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