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/**************************************************************************

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

 /*

  * Authors:

  *   Keith Whitwell 

  */

#include "main/macros.h"

#include "st_context.h"

#include "st_atom.h"

#include "pipe/p_context.h"

#include "pipe/p_defines.h"

#include "cso_cache/cso_context.h"

static GLuint translate_fill( GLenum mode )

{

   switch (mode) {

   case GL_POINT:

      return PIPE_POLYGON_MODE_POINT;

   case GL_LINE:

      return PIPE_POLYGON_MODE_LINE;

   case GL_FILL:

      return PIPE_POLYGON_MODE_FILL;

   default:

      assert(0);

      return 0;

   }

}

static void update_raster_state( struct st_context *st )

{

   struct gl_context *ctx = st->ctx;

   struct pipe_rasterizer_state *raster = &st->state.rasterizer;

   const struct gl_vertex_program *vertProg = ctx->VertexProgram._Current;

   const struct gl_fragment_program *fragProg = ctx->FragmentProgram._Current;

   uint i;

   memset(raster, 0, sizeof(*raster));

   /* _NEW_POLYGON, _NEW_BUFFERS

    */

   {

      raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);

      /* XXX

       * I think the intention here is that user-created framebuffer objects

       * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.

       * Flipping Y changes CW to CCW and vice-versa.

       * But this is an implementation/driver-specific artifact - remove...

       */

      if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)

         raster->front_ccw ^= 1;

   }

   /* _NEW_LIGHT

    */

   if (ctx->Light.ShadeModel == GL_FLAT)

      raster->flatshade = 1;

   if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION_EXT)

      raster->flatshade_first = 1;

   /* _NEW_LIGHT | _NEW_PROGRAM

    *

    * Back-face colors can come from traditional lighting (when

    * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs/shaders (when

    * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.

    */

   if (ctx->VertexProgram._Current) {

      if (ctx->VertexProgram._Enabled ||

          (ctx->Shader.CurrentVertexProgram &&

           ctx->Shader.CurrentVertexProgram->LinkStatus)) {

         /* user-defined vertex program or shader */

         raster->light_twoside = ctx->VertexProgram.TwoSideEnabled;

      }

      else {

         /* TNL-generated program */

         raster->light_twoside = ctx->Light.Enabled && ctx->Light.Model.TwoSide;

      }

   }

   else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {

      raster->light_twoside = 1;

   }

   /* _NEW_POLYGON

    */

   if (ctx->Polygon.CullFlag) {

      switch (ctx->Polygon.CullFaceMode) {

      case GL_FRONT:

	 raster->cull_face = PIPE_FACE_FRONT;

         break;

      case GL_BACK:

	 raster->cull_face = PIPE_FACE_BACK;

         break;

      case GL_FRONT_AND_BACK:

	 raster->cull_face = PIPE_FACE_FRONT_AND_BACK;

         break;

      }

   }

   else {

      raster->cull_face = PIPE_FACE_NONE;

   }

   /* _NEW_POLYGON

    */

   {

      raster->fill_front = translate_fill( ctx->Polygon.FrontMode );

      raster->fill_back = translate_fill( ctx->Polygon.BackMode );

      /* Simplify when culling is active:

       */

      if (raster->cull_face & PIPE_FACE_FRONT) {

	 raster->fill_front = raster->fill_back;

      }

      if (raster->cull_face & PIPE_FACE_BACK) {

	 raster->fill_back = raster->fill_front;

      }

   }

   /* _NEW_POLYGON

    */

   if (ctx->Polygon.OffsetUnits != 0.0 ||

       ctx->Polygon.OffsetFactor != 0.0) {

      raster->offset_point = ctx->Polygon.OffsetPoint;

      raster->offset_line = ctx->Polygon.OffsetLine;

      raster->offset_tri = ctx->Polygon.OffsetFill;

   }

   if (ctx->Polygon.OffsetPoint ||

       ctx->Polygon.OffsetLine ||

       ctx->Polygon.OffsetFill) {

      raster->offset_units = ctx->Polygon.OffsetUnits;

      raster->offset_scale = ctx->Polygon.OffsetFactor;

   }

   if (ctx->Polygon.SmoothFlag)

      raster->poly_smooth = 1;

   if (ctx->Polygon.StippleFlag)

      raster->poly_stipple_enable = 1;

   /* _NEW_POINT

    */

   raster->point_size = ctx->Point.Size;

   if (!ctx->Point.PointSprite && ctx->Point.SmoothFlag)

      raster->point_smooth = 1;

   /* _NEW_POINT | _NEW_PROGRAM

    */

   if (ctx->Point.PointSprite) {

      /* origin */

      if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^

          (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))

         raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;

      else

         raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;

      /* Coord replacement flags.  If bit 'k' is set that means

       * that we need to replace GENERIC[k] attrib with an automatically

       * computed texture coord.

       */

      for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {

         if (ctx->Point.CoordReplace[i]) {

            raster->sprite_coord_enable |= 1 << i;

         }

      }

      if (fragProg->Base.InputsRead & FRAG_BIT_PNTC) {

         raster->sprite_coord_enable |=

            1 << (FRAG_ATTRIB_PNTC - FRAG_ATTRIB_TEX0);

      }

      raster->point_quad_rasterization = 1;

   }

   /* ST_NEW_VERTEX_PROGRAM

    */

   if (vertProg) {

      if (vertProg->Base.Id == 0) {

         if (vertProg->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_PSIZ)) {

            /* generated program which emits point size */

            raster->point_size_per_vertex = TRUE;

         }

      }

      else if (ctx->VertexProgram.PointSizeEnabled) {

         /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */

         raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;

      }

   }

   if (!raster->point_size_per_vertex) {

      /* clamp size now */

      raster->point_size = CLAMP(ctx->Point.Size,

                                 ctx->Point.MinSize,

                                 ctx->Point.MaxSize);

   }

   /* _NEW_LINE

    */

   raster->line_smooth = ctx->Line.SmoothFlag;

   if (ctx->Line.SmoothFlag) {

      raster->line_width = CLAMP(ctx->Line.Width,

                                ctx->Const.MinLineWidthAA,

                                ctx->Const.MaxLineWidthAA);

   }

   else {

      raster->line_width = CLAMP(ctx->Line.Width,

                                ctx->Const.MinLineWidth,

                                ctx->Const.MaxLineWidth);

   }

   raster->line_stipple_enable = ctx->Line.StippleFlag;

   raster->line_stipple_pattern = ctx->Line.StipplePattern;

   /* GL stipple factor is in [1,256], remap to [0, 255] here */

   raster->line_stipple_factor = ctx->Line.StippleFactor - 1;

   /* _NEW_MULTISAMPLE */

   if (ctx->Multisample._Enabled || st->force_msaa)

      raster->multisample = 1;

   /* _NEW_SCISSOR */

   if (ctx->Scissor.Enabled)

      raster->scissor = 1;

   raster->gl_rasterization_rules = 1;

   cso_set_rasterizer(st->cso_context, raster);

}

const struct st_tracked_state st_update_rasterizer = {

   "st_update_rasterizer",    /* name */

   {

      (_NEW_BUFFERS |

       _NEW_LIGHT |

       _NEW_LINE |

       _NEW_MULTISAMPLE |

       _NEW_POINT |

       _NEW_POLYGON |

       _NEW_PROGRAM |

       _NEW_SCISSOR),      /* mesa state dependencies*/

      ST_NEW_VERTEX_PROGRAM,  /* state tracker dependencies */

   },

   update_raster_state     /* update function */

};