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
  34 #include "st_context.h"
  35 #include "st_cache.h"
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_defines.h"
  38 #include "st_atom.h"
  39
  40 static GLuint translate_fill( GLenum mode )
  41 {
  42    switch (mode) {
  43    case GL_POINT:
  44       return PIPE_POLYGON_MODE_POINT;
  45    case GL_LINE:
  46       return PIPE_POLYGON_MODE_LINE;
  47    case GL_FILL:
  48       return PIPE_POLYGON_MODE_FILL;
  49    default:
  50       assert(0);
  51       return 0;
  52    }
  53 }
  54
  55 static GLboolean get_offset_flag( GLuint fill_mode,
  56                                   const struct gl_polygon_attrib *p )
  57 {
  58    switch (fill_mode) {
  59    case PIPE_POLYGON_MODE_POINT:
  60       return p->OffsetPoint;
  61    case PIPE_POLYGON_MODE_LINE:
  62       return p->OffsetLine;
  63    case PIPE_POLYGON_MODE_FILL:
  64       return p->OffsetFill;
  65    default:
  66       assert(0);
  67       return 0;
  68    }
  69 }
  70
  71
  72 static void update_raster_state( struct st_context *st )
  73 {
  74    GLcontext *ctx = st->ctx;
  75    struct pipe_rasterizer_state raster;
  76    const struct cso_rasterizer *cso;
  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 (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          /* user-defined program */
 116          raster.light_twoside = ctx->VertexProgram.TwoSideEnabled;
 117       }
 118       else {
 119          /* TNL-generated program */
 120          raster.light_twoside = ctx->Light.Enabled && ctx->Light.Model.TwoSide;
 121       }
 122    }
 123    else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
 124       raster.light_twoside = 1;
 125    }
 126
 127    /* _NEW_POLYGON
 128     */
 129    if (ctx->Polygon.CullFlag) {
 130       if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
 131          raster.cull_mode = PIPE_WINDING_BOTH;
 132       }
 133       else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
 134          raster.cull_mode = raster.front_winding;
 135       }
 136       else {
 137          raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
 138       }
 139    }
 140
 141    /* _NEW_POLYGON
 142     */
 143    {
 144       GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
 145       GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
 146
 147       if (raster.front_winding == PIPE_WINDING_CW) {
 148          raster.fill_cw = fill_front;
 149          raster.fill_ccw = fill_back;
 150       }
 151       else {
 152          raster.fill_cw = fill_back;
 153          raster.fill_ccw = fill_front;
 154       }
 155
 156       /* Simplify when culling is active:
 157        */
 158       if (raster.cull_mode & PIPE_WINDING_CW) {
 159          raster.fill_cw = raster.fill_ccw;
 160       }
 161
 162       if (raster.cull_mode & PIPE_WINDING_CCW) {
 163          raster.fill_ccw = raster.fill_cw;
 164       }
 165    }
 166
 167    /* _NEW_POLYGON
 168     */
 169    if (ctx->Polygon.OffsetUnits != 0.0 ||
 170        ctx->Polygon.OffsetFactor != 0.0) {
 171       raster.offset_cw = get_offset_flag( raster.fill_cw, &ctx->Polygon );
 172       raster.offset_ccw = get_offset_flag( raster.fill_ccw, &ctx->Polygon );
 173       raster.offset_units = ctx->Polygon.OffsetUnits;
 174       raster.offset_scale = ctx->Polygon.OffsetFactor;
 175    }
 176
 177    if (ctx->Polygon.SmoothFlag)
 178       raster.poly_smooth = 1;
 179
 180    if (ctx->Polygon.StippleFlag)
 181       raster.poly_stipple_enable = 1;
 182
 183
 184    /* _NEW_BUFFERS, _NEW_POLYGON
 185     */
 186    if (raster.fill_cw != PIPE_POLYGON_MODE_FILL ||
 187        raster.fill_ccw != PIPE_POLYGON_MODE_FILL)
 188    {
 189       GLfloat mrd = (ctx->DrawBuffer ?
 190                      ctx->DrawBuffer->_MRD :
 191                      1.0);
 192
 193       raster.offset_units = ctx->Polygon.OffsetFactor * mrd;
 194       raster.offset_scale = (ctx->Polygon.OffsetUnits * mrd *
 195                             st->polygon_offset_scale);
 196    }
 197
 198    /* _NEW_POINT
 199     */
 200    raster.point_size = ctx->Point.Size;
 201    raster.point_smooth = ctx->Point.SmoothFlag;
 202    raster.point_sprite = ctx->Point.PointSprite;
 203    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 204       if (ctx->Point.CoordReplace[i]) {
 205          if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
 206             raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
 207          else
 208             raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
 209       }
 210       else {
 211          raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
 212       }
 213    }
 214    if (vertProg) {
 215       if (vertProg->Base.Id == 0) {
 216          if (vertProg->Base.OutputsWritten & (1 << VERT_RESULT_PSIZ)) {
 217             /* generated program which emits point size */
 218             raster.point_size_per_vertex = TRUE;
 219          }
 220       }
 221       else if (ctx->VertexProgram.PointSizeEnabled) {
 222          /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
 223          raster.point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 224       }
 225    }
 226
 227
 228    /* _NEW_LINE
 229     */
 230    raster.line_width = ctx->Line.Width;
 231    raster.line_smooth = ctx->Line.SmoothFlag;
 232    raster.line_stipple_enable = ctx->Line.StippleFlag;
 233    raster.line_stipple_pattern = ctx->Line.StipplePattern;
 234    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 235    raster.line_stipple_factor = ctx->Line.StippleFactor - 1;
 236
 237    /* _NEW_MULTISAMPLE */
 238    if (ctx->Multisample.Enabled)
 239       raster.multisample = 1;
 240
 241    /* _NEW_SCISSOR */
 242    if (ctx->Scissor.Enabled)
 243       raster.scissor = 1;
 244
 245    cso = st_cached_rasterizer_state(st, &raster);
 246    if (st->state.rasterizer != cso) {
 247       st->state.rasterizer = cso;
 248       st->pipe->bind_rasterizer_state(st->pipe, cso->data);
 249    }
 250 }
 251
 252 const struct st_tracked_state st_update_rasterizer = {
 253    .name = "st_update_rasterizer",
 254    .dirty = {
 255       .mesa = (_NEW_LIGHT | _NEW_POLYGON | _NEW_LINE | _NEW_SCISSOR |
 256                _NEW_POINT | _NEW_BUFFERS | _NEW_MULTISAMPLE),
 257       .st  = 0,
 258    },
 259    .update = update_raster_state
 260 };