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 "util/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 static ALWAYS_INLINE void
  54 cull_face(struct gl_context *ctx, GLenum mode, bool no_error)
  55 {
  56    if (ctx->Polygon.CullFaceMode == mode)
  57       return;
  58
  59    if (!no_error &&
  60        mode != GL_FRONT && mode != GL_BACK && mode != GL_FRONT_AND_BACK) {
  61       _mesa_error(ctx, GL_INVALID_ENUM, "glCullFace");
  62       return;
  63    }
  64
  65    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
  66    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
  67    ctx->Polygon.CullFaceMode = mode;
  68
  69    if (ctx->Driver.CullFace)
  70       ctx->Driver.CullFace(ctx, mode);
  71 }
  72
  73
  74 void GLAPIENTRY
  75 _mesa_CullFace_no_error(GLenum mode)
  76 {
  77    GET_CURRENT_CONTEXT(ctx);
  78    cull_face(ctx, mode, true);
  79 }
  80
  81
  82 void GLAPIENTRY
  83 _mesa_CullFace(GLenum mode)
  84 {
  85    GET_CURRENT_CONTEXT(ctx);
  86
  87    if (MESA_VERBOSE & VERBOSE_API)
  88       _mesa_debug(ctx, "glCullFace %s\n", _mesa_enum_to_string(mode));
  89
  90    cull_face(ctx, mode, false);
  91 }
  92
  93
  94 /**
  95  * Define front- and back-facing
  96  *
  97  * \param mode orientation of front-facing polygons.
  98  *
  99  * \sa glFrontFace().
 100  *
 101  * Verifies the parameter and updates gl_polygon_attrib::FrontFace. On change
 102  * flushes the vertices and notifies the driver via
 103  * the dd_function_table::FrontFace callback.
 104  */
 105 static ALWAYS_INLINE void
 106 front_face(struct gl_context *ctx, GLenum mode, bool no_error)
 107 {
 108    if (ctx->Polygon.FrontFace == mode)
 109       return;
 110
 111    if (!no_error && mode != GL_CW && mode != GL_CCW) {
 112       _mesa_error(ctx, GL_INVALID_ENUM, "glFrontFace");
 113       return;
 114    }
 115
 116    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 117    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 118    ctx->Polygon.FrontFace = mode;
 119
 120    if (ctx->Driver.FrontFace)
 121       ctx->Driver.FrontFace(ctx, mode);
 122 }
 123
 124
 125 void GLAPIENTRY
 126 _mesa_FrontFace_no_error(GLenum mode)
 127 {
 128    GET_CURRENT_CONTEXT(ctx);
 129    front_face(ctx, mode, true);
 130 }
 131
 132
 133 void GLAPIENTRY
 134 _mesa_FrontFace(GLenum mode)
 135 {
 136    GET_CURRENT_CONTEXT(ctx);
 137
 138    if (MESA_VERBOSE & VERBOSE_API)
 139       _mesa_debug(ctx, "glFrontFace %s\n", _mesa_enum_to_string(mode));
 140
 141    front_face(ctx, mode, false);
 142 }
 143
 144
 145 /**
 146  * Set the polygon rasterization mode.
 147  *
 148  * \param face the polygons which \p mode applies to.
 149  * \param mode how polygons should be rasterized.
 150  *
 151  * \sa glPolygonMode().
 152  *
 153  * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
 154  * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
 155  * driver via the dd_function_table::PolygonMode callback.
 156  */
 157 static ALWAYS_INLINE void
 158 polygon_mode(struct gl_context *ctx, GLenum face, GLenum mode, bool no_error)
 159 {
 160    if (MESA_VERBOSE & VERBOSE_API)
 161       _mesa_debug(ctx, "glPolygonMode %s %s\n",
 162                   _mesa_enum_to_string(face),
 163                   _mesa_enum_to_string(mode));
 164
 165    if (!no_error) {
 166       switch (mode) {
 167       case GL_POINT:
 168       case GL_LINE:
 169       case GL_FILL:
 170          break;
 171       case GL_FILL_RECTANGLE_NV:
 172          if (ctx->Extensions.NV_fill_rectangle)
 173             break;
 174          /* fall-through */
 175       default:
 176          _mesa_error(ctx, GL_INVALID_ENUM, "glPolygonMode(mode)");
 177          return;
 178       }
 179    }
 180
 181    switch (face) {
 182    case GL_FRONT:
 183       if (!no_error && ctx->API == API_OPENGL_CORE) {
 184          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 185          return;
 186       }
 187       if (ctx->Polygon.FrontMode == mode)
 188          return;
 189       FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 190       ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 191       ctx->Polygon.FrontMode = mode;
 192       break;
 193    case GL_FRONT_AND_BACK:
 194       if (ctx->Polygon.FrontMode == mode && ctx->Polygon.BackMode == mode)
 195          return;
 196       FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 197       ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 198       ctx->Polygon.FrontMode = mode;
 199       ctx->Polygon.BackMode = mode;
 200       break;
 201    case GL_BACK:
 202       if (!no_error && ctx->API == API_OPENGL_CORE) {
 203          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 204          return;
 205       }
 206       if (ctx->Polygon.BackMode == mode)
 207          return;
 208       FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 209       ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 210       ctx->Polygon.BackMode = mode;
 211       break;
 212    default:
 213       if (!no_error)
 214          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 215       return;
 216    }
 217
 218    if (ctx->Driver.PolygonMode)
 219       ctx->Driver.PolygonMode(ctx, face, mode);
 220 }
 221
 222
 223 void GLAPIENTRY
 224 _mesa_PolygonMode_no_error(GLenum face, GLenum mode)
 225 {
 226    GET_CURRENT_CONTEXT(ctx);
 227    polygon_mode(ctx, face, mode, true);
 228 }
 229
 230
 231 void GLAPIENTRY
 232 _mesa_PolygonMode(GLenum face, GLenum mode)
 233 {
 234    GET_CURRENT_CONTEXT(ctx);
 235    polygon_mode(ctx, face, mode, false);
 236 }
 237
 238
 239 /**
 240  * Called by glPolygonStipple.
 241  */
 242 void GLAPIENTRY
 243 _mesa_PolygonStipple(const GLubyte *pattern)
 244 {
 245    GET_CURRENT_CONTEXT(ctx);
 246
 247    if (MESA_VERBOSE & VERBOSE_API)
 248       _mesa_debug(ctx, "glPolygonStipple\n");
 249
 250    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonStipple ? 0 :
 251                                                       _NEW_POLYGONSTIPPLE);
 252    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonStipple;
 253
 254    pattern = _mesa_map_validate_pbo_source(ctx, 2,
 255                                            &ctx->Unpack, 32, 32, 1,
 256                                            GL_COLOR_INDEX, GL_BITMAP,
 257                                            INT_MAX, pattern,
 258                                            "glPolygonStipple");
 259    if (!pattern)
 260       return;
 261
 262    _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
 263
 264    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 265
 266    if (ctx->Driver.PolygonStipple)
 267       ctx->Driver.PolygonStipple(ctx, pattern);
 268 }
 269
 270
 271 /**
 272  * Called by glPolygonStipple.
 273  */
 274 void GLAPIENTRY
 275 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
 276 {
 277    GET_CURRENT_CONTEXT(ctx);
 278
 279    if (MESA_VERBOSE&VERBOSE_API)
 280       _mesa_debug(ctx, "glGetPolygonStipple\n");
 281
 282    dest = _mesa_map_validate_pbo_dest(ctx, 2,
 283                                       &ctx->Pack, 32, 32, 1,
 284                                       GL_COLOR_INDEX, GL_BITMAP,
 285                                       bufSize, dest, "glGetPolygonStipple");
 286    if (!dest)
 287       return;
 288
 289    _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
 290
 291    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 292 }
 293
 294
 295 void GLAPIENTRY
 296 _mesa_GetPolygonStipple( GLubyte *dest )
 297 {
 298    _mesa_GetnPolygonStippleARB(INT_MAX, dest);
 299 }
 300
 301 void
 302 _mesa_polygon_offset_clamp(struct gl_context *ctx,
 303                            GLfloat factor, GLfloat units, GLfloat clamp)
 304 {
 305    if (ctx->Polygon.OffsetFactor == factor &&
 306        ctx->Polygon.OffsetUnits == units &&
 307        ctx->Polygon.OffsetClamp == clamp)
 308       return;
 309
 310    FLUSH_VERTICES(ctx, ctx->DriverFlags.NewPolygonState ? 0 : _NEW_POLYGON);
 311    ctx->NewDriverState |= ctx->DriverFlags.NewPolygonState;
 312    ctx->Polygon.OffsetFactor = factor;
 313    ctx->Polygon.OffsetUnits = units;
 314    ctx->Polygon.OffsetClamp = clamp;
 315
 316    if (ctx->Driver.PolygonOffset)
 317       ctx->Driver.PolygonOffset( ctx, factor, units, clamp );
 318 }
 319
 320 void GLAPIENTRY
 321 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 322 {
 323    GET_CURRENT_CONTEXT(ctx);
 324
 325    if (MESA_VERBOSE&VERBOSE_API)
 326       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
 327
 328    _mesa_polygon_offset_clamp(ctx, factor, units, 0.0);
 329 }
 330
 331 void GLAPIENTRY
 332 _mesa_PolygonOffsetClampEXT( GLfloat factor, GLfloat units, GLfloat clamp )
 333 {
 334    GET_CURRENT_CONTEXT(ctx);
 335
 336    if (!ctx->Extensions.ARB_polygon_offset_clamp) {
 337       _mesa_error(ctx, GL_INVALID_OPERATION,
 338                   "unsupported function (%s) called", "glPolygonOffsetClamp");
 339       return;
 340    }
 341
 342    if (MESA_VERBOSE&VERBOSE_API)
 343       _mesa_debug(ctx, "glPolygonOffsetClamp %f %f %f\n", factor, units, clamp);
 344
 345    _mesa_polygon_offset_clamp(ctx, factor, units, clamp);
 346 }
 347
 348 /**********************************************************************/
 349 /** \name Initialization */
 350 /*@{*/
 351
 352 /**
 353  * Initialize the context polygon state.
 354  *
 355  * \param ctx GL context.
 356  *
 357  * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
 358  * attribute groups.
 359  */
 360 void _mesa_init_polygon( struct gl_context * ctx )
 361 {
 362    /* Polygon group */
 363    ctx->Polygon.CullFlag = GL_FALSE;
 364    ctx->Polygon.CullFaceMode = GL_BACK;
 365    ctx->Polygon.FrontFace = GL_CCW;
 366    ctx->Polygon.FrontMode = GL_FILL;
 367    ctx->Polygon.BackMode = GL_FILL;
 368    ctx->Polygon.SmoothFlag = GL_FALSE;
 369    ctx->Polygon.StippleFlag = GL_FALSE;
 370    ctx->Polygon.OffsetFactor = 0.0F;
 371    ctx->Polygon.OffsetUnits = 0.0F;
 372    ctx->Polygon.OffsetClamp = 0.0F;
 373    ctx->Polygon.OffsetPoint = GL_FALSE;
 374    ctx->Polygon.OffsetLine = GL_FALSE;
 375    ctx->Polygon.OffsetFill = GL_FALSE;
 376
 377
 378    /* Polygon Stipple group */
 379    memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 380 }
 381
 382 /*@}*/