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