7 * Mesa 3-D graphics library
10 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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:
19 * The above copyright notice and this permission notice shall be included
20 * in all copies or substantial portions of the Software.
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.
44 * Specify whether to cull front- or back-facing facets.
46 * \param mode culling mode.
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.
55 _mesa_CullFace( GLenum mode
)
57 GET_CURRENT_CONTEXT(ctx
);
59 if (MESA_VERBOSE
&VERBOSE_API
)
60 _mesa_debug(ctx
, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode
));
62 if (mode
!=GL_FRONT
&& mode
!=GL_BACK
&& mode
!=GL_FRONT_AND_BACK
) {
63 _mesa_error( ctx
, GL_INVALID_ENUM
, "glCullFace" );
67 if (ctx
->Polygon
.CullFaceMode
== mode
)
70 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
71 ctx
->Polygon
.CullFaceMode
= mode
;
73 if (ctx
->Driver
.CullFace
)
74 ctx
->Driver
.CullFace( ctx
, mode
);
79 * Define front- and back-facing
81 * \param mode orientation of front-facing polygons.
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.
90 _mesa_FrontFace( GLenum mode
)
92 GET_CURRENT_CONTEXT(ctx
);
94 if (MESA_VERBOSE
&VERBOSE_API
)
95 _mesa_debug(ctx
, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode
));
97 if (mode
!=GL_CW
&& mode
!=GL_CCW
) {
98 _mesa_error( ctx
, GL_INVALID_ENUM
, "glFrontFace" );
102 if (ctx
->Polygon
.FrontFace
== mode
)
105 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
106 ctx
->Polygon
.FrontFace
= mode
;
108 ctx
->Polygon
._FrontBit
= (GLboolean
) (mode
== GL_CW
);
110 if (ctx
->Driver
.FrontFace
)
111 ctx
->Driver
.FrontFace( ctx
, mode
);
116 * Set the polygon rasterization mode.
118 * \param face the polygons which \p mode applies to.
119 * \param mode how polygons should be rasterized.
121 * \sa glPolygonMode().
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.
128 _mesa_PolygonMode( GLenum face
, GLenum mode
)
130 GET_CURRENT_CONTEXT(ctx
);
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
));
137 if (mode
!=GL_POINT
&& mode
!=GL_LINE
&& mode
!=GL_FILL
) {
138 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(mode)" );
144 if (ctx
->API
== API_OPENGL_CORE
) {
145 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(face)" );
148 if (ctx
->Polygon
.FrontMode
== mode
)
150 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
151 ctx
->Polygon
.FrontMode
= mode
;
153 case GL_FRONT_AND_BACK
:
154 if (ctx
->Polygon
.FrontMode
== mode
&&
155 ctx
->Polygon
.BackMode
== mode
)
157 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
158 ctx
->Polygon
.FrontMode
= mode
;
159 ctx
->Polygon
.BackMode
= mode
;
162 if (ctx
->API
== API_OPENGL_CORE
) {
163 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(face)" );
166 if (ctx
->Polygon
.BackMode
== mode
)
168 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
169 ctx
->Polygon
.BackMode
= mode
;
172 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(face)" );
176 if (ctx
->Driver
.PolygonMode
)
177 ctx
->Driver
.PolygonMode(ctx
, face
, mode
);
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
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
193 _mesa_polygon_stipple(struct gl_context
*ctx
, const GLubyte
*pattern
)
195 pattern
= _mesa_map_validate_pbo_source(ctx
, 2,
196 &ctx
->Unpack
, 32, 32, 1,
197 GL_COLOR_INDEX
, GL_BITMAP
,
203 _mesa_unpack_polygon_stipple(pattern
, ctx
->PolygonStipple
, &ctx
->Unpack
);
205 _mesa_unmap_pbo_source(ctx
, &ctx
->Unpack
);
210 * Called by glPolygonStipple.
213 _mesa_PolygonStipple( const GLubyte
*pattern
)
215 GET_CURRENT_CONTEXT(ctx
);
217 if (MESA_VERBOSE
&VERBOSE_API
)
218 _mesa_debug(ctx
, "glPolygonStipple\n");
220 FLUSH_VERTICES(ctx
, _NEW_POLYGONSTIPPLE
);
222 _mesa_polygon_stipple(ctx
, pattern
);
224 if (ctx
->Driver
.PolygonStipple
)
225 ctx
->Driver
.PolygonStipple(ctx
, pattern
);
230 * Called by glPolygonStipple.
233 _mesa_GetnPolygonStippleARB( GLsizei bufSize
, GLubyte
*dest
)
235 GET_CURRENT_CONTEXT(ctx
);
237 if (MESA_VERBOSE
&VERBOSE_API
)
238 _mesa_debug(ctx
, "glGetPolygonStipple\n");
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");
247 _mesa_pack_polygon_stipple(ctx
->PolygonStipple
, dest
, &ctx
->Pack
);
249 _mesa_unmap_pbo_dest(ctx
, &ctx
->Pack
);
254 _mesa_GetPolygonStipple( GLubyte
*dest
)
256 _mesa_GetnPolygonStippleARB(INT_MAX
, dest
);
261 _mesa_PolygonOffset( GLfloat factor
, GLfloat units
)
263 GET_CURRENT_CONTEXT(ctx
);
265 if (MESA_VERBOSE
&VERBOSE_API
)
266 _mesa_debug(ctx
, "glPolygonOffset %f %f\n", factor
, units
);
268 if (ctx
->Polygon
.OffsetFactor
== factor
&&
269 ctx
->Polygon
.OffsetUnits
== units
)
272 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
273 ctx
->Polygon
.OffsetFactor
= factor
;
274 ctx
->Polygon
.OffsetUnits
= units
;
276 if (ctx
->Driver
.PolygonOffset
)
277 ctx
->Driver
.PolygonOffset( ctx
, factor
, units
);
282 _mesa_PolygonOffsetEXT( GLfloat factor
, GLfloat bias
)
284 GET_CURRENT_CONTEXT(ctx
);
285 /* XXX mult by DepthMaxF here??? */
286 _mesa_PolygonOffset(factor
, bias
* ctx
->DrawBuffer
->_DepthMaxF
);
291 /**********************************************************************/
292 /** \name Initialization */
296 * Initialize the context polygon state.
298 * \param ctx GL context.
300 * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
303 void _mesa_init_polygon( struct gl_context
* ctx
)
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
;
321 /* Polygon Stipple group */
322 memset( ctx
->PolygonStipple
, 0xff, 32*sizeof(GLuint
) );