/
mojoshader_metal.c
688 lines (586 loc) · 20.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
/**
* MojoShader; generate shader programs from bytecode of compiled
* Direct3D shaders.
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Ryan C. Gordon.
*/
#if (defined(__APPLE__) && defined(__MACH__))
#define PLATFORM_APPLE 1
#include "TargetConditionals.h"
#include <objc/message.h>
14
15
16
17
18
#define msg ((void* (*)(void*, void*))objc_msgSend)
#define msg_s ((void* (*)(void*, void*, const char*))objc_msgSend)
#define msg_p ((void* (*)(void*, void*, void*))objc_msgSend)
#define msg_ip ((void* (*)(void*, void*, int, void*))objc_msgSend)
#define msg_ppp ((void* (*)(void*, void*, void*, void*, void*))objc_msgSend)
19
20
21
22
23
24
25
26
27
28
#endif /* (defined(__APPLE__) && defined(__MACH__)) */
#define __MOJOSHADER_INTERNAL__ 1
#include "mojoshader_internal.h"
typedef struct MOJOSHADER_mtlUniformBuffer MOJOSHADER_mtlUniformBuffer;
typedef struct MOJOSHADER_mtlShader
{
const MOJOSHADER_parseData *parseData;
MOJOSHADER_mtlUniformBuffer *ubo;
29
uint32 refcount;
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
void *library; // MTLLibrary*
} MOJOSHADER_mtlShader;
// Error state...
static char error_buffer[1024] = { '\0' };
static void set_error(const char *str)
{
snprintf(error_buffer, sizeof (error_buffer), "%s", str);
} // set_error
static inline void out_of_memory(void)
{
set_error("out of memory");
} // out_of_memory
// profile-specific implementations...
#if SUPPORT_PROFILE_METAL && PLATFORM_APPLE
#ifdef MOJOSHADER_EFFECT_SUPPORT
/* Structs */
typedef struct MOJOSHADER_mtlUniformBuffer
{
int bufferSize;
void **internalBuffers; // MTLBuffer*
int internalBufferSize;
int internalOffset;
int currentFrame;
60
int inUse;
61
62
63
64
65
66
67
} MOJOSHADER_mtlUniformBuffer;
// Max entries for each register file type...
#define MAX_REG_FILE_F 8192
#define MAX_REG_FILE_I 2047
#define MAX_REG_FILE_B 2047
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
typedef struct MOJOSHADER_mtlContext
{
// Allocators...
MOJOSHADER_malloc malloc_fn;
MOJOSHADER_free free_fn;
void *malloc_data;
// The constant register files...
// !!! FIXME: Man, it kills me how much memory this takes...
// !!! FIXME: ... make this dynamically allocated on demand.
float vs_reg_file_f[MAX_REG_FILE_F * 4];
int vs_reg_file_i[MAX_REG_FILE_I * 4];
uint8 vs_reg_file_b[MAX_REG_FILE_B];
float ps_reg_file_f[MAX_REG_FILE_F * 4];
int ps_reg_file_i[MAX_REG_FILE_I * 4];
uint8 ps_reg_file_b[MAX_REG_FILE_B];
// Pointer to the active MTLDevice.
void* device;
// The maximum number of frames in flight.
int framesInFlight;
// Array of UBOs that are being used in the current frame.
MOJOSHADER_mtlUniformBuffer **buffersInUse;
// The current capacity of the uniform buffer array.
int bufferArrayCapacity;
// The actual number of UBOs used in the current frame.
int numBuffersInUse;
// The currently bound shaders.
MOJOSHADER_mtlShader *vertexShader;
MOJOSHADER_mtlShader *pixelShader;
// Objective-C Selectors
void* classNSString;
void* selAlloc;
void* selInitWithUTF8String;
void* selUTF8String;
void* selLength;
void* selContents;
void* selNewBufferWithLength;
void* selRelease;
void* selNewLibraryWithSource;
void* selLocalizedDescription;
void* selNewFunctionWithName;
void* selRetain;
} MOJOSHADER_mtlContext;
static MOJOSHADER_mtlContext *ctx = NULL;
120
121
122
123
124
125
126
127
128
129
130
131
132
133
/* Uniform buffer utilities */
static inline int next_highest_alignment(int n)
{
#if TARGET_OS_IOS || TARGET_OS_TV || TARGET_OS_SIMULATOR
int align = 16;
#else
int align = 256;
#endif
return align * ((n + align - 1) / align);
} // next_highest_alignment
134
135
static void* create_ubo_backing_buffer(MOJOSHADER_mtlUniformBuffer *ubo,
int frame)
136
{
137
void *oldBuffer = ubo->internalBuffers[frame];
138
void *newBuffer = msg_ip(
139
140
ctx->device,
ctx->selNewBufferWithLength,
141
142
143
144
145
146
147
ubo->internalBufferSize,
NULL
);
if (oldBuffer != NULL)
{
// Copy over data from old buffer
memcpy(
148
149
150
msg(newBuffer, ctx->selContents),
msg(oldBuffer, ctx->selContents),
(int) msg(oldBuffer, ctx->selLength)
151
152
153
);
// Free the old buffer
154
msg(oldBuffer, ctx->selRelease);
155
156
157
} //if
return newBuffer;
158
} // create_ubo_backing_buffer
159
160
static void predraw_ubo(MOJOSHADER_mtlUniformBuffer *ubo)
161
{
162
if (!ubo->inUse)
163
{
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
ubo->inUse = 1;
ctx->buffersInUse[ctx->numBuffersInUse++] = ubo;
// Double the array size if we run out of room
if (ctx->numBuffersInUse >= ctx->bufferArrayCapacity)
{
int oldlen = ctx->bufferArrayCapacity;
ctx->bufferArrayCapacity *= 2;
MOJOSHADER_mtlUniformBuffer **tmp;
tmp = (MOJOSHADER_mtlUniformBuffer**) ctx->malloc_fn(
ctx->bufferArrayCapacity * sizeof(MOJOSHADER_mtlUniformBuffer *),
ctx->malloc_data
);
memcpy(tmp, ctx->buffersInUse, oldlen * sizeof(MOJOSHADER_mtlUniformBuffer *));
ctx->free_fn(ctx->buffersInUse, ctx->malloc_data);
ctx->buffersInUse = tmp;
}
181
182
183
184
185
return;
} // if
ubo->internalOffset += ubo->bufferSize;
186
187
188
189
int buflen = (int) msg(
ubo->internalBuffers[ubo->currentFrame],
ctx->selLength
);
190
191
192
193
194
195
196
if (ubo->internalOffset >= buflen)
{
// Double capacity when we're out of room
if (ubo->internalOffset >= ubo->internalBufferSize)
ubo->internalBufferSize *= 2;
ubo->internalBuffers[ubo->currentFrame] =
197
create_ubo_backing_buffer(ubo, ubo->currentFrame);
198
} //if
199
} // predraw_ubo
200
201
202
static MOJOSHADER_mtlUniformBuffer* create_ubo(MOJOSHADER_mtlShader *shader,
MOJOSHADER_malloc m, void* d)
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
{
int uniformCount = shader->parseData->uniform_count;
if (uniformCount == 0)
return NULL;
// Calculate how big we need to make the buffer
int buflen = 0;
for (int i = 0; i < uniformCount; i += 1)
{
int arrayCount = shader->parseData->uniforms[i].array_count;
int uniformSize = 16;
if (shader->parseData->uniforms[i].type == MOJOSHADER_UNIFORM_BOOL)
uniformSize = 1;
buflen += (arrayCount ? arrayCount : 1) * uniformSize;
} // for
219
220
221
222
223
224
225
226
227
228
229
230
// Allocate the UBO
MOJOSHADER_mtlUniformBuffer *retval;
retval = (MOJOSHADER_mtlUniformBuffer *) m(sizeof(MOJOSHADER_mtlUniformBuffer), d);
retval->bufferSize = next_highest_alignment(buflen);
retval->internalBufferSize = retval->bufferSize * 16; // pre-allocate some extra room!
retval->internalBuffers = m(ctx->framesInFlight * sizeof(void*), d);
retval->internalOffset = 0;
retval->inUse = 0;
retval->currentFrame = 0;
// Create the backing buffers
for (int i = 0; i < ctx->framesInFlight; i++)
231
{
232
233
retval->internalBuffers[i] = NULL; // basically a memset('\0')
retval->internalBuffers[i] = create_ubo_backing_buffer(retval, i);
234
235
} // for
236
return retval;
237
238
239
240
241
242
243
244
245
} // create_ubo
static void dealloc_ubo(MOJOSHADER_mtlShader *shader,
MOJOSHADER_free f,
void* d)
{
if (shader->ubo == NULL)
return;
246
for (int i = 0; i < ctx->framesInFlight; i++)
247
{
248
msg(shader->ubo->internalBuffers[i], ctx->selRelease);
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
shader->ubo->internalBuffers[i] = NULL;
} // for
f(shader->ubo->internalBuffers, d);
f(shader->ubo, d);
} // dealloc_ubo
static void *get_uniform_buffer(MOJOSHADER_mtlShader *shader)
{
if (shader == NULL || shader->ubo == NULL)
return NULL;
return shader->ubo->internalBuffers[shader->ubo->currentFrame];
} // get_uniform_buffer
static int get_uniform_offset(MOJOSHADER_mtlShader *shader)
{
if (shader == NULL || shader->ubo == NULL)
return 0;
return shader->ubo->internalOffset;
} // get_uniform_offset
static void update_uniform_buffer(MOJOSHADER_mtlShader *shader)
{
if (shader == NULL || shader->ubo == NULL)
return;
float *regF; int *regI; uint8 *regB;
if (shader->parseData->shader_type == MOJOSHADER_TYPE_VERTEX)
{
280
281
282
regF = ctx->vs_reg_file_f;
regI = ctx->vs_reg_file_i;
regB = ctx->vs_reg_file_b;
283
284
285
} // if
else
{
286
287
288
regF = ctx->ps_reg_file_f;
regI = ctx->ps_reg_file_i;
regB = ctx->ps_reg_file_b;
289
290
} // else
291
predraw_ubo(shader->ubo);
292
void *buf = shader->ubo->internalBuffers[shader->ubo->currentFrame];
293
void *contents = msg(buf, ctx->selContents) + shader->ubo->internalOffset;
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
int offset = 0;
for (int i = 0; i < shader->parseData->uniform_count; i++)
{
int idx = shader->parseData->uniforms[i].index;
int arrayCount = shader->parseData->uniforms[i].array_count;
int size = arrayCount ? arrayCount : 1;
switch (shader->parseData->uniforms[i].type)
{
case MOJOSHADER_UNIFORM_FLOAT:
memcpy(
contents + (offset * 16),
®F[4 * idx],
size * 16
);
break;
case MOJOSHADER_UNIFORM_INT:
// !!! FIXME: Need a test case
memcpy(
contents + (offset * 16),
®I[4 * idx],
size * 16
);
break;
case MOJOSHADER_UNIFORM_BOOL:
// !!! FIXME: Need a test case
memcpy(
contents + offset,
®B[idx],
size
);
break;
default:
assert(0); // This should never happen.
break;
} // switch
offset += size;
} // for
} // update_uniform_buffer
/* Public API */
341
342
343
int MOJOSHADER_mtlCreateContext(void* mtlDevice, int framesInFlight,
MOJOSHADER_malloc m, MOJOSHADER_free f,
void *malloc_d)
344
{
345
346
347
348
349
350
351
assert(ctx == NULL);
if (m == NULL) m = MOJOSHADER_internal_malloc;
if (f == NULL) f = MOJOSHADER_internal_free;
ctx = (MOJOSHADER_mtlContext *) m(sizeof(MOJOSHADER_mtlContext), malloc_d);
if (ctx == NULL)
352
353
{
out_of_memory();
354
goto init_fail;
355
} // if
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
memset(ctx, '\0', sizeof (MOJOSHADER_mtlContext));
ctx->malloc_fn = m;
ctx->free_fn = f;
ctx->malloc_data = malloc_d;
// Initialize the Metal state
ctx->device = mtlDevice;
ctx->framesInFlight = framesInFlight;
// Allocate the uniform buffer object array
ctx->bufferArrayCapacity = 32; // arbitrary!
ctx->buffersInUse = ctx->malloc_fn(
ctx->bufferArrayCapacity * sizeof(MOJOSHADER_mtlUniformBuffer *),
ctx->malloc_data
);
// Grab references to Objective-C selectors
ctx->classNSString = objc_getClass("NSString");
ctx->selAlloc = sel_registerName("alloc");
ctx->selInitWithUTF8String = sel_registerName("initWithUTF8String:");
ctx->selUTF8String = sel_registerName("UTF8String");
ctx->selLength = sel_registerName("length");
ctx->selContents = sel_registerName("contents");
ctx->selNewBufferWithLength = sel_registerName("newBufferWithLength:options:");
ctx->selRelease = sel_registerName("release");
ctx->selNewLibraryWithSource = sel_registerName("newLibraryWithSource:options:error:");
ctx->selLocalizedDescription = sel_registerName("localizedDescription");
ctx->selNewFunctionWithName = sel_registerName("newFunctionWithName:");
ctx->selRetain = sel_registerName("retain");
return 0;
init_fail:
if (ctx != NULL)
f(ctx, malloc_d);
return -1;
} // MOJOSHADER_mtlCreateContext
void MOJOSHADER_mtlDestroyContext(void)
{
ctx->free_fn(ctx->buffersInUse, ctx->malloc_data);
ctx->free_fn(ctx, ctx->malloc_data);
399
ctx = NULL;
400
401
402
403
404
405
406
407
408
409
410
411
412
413
} // MOJOSHADER_mtlDestroyContext
void *MOJOSHADER_mtlCompileLibrary(MOJOSHADER_effect *effect)
{
MOJOSHADER_malloc m = ctx->malloc_fn;
MOJOSHADER_free f = ctx->free_fn;
void *d = ctx->malloc_data;
int i, src_len, src_pos, output_len;
char *shader_source, *ptr;
const char *repl;
MOJOSHADER_effectObject *object;
MOJOSHADER_mtlShader *shader;
void *retval, *compileError, *shader_source_ns;
414
415
// Count the number of shaders before allocating
416
src_len = 0;
417
418
for (i = 0; i < effect->object_count; i++)
{
419
object = &effect->objects[i];
420
421
422
if (object->type == MOJOSHADER_SYMTYPE_PIXELSHADER
|| object->type == MOJOSHADER_SYMTYPE_VERTEXSHADER)
{
423
if (!object->shader.is_preshader)
424
{
425
426
427
shader = (MOJOSHADER_mtlShader*) object->shader.shader;
src_len += shader->parseData->output_len;
} // if
428
429
430
} // if
} // for
431
432
// Allocate shader source buffer
shader_source = (char *) m(src_len + 1, d);
433
memset(shader_source, '\0', src_len + 1);
434
src_pos = 0;
435
436
437
438
// Copy all the source text into the buffer
for (i = 0; i < effect->object_count; i++)
{
439
object = &effect->objects[i];
440
441
442
443
444
if (object->type == MOJOSHADER_SYMTYPE_PIXELSHADER
|| object->type == MOJOSHADER_SYMTYPE_VERTEXSHADER)
{
if (!object->shader.is_preshader)
{
445
446
447
448
shader = (MOJOSHADER_mtlShader*) object->shader.shader;
memcpy(&shader_source[src_pos], shader->parseData->output,
shader->parseData->output_len);
src_pos += shader->parseData->output_len;
449
450
451
452
453
454
455
456
457
} // if
} // if
} // for
// Handle texcoord0 -> point_coord conversion
if (strstr(shader_source, "[[point_size]]"))
{
// !!! FIXME: This assumes all texcoord0 attributes in the effect are
// !!! FIXME: actually point coords! It ain't necessarily so! -caleb
458
repl = "[[ point_coord ]]";
459
460
461
462
while ((ptr = strstr(shader_source, "[[user(texcoord0)]]")))
{
memcpy(ptr, repl, strlen(repl));
463
// "float4" -> "float2"
464
465
466
467
468
469
470
471
472
int spaces = 0;
while (spaces < 2)
if (*(ptr--) == ' ')
spaces++;
memcpy(ptr, "2", sizeof(char));
} // while
} // if
// Compile the source into a library
473
474
475
476
477
compileError = NULL;
shader_source_ns = msg_s(
msg(ctx->classNSString, ctx->selAlloc),
ctx->selInitWithUTF8String,
shader_source
478
);
479
480
retval = msg_ppp(ctx->device, ctx->selNewLibraryWithSource,
shader_source_ns, NULL, &compileError);
481
f(shader_source, d);
482
msg(shader_source_ns, ctx->selRelease);
483
484
if (retval == NULL)
485
{
486
487
488
compileError = msg(compileError, ctx->selLocalizedDescription);
set_error((char*) msg(compileError, ctx->selUTF8String));
return NULL;
489
490
} // if
491
// Run through the shaders again, setting the library reference
492
493
for (i = 0; i < effect->object_count; i++)
{
494
object = &effect->objects[i];
495
496
497
498
499
500
if (object->type == MOJOSHADER_SYMTYPE_PIXELSHADER
|| object->type == MOJOSHADER_SYMTYPE_VERTEXSHADER)
{
if (object->shader.is_preshader)
continue;
501
((MOJOSHADER_mtlShader*) object->shader.shader)->library = retval;
502
503
504
505
} // if
} // for
return retval;
506
} // MOJOSHADER_mtlCompileLibrary
507
508
void MOJOSHADER_mtlDeleteLibrary(void *library)
509
{
510
511
msg(library, ctx->selRelease);
} // MOJOSHADER_mtlDeleteLibrary
512
513
514
515
516
517
518
519
MOJOSHADER_mtlShader *MOJOSHADER_mtlCompileShader(const char *mainfn,
const unsigned char *tokenbuf,
const unsigned int bufsize,
const MOJOSHADER_swizzle *swiz,
const unsigned int swizcount,
const MOJOSHADER_samplerMap *smap,
const unsigned int smapcount)
520
{
521
522
523
MOJOSHADER_malloc m = ctx->malloc_fn;
MOJOSHADER_free f = ctx->free_fn;
void *d = ctx->malloc_data;
524
525
526
527
528
const MOJOSHADER_parseData *pd = MOJOSHADER_parse("metal", mainfn, tokenbuf,
bufsize, swiz, swizcount,
smap, smapcount, m, f, d);
if (pd->error_count > 0)
529
{
530
531
532
533
// !!! FIXME: put multiple errors in the buffer? Don't use
// !!! FIXME: MOJOSHADER_mtlGetError() for this?
set_error(pd->errors[0].error);
goto compile_shader_fail;
534
535
} // if
536
537
538
MOJOSHADER_mtlShader *retval = (MOJOSHADER_mtlShader *) m(sizeof(MOJOSHADER_mtlShader), d);
if (retval == NULL)
goto compile_shader_fail;
539
540
541
542
543
retval->parseData = pd;
retval->refcount = 1;
retval->ubo = create_ubo(retval, m, d);
retval->library = NULL; // populated by MOJOSHADER_mtlCompileLibrary
544
545
return retval;
546
547
548
549
550
551
compile_shader_fail:
MOJOSHADER_freeParseData(retval->parseData);
f(retval, d);
return NULL;
} // MOJOSHADER_mtlCompileShader
552
553
554
555
556
557
void MOJOSHADER_mtlShaderAddRef(MOJOSHADER_mtlShader *shader)
{
if (shader != NULL)
shader->refcount++;
} // MOJOSHADER_mtlShaderAddRef
558
559
void MOJOSHADER_mtlDeleteShader(MOJOSHADER_mtlShader *shader)
560
{
561
if (shader != NULL)
562
{
563
564
565
if (shader->refcount > 1)
shader->refcount--;
else
566
{
567
dealloc_ubo(shader, ctx->free_fn, ctx->malloc_data);
568
MOJOSHADER_freeParseData(shader->parseData);
569
570
ctx->free_fn(shader, ctx->malloc_data);
} // else
571
} // if
572
} // MOJOSHADER_mtlDeleteShader
573
574
575
576
577
578
const MOJOSHADER_parseData *MOJOSHADER_mtlGetShaderParseData(
MOJOSHADER_mtlShader *shader)
{
return (shader != NULL) ? shader->parseData : NULL;
} // MOJOSHADER_mtlGetParseData
579
580
581
582
583
584
585
void MOJOSHADER_mtlBindShaders(MOJOSHADER_mtlShader *vshader,
MOJOSHADER_mtlShader *pshader)
{
// Use the last bound shaders in case of NULL
if (vshader != NULL)
ctx->vertexShader = vshader;
586
587
588
589
if (pshader != NULL)
ctx->pixelShader = pshader;
} // MOJOSHADER_mtlBindShaders
590
591
592
void MOJOSHADER_mtlGetBoundShaders(MOJOSHADER_mtlShader **vshader,
MOJOSHADER_mtlShader **pshader)
593
{
594
595
596
*vshader = ctx->vertexShader;
*pshader = ctx->pixelShader;
} // MOJOSHADER_mtlGetBoundShaders
597
598
599
600
601
602
603
604
605
606
607
void MOJOSHADER_mtlMapUniformBufferMemory(float **vsf, int **vsi, unsigned char **vsb,
float **psf, int **psi, unsigned char **psb)
{
*vsf = ctx->vs_reg_file_f;
*vsi = ctx->vs_reg_file_i;
*vsb = ctx->vs_reg_file_b;
*psf = ctx->ps_reg_file_f;
*psi = ctx->ps_reg_file_i;
*psb = ctx->ps_reg_file_b;
} // MOJOSHADER_mtlMapUniformBufferMemory
608
609
void MOJOSHADER_mtlUnmapUniformBufferMemory()
610
{
611
612
613
614
615
616
617
/* This has nothing to do with unmapping memory
* and everything to do with updating uniform
* buffers with the latest parameter contents.
*/
update_uniform_buffer(ctx->vertexShader);
update_uniform_buffer(ctx->pixelShader);
} // MOJOSHADER_mtlUnmapUniformBufferMemory
618
619
620
621
622
623
624
625
626
void MOJOSHADER_mtlGetUniformBuffers(void **vbuf, int *voff,
void **pbuf, int *poff)
{
*vbuf = get_uniform_buffer(ctx->vertexShader);
*voff = get_uniform_offset(ctx->vertexShader);
*pbuf = get_uniform_buffer(ctx->pixelShader);
*poff = get_uniform_offset(ctx->pixelShader);
} // MOJOSHADER_mtlGetUniformBuffers
627
628
629
630
631
632
void *MOJOSHADER_mtlGetFunctionHandle(MOJOSHADER_mtlShader *shader)
{
if (shader == NULL)
return NULL;
633
634
635
636
637
void *fnname = msg_s(
msg(ctx->classNSString, ctx->selAlloc),
ctx->selInitWithUTF8String,
shader->parseData->mainfn
);
638
void *ret = msg_p(
639
shader->library,
640
ctx->selNewFunctionWithName,
641
642
fnname
);
643
644
msg(fnname, ctx->selRelease);
msg(ret, ctx->selRetain);
645
646
647
648
649
650
return ret;
} // MOJOSHADER_mtlGetFunctionHandle
void MOJOSHADER_mtlEndFrame()
{
651
for (int i = 0; i < ctx->numBuffersInUse; i += 1)
652
{
653
654
655
656
657
658
MOJOSHADER_mtlUniformBuffer *buf = ctx->buffersInUse[i];
buf->internalOffset = 0;
buf->currentFrame = (buf->currentFrame + 1) % ctx->framesInFlight;
buf->inUse = 0;
} // for
ctx->numBuffersInUse = 0;
659
660
661
662
663
664
665
666
667
668
} // MOJOSHADER_mtlEndFrame
int MOJOSHADER_mtlGetVertexAttribLocation(MOJOSHADER_mtlShader *vert,
MOJOSHADER_usage usage, int index)
{
if (vert == NULL)
return -1;
for (int i = 0; i < vert->parseData->attribute_count; i++)
{
669
670
if (vert->parseData->attributes[i].usage == usage &&
vert->parseData->attributes[i].index == index)
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
{
return i;
} // if
} // for
// failure, couldn't find requested attribute
return -1;
} // MOJOSHADER_mtlGetVertexAttribLocation
const char *MOJOSHADER_mtlGetError(void)
{
return error_buffer;
} // MOJOSHADER_mtlGetError
#endif /* MOJOSHADER_EFFECT_SUPPORT */
#endif /* SUPPORT_PROFILE_METAL && PLATFORM_APPLE */
// end of mojoshader_metal.c ...