7 * Mesa 3-D graphics library
10 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
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13 * copy of this software and associated documentation files (the "Software"),
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24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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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);
57 ASSERT_OUTSIDE_BEGIN_END(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);
93 ASSERT_OUTSIDE_BEGIN_END(ctx);
95 if (MESA_VERBOSE&VERBOSE_API)
96 _mesa_debug(ctx, "glFrontFace %s\n", _mesa_lookup_enum_by_nr(mode));
98 if (mode!=GL_CW && mode!=GL_CCW) {
99 _mesa_error( ctx, GL_INVALID_ENUM, "glFrontFace" );
103 if (ctx->Polygon.FrontFace == mode)
106 FLUSH_VERTICES(ctx, _NEW_POLYGON);
107 ctx->Polygon.FrontFace = mode;
109 ctx->Polygon._FrontBit = (GLboolean) (mode == GL_CW);
111 if (ctx->Driver.FrontFace)
112 ctx->Driver.FrontFace( ctx, mode );
117 * Set the polygon rasterization mode.
119 * \param face the polygons which \p mode applies to.
120 * \param mode how polygons should be rasterized.
122 * \sa glPolygonMode().
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.
129 _mesa_PolygonMode( GLenum face, GLenum mode )
131 GET_CURRENT_CONTEXT(ctx);
132 ASSERT_OUTSIDE_BEGIN_END(ctx);
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));
139 if (mode!=GL_POINT && mode!=GL_LINE && mode!=GL_FILL) {
140 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(mode)" );
146 if (ctx->Polygon.FrontMode == mode)
148 FLUSH_VERTICES(ctx, _NEW_POLYGON);
149 ctx->Polygon.FrontMode = mode;
151 case GL_FRONT_AND_BACK:
152 if (ctx->Polygon.FrontMode == mode &&
153 ctx->Polygon.BackMode == mode)
155 FLUSH_VERTICES(ctx, _NEW_POLYGON);
156 ctx->Polygon.FrontMode = mode;
157 ctx->Polygon.BackMode = mode;
160 if (ctx->Polygon.BackMode == mode)
162 FLUSH_VERTICES(ctx, _NEW_POLYGON);
163 ctx->Polygon.BackMode = mode;
166 _mesa_error( ctx, GL_INVALID_ENUM, "glPolygonMode(face)" );
170 if (ctx->Polygon.FrontMode == GL_FILL && ctx->Polygon.BackMode == GL_FILL)
171 ctx->_TriangleCaps &= ~DD_TRI_UNFILLED;
173 ctx->_TriangleCaps |= DD_TRI_UNFILLED;
175 if (ctx->Driver.PolygonMode)
176 ctx->Driver.PolygonMode(ctx, face, mode);
183 * This routine updates the ctx->Polygon.Stipple state.
184 * If we're getting the stipple data from a PBO, we map the buffer
185 * in order to access the data.
186 * In any case, we obey the current pixel unpacking parameters when fetching
189 * In the future, this routine should be used as a fallback, called via
190 * ctx->Driver.PolygonStipple(). We'll have to update all the DRI drivers
194 _mesa_polygon_stipple(struct gl_context *ctx, const GLubyte *pattern)
196 pattern = _mesa_map_validate_pbo_source(ctx, 2,
197 &ctx->Unpack, 32, 32, 1,
198 GL_COLOR_INDEX, GL_BITMAP,
204 _mesa_unpack_polygon_stipple(pattern, ctx->PolygonStipple, &ctx->Unpack);
206 _mesa_unmap_pbo_source(ctx, &ctx->Unpack);
211 * Called by glPolygonStipple.
214 _mesa_PolygonStipple( const GLubyte *pattern )
216 GET_CURRENT_CONTEXT(ctx);
217 ASSERT_OUTSIDE_BEGIN_END(ctx);
219 if (MESA_VERBOSE&VERBOSE_API)
220 _mesa_debug(ctx, "glPolygonStipple\n");
222 FLUSH_VERTICES(ctx, _NEW_POLYGONSTIPPLE);
224 _mesa_polygon_stipple(ctx, pattern);
226 if (ctx->Driver.PolygonStipple)
227 ctx->Driver.PolygonStipple(ctx, pattern);
232 * Called by glPolygonStipple.
235 _mesa_GetnPolygonStippleARB( GLsizei bufSize, GLubyte *dest )
237 GET_CURRENT_CONTEXT(ctx);
238 ASSERT_OUTSIDE_BEGIN_END(ctx);
240 if (MESA_VERBOSE&VERBOSE_API)
241 _mesa_debug(ctx, "glGetPolygonStipple\n");
243 dest = _mesa_map_validate_pbo_dest(ctx, 2,
244 &ctx->Pack, 32, 32, 1,
245 GL_COLOR_INDEX, GL_BITMAP,
246 bufSize, dest, "glGetPolygonStipple");
250 _mesa_pack_polygon_stipple(ctx->PolygonStipple, dest, &ctx->Pack);
252 _mesa_unmap_pbo_dest(ctx, &ctx->Pack);
257 _mesa_GetPolygonStipple( GLubyte *dest )
259 _mesa_GetnPolygonStippleARB(INT_MAX, dest);
264 _mesa_PolygonOffset( GLfloat factor, GLfloat units )
266 GET_CURRENT_CONTEXT(ctx);
267 ASSERT_OUTSIDE_BEGIN_END(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 );
296 /**********************************************************************/
297 /** \name Initialization */
301 * Initialize the context polygon state.
303 * \param ctx GL context.
305 * Initializes __struct gl_contextRec::Polygon and __struct gl_contextRec::PolygonStipple
308 void _mesa_init_polygon( struct gl_context * ctx )
311 ctx->Polygon.CullFlag = GL_FALSE;
312 ctx->Polygon.CullFaceMode = GL_BACK;
313 ctx->Polygon.FrontFace = GL_CCW;
314 ctx->Polygon._FrontBit = 0;
315 ctx->Polygon.FrontMode = GL_FILL;
316 ctx->Polygon.BackMode = GL_FILL;
317 ctx->Polygon.SmoothFlag = GL_FALSE;
318 ctx->Polygon.StippleFlag = GL_FALSE;
319 ctx->Polygon.OffsetFactor = 0.0F;
320 ctx->Polygon.OffsetUnits = 0.0F;
321 ctx->Polygon.OffsetPoint = GL_FALSE;
322 ctx->Polygon.OffsetLine = GL_FALSE;
323 ctx->Polygon.OffsetFill = GL_FALSE;
326 /* Polygon Stipple group */
327 memset( ctx->PolygonStipple, 0xff, 32*sizeof(GLuint) );