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 "pipe/p_context.h"
  41 #include "pipe/p_defines.h"
  42 #include "cso_cache/cso_context.h"
  43
  44
  45 static GLuint
  46 translate_fill(GLenum mode)
  47 {
  48    switch (mode) {
  49    case GL_POINT:
  50       return PIPE_POLYGON_MODE_POINT;
  51    case GL_LINE:
  52       return PIPE_POLYGON_MODE_LINE;
  53    case GL_FILL:
  54       return PIPE_POLYGON_MODE_FILL;
  55    case GL_FILL_RECTANGLE_NV:
  56       return PIPE_POLYGON_MODE_FILL_RECTANGLE;
  57    default:
  58       assert(0);
  59       return 0;
  60    }
  61 }
  62
  63
  64 void
  65 st_update_rasterizer(struct st_context *st)
  66 {
  67    struct gl_context *ctx = st->ctx;
  68    struct pipe_rasterizer_state *raster = &st->state.rasterizer;
  69    const struct gl_program *vertProg = ctx->VertexProgram._Current;
  70    const struct gl_program *fragProg = ctx->FragmentProgram._Current;
  71
  72    memset(raster, 0, sizeof(*raster));
  73
  74    /* _NEW_POLYGON, _NEW_BUFFERS
  75     */
  76    {
  77       raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
  78
  79       /* _NEW_TRANSFORM */
  80       if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
  81          raster->front_ccw ^= 1;
  82       }
  83
  84       /*
  85        * Gallium's surfaces are Y=0=TOP orientation.  OpenGL is the
  86        * opposite.  Window system surfaces are Y=0=TOP.  Mesa's FBOs
  87        * must match OpenGL conventions so FBOs use Y=0=BOTTOM.  In that
  88        * case, we must invert Y and flip the notion of front vs. back.
  89        */
  90       if (st->state.fb_orientation == Y_0_BOTTOM) {
  91          /* Drawing to an FBO.  The viewport will be inverted. */
  92          raster->front_ccw ^= 1;
  93       }
  94    }
  95
  96    /* _NEW_LIGHT
  97     */
  98    raster->flatshade = ctx->Light.ShadeModel == GL_FLAT;
  99
 100    raster->flatshade_first = ctx->Light.ProvokingVertex ==
 101                              GL_FIRST_VERTEX_CONVENTION_EXT;
 102
 103    /* _NEW_LIGHT | _NEW_PROGRAM */
 104    raster->light_twoside = _mesa_vertex_program_two_side_enabled(ctx);
 105
 106    /*_NEW_LIGHT | _NEW_BUFFERS */
 107    raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
 108                                 ctx->Light._ClampVertexColor;
 109
 110    /* _NEW_POLYGON
 111     */
 112    if (ctx->Polygon.CullFlag) {
 113       switch (ctx->Polygon.CullFaceMode) {
 114       case GL_FRONT:
 115          raster->cull_face = PIPE_FACE_FRONT;
 116          break;
 117       case GL_BACK:
 118          raster->cull_face = PIPE_FACE_BACK;
 119          break;
 120       case GL_FRONT_AND_BACK:
 121          raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
 122          break;
 123       }
 124    }
 125    else {
 126       raster->cull_face = PIPE_FACE_NONE;
 127    }
 128
 129    /* _NEW_POLYGON
 130     */
 131    {
 132       if (ST_DEBUG & DEBUG_WIREFRAME) {
 133          raster->fill_front = PIPE_POLYGON_MODE_LINE;
 134          raster->fill_back = PIPE_POLYGON_MODE_LINE;
 135       }
 136       else {
 137          raster->fill_front = translate_fill(ctx->Polygon.FrontMode);
 138          raster->fill_back = translate_fill(ctx->Polygon.BackMode);
 139       }
 140
 141       /* Simplify when culling is active:
 142        */
 143       if (raster->cull_face & PIPE_FACE_FRONT) {
 144          raster->fill_front = raster->fill_back;
 145       }
 146
 147       if (raster->cull_face & PIPE_FACE_BACK) {
 148          raster->fill_back = raster->fill_front;
 149       }
 150    }
 151
 152    /* _NEW_POLYGON
 153     */
 154    if (ctx->Polygon.OffsetPoint ||
 155        ctx->Polygon.OffsetLine ||
 156        ctx->Polygon.OffsetFill) {
 157       raster->offset_point = ctx->Polygon.OffsetPoint;
 158       raster->offset_line = ctx->Polygon.OffsetLine;
 159       raster->offset_tri = ctx->Polygon.OffsetFill;
 160       raster->offset_units = ctx->Polygon.OffsetUnits;
 161       raster->offset_scale = ctx->Polygon.OffsetFactor;
 162       raster->offset_clamp = ctx->Polygon.OffsetClamp;
 163    }
 164
 165    raster->poly_smooth = ctx->Polygon.SmoothFlag;
 166    raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
 167
 168    /* _NEW_POINT
 169     */
 170    raster->point_size = ctx->Point.Size;
 171    raster->point_smooth = !ctx->Point.PointSprite && ctx->Point.SmoothFlag;
 172
 173    /* _NEW_POINT | _NEW_PROGRAM
 174     */
 175    if (ctx->Point.PointSprite) {
 176       /* origin */
 177       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 178           (st->state.fb_orientation == Y_0_BOTTOM))
 179          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 180       else
 181          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 182
 183       /* Coord replacement flags.  If bit 'k' is set that means
 184        * that we need to replace GENERIC[k] attrib with an automatically
 185        * computed texture coord.
 186        */
 187       raster->sprite_coord_enable = ctx->Point.CoordReplace &
 188          ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
 189       if (!st->needs_texcoord_semantic &&
 190           fragProg->info.inputs_read & VARYING_BIT_PNTC) {
 191          raster->sprite_coord_enable |=
 192             1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
 193       }
 194
 195       raster->point_quad_rasterization = 1;
 196    }
 197
 198    /* ST_NEW_VERTEX_PROGRAM
 199     */
 200    if (vertProg) {
 201       if (vertProg->Id == 0) {
 202          if (vertProg->info.outputs_written &
 203              BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
 204             /* generated program which emits point size */
 205             raster->point_size_per_vertex = TRUE;
 206          }
 207       }
 208       else if (ctx->API != API_OPENGLES2) {
 209          /* PointSizeEnabled is always set in ES2 contexts */
 210          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 211       }
 212       else {
 213          /* ST_NEW_TESSEVAL_PROGRAM | ST_NEW_GEOMETRY_PROGRAM */
 214          /* We have to check the last bound stage and see if it writes psize */
 215          struct gl_program *last = NULL;
 216          if (ctx->GeometryProgram._Current)
 217             last = ctx->GeometryProgram._Current;
 218          else if (ctx->TessEvalProgram._Current)
 219             last = ctx->TessEvalProgram._Current;
 220          else if (ctx->VertexProgram._Current)
 221             last = ctx->VertexProgram._Current;
 222          if (last)
 223             raster->point_size_per_vertex =
 224                !!(last->info.outputs_written &
 225                   BITFIELD64_BIT(VARYING_SLOT_PSIZ));
 226       }
 227    }
 228    if (!raster->point_size_per_vertex) {
 229       /* clamp size now */
 230       raster->point_size = CLAMP(ctx->Point.Size,
 231                                  ctx->Point.MinSize,
 232                                  ctx->Point.MaxSize);
 233    }
 234
 235    /* _NEW_LINE
 236     */
 237    raster->line_smooth = ctx->Line.SmoothFlag;
 238    if (ctx->Line.SmoothFlag) {
 239       raster->line_width = CLAMP(ctx->Line.Width,
 240                                  ctx->Const.MinLineWidthAA,
 241                                  ctx->Const.MaxLineWidthAA);
 242    }
 243    else {
 244       raster->line_width = CLAMP(ctx->Line.Width,
 245                                  ctx->Const.MinLineWidth,
 246                                  ctx->Const.MaxLineWidth);
 247    }
 248
 249    raster->line_stipple_enable = ctx->Line.StippleFlag;
 250    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 251    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 252    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 253
 254    /* _NEW_MULTISAMPLE */
 255    raster->multisample = _mesa_is_multisample_enabled(ctx);
 256
 257    /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
 258    raster->force_persample_interp =
 259          !st->force_persample_in_shader &&
 260          raster->multisample &&
 261          ctx->Multisample.SampleShading &&
 262          ctx->Multisample.MinSampleShadingValue *
 263          _mesa_geometric_samples(ctx->DrawBuffer) > 1;
 264
 265    /* _NEW_SCISSOR */
 266    raster->scissor = !!ctx->Scissor.EnableFlags;
 267
 268    /* _NEW_FRAG_CLAMP */
 269    raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
 270                                   ctx->Color._ClampFragmentColor;
 271
 272    raster->half_pixel_center = 1;
 273    if (st->state.fb_orientation == Y_0_TOP)
 274       raster->bottom_edge_rule = 1;
 275
 276    /* _NEW_TRANSFORM */
 277    if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
 278       raster->bottom_edge_rule ^= 1;
 279
 280    /* ST_NEW_RASTERIZER */
 281    raster->rasterizer_discard = ctx->RasterDiscard;
 282    if (ctx->TileRasterOrderFixed) {
 283       raster->tile_raster_order_fixed = true;
 284       raster->tile_raster_order_increasing_x = ctx->TileRasterOrderIncreasingX;
 285       raster->tile_raster_order_increasing_y = ctx->TileRasterOrderIncreasingY;
 286    }
 287
 288    if (st->edgeflag_culls_prims) {
 289       /* All edge flags are FALSE. Cull the affected faces. */
 290       if (raster->fill_front != PIPE_POLYGON_MODE_FILL)
 291          raster->cull_face |= PIPE_FACE_FRONT;
 292       if (raster->fill_back != PIPE_POLYGON_MODE_FILL)
 293          raster->cull_face |= PIPE_FACE_BACK;
 294    }
 295
 296    /* _NEW_TRANSFORM */
 297    raster->depth_clip = !ctx->Transform.DepthClamp;
 298    raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
 299    raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
 300
 301     /* ST_NEW_RASTERIZER */
 302    if (ctx->ConservativeRasterization) {
 303       if (ctx->ConservativeRasterMode == GL_CONSERVATIVE_RASTER_MODE_POST_SNAP_NV)
 304          raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
 305       else
 306          raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_PRE_SNAP;
 307    } else {
 308       raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_OFF;
 309    }
 310
 311    raster->conservative_raster_dilate = ctx->ConservativeRasterDilate;
 312
 313    raster->subpixel_precision_x = ctx->SubpixelPrecisionBias[0];
 314    raster->subpixel_precision_y = ctx->SubpixelPrecisionBias[1];
 315
 316    cso_set_rasterizer(st->cso_context, raster);
 317 }