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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
26 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
27 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
43 * Specify whether to cull front- or back-facing facets.
45 * \param mode culling mode.
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.
54 _mesa_CullFace( GLenum mode
)
56 GET_CURRENT_CONTEXT(ctx
);
58 if (MESA_VERBOSE
&VERBOSE_API
)
59 _mesa_debug(ctx
, "glCullFace %s\n", _mesa_lookup_enum_by_nr(mode
));
61 if (mode
!=GL_FRONT
&& mode
!=GL_BACK
&& mode
!=GL_FRONT_AND_BACK
) {
62 _mesa_error( ctx
, GL_INVALID_ENUM
, "glCullFace" );
66 if (ctx
->Polygon
.CullFaceMode
== mode
)
69 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
70 ctx
->Polygon
.CullFaceMode
= mode
;
72 if (ctx
->Driver
.CullFace
)
73 ctx
->Driver
.CullFace( ctx
, mode
);
78 * Define front- and back-facing
80 * \param mode orientation of front-facing polygons.
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.
89 _mesa_FrontFace( GLenum mode
)
91 GET_CURRENT_CONTEXT(ctx
);
93 if (MESA_VERBOSE
&VERBOSE_API
)
94 _mesa_debug(ctx
, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode
));
96 if (mode
!=GL_CW
&& mode
!=GL_CCW
) {
97 _mesa_error( ctx
, GL_INVALID_ENUM
, "glFrontFace" );
101 if (ctx
->Polygon
.FrontFace
== mode
)
104 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
105 ctx
->Polygon
.FrontFace
= mode
;
107 ctx
->Polygon
._FrontBit
= (GLboolean
) (mode
== GL_CW
);
109 if (ctx
->Driver
.FrontFace
)
110 ctx
->Driver
.FrontFace( ctx
, mode
);
115 * Set the polygon rasterization mode.
117 * \param face the polygons which \p mode applies to.
118 * \param mode how polygons should be rasterized.
120 * \sa glPolygonMode().
122 * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
123 * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
124 * driver via the dd_function_table::PolygonMode callback.
127 _mesa_PolygonMode( GLenum face
, GLenum mode
)
129 GET_CURRENT_CONTEXT(ctx
);
131 if (MESA_VERBOSE
&VERBOSE_API
)
132 _mesa_debug(ctx
, "glPolygonMode %s %s\n",
133 _mesa_lookup_enum_by_nr(face
),
134 _mesa_lookup_enum_by_nr(mode
));
136 if (mode
!=GL_POINT
&& mode
!=GL_LINE
&& mode
!=GL_FILL
) {
137 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(mode)" );
143 if (ctx
->API
== API_OPENGL_CORE
) {
144 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(face)" );
147 if (ctx
->Polygon
.FrontMode
== mode
)
149 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
150 ctx
->Polygon
.FrontMode
= mode
;
152 case GL_FRONT_AND_BACK
:
153 if (ctx
->Polygon
.FrontMode
== mode
&&
154 ctx
->Polygon
.BackMode
== mode
)
156 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
157 ctx
->Polygon
.FrontMode
= mode
;
158 ctx
->Polygon
.BackMode
= mode
;
161 if (ctx
->API
== API_OPENGL_CORE
) {
162 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(face)" );
165 if (ctx
->Polygon
.BackMode
== mode
)
167 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
168 ctx
->Polygon
.BackMode
= mode
;
171 _mesa_error( ctx
, GL_INVALID_ENUM
, "glPolygonMode(face)" );
175 if (ctx
->Polygon
.FrontMode
== GL_FILL
&& ctx
->Polygon
.BackMode
== GL_FILL
)
176 ctx
->_TriangleCaps
&= ~DD_TRI_UNFILLED
;
178 ctx
->_TriangleCaps
|= DD_TRI_UNFILLED
;
180 if (ctx
->Driver
.PolygonMode
)
181 ctx
->Driver
.PolygonMode(ctx
, face
, mode
);
186 * This routine updates the ctx->Polygon.Stipple state.
187 * If we're getting the stipple data from a PBO, we map the buffer
188 * in order to access the data.
189 * In any case, we obey the current pixel unpacking parameters when fetching
192 * In the future, this routine should be used as a fallback, called via
193 * ctx->Driver.PolygonStipple(). We'll have to update all the DRI drivers
197 _mesa_polygon_stipple(struct gl_context
*ctx
, const GLubyte
*pattern
)
199 pattern
= _mesa_map_validate_pbo_source(ctx
, 2,
200 &ctx
->Unpack
, 32, 32, 1,
201 GL_COLOR_INDEX
, GL_BITMAP
,
207 _mesa_unpack_polygon_stipple(pattern
, ctx
->PolygonStipple
, &ctx
->Unpack
);
209 _mesa_unmap_pbo_source(ctx
, &ctx
->Unpack
);
214 * Called by glPolygonStipple.
217 _mesa_PolygonStipple( const GLubyte
*pattern
)
219 GET_CURRENT_CONTEXT(ctx
);
221 if (MESA_VERBOSE
&VERBOSE_API
)
222 _mesa_debug(ctx
, "glPolygonStipple\n");
224 FLUSH_VERTICES(ctx
, _NEW_POLYGONSTIPPLE
);
226 _mesa_polygon_stipple(ctx
, pattern
);
228 if (ctx
->Driver
.PolygonStipple
)
229 ctx
->Driver
.PolygonStipple(ctx
, pattern
);
234 * Called by glPolygonStipple.
237 _mesa_GetnPolygonStippleARB( GLsizei bufSize
, GLubyte
*dest
)
239 GET_CURRENT_CONTEXT(ctx
);
241 if (MESA_VERBOSE
&VERBOSE_API
)
242 _mesa_debug(ctx
, "glGetPolygonStipple\n");
244 dest
= _mesa_map_validate_pbo_dest(ctx
, 2,
245 &ctx
->Pack
, 32, 32, 1,
246 GL_COLOR_INDEX
, GL_BITMAP
,
247 bufSize
, dest
, "glGetPolygonStipple");
251 _mesa_pack_polygon_stipple(ctx
->PolygonStipple
, dest
, &ctx
->Pack
);
253 _mesa_unmap_pbo_dest(ctx
, &ctx
->Pack
);
258 _mesa_GetPolygonStipple( GLubyte
*dest
)
260 _mesa_GetnPolygonStippleARB(INT_MAX
, dest
);
265 _mesa_PolygonOffset( GLfloat factor
, GLfloat units
)
267 GET_CURRENT_CONTEXT(ctx
);
269 if (MESA_VERBOSE
&VERBOSE_API
)
270 _mesa_debug(ctx
, "glPolygonOffset %f %f\n", factor
, units
);
272 if (ctx
->Polygon
.OffsetFactor
== factor
&&
273 ctx
->Polygon
.OffsetUnits
== units
)
276 FLUSH_VERTICES(ctx
, _NEW_POLYGON
);
277 ctx
->Polygon
.OffsetFactor
= factor
;
278 ctx
->Polygon
.OffsetUnits
= units
;
280 if (ctx
->Driver
.PolygonOffset
)
281 ctx
->Driver
.PolygonOffset( ctx
, factor
, units
);
286 _mesa_PolygonOffsetEXT( GLfloat factor
, GLfloat bias
)
288 GET_CURRENT_CONTEXT(ctx
);
289 /* XXX mult by DepthMaxF here??? */
290 _mesa_PolygonOffset(factor
, bias
* ctx
->DrawBuffer
->_DepthMaxF
);
295 /**********************************************************************/
296 /** \name Initialization */
300 * Initialize the context polygon state.
302 * \param ctx GL context.
304 * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
307 void _mesa_init_polygon( struct gl_context
* ctx
)
310 ctx
->Polygon
.CullFlag
= GL_FALSE
;
311 ctx
->Polygon
.CullFaceMode
= GL_BACK
;
312 ctx
->Polygon
.FrontFace
= GL_CCW
;
313 ctx
->Polygon
._FrontBit
= 0;
314 ctx
->Polygon
.FrontMode
= GL_FILL
;
315 ctx
->Polygon
.BackMode
= GL_FILL
;
316 ctx
->Polygon
.SmoothFlag
= GL_FALSE
;
317 ctx
->Polygon
.StippleFlag
= GL_FALSE
;
318 ctx
->Polygon
.OffsetFactor
= 0.0F
;
319 ctx
->Polygon
.OffsetUnits
= 0.0F
;
320 ctx
->Polygon
.OffsetPoint
= GL_FALSE
;
321 ctx
->Polygon
.OffsetLine
= GL_FALSE
;
322 ctx
->Polygon
.OffsetFill
= GL_FALSE
;
325 /* Polygon Stipple group */
326 memset( ctx
->PolygonStipple
, 0xff, 32*sizeof(GLuint
) );