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  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. };
  264.