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