| /** |
| * \file polygon.c |
| * Polygon operations. |
| */ |
| |
| /* |
| * Mesa 3-D graphics library |
| * |
| * 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 |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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) ); |
| } |
| |
| /*@}*/ |