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    uint i;
  78
  79    memset(&raster, 0, sizeof(raster));
  80
  81    raster.origin_lower_left = 1; /* Always true for OpenGL */
  82
  83    /* _NEW_POLYGON, _NEW_BUFFERS
  84     */
  85    {
  86       if (ctx->Polygon.FrontFace == GL_CCW)
  87          raster.front_winding = PIPE_WINDING_CCW;
  88       else
  89          raster.front_winding = PIPE_WINDING_CW;
  90
  91       /* XXX
  92        * I think the intention here is that user-created framebuffer objects
  93        * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
  94        * Flipping Y changes CW to CCW and vice-versa.
  95        * But this is an implementation/driver-specific artifact - remove...
  96        */
  97       if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
  98          raster.front_winding ^= PIPE_WINDING_BOTH;
  99    }
 100
 101    /* _NEW_LIGHT
 102     */
 103    if (ctx->Light.ShadeModel == GL_FLAT)
 104       raster.flatshade = 1;
 105
 106    /* _NEW_LIGHT | _NEW_PROGRAM
 107     *
 108     * Back-face colors can come from traditional lighting (when
 109     * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs (when
 110     * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
 111     */
 112    if (ctx->VertexProgram._Current) {
 113       raster.light_twoside = ctx->VertexProgram.TwoSideEnabled;
 114    }
 115    else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
 116       raster.light_twoside = 1;
 117    }
 118
 119    /* _NEW_POLYGON
 120     */
 121    if (ctx->Polygon.CullFlag) {
 122       if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
 123          raster.cull_mode = PIPE_WINDING_BOTH;
 124       }
 125       else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
 126          raster.cull_mode = raster.front_winding;
 127       }
 128       else {
 129          raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
 130       }
 131    }
 132
 133    /* _NEW_POLYGON
 134     */
 135    {
 136       GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
 137       GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
 138
 139       if (raster.front_winding == PIPE_WINDING_CW) {
 140          raster.fill_cw = fill_front;
 141          raster.fill_ccw = fill_back;
 142       }
 143       else {
 144          raster.fill_cw = fill_back;
 145          raster.fill_ccw = fill_front;
 146       }
 147
 148       /* Simplify when culling is active:
 149        */
 150       if (raster.cull_mode & PIPE_WINDING_CW) {
 151          raster.fill_cw = raster.fill_ccw;
 152       }
 153
 154       if (raster.cull_mode & PIPE_WINDING_CCW) {
 155          raster.fill_ccw = raster.fill_cw;
 156       }
 157    }
 158
 159    /* _NEW_POLYGON
 160     */
 161    if (ctx->Polygon.OffsetUnits != 0.0 ||
 162        ctx->Polygon.OffsetFactor != 0.0) {
 163       raster.offset_cw = get_offset_flag( raster.fill_cw, &ctx->Polygon );
 164       raster.offset_ccw = get_offset_flag( raster.fill_ccw, &ctx->Polygon );
 165       raster.offset_units = ctx->Polygon.OffsetUnits;
 166       raster.offset_scale = ctx->Polygon.OffsetFactor;
 167    }
 168
 169    if (ctx->Polygon.SmoothFlag)
 170       raster.poly_smooth = 1;
 171
 172    if (ctx->Polygon.StippleFlag)
 173       raster.poly_stipple_enable = 1;
 174
 175
 176    /* _NEW_BUFFERS, _NEW_POLYGON
 177     */
 178    if (raster.fill_cw != PIPE_POLYGON_MODE_FILL ||
 179        raster.fill_ccw != PIPE_POLYGON_MODE_FILL)
 180    {
 181       GLfloat mrd = (ctx->DrawBuffer ?
 182                      ctx->DrawBuffer->_MRD :
 183                      1.0);
 184
 185       raster.offset_units = ctx->Polygon.OffsetFactor * mrd;
 186       raster.offset_scale = (ctx->Polygon.OffsetUnits * mrd *
 187                             st->polygon_offset_scale);
 188    }
 189
 190    /* _NEW_POINT
 191     */
 192    raster.point_size = ctx->Point.Size;
 193    raster.point_smooth = ctx->Point.SmoothFlag;
 194    raster.point_sprite = ctx->Point.PointSprite;
 195    for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
 196       if (ctx->Point.CoordReplace[i]) {
 197          if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
 198             raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
 199          else
 200             raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
 201       }
 202       else {
 203          raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
 204       }
 205    }
 206    raster.point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
 207
 208    /* _NEW_LINE
 209     */
 210    raster.line_width = ctx->Line.Width;
 211    raster.line_smooth = ctx->Line.SmoothFlag;
 212    raster.line_stipple_enable = ctx->Line.StippleFlag;
 213    raster.line_stipple_pattern = ctx->Line.StipplePattern;
 214    /* GL stipple factor is in [1,256], remap to [0, 255] here */
 215    raster.line_stipple_factor = ctx->Line.StippleFactor - 1;
 216
 217    /* _NEW_MULTISAMPLE */
 218    if (ctx->Multisample.Enabled)
 219       raster.multisample = 1;
 220
 221    /* _NEW_SCISSOR */
 222    if (ctx->Scissor.Enabled)
 223       raster.scissor = 1;
 224
 225    cso = st_cached_rasterizer_state(st, &raster);
 226    if (st->state.rasterizer != cso) {
 227       st->state.rasterizer = cso;
 228       st->pipe->bind_rasterizer_state(st->pipe, cso->data);
 229    }
 230 }
 231
 232 const struct st_tracked_state st_update_rasterizer = {
 233    .name = "st_update_rasterizer",
 234    .dirty = {
 235       .mesa = (_NEW_LIGHT | _NEW_POLYGON | _NEW_LINE | _NEW_SCISSOR |
 236                _NEW_POINT | _NEW_BUFFERS | _NEW_MULTISAMPLE),
 237       .st  = 0,
 238    },
 239    .update = update_raster_state
 240 };