projects / mesa.git / blob
? search:


2865e7e0d49fea87491b6d9a3f83ff2e532bfc93
[mesa.git] / src / mesa / main / rastpos.c
1 /* $Id: rastpos.c,v 1.17 2000/11/27 18:22:13 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 3.5
6 *
7 * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26
27
28 #ifdef PC_HEADER
29 #include "all.h"
30 #else
31 #include "glheader.h"
32 #include "clip.h"
33 #include "colormac.h"
34 #include "context.h"
35 #include "feedback.h"
36 #include "light.h"
37 #include "macros.h"
38 #include "mmath.h"
39 #include "rastpos.h"
40 #include "state.h"
41 #include "simple_list.h"
42 #include "mtypes.h"
43
44 #include "math/m_matrix.h"
45 #include "math/m_xform.h"
46 #endif
47
48
49 /*
50 * Clip a point against the view volume.
51 * Input: v - vertex-vector describing the point to clip
52 * Return: 0 = outside view volume
53 * 1 = inside view volume
54 */
55 static GLuint gl_viewclip_point( const GLfloat v[] )
56 {
57 if ( v[0] > v[3] || v[0] < -v[3]
58 || v[1] > v[3] || v[1] < -v[3]
59 || v[2] > v[3] || v[2] < -v[3] ) {
60 return 0;
61 }
62 else {
63 return 1;
64 }
65 }
66
67 /*
68 * Clip a point against the user clipping planes.
69 * Input: v - vertex-vector describing the point to clip.
70 * Return: 0 = point was clipped
71 * 1 = point not clipped
72 */
73 static GLuint gl_userclip_point( GLcontext* ctx, const GLfloat v[] )
74 {
75 GLuint p;
76
77 for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
78 if (ctx->Transform.ClipEnabled[p]) {
79 GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0]
80 + v[1] * ctx->Transform._ClipUserPlane[p][1]
81 + v[2] * ctx->Transform._ClipUserPlane[p][2]
82 + v[3] * ctx->Transform._ClipUserPlane[p][3];
83 if (dot < 0.0F) {
84 return 0;
85 }
86 }
87 }
88
89 return 1;
90 }
91
92
93 /* This has been split off to allow the normal shade routines to
94 * get a little closer to the vertex buffer, and to use the
95 * GLvector objects directly.
96 */
97 static void gl_shade_rastpos( GLcontext *ctx,
98 GLfloat vertex[4],
99 GLfloat normal[3],
100 GLfloat Rcolor[4],
101 GLuint *index )
102 {
103 GLfloat (*base)[3] = ctx->Light._BaseColor;
104 const GLchan *sumA = ctx->Light._BaseAlpha;
105 struct gl_light *light;
106 GLfloat color[4];
107 GLfloat diffuse = 0, specular = 0;
108
109 COPY_3V(color, base[0]);
110 color[3] = CHAN_TO_FLOAT( sumA[0] );
111
112 foreach (light, &ctx->Light.EnabledList) {
113 GLfloat n_dot_h;
114 GLfloat attenuation = 1.0;
115 GLfloat VP[3];
116 GLfloat n_dot_VP;
117 GLfloat *h;
118 GLfloat contrib[3];
119 GLboolean normalized;
120
121 if (!(light->_Flags & LIGHT_POSITIONAL)) {
122 COPY_3V(VP, light->_VP_inf_norm);
123 attenuation = light->_VP_inf_spot_attenuation;
124 }
125 else {
126 GLfloat d;
127
128 SUB_3V(VP, light->_Position, vertex);
129 d = LEN_3FV( VP );
130
131 if ( d > 1e-6) {
132 GLfloat invd = 1.0F / d;
133 SELF_SCALE_SCALAR_3V(VP, invd);
134 }
135 attenuation = 1.0F / (light->ConstantAttenuation + d *
136 (light->LinearAttenuation + d *
137 light->QuadraticAttenuation));
138
139 if (light->_Flags & LIGHT_SPOT)
140 {
141 GLfloat PV_dot_dir = - DOT3(VP, light->_NormDirection);
142
143 if (PV_dot_dir<light->_CosCutoff) {
144 continue;
145 }
146 else
147 {
148 double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
149 int k = (int) x;
150 GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0]
151 + (x-k)*light->_SpotExpTable[k][1]);
152 attenuation *= spot;
153 }
154 }
155 }
156
157 if (attenuation < 1e-3)
158 continue;
159
160 n_dot_VP = DOT3( normal, VP );
161
162 if (n_dot_VP < 0.0F) {
163 ACC_SCALE_SCALAR_3V(color, attenuation, light->_MatAmbient[0]);
164 continue;
165 }
166
167 COPY_3V(contrib, light->_MatAmbient[0]);
168 ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[0]);
169 diffuse += n_dot_VP * light->_dli * attenuation;
170
171 {
172 if (ctx->Light.Model.LocalViewer) {
173 GLfloat v[3];
174 COPY_3V(v, vertex);
175 NORMALIZE_3FV(v);
176 SUB_3V(VP, VP, v);
177 h = VP;
178 normalized = 0;
179 }
180 else if (light->_Flags & LIGHT_POSITIONAL) {
181 h = VP;
182 ACC_3V(h, ctx->_EyeZDir);
183 normalized = 0;
184 }
185 else {
186 h = light->_h_inf_norm;
187 normalized = 1;
188 }
189
190 n_dot_h = DOT3(normal, h);
191
192 if (n_dot_h > 0.0F) {
193 struct gl_material *mat = &ctx->Light.Material[0];
194 GLfloat spec_coef;
195 GLfloat shininess = mat->Shininess;
196
197 if (!normalized) {
198 n_dot_h *= n_dot_h;
199 n_dot_h /= LEN_SQUARED_3FV( h );
200 shininess *= .5;
201 }
202
203 GET_SHINE_TAB_ENTRY( ctx->_ShineTable[0], n_dot_h, spec_coef );
204
205 if (spec_coef > 1.0e-10) {
206 ACC_SCALE_SCALAR_3V( contrib, spec_coef,
207 light->_MatSpecular[0]);
208 specular += spec_coef * light->_sli * attenuation;
209 }
210 }
211 }
212
213 ACC_SCALE_SCALAR_3V( color, attenuation, contrib );
214 }
215
216 if (ctx->Visual.RGBAflag) {
217 Rcolor[0] = CLAMP(color[0], 0.0F, 1.0F);
218 Rcolor[1] = CLAMP(color[1], 0.0F, 1.0F);
219 Rcolor[2] = CLAMP(color[2], 0.0F, 1.0F);
220 Rcolor[3] = CLAMP(color[3], 0.0F, 1.0F);
221 }
222 else {
223 struct gl_material *mat = &ctx->Light.Material[0];
224 GLfloat d_a = mat->DiffuseIndex - mat->AmbientIndex;
225 GLfloat s_a = mat->SpecularIndex - mat->AmbientIndex;
226 GLfloat ind = mat->AmbientIndex
227 + diffuse * (1.0F-specular) * d_a
228 + specular * s_a;
229 if (ind > mat->SpecularIndex) {
230 ind = mat->SpecularIndex;
231 }
232 *index = (GLuint) (GLint) ind;
233 }
234
235 }
236
237 /*
238 * Caller: context->API.RasterPos4f
239 */
240 static void raster_pos4f( GLcontext *ctx,
241 GLfloat x, GLfloat y, GLfloat z, GLfloat w )
242 {
243 GLfloat v[4], eye[4], clip[4], ndc[3], d;
244
245 /* KW: Added this test, which is in the spec. We can't do this
246 * inside begin/end any more because the ctx->Current values
247 * aren't uptodate during that period.
248 */
249 FLUSH_TNL_RETURN(ctx, (FLUSH_INSIDE_BEGIN_END|
250 FLUSH_STORED_VERTICES|
251 FLUSH_UPDATE_CURRENT), "raster_pos4f");
252
253 if (ctx->NewState)
254 gl_update_state( ctx );
255
256 ASSIGN_4V( v, x, y, z, w );
257 TRANSFORM_POINT( eye, ctx->ModelView.m, v );
258
259 /* raster color */
260 if (ctx->Light.Enabled)
261 {
262 GLfloat *norm, eyenorm[3];
263 GLfloat *objnorm = ctx->Current.Normal;
264
265 if (ctx->_NeedEyeCoords) {
266 GLfloat *inv = ctx->ModelView.inv;
267 TRANSFORM_NORMAL( eyenorm, objnorm, inv );
268 norm = eyenorm;
269 } else {
270 norm = objnorm;
271 }
272
273 gl_shade_rastpos( ctx, v, norm,
274 ctx->Current.RasterColor,
275 &ctx->Current.RasterIndex );
276
277 }
278 else {
279 /* use current color or index */
280 if (ctx->Visual.RGBAflag) {
281 ctx->Current.RasterColor[0] = CHAN_TO_FLOAT(ctx->Current.Color[0]);
282 ctx->Current.RasterColor[1] = CHAN_TO_FLOAT(ctx->Current.Color[1]);
283 ctx->Current.RasterColor[2] = CHAN_TO_FLOAT(ctx->Current.Color[2]);
284 ctx->Current.RasterColor[3] = CHAN_TO_FLOAT(ctx->Current.Color[3]);
285 }
286 else {
287 ctx->Current.RasterIndex = ctx->Current.Index;
288 }
289 }
290
291 /* compute raster distance */
292 ctx->Current.RasterDistance = (GLfloat)
293 GL_SQRT( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
294
295 /* apply projection matrix: clip = Proj * eye */
296 TRANSFORM_POINT( clip, ctx->ProjectionMatrix.m, eye );
297
298 /* clip to view volume */
299 if (gl_viewclip_point( clip )==0) {
300 ctx->Current.RasterPosValid = GL_FALSE;
301 return;
302 }
303
304 /* clip to user clipping planes */
305 if ( ctx->Transform._AnyClip &&
306 gl_userclip_point(ctx, clip) == 0)
307 {
308 ctx->Current.RasterPosValid = GL_FALSE;
309 return;
310 }
311
312 /* ndc = clip / W */
313 ASSERT( clip[3]!=0.0 );
314 d = 1.0F / clip[3];
315 ndc[0] = clip[0] * d;
316 ndc[1] = clip[1] * d;
317 ndc[2] = clip[2] * d;
318
319 ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX] +
320 ctx->Viewport._WindowMap.m[MAT_TX]);
321 ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY] +
322 ctx->Viewport._WindowMap.m[MAT_TY]);
323 ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ] +
324 ctx->Viewport._WindowMap.m[MAT_TZ]) / ctx->Visual.DepthMaxF;
325 ctx->Current.RasterPos[3] = clip[3];
326 ctx->Current.RasterPosValid = GL_TRUE;
327
328 /* FOG??? */
329
330 {
331 GLuint texSet;
332 for (texSet = 0; texSet < ctx->Const.MaxTextureUnits; texSet++) {
333 COPY_4FV( ctx->Current.RasterMultiTexCoord[texSet],
334 ctx->Current.Texcoord[texSet] );
335 }
336 }
337
338 if (ctx->RenderMode==GL_SELECT) {
339 gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
340 }
341
342 }
343
344
345
346 void
347 _mesa_RasterPos2d(GLdouble x, GLdouble y)
348 {
349 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
350 }
351
352 void
353 _mesa_RasterPos2f(GLfloat x, GLfloat y)
354 {
355 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
356 }
357
358 void
359 _mesa_RasterPos2i(GLint x, GLint y)
360 {
361 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
362 }
363
364 void
365 _mesa_RasterPos2s(GLshort x, GLshort y)
366 {
367 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
368 }
369
370 void
371 _mesa_RasterPos3d(GLdouble x, GLdouble y, GLdouble z)
372 {
373 _mesa_RasterPos4f(x, y, z, 1.0F);
374 }
375
376 void
377 _mesa_RasterPos3f(GLfloat x, GLfloat y, GLfloat z)
378 {
379 _mesa_RasterPos4f(x, y, z, 1.0F);
380 }
381
382 void
383 _mesa_RasterPos3i(GLint x, GLint y, GLint z)
384 {
385 _mesa_RasterPos4f(x, y, z, 1.0F);
386 }
387
388 void
389 _mesa_RasterPos3s(GLshort x, GLshort y, GLshort z)
390 {
391 _mesa_RasterPos4f(x, y, z, 1.0F);
392 }
393
394 void
395 _mesa_RasterPos4d(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
396 {
397 _mesa_RasterPos4f(x, y, z, w);
398 }
399
400 void
401 _mesa_RasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
402 {
403 GET_CURRENT_CONTEXT(ctx);
404 raster_pos4f(ctx, x, y, z, w);
405 }
406
407 void
408 _mesa_RasterPos4i(GLint x, GLint y, GLint z, GLint w)
409 {
410 _mesa_RasterPos4f(x, y, z, w);
411 }
412
413 void
414 _mesa_RasterPos4s(GLshort x, GLshort y, GLshort z, GLshort w)
415 {
416 _mesa_RasterPos4f(x, y, z, w);
417 }
418
419 void
420 _mesa_RasterPos2dv(const GLdouble *v)
421 {
422 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
423 }
424
425 void
426 _mesa_RasterPos2fv(const GLfloat *v)
427 {
428 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
429 }
430
431 void
432 _mesa_RasterPos2iv(const GLint *v)
433 {
434 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
435 }
436
437 void
438 _mesa_RasterPos2sv(const GLshort *v)
439 {
440 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
441 }
442
443 void
444 _mesa_RasterPos3dv(const GLdouble *v)
445 {
446 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
447 }
448
449 void
450 _mesa_RasterPos3fv(const GLfloat *v)
451 {
452 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
453 }
454
455 void
456 _mesa_RasterPos3iv(const GLint *v)
457 {
458 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
459 }
460
461 void
462 _mesa_RasterPos3sv(const GLshort *v)
463 {
464 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
465 }
466
467 void
468 _mesa_RasterPos4dv(const GLdouble *v)
469 {
470 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
471 }
472
473 void
474 _mesa_RasterPos4fv(const GLfloat *v)
475 {
476 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
477 }
478
479 void
480 _mesa_RasterPos4iv(const GLint *v)
481 {
482 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
483 }
484
485 void
486 _mesa_RasterPos4sv(const GLshort *v)
487 {
488 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
489 }