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/**

 * \file polygon.c

 * Polygon operations.

 */

/*

 * Mesa 3-D graphics library

 * Version:  6.5.1

 *

 * Copyright (C) 1999-2006  Brian Paul   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, sublicense,

 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL

 * BRIAN PAUL 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.

 */

#include "glheader.h"

#include "imports.h"

#include "bufferobj.h"

#include "context.h"

#include "image.h"

#include "enums.h"

#include "pack.h"

#include "polygon.h"

#include "mtypes.h"

/**

 * Specify whether to cull front- or back-facing facets.

 *

 * \param mode culling mode.

 *

 * \sa glCullFace().

 *

 * Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On

 * change, flushes the vertices and notifies the driver via

 * the dd_function_table::CullFace callback.

 */

void GLAPIENTRY

_mesa_CullFace( GLenum mode )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode));

   if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) {

      _mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" );

      return;

   }

   if (ctx->Polygon.CullFaceMode == mode)

      return;

   FLUSH_VERTICES(ctx, _NEW_POLYGON);

   ctx->Polygon.CullFaceMode = mode;

   if (ctx->Driver.CullFace)

      ctx->Driver.CullFace( ctx, mode );

}

/**

 * Define front- and back-facing

 *

 * \param mode orientation of front-facing polygons.

 *

 * \sa glFrontFace().

 *

 * Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change

 * flushes the vertices and notifies the driver via

 * the dd_function_table::FrontFace callback.

 */

void GLAPIENTRY

_mesa_FrontFace( GLenum mode )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));

   if (mode!=GL_CW && mode!=GL_CCW) {

      _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );

      return;

   }

   if (ctx->Polygon.FrontFace == mode)

      return;

   FLUSH_VERTICES(ctx, _NEW_POLYGON);

   ctx->Polygon.FrontFace = mode;

   ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);

   if (ctx->Driver.FrontFace)

      ctx->Driver.FrontFace( ctx, mode );

}

/**

 * Set the polygon rasterization mode.

 *

 * \param face the polygons which \p mode applies to.

 * \param mode how polygons should be rasterized.

 *

 * \sa glPolygonMode().

 *

 * Verifies the parameters and updates gl_polygon_attrib::FrontMode and

 * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the

 * driver via the dd_function_table::PolygonMode callback.

 */

void GLAPIENTRY

_mesa_PolygonMode( GLenum face, GLenum mode )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glPolygonMode %s %s\n",

                  _mesa_lookup_enum_by_nr(face),

                  _mesa_lookup_enum_by_nr(mode));

   if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {

      _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );

      return;

   }

   switch (face) {

   case GL_FRONT:

      if (ctx->Polygon.FrontMode == mode)

	 return;

      FLUSH_VERTICES(ctx, _NEW_POLYGON);

      ctx->Polygon.FrontMode = mode;

      break;

   case GL_FRONT_AND_BACK:

      if (ctx->Polygon.FrontMode == mode &&

	  ctx->Polygon.BackMode == mode)

	 return;

      FLUSH_VERTICES(ctx, _NEW_POLYGON);

      ctx->Polygon.FrontMode = mode;

      ctx->Polygon.BackMode = mode;

      break;

   case GL_BACK:

      if (ctx->Polygon.BackMode == mode)

	 return;

      FLUSH_VERTICES(ctx, _NEW_POLYGON);

      ctx->Polygon.BackMode = mode;

      break;

   default:

      _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );

      return;

   }

   if (ctx->Polygon.FrontMode == GL_FILL && ctx->Polygon.BackMode == GL_FILL)

      ctx->_TriangleCaps &= ~DD_TRI_UNFILLED;

   else

      ctx->_TriangleCaps |= DD_TRI_UNFILLED;

   if (ctx->Driver.PolygonMode)

      ctx->Driver.PolygonMode(ctx, face, mode);

}

#if _HAVE_FULL_GL

/**

 * This routine updates the ctx->Polygon.Stipple state.

 * If we're getting the stipple data from a PBO, we map the buffer

 * in order to access the data.

 * In any case, we obey the current pixel unpacking parameters when fetching

 * the stipple data.

 *

 * In the future, this routine should be used as a fallback, called via

 * ctx->Driver.PolygonStipple().  We'll have to update all the DRI drivers

 * too.

 */

void

_mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern)

{

   pattern = _mesa_map_validate_pbo_source(ctx, 2,

                                           &ctx->Unpack, 32, 32, 1,

                                           GL_COLOR_INDEX, GL_BITMAP, pattern,

                                           "glPolygonStipple");

   if (!pattern)

      return;

   _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);

   _mesa_unmap_pbo_source(ctx, &ctx->Unpack);

}

/**

 * Called by glPolygonStipple.

 */

void GLAPIENTRY

_mesa_PolygonStipple( const GLubyte *pattern )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glPolygonStipple\n");

   FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);

   _mesa_polygon_stipple(ctx, pattern);

   if (ctx->Driver.PolygonStipple)

      ctx->Driver.PolygonStipple(ctx, pattern);

}

/**

 * Called by glPolygonStipple.

 */

void GLAPIENTRY

_mesa_GetPolygonStipple( GLubyte *dest )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glGetPolygonStipple\n");

   dest = _mesa_map_validate_pbo_dest(ctx, 2,

                                      &ctx->Pack, 32, 32, 1,

                                      GL_COLOR_INDEX, GL_BITMAP, dest,

                                      "glGetPolygonStipple");

   if (!dest)

      return;

   _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);

   _mesa_unmap_pbo_dest(ctx, &ctx->Pack);

}

void GLAPIENTRY

_mesa_PolygonOffset( GLfloat factor, GLfloat units )

{

   GET_CURRENT_CONTEXT(ctx);

   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (MESA_VERBOSE&VERBOSE_API)

      _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);

   if (ctx->Polygon.OffsetFactor == factor &&

       ctx->Polygon.OffsetUnits == units)

      return;

   FLUSH_VERTICES(ctx, _NEW_POLYGON);

   ctx->Polygon.OffsetFactor = factor;

   ctx->Polygon.OffsetUnits = units;

   if (ctx->Driver.PolygonOffset)

      ctx->Driver.PolygonOffset( ctx, factor, units );

}

void GLAPIENTRY

_mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )

{

   GET_CURRENT_CONTEXT(ctx);

   /* XXX mult by DepthMaxF here??? */

   _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );

}

#endif

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

/** \name Initialization */

/*@{*/

/**

 * Initialize the context polygon state.

 *

 * \param ctx GL context.

 *

 * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple

 * attribute groups.

 */

void _mesa_init_polygon( struct gl_context * ctx )

{

   /* Polygon group */

   ctx->Polygon.CullFlag = GL_FALSE;

   ctx->Polygon.CullFaceMode = GL_BACK;

   ctx->Polygon.FrontFace = GL_CCW;

   ctx->Polygon._FrontBit = 0;

   ctx->Polygon.FrontMode = GL_FILL;

   ctx->Polygon.BackMode = GL_FILL;

   ctx->Polygon.SmoothFlag = GL_FALSE;

   ctx->Polygon.StippleFlag = GL_FALSE;

   ctx->Polygon.OffsetFactor = 0.0F;

   ctx->Polygon.OffsetUnits = 0.0F;

   ctx->Polygon.OffsetPoint = GL_FALSE;

   ctx->Polygon.OffsetLine = GL_FALSE;

   ctx->Polygon.OffsetFill = GL_FALSE;

   /* Polygon Stipple group */

   memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );

}

/*@}*/