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