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 static GLboolean get_offset_flag( GLuint fill_mode,
  57                                   const struct gl_polygon_attrib *p )
  58 {
  59    switch (fill_mode) {
  60    case PIPE_POLYGON_MODE_POINT:
  61       return p->OffsetPoint;
  62    case PIPE_POLYGON_MODE_LINE:
  63       return p->OffsetLine;
  64    case PIPE_POLYGON_MODE_FILL:
  65       return p->OffsetFill;
  66    default:
  67       assert(0);
  68       return 0;
  69    }
  70 }
  71
  72
  73 static void update_raster_state( struct st_context *st )
  74 {
  75    GLcontext *ctx = st->ctx;
  76    struct pipe_rasterizer_state *raster = &st->state.rasterizer;
  77    const struct gl_vertex_program *vertProg = ctx->VertexProgram._Current;
  78    uint i;
  79
  80    memset(raster, 0, sizeof(*raster));
  81
  82    raster->origin_lower_left = 1; /* Always true for OpenGL */
  83
  84    /* _NEW_POLYGON, _NEW_BUFFERS
  85     */
  86    {
  87       if (ctx->Polygon.FrontFace == GL_CCW)
  88          raster->front_winding = PIPE_WINDING_CCW;
  89       else
  90          raster->front_winding = PIPE_WINDING_CW;
  91
  92       /* XXX
  93        * I think the intention here is that user-created framebuffer objects
  94        * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
  95        * Flipping Y changes CW to CCW and vice-versa.
  96        * But this is an implementation/driver-specific artifact - remove...
  97        */
  98       if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
  99          raster->front_winding ^= PIPE_WINDING_BOTH;
 100    }
 101
 102    /* _NEW_LIGHT
 103     */
 104    if (ctx->Light.ShadeModel == GL_FLAT)
 105       raster->flatshade = 1;
 106
 107    /* _NEW_LIGHT | _NEW_PROGRAM
 108     *
 109     * Back-face colors can come from traditional lighting (when
 110     * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs/shaders (when
 111     * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
 112     */
 113    if (ctx->VertexProgram._Current) {
 114       if (ctx->VertexProgram._Enabled ||
 115           (ctx->Shader.CurrentProgram &&
 116            ctx->Shader.CurrentProgram->VertexProgram &&
 117            ctx->Shader.CurrentProgram->LinkStatus)) {
 118          /* user-defined vertex program or shader */
 119          raster->light_twoside = ctx->VertexProgram.TwoSideEnabled;
 120       }
 121       else {
 122          /* TNL-generated program */
 123          raster->light_twoside = ctx->Light.Enabled && ctx->Light.Model.TwoSide;
 124       }
 125    }
 126    else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
 127       raster->light_twoside = 1;
 128    }
 129
 130    /* _NEW_POLYGON
 131     */
 132    if (ctx->Polygon.CullFlag) {
 133       if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
 134          raster->cull_mode = PIPE_WINDING_BOTH;
 135       }
 136       else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
 137          raster->cull_mode = raster->front_winding;
 138       }
 139       else {
 140          raster->cull_mode = raster->front_winding ^ PIPE_WINDING_BOTH;
 141       }
 142    }
 143
 144    /* _NEW_POLYGON
 145     */
 146    {
 147       GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
 148       GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
 149
 150       if (raster->front_winding == PIPE_WINDING_CW) {
 151          raster->fill_cw = fill_front;
 152          raster->fill_ccw = fill_back;
 153       }
 154       else {
 155          raster->fill_cw = fill_back;
 156          raster->fill_ccw = fill_front;
 157       }
 158
 159       /* Simplify when culling is active:
 160        */
 161       if (raster->cull_mode & PIPE_WINDING_CW) {
 162          raster->fill_cw = raster->fill_ccw;
 163       }
 164
 165       if (raster->cull_mode & PIPE_WINDING_CCW) {
 166          raster->fill_ccw = raster->fill_cw;
 167       }
 168    }
 169
 170    /* _NEW_POLYGON
 171     */
 172    if (ctx->Polygon.OffsetUnits != 0.0 ||
 173        ctx->Polygon.OffsetFactor != 0.0) {
 174       raster->offset_cw = get_offset_flag( raster->fill_cw, &ctx->Polygon );
 175       raster->offset_ccw = get_offset_flag( raster->fill_ccw, &ctx->Polygon );
 176       raster->offset_units = ctx->Polygon.OffsetUnits;
 177       raster->offset_scale = ctx->Polygon.OffsetFactor;
 178    }
 179
 180    if (ctx->Polygon.SmoothFlag)
 181       raster->poly_smooth = 1;
 182
 183    if (ctx->Polygon.StippleFlag)
 184       raster->poly_stipple_enable = 1;
 185
 186
 187    /* _NEW_BUFFERS, _NEW_POLYGON
 188     */
 189    if (raster->fill_cw != PIPE_POLYGON_MODE_FILL ||
 190        raster->fill_ccw != PIPE_POLYGON_MODE_FILL)
 191    {
 192       GLfloat mrd = (ctx->DrawBuffer ?
 193                      ctx->DrawBuffer->_MRD :
 194                      1.0f);
 195
 196       raster->offset_units = ctx->Polygon.OffsetFactor * mrd;
 197       raster->offset_scale = (ctx->Polygon.OffsetUnits * mrd *
 198                             st->polygon_offset_scale);
 199    }
 200
 201    /* _NEW_POINT
 202     */
 203    raster->point_size = ctx->Point.Size;
 204
 205    raster->point_size_min = 0;    /* temporary, will go away */
 206    raster->point_size_max = 1000; /* temporary, will go away */
 207
 208    raster->point_smooth = ctx->Point.SmoothFlag;
 209    raster->point_sprite = ctx->Point.PointSprite;
 210    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 211       if (ctx->Point.CoordReplace[i]) {
 212          if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
 213             raster->sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
 214          else
 215             raster->sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
 216       }
 217       else {
 218          raster->sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
 219       }
 220    }
 221
 222    /* ST_NEW_VERTEX_PROGRAM
 223     */
 224    if (vertProg) {
 225       if (vertProg->Base.Id == 0) {
 226          if (vertProg->Base.OutputsWritten & (1 << VERT_RESULT_PSIZ)) {
 227             /* generated program which emits point size */
 228             raster->point_size_per_vertex = TRUE;
 229          }
 230       }
 231       else if (ctx->VertexProgram.PointSizeEnabled) {
 232          /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
 233          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 234       }
 235    }
 236    if (!raster->point_size_per_vertex) {
 237       /* clamp size now */
 238       raster->point_size = CLAMP(ctx->Point.Size,
 239                                  ctx->Point.MinSize,
 240                                  ctx->Point.MaxSize);
 241    }
 242
 243    /* _NEW_LINE
 244     */
 245    raster->line_smooth = ctx->Line.SmoothFlag;
 246    if (ctx->Line.SmoothFlag) {
 247       raster->line_width = CLAMP(ctx->Line.Width,
 248                                 ctx->Const.MinLineWidthAA,
 249                                 ctx->Const.MaxLineWidthAA);
 250    }
 251    else {
 252       raster->line_width = CLAMP(ctx->Line.Width,
 253                                 ctx->Const.MinLineWidth,
 254                                 ctx->Const.MaxLineWidth);
 255    }
 256
 257    raster->line_stipple_enable = ctx->Line.StippleFlag;
 258    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 259    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 260    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 261
 262    /* _NEW_MULTISAMPLE */
 263    if (ctx->Multisample._Enabled || st->force_msaa)
 264       raster->multisample = 1;
 265
 266    /* _NEW_SCISSOR */
 267    if (ctx->Scissor.Enabled)
 268       raster->scissor = 1;
 269
 270    raster->gl_rasterization_rules = 1;
 271
 272    cso_set_rasterizer(st->cso_context, raster);
 273 }
 274
 275 const struct st_tracked_state st_update_rasterizer = {
 276    "st_update_rasterizer",    /* name */
 277    {
 278       (_NEW_BUFFERS |
 279        _NEW_LIGHT |
 280        _NEW_LINE |
 281        _NEW_MULTISAMPLE |
 282        _NEW_POINT |
 283        _NEW_POLYGON |
 284        _NEW_PROGRAM |
 285        _NEW_SCISSOR),      /* mesa state dependencies*/
 286       ST_NEW_VERTEX_PROGRAM,  /* state tracker dependencies */
 287    },
 288    update_raster_state     /* update function */
 289 };