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_enum_to_string(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, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
  70    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
  71    ctx->Polygon.CullFaceMode = mode;
  72
  73    if (ctx->Driver.CullFace)
  74       ctx->Driver.CullFace( ctx, mode );
  75 }
  76
  77
  78 /**
  79  * Define front- and back-facing
  80  *
  81  * \param mode orientation of front-facing polygons.
  82  *
  83  * \sa glFrontFace().
  84  *
  85  * Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change
  86  * flushes the vertices and notifies the driver via
  87  * the dd_function_table::FrontFace callback.
  88  */
  89 void GLAPIENTRY
  90 _mesa_FrontFace( GLenum mode )
  91 {
  92    GET_CURRENT_CONTEXT(ctx);
  93
  94    if (MESA_VERBOSE&VERBOSE_API)
  95       _mesa_debug(ctx, "glFrontFace %s\n", _mesa_enum_to_string(mode));
  96
  97    if (ctx->Polygon.FrontFace == mode)
  98       return;
  99
 100    if (mode!=GL_CW && mode!=GL_CCW) {
 101       _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
 102       return;
 103    }
 104
 105    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 106    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 107    ctx->Polygon.FrontFace = mode;
 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_enum_to_string(face),
 134                   _mesa_enum_to_string(mode));
 135
 136    switch (mode) {
 137    case GL_POINT:
 138    case GL_LINE:
 139    case GL_FILL:
 140       break;
 141    case GL_FILL_RECTANGLE_NV:
 142       if (ctx->Extensions.NV_fill_rectangle)
 143          break;
 144       /* fall-through */
 145    default:
 146       _mesa_error(ctx, GL_INVALID_ENUM, "glPolygonMode(mode)");
 147       return;
 148    }
 149
 150    switch (face) {
 151    case GL_FRONT:
 152       if (ctx->API == API_OPENGL_CORE) {
 153          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 154          return;
 155       }
 156       if (ctx->Polygon.FrontMode == mode)
 157          return;
 158       FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 159       ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 160       ctx->Polygon.FrontMode = mode;
 161       break;
 162    case GL_FRONT_AND_BACK:
 163       if (ctx->Polygon.FrontMode == mode && ctx->Polygon.BackMode == mode)
 164          return;
 165       FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 166       ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 167       ctx->Polygon.FrontMode = mode;
 168       ctx->Polygon.BackMode = mode;
 169       break;
 170    case GL_BACK:
 171       if (ctx->API == API_OPENGL_CORE) {
 172          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 173          return;
 174       }
 175       if (ctx->Polygon.BackMode == mode)
 176          return;
 177       FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 178       ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 179       ctx->Polygon.BackMode = mode;
 180       break;
 181    default:
 182       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 183       return;
 184    }
 185
 186    if (ctx->Driver.PolygonMode)
 187       ctx->Driver.PolygonMode(ctx, face, mode);
 188 }
 189
 190
 191 /**
 192  * Called by glPolygonStipple.
 193  */
 194 void GLAPIENTRY
 195 _mesa_PolygonStipple(const GLubyte *pattern)
 196 {
 197    GET_CURRENT_CONTEXT(ctx);
 198
 199    if (MESA_VERBOSE & VERBOSE_API)
 200       _mesa_debug(ctx, "glPolygonStipple\n");
 201
 202    FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
 203
 204    pattern = _mesa_map_validate_pbo_source(ctx, 2,
 205                                            &ctx->Unpack, 32, 32, 1,
 206                                            GL_COLOR_INDEX, GL_BITMAP,
 207                                            INT_MAX, pattern,
 208                                            "glPolygonStipple");
 209    if (!pattern)
 210       return;
 211
 212    _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
 213
 214    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 215
 216    if (ctx->Driver.PolygonStipple)
 217       ctx->Driver.PolygonStipple(ctx, pattern);
 218 }
 219
 220
 221 /**
 222  * Called by glPolygonStipple.
 223  */
 224 void GLAPIENTRY
 225 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
 226 {
 227    GET_CURRENT_CONTEXT(ctx);
 228
 229    if (MESA_VERBOSE&VERBOSE_API)
 230       _mesa_debug(ctx, "glGetPolygonStipple\n");
 231
 232    dest = _mesa_map_validate_pbo_dest(ctx, 2,
 233                                       &ctx->Pack, 32, 32, 1,
 234                                       GL_COLOR_INDEX, GL_BITMAP,
 235                                       bufSize, dest, "glGetPolygonStipple");
 236    if (!dest)
 237       return;
 238
 239    _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
 240
 241    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 242 }
 243
 244
 245 void GLAPIENTRY
 246 _mesa_GetPolygonStipple( GLubyte *dest )
 247 {
 248    _mesa_GetnPolygonStippleARB(INT_MAX, dest);
 249 }
 250
 251 void
 252 _mesa_polygon_offset_clamp(struct gl_context *ctx,
 253                            GLfloat factor, GLfloat units, GLfloat clamp)
 254 {
 255    if (ctx->Polygon.OffsetFactor == factor &&
 256        ctx->Polygon.OffsetUnits == units &&
 257        ctx->Polygon.OffsetClamp == clamp)
 258       return;
 259
 260    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 261    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 262    ctx->Polygon.OffsetFactor = factor;
 263    ctx->Polygon.OffsetUnits = units;
 264    ctx->Polygon.OffsetClamp = clamp;
 265
 266    if (ctx->Driver.PolygonOffset)
 267       ctx->Driver.PolygonOffset( ctx, factor, units, clamp );
 268 }
 269
 270 void GLAPIENTRY
 271 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 272 {
 273    GET_CURRENT_CONTEXT(ctx);
 274
 275    if (MESA_VERBOSE&VERBOSE_API)
 276       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
 277
 278    _mesa_polygon_offset_clamp(ctx, factor, units, 0.0);
 279 }
 280
 281
 282 void GLAPIENTRY
 283 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
 284 {
 285    GET_CURRENT_CONTEXT(ctx);
 286    /* XXX mult by DepthMaxF here??? */
 287    _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
 288 }
 289
 290 void GLAPIENTRY
 291 _mesa_PolygonOffsetClampEXT( GLfloat factor, GLfloat units, GLfloat clamp )
 292 {
 293    GET_CURRENT_CONTEXT(ctx);
 294
 295    if (!ctx->Extensions.EXT_polygon_offset_clamp) {
 296       _mesa_error(ctx, GL_INVALID_OPERATION,
 297                   "unsupported function (glPolygonOffsetClampEXT) called");
 298       return;
 299    }
 300
 301    if (MESA_VERBOSE&VERBOSE_API)
 302       _mesa_debug(ctx, "glPolygonOffsetClampEXT %f %f %f\n", factor, units, clamp);
 303
 304    _mesa_polygon_offset_clamp(ctx, factor, units, clamp);
 305 }
 306
 307
 308
 309 /**********************************************************************/
 310 /** \name Initialization */
 311 /*@{*/
 312
 313 /**
 314  * Initialize the context polygon state.
 315  *
 316  * \param ctx GL context.
 317  *
 318  * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
 319  * attribute groups.
 320  */
 321 void _mesa_init_polygon( struct gl_context * ctx )
 322 {
 323    /* Polygon group */
 324    ctx->Polygon.CullFlag = GL_FALSE;
 325    ctx->Polygon.CullFaceMode = GL_BACK;
 326    ctx->Polygon.FrontFace = GL_CCW;
 327    ctx->Polygon.FrontMode = GL_FILL;
 328    ctx->Polygon.BackMode = GL_FILL;
 329    ctx->Polygon.SmoothFlag = GL_FALSE;
 330    ctx->Polygon.StippleFlag = GL_FALSE;
 331    ctx->Polygon.OffsetFactor = 0.0F;
 332    ctx->Polygon.OffsetUnits = 0.0F;
 333    ctx->Polygon.OffsetClamp = 0.0F;
 334    ctx->Polygon.OffsetPoint = GL_FALSE;
 335    ctx->Polygon.OffsetLine = GL_FALSE;
 336    ctx->Polygon.OffsetFill = GL_FALSE;
 337
 338
 339    /* Polygon Stipple group */
 340    memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 341 }
 342
 343 /*@}*/