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    ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);
 108
 109    if (ctx->Driver.FrontFace)
 110       ctx->Driver.FrontFace( ctx, mode );
 111 }
 112
 113
 114 /**
 115  * Set the polygon rasterization mode.
 116  *
 117  * \param face the polygons which \p mode applies to.
 118  * \param mode how polygons should be rasterized.
 119  *
 120  * \sa glPolygonMode().
 121  *
 122  * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
 123  * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
 124  * driver via the dd_function_table::PolygonMode callback.
 125  */
 126 void GLAPIENTRY
 127 _mesa_PolygonMode( GLenum face, GLenum mode )
 128 {
 129    GET_CURRENT_CONTEXT(ctx);
 130
 131    if (MESA_VERBOSE&VERBOSE_API)
 132       _mesa_debug(ctx, "glPolygonMode %s %s\n",
 133                   _mesa_lookup_enum_by_nr(face),
 134                   _mesa_lookup_enum_by_nr(mode));
 135
 136    if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
 137       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
 138       return;
 139    }
 140
 141    switch (face) {
 142    case GL_FRONT:
 143       if (ctx->API == API_OPENGL_CORE) {
 144          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 145          return;
 146       }
 147       if (ctx->Polygon.FrontMode == mode)
 148          return;
 149       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 150       ctx->Polygon.FrontMode = mode;
 151       break;
 152    case GL_FRONT_AND_BACK:
 153       if (ctx->Polygon.FrontMode == mode &&
 154           ctx->Polygon.BackMode == mode)
 155          return;
 156       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 157       ctx->Polygon.FrontMode = mode;
 158       ctx->Polygon.BackMode = mode;
 159       break;
 160    case GL_BACK:
 161       if (ctx->API == API_OPENGL_CORE) {
 162          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 163          return;
 164       }
 165       if (ctx->Polygon.BackMode == mode)
 166          return;
 167       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 168       ctx->Polygon.BackMode = mode;
 169       break;
 170    default:
 171       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 172       return;
 173    }
 174
 175    if (ctx->Driver.PolygonMode)
 176       ctx->Driver.PolygonMode(ctx, face, mode);
 177 }
 178
 179
 180 /**
 181  * This routine updates the ctx->Polygon.Stipple state.
 182  * If we're getting the stipple data from a PBO, we map the buffer
 183  * in order to access the data.
 184  * In any case, we obey the current pixel unpacking parameters when fetching
 185  * the stipple data.
 186  *
 187  * In the future, this routine should be used as a fallback, called via
 188  * ctx->Driver.PolygonStipple().  We'll have to update all the DRI drivers
 189  * too.
 190  */
 191 void
 192 _mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern)
 193 {
 194    pattern = _mesa_map_validate_pbo_source(ctx, 2,
 195                                            &ctx->Unpack, 32, 32, 1,
 196                                            GL_COLOR_INDEX, GL_BITMAP,
 197                                            INT_MAX, pattern,
 198                                            "glPolygonStipple");
 199    if (!pattern)
 200       return;
 201
 202    _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
 203
 204    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 205 }
 206
 207
 208 /**
 209  * Called by glPolygonStipple.
 210  */
 211 void GLAPIENTRY
 212 _mesa_PolygonStipple( const GLubyte *pattern )
 213 {
 214    GET_CURRENT_CONTEXT(ctx);
 215
 216    if (MESA_VERBOSE&VERBOSE_API)
 217       _mesa_debug(ctx, "glPolygonStipple\n");
 218
 219    FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
 220
 221    _mesa_polygon_stipple(ctx, pattern);
 222
 223    if (ctx->Driver.PolygonStipple)
 224       ctx->Driver.PolygonStipple(ctx, pattern);
 225 }
 226
 227
 228 /**
 229  * Called by glPolygonStipple.
 230  */
 231 void GLAPIENTRY
 232 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
 233 {
 234    GET_CURRENT_CONTEXT(ctx);
 235
 236    if (MESA_VERBOSE&VERBOSE_API)
 237       _mesa_debug(ctx, "glGetPolygonStipple\n");
 238
 239    dest = _mesa_map_validate_pbo_dest(ctx, 2,
 240                                       &ctx->Pack, 32, 32, 1,
 241                                       GL_COLOR_INDEX, GL_BITMAP,
 242                                       bufSize, dest, "glGetPolygonStipple");
 243    if (!dest)
 244       return;
 245
 246    _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
 247
 248    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 249 }
 250
 251
 252 void GLAPIENTRY
 253 _mesa_GetPolygonStipple( GLubyte *dest )
 254 {
 255    _mesa_GetnPolygonStippleARB(INT_MAX, dest);
 256 }
 257
 258
 259 void GLAPIENTRY
 260 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 261 {
 262    GET_CURRENT_CONTEXT(ctx);
 263
 264    if (MESA_VERBOSE&VERBOSE_API)
 265       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
 266
 267    if (ctx->Polygon.OffsetFactor == factor &&
 268        ctx->Polygon.OffsetUnits == units)
 269       return;
 270
 271    FLUSH_VERTICES(ctx, _NEW_POLYGON);
 272    ctx->Polygon.OffsetFactor = factor;
 273    ctx->Polygon.OffsetUnits = units;
 274
 275    if (ctx->Driver.PolygonOffset)
 276       ctx->Driver.PolygonOffset( ctx, factor, units );
 277 }
 278
 279
 280 void GLAPIENTRY
 281 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
 282 {
 283    GET_CURRENT_CONTEXT(ctx);
 284    /* XXX mult by DepthMaxF here??? */
 285    _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
 286 }
 287
 288
 289
 290 /**********************************************************************/
 291 /** \name Initialization */
 292 /*@{*/
 293
 294 /**
 295  * Initialize the context polygon state.
 296  *
 297  * \param ctx GL context.
 298  *
 299  * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
 300  * attribute groups.
 301  */
 302 void _mesa_init_polygon( struct gl_context * ctx )
 303 {
 304    /* Polygon group */
 305    ctx->Polygon.CullFlag = GL_FALSE;
 306    ctx->Polygon.CullFaceMode = GL_BACK;
 307    ctx->Polygon.FrontFace = GL_CCW;
 308    ctx->Polygon._FrontBit = 0;
 309    ctx->Polygon.FrontMode = GL_FILL;
 310    ctx->Polygon.BackMode = GL_FILL;
 311    ctx->Polygon.SmoothFlag = GL_FALSE;
 312    ctx->Polygon.StippleFlag = GL_FALSE;
 313    ctx->Polygon.OffsetFactor = 0.0F;
 314    ctx->Polygon.OffsetUnits = 0.0F;
 315    ctx->Polygon.OffsetPoint = GL_FALSE;
 316    ctx->Polygon.OffsetLine = GL_FALSE;
 317    ctx->Polygon.OffsetFill = GL_FALSE;
 318
 319
 320    /* Polygon Stipple group */
 321    memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 322 }
 323
 324 /*@}*/