src/mesa/main/polygon.c

   1 /**
   2  * \file polygon.c
   3  * Polygon operations.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  * Version:  6.5.1
   9  *
  10  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a
  13  * copy of this software and associated documentation files (the "Software"),
  14  * to deal in the Software without restriction, including without limitation
  15  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  16  * and/or sell copies of the Software, and to permit persons to whom the
  17  * Software is furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included
  20  * in all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  23  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  28  * OTHER DEALINGS IN THE SOFTWARE.
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "imports.h"
  34 #include "context.h"
  35 #include "image.h"
  36 #include "enums.h"
  37 #include "pack.h"
  38 #include "pbo.h"
  39 #include "polygon.h"
  40 #include "mtypes.h"
  41
  42
  43 /**
  44  * Specify whether to cull front- or back-facing facets.
  45  *
  46  * \param mode culling mode.
  47  *
  48  * \sa glCullFace().
  49  *
  50  * Verifies the parameter and updates gl_polygon_attrib::CullFaceMode. On
  51  * change, flushes the vertices and notifies the driver via
  52  * the dd_function_table::CullFace callback.
  53  */
  54 void GLAPIENTRY
  55 _mesa_CullFace( GLenum mode )
  56 {
  57    GET_CURRENT_CONTEXT(ctx);
  58
  59    if (MESA_VERBOSE&VERBOSE_API)
  60       _mesa_debug(ctx, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode));
  61
  62    if (mode!=GL_FRONT && mode!=GL_BACK && mode!=GL_FRONT_AND_BACK) {
  63       _mesa_error( ctx, GL_INVALID_ENUM, "glCullFace" );
  64       return;
  65    }
  66
  67    if (ctx->Polygon.CullFaceMode == mode)
  68       return;
  69
  70    FLUSH_VERTICES(ctx, _NEW_POLYGON);
  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_lookup_enum_by_nr(mode));
  96
  97    if (mode!=GL_CW && mode!=GL_CCW) {
  98       _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
  99       return;
 100    }
 101
 102    if (ctx->Polygon.FrontFace == mode)
 103       return;
 104
 105    FLUSH_VERTICES(ctx, _NEW_POLYGON);
 106    ctx->Polygon.FrontFace = mode;
 107
 108    ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);
 109
 110    if (ctx->Driver.FrontFace)
 111       ctx->Driver.FrontFace( ctx, mode );
 112 }
 113
 114
 115 /**
 116  * Set the polygon rasterization mode.
 117  *
 118  * \param face the polygons which \p mode applies to.
 119  * \param mode how polygons should be rasterized.
 120  *
 121  * \sa glPolygonMode().
 122  *
 123  * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
 124  * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
 125  * driver via the dd_function_table::PolygonMode callback.
 126  */
 127 void GLAPIENTRY
 128 _mesa_PolygonMode( GLenum face, GLenum mode )
 129 {
 130    GET_CURRENT_CONTEXT(ctx);
 131
 132    if (MESA_VERBOSE&VERBOSE_API)
 133       _mesa_debug(ctx, "glPolygonMode %s %s\n",
 134                   _mesa_lookup_enum_by_nr(face),
 135                   _mesa_lookup_enum_by_nr(mode));
 136
 137    if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
 138       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
 139       return;
 140    }
 141
 142    switch (face) {
 143    case GL_FRONT:
 144       if (ctx->API == API_OPENGL_CORE) {
 145          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 146          return;
 147       }
 148       if (ctx->Polygon.FrontMode == mode)
 149          return;
 150       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 151       ctx->Polygon.FrontMode = mode;
 152       break;
 153    case GL_FRONT_AND_BACK:
 154       if (ctx->Polygon.FrontMode == mode &&
 155           ctx->Polygon.BackMode == mode)
 156          return;
 157       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 158       ctx->Polygon.FrontMode = mode;
 159       ctx->Polygon.BackMode = mode;
 160       break;
 161    case GL_BACK:
 162       if (ctx->API == API_OPENGL_CORE) {
 163          _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 164          return;
 165       }
 166       if (ctx->Polygon.BackMode == mode)
 167          return;
 168       FLUSH_VERTICES(ctx, _NEW_POLYGON);
 169       ctx->Polygon.BackMode = mode;
 170       break;
 171    default:
 172       _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
 173       return;
 174    }
 175
 176    if (ctx->Driver.PolygonMode)
 177       ctx->Driver.PolygonMode(ctx, face, mode);
 178 }
 179
 180
 181 /**
 182  * This routine updates the ctx->Polygon.Stipple state.
 183  * If we're getting the stipple data from a PBO, we map the buffer
 184  * in order to access the data.
 185  * In any case, we obey the current pixel unpacking parameters when fetching
 186  * the stipple data.
 187  *
 188  * In the future, this routine should be used as a fallback, called via
 189  * ctx->Driver.PolygonStipple().  We'll have to update all the DRI drivers
 190  * too.
 191  */
 192 void
 193 _mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern)
 194 {
 195    pattern = _mesa_map_validate_pbo_source(ctx, 2,
 196                                            &ctx->Unpack, 32, 32, 1,
 197                                            GL_COLOR_INDEX, GL_BITMAP,
 198                                            INT_MAX, pattern,
 199                                            "glPolygonStipple");
 200    if (!pattern)
 201       return;
 202
 203    _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
 204
 205    _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
 206 }
 207
 208
 209 /**
 210  * Called by glPolygonStipple.
 211  */
 212 void GLAPIENTRY
 213 _mesa_PolygonStipple( const GLubyte *pattern )
 214 {
 215    GET_CURRENT_CONTEXT(ctx);
 216
 217    if (MESA_VERBOSE&VERBOSE_API)
 218       _mesa_debug(ctx, "glPolygonStipple\n");
 219
 220    FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
 221
 222    _mesa_polygon_stipple(ctx, pattern);
 223
 224    if (ctx->Driver.PolygonStipple)
 225       ctx->Driver.PolygonStipple(ctx, pattern);
 226 }
 227
 228
 229 /**
 230  * Called by glPolygonStipple.
 231  */
 232 void GLAPIENTRY
 233 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
 234 {
 235    GET_CURRENT_CONTEXT(ctx);
 236
 237    if (MESA_VERBOSE&VERBOSE_API)
 238       _mesa_debug(ctx, "glGetPolygonStipple\n");
 239
 240    dest = _mesa_map_validate_pbo_dest(ctx, 2,
 241                                       &ctx->Pack, 32, 32, 1,
 242                                       GL_COLOR_INDEX, GL_BITMAP,
 243                                       bufSize, dest, "glGetPolygonStipple");
 244    if (!dest)
 245       return;
 246
 247    _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
 248
 249    _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
 250 }
 251
 252
 253 void GLAPIENTRY
 254 _mesa_GetPolygonStipple( GLubyte *dest )
 255 {
 256    _mesa_GetnPolygonStippleARB(INT_MAX, dest);
 257 }
 258
 259
 260 void GLAPIENTRY
 261 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
 262 {
 263    GET_CURRENT_CONTEXT(ctx);
 264
 265    if (MESA_VERBOSE&VERBOSE_API)
 266       _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
 267
 268    if (ctx->Polygon.OffsetFactor == factor &&
 269        ctx->Polygon.OffsetUnits == units)
 270       return;
 271
 272    FLUSH_VERTICES(ctx, _NEW_POLYGON);
 273    ctx->Polygon.OffsetFactor = factor;
 274    ctx->Polygon.OffsetUnits = units;
 275
 276    if (ctx->Driver.PolygonOffset)
 277       ctx->Driver.PolygonOffset( ctx, factor, units );
 278 }
 279
 280
 281 void GLAPIENTRY
 282 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
 283 {
 284    GET_CURRENT_CONTEXT(ctx);
 285    /* XXX mult by DepthMaxF here??? */
 286    _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
 287 }
 288
 289
 290
 291 /**********************************************************************/
 292 /** \name Initialization */
 293 /*@{*/
 294
 295 /**
 296  * Initialize the context polygon state.
 297  *
 298  * \param ctx GL context.
 299  *
 300  * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
 301  * attribute groups.
 302  */
 303 void _mesa_init_polygon( struct gl_context * ctx )
 304 {
 305    /* Polygon group */
 306    ctx->Polygon.CullFlag = GL_FALSE;
 307    ctx->Polygon.CullFaceMode = GL_BACK;
 308    ctx->Polygon.FrontFace = GL_CCW;
 309    ctx->Polygon._FrontBit = 0;
 310    ctx->Polygon.FrontMode = GL_FILL;
 311    ctx->Polygon.BackMode = GL_FILL;
 312    ctx->Polygon.SmoothFlag = GL_FALSE;
 313    ctx->Polygon.StippleFlag = GL_FALSE;
 314    ctx->Polygon.OffsetFactor = 0.0F;
 315    ctx->Polygon.OffsetUnits = 0.0F;
 316    ctx->Polygon.OffsetPoint = GL_FALSE;
 317    ctx->Polygon.OffsetLine = GL_FALSE;
 318    ctx->Polygon.OffsetFill = GL_FALSE;
 319
 320
 321    /* Polygon Stipple group */
 322    memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
 323 }
 324
 325 /*@}*/