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 * 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.
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
_mesa_CullFace(GLenum mode)54 _mesa_CullFace( GLenum mode )
55 {
56 GET_CURRENT_CONTEXT(ctx);
57 ASSERT_OUTSIDE_BEGIN_END(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
_mesa_FrontFace(GLenum mode)90 _mesa_FrontFace( GLenum mode )
91 {
92 GET_CURRENT_CONTEXT(ctx);
93 ASSERT_OUTSIDE_BEGIN_END(ctx);
94
95 if (MESA_VERBOSE&VERBOSE_API)
96 _mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));
97
98 if (mode!=GL_CW && mode!=GL_CCW) {
99 _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
100 return;
101 }
102
103 if (ctx->Polygon.FrontFace == mode)
104 return;
105
106 FLUSH_VERTICES(ctx, _NEW_POLYGON);
107 ctx->Polygon.FrontFace = mode;
108
109 ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);
110
111 if (ctx->Driver.FrontFace)
112 ctx->Driver.FrontFace( ctx, mode );
113 }
114
115
116 /**
117 * Set the polygon rasterization mode.
118 *
119 * \param face the polygons which \p mode applies to.
120 * \param mode how polygons should be rasterized.
121 *
122 * \sa glPolygonMode().
123 *
124 * Verifies the parameters and updates gl_polygon_attrib::FrontMode and
125 * gl_polygon_attrib::BackMode. On change flushes the vertices and notifies the
126 * driver via the dd_function_table::PolygonMode callback.
127 */
128 void GLAPIENTRY
_mesa_PolygonMode(GLenum face,GLenum mode)129 _mesa_PolygonMode( GLenum face, GLenum mode )
130 {
131 GET_CURRENT_CONTEXT(ctx);
132 ASSERT_OUTSIDE_BEGIN_END(ctx);
133
134 if (MESA_VERBOSE&VERBOSE_API)
135 _mesa_debug(ctx, "glPolygonMode %s %s\n",
136 _mesa_lookup_enum_by_nr(face),
137 _mesa_lookup_enum_by_nr(mode));
138
139 if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
140 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
141 return;
142 }
143
144 switch (face) {
145 case GL_FRONT:
146 if (ctx->API == API_OPENGL_CORE) {
147 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
148 return;
149 }
150 if (ctx->Polygon.FrontMode == mode)
151 return;
152 FLUSH_VERTICES(ctx, _NEW_POLYGON);
153 ctx->Polygon.FrontMode = mode;
154 break;
155 case GL_FRONT_AND_BACK:
156 if (ctx->Polygon.FrontMode == mode &&
157 ctx->Polygon.BackMode == mode)
158 return;
159 FLUSH_VERTICES(ctx, _NEW_POLYGON);
160 ctx->Polygon.FrontMode = mode;
161 ctx->Polygon.BackMode = mode;
162 break;
163 case GL_BACK:
164 if (ctx->API == API_OPENGL_CORE) {
165 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
166 return;
167 }
168 if (ctx->Polygon.BackMode == mode)
169 return;
170 FLUSH_VERTICES(ctx, _NEW_POLYGON);
171 ctx->Polygon.BackMode = mode;
172 break;
173 default:
174 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
175 return;
176 }
177
178 if (ctx->Polygon.FrontMode == GL_FILL && ctx->Polygon.BackMode == GL_FILL)
179 ctx->_TriangleCaps &= ~DD_TRI_UNFILLED;
180 else
181 ctx->_TriangleCaps |= DD_TRI_UNFILLED;
182
183 if (ctx->Driver.PolygonMode)
184 ctx->Driver.PolygonMode(ctx, face, mode);
185 }
186
187 #if _HAVE_FULL_GL
188
189
190 /**
191 * This routine updates the ctx->Polygon.Stipple state.
192 * If we're getting the stipple data from a PBO, we map the buffer
193 * in order to access the data.
194 * In any case, we obey the current pixel unpacking parameters when fetching
195 * the stipple data.
196 *
197 * In the future, this routine should be used as a fallback, called via
198 * ctx->Driver.PolygonStipple(). We'll have to update all the DRI drivers
199 * too.
200 */
201 void
_mesa_polygon_stipple(struct gl_context * ctx,const GLubyte * pattern)202 _mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern)
203 {
204 pattern = _mesa_map_validate_pbo_source(ctx, 2,
205 &ctx->Unpack, 32, 32, 1,
206 GL_COLOR_INDEX, GL_BITMAP,
207 INT_MAX, pattern,
208 "glPolygonStipple");
209 if (!pattern)
210 return;
211
212 _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
213
214 _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
215 }
216
217
218 /**
219 * Called by glPolygonStipple.
220 */
221 void GLAPIENTRY
_mesa_PolygonStipple(const GLubyte * pattern)222 _mesa_PolygonStipple( const GLubyte *pattern )
223 {
224 GET_CURRENT_CONTEXT(ctx);
225 ASSERT_OUTSIDE_BEGIN_END(ctx);
226
227 if (MESA_VERBOSE&VERBOSE_API)
228 _mesa_debug(ctx, "glPolygonStipple\n");
229
230 FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
231
232 _mesa_polygon_stipple(ctx, pattern);
233
234 if (ctx->Driver.PolygonStipple)
235 ctx->Driver.PolygonStipple(ctx, pattern);
236 }
237
238
239 /**
240 * Called by glPolygonStipple.
241 */
242 void GLAPIENTRY
_mesa_GetnPolygonStippleARB(GLsizei bufSize,GLubyte * dest)243 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
244 {
245 GET_CURRENT_CONTEXT(ctx);
246 ASSERT_OUTSIDE_BEGIN_END(ctx);
247
248 if (MESA_VERBOSE&VERBOSE_API)
249 _mesa_debug(ctx, "glGetPolygonStipple\n");
250
251 dest = _mesa_map_validate_pbo_dest(ctx, 2,
252 &ctx->Pack, 32, 32, 1,
253 GL_COLOR_INDEX, GL_BITMAP,
254 bufSize, dest, "glGetPolygonStipple");
255 if (!dest)
256 return;
257
258 _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
259
260 _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
261 }
262
263
264 void GLAPIENTRY
_mesa_GetPolygonStipple(GLubyte * dest)265 _mesa_GetPolygonStipple( GLubyte *dest )
266 {
267 _mesa_GetnPolygonStippleARB(INT_MAX, dest);
268 }
269
270
271 void GLAPIENTRY
_mesa_PolygonOffset(GLfloat factor,GLfloat units)272 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
273 {
274 GET_CURRENT_CONTEXT(ctx);
275 ASSERT_OUTSIDE_BEGIN_END(ctx);
276
277 if (MESA_VERBOSE&VERBOSE_API)
278 _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
279
280 if (ctx->Polygon.OffsetFactor == factor &&
281 ctx->Polygon.OffsetUnits == units)
282 return;
283
284 FLUSH_VERTICES(ctx, _NEW_POLYGON);
285 ctx->Polygon.OffsetFactor = factor;
286 ctx->Polygon.OffsetUnits = units;
287
288 if (ctx->Driver.PolygonOffset)
289 ctx->Driver.PolygonOffset( ctx, factor, units );
290 }
291
292
293 void GLAPIENTRY
_mesa_PolygonOffsetEXT(GLfloat factor,GLfloat bias)294 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
295 {
296 GET_CURRENT_CONTEXT(ctx);
297 /* XXX mult by DepthMaxF here??? */
298 _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
299 }
300
301 #endif
302
303
304 /**********************************************************************/
305 /** \name Initialization */
306 /*@{*/
307
308 /**
309 * Initialize the context polygon state.
310 *
311 * \param ctx GL context.
312 *
313 * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
314 * attribute groups.
315 */
_mesa_init_polygon(struct gl_context * ctx)316 void _mesa_init_polygon( struct gl_context * ctx )
317 {
318 /* Polygon group */
319 ctx->Polygon.CullFlag = GL_FALSE;
320 ctx->Polygon.CullFaceMode = GL_BACK;
321 ctx->Polygon.FrontFace = GL_CCW;
322 ctx->Polygon._FrontBit = 0;
323 ctx->Polygon.FrontMode = GL_FILL;
324 ctx->Polygon.BackMode = GL_FILL;
325 ctx->Polygon.SmoothFlag = GL_FALSE;
326 ctx->Polygon.StippleFlag = GL_FALSE;
327 ctx->Polygon.OffsetFactor = 0.0F;
328 ctx->Polygon.OffsetUnits = 0.0F;
329 ctx->Polygon.OffsetPoint = GL_FALSE;
330 ctx->Polygon.OffsetLine = GL_FALSE;
331 ctx->Polygon.OffsetFill = GL_FALSE;
332
333
334 /* Polygon Stipple group */
335 memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
336 }
337
338 /*@}*/
339