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, _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_enum_to_string(mode));
  95
  96    if (ctx->Polygon.FrontFace == mode)
  97       return;
  98
  99    if (mode!=GL_CW && mode!=GL_CCW) {
 100       _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
 101       return;
 102    }
 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_enum_to_string(face),
 132                   _mesa_enum_to_string(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 && ctx->Polygon.BackMode == mode)
 152          return;
 153       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 154       ctx->Polygon.FrontMode = mode;
 155       ctx->Polygon.BackMode = mode;
 156       break;
 157    case GL_BACK:
 158       if (ctx->API == API_OPENGL_CORE) {
 159          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 160          return;
 161       }
 162       if (ctx->Polygon.BackMode == mode)
 163          return;
 164       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 165       ctx->Polygon.BackMode = mode;
 166       break;
 167    default:
 168       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 169       return;
 170    }
 171
 172    if (ctx->Driver.PolygonMode)
 173       ctx->Driver.PolygonMode(ctx, face, mode);
 174 }
 175
 176
 177 /**
 178  * Called by glPolygonStipple.
 179  */
 180 void GLAPIENTRY
 181 _mesa_PolygonStipple(const GLubyte *pattern)
 182 {
 183    GET_CURRENT_CONTEXT(ctx);
 184
 185    if (MESA_VERBOSE & VERBOSE_API)
 186       _mesa_debug(ctx, "glPolygonStipple\n");
 187
 188    FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
 189
 190    pattern = _mesa_map_validate_pbo_source(ctx, 2,
 191                                            &ctx->Unpack, 32, 32, 1,
 192                                            GL_COLOR_INDEX, GL_BITMAP,
 193                                            INT_MAX, pattern,
 194                                            "glPolygonStipple");
 195    if (!pattern)
 196       return;
 197
 198    _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
 199
 200    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 201
 202    if (ctx->Driver.PolygonStipple)
 203       ctx->Driver.PolygonStipple(ctx, pattern);
 204 }
 205
 206
 207 /**
 208  * Called by glPolygonStipple.
 209  */
 210 void GLAPIENTRY
 211 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
 212 {
 213    GET_CURRENT_CONTEXT(ctx);
 214
 215    if (MESA_VERBOSE&VERBOSE_API)
 216       _mesa_debug(ctx, "glGetPolygonStipple\n");
 217
 218    dest = _mesa_map_validate_pbo_dest(ctx, 2,
 219                                       &ctx->Pack, 32, 32, 1,
 220                                       GL_COLOR_INDEX, GL_BITMAP,
 221                                       bufSize, dest, "glGetPolygonStipple");
 222    if (!dest)
 223       return;
 224
 225    _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
 226
 227    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 228 }
 229
 230
 231 void GLAPIENTRY
 232 _mesa_GetPolygonStipple( GLubyte *dest )
 233 {
 234    _mesa_GetnPolygonStippleARB(INT_MAX, dest);
 235 }
 236
 237 void
 238 _mesa_polygon_offset_clamp(struct gl_context *ctx,
 239                            GLfloat factor, GLfloat units, GLfloat clamp)
 240 {
 241    if (ctx->Polygon.OffsetFactor == factor &&
 242        ctx->Polygon.OffsetUnits == units &&
 243        ctx->Polygon.OffsetClamp == clamp)
 244       return;
 245
 246    FLUSH_VERTICES(ctx, _NEW_POLYGON);
 247    ctx->Polygon.OffsetFactor = factor;
 248    ctx->Polygon.OffsetUnits = units;
 249    ctx->Polygon.OffsetClamp = clamp;
 250
 251    if (ctx->Driver.PolygonOffset)
 252       ctx->Driver.PolygonOffset( ctx, factor, units, clamp );
 253 }
 254
 255 void GLAPIENTRY
 256 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 257 {
 258    GET_CURRENT_CONTEXT(ctx);
 259
 260    if (MESA_VERBOSE&VERBOSE_API)
 261       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
 262
 263    _mesa_polygon_offset_clamp(ctx, factor, units, 0.0);
 264 }
 265
 266
 267 void GLAPIENTRY
 268 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
 269 {
 270    GET_CURRENT_CONTEXT(ctx);
 271    /* XXX mult by DepthMaxF here??? */
 272    _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
 273 }
 274
 275 void GLAPIENTRY
 276 _mesa_PolygonOffsetClampEXT( GLfloat factor, GLfloat units, GLfloat clamp )
 277 {
 278    GET_CURRENT_CONTEXT(ctx);
 279
 280    if (!ctx->Extensions.EXT_polygon_offset_clamp) {
 281       _mesa_error(ctx, GL_INVALID_OPERATION,
 282                   "unsupported function (glPolygonOffsetClampEXT) called");
 283       return;
 284    }
 285
 286    if (MESA_VERBOSE&VERBOSE_API)
 287       _mesa_debug(ctx, "glPolygonOffsetClampEXT %f %f %f\n", factor, units, clamp);
 288
 289    _mesa_polygon_offset_clamp(ctx, factor, units, clamp);
 290 }
 291
 292
 293
 294 /**********************************************************************/
 295 /** \name Initialization */
 296 /*@{*/
 297
 298 /**
 299  * Initialize the context polygon state.
 300  *
 301  * \param ctx GL context.
 302  *
 303  * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
 304  * attribute groups.
 305  */
 306 void _mesa_init_polygon( struct gl_context * ctx )
 307 {
 308    /* Polygon group */
 309    ctx->Polygon.CullFlag = GL_FALSE;
 310    ctx->Polygon.CullFaceMode = GL_BACK;
 311    ctx->Polygon.FrontFace = GL_CCW;
 312    ctx->Polygon._FrontBit = 0;
 313    ctx->Polygon.FrontMode = GL_FILL;
 314    ctx->Polygon.BackMode = GL_FILL;
 315    ctx->Polygon.SmoothFlag = GL_FALSE;
 316    ctx->Polygon.StippleFlag = GL_FALSE;
 317    ctx->Polygon.OffsetFactor = 0.0F;
 318    ctx->Polygon.OffsetUnits = 0.0F;
 319    ctx->Polygon.OffsetClamp = 0.0F;
 320    ctx->Polygon.OffsetPoint = GL_FALSE;
 321    ctx->Polygon.OffsetLine = GL_FALSE;
 322    ctx->Polygon.OffsetFill = GL_FALSE;
 323
 324
 325    /* Polygon Stipple group */
 326    memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 327 }
 328
 329 /*@}*/