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