src/mesa/main/polygon.c

   1 /**
   2  * \file polygon.c
   3  * Polygon operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  *
   9  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included
  19  * in all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  24  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  25  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  26  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  27  * OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "imports.h"
  33 #include "context.h"
  34 #include "image.h"
  35 #include "enums.h"
  36 #include "pack.h"
  37 #include "pbo.h"
  38 #include "polygon.h"
  39 #include "mtypes.h"
  40
  41
  42 /**
  43  * Specify whether to cull front- or back-facing facets.
  44  *
  45  * \param mode culling mode.
  46  *
  47  * \sa glCullFace().
  48  *
  49  * Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On
  50  * change, flushes the vertices and notifies the driver via
  51  * the dd_function_table::CullFace callback.
  52  */
  53 void GLAPIENTRY
  54 _mesa_CullFace( GLenum mode )
  55 {
  56    GET_CURRENT_CONTEXT(ctx);
  57
  58    if (MESA_VERBOSE&VERBOSE_API)
  59       _mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode));
  60
  61    if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) {
  62       _mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" );
  63       return;
  64    }
  65
  66    if (ctx->Polygon.CullFaceMode == mode)
  67       return;
  68
  69    FLUSH_VERTICES(ctx, _NEW_POLYGON);
  70    ctx->Polygon.CullFaceMode = mode;
  71
  72    if (ctx->Driver.CullFace)
  73       ctx->Driver.CullFace( ctx, mode );
  74 }
  75
  76
  77 /**
  78  * Define front- and back-facing
  79  *
  80  * \param mode orientation of front-facing polygons.
  81  *
  82  * \sa glFrontFace().
  83  *
  84  * Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change
  85  * flushes the vertices and notifies the driver via
  86  * the dd_function_table::FrontFace callback.
  87  */
  88 void GLAPIENTRY
  89 _mesa_FrontFace( GLenum mode )
  90 {
  91    GET_CURRENT_CONTEXT(ctx);
  92
  93    if (MESA_VERBOSE&VERBOSE_API)
  94       _mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));
  95
  96    if (mode!=GL_CW && mode!=GL_CCW) {
  97       _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
  98       return;
  99    }
 100
 101    if (ctx->Polygon.FrontFace == mode)
 102       return;
 103
 104    FLUSH_VERTICES(ctx, _NEW_POLYGON);
 105    ctx->Polygon.FrontFace = mode;
 106
 107    if (ctx->Driver.FrontFace)
 108       ctx->Driver.FrontFace( ctx, mode );
 109 }
 110
 111
 112 /**
 113  * Set the polygon rasterization mode.
 114  *
 115  * \param face the polygons which \p mode applies to.
 116  * \param mode how polygons should be rasterized.
 117  *
 118  * \sa glPolygonMode().
 119  *
 120  * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
 121  * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
 122  * driver via the dd_function_table::PolygonMode callback.
 123  */
 124 void GLAPIENTRY
 125 _mesa_PolygonMode( GLenum face, GLenum mode )
 126 {
 127    GET_CURRENT_CONTEXT(ctx);
 128
 129    if (MESA_VERBOSE&VERBOSE_API)
 130       _mesa_debug(ctx, "glPolygonMode %s %s\n",
 131                   _mesa_lookup_enum_by_nr(face),
 132                   _mesa_lookup_enum_by_nr(mode));
 133
 134    if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
 135       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
 136       return;
 137    }
 138
 139    switch (face) {
 140    case GL_FRONT:
 141       if (ctx->API == API_OPENGL_CORE) {
 142          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 143          return;
 144       }
 145       if (ctx->Polygon.FrontMode == mode)
 146          return;
 147       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 148       ctx->Polygon.FrontMode = mode;
 149       break;
 150    case GL_FRONT_AND_BACK:
 151       if (ctx->Polygon.FrontMode == mode &&
 152           ctx->Polygon.BackMode == mode)
 153          return;
 154       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 155       ctx->Polygon.FrontMode = mode;
 156       ctx->Polygon.BackMode = mode;
 157       break;
 158    case GL_BACK:
 159       if (ctx->API == API_OPENGL_CORE) {
 160          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 161          return;
 162       }
 163       if (ctx->Polygon.BackMode == mode)
 164          return;
 165       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 166       ctx->Polygon.BackMode = mode;
 167       break;
 168    default:
 169       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 170       return;
 171    }
 172
 173    if (ctx->Driver.PolygonMode)
 174       ctx->Driver.PolygonMode(ctx, face, mode);
 175 }
 176
 177
 178 /**
 179  * This routine updates the ctx->Polygon.Stipple state.
 180  * If we're getting the stipple data from a PBO, we map the buffer
 181  * in order to access the data.
 182  * In any case, we obey the current pixel unpacking parameters when fetching
 183  * the stipple data.
 184  *
 185  * In the future, this routine should be used as a fallback, called via
 186  * ctx->Driver.PolygonStipple().  We'll have to update all the DRI drivers
 187  * too.
 188  */
 189 void
 190 _mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern)
 191 {
 192    pattern = _mesa_map_validate_pbo_source(ctx, 2,
 193                                            &ctx->Unpack, 32, 32, 1,
 194                                            GL_COLOR_INDEX, GL_BITMAP,
 195                                            INT_MAX, pattern,
 196                                            "glPolygonStipple");
 197    if (!pattern)
 198       return;
 199
 200    _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
 201
 202    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 203 }
 204
 205
 206 /**
 207  * Called by glPolygonStipple.
 208  */
 209 void GLAPIENTRY
 210 _mesa_PolygonStipple( const GLubyte *pattern )
 211 {
 212    GET_CURRENT_CONTEXT(ctx);
 213
 214    if (MESA_VERBOSE&VERBOSE_API)
 215       _mesa_debug(ctx, "glPolygonStipple\n");
 216
 217    FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
 218
 219    _mesa_polygon_stipple(ctx, pattern);
 220
 221    if (ctx->Driver.PolygonStipple)
 222       ctx->Driver.PolygonStipple(ctx, pattern);
 223 }
 224
 225
 226 /**
 227  * Called by glPolygonStipple.
 228  */
 229 void GLAPIENTRY
 230 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
 231 {
 232    GET_CURRENT_CONTEXT(ctx);
 233
 234    if (MESA_VERBOSE&VERBOSE_API)
 235       _mesa_debug(ctx, "glGetPolygonStipple\n");
 236
 237    dest = _mesa_map_validate_pbo_dest(ctx, 2,
 238                                       &ctx->Pack, 32, 32, 1,
 239                                       GL_COLOR_INDEX, GL_BITMAP,
 240                                       bufSize, dest, "glGetPolygonStipple");
 241    if (!dest)
 242       return;
 243
 244    _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
 245
 246    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 247 }
 248
 249
 250 void GLAPIENTRY
 251 _mesa_GetPolygonStipple( GLubyte *dest )
 252 {
 253    _mesa_GetnPolygonStippleARB(INT_MAX, dest);
 254 }
 255
 256
 257 void GLAPIENTRY
 258 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 259 {
 260    GET_CURRENT_CONTEXT(ctx);
 261
 262    if (MESA_VERBOSE&VERBOSE_API)
 263       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
 264
 265    if (ctx->Polygon.OffsetFactor == factor &&
 266        ctx->Polygon.OffsetUnits == units)
 267       return;
 268
 269    FLUSH_VERTICES(ctx, _NEW_POLYGON);
 270    ctx->Polygon.OffsetFactor = factor;
 271    ctx->Polygon.OffsetUnits = units;
 272
 273    if (ctx->Driver.PolygonOffset)
 274       ctx->Driver.PolygonOffset( ctx, factor, units );
 275 }
 276
 277
 278 void GLAPIENTRY
 279 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
 280 {
 281    GET_CURRENT_CONTEXT(ctx);
 282    /* XXX mult by DepthMaxF here??? */
 283    _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
 284 }
 285
 286
 287
 288 /**********************************************************************/
 289 /** \name Initialization */
 290 /*@{*/
 291
 292 /**
 293  * Initialize the context polygon state.
 294  *
 295  * \param ctx GL context.
 296  *
 297  * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
 298  * attribute groups.
 299  */
 300 void _mesa_init_polygon( struct gl_context * ctx )
 301 {
 302    /* Polygon group */
 303    ctx->Polygon.CullFlag = GL_FALSE;
 304    ctx->Polygon.CullFaceMode = GL_BACK;
 305    ctx->Polygon.FrontFace = GL_CCW;
 306    ctx->Polygon._FrontBit = 0;
 307    ctx->Polygon.FrontMode = GL_FILL;
 308    ctx->Polygon.BackMode = GL_FILL;
 309    ctx->Polygon.SmoothFlag = GL_FALSE;
 310    ctx->Polygon.StippleFlag = GL_FALSE;
 311    ctx->Polygon.OffsetFactor = 0.0F;
 312    ctx->Polygon.OffsetUnits = 0.0F;
 313    ctx->Polygon.OffsetPoint = GL_FALSE;
 314    ctx->Polygon.OffsetLine = GL_FALSE;
 315    ctx->Polygon.OffsetFill = GL_FALSE;
 316
 317
 318    /* Polygon Stipple group */
 319    memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 320 }
 321
 322 /*@}*/