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    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    if (ctx->Polygon.SmoothFlag)
 149       raster->poly_smooth = 1;
 150
 151    if (ctx->Polygon.StippleFlag)
 152       raster->poly_stipple_enable = 1;
 153
 154    /* _NEW_POINT
 155     */
 156    raster->point_size = ctx->Point.Size;
 157
 158    if (!ctx->Point.PointSprite && ctx->Point.SmoothFlag)
 159       raster->point_smooth = 1;
 160
 161    /* _NEW_POINT | _NEW_PROGRAM
 162     */
 163    if (ctx->Point.PointSprite) {
 164       /* origin */
 165       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 166           (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))
 167          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 168       else
 169          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 170
 171       /* Coord replacement flags.  If bit 'k' is set that means
 172        * that we need to replace GENERIC[k] attrib with an automatically
 173        * computed texture coord.
 174        */
 175       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 176          if (ctx->Point.CoordReplace[i]) {
 177             raster->sprite_coord_enable |= 1 << i;
 178          }
 179       }
 180       if (fragProg->Base.InputsRead & FRAG_BIT_PNTC) {
 181          raster->sprite_coord_enable |=
 182             1 << (FRAG_ATTRIB_PNTC - FRAG_ATTRIB_TEX0);
 183       }
 184
 185       raster->point_quad_rasterization = 1;
 186    }
 187
 188    /* ST_NEW_VERTEX_PROGRAM
 189     */
 190    if (vertProg) {
 191       if (vertProg->Base.Id == 0) {
 192          if (vertProg->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_PSIZ)) {
 193             /* generated program which emits point size */
 194             raster->point_size_per_vertex = TRUE;
 195          }
 196       }
 197       else if (ctx->VertexProgram.PointSizeEnabled) {
 198          /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
 199          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 200       }
 201    }
 202    if (!raster->point_size_per_vertex) {
 203       /* clamp size now */
 204       raster->point_size = CLAMP(ctx->Point.Size,
 205                                  ctx->Point.MinSize,
 206                                  ctx->Point.MaxSize);
 207    }
 208
 209    /* _NEW_LINE
 210     */
 211    raster->line_smooth = ctx->Line.SmoothFlag;
 212    if (ctx->Line.SmoothFlag) {
 213       raster->line_width = CLAMP(ctx->Line.Width,
 214                                 ctx->Const.MinLineWidthAA,
 215                                 ctx->Const.MaxLineWidthAA);
 216    }
 217    else {
 218       raster->line_width = CLAMP(ctx->Line.Width,
 219                                 ctx->Const.MinLineWidth,
 220                                 ctx->Const.MaxLineWidth);
 221    }
 222
 223    raster->line_stipple_enable = ctx->Line.StippleFlag;
 224    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 225    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 226    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 227
 228    /* _NEW_MULTISAMPLE */
 229    raster->multisample = ctx->Multisample._Enabled;
 230
 231    /* _NEW_SCISSOR */
 232    if (ctx->Scissor.Enabled)
 233       raster->scissor = 1;
 234
 235    /* _NEW_FRAG_CLAMP */
 236    raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
 237                                   ctx->Color._ClampFragmentColor &&
 238                                   !ctx->DrawBuffer->_IntegerColor;
 239    raster->gl_rasterization_rules = 1;
 240
 241    /* _NEW_RASTERIZER_DISCARD */
 242    raster->rasterizer_discard = ctx->RasterDiscard;
 243
 244    /* _NEW_TRANSFORM */
 245    raster->depth_clip = ctx->Transform.DepthClamp == GL_FALSE;
 246    raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
 247
 248    cso_set_rasterizer(st->cso_context, raster);
 249 }
 250
 251 const struct st_tracked_state st_update_rasterizer = {
 252    "st_update_rasterizer",    /* name */
 253    {
 254       (_NEW_BUFFERS |
 255        _NEW_LIGHT |
 256        _NEW_LINE |
 257        _NEW_MULTISAMPLE |
 258        _NEW_POINT |
 259        _NEW_POLYGON |
 260        _NEW_PROGRAM |
 261        _NEW_SCISSOR |
 262        _NEW_FRAG_CLAMP |
 263        _NEW_RASTERIZER_DISCARD |
 264        _NEW_TRANSFORM),      /* mesa state dependencies*/
 265       ST_NEW_VERTEX_PROGRAM,  /* state tracker dependencies */
 266    },
 267    update_raster_state     /* update function */
 268 };