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[mesa.git] / src / mesa / main / rastpos.c
1 /* $Id: rastpos.c,v 1.19 2001/01/03 15:56:41 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
56 viewclip_point( const GLfloat v[] )
57 {
58 if ( v[0] > v[3] || v[0] < -v[3]
59 || v[1] > v[3] || v[1] < -v[3]
60 || v[2] > v[3] || v[2] < -v[3] ) {
61 return 0;
62 }
63 else {
64 return 1;
65 }
66 }
67
68
69 /*
70 * Clip a point against the user clipping planes.
71 * Input: v - vertex-vector describing the point to clip.
72 * Return: 0 = point was clipped
73 * 1 = point not clipped
74 */
75 static GLuint
76 userclip_point( GLcontext* ctx, const GLfloat v[] )
77 {
78 GLuint p;
79
80 for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
81 if (ctx->Transform.ClipEnabled[p]) {
82 GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0]
83 + v[1] * ctx->Transform._ClipUserPlane[p][1]
84 + v[2] * ctx->Transform._ClipUserPlane[p][2]
85 + v[3] * ctx->Transform._ClipUserPlane[p][3];
86 if (dot < 0.0F) {
87 return 0;
88 }
89 }
90 }
91
92 return 1;
93 }
94
95
96 /* This has been split off to allow the normal shade routines to
97 * get a little closer to the vertex buffer, and to use the
98 * GLvector objects directly.
99 */
100 static void
101 shade_rastpos(GLcontext *ctx,
102 const GLfloat vertex[4],
103 const GLfloat normal[3],
104 GLfloat Rcolor[4],
105 GLuint *index)
106 {
107 GLfloat (*base)[3] = ctx->Light._BaseColor;
108 const GLchan *sumA = ctx->Light._BaseAlpha;
109 struct gl_light *light;
110 GLfloat color[4];
111 GLfloat diffuse = 0, specular = 0;
112
113 COPY_3V(color, base[0]);
114 color[3] = CHAN_TO_FLOAT( sumA[0] );
115
116 foreach (light, &ctx->Light.EnabledList) {
117 GLfloat n_dot_h;
118 GLfloat attenuation = 1.0;
119 GLfloat VP[3];
120 GLfloat n_dot_VP;
121 GLfloat *h;
122 GLfloat contrib[3];
123 GLboolean normalized;
124
125 if (!(light->_Flags & LIGHT_POSITIONAL)) {
126 COPY_3V(VP, light->_VP_inf_norm);
127 attenuation = light->_VP_inf_spot_attenuation;
128 }
129 else {
130 GLfloat d;
131
132 SUB_3V(VP, light->_Position, vertex);
133 d = LEN_3FV( VP );
134
135 if ( d > 1e-6) {
136 GLfloat invd = 1.0F / d;
137 SELF_SCALE_SCALAR_3V(VP, invd);
138 }
139 attenuation = 1.0F / (light->ConstantAttenuation + d *
140 (light->LinearAttenuation + d *
141 light->QuadraticAttenuation));
142
143 if (light->_Flags & LIGHT_SPOT) {
144 GLfloat PV_dot_dir = - DOT3(VP, light->_NormDirection);
145
146 if (PV_dot_dir<light->_CosCutoff) {
147 continue;
148 }
149 else {
150 double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
151 int k = (int) x;
152 GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0]
153 + (x-k)*light->_SpotExpTable[k][1]);
154 attenuation *= spot;
155 }
156 }
157 }
158
159 if (attenuation < 1e-3)
160 continue;
161
162 n_dot_VP = DOT3( normal, VP );
163
164 if (n_dot_VP < 0.0F) {
165 ACC_SCALE_SCALAR_3V(color, attenuation, light->_MatAmbient[0]);
166 continue;
167 }
168
169 COPY_3V(contrib, light->_MatAmbient[0]);
170 ACC_SCALE_SCALAR_3V(contrib, n_dot_VP, light->_MatDiffuse[0]);
171 diffuse += n_dot_VP * light->_dli * attenuation;
172
173 {
174 if (ctx->Light.Model.LocalViewer) {
175 GLfloat v[3];
176 COPY_3V(v, vertex);
177 NORMALIZE_3FV(v);
178 SUB_3V(VP, VP, v);
179 h = VP;
180 normalized = 0;
181 }
182 else if (light->_Flags & LIGHT_POSITIONAL) {
183 h = VP;
184 ACC_3V(h, ctx->_EyeZDir);
185 normalized = 0;
186 }
187 else {
188 h = light->_h_inf_norm;
189 normalized = 1;
190 }
191
192 n_dot_h = DOT3(normal, h);
193
194 if (n_dot_h > 0.0F) {
195 struct gl_material *mat = &ctx->Light.Material[0];
196 GLfloat spec_coef;
197 GLfloat shininess = mat->Shininess;
198
199 if (!normalized) {
200 n_dot_h *= n_dot_h;
201 n_dot_h /= LEN_SQUARED_3FV( h );
202 shininess *= .5;
203 }
204
205 GET_SHINE_TAB_ENTRY( ctx->_ShineTable[0], n_dot_h, spec_coef );
206
207 if (spec_coef > 1.0e-10) {
208 ACC_SCALE_SCALAR_3V( contrib, spec_coef,
209 light->_MatSpecular[0]);
210 specular += spec_coef * light->_sli * attenuation;
211 }
212 }
213 }
214
215 ACC_SCALE_SCALAR_3V( color, attenuation, contrib );
216 }
217
218 if (ctx->Visual.RGBAflag) {
219 Rcolor[0] = CLAMP(color[0], 0.0F, 1.0F);
220 Rcolor[1] = CLAMP(color[1], 0.0F, 1.0F);
221 Rcolor[2] = CLAMP(color[2], 0.0F, 1.0F);
222 Rcolor[3] = CLAMP(color[3], 0.0F, 1.0F);
223 }
224 else {
225 struct gl_material *mat = &ctx->Light.Material[0];
226 GLfloat d_a = mat->DiffuseIndex - mat->AmbientIndex;
227 GLfloat s_a = mat->SpecularIndex - mat->AmbientIndex;
228 GLfloat ind = mat->AmbientIndex
229 + diffuse * (1.0F-specular) * d_a
230 + specular * s_a;
231 if (ind > mat->SpecularIndex) {
232 ind = mat->SpecularIndex;
233 }
234 *index = (GLuint) (GLint) ind;
235 }
236
237 }
238
239 /*
240 * Caller: context->API.RasterPos4f
241 */
242 static void
243 raster_pos4f(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
244 {
245 GLfloat v[4], eye[4], clip[4], ndc[3], d;
246 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
247 FLUSH_CURRENT(ctx, 0);
248
249 if (ctx->NewState)
250 gl_update_state( ctx );
251
252 ASSIGN_4V( v, x, y, z, w );
253 TRANSFORM_POINT( eye, ctx->ModelView.m, v );
254
255 /* raster color */
256 if (ctx->Light.Enabled) {
257 GLfloat *norm, eyenorm[3];
258 GLfloat *objnorm = ctx->Current.Normal;
259
260 if (ctx->_NeedEyeCoords) {
261 GLfloat *inv = ctx->ModelView.inv;
262 TRANSFORM_NORMAL( eyenorm, objnorm, inv );
263 norm = eyenorm;
264 }
265 else {
266 norm = objnorm;
267 }
268
269 shade_rastpos( ctx, v, norm,
270 ctx->Current.RasterColor,
271 &ctx->Current.RasterIndex );
272
273 }
274 else {
275 /* use current color or index */
276 if (ctx->Visual.RGBAflag) {
277 ctx->Current.RasterColor[0] = CHAN_TO_FLOAT(ctx->Current.Color[0]);
278 ctx->Current.RasterColor[1] = CHAN_TO_FLOAT(ctx->Current.Color[1]);
279 ctx->Current.RasterColor[2] = CHAN_TO_FLOAT(ctx->Current.Color[2]);
280 ctx->Current.RasterColor[3] = CHAN_TO_FLOAT(ctx->Current.Color[3]);
281 }
282 else {
283 ctx->Current.RasterIndex = ctx->Current.Index;
284 }
285 }
286
287 /* compute raster distance */
288 ctx->Current.RasterDistance = (GLfloat)
289 GL_SQRT( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
290
291 /* apply projection matrix: clip = Proj * eye */
292 TRANSFORM_POINT( clip, ctx->ProjectionMatrix.m, eye );
293
294 /* clip to view volume */
295 if (viewclip_point( clip )==0) {
296 ctx->Current.RasterPosValid = GL_FALSE;
297 return;
298 }
299
300 /* clip to user clipping planes */
301 if (ctx->Transform._AnyClip &&
302 userclip_point(ctx, clip) == 0) {
303 ctx->Current.RasterPosValid = GL_FALSE;
304 return;
305 }
306
307 /* ndc = clip / W */
308 ASSERT( clip[3]!=0.0 );
309 d = 1.0F / clip[3];
310 ndc[0] = clip[0] * d;
311 ndc[1] = clip[1] * d;
312 ndc[2] = clip[2] * d;
313
314 ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX] +
315 ctx->Viewport._WindowMap.m[MAT_TX]);
316 ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY] +
317 ctx->Viewport._WindowMap.m[MAT_TY]);
318 ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ] +
319 ctx->Viewport._WindowMap.m[MAT_TZ]) / ctx->Visual.DepthMaxF;
320 ctx->Current.RasterPos[3] = clip[3];
321 ctx->Current.RasterPosValid = GL_TRUE;
322
323 /* FOG??? */
324
325 {
326 GLuint texSet;
327 for (texSet = 0; texSet < ctx->Const.MaxTextureUnits; texSet++) {
328 COPY_4FV( ctx->Current.RasterMultiTexCoord[texSet],
329 ctx->Current.Texcoord[texSet] );
330 }
331 }
332
333 if (ctx->RenderMode==GL_SELECT) {
334 gl_update_hitflag( ctx, ctx->Current.RasterPos[2] );
335 }
336
337 }
338
339
340
341 void
342 _mesa_RasterPos2d(GLdouble x, GLdouble y)
343 {
344 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
345 }
346
347 void
348 _mesa_RasterPos2f(GLfloat x, GLfloat y)
349 {
350 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
351 }
352
353 void
354 _mesa_RasterPos2i(GLint x, GLint y)
355 {
356 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
357 }
358
359 void
360 _mesa_RasterPos2s(GLshort x, GLshort y)
361 {
362 _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
363 }
364
365 void
366 _mesa_RasterPos3d(GLdouble x, GLdouble y, GLdouble z)
367 {
368 _mesa_RasterPos4f(x, y, z, 1.0F);
369 }
370
371 void
372 _mesa_RasterPos3f(GLfloat x, GLfloat y, GLfloat z)
373 {
374 _mesa_RasterPos4f(x, y, z, 1.0F);
375 }
376
377 void
378 _mesa_RasterPos3i(GLint x, GLint y, GLint z)
379 {
380 _mesa_RasterPos4f(x, y, z, 1.0F);
381 }
382
383 void
384 _mesa_RasterPos3s(GLshort x, GLshort y, GLshort z)
385 {
386 _mesa_RasterPos4f(x, y, z, 1.0F);
387 }
388
389 void
390 _mesa_RasterPos4d(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
391 {
392 _mesa_RasterPos4f(x, y, z, w);
393 }
394
395 void
396 _mesa_RasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
397 {
398 GET_CURRENT_CONTEXT(ctx);
399 raster_pos4f(ctx, x, y, z, w);
400 }
401
402 void
403 _mesa_RasterPos4i(GLint x, GLint y, GLint z, GLint w)
404 {
405 _mesa_RasterPos4f(x, y, z, w);
406 }
407
408 void
409 _mesa_RasterPos4s(GLshort x, GLshort y, GLshort z, GLshort w)
410 {
411 _mesa_RasterPos4f(x, y, z, w);
412 }
413
414 void
415 _mesa_RasterPos2dv(const GLdouble *v)
416 {
417 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
418 }
419
420 void
421 _mesa_RasterPos2fv(const GLfloat *v)
422 {
423 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
424 }
425
426 void
427 _mesa_RasterPos2iv(const GLint *v)
428 {
429 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
430 }
431
432 void
433 _mesa_RasterPos2sv(const GLshort *v)
434 {
435 _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
436 }
437
438 void
439 _mesa_RasterPos3dv(const GLdouble *v)
440 {
441 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
442 }
443
444 void
445 _mesa_RasterPos3fv(const GLfloat *v)
446 {
447 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
448 }
449
450 void
451 _mesa_RasterPos3iv(const GLint *v)
452 {
453 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
454 }
455
456 void
457 _mesa_RasterPos3sv(const GLshort *v)
458 {
459 _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
460 }
461
462 void
463 _mesa_RasterPos4dv(const GLdouble *v)
464 {
465 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
466 }
467
468 void
469 _mesa_RasterPos4fv(const GLfloat *v)
470 {
471 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
472 }
473
474 void
475 _mesa_RasterPos4iv(const GLint *v)
476 {
477 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
478 }
479
480 void
481 _mesa_RasterPos4sv(const GLshort *v)
482 {
483 _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
484 }