-
Notifications
You must be signed in to change notification settings - Fork 0
/
renderer.c
360 lines (345 loc) · 12.9 KB
/
renderer.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
#include <string.h>
#include <stdlib.h>
#include "utils.h"
#include "settings.h"
#include "voxelgrid.h"
#include "renderer.h"
#include "font.xbm"
int renderer_save(Renderer *renderer, Settings *settings){
// check that everything is ok
if(renderer->surface == NULL){
return 1;
}
// let cairo handle the writing for us
cairo_surface_write_to_png(renderer->surface,settings->out_filename);
return 0;
}
Renderer *renderer_create(){
Renderer *renderer = (Renderer*)malloc(sizeof(Renderer));
// set pointers to NULL to note that they're unallocated
renderer->surface = NULL;
renderer->face_map = NULL;
return renderer;
}
void renderer_free(Renderer *renderer){
if(renderer->pixels != NULL){
// free pixels (probably isn't necessary, but make sure)
free(renderer->pixels);
}
if(renderer->surface != NULL){
// free surface
cairo_surface_destroy(renderer->surface);
}
if(renderer->face_map != NULL){
// free face map
free(renderer->face_map);
}
free(renderer);
}
void renderer_render(Renderer *renderer, Settings *settings, VoxelGrid *voxelgrid){
int x,y,z;
unsigned int origin_x;
unsigned int origin_y;
unsigned int face_id;
unsigned int *face_map;
// free previous face map
// TODO: reuse if the image size hasn't changed?
if(renderer->face_map != NULL){
// free face map
free(renderer->face_map);
}
// if the voxelgrid isn't valid
if(voxelgrid == NULL)
{
// return without doing anything
return;
}
// final image height (padded by one voxel)
renderer->image_height = (voxelgrid->dim_x+voxelgrid->dim_y+2*voxelgrid->dim_z+1)*settings->face_size/2;
// final image width (padded by one voxel)
renderer->image_width = settings->face_size*(voxelgrid->dim_x+voxelgrid->dim_y+1);
// image stride
renderer->stride = cairo_format_stride_for_width(CAIRO_FORMAT_RGB24,renderer->image_width);
// temporary storage for the pixel data
renderer->pixels = (Color *)malloc(renderer->image_height*renderer->stride);
// initialize pixels
memset(renderer->pixels,0xffffff,renderer->image_height*renderer->stride);
// where to place the 0,0,0 voxel
origin_x = settings->face_size + settings->face_size/2;
origin_y = (voxelgrid->dim_y)*settings->face_size/2-settings->face_size/4;
// id of the currently drawn face
face_id = 1;
// store the face index of each pixel
renderer->face_map = (unsigned int *)malloc(renderer->image_height*renderer->stride);
memset(renderer->face_map,0,renderer->image_height*renderer->stride);
// for each voxel
for(x=voxelgrid->dim_x-1;x>-1;x--){
for(y=0;y<voxelgrid->dim_y;y++){
for(z=0;z<voxelgrid->dim_z;z++){
// if the current voxel is filled
if (VOXEL (voxelgrid, x, y, z) == 1) {
// placement relative to other voxels
int offset_x = y+x;
int pos_x = origin_x+(offset_x)*(settings->face_size);
int offset_y = x-y+2*z;
int pos_y = origin_y+(offset_y)*(settings->face_size/2);
// draw left face
draw_face(pos_x,pos_y,FACE_LEFT,face_id, settings, renderer);
// increase face id
face_id++;
// draw right face
draw_face(pos_x,pos_y,FACE_RIGHT,face_id, settings, renderer);
// increase face id
face_id++;
// draw top face
draw_face(pos_x,pos_y,FACE_TOP,face_id, settings, renderer);
// increase face id
face_id++;
}
}
}
}
// set number of faces
renderer->num_faces = face_id;
// draw the number of each face (if the user wants us to)
if(settings->numbered_faces){
draw_numbers(renderer, settings);
}
// - create cairo surface -
// free previous surface
// TODO: reuse if image size hasn't changed?
if(renderer->surface != NULL){
cairo_surface_destroy(renderer->surface);
}
// create surface
renderer->surface = cairo_image_surface_create_for_data((unsigned char*)renderer->pixels,CAIRO_FORMAT_RGB24,renderer->image_width, renderer->image_height, renderer->stride);
}
void draw_numbers(Renderer *renderer, Settings *settings){
// iterators
unsigned int x,y,face;
// - store the min and max coordinates for each face -
//
// minimum x coordinate
unsigned int *accum_x = (unsigned int*)malloc(renderer->num_faces*sizeof(int));
unsigned int *accum_y = (unsigned int*)malloc(renderer->num_faces*sizeof(int));
// number of pixels per face
unsigned int *count = (unsigned int*)malloc(renderer->num_faces*sizeof(int));
// which number to draw on each face
unsigned int *face_number = (unsigned int*)malloc(renderer->num_faces*sizeof(int));
// initialize all coordinates to zero
memset(accum_y,0,renderer->num_faces*sizeof(int));
memset(accum_x,0,renderer->num_faces*sizeof(int));
// initialize count to zero
memset(count,0,renderer->num_faces*sizeof(int));
// initialize face numbers to zero
memset(face_number,0,renderer->num_faces*sizeof(int));
// start with zero as current face
face =0;
// for each pixel
for(y=0;y<renderer->image_height;y++){
for(x=0;x<renderer->image_width;x++){
// get the pixel value
unsigned int face_id = renderer->face_map[x+renderer->image_width*y];
// if it's not the background
if(face_id != 0){
// find which face it is
face_id--;
// update coordinate
accum_x[face_id] += x;
accum_y[face_id] += y;
// update pixel count
count[face_id]++;
// if this is the first time we've encountered this face
if(count[face_id]==1){
// update face number
face_number[face_id] = face;
face++;
}
}
}
}
// for each face
for(face=0;face<renderer->num_faces;face++){
// if we've found it
if(count[face]!=0){
// draw the number in the middle of each face
// middle x pos
unsigned middle_x = accum_x[face]/count[face];
// middle y pos
unsigned middle_y = accum_y[face]/count[face];
draw_number(renderer, middle_x, middle_y,face_number[face]);
}
}
// free our arrays
free(accum_x);
free(accum_y);
free(count);
}
void draw_face(int x, int y, enum FaceOrientation orientation, unsigned int face_id, Settings *settings, Renderer *renderer){
// outline color
// face color
Color face_color;
// used for filling faces
unsigned x_pos = 1;
unsigned y_pos = 1;
if(orientation == FACE_TOP){
// top face
face_color = settings->face_color+COLOR(settings->light[2],settings->light[2],settings->light[2]);
// - fill -
// offset y (since we're drawing the top face)
y_pos = settings->face_size;
// for the entire width of the face
while(x_pos<settings->face_size){
// draw a line
draw_diagonal_line(x+x_pos,y+y_pos,-1,settings,renderer,face_color,face_id);
// offset in y
y_pos++;
// draw a line
draw_diagonal_line(x+x_pos,y+y_pos,-1,settings,renderer,face_color,face_id);
// offset in x
x_pos++;
// draw a second line (two steps in x for each step in y)
draw_diagonal_line(x+x_pos,y+y_pos,-1,settings,renderer,face_color,face_id);
// offset in x
x_pos++;
}
// - draw outlines -
// if user wants us to
if(settings->outlines){
// draw bottom left
draw_diagonal_line(x,y+settings->face_size,1,settings,renderer,settings->outline_color,0);
// draw bottom right
draw_diagonal_line(x,y+settings->face_size,-1,settings,renderer,settings->outline_color,0);
// draw top left
draw_diagonal_line(x-settings->face_size,y+settings->face_size+settings->face_size/2,1,settings,renderer,settings->outline_color,0);
// draw top right
draw_diagonal_line(x+settings->face_size,y+settings->face_size+settings->face_size/2,-1,settings,renderer,settings->outline_color,0);
// add pixel at top
unsigned int pixel = (x+renderer->image_width*(renderer->image_height-y-2*settings->face_size));
renderer->pixels[pixel] = COLOR(0,0,0);
}
}
else{
char direction = orientation == FACE_LEFT ? -1:1;
// color of the face
unsigned char light = orientation == FACE_LEFT ? settings->light[1]:settings->light[0];
face_color = settings->face_color+COLOR(light,light,light);
// - fill -
// for the entire height of the face
for(y_pos=0;y_pos <= settings->face_size;y_pos++){
// draw a line, offset in y
draw_diagonal_line(x,y+y_pos,direction,settings,renderer,face_color,face_id);
}
// - draw outlines -
// if user wants us to
if(settings->outlines){
// draw bottom
draw_diagonal_line(x,y,direction,settings,renderer,settings->outline_color,0);
// draw top
draw_diagonal_line(x,y+settings->face_size,direction,settings,renderer,settings->outline_color,0);
// draw middle edge
draw_vertical_line(x,y,settings,renderer,settings->outline_color,0);
// draw side edge
draw_vertical_line(x+direction*settings->face_size,y+settings->face_size/2,settings,renderer,settings->outline_color,0);
}
}
}
inline void draw_diagonal_line(int x, int y, int direction, Settings *settings,Renderer *renderer, Color color, unsigned int face_id){
// iterator
unsigned int i;
// current pixel index
int pixel;
// y should skip an entire row each time
y =(renderer->image_height - y)*renderer->image_width;
// util we've drawn the entire line
for(i=0;i<(int)settings->face_size;i+=2){
// draw first pixel
pixel = x+y;
renderer->pixels[pixel] = color;
renderer->face_map[x+y] = face_id;
// increase x
x+=direction;
pixel = x+y;
// draw second pixel
renderer->pixels[pixel] = color;
renderer->face_map[x+y] = face_id;
// increase x
x+=direction;
// increase y
y-= renderer->image_width;
}
}
inline void draw_vertical_line(int x, int y, Settings *settings, Renderer *renderer, Color color, unsigned int face_id){
// iterator
int i;
// current pixel index
int pixel;
// y should skip an entire row each time
y =(renderer->image_height - y)*renderer->image_width;
// until we've drawn the entire line
for(i=0;i<(int)settings->face_size;i++){
pixel = x+y;
// draw pixel
renderer->pixels[pixel] = color;
renderer->face_map[x+y] = face_id;
// increase y
y-= renderer->image_width;
}
}
void draw_number(Renderer *renderer, unsigned int x, unsigned int y, unsigned int number){
// maximum number of digits to print
const unsigned int MAX_DIGITS = 5;
// iterators
unsigned int row,pixel;
unsigned int i;
// offset relative to center of face
int offset;
// array of digits
unsigned char digits[MAX_DIGITS];
// initialize digits to 0 (to note that they should not be drawn)
memset(digits,0,MAX_DIGITS*sizeof(char));
// for each digit in number
i=0;
do{
// get last digit
digits[i] = number%10;
// remove digit from number
number /= 10;
// increase iterator
i++;
}
while(number != 0 && i!=MAX_DIGITS);
// center digits
offset = i*2-1;
// for each digit
while(i>0){
// decrease iterator
i--;
// - draw digit -
// for each row
for(row=0;row<6;row++){
// read correct byte
unsigned char byte = font_bits[digits[i]/2+5*row];
// if it's an odd digit
if(digits[i]&1){
// get upper nybble
byte = byte >> 4;
}
// for each pixel
for(pixel=0;pixel<4;pixel++)
{
// get correct bit
unsigned char bit = byte &1;
// shift bits in nybble one step
byte = byte >> 1;
// if the pixel is filled in
if(bit)
{
// add it to the image
renderer->pixels[pixel+x-offset+(y+row-2)*renderer->image_width] = 0;
}
}
}
offset-= 4;
}
}