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    raster->flatshade = ctx->Light.ShadeModel == GL_FLAT;
  88
  89    raster->flatshade_first = ctx->Light.ProvokingVertex ==
  90                              GL_FIRST_VERTEX_CONVENTION_EXT;
  91
  92    /* _NEW_LIGHT | _NEW_PROGRAM */
  93    raster->light_twoside = ctx->VertexProgram._TwoSideEnabled;
  94
  95    /*_NEW_LIGHT | _NEW_BUFFERS */
  96    raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
  97                                 ctx->Light._ClampVertexColor;
  98
  99    /* _NEW_POLYGON
 100     */
 101    if (ctx->Polygon.CullFlag) {
 102       switch (ctx->Polygon.CullFaceMode) {
 103       case GL_FRONT:
 104          raster->cull_face = PIPE_FACE_FRONT;
 105          break;
 106       case GL_BACK:
 107          raster->cull_face = PIPE_FACE_BACK;
 108          break;
 109       case GL_FRONT_AND_BACK:
 110          raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
 111          break;
 112       }
 113    }
 114    else {
 115       raster->cull_face = PIPE_FACE_NONE;
 116    }
 117
 118    /* _NEW_POLYGON
 119     */
 120    {
 121       raster->fill_front = translate_fill( ctx->Polygon.FrontMode );
 122       raster->fill_back = translate_fill( ctx->Polygon.BackMode );
 123
 124       /* Simplify when culling is active:
 125        */
 126       if (raster->cull_face & PIPE_FACE_FRONT) {
 127          raster->fill_front = raster->fill_back;
 128       }
 129
 130       if (raster->cull_face & PIPE_FACE_BACK) {
 131          raster->fill_back = raster->fill_front;
 132       }
 133    }
 134
 135    /* _NEW_POLYGON
 136     */
 137    if (ctx->Polygon.OffsetPoint ||
 138        ctx->Polygon.OffsetLine ||
 139        ctx->Polygon.OffsetFill) {
 140       raster->offset_point = ctx->Polygon.OffsetPoint;
 141       raster->offset_line = ctx->Polygon.OffsetLine;
 142       raster->offset_tri = ctx->Polygon.OffsetFill;
 143       raster->offset_units = ctx->Polygon.OffsetUnits;
 144       raster->offset_scale = ctx->Polygon.OffsetFactor;
 145    }
 146
 147    raster->poly_smooth = ctx->Polygon.SmoothFlag;
 148    raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
 149
 150    /* _NEW_POINT
 151     */
 152    raster->point_size = ctx->Point.Size;
 153    raster->point_smooth = !ctx->Point.PointSprite && ctx->Point.SmoothFlag;
 154
 155    /* _NEW_POINT | _NEW_PROGRAM
 156     */
 157    if (ctx->Point.PointSprite) {
 158       /* origin */
 159       if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
 160           (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))
 161          raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
 162       else
 163          raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
 164
 165       /* Coord replacement flags.  If bit 'k' is set that means
 166        * that we need to replace GENERIC[k] attrib with an automatically
 167        * computed texture coord.
 168        */
 169       for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 170          if (ctx->Point.CoordReplace[i]) {
 171             raster->sprite_coord_enable |= 1 << i;
 172          }
 173       }
 174       if (fragProg->Base.InputsRead & VARYING_BIT_PNTC) {
 175          raster->sprite_coord_enable |=
 176             1 << (VARYING_SLOT_PNTC - VARYING_SLOT_TEX0);
 177       }
 178
 179       raster->point_quad_rasterization = 1;
 180    }
 181
 182    /* ST_NEW_VERTEX_PROGRAM
 183     */
 184    if (vertProg) {
 185       if (vertProg->Base.Id == 0) {
 186          if (vertProg->Base.OutputsWritten & BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
 187             /* generated program which emits point size */
 188             raster->point_size_per_vertex = TRUE;
 189          }
 190       }
 191       else if (ctx->VertexProgram.PointSizeEnabled) {
 192          /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
 193          raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 194       }
 195    }
 196    if (!raster->point_size_per_vertex) {
 197       /* clamp size now */
 198       raster->point_size = CLAMP(ctx->Point.Size,
 199                                  ctx->Point.MinSize,
 200                                  ctx->Point.MaxSize);
 201    }
 202
 203    /* _NEW_LINE
 204     */
 205    raster->line_smooth = ctx->Line.SmoothFlag;
 206    if (ctx->Line.SmoothFlag) {
 207       raster->line_width = CLAMP(ctx->Line.Width,
 208                                 ctx->Const.MinLineWidthAA,
 209                                 ctx->Const.MaxLineWidthAA);
 210    }
 211    else {
 212       raster->line_width = CLAMP(ctx->Line.Width,
 213                                 ctx->Const.MinLineWidth,
 214                                 ctx->Const.MaxLineWidth);
 215    }
 216
 217    raster->line_stipple_enable = ctx->Line.StippleFlag;
 218    raster->line_stipple_pattern = ctx->Line.StipplePattern;
 219    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 220    raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
 221
 222    /* _NEW_MULTISAMPLE */
 223    raster->multisample = ctx->Multisample._Enabled;
 224
 225    /* _NEW_SCISSOR */
 226    raster->scissor = ctx->Scissor.Enabled;
 227
 228    /* _NEW_FRAG_CLAMP */
 229    raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
 230                                   ctx->Color._ClampFragmentColor;
 231
 232    raster->half_pixel_center = 1;
 233    if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP)
 234       raster->bottom_edge_rule = 1;
 235
 236    /* ST_NEW_RASTERIZER */
 237    raster->rasterizer_discard = ctx->RasterDiscard;
 238
 239    /* _NEW_TRANSFORM */
 240    raster->depth_clip = ctx->Transform.DepthClamp == GL_FALSE;
 241    raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
 242
 243    cso_set_rasterizer(st->cso_context, raster);
 244 }
 245
 246 const struct st_tracked_state st_update_rasterizer = {
 247    "st_update_rasterizer",    /* name */
 248    {
 249       (_NEW_BUFFERS |
 250        _NEW_LIGHT |
 251        _NEW_LINE |
 252        _NEW_MULTISAMPLE |
 253        _NEW_POINT |
 254        _NEW_POLYGON |
 255        _NEW_PROGRAM |
 256        _NEW_SCISSOR |
 257        _NEW_FRAG_CLAMP |
 258        _NEW_TRANSFORM),      /* mesa state dependencies*/
 259       (ST_NEW_VERTEX_PROGRAM |
 260        ST_NEW_RASTERIZER),  /* state tracker dependencies */
 261    },
 262    update_raster_state     /* update function */
 263 };