/**
* \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
) ); }
/*@}*/