/
vertex_array_object.rs
615 lines (546 loc) · 24.6 KB
/
vertex_array_object.rs
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
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
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
use std::borrow::Borrow;
use std::cell::{Cell, RefCell};
use std::collections::HashMap;
use std::mem;
use smallvec::SmallVec;
use crate::Handle;
use crate::buffer::BufferAnySlice;
use crate::program::Program;
use crate::vertex::AttributeType;
use crate::vertex::VertexFormat;
use crate::GlObject;
use crate::BufferExt;
use crate::gl;
use crate::context::CommandContext;
use crate::version::Api;
use crate::version::Version;
/// Stores and handles vertex attributes.
pub struct VertexAttributesSystem {
// we maintain a list of VAOs for each vertexbuffer-indexbuffer-program association
// the key is a (buffers-list-with-offset, program) ; the buffers list must be sorted
vaos: RefCell<HashMap<(Vec<(gl::types::GLuint, usize)>, Handle), VertexArrayObject>>,
}
/// Object allowing one to bind vertex attributes to the current context.
pub struct Binder<'a, 'b, 'c> {
context: &'b mut CommandContext<'c>,
program: &'a Program,
element_array_buffer: Option<BufferAnySlice<'a>>,
vertex_buffers: SmallVec<[(gl::types::GLuint, VertexFormat, usize, usize, Option<u32>); 2]>,
base_vertex: bool,
}
impl VertexAttributesSystem {
/// Builds a new `VertexAttributesSystem`.
#[inline]
pub fn new() -> VertexAttributesSystem {
VertexAttributesSystem {
vaos: RefCell::new(HashMap::with_hasher(Default::default())),
}
}
/// Starts the process of binding vertex attributes.
///
/// `base_vertex` should be set to true if the backend supports the `glDraw*BaseVertex`
/// functions. If `base_vertex` is true, then `bind` will return the base vertex to use.
#[inline]
pub fn start<'a, 'b, 'c: 'b>(ctxt: &'b mut CommandContext<'c>, program: &'a Program,
indices: Option<BufferAnySlice<'a>>, base_vertex: bool)
-> Binder<'a, 'b, 'c>
{
if let Some(indices) = indices {
indices.prepare_for_element_array(ctxt);
}
Binder {
context: ctxt,
program,
element_array_buffer: indices,
vertex_buffers: SmallVec::new(),
base_vertex,
}
}
/// This function *must* be called whenever you destroy a buffer so that the system can
/// purge its VAOs cache.
#[inline]
pub fn purge_buffer(ctxt: &mut CommandContext<'_>, id: gl::types::GLuint) {
VertexAttributesSystem::purge_if(ctxt, |&(ref buffers, _)| {
buffers.iter().any(|&(b, _)| b == id)
})
}
/// This function *must* be called whenever you destroy a program so that the system can
/// purge its VAOs cache.
#[inline]
pub fn purge_program(ctxt: &mut CommandContext<'_>, program: Handle) {
VertexAttributesSystem::purge_if(ctxt, |&(_, p)| p == program)
}
/// Purges the VAOs cache.
pub fn purge_all(ctxt: &mut CommandContext<'_>) {
let vaos = mem::replace(&mut *ctxt.vertex_array_objects.vaos.borrow_mut(),
HashMap::with_hasher(Default::default()));
for (_, vao) in vaos {
vao.destroy(ctxt);
}
}
/// Purges the VAOs cache. Contrary to `purge_all`, this function expects the system to be
/// destroyed soon.
pub fn cleanup(ctxt: &mut CommandContext<'_>) {
let vaos = mem::replace(&mut *ctxt.vertex_array_objects.vaos.borrow_mut(),
HashMap::with_hasher(Default::default()));
for (_, vao) in vaos {
vao.destroy(ctxt);
}
}
/// Tells the VAOs system that the currently bound element array buffer will change.
pub fn hijack_current_element_array_buffer(ctxt: &mut CommandContext<'_>) {
let vaos = ctxt.vertex_array_objects.vaos.borrow_mut();
for (_, vao) in vaos.iter() {
if vao.id == ctxt.state.vertex_array {
vao.element_array_buffer_hijacked.set(true);
return;
}
}
}
/// Purges VAOs that match a certain condition.
fn purge_if<F>(ctxt: &mut CommandContext<'_>, mut condition: F)
where F: FnMut(&(Vec<(gl::types::GLuint, usize)>, Handle)) -> bool
{
let mut vaos = ctxt.vertex_array_objects.vaos.borrow_mut();
let mut keys = Vec::with_capacity(4);
for key in (*vaos).keys() {
if condition(key) {
keys.push(key.clone());
}
}
for key in keys {
vaos.remove(&key).unwrap().destroy(ctxt);
}
}
}
impl<'a, 'b, 'c> Binder<'a, 'b, 'c> {
/// Adds a buffer to bind as a source of vertices.
///
/// # Parameters
///
/// - `buffer`: The buffer to bind.
/// - `first`: Offset of the first element of the buffer in number of elements.
/// - `divisor`: If `Some`, use this value for `glVertexAttribDivisor` (instancing-related).
#[inline]
pub fn add(mut self, buffer: &BufferAnySlice<'_>, bindings: &VertexFormat, divisor: Option<u32>)
-> Binder<'a, 'b, 'c>
{
let offset = buffer.get_offset_bytes();
buffer.prepare_for_vertex_attrib_array(self.context);
let (buffer, format, stride) = (buffer.get_id(), bindings.clone(),
buffer.get_elements_size());
self.vertex_buffers.push((buffer, format, offset, stride, divisor));
self
}
/// Finish binding the vertex attributes.
///
/// If `base_vertex` was set to true, returns the base vertex to use when drawing.
pub fn bind(mut self) -> Option<gl::types::GLint> {
let ctxt = self.context;
if ctxt.version >= &Version(Api::Gl, 3, 0) || ctxt.version >= &Version(Api::GlEs, 3, 0) ||
ctxt.extensions.gl_arb_vertex_array_object || ctxt.extensions.gl_oes_vertex_array_object
|| ctxt.extensions.gl_apple_vertex_array_object
{
// VAOs are supported
// finding the base vertex
let base_vertex = if self.base_vertex {
Some(self.vertex_buffers.iter()
.filter(|&&(_, _, _, _, div)| div.is_none())
.map(|&(_, _, off, stride, _)| off / stride)
.min().unwrap_or(0))
} else {
None
};
// removing the offset corresponding to the base vertex
if let Some(base_vertex) = base_vertex {
for &mut (_, _, ref mut off, stride, _) in self.vertex_buffers.iter_mut() {
*off -= base_vertex * stride;
}
}
let mut buffers_list: Vec<_> = self.vertex_buffers.iter()
.map(|&(v, _, o, s, _)| (v, o))
.collect();
buffers_list.push((self.element_array_buffer.map(|b| b.get_id()).unwrap_or(0), 0));
buffers_list.sort_unstable();
let program_id = self.program.get_id();
// trying to find an existing VAO in the cache
if let Some(value) = ctxt.vertex_array_objects.vaos.borrow_mut()
.get(&(buffers_list.clone(), program_id))
{
value.bind(ctxt);
return base_vertex.map(|v| v as gl::types::GLint);
}
// if not found, building a new one
let new_vao = unsafe {
VertexArrayObject::new(ctxt, &self.vertex_buffers,
self.element_array_buffer, self.program)
};
new_vao.bind(ctxt);
ctxt.vertex_array_objects.vaos.borrow_mut().insert((buffers_list, program_id), new_vao);
base_vertex.map(|v| v as gl::types::GLint)
} else {
// VAOs are not supported
// just in case
bind_vao(ctxt, 0);
if let Some(element_array_buffer) = self.element_array_buffer {
element_array_buffer.bind_to_element_array(ctxt);
}
for (vertex_buffer, bindings, offset, stride, divisor) in self.vertex_buffers.into_iter() {
unsafe {
bind_attribute(ctxt, self.program, vertex_buffer, &bindings, offset, stride,
divisor);
}
}
// TODO: it is unlikely that a backend supports base vertex but not VAOs, so we just
// ignore this case ; however it would ideally be better to handle it
if self.base_vertex {
Some(0)
} else {
None
}
}
}
}
/// Stores informations about how to bind a vertex buffer, an index buffer and a program.
struct VertexArrayObject {
id: gl::types::GLuint,
destroyed: bool,
element_array_buffer: gl::types::GLuint,
element_array_buffer_hijacked: Cell<bool>,
}
impl VertexArrayObject {
/// Builds a new `VertexArrayObject`.
///
/// The vertex buffer, index buffer and program must not outlive the
/// VAO, and the VB & program attributes must not change.
unsafe fn new(mut ctxt: &mut CommandContext<'_>,
vertex_buffers: &[(gl::types::GLuint, VertexFormat, usize, usize, Option<u32>)],
index_buffer: Option<BufferAnySlice<'_>>, program: &Program) -> VertexArrayObject
{
// checking the attributes types
for &(_, ref bindings, _, _, _) in vertex_buffers {
for &(ref name, _, location, ty, _) in bindings.iter() {
let attribute = match location {
-1 => {
// No location specified in Vertex Format. Check name instead
match program.get_attribute(Borrow::<str>::borrow(name)) {
Some(a) => a,
None => continue,
}
}
_ => {
match program.attributes().into_iter()
.find(|(_, a)| a.location == location) {
Some((_, a)) => a,
None => continue,
}
}
};
if ty.get_num_components() != attribute.ty.get_num_components() ||
attribute.size != 1
{
panic!("The program attribute `{}` does not match the vertex format. \
Program expected {:?}, got {:?}.", name, attribute.ty, ty);
}
}
}
// checking for duplicate attribute locations
for &(_, ref bindings, _, _, _) in vertex_buffers {
for (i, bi) in bindings.iter().enumerate() {
for (o, bo) in bindings.iter().enumerate() {
if i != o && bi.2 == bo.2 && bi.2 != -1 {
panic!("The program attribute `{}` has the same binding location as program attribute `{}` (binding location {})",
bi.0, bo.0, bi.2)
}
}
}
}
// checking for missing attributes
for (&ref name, attribute) in program.attributes() {
let mut found = false;
for &(_, ref bindings, _, _, _) in vertex_buffers {
if bindings.iter().any(|&(ref n, _, location, _, _)| (location != -1 && location == attribute.location) || n == name) {
found = true;
break;
}
}
if !found {
panic!("The program attribute `{}` is missing in the vertex bindings", name);
}
};
// TODO: check for collisions between the vertices sources
// building the VAO
let id = {
let mut id = 0;
if ctxt.version >= &Version(Api::Gl, 3, 0) ||
ctxt.version >= &Version(Api::GlEs, 3, 0) ||
ctxt.extensions.gl_arb_vertex_array_object
{
ctxt.gl.GenVertexArrays(1, &mut id);
} else if ctxt.extensions.gl_oes_vertex_array_object {
ctxt.gl.GenVertexArraysOES(1, &mut id);
} else if ctxt.extensions.gl_apple_vertex_array_object {
ctxt.gl.GenVertexArraysAPPLE(1, &mut id);
} else {
unreachable!();
};
id
};
// we don't use DSA as we're going to make multiple calls for this VAO
// and we're likely going to use the VAO right after it's been created
bind_vao(&mut ctxt, id);
// binding index buffer
if let Some(index_buffer) = index_buffer {
index_buffer.bind_to_element_array(&mut ctxt);
}
for &(vertex_buffer, ref bindings, offset, stride, divisor) in vertex_buffers {
bind_attribute(ctxt, program, vertex_buffer, bindings, offset, stride, divisor);
}
VertexArrayObject {
id,
destroyed: false,
element_array_buffer: index_buffer.map(|b| b.get_id()).unwrap_or(0),
element_array_buffer_hijacked: Cell::new(false),
}
}
/// Sets this VAO as the current VAO.
fn bind(&self, ctxt: &mut CommandContext<'_>) {
unsafe {
bind_vao(ctxt, self.id);
if self.element_array_buffer_hijacked.get() {
// TODO: use a proper function
if ctxt.version >= &Version(Api::Gl, 1, 5) ||
ctxt.version >= &Version(Api::GlEs, 2, 0)
{
ctxt.gl.BindBuffer(gl::ELEMENT_ARRAY_BUFFER, self.element_array_buffer);
} else if ctxt.extensions.gl_arb_vertex_buffer_object {
ctxt.gl.BindBufferARB(gl::ELEMENT_ARRAY_BUFFER_ARB, self.element_array_buffer);
} else {
unreachable!();
}
self.element_array_buffer_hijacked.set(false);
}
}
}
/// Must be called to destroy the VAO (otherwise its destructor will panic as a safety
/// measure).
fn destroy(mut self, ctxt: &mut CommandContext<'_>) {
self.destroyed = true;
// unbinding
if ctxt.state.vertex_array == self.id {
ctxt.state.vertex_array = 0;
}
// deleting
if ctxt.version >= &Version(Api::Gl, 3, 0) ||
ctxt.version >= &Version(Api::GlEs, 3, 0) ||
ctxt.extensions.gl_arb_vertex_array_object
{
unsafe { ctxt.gl.DeleteVertexArrays(1, [ self.id ].as_ptr()) };
} else if ctxt.extensions.gl_oes_vertex_array_object {
unsafe { ctxt.gl.DeleteVertexArraysOES(1, [ self.id ].as_ptr()) };
} else if ctxt.extensions.gl_apple_vertex_array_object {
unsafe { ctxt.gl.DeleteVertexArraysAPPLE(1, [ self.id ].as_ptr()) };
} else {
unreachable!();
}
}
}
impl Drop for VertexArrayObject {
#[inline]
fn drop(&mut self) {
assert!(self.destroyed);
}
}
impl GlObject for VertexArrayObject {
type Id = gl::types::GLuint;
#[inline]
fn get_id(&self) -> gl::types::GLuint {
self.id
}
}
fn vertex_binding_type_to_gl(ty: AttributeType) -> (gl::types::GLenum, gl::types::GLint, gl::types::GLint) {
match ty {
AttributeType::I8 => (gl::BYTE, 1, 1),
AttributeType::I8I8 => (gl::BYTE, 2, 1),
AttributeType::I8I8I8 => (gl::BYTE, 3, 1),
AttributeType::I8I8I8I8 => (gl::BYTE, 4, 1),
AttributeType::U8 => (gl::UNSIGNED_BYTE, 1, 1),
AttributeType::U8U8 => (gl::UNSIGNED_BYTE, 2, 1),
AttributeType::U8U8U8 => (gl::UNSIGNED_BYTE, 3, 1),
AttributeType::U8U8U8U8 => (gl::UNSIGNED_BYTE, 4, 1),
AttributeType::I16 => (gl::SHORT, 1, 1),
AttributeType::I16I16 => (gl::SHORT, 2, 1),
AttributeType::I16I16I16 => (gl::SHORT, 3, 1),
AttributeType::I16I16I16I16 => (gl::SHORT, 4, 1),
AttributeType::U16 => (gl::UNSIGNED_SHORT, 1, 1),
AttributeType::U16U16 => (gl::UNSIGNED_SHORT, 2, 1),
AttributeType::U16U16U16 => (gl::UNSIGNED_SHORT, 3, 1),
AttributeType::U16U16U16U16 => (gl::UNSIGNED_SHORT, 4, 1),
AttributeType::I32 => (gl::INT, 1, 1),
AttributeType::I32I32 => (gl::INT, 2, 1),
AttributeType::I32I32I32 => (gl::INT, 3, 1),
AttributeType::I32I32I32I32 => (gl::INT, 4, 1),
AttributeType::U32 => (gl::UNSIGNED_INT, 1, 1),
AttributeType::U32U32 => (gl::UNSIGNED_INT, 2, 1),
AttributeType::U32U32U32 => (gl::UNSIGNED_INT, 3, 1),
AttributeType::U32U32U32U32 => (gl::UNSIGNED_INT, 4, 1),
AttributeType::I64 => (gl::INT64_NV, 1, 1),
AttributeType::I64I64 => (gl::INT64_NV, 2, 1),
AttributeType::I64I64I64 => (gl::INT64_NV, 3, 1),
AttributeType::I64I64I64I64 => (gl::INT64_NV, 4, 1),
AttributeType::U64 => (gl::UNSIGNED_INT64_NV, 1, 1),
AttributeType::U64U64 => (gl::UNSIGNED_INT64_NV, 2, 1),
AttributeType::U64U64U64 => (gl::UNSIGNED_INT64_NV, 3, 1),
AttributeType::U64U64U64U64 => (gl::UNSIGNED_INT64_NV, 4, 1),
AttributeType::F16 => (gl::HALF_FLOAT, 1, 1),
AttributeType::F16F16 => (gl::HALF_FLOAT, 2, 1),
AttributeType::F16F16F16 => (gl::HALF_FLOAT, 3, 1),
AttributeType::F16F16F16F16 => (gl::HALF_FLOAT, 4, 1),
AttributeType::F16x2x2 => (gl::HALF_FLOAT, 2, 2),
AttributeType::F16x2x3 => (gl::HALF_FLOAT, 2, 3),
AttributeType::F16x2x4 => (gl::HALF_FLOAT, 2, 4),
AttributeType::F16x3x2 => (gl::HALF_FLOAT, 3, 2),
AttributeType::F16x3x3 => (gl::HALF_FLOAT, 3, 3),
AttributeType::F16x3x4 => (gl::HALF_FLOAT, 3, 4),
AttributeType::F16x4x2 => (gl::HALF_FLOAT, 4, 2),
AttributeType::F16x4x3 => (gl::HALF_FLOAT, 4, 3),
AttributeType::F16x4x4 => (gl::HALF_FLOAT, 4, 4),
AttributeType::F32 => (gl::FLOAT, 1, 1),
AttributeType::F32F32 => (gl::FLOAT, 2, 1),
AttributeType::F32F32F32 => (gl::FLOAT, 3, 1),
AttributeType::F32F32F32F32 => (gl::FLOAT, 4, 1),
AttributeType::F32x2x2 => (gl::FLOAT, 2, 2),
AttributeType::F32x2x3 => (gl::FLOAT, 2, 3),
AttributeType::F32x2x4 => (gl::FLOAT, 2, 4),
AttributeType::F32x3x2 => (gl::FLOAT, 3, 2),
AttributeType::F32x3x3 => (gl::FLOAT, 3, 3),
AttributeType::F32x3x4 => (gl::FLOAT, 3, 4),
AttributeType::F32x4x2 => (gl::FLOAT, 4, 2),
AttributeType::F32x4x3 => (gl::FLOAT, 4, 3),
AttributeType::F32x4x4 => (gl::FLOAT, 4, 4),
AttributeType::F64 => (gl::DOUBLE, 1, 1),
AttributeType::F64F64 => (gl::DOUBLE, 2, 1),
AttributeType::F64F64F64 => (gl::DOUBLE, 3, 1),
AttributeType::F64F64F64F64 => (gl::DOUBLE, 4, 1),
AttributeType::F64x2x2 => (gl::DOUBLE, 2, 2),
AttributeType::F64x2x3 => (gl::DOUBLE, 2, 3),
AttributeType::F64x2x4 => (gl::DOUBLE, 2, 4),
AttributeType::F64x3x2 => (gl::DOUBLE, 3, 2),
AttributeType::F64x3x3 => (gl::DOUBLE, 3, 3),
AttributeType::F64x3x4 => (gl::DOUBLE, 3, 4),
AttributeType::F64x4x2 => (gl::DOUBLE, 4, 2),
AttributeType::F64x4x3 => (gl::DOUBLE, 4, 3),
AttributeType::F64x4x4 => (gl::DOUBLE, 4, 4),
AttributeType::I2I10I10I10Reversed => (gl::INT_2_10_10_10_REV, 4, 1),
AttributeType::U2U10U10U10Reversed => (gl::UNSIGNED_INT_2_10_10_10_REV, 4, 1),
AttributeType::I10I10I10I2 => (gl::INT_10_10_10_2_OES, 4, 1),
AttributeType::U10U10U10U2 => (gl::UNSIGNED_INT_10_10_10_2_OES, 4, 1),
AttributeType::F10F11F11UnsignedIntReversed => (gl::UNSIGNED_INT_10F_11F_11F_REV, 3, 1),
AttributeType::FixedFloatI16U16 => (gl::FIXED, 1, 1),
}
}
/// Binds the vertex array object as the current one. Unbinds if `0` is passed.
///
/// ## Panic
///
/// Panics if the backend doesn't support vertex array objects.
fn bind_vao(ctxt: &mut CommandContext<'_>, vao_id: gl::types::GLuint) {
if ctxt.state.vertex_array != vao_id {
if ctxt.version >= &Version(Api::Gl, 3, 0) ||
ctxt.version >= &Version(Api::GlEs, 3, 0) ||
ctxt.extensions.gl_arb_vertex_array_object
{
unsafe { ctxt.gl.BindVertexArray(vao_id) };
} else if ctxt.extensions.gl_oes_vertex_array_object {
unsafe { ctxt.gl.BindVertexArrayOES(vao_id) };
} else if ctxt.extensions.gl_apple_vertex_array_object {
unsafe { ctxt.gl.BindVertexArrayAPPLE(vao_id) };
} else {
unreachable!();
}
ctxt.state.vertex_array = vao_id;
}
}
/// Binds an individual attribute to the current VAO.
unsafe fn bind_attribute(ctxt: &mut CommandContext<'_>, program: &Program,
vertex_buffer: gl::types::GLuint, bindings: &VertexFormat,
buffer_offset: usize, stride: usize, divisor: Option<u32>)
{
// glVertexAttribPointer uses the current array buffer
// TODO: use a proper function
if ctxt.state.array_buffer_binding != vertex_buffer {
if ctxt.version >= &Version(Api::Gl, 1, 5) ||
ctxt.version >= &Version(Api::GlEs, 2, 0)
{
ctxt.gl.BindBuffer(gl::ARRAY_BUFFER, vertex_buffer);
} else if ctxt.extensions.gl_arb_vertex_buffer_object {
ctxt.gl.BindBufferARB(gl::ARRAY_BUFFER_ARB, vertex_buffer);
} else {
unreachable!();
}
ctxt.state.array_buffer_binding = vertex_buffer;
}
// binding attributes
for &(ref name, offset, location, ty, normalize) in bindings.iter() {
let (data_type, elements_count, instances_count) = vertex_binding_type_to_gl(ty);
let attribute = match location {
-1 => {
// No location specified in Vertex Format. Check name instead
match program.get_attribute(Borrow::<str>::borrow(name)) {
Some(a) => a,
None => continue,
}
}
_ => {
match program.attributes().into_iter()
.find(|(_, a)| a.location == location) {
Some((_, a)) => a,
None => continue,
}
}
};
if attribute.location != -1 {
let (attribute_ty, _, _) = vertex_binding_type_to_gl(attribute.ty);
if normalize {
for i in 0..instances_count {
ctxt.gl.VertexAttribPointer((attribute.location + i) as u32,
elements_count as gl::types::GLint, data_type, 1,
stride as i32,
(buffer_offset + offset + (i * elements_count * 4) as usize) as *const _)
}
} else {
match attribute_ty {
gl::BYTE | gl::UNSIGNED_BYTE | gl::SHORT | gl::UNSIGNED_SHORT |
gl::INT | gl::UNSIGNED_INT =>
ctxt.gl.VertexAttribIPointer(attribute.location as u32,
elements_count as gl::types::GLint, data_type,
stride as i32,
(buffer_offset + offset) as *const _),
gl::FLOAT => {
for i in 0..instances_count {
ctxt.gl.VertexAttribPointer((attribute.location + i) as u32,
elements_count as gl::types::GLint, data_type, 0,
stride as i32,
(buffer_offset + offset + (i * elements_count * 4) as usize) as *const _)
}
},
gl::DOUBLE | gl::INT64_NV | gl::UNSIGNED_INT64_NV => {
for i in 0..instances_count {
ctxt.gl.VertexAttribLPointer((attribute.location + i) as u32,
elements_count as gl::types::GLint, data_type,
stride as i32,
(buffer_offset + offset + (i * elements_count * 8) as usize) as *const _)
}
},
_ => unreachable!()
}
}
for i in 0..instances_count {
if let Some(divisor) = divisor {
ctxt.gl.VertexAttribDivisor((attribute.location + i) as u32, divisor);
}
ctxt.gl.EnableVertexAttribArray((attribute.location + i) as u32);
}
}
}
}