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    GLcontext *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       /* XXX
  74        * I think the intention here is that user-created framebuffer objects
  75        * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
  76        * Flipping Y changes CW to CCW and vice-versa.
  77        * But this is an implementation/driver-specific artifact - remove...
  78        */
  79       if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
  80          raster->front_ccw ^= 1;
  81    }
  82
  83    /* _NEW_LIGHT
  84     */
  85    if (ctx->Light.ShadeModel == GL_FLAT)
  86       raster->flatshade = 1;
  87
  88    if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION_EXT)
  89       raster->flatshade_first = 1;
  90
  91    /* _NEW_LIGHT | _NEW_PROGRAM
  92     *
  93     * Back-face colors can come from traditional lighting (when
  94     * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs/shaders (when
  95     * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
  96     */
  97    if (ctx->VertexProgram._Current) {
  98       if (ctx->VertexProgram._Enabled ||
  99           (ctx->Shader.CurrentProgram &&
 100            ctx->Shader.CurrentProgram->VertexProgram &&
 101            ctx->Shader.CurrentProgram->LinkStatus)) {
 102          /* user-defined vertex program or shader */
 103          raster->light_twoside = ctx->VertexProgram.TwoSideEnabled;
 104       }
 105       else {
 106          /* TNL-generated program */
 107          raster->light_twoside = ctx->Light.Enabled && ctx->Light.Model.TwoSide;
 108       }
 109    }
 110    else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
 111       raster->light_twoside = 1;
 112    }
 113
 114    /* _NEW_POLYGON
 115     */
 116    if (ctx->Polygon.CullFlag) {
 117       switch (ctx->Polygon.CullFaceMode) {
 118       case GL_FRONT:
 119          raster->cull_face = PIPE_FACE_FRONT;
 120          break;
 121       case GL_BACK:
 122          raster->cull_face = PIPE_FACE_BACK;
 123          break;
 124       case GL_FRONT_AND_BACK:
 125          raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
 126          break;
 127       }
 128    }
 129    else {
 130       raster->cull_face = PIPE_FACE_NONE;
 131    }
 132
 133    /* _NEW_POLYGON
 134     */
 135    {
 136       raster->fill_front = translate_fill( ctx->Polygon.FrontMode );
 137       raster->fill_back = translate_fill( ctx->Polygon.BackMode );
 138
 139       /* Simplify when culling is active:
 140        */
 141       if (raster->cull_face & PIPE_FACE_FRONT) {
 142          raster->fill_front = raster->fill_back;
 143       }
 144
 145       if (raster->cull_face & PIPE_FACE_BACK) {
 146          raster->fill_back = raster->fill_front;
 147       }
 148    }
 149
 150    /* _NEW_POLYGON
 151     */
 152    if (ctx->Polygon.OffsetUnits != 0.0 ||
 153        ctx->Polygon.OffsetFactor != 0.0) {
 154       raster->offset_point = ctx->Polygon.OffsetPoint;
 155       raster->offset_line = ctx->Polygon.OffsetLine;
 156       raster->offset_tri = ctx->Polygon.OffsetFill;
 157    }
 158
 159    if (ctx->Polygon.OffsetPoint ||
 160        ctx->Polygon.OffsetLine ||
 161        ctx->Polygon.OffsetFill) {
 162       raster->offset_units = ctx->Polygon.OffsetUnits;
 163       raster->offset_scale = ctx->Polygon.OffsetFactor;
 164    }
 165
 166    if (ctx->Polygon.SmoothFlag)
 167       raster->poly_smooth = 1;
 168
 169    if (ctx->Polygon.StippleFlag)
 170       raster->poly_stipple_enable = 1;
 171
 172    /* _NEW_POINT
 173     */
 174    raster->point_size = ctx->Point.Size;
 175
 176    if (!ctx->Point.PointSprite && ctx->Point.SmoothFlag)
 177       raster->point_smooth = 1;
 178
 179    /* _NEW_POINT | _NEW_PROGRAM
 180     */
 181    if (ctx->Point.PointSprite) {
 182       /* origin */
 183       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 184           (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))
 185          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 186       else
 187          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 188
 189       /* Coord replacement flags.  If bit 'k' is set that means
 190        * that we need to replace GENERIC[k] attrib with an automatically
 191        * computed texture coord.
 192        */
 193       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 194          if (ctx->Point.CoordReplace[i]) {
 195             raster->sprite_coord_enable |= 1 << i;
 196          }
 197       }
 198       if (fragProg->Base.InputsRead & FRAG_BIT_PNTC) {
 199          raster->sprite_coord_enable |=
 200             1 << (FRAG_ATTRIB_PNTC - FRAG_ATTRIB_TEX0);
 201       }
 202
 203       raster->point_quad_rasterization = 1;
 204    }
 205
 206    /* ST_NEW_VERTEX_PROGRAM
 207     */
 208    if (vertProg) {
 209       if (vertProg->Base.Id == 0) {
 210          if (vertProg->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_PSIZ)) {
 211             /* generated program which emits point size */
 212             raster->point_size_per_vertex = TRUE;
 213          }
 214       }
 215       else if (ctx->VertexProgram.PointSizeEnabled) {
 216          /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
 217          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 218       }
 219    }
 220    if (!raster->point_size_per_vertex) {
 221       /* clamp size now */
 222       raster->point_size = CLAMP(ctx->Point.Size,
 223                                  ctx->Point.MinSize,
 224                                  ctx->Point.MaxSize);
 225    }
 226
 227    /* _NEW_LINE
 228     */
 229    raster->line_smooth = ctx->Line.SmoothFlag;
 230    if (ctx->Line.SmoothFlag) {
 231       raster->line_width = CLAMP(ctx->Line.Width,
 232                                 ctx->Const.MinLineWidthAA,
 233                                 ctx->Const.MaxLineWidthAA);
 234    }
 235    else {
 236       raster->line_width = CLAMP(ctx->Line.Width,
 237                                 ctx->Const.MinLineWidth,
 238                                 ctx->Const.MaxLineWidth);
 239    }
 240
 241    raster->line_stipple_enable = ctx->Line.StippleFlag;
 242    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 243    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 244    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 245
 246    /* _NEW_MULTISAMPLE */
 247    if (ctx->Multisample._Enabled || st->force_msaa)
 248       raster->multisample = 1;
 249
 250    /* _NEW_SCISSOR */
 251    if (ctx->Scissor.Enabled)
 252       raster->scissor = 1;
 253
 254    raster->gl_rasterization_rules = 1;
 255
 256    cso_set_rasterizer(st->cso_context, raster);
 257 }
 258
 259 const struct st_tracked_state st_update_rasterizer = {
 260    "st_update_rasterizer",    /* name */
 261    {
 262       (_NEW_BUFFERS |
 263        _NEW_LIGHT |
 264        _NEW_LINE |
 265        _NEW_MULTISAMPLE |
 266        _NEW_POINT |
 267        _NEW_POLYGON |
 268        _NEW_PROGRAM |
 269        _NEW_SCISSOR),      /* mesa state dependencies*/
 270       ST_NEW_VERTEX_PROGRAM,  /* state tracker dependencies */
 271    },
 272    update_raster_state     /* update function */
 273 };