/** * \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 "context.h" #include "image.h" #include "enums.h" #include "pack.h" #include "pbo.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); 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); 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); 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->API == API_OPENGL_CORE) { _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" ); return; } 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->API == API_OPENGL_CORE) { _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" ); return; } 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->Driver.PolygonMode) ctx->Driver.PolygonMode(ctx, face, mode); } /** * 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, INT_MAX, 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); 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_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest ) { GET_CURRENT_CONTEXT(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, bufSize, dest, "glGetPolygonStipple"); if (!dest) return; _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack); _mesa_unmap_pbo_dest(ctx, &ctx->Pack); } void GLAPIENTRY _mesa_GetPolygonStipple( GLubyte *dest ) { _mesa_GetnPolygonStippleARB(INT_MAX, dest); } void GLAPIENTRY _mesa_PolygonOffset( GLfloat factor, GLfloat units ) { GET_CURRENT_CONTEXT(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 ); } /**********************************************************************/ /** \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) ); } /*@}*/