 117          break;
 118       case GL_BACK:
 119          raster->cull_face = PIPE_FACE_BACK;
 120          break;
 121       case GL_FRONT_AND_BACK:
 122          raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
 123          break;
 124       }
 125    }
 126    else {
 127       raster->cull_face = PIPE_FACE_NONE;
 128    }
 129
 130    /* _NEW_POLYGON
 131     */
 132    {
 133       if (ST_DEBUG & DEBUG_WIREFRAME) {
 134          raster->fill_front = PIPE_POLYGON_MODE_LINE;
 135          raster->fill_back = PIPE_POLYGON_MODE_LINE;
 136       }
 137       else {
 138          raster->fill_front = translate_fill(ctx->Polygon.FrontMode);
 139          raster->fill_back = translate_fill(ctx->Polygon.BackMode);
 140       }
 141
 142       /* Simplify when culling is active:
 143        */
 144       if (raster->cull_face & PIPE_FACE_FRONT) {
 145          raster->fill_front = raster->fill_back;
 146       }
 147
 148       if (raster->cull_face & PIPE_FACE_BACK) {
 149          raster->fill_back = raster->fill_front;
 150       }
 151    }
 152
 153    /* _NEW_POLYGON
 154     */
 155    if (ctx->Polygon.OffsetPoint ||
 156        ctx->Polygon.OffsetLine ||
 157        ctx->Polygon.OffsetFill) {
 158       raster->offset_point = ctx->Polygon.OffsetPoint;
 159       raster->offset_line = ctx->Polygon.OffsetLine;
 160       raster->offset_tri = ctx->Polygon.OffsetFill;
 161       raster->offset_units = ctx->Polygon.OffsetUnits;
 162       raster->offset_scale = ctx->Polygon.OffsetFactor;
 163       raster->offset_clamp = ctx->Polygon.OffsetClamp;
 164    }
 165
 166    raster->poly_smooth = ctx->Polygon.SmoothFlag;
 167    raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
 168
 169    /* _NEW_POINT
 170     */
 171    raster->point_size = ctx->Point.Size;
 172    raster->point_smooth = !ctx->Point.PointSprite && ctx->Point.SmoothFlag;
 173
 174    /* _NEW_POINT | _NEW_PROGRAM
 175     */
 176    if (ctx->Point.PointSprite) {
 177       /* origin */
 178       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 179           (st->state.fb_orientation == Y_0_BOTTOM))
 180          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 181       else
 182          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 183
 184       /* Coord replacement flags.  If bit 'k' is set that means
 185        * that we need to replace GENERIC[k] attrib with an automatically
 186        * computed texture coord.
 187        */
 188       raster->sprite_coord_enable = ctx->Point.CoordReplace &
 189          ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
 190       if (!st->needs_texcoord_semantic &&
 191           fragProg->info.inputs_read & VARYING_BIT_PNTC) {
 192          raster->sprite_coord_enable |=
 193             1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
 194       }
 195
 196       raster->point_quad_rasterization = 1;
 197    }
 198
 199    /* ST_NEW_VERTEX_PROGRAM
 200     */
 201    if (vertProg) {
 202       if (vertProg->Id == 0) {
 203          if (vertProg->info.outputs_written &
 204              BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
 205             /* generated program which emits point size */
 206             raster->point_size_per_vertex = TRUE;
 207          }
 208       }
 209       else if (ctx->API != API_OPENGLES2) {
 210          /* PointSizeEnabled is always set in ES2 contexts */
 211          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 212       }
 213       else {
 214          /* ST_NEW_TESSEVAL_PROGRAM | ST_NEW_GEOMETRY_PROGRAM */
 215          /* We have to check the last bound stage and see if it writes psize */
 216          struct gl_program *last = NULL;
 217          if (ctx->GeometryProgram._Current)
 218             last = ctx->GeometryProgram._Current;
 219          else if (ctx->TessEvalProgram._Current)
 220             last = ctx->TessEvalProgram._Current;
 221          else if (ctx->VertexProgram._Current)
 222             last = ctx->VertexProgram._Current;
 223          if (last)
 224             raster->point_size_per_vertex =
 225                !!(last->info.outputs_written &
 226                   BITFIELD64_BIT(VARYING_SLOT_PSIZ));
 227       }
 228    }
 229    if (!raster->point_size_per_vertex) {
 230       /* clamp size now */
 231       raster->point_size = CLAMP(ctx->Point.Size,
 232                                  ctx->Point.MinSize,
 233                                  ctx->Point.MaxSize);
 234    }
 235
 236    /* _NEW_LINE
 237     */
 238    raster->line_smooth = ctx->Line.SmoothFlag;
 239    if (ctx->Line.SmoothFlag) {
 240       raster->line_width = CLAMP(ctx->Line.Width,
 241                                  ctx->Const.MinLineWidthAA,
 242                                  ctx->Const.MaxLineWidthAA);
 243    }
 244    else {
 245       raster->line_width = CLAMP(ctx->Line.Width,
 246                                  ctx->Const.MinLineWidth,
 247                                  ctx->Const.MaxLineWidth);
 248    }
 249
 250    raster->line_stipple_enable = ctx->Line.StippleFlag;
 251    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 252    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 253    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 254
 255    /* _NEW_MULTISAMPLE */
 256    raster->multisample = _mesa_is_multisample_enabled(ctx);
 257
 258    /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
 259    raster->force_persample_interp =
 260          !st->force_persample_in_shader &&
 261          raster->multisample &&
 262          ctx->Multisample.SampleShading &&
 263          ctx->Multisample.MinSampleShadingValue *
 264          _mesa_geometric_samples(ctx->DrawBuffer) > 1;
 265
 266    /* _NEW_SCISSOR */
 267    raster->scissor = !!ctx->Scissor.EnableFlags;
 268
 269    /* _NEW_FRAG_CLAMP */
 270    raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
 271                                   ctx->Color._ClampFragmentColor;
 272
 273    raster->half_pixel_center = 1;
 274    if (st->state.fb_orientation == Y_0_TOP)
 275       raster->bottom_edge_rule = 1;
 276
 277    /* _NEW_TRANSFORM */
 278    if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
 279       raster->bottom_edge_rule ^= 1;
 280
 281    /* ST_NEW_RASTERIZER */
 282    raster->rasterizer_discard = ctx->RasterDiscard;
 283    if (ctx->TileRasterOrderFixed) {
 284       raster->tile_raster_order_fixed = true;
 285       raster->tile_raster_order_increasing_x = ctx->TileRasterOrderIncreasingX;
 286       raster->tile_raster_order_increasing_y = ctx->TileRasterOrderIncreasingY;
 287    }
 288
 289    if (st->edgeflag_culls_prims) {
 290       /* All edge flags are FALSE. Cull the affected faces. */
 291       if (raster->fill_front != PIPE_POLYGON_MODE_FILL)
 292          raster->cull_face |= PIPE_FACE_FRONT;
 293       if (raster->fill_back != PIPE_POLYGON_MODE_FILL)
 294          raster->cull_face |= PIPE_FACE_BACK;
 295    }
 296
 297    /* _NEW_TRANSFORM */
 298    raster->depth_clip_near = st->clamp_frag_depth_in_shader ||
 299                              !ctx->Transform.DepthClampNear;
 300    raster->depth_clip_far = st->clamp_frag_depth_in_shader ||
 301                             !ctx->Transform.DepthClampFar;
 302    raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
 303    raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
 304
 305     /* ST_NEW_RASTERIZER */
 306    if (ctx->ConservativeRasterization) {
 307       if (ctx->ConservativeRasterMode == GL_CONSERVATIVE_RASTER_MODE_POST_SNAP_NV)
 308          raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
 309       else
 310          raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_PRE_SNAP;
 311    } else if (ctx->IntelConservativeRasterization) {
 312       raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
 313    } else {
 314       raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_OFF;
 315    }
 316
 317    raster->conservative_raster_dilate = ctx->ConservativeRasterDilate;
 318
 319    raster->subpixel_precision_x = ctx->SubpixelPrecisionBias[0];
 320    raster->subpixel_precision_y = ctx->SubpixelPrecisionBias[1];
 321
 322    cso_set_rasterizer(st->cso_context, raster);
 323 }