src/mesa/state_tracker/st_atom_rasterizer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 <keith@tungstengraphics.com>
  31   */
  32
  33 #include "main/macros.h"
  34 #include "st_context.h"
  35 #include "st_atom.h"
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_defines.h"
  38 #include "cso_cache/cso_context.h"
  39
  40
  41 static GLuint translate_fill( GLenum mode )
  42 {
  43    switch (mode) {
  44    case GL_POINT:
  45       return PIPE_POLYGON_MODE_POINT;
  46    case GL_LINE:
  47       return PIPE_POLYGON_MODE_LINE;
  48    case GL_FILL:
  49       return PIPE_POLYGON_MODE_FILL;
  50    default:
  51       assert(0);
  52       return 0;
  53    }
  54 }
  55
  56
  57
  58 static void update_raster_state( struct st_context *st )
  59 {
  60    struct gl_context *ctx = st->ctx;
  61    struct pipe_rasterizer_state *raster = &st->state.rasterizer;
  62    const struct gl_vertex_program *vertProg = ctx->VertexProgram._Current;
  63    const struct gl_fragment_program *fragProg = ctx->FragmentProgram._Current;
  64    uint i;
  65
  66    memset(raster, 0, sizeof(*raster));
  67
  68    /* _NEW_POLYGON, _NEW_BUFFERS
  69     */
  70    {
  71       raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
  72
  73       /*
  74        * Gallium's surfaces are Y=0=TOP orientation.  OpenGL is the
  75        * opposite.  Window system surfaces are Y=0=TOP.  Mesa's FBOs
  76        * must match OpenGL conventions so FBOs use Y=0=BOTTOM.  In that
  77        * case, we must invert Y and flip the notion of front vs. back.
  78        */
  79       if (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM) {
  80          /* Drawing to an FBO.  The viewport will be inverted. */
  81          raster->front_ccw ^= 1;
  82       }
  83    }
  84
  85    /* _NEW_LIGHT
  86     */
  87    if (ctx->Light.ShadeModel == GL_FLAT)
  88       raster->flatshade = 1;
  89
  90    if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION_EXT)
  91       raster->flatshade_first = 1;
  92
  93    /* _NEW_LIGHT | _NEW_PROGRAM
  94     *
  95     * Back-face colors can come from traditional lighting (when
  96     * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs/shaders (when
  97     * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
  98     */
  99    if (ctx->VertexProgram._Current) {
 100       if (ctx->VertexProgram._Enabled ||
 101           (ctx->Shader.CurrentVertexProgram &&
 102            ctx->Shader.CurrentVertexProgram->LinkStatus)) {
 103          /* user-defined vertex program or shader */
 104          raster->light_twoside = ctx->VertexProgram.TwoSideEnabled;
 105       }
 106       else {
 107          /* TNL-generated program */
 108          raster->light_twoside = ctx->Light.Enabled && ctx->Light.Model.TwoSide;
 109       }
 110    }
 111    else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
 112       raster->light_twoside = 1;
 113    }
 114
 115    /* _NEW_POLYGON
 116     */
 117    if (ctx->Polygon.CullFlag) {
 118       switch (ctx->Polygon.CullFaceMode) {
 119       case GL_FRONT:
 120          raster->cull_face = PIPE_FACE_FRONT;
 121          break;
 122       case GL_BACK:
 123          raster->cull_face = PIPE_FACE_BACK;
 124          break;
 125       case GL_FRONT_AND_BACK:
 126          raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
 127          break;
 128       }
 129    }
 130    else {
 131       raster->cull_face = PIPE_FACE_NONE;
 132    }
 133
 134    /* _NEW_POLYGON
 135     */
 136    {
 137       raster->fill_front = translate_fill( ctx->Polygon.FrontMode );
 138       raster->fill_back = translate_fill( ctx->Polygon.BackMode );
 139
 140       /* Simplify when culling is active:
 141        */
 142       if (raster->cull_face & PIPE_FACE_FRONT) {
 143          raster->fill_front = raster->fill_back;
 144       }
 145
 146       if (raster->cull_face & PIPE_FACE_BACK) {
 147          raster->fill_back = raster->fill_front;
 148       }
 149    }
 150
 151    /* _NEW_POLYGON
 152     */
 153    if (ctx->Polygon.OffsetUnits != 0.0 ||
 154        ctx->Polygon.OffsetFactor != 0.0) {
 155       raster->offset_point = ctx->Polygon.OffsetPoint;
 156       raster->offset_line = ctx->Polygon.OffsetLine;
 157       raster->offset_tri = ctx->Polygon.OffsetFill;
 158    }
 159
 160    if (ctx->Polygon.OffsetPoint ||
 161        ctx->Polygon.OffsetLine ||
 162        ctx->Polygon.OffsetFill) {
 163       raster->offset_units = ctx->Polygon.OffsetUnits;
 164       raster->offset_scale = ctx->Polygon.OffsetFactor;
 165    }
 166
 167    if (ctx->Polygon.SmoothFlag)
 168       raster->poly_smooth = 1;
 169
 170    if (ctx->Polygon.StippleFlag)
 171       raster->poly_stipple_enable = 1;
 172
 173    /* _NEW_POINT
 174     */
 175    raster->point_size = ctx->Point.Size;
 176
 177    if (!ctx->Point.PointSprite && ctx->Point.SmoothFlag)
 178       raster->point_smooth = 1;
 179
 180    /* _NEW_POINT | _NEW_PROGRAM
 181     */
 182    if (ctx->Point.PointSprite) {
 183       /* origin */
 184       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 185           (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))
 186          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 187       else
 188          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 189
 190       /* Coord replacement flags.  If bit 'k' is set that means
 191        * that we need to replace GENERIC[k] attrib with an automatically
 192        * computed texture coord.
 193        */
 194       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 195          if (ctx->Point.CoordReplace[i]) {
 196             raster->sprite_coord_enable |= 1 << i;
 197          }
 198       }
 199       if (fragProg->Base.InputsRead & FRAG_BIT_PNTC) {
 200          raster->sprite_coord_enable |=
 201             1 << (FRAG_ATTRIB_PNTC - FRAG_ATTRIB_TEX0);
 202       }
 203
 204       raster->point_quad_rasterization = 1;
 205    }
 206
 207    /* ST_NEW_VERTEX_PROGRAM
 208     */
 209    if (vertProg) {
 210       if (vertProg->Base.Id == 0) {
 211          if (vertProg->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_PSIZ)) {
 212             /* generated program which emits point size */
 213             raster->point_size_per_vertex = TRUE;
 214          }
 215       }
 216       else if (ctx->VertexProgram.PointSizeEnabled) {
 217          /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
 218          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 219       }
 220    }
 221    if (!raster->point_size_per_vertex) {
 222       /* clamp size now */
 223       raster->point_size = CLAMP(ctx->Point.Size,
 224                                  ctx->Point.MinSize,
 225                                  ctx->Point.MaxSize);
 226    }
 227
 228    /* _NEW_LINE
 229     */
 230    raster->line_smooth = ctx->Line.SmoothFlag;
 231    if (ctx->Line.SmoothFlag) {
 232       raster->line_width = CLAMP(ctx->Line.Width,
 233                                 ctx->Const.MinLineWidthAA,
 234                                 ctx->Const.MaxLineWidthAA);
 235    }
 236    else {
 237       raster->line_width = CLAMP(ctx->Line.Width,
 238                                 ctx->Const.MinLineWidth,
 239                                 ctx->Const.MaxLineWidth);
 240    }
 241
 242    raster->line_stipple_enable = ctx->Line.StippleFlag;
 243    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 244    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 245    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 246
 247    /* _NEW_MULTISAMPLE */
 248    if (ctx->Multisample._Enabled || st->force_msaa)
 249       raster->multisample = 1;
 250
 251    /* _NEW_SCISSOR */
 252    if (ctx->Scissor.Enabled)
 253       raster->scissor = 1;
 254
 255    raster->gl_rasterization_rules = 1;
 256
 257    cso_set_rasterizer(st->cso_context, raster);
 258 }
 259
 260 const struct st_tracked_state st_update_rasterizer = {
 261    "st_update_rasterizer",    /* name */
 262    {
 263       (_NEW_BUFFERS |
 264        _NEW_LIGHT |
 265        _NEW_LINE |
 266        _NEW_MULTISAMPLE |
 267        _NEW_POINT |
 268        _NEW_POLYGON |
 269        _NEW_PROGRAM |
 270        _NEW_SCISSOR),      /* mesa state dependencies*/
 271       ST_NEW_VERTEX_PROGRAM,  /* state tracker dependencies */
 272    },
 273    update_raster_state     /* update function */
 274 };