1 #include "nuklear.h"
2 #include "nuklear_internal.h"
3
4 /* ===============================================================
5 *
6 * VERTEX
7 *
8 * ===============================================================*/
9 #ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
10 NK_API void
nk_draw_list_init(struct nk_draw_list * list)11 nk_draw_list_init(struct nk_draw_list *list)
12 {
13 nk_size i = 0;
14 NK_ASSERT(list);
15 if (!list) return;
16 nk_zero(list, sizeof(*list));
17 for (i = 0; i < NK_LEN(list->circle_vtx); ++i) {
18 const float a = ((float)i / (float)NK_LEN(list->circle_vtx)) * 2 * NK_PI;
19 list->circle_vtx[i].x = (float)NK_COS(a);
20 list->circle_vtx[i].y = (float)NK_SIN(a);
21 }
22 }
23 NK_API void
nk_draw_list_setup(struct nk_draw_list * canvas,const struct nk_convert_config * config,struct nk_buffer * cmds,struct nk_buffer * vertices,struct nk_buffer * elements,enum nk_anti_aliasing line_aa,enum nk_anti_aliasing shape_aa)24 nk_draw_list_setup(struct nk_draw_list *canvas, const struct nk_convert_config *config,
25 struct nk_buffer *cmds, struct nk_buffer *vertices, struct nk_buffer *elements,
26 enum nk_anti_aliasing line_aa, enum nk_anti_aliasing shape_aa)
27 {
28 NK_ASSERT(canvas);
29 NK_ASSERT(config);
30 NK_ASSERT(cmds);
31 NK_ASSERT(vertices);
32 NK_ASSERT(elements);
33 if (!canvas || !config || !cmds || !vertices || !elements)
34 return;
35
36 canvas->buffer = cmds;
37 canvas->config = *config;
38 canvas->elements = elements;
39 canvas->vertices = vertices;
40 canvas->line_AA = line_aa;
41 canvas->shape_AA = shape_aa;
42 canvas->clip_rect = nk_null_rect;
43
44 canvas->cmd_offset = 0;
45 canvas->element_count = 0;
46 canvas->vertex_count = 0;
47 canvas->cmd_offset = 0;
48 canvas->cmd_count = 0;
49 canvas->path_count = 0;
50 }
51 NK_API const struct nk_draw_command*
nk__draw_list_begin(const struct nk_draw_list * canvas,const struct nk_buffer * buffer)52 nk__draw_list_begin(const struct nk_draw_list *canvas, const struct nk_buffer *buffer)
53 {
54 nk_byte *memory;
55 nk_size offset;
56 const struct nk_draw_command *cmd;
57
58 NK_ASSERT(buffer);
59 if (!buffer || !buffer->size || !canvas->cmd_count)
60 return 0;
61
62 memory = (nk_byte*)buffer->memory.ptr;
63 offset = buffer->memory.size - canvas->cmd_offset;
64 cmd = nk_ptr_add(const struct nk_draw_command, memory, offset);
65 return cmd;
66 }
67 NK_API const struct nk_draw_command*
nk__draw_list_end(const struct nk_draw_list * canvas,const struct nk_buffer * buffer)68 nk__draw_list_end(const struct nk_draw_list *canvas, const struct nk_buffer *buffer)
69 {
70 nk_size size;
71 nk_size offset;
72 nk_byte *memory;
73 const struct nk_draw_command *end;
74
75 NK_ASSERT(buffer);
76 NK_ASSERT(canvas);
77 if (!buffer || !canvas)
78 return 0;
79
80 memory = (nk_byte*)buffer->memory.ptr;
81 size = buffer->memory.size;
82 offset = size - canvas->cmd_offset;
83 end = nk_ptr_add(const struct nk_draw_command, memory, offset);
84 end -= (canvas->cmd_count-1);
85 return end;
86 }
87 NK_API const struct nk_draw_command*
nk__draw_list_next(const struct nk_draw_command * cmd,const struct nk_buffer * buffer,const struct nk_draw_list * canvas)88 nk__draw_list_next(const struct nk_draw_command *cmd,
89 const struct nk_buffer *buffer, const struct nk_draw_list *canvas)
90 {
91 const struct nk_draw_command *end;
92 NK_ASSERT(buffer);
93 NK_ASSERT(canvas);
94 if (!cmd || !buffer || !canvas)
95 return 0;
96
97 end = nk__draw_list_end(canvas, buffer);
98 if (cmd <= end) return 0;
99 return (cmd-1);
100 }
101 NK_INTERN struct nk_vec2*
nk_draw_list_alloc_path(struct nk_draw_list * list,int count)102 nk_draw_list_alloc_path(struct nk_draw_list *list, int count)
103 {
104 struct nk_vec2 *points;
105 NK_STORAGE const nk_size point_align = NK_ALIGNOF(struct nk_vec2);
106 NK_STORAGE const nk_size point_size = sizeof(struct nk_vec2);
107 points = (struct nk_vec2*)
108 nk_buffer_alloc(list->buffer, NK_BUFFER_FRONT,
109 point_size * (nk_size)count, point_align);
110
111 if (!points) return 0;
112 if (!list->path_offset) {
113 void *memory = nk_buffer_memory(list->buffer);
114 list->path_offset = (unsigned int)((nk_byte*)points - (nk_byte*)memory);
115 }
116 list->path_count += (unsigned int)count;
117 return points;
118 }
119 NK_INTERN struct nk_vec2
nk_draw_list_path_last(struct nk_draw_list * list)120 nk_draw_list_path_last(struct nk_draw_list *list)
121 {
122 void *memory;
123 struct nk_vec2 *point;
124 NK_ASSERT(list->path_count);
125 memory = nk_buffer_memory(list->buffer);
126 point = nk_ptr_add(struct nk_vec2, memory, list->path_offset);
127 point += (list->path_count-1);
128 return *point;
129 }
130 NK_INTERN struct nk_draw_command*
nk_draw_list_push_command(struct nk_draw_list * list,struct nk_rect clip,nk_handle texture)131 nk_draw_list_push_command(struct nk_draw_list *list, struct nk_rect clip,
132 nk_handle texture)
133 {
134 NK_STORAGE const nk_size cmd_align = NK_ALIGNOF(struct nk_draw_command);
135 NK_STORAGE const nk_size cmd_size = sizeof(struct nk_draw_command);
136 struct nk_draw_command *cmd;
137
138 NK_ASSERT(list);
139 cmd = (struct nk_draw_command*)
140 nk_buffer_alloc(list->buffer, NK_BUFFER_BACK, cmd_size, cmd_align);
141
142 if (!cmd) return 0;
143 if (!list->cmd_count) {
144 nk_byte *memory = (nk_byte*)nk_buffer_memory(list->buffer);
145 nk_size total = nk_buffer_total(list->buffer);
146 memory = nk_ptr_add(nk_byte, memory, total);
147 list->cmd_offset = (nk_size)(memory - (nk_byte*)cmd);
148 }
149
150 cmd->elem_count = 0;
151 cmd->clip_rect = clip;
152 cmd->texture = texture;
153 #ifdef NK_INCLUDE_COMMAND_USERDATA
154 cmd->userdata = list->userdata;
155 #endif
156
157 list->cmd_count++;
158 list->clip_rect = clip;
159 return cmd;
160 }
161 NK_INTERN struct nk_draw_command*
nk_draw_list_command_last(struct nk_draw_list * list)162 nk_draw_list_command_last(struct nk_draw_list *list)
163 {
164 void *memory;
165 nk_size size;
166 struct nk_draw_command *cmd;
167 NK_ASSERT(list->cmd_count);
168
169 memory = nk_buffer_memory(list->buffer);
170 size = nk_buffer_total(list->buffer);
171 cmd = nk_ptr_add(struct nk_draw_command, memory, size - list->cmd_offset);
172 return (cmd - (list->cmd_count-1));
173 }
174 NK_INTERN void
nk_draw_list_add_clip(struct nk_draw_list * list,struct nk_rect rect)175 nk_draw_list_add_clip(struct nk_draw_list *list, struct nk_rect rect)
176 {
177 NK_ASSERT(list);
178 if (!list) return;
179 if (!list->cmd_count) {
180 nk_draw_list_push_command(list, rect, list->config.null.texture);
181 } else {
182 struct nk_draw_command *prev = nk_draw_list_command_last(list);
183 if (prev->elem_count == 0)
184 prev->clip_rect = rect;
185 nk_draw_list_push_command(list, rect, prev->texture);
186 }
187 }
188 NK_INTERN void
nk_draw_list_push_image(struct nk_draw_list * list,nk_handle texture)189 nk_draw_list_push_image(struct nk_draw_list *list, nk_handle texture)
190 {
191 NK_ASSERT(list);
192 if (!list) return;
193 if (!list->cmd_count) {
194 nk_draw_list_push_command(list, nk_null_rect, texture);
195 } else {
196 struct nk_draw_command *prev = nk_draw_list_command_last(list);
197 if (prev->elem_count == 0) {
198 prev->texture = texture;
199 #ifdef NK_INCLUDE_COMMAND_USERDATA
200 prev->userdata = list->userdata;
201 #endif
202 } else if (prev->texture.id != texture.id
203 #ifdef NK_INCLUDE_COMMAND_USERDATA
204 || prev->userdata.id != list->userdata.id
205 #endif
206 ) nk_draw_list_push_command(list, prev->clip_rect, texture);
207 }
208 }
209 #ifdef NK_INCLUDE_COMMAND_USERDATA
210 NK_API void
nk_draw_list_push_userdata(struct nk_draw_list * list,nk_handle userdata)211 nk_draw_list_push_userdata(struct nk_draw_list *list, nk_handle userdata)
212 {
213 list->userdata = userdata;
214 }
215 #endif
216 NK_INTERN void*
nk_draw_list_alloc_vertices(struct nk_draw_list * list,nk_size count)217 nk_draw_list_alloc_vertices(struct nk_draw_list *list, nk_size count)
218 {
219 void *vtx;
220 NK_ASSERT(list);
221 if (!list) return 0;
222 vtx = nk_buffer_alloc(list->vertices, NK_BUFFER_FRONT,
223 list->config.vertex_size*count, list->config.vertex_alignment);
224 if (!vtx) return 0;
225 list->vertex_count += (unsigned int)count;
226
227 /* This assert triggers because your are drawing a lot of stuff and nuklear
228 * defined `nk_draw_index` as `nk_ushort` to safe space be default.
229 *
230 * So you reached the maximum number of indicies or rather vertexes.
231 * To solve this issue please change typdef `nk_draw_index` to `nk_uint`
232 * and don't forget to specify the new element size in your drawing
233 * backend (OpenGL, DirectX, ...). For example in OpenGL for `glDrawElements`
234 * instead of specifing `GL_UNSIGNED_SHORT` you have to define `GL_UNSIGNED_INT`.
235 * Sorry for the inconvenience. */
236 if(sizeof(nk_draw_index)==2) NK_ASSERT((list->vertex_count < NK_USHORT_MAX &&
237 "To many verticies for 16-bit vertex indicies. Please read comment above on how to solve this problem"));
238 return vtx;
239 }
240 NK_INTERN nk_draw_index*
nk_draw_list_alloc_elements(struct nk_draw_list * list,nk_size count)241 nk_draw_list_alloc_elements(struct nk_draw_list *list, nk_size count)
242 {
243 nk_draw_index *ids;
244 struct nk_draw_command *cmd;
245 NK_STORAGE const nk_size elem_align = NK_ALIGNOF(nk_draw_index);
246 NK_STORAGE const nk_size elem_size = sizeof(nk_draw_index);
247 NK_ASSERT(list);
248 if (!list) return 0;
249
250 ids = (nk_draw_index*)
251 nk_buffer_alloc(list->elements, NK_BUFFER_FRONT, elem_size*count, elem_align);
252 if (!ids) return 0;
253 cmd = nk_draw_list_command_last(list);
254 list->element_count += (unsigned int)count;
255 cmd->elem_count += (unsigned int)count;
256 return ids;
257 }
258 NK_INTERN int
nk_draw_vertex_layout_element_is_end_of_layout(const struct nk_draw_vertex_layout_element * element)259 nk_draw_vertex_layout_element_is_end_of_layout(
260 const struct nk_draw_vertex_layout_element *element)
261 {
262 return (element->attribute == NK_VERTEX_ATTRIBUTE_COUNT ||
263 element->format == NK_FORMAT_COUNT);
264 }
265 NK_INTERN void
nk_draw_vertex_color(void * attr,const float * vals,enum nk_draw_vertex_layout_format format)266 nk_draw_vertex_color(void *attr, const float *vals,
267 enum nk_draw_vertex_layout_format format)
268 {
269 /* if this triggers you tried to provide a value format for a color */
270 float val[4];
271 NK_ASSERT(format >= NK_FORMAT_COLOR_BEGIN);
272 NK_ASSERT(format <= NK_FORMAT_COLOR_END);
273 if (format < NK_FORMAT_COLOR_BEGIN || format > NK_FORMAT_COLOR_END) return;
274
275 val[0] = NK_SATURATE(vals[0]);
276 val[1] = NK_SATURATE(vals[1]);
277 val[2] = NK_SATURATE(vals[2]);
278 val[3] = NK_SATURATE(vals[3]);
279
280 switch (format) {
281 default: NK_ASSERT(0 && "Invalid vertex layout color format"); break;
282 case NK_FORMAT_R8G8B8A8:
283 case NK_FORMAT_R8G8B8: {
284 struct nk_color col = nk_rgba_fv(val);
285 NK_MEMCPY(attr, &col.r, sizeof(col));
286 } break;
287 case NK_FORMAT_B8G8R8A8: {
288 struct nk_color col = nk_rgba_fv(val);
289 struct nk_color bgra = nk_rgba(col.b, col.g, col.r, col.a);
290 NK_MEMCPY(attr, &bgra, sizeof(bgra));
291 } break;
292 case NK_FORMAT_R16G15B16: {
293 nk_ushort col[3];
294 col[0] = (nk_ushort)(val[0]*(float)NK_USHORT_MAX);
295 col[1] = (nk_ushort)(val[1]*(float)NK_USHORT_MAX);
296 col[2] = (nk_ushort)(val[2]*(float)NK_USHORT_MAX);
297 NK_MEMCPY(attr, col, sizeof(col));
298 } break;
299 case NK_FORMAT_R16G15B16A16: {
300 nk_ushort col[4];
301 col[0] = (nk_ushort)(val[0]*(float)NK_USHORT_MAX);
302 col[1] = (nk_ushort)(val[1]*(float)NK_USHORT_MAX);
303 col[2] = (nk_ushort)(val[2]*(float)NK_USHORT_MAX);
304 col[3] = (nk_ushort)(val[3]*(float)NK_USHORT_MAX);
305 NK_MEMCPY(attr, col, sizeof(col));
306 } break;
307 case NK_FORMAT_R32G32B32: {
308 nk_uint col[3];
309 col[0] = (nk_uint)(val[0]*(float)NK_UINT_MAX);
310 col[1] = (nk_uint)(val[1]*(float)NK_UINT_MAX);
311 col[2] = (nk_uint)(val[2]*(float)NK_UINT_MAX);
312 NK_MEMCPY(attr, col, sizeof(col));
313 } break;
314 case NK_FORMAT_R32G32B32A32: {
315 nk_uint col[4];
316 col[0] = (nk_uint)(val[0]*(float)NK_UINT_MAX);
317 col[1] = (nk_uint)(val[1]*(float)NK_UINT_MAX);
318 col[2] = (nk_uint)(val[2]*(float)NK_UINT_MAX);
319 col[3] = (nk_uint)(val[3]*(float)NK_UINT_MAX);
320 NK_MEMCPY(attr, col, sizeof(col));
321 } break;
322 case NK_FORMAT_R32G32B32A32_FLOAT:
323 NK_MEMCPY(attr, val, sizeof(float)*4);
324 break;
325 case NK_FORMAT_R32G32B32A32_DOUBLE: {
326 double col[4];
327 col[0] = (double)val[0];
328 col[1] = (double)val[1];
329 col[2] = (double)val[2];
330 col[3] = (double)val[3];
331 NK_MEMCPY(attr, col, sizeof(col));
332 } break;
333 case NK_FORMAT_RGB32:
334 case NK_FORMAT_RGBA32: {
335 struct nk_color col = nk_rgba_fv(val);
336 nk_uint color = nk_color_u32(col);
337 NK_MEMCPY(attr, &color, sizeof(color));
338 } break; }
339 }
340 NK_INTERN void
nk_draw_vertex_element(void * dst,const float * values,int value_count,enum nk_draw_vertex_layout_format format)341 nk_draw_vertex_element(void *dst, const float *values, int value_count,
342 enum nk_draw_vertex_layout_format format)
343 {
344 int value_index;
345 void *attribute = dst;
346 /* if this triggers you tried to provide a color format for a value */
347 NK_ASSERT(format < NK_FORMAT_COLOR_BEGIN);
348 if (format >= NK_FORMAT_COLOR_BEGIN && format <= NK_FORMAT_COLOR_END) return;
349 for (value_index = 0; value_index < value_count; ++value_index) {
350 switch (format) {
351 default: NK_ASSERT(0 && "invalid vertex layout format"); break;
352 case NK_FORMAT_SCHAR: {
353 char value = (char)NK_CLAMP((float)NK_SCHAR_MIN, values[value_index], (float)NK_SCHAR_MAX);
354 NK_MEMCPY(attribute, &value, sizeof(value));
355 attribute = (void*)((char*)attribute + sizeof(char));
356 } break;
357 case NK_FORMAT_SSHORT: {
358 nk_short value = (nk_short)NK_CLAMP((float)NK_SSHORT_MIN, values[value_index], (float)NK_SSHORT_MAX);
359 NK_MEMCPY(attribute, &value, sizeof(value));
360 attribute = (void*)((char*)attribute + sizeof(value));
361 } break;
362 case NK_FORMAT_SINT: {
363 nk_int value = (nk_int)NK_CLAMP((float)NK_SINT_MIN, values[value_index], (float)NK_SINT_MAX);
364 NK_MEMCPY(attribute, &value, sizeof(value));
365 attribute = (void*)((char*)attribute + sizeof(nk_int));
366 } break;
367 case NK_FORMAT_UCHAR: {
368 unsigned char value = (unsigned char)NK_CLAMP((float)NK_UCHAR_MIN, values[value_index], (float)NK_UCHAR_MAX);
369 NK_MEMCPY(attribute, &value, sizeof(value));
370 attribute = (void*)((char*)attribute + sizeof(unsigned char));
371 } break;
372 case NK_FORMAT_USHORT: {
373 nk_ushort value = (nk_ushort)NK_CLAMP((float)NK_USHORT_MIN, values[value_index], (float)NK_USHORT_MAX);
374 NK_MEMCPY(attribute, &value, sizeof(value));
375 attribute = (void*)((char*)attribute + sizeof(value));
376 } break;
377 case NK_FORMAT_UINT: {
378 nk_uint value = (nk_uint)NK_CLAMP((float)NK_UINT_MIN, values[value_index], (float)NK_UINT_MAX);
379 NK_MEMCPY(attribute, &value, sizeof(value));
380 attribute = (void*)((char*)attribute + sizeof(nk_uint));
381 } break;
382 case NK_FORMAT_FLOAT:
383 NK_MEMCPY(attribute, &values[value_index], sizeof(values[value_index]));
384 attribute = (void*)((char*)attribute + sizeof(float));
385 break;
386 case NK_FORMAT_DOUBLE: {
387 double value = (double)values[value_index];
388 NK_MEMCPY(attribute, &value, sizeof(value));
389 attribute = (void*)((char*)attribute + sizeof(double));
390 } break;
391 }
392 }
393 }
394 NK_INTERN void*
nk_draw_vertex(void * dst,const struct nk_convert_config * config,struct nk_vec2 pos,struct nk_vec2 uv,struct nk_colorf color)395 nk_draw_vertex(void *dst, const struct nk_convert_config *config,
396 struct nk_vec2 pos, struct nk_vec2 uv, struct nk_colorf color)
397 {
398 void *result = (void*)((char*)dst + config->vertex_size);
399 const struct nk_draw_vertex_layout_element *elem_iter = config->vertex_layout;
400 while (!nk_draw_vertex_layout_element_is_end_of_layout(elem_iter)) {
401 void *address = (void*)((char*)dst + elem_iter->offset);
402 switch (elem_iter->attribute) {
403 case NK_VERTEX_ATTRIBUTE_COUNT:
404 default: NK_ASSERT(0 && "wrong element attribute"); break;
405 case NK_VERTEX_POSITION: nk_draw_vertex_element(address, &pos.x, 2, elem_iter->format); break;
406 case NK_VERTEX_TEXCOORD: nk_draw_vertex_element(address, &uv.x, 2, elem_iter->format); break;
407 case NK_VERTEX_COLOR: nk_draw_vertex_color(address, &color.r, elem_iter->format); break;
408 }
409 elem_iter++;
410 }
411 return result;
412 }
413 NK_API void
nk_draw_list_stroke_poly_line(struct nk_draw_list * list,const struct nk_vec2 * points,const unsigned int points_count,struct nk_color color,enum nk_draw_list_stroke closed,float thickness,enum nk_anti_aliasing aliasing)414 nk_draw_list_stroke_poly_line(struct nk_draw_list *list, const struct nk_vec2 *points,
415 const unsigned int points_count, struct nk_color color, enum nk_draw_list_stroke closed,
416 float thickness, enum nk_anti_aliasing aliasing)
417 {
418 nk_size count;
419 int thick_line;
420 struct nk_colorf col;
421 struct nk_colorf col_trans;
422 NK_ASSERT(list);
423 if (!list || points_count < 2) return;
424
425 color.a = (nk_byte)((float)color.a * list->config.global_alpha);
426 count = points_count;
427 if (!closed) count = points_count-1;
428 thick_line = thickness > 1.0f;
429
430 #ifdef NK_INCLUDE_COMMAND_USERDATA
431 nk_draw_list_push_userdata(list, list->userdata);
432 #endif
433
434 color.a = (nk_byte)((float)color.a * list->config.global_alpha);
435 nk_color_fv(&col.r, color);
436 col_trans = col;
437 col_trans.a = 0;
438
439 if (aliasing == NK_ANTI_ALIASING_ON) {
440 /* ANTI-ALIASED STROKE */
441 const float AA_SIZE = 1.0f;
442 NK_STORAGE const nk_size pnt_align = NK_ALIGNOF(struct nk_vec2);
443 NK_STORAGE const nk_size pnt_size = sizeof(struct nk_vec2);
444
445 /* allocate vertices and elements */
446 nk_size i1 = 0;
447 nk_size vertex_offset;
448 nk_size index = list->vertex_count;
449
450 const nk_size idx_count = (thick_line) ? (count * 18) : (count * 12);
451 const nk_size vtx_count = (thick_line) ? (points_count * 4): (points_count *3);
452
453 void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
454 nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);
455
456 nk_size size;
457 struct nk_vec2 *normals, *temp;
458 if (!vtx || !ids) return;
459
460 /* temporary allocate normals + points */
461 vertex_offset = (nk_size)((nk_byte*)vtx - (nk_byte*)list->vertices->memory.ptr);
462 nk_buffer_mark(list->vertices, NK_BUFFER_FRONT);
463 size = pnt_size * ((thick_line) ? 5 : 3) * points_count;
464 normals = (struct nk_vec2*) nk_buffer_alloc(list->vertices, NK_BUFFER_FRONT, size, pnt_align);
465 if (!normals) return;
466 temp = normals + points_count;
467
468 /* make sure vertex pointer is still correct */
469 vtx = (void*)((nk_byte*)list->vertices->memory.ptr + vertex_offset);
470
471 /* calculate normals */
472 for (i1 = 0; i1 < count; ++i1) {
473 const nk_size i2 = ((i1 + 1) == points_count) ? 0 : (i1 + 1);
474 struct nk_vec2 diff = nk_vec2_sub(points[i2], points[i1]);
475 float len;
476
477 /* vec2 inverted length */
478 len = nk_vec2_len_sqr(diff);
479 if (len != 0.0f)
480 len = nk_inv_sqrt(len);
481 else len = 1.0f;
482
483 diff = nk_vec2_muls(diff, len);
484 normals[i1].x = diff.y;
485 normals[i1].y = -diff.x;
486 }
487
488 if (!closed)
489 normals[points_count-1] = normals[points_count-2];
490
491 if (!thick_line) {
492 nk_size idx1, i;
493 if (!closed) {
494 struct nk_vec2 d;
495 temp[0] = nk_vec2_add(points[0], nk_vec2_muls(normals[0], AA_SIZE));
496 temp[1] = nk_vec2_sub(points[0], nk_vec2_muls(normals[0], AA_SIZE));
497 d = nk_vec2_muls(normals[points_count-1], AA_SIZE);
498 temp[(points_count-1) * 2 + 0] = nk_vec2_add(points[points_count-1], d);
499 temp[(points_count-1) * 2 + 1] = nk_vec2_sub(points[points_count-1], d);
500 }
501
502 /* fill elements */
503 idx1 = index;
504 for (i1 = 0; i1 < count; i1++) {
505 struct nk_vec2 dm;
506 float dmr2;
507 nk_size i2 = ((i1 + 1) == points_count) ? 0 : (i1 + 1);
508 nk_size idx2 = ((i1+1) == points_count) ? index: (idx1 + 3);
509
510 /* average normals */
511 dm = nk_vec2_muls(nk_vec2_add(normals[i1], normals[i2]), 0.5f);
512 dmr2 = dm.x * dm.x + dm.y* dm.y;
513 if (dmr2 > 0.000001f) {
514 float scale = 1.0f/dmr2;
515 scale = NK_MIN(100.0f, scale);
516 dm = nk_vec2_muls(dm, scale);
517 }
518
519 dm = nk_vec2_muls(dm, AA_SIZE);
520 temp[i2*2+0] = nk_vec2_add(points[i2], dm);
521 temp[i2*2+1] = nk_vec2_sub(points[i2], dm);
522
523 ids[0] = (nk_draw_index)(idx2 + 0); ids[1] = (nk_draw_index)(idx1+0);
524 ids[2] = (nk_draw_index)(idx1 + 2); ids[3] = (nk_draw_index)(idx1+2);
525 ids[4] = (nk_draw_index)(idx2 + 2); ids[5] = (nk_draw_index)(idx2+0);
526 ids[6] = (nk_draw_index)(idx2 + 1); ids[7] = (nk_draw_index)(idx1+1);
527 ids[8] = (nk_draw_index)(idx1 + 0); ids[9] = (nk_draw_index)(idx1+0);
528 ids[10]= (nk_draw_index)(idx2 + 0); ids[11]= (nk_draw_index)(idx2+1);
529 ids += 12;
530 idx1 = idx2;
531 }
532
533 /* fill vertices */
534 for (i = 0; i < points_count; ++i) {
535 const struct nk_vec2 uv = list->config.null.uv;
536 vtx = nk_draw_vertex(vtx, &list->config, points[i], uv, col);
537 vtx = nk_draw_vertex(vtx, &list->config, temp[i*2+0], uv, col_trans);
538 vtx = nk_draw_vertex(vtx, &list->config, temp[i*2+1], uv, col_trans);
539 }
540 } else {
541 nk_size idx1, i;
542 const float half_inner_thickness = (thickness - AA_SIZE) * 0.5f;
543 if (!closed) {
544 struct nk_vec2 d1 = nk_vec2_muls(normals[0], half_inner_thickness + AA_SIZE);
545 struct nk_vec2 d2 = nk_vec2_muls(normals[0], half_inner_thickness);
546
547 temp[0] = nk_vec2_add(points[0], d1);
548 temp[1] = nk_vec2_add(points[0], d2);
549 temp[2] = nk_vec2_sub(points[0], d2);
550 temp[3] = nk_vec2_sub(points[0], d1);
551
552 d1 = nk_vec2_muls(normals[points_count-1], half_inner_thickness + AA_SIZE);
553 d2 = nk_vec2_muls(normals[points_count-1], half_inner_thickness);
554
555 temp[(points_count-1)*4+0] = nk_vec2_add(points[points_count-1], d1);
556 temp[(points_count-1)*4+1] = nk_vec2_add(points[points_count-1], d2);
557 temp[(points_count-1)*4+2] = nk_vec2_sub(points[points_count-1], d2);
558 temp[(points_count-1)*4+3] = nk_vec2_sub(points[points_count-1], d1);
559 }
560
561 /* add all elements */
562 idx1 = index;
563 for (i1 = 0; i1 < count; ++i1) {
564 struct nk_vec2 dm_out, dm_in;
565 const nk_size i2 = ((i1+1) == points_count) ? 0: (i1 + 1);
566 nk_size idx2 = ((i1+1) == points_count) ? index: (idx1 + 4);
567
568 /* average normals */
569 struct nk_vec2 dm = nk_vec2_muls(nk_vec2_add(normals[i1], normals[i2]), 0.5f);
570 float dmr2 = dm.x * dm.x + dm.y* dm.y;
571 if (dmr2 > 0.000001f) {
572 float scale = 1.0f/dmr2;
573 scale = NK_MIN(100.0f, scale);
574 dm = nk_vec2_muls(dm, scale);
575 }
576
577 dm_out = nk_vec2_muls(dm, ((half_inner_thickness) + AA_SIZE));
578 dm_in = nk_vec2_muls(dm, half_inner_thickness);
579 temp[i2*4+0] = nk_vec2_add(points[i2], dm_out);
580 temp[i2*4+1] = nk_vec2_add(points[i2], dm_in);
581 temp[i2*4+2] = nk_vec2_sub(points[i2], dm_in);
582 temp[i2*4+3] = nk_vec2_sub(points[i2], dm_out);
583
584 /* add indexes */
585 ids[0] = (nk_draw_index)(idx2 + 1); ids[1] = (nk_draw_index)(idx1+1);
586 ids[2] = (nk_draw_index)(idx1 + 2); ids[3] = (nk_draw_index)(idx1+2);
587 ids[4] = (nk_draw_index)(idx2 + 2); ids[5] = (nk_draw_index)(idx2+1);
588 ids[6] = (nk_draw_index)(idx2 + 1); ids[7] = (nk_draw_index)(idx1+1);
589 ids[8] = (nk_draw_index)(idx1 + 0); ids[9] = (nk_draw_index)(idx1+0);
590 ids[10]= (nk_draw_index)(idx2 + 0); ids[11] = (nk_draw_index)(idx2+1);
591 ids[12]= (nk_draw_index)(idx2 + 2); ids[13] = (nk_draw_index)(idx1+2);
592 ids[14]= (nk_draw_index)(idx1 + 3); ids[15] = (nk_draw_index)(idx1+3);
593 ids[16]= (nk_draw_index)(idx2 + 3); ids[17] = (nk_draw_index)(idx2+2);
594 ids += 18;
595 idx1 = idx2;
596 }
597
598 /* add vertices */
599 for (i = 0; i < points_count; ++i) {
600 const struct nk_vec2 uv = list->config.null.uv;
601 vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+0], uv, col_trans);
602 vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+1], uv, col);
603 vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+2], uv, col);
604 vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+3], uv, col_trans);
605 }
606 }
607 /* free temporary normals + points */
608 nk_buffer_reset(list->vertices, NK_BUFFER_FRONT);
609 } else {
610 /* NON ANTI-ALIASED STROKE */
611 nk_size i1 = 0;
612 nk_size idx = list->vertex_count;
613 const nk_size idx_count = count * 6;
614 const nk_size vtx_count = count * 4;
615 void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
616 nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);
617 if (!vtx || !ids) return;
618
619 for (i1 = 0; i1 < count; ++i1) {
620 float dx, dy;
621 const struct nk_vec2 uv = list->config.null.uv;
622 const nk_size i2 = ((i1+1) == points_count) ? 0 : i1 + 1;
623 const struct nk_vec2 p1 = points[i1];
624 const struct nk_vec2 p2 = points[i2];
625 struct nk_vec2 diff = nk_vec2_sub(p2, p1);
626 float len;
627
628 /* vec2 inverted length */
629 len = nk_vec2_len_sqr(diff);
630 if (len != 0.0f)
631 len = nk_inv_sqrt(len);
632 else len = 1.0f;
633 diff = nk_vec2_muls(diff, len);
634
635 /* add vertices */
636 dx = diff.x * (thickness * 0.5f);
637 dy = diff.y * (thickness * 0.5f);
638
639 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p1.x + dy, p1.y - dx), uv, col);
640 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p2.x + dy, p2.y - dx), uv, col);
641 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p2.x - dy, p2.y + dx), uv, col);
642 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p1.x - dy, p1.y + dx), uv, col);
643
644 ids[0] = (nk_draw_index)(idx+0); ids[1] = (nk_draw_index)(idx+1);
645 ids[2] = (nk_draw_index)(idx+2); ids[3] = (nk_draw_index)(idx+0);
646 ids[4] = (nk_draw_index)(idx+2); ids[5] = (nk_draw_index)(idx+3);
647
648 ids += 6;
649 idx += 4;
650 }
651 }
652 }
653 NK_API void
nk_draw_list_fill_poly_convex(struct nk_draw_list * list,const struct nk_vec2 * points,const unsigned int points_count,struct nk_color color,enum nk_anti_aliasing aliasing)654 nk_draw_list_fill_poly_convex(struct nk_draw_list *list,
655 const struct nk_vec2 *points, const unsigned int points_count,
656 struct nk_color color, enum nk_anti_aliasing aliasing)
657 {
658 struct nk_colorf col;
659 struct nk_colorf col_trans;
660
661 NK_STORAGE const nk_size pnt_align = NK_ALIGNOF(struct nk_vec2);
662 NK_STORAGE const nk_size pnt_size = sizeof(struct nk_vec2);
663 NK_ASSERT(list);
664 if (!list || points_count < 3) return;
665
666 #ifdef NK_INCLUDE_COMMAND_USERDATA
667 nk_draw_list_push_userdata(list, list->userdata);
668 #endif
669
670 color.a = (nk_byte)((float)color.a * list->config.global_alpha);
671 nk_color_fv(&col.r, color);
672 col_trans = col;
673 col_trans.a = 0;
674
675 if (aliasing == NK_ANTI_ALIASING_ON) {
676 nk_size i = 0;
677 nk_size i0 = 0;
678 nk_size i1 = 0;
679
680 const float AA_SIZE = 1.0f;
681 nk_size vertex_offset = 0;
682 nk_size index = list->vertex_count;
683
684 const nk_size idx_count = (points_count-2)*3 + points_count*6;
685 const nk_size vtx_count = (points_count*2);
686
687 void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
688 nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);
689
690 nk_size size = 0;
691 struct nk_vec2 *normals = 0;
692 unsigned int vtx_inner_idx = (unsigned int)(index + 0);
693 unsigned int vtx_outer_idx = (unsigned int)(index + 1);
694 if (!vtx || !ids) return;
695
696 /* temporary allocate normals */
697 vertex_offset = (nk_size)((nk_byte*)vtx - (nk_byte*)list->vertices->memory.ptr);
698 nk_buffer_mark(list->vertices, NK_BUFFER_FRONT);
699 size = pnt_size * points_count;
700 normals = (struct nk_vec2*) nk_buffer_alloc(list->vertices, NK_BUFFER_FRONT, size, pnt_align);
701 if (!normals) return;
702 vtx = (void*)((nk_byte*)list->vertices->memory.ptr + vertex_offset);
703
704 /* add elements */
705 for (i = 2; i < points_count; i++) {
706 ids[0] = (nk_draw_index)(vtx_inner_idx);
707 ids[1] = (nk_draw_index)(vtx_inner_idx + ((i-1) << 1));
708 ids[2] = (nk_draw_index)(vtx_inner_idx + (i << 1));
709 ids += 3;
710 }
711
712 /* compute normals */
713 for (i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++) {
714 struct nk_vec2 p0 = points[i0];
715 struct nk_vec2 p1 = points[i1];
716 struct nk_vec2 diff = nk_vec2_sub(p1, p0);
717
718 /* vec2 inverted length */
719 float len = nk_vec2_len_sqr(diff);
720 if (len != 0.0f)
721 len = nk_inv_sqrt(len);
722 else len = 1.0f;
723 diff = nk_vec2_muls(diff, len);
724
725 normals[i0].x = diff.y;
726 normals[i0].y = -diff.x;
727 }
728
729 /* add vertices + indexes */
730 for (i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++) {
731 const struct nk_vec2 uv = list->config.null.uv;
732 struct nk_vec2 n0 = normals[i0];
733 struct nk_vec2 n1 = normals[i1];
734 struct nk_vec2 dm = nk_vec2_muls(nk_vec2_add(n0, n1), 0.5f);
735 float dmr2 = dm.x*dm.x + dm.y*dm.y;
736 if (dmr2 > 0.000001f) {
737 float scale = 1.0f / dmr2;
738 scale = NK_MIN(scale, 100.0f);
739 dm = nk_vec2_muls(dm, scale);
740 }
741 dm = nk_vec2_muls(dm, AA_SIZE * 0.5f);
742
743 /* add vertices */
744 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2_sub(points[i1], dm), uv, col);
745 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2_add(points[i1], dm), uv, col_trans);
746
747 /* add indexes */
748 ids[0] = (nk_draw_index)(vtx_inner_idx+(i1<<1));
749 ids[1] = (nk_draw_index)(vtx_inner_idx+(i0<<1));
750 ids[2] = (nk_draw_index)(vtx_outer_idx+(i0<<1));
751 ids[3] = (nk_draw_index)(vtx_outer_idx+(i0<<1));
752 ids[4] = (nk_draw_index)(vtx_outer_idx+(i1<<1));
753 ids[5] = (nk_draw_index)(vtx_inner_idx+(i1<<1));
754 ids += 6;
755 }
756 /* free temporary normals + points */
757 nk_buffer_reset(list->vertices, NK_BUFFER_FRONT);
758 } else {
759 nk_size i = 0;
760 nk_size index = list->vertex_count;
761 const nk_size idx_count = (points_count-2)*3;
762 const nk_size vtx_count = points_count;
763 void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
764 nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);
765
766 if (!vtx || !ids) return;
767 for (i = 0; i < vtx_count; ++i)
768 vtx = nk_draw_vertex(vtx, &list->config, points[i], list->config.null.uv, col);
769 for (i = 2; i < points_count; ++i) {
770 ids[0] = (nk_draw_index)index;
771 ids[1] = (nk_draw_index)(index+ i - 1);
772 ids[2] = (nk_draw_index)(index+i);
773 ids += 3;
774 }
775 }
776 }
777 NK_API void
nk_draw_list_path_clear(struct nk_draw_list * list)778 nk_draw_list_path_clear(struct nk_draw_list *list)
779 {
780 NK_ASSERT(list);
781 if (!list) return;
782 nk_buffer_reset(list->buffer, NK_BUFFER_FRONT);
783 list->path_count = 0;
784 list->path_offset = 0;
785 }
786 NK_API void
nk_draw_list_path_line_to(struct nk_draw_list * list,struct nk_vec2 pos)787 nk_draw_list_path_line_to(struct nk_draw_list *list, struct nk_vec2 pos)
788 {
789 struct nk_vec2 *points = 0;
790 struct nk_draw_command *cmd = 0;
791 NK_ASSERT(list);
792 if (!list) return;
793 if (!list->cmd_count)
794 nk_draw_list_add_clip(list, nk_null_rect);
795
796 cmd = nk_draw_list_command_last(list);
797 if (cmd && cmd->texture.ptr != list->config.null.texture.ptr)
798 nk_draw_list_push_image(list, list->config.null.texture);
799
800 points = nk_draw_list_alloc_path(list, 1);
801 if (!points) return;
802 points[0] = pos;
803 }
804 NK_API void
nk_draw_list_path_arc_to_fast(struct nk_draw_list * list,struct nk_vec2 center,float radius,int a_min,int a_max)805 nk_draw_list_path_arc_to_fast(struct nk_draw_list *list, struct nk_vec2 center,
806 float radius, int a_min, int a_max)
807 {
808 int a = 0;
809 NK_ASSERT(list);
810 if (!list) return;
811 if (a_min <= a_max) {
812 for (a = a_min; a <= a_max; a++) {
813 const struct nk_vec2 c = list->circle_vtx[(nk_size)a % NK_LEN(list->circle_vtx)];
814 const float x = center.x + c.x * radius;
815 const float y = center.y + c.y * radius;
816 nk_draw_list_path_line_to(list, nk_vec2(x, y));
817 }
818 }
819 }
820 NK_API void
nk_draw_list_path_arc_to(struct nk_draw_list * list,struct nk_vec2 center,float radius,float a_min,float a_max,unsigned int segments)821 nk_draw_list_path_arc_to(struct nk_draw_list *list, struct nk_vec2 center,
822 float radius, float a_min, float a_max, unsigned int segments)
823 {
824 unsigned int i = 0;
825 NK_ASSERT(list);
826 if (!list) return;
827 if (radius == 0.0f) return;
828
829 /* This algorithm for arc drawing relies on these two trigonometric identities[1]:
830 sin(a + b) = sin(a) * cos(b) + cos(a) * sin(b)
831 cos(a + b) = cos(a) * cos(b) - sin(a) * sin(b)
832
833 Two coordinates (x, y) of a point on a circle centered on
834 the origin can be written in polar form as:
835 x = r * cos(a)
836 y = r * sin(a)
837 where r is the radius of the circle,
838 a is the angle between (x, y) and the origin.
839
840 This allows us to rotate the coordinates around the
841 origin by an angle b using the following transformation:
842 x' = r * cos(a + b) = x * cos(b) - y * sin(b)
843 y' = r * sin(a + b) = y * cos(b) + x * sin(b)
844
845 [1] https://en.wikipedia.org/wiki/List_of_trigonometric_identities#Angle_sum_and_difference_identities
846 */
847 {const float d_angle = (a_max - a_min) / (float)segments;
848 const float sin_d = (float)NK_SIN(d_angle);
849 const float cos_d = (float)NK_COS(d_angle);
850
851 float cx = (float)NK_COS(a_min) * radius;
852 float cy = (float)NK_SIN(a_min) * radius;
853 for(i = 0; i <= segments; ++i) {
854 float new_cx, new_cy;
855 const float x = center.x + cx;
856 const float y = center.y + cy;
857 nk_draw_list_path_line_to(list, nk_vec2(x, y));
858
859 new_cx = cx * cos_d - cy * sin_d;
860 new_cy = cy * cos_d + cx * sin_d;
861 cx = new_cx;
862 cy = new_cy;
863 }}
864 }
865 NK_API void
nk_draw_list_path_rect_to(struct nk_draw_list * list,struct nk_vec2 a,struct nk_vec2 b,float rounding)866 nk_draw_list_path_rect_to(struct nk_draw_list *list, struct nk_vec2 a,
867 struct nk_vec2 b, float rounding)
868 {
869 float r;
870 NK_ASSERT(list);
871 if (!list) return;
872 r = rounding;
873 r = NK_MIN(r, ((b.x-a.x) < 0) ? -(b.x-a.x): (b.x-a.x));
874 r = NK_MIN(r, ((b.y-a.y) < 0) ? -(b.y-a.y): (b.y-a.y));
875
876 if (r == 0.0f) {
877 nk_draw_list_path_line_to(list, a);
878 nk_draw_list_path_line_to(list, nk_vec2(b.x,a.y));
879 nk_draw_list_path_line_to(list, b);
880 nk_draw_list_path_line_to(list, nk_vec2(a.x,b.y));
881 } else {
882 nk_draw_list_path_arc_to_fast(list, nk_vec2(a.x + r, a.y + r), r, 6, 9);
883 nk_draw_list_path_arc_to_fast(list, nk_vec2(b.x - r, a.y + r), r, 9, 12);
884 nk_draw_list_path_arc_to_fast(list, nk_vec2(b.x - r, b.y - r), r, 0, 3);
885 nk_draw_list_path_arc_to_fast(list, nk_vec2(a.x + r, b.y - r), r, 3, 6);
886 }
887 }
888 NK_API void
nk_draw_list_path_curve_to(struct nk_draw_list * list,struct nk_vec2 p2,struct nk_vec2 p3,struct nk_vec2 p4,unsigned int num_segments)889 nk_draw_list_path_curve_to(struct nk_draw_list *list, struct nk_vec2 p2,
890 struct nk_vec2 p3, struct nk_vec2 p4, unsigned int num_segments)
891 {
892 float t_step;
893 unsigned int i_step;
894 struct nk_vec2 p1;
895
896 NK_ASSERT(list);
897 NK_ASSERT(list->path_count);
898 if (!list || !list->path_count) return;
899 num_segments = NK_MAX(num_segments, 1);
900
901 p1 = nk_draw_list_path_last(list);
902 t_step = 1.0f/(float)num_segments;
903 for (i_step = 1; i_step <= num_segments; ++i_step) {
904 float t = t_step * (float)i_step;
905 float u = 1.0f - t;
906 float w1 = u*u*u;
907 float w2 = 3*u*u*t;
908 float w3 = 3*u*t*t;
909 float w4 = t * t *t;
910 float x = w1 * p1.x + w2 * p2.x + w3 * p3.x + w4 * p4.x;
911 float y = w1 * p1.y + w2 * p2.y + w3 * p3.y + w4 * p4.y;
912 nk_draw_list_path_line_to(list, nk_vec2(x,y));
913 }
914 }
915 NK_API void
nk_draw_list_path_fill(struct nk_draw_list * list,struct nk_color color)916 nk_draw_list_path_fill(struct nk_draw_list *list, struct nk_color color)
917 {
918 struct nk_vec2 *points;
919 NK_ASSERT(list);
920 if (!list) return;
921 points = (struct nk_vec2*)nk_buffer_memory(list->buffer);
922 nk_draw_list_fill_poly_convex(list, points, list->path_count, color, list->config.shape_AA);
923 nk_draw_list_path_clear(list);
924 }
925 NK_API void
nk_draw_list_path_stroke(struct nk_draw_list * list,struct nk_color color,enum nk_draw_list_stroke closed,float thickness)926 nk_draw_list_path_stroke(struct nk_draw_list *list, struct nk_color color,
927 enum nk_draw_list_stroke closed, float thickness)
928 {
929 struct nk_vec2 *points;
930 NK_ASSERT(list);
931 if (!list) return;
932 points = (struct nk_vec2*)nk_buffer_memory(list->buffer);
933 nk_draw_list_stroke_poly_line(list, points, list->path_count, color,
934 closed, thickness, list->config.line_AA);
935 nk_draw_list_path_clear(list);
936 }
937 NK_API void
nk_draw_list_stroke_line(struct nk_draw_list * list,struct nk_vec2 a,struct nk_vec2 b,struct nk_color col,float thickness)938 nk_draw_list_stroke_line(struct nk_draw_list *list, struct nk_vec2 a,
939 struct nk_vec2 b, struct nk_color col, float thickness)
940 {
941 NK_ASSERT(list);
942 if (!list || !col.a) return;
943 if (list->line_AA == NK_ANTI_ALIASING_ON) {
944 nk_draw_list_path_line_to(list, a);
945 nk_draw_list_path_line_to(list, b);
946 } else {
947 nk_draw_list_path_line_to(list, nk_vec2_sub(a,nk_vec2(0.5f,0.5f)));
948 nk_draw_list_path_line_to(list, nk_vec2_sub(b,nk_vec2(0.5f,0.5f)));
949 }
950 nk_draw_list_path_stroke(list, col, NK_STROKE_OPEN, thickness);
951 }
952 NK_API void
nk_draw_list_fill_rect(struct nk_draw_list * list,struct nk_rect rect,struct nk_color col,float rounding)953 nk_draw_list_fill_rect(struct nk_draw_list *list, struct nk_rect rect,
954 struct nk_color col, float rounding)
955 {
956 NK_ASSERT(list);
957 if (!list || !col.a) return;
958
959 if (list->line_AA == NK_ANTI_ALIASING_ON) {
960 nk_draw_list_path_rect_to(list, nk_vec2(rect.x, rect.y),
961 nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
962 } else {
963 nk_draw_list_path_rect_to(list, nk_vec2(rect.x-0.5f, rect.y-0.5f),
964 nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
965 } nk_draw_list_path_fill(list, col);
966 }
967 NK_API void
nk_draw_list_stroke_rect(struct nk_draw_list * list,struct nk_rect rect,struct nk_color col,float rounding,float thickness)968 nk_draw_list_stroke_rect(struct nk_draw_list *list, struct nk_rect rect,
969 struct nk_color col, float rounding, float thickness)
970 {
971 NK_ASSERT(list);
972 if (!list || !col.a) return;
973 if (list->line_AA == NK_ANTI_ALIASING_ON) {
974 nk_draw_list_path_rect_to(list, nk_vec2(rect.x, rect.y),
975 nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
976 } else {
977 nk_draw_list_path_rect_to(list, nk_vec2(rect.x-0.5f, rect.y-0.5f),
978 nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
979 } nk_draw_list_path_stroke(list, col, NK_STROKE_CLOSED, thickness);
980 }
981 NK_API void
nk_draw_list_fill_rect_multi_color(struct nk_draw_list * list,struct nk_rect rect,struct nk_color left,struct nk_color top,struct nk_color right,struct nk_color bottom)982 nk_draw_list_fill_rect_multi_color(struct nk_draw_list *list, struct nk_rect rect,
983 struct nk_color left, struct nk_color top, struct nk_color right,
984 struct nk_color bottom)
985 {
986 void *vtx;
987 struct nk_colorf col_left, col_top;
988 struct nk_colorf col_right, col_bottom;
989 nk_draw_index *idx;
990 nk_draw_index index;
991
992 nk_color_fv(&col_left.r, left);
993 nk_color_fv(&col_right.r, right);
994 nk_color_fv(&col_top.r, top);
995 nk_color_fv(&col_bottom.r, bottom);
996
997 NK_ASSERT(list);
998 if (!list) return;
999
1000 nk_draw_list_push_image(list, list->config.null.texture);
1001 index = (nk_draw_index)list->vertex_count;
1002 vtx = nk_draw_list_alloc_vertices(list, 4);
1003 idx = nk_draw_list_alloc_elements(list, 6);
1004 if (!vtx || !idx) return;
1005
1006 idx[0] = (nk_draw_index)(index+0); idx[1] = (nk_draw_index)(index+1);
1007 idx[2] = (nk_draw_index)(index+2); idx[3] = (nk_draw_index)(index+0);
1008 idx[4] = (nk_draw_index)(index+2); idx[5] = (nk_draw_index)(index+3);
1009
1010 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x, rect.y), list->config.null.uv, col_left);
1011 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x + rect.w, rect.y), list->config.null.uv, col_top);
1012 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x + rect.w, rect.y + rect.h), list->config.null.uv, col_right);
1013 vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x, rect.y + rect.h), list->config.null.uv, col_bottom);
1014 }
1015 NK_API void
nk_draw_list_fill_triangle(struct nk_draw_list * list,struct nk_vec2 a,struct nk_vec2 b,struct nk_vec2 c,struct nk_color col)1016 nk_draw_list_fill_triangle(struct nk_draw_list *list, struct nk_vec2 a,
1017 struct nk_vec2 b, struct nk_vec2 c, struct nk_color col)
1018 {
1019 NK_ASSERT(list);
1020 if (!list || !col.a) return;
1021 nk_draw_list_path_line_to(list, a);
1022 nk_draw_list_path_line_to(list, b);
1023 nk_draw_list_path_line_to(list, c);
1024 nk_draw_list_path_fill(list, col);
1025 }
1026 NK_API void
nk_draw_list_stroke_triangle(struct nk_draw_list * list,struct nk_vec2 a,struct nk_vec2 b,struct nk_vec2 c,struct nk_color col,float thickness)1027 nk_draw_list_stroke_triangle(struct nk_draw_list *list, struct nk_vec2 a,
1028 struct nk_vec2 b, struct nk_vec2 c, struct nk_color col, float thickness)
1029 {
1030 NK_ASSERT(list);
1031 if (!list || !col.a) return;
1032 nk_draw_list_path_line_to(list, a);
1033 nk_draw_list_path_line_to(list, b);
1034 nk_draw_list_path_line_to(list, c);
1035 nk_draw_list_path_stroke(list, col, NK_STROKE_CLOSED, thickness);
1036 }
1037 NK_API void
nk_draw_list_fill_circle(struct nk_draw_list * list,struct nk_vec2 center,float radius,struct nk_color col,unsigned int segs)1038 nk_draw_list_fill_circle(struct nk_draw_list *list, struct nk_vec2 center,
1039 float radius, struct nk_color col, unsigned int segs)
1040 {
1041 float a_max;
1042 NK_ASSERT(list);
1043 if (!list || !col.a) return;
1044 a_max = NK_PI * 2.0f * ((float)segs - 1.0f) / (float)segs;
1045 nk_draw_list_path_arc_to(list, center, radius, 0.0f, a_max, segs);
1046 nk_draw_list_path_fill(list, col);
1047 }
1048 NK_API void
nk_draw_list_stroke_circle(struct nk_draw_list * list,struct nk_vec2 center,float radius,struct nk_color col,unsigned int segs,float thickness)1049 nk_draw_list_stroke_circle(struct nk_draw_list *list, struct nk_vec2 center,
1050 float radius, struct nk_color col, unsigned int segs, float thickness)
1051 {
1052 float a_max;
1053 NK_ASSERT(list);
1054 if (!list || !col.a) return;
1055 a_max = NK_PI * 2.0f * ((float)segs - 1.0f) / (float)segs;
1056 nk_draw_list_path_arc_to(list, center, radius, 0.0f, a_max, segs);
1057 nk_draw_list_path_stroke(list, col, NK_STROKE_CLOSED, thickness);
1058 }
1059 NK_API void
nk_draw_list_stroke_curve(struct nk_draw_list * list,struct nk_vec2 p0,struct nk_vec2 cp0,struct nk_vec2 cp1,struct nk_vec2 p1,struct nk_color col,unsigned int segments,float thickness)1060 nk_draw_list_stroke_curve(struct nk_draw_list *list, struct nk_vec2 p0,
1061 struct nk_vec2 cp0, struct nk_vec2 cp1, struct nk_vec2 p1,
1062 struct nk_color col, unsigned int segments, float thickness)
1063 {
1064 NK_ASSERT(list);
1065 if (!list || !col.a) return;
1066 nk_draw_list_path_line_to(list, p0);
1067 nk_draw_list_path_curve_to(list, cp0, cp1, p1, segments);
1068 nk_draw_list_path_stroke(list, col, NK_STROKE_OPEN, thickness);
1069 }
1070 NK_INTERN void
nk_draw_list_push_rect_uv(struct nk_draw_list * list,struct nk_vec2 a,struct nk_vec2 c,struct nk_vec2 uva,struct nk_vec2 uvc,struct nk_color color)1071 nk_draw_list_push_rect_uv(struct nk_draw_list *list, struct nk_vec2 a,
1072 struct nk_vec2 c, struct nk_vec2 uva, struct nk_vec2 uvc,
1073 struct nk_color color)
1074 {
1075 void *vtx;
1076 struct nk_vec2 uvb;
1077 struct nk_vec2 uvd;
1078 struct nk_vec2 b;
1079 struct nk_vec2 d;
1080
1081 struct nk_colorf col;
1082 nk_draw_index *idx;
1083 nk_draw_index index;
1084 NK_ASSERT(list);
1085 if (!list) return;
1086
1087 nk_color_fv(&col.r, color);
1088 uvb = nk_vec2(uvc.x, uva.y);
1089 uvd = nk_vec2(uva.x, uvc.y);
1090 b = nk_vec2(c.x, a.y);
1091 d = nk_vec2(a.x, c.y);
1092
1093 index = (nk_draw_index)list->vertex_count;
1094 vtx = nk_draw_list_alloc_vertices(list, 4);
1095 idx = nk_draw_list_alloc_elements(list, 6);
1096 if (!vtx || !idx) return;
1097
1098 idx[0] = (nk_draw_index)(index+0); idx[1] = (nk_draw_index)(index+1);
1099 idx[2] = (nk_draw_index)(index+2); idx[3] = (nk_draw_index)(index+0);
1100 idx[4] = (nk_draw_index)(index+2); idx[5] = (nk_draw_index)(index+3);
1101
1102 vtx = nk_draw_vertex(vtx, &list->config, a, uva, col);
1103 vtx = nk_draw_vertex(vtx, &list->config, b, uvb, col);
1104 vtx = nk_draw_vertex(vtx, &list->config, c, uvc, col);
1105 vtx = nk_draw_vertex(vtx, &list->config, d, uvd, col);
1106 }
1107 NK_API void
nk_draw_list_add_image(struct nk_draw_list * list,struct nk_image texture,struct nk_rect rect,struct nk_color color)1108 nk_draw_list_add_image(struct nk_draw_list *list, struct nk_image texture,
1109 struct nk_rect rect, struct nk_color color)
1110 {
1111 NK_ASSERT(list);
1112 if (!list) return;
1113 /* push new command with given texture */
1114 nk_draw_list_push_image(list, texture.handle);
1115 if (nk_image_is_subimage(&texture)) {
1116 /* add region inside of the texture */
1117 struct nk_vec2 uv[2];
1118 uv[0].x = (float)texture.region[0]/(float)texture.w;
1119 uv[0].y = (float)texture.region[1]/(float)texture.h;
1120 uv[1].x = (float)(texture.region[0] + texture.region[2])/(float)texture.w;
1121 uv[1].y = (float)(texture.region[1] + texture.region[3])/(float)texture.h;
1122 nk_draw_list_push_rect_uv(list, nk_vec2(rect.x, rect.y),
1123 nk_vec2(rect.x + rect.w, rect.y + rect.h), uv[0], uv[1], color);
1124 } else nk_draw_list_push_rect_uv(list, nk_vec2(rect.x, rect.y),
1125 nk_vec2(rect.x + rect.w, rect.y + rect.h),
1126 nk_vec2(0.0f, 0.0f), nk_vec2(1.0f, 1.0f),color);
1127 }
1128 NK_API void
nk_draw_list_add_text(struct nk_draw_list * list,const struct nk_user_font * font,struct nk_rect rect,const char * text,int len,float font_height,struct nk_color fg)1129 nk_draw_list_add_text(struct nk_draw_list *list, const struct nk_user_font *font,
1130 struct nk_rect rect, const char *text, int len, float font_height,
1131 struct nk_color fg)
1132 {
1133 float x = 0;
1134 int text_len = 0;
1135 nk_rune unicode = 0;
1136 nk_rune next = 0;
1137 int glyph_len = 0;
1138 int next_glyph_len = 0;
1139 struct nk_user_font_glyph g;
1140
1141 NK_ASSERT(list);
1142 if (!list || !len || !text) return;
1143 if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
1144 list->clip_rect.x, list->clip_rect.y, list->clip_rect.w, list->clip_rect.h)) return;
1145
1146 nk_draw_list_push_image(list, font->texture);
1147 x = rect.x;
1148 glyph_len = nk_utf_decode(text, &unicode, len);
1149 if (!glyph_len) return;
1150
1151 /* draw every glyph image */
1152 fg.a = (nk_byte)((float)fg.a * list->config.global_alpha);
1153 while (text_len < len && glyph_len) {
1154 float gx, gy, gh, gw;
1155 float char_width = 0;
1156 if (unicode == NK_UTF_INVALID) break;
1157
1158 /* query currently drawn glyph information */
1159 next_glyph_len = nk_utf_decode(text + text_len + glyph_len, &next, (int)len - text_len);
1160 font->query(font->userdata, font_height, &g, unicode,
1161 (next == NK_UTF_INVALID) ? '\0' : next);
1162
1163 /* calculate and draw glyph drawing rectangle and image */
1164 gx = x + g.offset.x;
1165 gy = rect.y + g.offset.y;
1166 gw = g.width; gh = g.height;
1167 char_width = g.xadvance;
1168 nk_draw_list_push_rect_uv(list, nk_vec2(gx,gy), nk_vec2(gx + gw, gy+ gh),
1169 g.uv[0], g.uv[1], fg);
1170
1171 /* offset next glyph */
1172 text_len += glyph_len;
1173 x += char_width;
1174 glyph_len = next_glyph_len;
1175 unicode = next;
1176 }
1177 }
1178 NK_API nk_flags
nk_convert(struct nk_context * ctx,struct nk_buffer * cmds,struct nk_buffer * vertices,struct nk_buffer * elements,const struct nk_convert_config * config)1179 nk_convert(struct nk_context *ctx, struct nk_buffer *cmds,
1180 struct nk_buffer *vertices, struct nk_buffer *elements,
1181 const struct nk_convert_config *config)
1182 {
1183 nk_flags res = NK_CONVERT_SUCCESS;
1184 const struct nk_command *cmd;
1185 NK_ASSERT(ctx);
1186 NK_ASSERT(cmds);
1187 NK_ASSERT(vertices);
1188 NK_ASSERT(elements);
1189 NK_ASSERT(config);
1190 NK_ASSERT(config->vertex_layout);
1191 NK_ASSERT(config->vertex_size);
1192 if (!ctx || !cmds || !vertices || !elements || !config || !config->vertex_layout)
1193 return NK_CONVERT_INVALID_PARAM;
1194
1195 nk_draw_list_setup(&ctx->draw_list, config, cmds, vertices, elements,
1196 config->line_AA, config->shape_AA);
1197 nk_foreach(cmd, ctx)
1198 {
1199 #ifdef NK_INCLUDE_COMMAND_USERDATA
1200 ctx->draw_list.userdata = cmd->userdata;
1201 #endif
1202 switch (cmd->type) {
1203 case NK_COMMAND_NOP: break;
1204 case NK_COMMAND_SCISSOR: {
1205 const struct nk_command_scissor *s = (const struct nk_command_scissor*)cmd;
1206 nk_draw_list_add_clip(&ctx->draw_list, nk_rect(s->x, s->y, s->w, s->h));
1207 } break;
1208 case NK_COMMAND_LINE: {
1209 const struct nk_command_line *l = (const struct nk_command_line*)cmd;
1210 nk_draw_list_stroke_line(&ctx->draw_list, nk_vec2(l->begin.x, l->begin.y),
1211 nk_vec2(l->end.x, l->end.y), l->color, l->line_thickness);
1212 } break;
1213 case NK_COMMAND_CURVE: {
1214 const struct nk_command_curve *q = (const struct nk_command_curve*)cmd;
1215 nk_draw_list_stroke_curve(&ctx->draw_list, nk_vec2(q->begin.x, q->begin.y),
1216 nk_vec2(q->ctrl[0].x, q->ctrl[0].y), nk_vec2(q->ctrl[1].x,
1217 q->ctrl[1].y), nk_vec2(q->end.x, q->end.y), q->color,
1218 config->curve_segment_count, q->line_thickness);
1219 } break;
1220 case NK_COMMAND_RECT: {
1221 const struct nk_command_rect *r = (const struct nk_command_rect*)cmd;
1222 nk_draw_list_stroke_rect(&ctx->draw_list, nk_rect(r->x, r->y, r->w, r->h),
1223 r->color, (float)r->rounding, r->line_thickness);
1224 } break;
1225 case NK_COMMAND_RECT_FILLED: {
1226 const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled*)cmd;
1227 nk_draw_list_fill_rect(&ctx->draw_list, nk_rect(r->x, r->y, r->w, r->h),
1228 r->color, (float)r->rounding);
1229 } break;
1230 case NK_COMMAND_RECT_MULTI_COLOR: {
1231 const struct nk_command_rect_multi_color *r = (const struct nk_command_rect_multi_color*)cmd;
1232 nk_draw_list_fill_rect_multi_color(&ctx->draw_list, nk_rect(r->x, r->y, r->w, r->h),
1233 r->left, r->top, r->right, r->bottom);
1234 } break;
1235 case NK_COMMAND_CIRCLE: {
1236 const struct nk_command_circle *c = (const struct nk_command_circle*)cmd;
1237 nk_draw_list_stroke_circle(&ctx->draw_list, nk_vec2((float)c->x + (float)c->w/2,
1238 (float)c->y + (float)c->h/2), (float)c->w/2, c->color,
1239 config->circle_segment_count, c->line_thickness);
1240 } break;
1241 case NK_COMMAND_CIRCLE_FILLED: {
1242 const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
1243 nk_draw_list_fill_circle(&ctx->draw_list, nk_vec2((float)c->x + (float)c->w/2,
1244 (float)c->y + (float)c->h/2), (float)c->w/2, c->color,
1245 config->circle_segment_count);
1246 } break;
1247 case NK_COMMAND_ARC: {
1248 const struct nk_command_arc *c = (const struct nk_command_arc*)cmd;
1249 nk_draw_list_path_line_to(&ctx->draw_list, nk_vec2(c->cx, c->cy));
1250 nk_draw_list_path_arc_to(&ctx->draw_list, nk_vec2(c->cx, c->cy), c->r,
1251 c->a[0], c->a[1], config->arc_segment_count);
1252 nk_draw_list_path_stroke(&ctx->draw_list, c->color, NK_STROKE_CLOSED, c->line_thickness);
1253 } break;
1254 case NK_COMMAND_ARC_FILLED: {
1255 const struct nk_command_arc_filled *c = (const struct nk_command_arc_filled*)cmd;
1256 nk_draw_list_path_line_to(&ctx->draw_list, nk_vec2(c->cx, c->cy));
1257 nk_draw_list_path_arc_to(&ctx->draw_list, nk_vec2(c->cx, c->cy), c->r,
1258 c->a[0], c->a[1], config->arc_segment_count);
1259 nk_draw_list_path_fill(&ctx->draw_list, c->color);
1260 } break;
1261 case NK_COMMAND_TRIANGLE: {
1262 const struct nk_command_triangle *t = (const struct nk_command_triangle*)cmd;
1263 nk_draw_list_stroke_triangle(&ctx->draw_list, nk_vec2(t->a.x, t->a.y),
1264 nk_vec2(t->b.x, t->b.y), nk_vec2(t->c.x, t->c.y), t->color,
1265 t->line_thickness);
1266 } break;
1267 case NK_COMMAND_TRIANGLE_FILLED: {
1268 const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled*)cmd;
1269 nk_draw_list_fill_triangle(&ctx->draw_list, nk_vec2(t->a.x, t->a.y),
1270 nk_vec2(t->b.x, t->b.y), nk_vec2(t->c.x, t->c.y), t->color);
1271 } break;
1272 case NK_COMMAND_POLYGON: {
1273 int i;
1274 const struct nk_command_polygon*p = (const struct nk_command_polygon*)cmd;
1275 for (i = 0; i < p->point_count; ++i) {
1276 struct nk_vec2 pnt = nk_vec2((float)p->points[i].x, (float)p->points[i].y);
1277 nk_draw_list_path_line_to(&ctx->draw_list, pnt);
1278 }
1279 nk_draw_list_path_stroke(&ctx->draw_list, p->color, NK_STROKE_CLOSED, p->line_thickness);
1280 } break;
1281 case NK_COMMAND_POLYGON_FILLED: {
1282 int i;
1283 const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled*)cmd;
1284 for (i = 0; i < p->point_count; ++i) {
1285 struct nk_vec2 pnt = nk_vec2((float)p->points[i].x, (float)p->points[i].y);
1286 nk_draw_list_path_line_to(&ctx->draw_list, pnt);
1287 }
1288 nk_draw_list_path_fill(&ctx->draw_list, p->color);
1289 } break;
1290 case NK_COMMAND_POLYLINE: {
1291 int i;
1292 const struct nk_command_polyline *p = (const struct nk_command_polyline*)cmd;
1293 for (i = 0; i < p->point_count; ++i) {
1294 struct nk_vec2 pnt = nk_vec2((float)p->points[i].x, (float)p->points[i].y);
1295 nk_draw_list_path_line_to(&ctx->draw_list, pnt);
1296 }
1297 nk_draw_list_path_stroke(&ctx->draw_list, p->color, NK_STROKE_OPEN, p->line_thickness);
1298 } break;
1299 case NK_COMMAND_TEXT: {
1300 const struct nk_command_text *t = (const struct nk_command_text*)cmd;
1301 nk_draw_list_add_text(&ctx->draw_list, t->font, nk_rect(t->x, t->y, t->w, t->h),
1302 t->string, t->length, t->height, t->foreground);
1303 } break;
1304 case NK_COMMAND_IMAGE: {
1305 const struct nk_command_image *i = (const struct nk_command_image*)cmd;
1306 nk_draw_list_add_image(&ctx->draw_list, i->img, nk_rect(i->x, i->y, i->w, i->h), i->col);
1307 } break;
1308 case NK_COMMAND_CUSTOM: {
1309 const struct nk_command_custom *c = (const struct nk_command_custom*)cmd;
1310 c->callback(&ctx->draw_list, c->x, c->y, c->w, c->h, c->callback_data);
1311 } break;
1312 default: break;
1313 }
1314 }
1315 res |= (cmds->needed > cmds->allocated + (cmds->memory.size - cmds->size)) ? NK_CONVERT_COMMAND_BUFFER_FULL: 0;
1316 res |= (vertices->needed > vertices->allocated) ? NK_CONVERT_VERTEX_BUFFER_FULL: 0;
1317 res |= (elements->needed > elements->allocated) ? NK_CONVERT_ELEMENT_BUFFER_FULL: 0;
1318 return res;
1319 }
1320 NK_API const struct nk_draw_command*
nk__draw_begin(const struct nk_context * ctx,const struct nk_buffer * buffer)1321 nk__draw_begin(const struct nk_context *ctx,
1322 const struct nk_buffer *buffer)
1323 {
1324 return nk__draw_list_begin(&ctx->draw_list, buffer);
1325 }
1326 NK_API const struct nk_draw_command*
nk__draw_end(const struct nk_context * ctx,const struct nk_buffer * buffer)1327 nk__draw_end(const struct nk_context *ctx, const struct nk_buffer *buffer)
1328 {
1329 return nk__draw_list_end(&ctx->draw_list, buffer);
1330 }
1331 NK_API const struct nk_draw_command*
nk__draw_next(const struct nk_draw_command * cmd,const struct nk_buffer * buffer,const struct nk_context * ctx)1332 nk__draw_next(const struct nk_draw_command *cmd,
1333 const struct nk_buffer *buffer, const struct nk_context *ctx)
1334 {
1335 return nk__draw_list_next(cmd, buffer, &ctx->draw_list);
1336 }
1337 #endif
1338
1339