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comparison old/simple_render/SpanC.cpp @ 507:735f76483bb2

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Reorganization..
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 12 Oct 2009 09:39:35 +0900
parents TaskManager/Test/simple_render/SpanC.cpp@f64d75473f95
children
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506:1d4a8a86f26b 507:735f76483bb2
1 #include <iostream>
2 #include "SpanC.h"
3 #include "triangle.h"
4 #include "polygon.h"
5 using namespace std;
6
7
8 // f1:xの増加量 f2:yの増加量 i:....... base:基本となる頂点のy座標
9 static float calc(float f1, float f2,int i, float base){
10 float ans;
11 ans = f1/f2*i + base;
12 return ans;
13 }
14
15
16 static Vertex *vMid1(Vertex *vMid1,Vertex *vMin, Vertex *vMid, Vertex *vMax) {
17 float d,d1;
18
19 vMid1->y = vMid->y;
20 //vMid1->tex_y = vMid->tex_y;
21 d = (int)vMax->y-(int)vMin->y;
22 d1 = (int)vMid->y - (int)vMin->y;
23 /*
24
25 if (-1.0<=vMax->y&&vMax->y<=1.0) {
26 a = 0.5;
27 } else {
28 a = (vMax->x-vMin->x)/d;
29 }
30 */
31 //vMid1->tex_x = vMin->tex_x + a * (vMax->tex_x-vMin->tex_x);
32 vMid1->tex_x = calc(vMax->tex_x - vMin->tex_x, d, (int)d1 , vMin->tex_x);
33 vMid1->tex_y = calc(vMax->tex_y - vMin->tex_y, d, (int)d1 , vMin->tex_y);
34 //vMid1->x = vMin->x + a * (vMax->y -vMin->y);
35 vMid1->x = calc(vMax->x - vMin->x, d, (int)d1 , vMin->x);
36 //vMid1->z = vMin->z + a * (vMax->y -vMin->y);
37 vMid1->z = calc(vMax->z - vMin->z, d, (int)d1 , vMin->z);
38 //printf("x:%f y:%f z:%f tex_x:%f tex_y:%f\n",vMid1->x,vMid1->y,vMid1->z,vMid1->tex_x, vMid1->tex_y);
39 return vMid1;
40 }
41
42
43
44 void
45 Span_c::half_triangle(Vertex *vMin, Vertex *vMid, Vertex *vMid1,
46 SDL_Surface *image)
47 {
48
49 float tmp_z,tmp_tex1, tmp_tex2 ,tmp_tey1,tmp_tey2;
50 //tmp_x,tmp_y,tmp_ypos ......unused
51 float tex_x, tex_y,tex_z;
52 float tmp_xpos,tmp_end,tmp_zpos;
53 int tex_xpos,tex_ypos,tex_zpos;
54 int i,j;
55 float div_y;
56 Uint32 rgb;
57 float z,zpos;
58 int x,y;
59 int k =0;
60 int l = 1;
61 //float incli_x1, incli_x2;
62 //float incli_z1, incli_z2;
63 //float base_x1, base_x2 , base_z1, base_z2;
64 //int base_y;
65
66 /*
67 incli_x1 = vMid1->x - vMin->x;
68 incli_x2 = vMid->x - vMin->x;
69 incli_z1 = vMid1->z - vMin->z;
70 incli_z2 = vMid->z - vMin->z;
71 base_x1 = vMin->x;
72 base_x2 = vMin->x;
73 base_z1 = vMin->z;
74 base_z2 = vMin->z;
75 */
76 //cout << vMin->x << vMin->y << vMin->z << endl;
77 int start_y = (int)vMid->y;
78 int end_y = (int)vMin->y;
79
80 if (start_y<end_y) {
81 int i; i=end_y; end_y=start_y; start_y = i; //yの入れ替え
82 //Vertex *v; v = vMin; vMin = vMid; vMid = v;
83 /*
84 incli_x1 = vMin->x - vMid->x; incli_x2 = vMin->x - vMid1->x;
85 incli_z1 = vMin->z - vMid->z; incli_z2 = vMin->z - vMid1->z;
86 base_z1 = vMid->z; base_z2 = vMid1->z;
87 base_y = (int)vMid->y;
88 */
89 k = 1;
90 l = -1;
91 }
92
93
94
95 div_y = start_y - end_y; // > 0
96
97 //if(div_y < 1 && div_y > -1) div_y = 1;
98 for(i = k; i < div_y+1; i++) {
99 //ここでspanの左端と右端のx,zを求めてる
100 tmp_xpos = calc(vMid1->x - vMin->x ,div_y, i, vMin->x);
101 tmp_end = calc(vMid->x - vMin->x ,div_y, i, vMin->x);
102 tmp_z = calc(vMid1->z - vMin->z ,div_y, i, vMin->z);
103 tmp_zpos = calc(vMid->z - vMin->z ,div_y, i, vMin->z);
104 //printf("x:%f end:%f z:%f zpos:%f\n",tmp_xpos,tmp_end,tmp_z,tmp_zpos);
105 //ここからspanの左端と右端に対応するテクスチャを計算する
106 tmp_tex1 =((i/(div_y)) * vMid1->tex_x) + \
107 ( ((div_y - i)/(div_y)) * vMin->tex_x);
108 tmp_tex2 =( (i/(div_y)) * vMid->tex_x) + \
109 ( ((div_y - i)/(div_y)) * vMin->tex_x);
110
111 tmp_tey1 =( (i/(div_y)) * vMid1->tex_y) + \
112 ( ((div_y - i)/(div_y)) * vMin->tex_y);
113 tmp_tey2 =( (i/(div_y)) * vMid->tex_y) + \
114 ( ((div_y - i)/(div_y)) * vMin->tex_y);
115
116 //ここで左端がxposかendを判断し、描画するspanを作る
117 if(tmp_xpos > tmp_end) {
118 x = (int)tmp_end;
119 y = (int)vMin->y + i*l;
120 end = (int)(tmp_xpos)-(int)(tmp_end)+1;
121 z = tmp_zpos;
122 zpos = tmp_z;
123 tex1 = tmp_tex2;
124 tex2 = tmp_tex1;
125 tey1 = tmp_tey2;
126 tey2 = tmp_tey1;
127 } else {
128 x = (int)tmp_xpos;
129 y = (int)vMin->y + i*l;
130 end = (int)(tmp_end)-(int)(tmp_xpos)+1;
131 z = tmp_z;
132 zpos = tmp_zpos;
133 tex1 = tmp_tex1;
134 tex2 = tmp_tex2;
135 tey1 = tmp_tey1;
136 tey2 = tmp_tey2;
137 }
138 //printf("%d:%f,%f ",(int)vMin->y + i,xpos,end);
139 //printf("%d:%d:%d:x:%d,end:%d\n",x, y , end,(int)(tmp_end),(int)(tmp_xpos));
140 //printf("x:%d y:%d end:%d z:%f zpos:%f\n",x,y,end,z , zpos);
141 //printf("tex1:%f tex2:%f tey1:%f tey2:%f\n",tex1,tex2,tey1,tey2);
142 if(end == 1) {
143 //printf("tex_x:%f tex_y:%f\n",tex1,tex2);
144 if(tex1 > 1) tex1 = 1;
145 if(tey1 > 1) tey1 = 1;
146 tex_xpos = (int)((image->h-1) * tex1);
147 tex_ypos = (int)((image->w-1) * tey1);
148 tex_zpos = (int)z;
149 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
150 //printf("image->h:%d tex_x:%f\n",image->h,tex1);
151 rgb = p->get_rgb(tex_xpos,tex_ypos);
152 viewer->write_pixel(x,y,zpos,rgb);
153 }else {
154 for(j = 0; j < end; j++) {
155 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
156 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
157 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
158 if(tex_x > 1) tex_x = 1;
159 if(tex_y > 1) tex_y = 1;
160 tex_xpos = (int)((image->h-1) * tex_x);
161 tex_ypos = (int)((image->w-1) * tex_y);
162 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
163 //printf("z:%f zpos:%f tex_z:%f\n",z,zpos,tex_z);
164 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
165 rgb = p->get_rgb(tex_xpos,tex_ypos);
166 viewer->write_pixel(j+x,y,tex_z,rgb);
167 }
168 }
169 }
170 }
171
172 void Span_c::create_span(Triangle *tri,SDL_Surface *image) {
173 Vertex *vMin , *vMid, *vMax;
174 /*
175 float tmp_z,tmp_tex1, tmp_tex2 ,tmp_tey1,tmp_tey2;
176 //tmp_x,tmp_y,tmp_ypos ......unused
177 float tex_x, tex_y,tex_z;
178 float tmp_xpos,tmp_end,tmp_zpos;
179 int top_triangle;
180 int tex_xpos,tex_ypos,tex_zpos;
181 int i,j;
182 float div_x,div_y;
183 float z,zpos;
184 Uint32 rgb;
185 */
186
187 //cout << "x = " << tri->vertex1->x << endl;
188 if(tri->vertex1->y <= tri->vertex2->y) {
189 if(tri->vertex2->y <= tri->vertex3->y) {
190 //printf("condition 1\n");
191 vMin = tri->vertex1;
192 vMid = tri->vertex2;
193 vMax = tri->vertex3;
194 } else if(tri->vertex3->y <= tri->vertex1->y) {
195 //printf("condition 2\n");
196 vMin = tri->vertex3;
197 vMid = tri->vertex1;
198 vMax = tri->vertex2;
199 } else {
200 //printf("condition 3\n");
201 vMin = tri->vertex1;
202 vMid = tri->vertex3;
203 vMax = tri->vertex2;
204 }
205 } else {
206 if(tri->vertex1->y <= tri->vertex3->y) {
207 //printf("condition 4\n");
208 vMin = tri->vertex2;
209 vMid = tri->vertex1;
210 vMax = tri->vertex3;
211 } else if(tri->vertex3->y <= tri->vertex2->y) {
212 //printf("condition 5\n");
213 vMin = tri->vertex3;
214 vMid = tri->vertex2;
215 vMax = tri->vertex1;
216 } else {
217 //printf("condition 6\n");
218 vMin = tri->vertex2;
219 vMid = tri->vertex3;
220 vMax = tri->vertex1;
221 }
222 }
223
224 Vertex *vMid10 = new Vertex(0,0,0,0,0);
225 vMid1(vMid10,vMin,vMid,vMax);
226
227 half_triangle(vMin,vMid,vMid10,image);
228 half_triangle(vMax,vMid,vMid10,image);
229
230 free(vMid10);
231 #if 0
232 //cout << vMin->x << vMin->y << vMin->z << endl;
233 div_x = (int)vMid->y - (int)vMin->y;
234 if(div_x < 1 && div_x > -1) div_x = 1;
235 div_y = (int)vMax->y - (int)vMin->y;
236 if(div_y < 1 && div_y > -1) div_y = 1;
237
238 for(i = 0; i < div_x+1; i++) {
239 //ここでspanの左端と右端のx,zを求めてる
240 tmp_xpos = calc(vMax->x - vMin->x,div_y, i, vMin->x);
241 tmp_end = calc(vMid->x - vMin->x,div_x, i, vMin->x);
242 tmp_z = calc(vMax->z - vMin->z,div_y, i, vMin->z);
243 tmp_zpos = calc(vMid->z - vMin->z,div_x, i, vMin->z);
244
245 //ここからspanの左端と右端に対応するテクスチャを計算する
246 tmp_tex1 =( (i/(div_y)) * vMax->tex_x) + \
247 ( ((div_y - i)/(div_y)) * vMin->tex_x);
248 tmp_tex2 =( (i/(div_x)) * vMid->tex_x) + \
249 ( ((div_x - i)/(div_x)) * vMin->tex_x);
250
251 tmp_tey1 =( (i/(div_y)) * vMax->tex_y) + \
252 ( ((div_y - i)/(div_y)) * vMin->tex_y);
253 tmp_tey2 =( (i/(div_x)) * vMid->tex_y) + \
254 ( ((div_x - i)/(div_x)) * vMin->tex_y);
255
256 //ここで左端がxposかendを判断し、描画するspanを作る
257 if(tmp_xpos > tmp_end) {
258 x = (int)tmp_end;
259 y = (int)vMin->y + i;
260 end = (int)(tmp_xpos)-(int)(tmp_end)+1;
261 z = tmp_z;
262 zpos = tmp_zpos;
263 tex1 = tmp_tex2;
264 tex2 = tmp_tex1;
265 tey1 = tmp_tey2;
266 tey2 = tmp_tey1;
267 } else {
268 x = (int)tmp_xpos;
269 y = (int)vMin->y + i;
270 end = (int)(tmp_end)-(int)(tmp_xpos)+1;
271 z = tmp_zpos;
272 zpos = tmp_z;
273 tex1 = tmp_tex1;
274 tex2 = tmp_tex2;
275 tey1 = tmp_tey1;
276 tey2 = tmp_tey2;
277 }
278 //printf("%d:%f,%f ",(int)vMin->y + i,xpos,end);
279 //printf("%d:%d:%d:x:%d,end:%d\n",x, y , end,(int)(tmp_end),(int)(tmp_xpos));
280 //printf("x:%d y:%d end:%d z:%f zpos:%f\n",x,y,end,z , zpos);
281 //printf("tex1:%f tex2:%f tey1:%f tey2:%f\n",tex1,tex2,tey1,tey2);
282 if(end == 1) {
283 //printf("tex_x:%f tex_y:%f\n",tex1,tex2);
284 if(tex1 > 1) tex1 = 1;
285 if(tey1 > 1) tey1 = 1;
286 tex_xpos = (int)(image->h-1) * tex1;
287 tex_ypos = (int)(image->w-1) * tey1;
288 tex_zpos = z;
289 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
290 //printf("image->h:%d tex_x:%f\n",image->h,tex1);
291 rgb = p->get_rgb(tex_xpos,tex_ypos);
292 viewer->write_pixel(x,y,zpos,rgb);
293 }else {
294 for(j = 0; j < end; j++) {
295 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
296 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
297 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
298 if(tex_x > 1) tex_x = 1;
299 if(tex_y > 1) tex_y = 1;
300 tex_xpos = (int)(image->h-1) * tex_x;
301 tex_ypos = (int)(image->w-1) * tex_y;
302 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
303 //printf("z:%f zpos:%f tex_z:%f\n",z,zpos,tex_z);
304 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
305 rgb = p->get_rgb(tex_xpos,tex_ypos);
306 viewer->write_pixel(j+x,y,tex_z,rgb);
307 }
308 }
309 }
310
311 top_triangle = (int)vMid->y - (int)vMin->y;
312 div_x = (int)vMax->y - (int)vMid->y;
313 if(div_x < 1 && div_x > -1) div_x = 1;
314 div_y = (int)vMax->y - (int)vMin->y;
315 if(div_y < 1 && div_y > -1) div_y = 1;
316
317 for(i = 0; i < div_x; i++) {
318 //ここでspanの左端と右端のx,zを求めてる
319 tmp_xpos = calc(vMax->x-vMin->x, div_y, (i+1+top_triangle), vMin->x);
320 tmp_end = calc(vMax->x-vMid->x, div_x, (i+1), vMid->x);
321 tmp_z = calc(vMax->z-vMin->z, div_y, (i+1+top_triangle), vMin->z);
322 tmp_zpos = calc(vMax->z-vMid->z, div_x, (i+1), vMid->z);
323
324 tmp_tex1 =( ((i + 1 +top_triangle)/(div_y)) * vMax->tex_x) + \
325 ( ((div_y - i - 1 - top_triangle)/(div_y)) * vMin->tex_x);
326 tmp_tex2 =( ((i+1)/(div_x)) * vMax->tex_x) + \
327 ( ((div_x - i -1)/(div_x)) * vMid->tex_x);
328
329 tmp_tey1 =( ((i+1+top_triangle)/(div_y)) * vMax->tex_y) + \
330 ( ((div_y - i - 1 - top_triangle)/(div_y)) * vMin->tex_y);
331 tmp_tey2 =( ((i+1)/(div_x)) * vMax->tex_y) + \
332 ( ((div_x - i -1)/(div_x)) * vMid->tex_y);
333 if(tmp_xpos > tmp_end) {
334 x = (int)tmp_end;
335 y = (int)vMid->y+i+1;
336 end = (int)(tmp_xpos)-(int)(tmp_end)+1;
337 z = tmp_z;
338 zpos = tmp_zpos;
339 tex1 = tmp_tex2;
340 tex2 = tmp_tex1;
341 tey1 = tmp_tey2;
342 tey2 = tmp_tey1;
343 } else {
344 x = (int)tmp_xpos;
345 y = (int)vMid->y+i+1;
346 end = (int)(tmp_end)-(int)(tmp_xpos)+1;
347 z = tmp_zpos;
348 zpos = tmp_z;
349 tex1 = tmp_tex1;
350 tex2 = tmp_tex2;
351 tey1 = tmp_tey1;
352 tey2 = tmp_tey2;
353 }
354 if(end == 0) end = 1;
355 //printf("%d:%d:%d\n",x, y , end);
356 //printf("x:%d y:%d end:%d z:%f zpos:%f\n",x,y,end,z,zpos);
357 //printf("tex1:%f tex2:%f tey1:%f tey2:%f\n",tex1,tex2,tey1,tey2);
358 if(end == 1) {
359 //printf("tex_x:%f tex_y:%f\n",tex1,tex2);
360 if(tex1 > 1) tex1 = 1;
361 if(tey1 > 1) tey1 = 1;
362 tex_xpos = (int)(image->h-1) * tex1;
363 tex_ypos = (int)(image->w-1) * tey1;
364 tex_zpos = z;
365 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
366 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
367 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
368 rgb = p->get_rgb(tex_xpos,tex_ypos);
369 viewer->write_pixel(x,y,tex_zpos,rgb);
370 }else {
371 for(j = 0; j < end; j++) {
372 tex_x = tex1*(end-1-j)/(end-1) + tex2*j/(end-1);
373 tex_y = tey1*(end-1-j)/(end-1) + tey2*j/(end-1);
374 tex_z = z*(end-1-j)/(end-1) + zpos*j/(end-1);
375 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
376 if(tex_x > 1) tex_x = 1;
377 if(tex_y > 1) tex_y = 1;
378 tex_xpos = (int)(image->h-2) * tex_x;
379 tex_ypos = (int)(image->w-1) * tex_y;
380 //printf("z:%f zpos:%f tex_z:%f\n",z,zpos,tex_z);
381 //printf("tex_xpos:%d tex_ypos:%d\n",tex_xpos,tex_ypos);
382 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
383 //printf("tex_x:%f tex_y:%f\n",tex_x,tex_y);
384 rgb = p->get_rgb(tex_xpos,tex_ypos);
385 viewer->write_pixel(j+x,y,tex_z,rgb);
386 }
387 }
388 }
389 #endif
390 }
391
392 // i:分子、f1:長さ f2:対応する頂点1 f3:対応する頂点2
393 /*
394 float Span::calc2(int i, float f1, float f2, float f3) {
395 float ans;
396 ans = i/f1 * f2 + (f1-i)/f1 * f3;
397
398 */