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
_mesa_CullFace(GLenum mode)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
_mesa_FrontFace(GLenum mode)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
_mesa_PolygonMode(GLenum face,GLenum mode)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 &&
152 ctx->Polygon.BackMode == mode)
153 return;
154 FLUSH_VERTICES(ctx, _NEW_POLYGON);
155 ctx->Polygon.FrontMode = mode;
156 ctx->Polygon.BackMode = mode;
157 break;
158 case GL_BACK:
159 if (ctx->API == API_OPENGL_CORE) {
160 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
161 return;
162 }
163 if (ctx->Polygon.BackMode == mode)
164 return;
165 FLUSH_VERTICES(ctx, _NEW_POLYGON);
166 ctx->Polygon.BackMode = mode;
167 break;
168 default:
169 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
170 return;
171 }
172
173 if (ctx->Driver.PolygonMode)
174 ctx->Driver.PolygonMode(ctx, face, mode);
175 }
176
177
178 /**
179 * Called by glPolygonStipple.
180 */
181 void GLAPIENTRY
_mesa_PolygonStipple(const GLubyte * pattern)182 _mesa_PolygonStipple(const GLubyte *pattern)
183 {
184 GET_CURRENT_CONTEXT(ctx);
185
186 if (MESA_VERBOSE & VERBOSE_API)
187 _mesa_debug(ctx, "glPolygonStipple\n");
188
189 FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
190
191 pattern = _mesa_map_validate_pbo_source(ctx, 2,
192 &ctx->Unpack, 32, 32, 1,
193 GL_COLOR_INDEX, GL_BITMAP,
194 INT_MAX, pattern,
195 "glPolygonStipple");
196 if (!pattern)
197 return;
198
199 _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
200
201 _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
202
203 if (ctx->Driver.PolygonStipple)
204 ctx->Driver.PolygonStipple(ctx, pattern);
205 }
206
207
208 /**
209 * Called by glPolygonStipple.
210 */
211 void GLAPIENTRY
_mesa_GetnPolygonStippleARB(GLsizei bufSize,GLubyte * dest)212 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
213 {
214 GET_CURRENT_CONTEXT(ctx);
215
216 if (MESA_VERBOSE&VERBOSE_API)
217 _mesa_debug(ctx, "glGetPolygonStipple\n");
218
219 dest = _mesa_map_validate_pbo_dest(ctx, 2,
220 &ctx->Pack, 32, 32, 1,
221 GL_COLOR_INDEX, GL_BITMAP,
222 bufSize, dest, "glGetPolygonStipple");
223 if (!dest)
224 return;
225
226 _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
227
228 _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
229 }
230
231
232 void GLAPIENTRY
_mesa_GetPolygonStipple(GLubyte * dest)233 _mesa_GetPolygonStipple( GLubyte *dest )
234 {
235 _mesa_GetnPolygonStippleARB(INT_MAX, dest);
236 }
237
238 void
_mesa_polygon_offset_clamp(struct gl_context * ctx,GLfloat factor,GLfloat units,GLfloat clamp)239 _mesa_polygon_offset_clamp(struct gl_context *ctx,
240 GLfloat factor, GLfloat units, GLfloat clamp)
241 {
242 if (ctx->Polygon.OffsetFactor == factor &&
243 ctx->Polygon.OffsetUnits == units &&
244 ctx->Polygon.OffsetClamp == clamp)
245 return;
246
247 FLUSH_VERTICES(ctx, _NEW_POLYGON);
248 ctx->Polygon.OffsetFactor = factor;
249 ctx->Polygon.OffsetUnits = units;
250 ctx->Polygon.OffsetClamp = clamp;
251
252 if (ctx->Driver.PolygonOffset)
253 ctx->Driver.PolygonOffset( ctx, factor, units, clamp );
254 }
255
256 void GLAPIENTRY
_mesa_PolygonOffset(GLfloat factor,GLfloat units)257 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
258 {
259 GET_CURRENT_CONTEXT(ctx);
260
261 if (MESA_VERBOSE&VERBOSE_API)
262 _mesa_debug(ctx, "glPolygonOffset %f %f\n", factor, units);
263
264 _mesa_polygon_offset_clamp(ctx, factor, units, 0.0);
265 }
266
267
268 void GLAPIENTRY
_mesa_PolygonOffsetEXT(GLfloat factor,GLfloat bias)269 _mesa_PolygonOffsetEXT( GLfloat factor, GLfloat bias )
270 {
271 GET_CURRENT_CONTEXT(ctx);
272 /* XXX mult by DepthMaxF here??? */
273 _mesa_PolygonOffset(factor, bias * ctx->DrawBuffer->_DepthMaxF );
274 }
275
276 void GLAPIENTRY
_mesa_PolygonOffsetClampEXT(GLfloat factor,GLfloat units,GLfloat clamp)277 _mesa_PolygonOffsetClampEXT( GLfloat factor, GLfloat units, GLfloat clamp )
278 {
279 GET_CURRENT_CONTEXT(ctx);
280
281 if (!ctx->Extensions.EXT_polygon_offset_clamp) {
282 _mesa_error(ctx, GL_INVALID_OPERATION,
283 "unsupported function (glPolygonOffsetClampEXT) called");
284 return;
285 }
286
287 if (MESA_VERBOSE&VERBOSE_API)
288 _mesa_debug(ctx, "glPolygonOffsetClampEXT %f %f %f\n", factor, units, clamp);
289
290 _mesa_polygon_offset_clamp(ctx, factor, units, clamp);
291 }
292
293
294
295 /**********************************************************************/
296 /** \name Initialization */
297 /*@{*/
298
299 /**
300 * Initialize the context polygon state.
301 *
302 * \param ctx GL context.
303 *
304 * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
305 * attribute groups.
306 */
_mesa_init_polygon(struct gl_context * ctx)307 void _mesa_init_polygon( struct gl_context * ctx )
308 {
309 /* Polygon group */
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.OffsetClamp = 0.0F;
321 ctx->Polygon.OffsetPoint = GL_FALSE;
322 ctx->Polygon.OffsetLine = GL_FALSE;
323 ctx->Polygon.OffsetFill = GL_FALSE;
324
325
326 /* Polygon Stipple group */
327 memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );
328 }
329
330 /*@}*/
331