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