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source: trunk/src/gl/gl_context.cc @ 501

Last change on this file since 501 was 501, checked in by epyon, 9 years ago
particle engine updates device/context redesign caching of GL state - texture bindings and programs camera view_perspective and view_perspective_inv
File size: 34.3 KB

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1	// Copyright (C) 2012-2015 ChaosForge Ltd
2	// http://chaosforge.org/
3	//
4	// This file is part of Nova libraries.
5	// For conditions of distribution and use, see copying.txt file in root folder.
6
7	#include "nv/gl/gl_context.hh"
8
9	#include "nv/gl/gl_enum.hh"
10	#include "nv/lib/gl.hh"
11	#include "nv/gl/gl_device.hh"
12	#include "nv/core/logger.hh"
13
14	using namespace nv;
15
16	nv::vertex_array nv::gl_context::create_vertex_array( const vertex_array_desc& desc )
17	{
18	vertex_array result = m_vertex_arrays.create();
19	gl_vertex_array_info* info = m_vertex_arrays.get( result );
20
21	glGenVertexArrays( 1, &info->glid );
22	info->count = desc.count;
23	info->index = desc.index;
24	info->index_owner = desc.index_owner;
25	info->index_type = desc.index_type;
26
27	for ( uint32 i = 0; i < desc.count; ++i )
28	info->attr[i] = desc.attr[i];
29
30	glBindVertexArray( info->glid );
31
32	for ( uint32 i = 0; i < info->count; ++i )
33	{
34	const vertex_buffer_attribute& vba = info->attr[i];
35	uint32 location = static_cast<uint32>( vba.location );
36	glEnableVertexAttribArray( location );
37	const gl_buffer_info* vinfo = static_cast<const gl_buffer_info*>( m_device->get_buffer_info( vba.vbuffer ) );
38	if ( vinfo && vinfo->type == VERTEX_BUFFER )
39	glBindBuffer( GL_ARRAY_BUFFER, vinfo->glid );
40	else
41	{
42	// TODO: report error
43	}
44
45	glVertexAttribPointer(
46	location,
47	static_cast<GLint>( vba.components ),
48	nv::datatype_to_gl_enum( vba.dtype ),
49	GL_FALSE,
50	static_cast<GLsizei>( vba.stride ),
51	reinterpret_cast<void*>( vba.offset )
52	);
53	}
54	glBindBuffer( GL_ARRAY_BUFFER, 0 );
55
56	if ( info->index.is_valid() )
57	{
58	const gl_buffer_info* iinfo = static_cast<const gl_buffer_info*>( m_device->get_buffer_info( info->index ) );
59	if ( iinfo && iinfo->type == INDEX_BUFFER )
60	{
61	glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, iinfo->glid );
62	}
63	else
64	{
65	// TODO: report error
66	}
67	}
68	glBindVertexArray( 0 );
69
70	if ( info->index.is_valid() )
71	{
72	glBindBuffer( GL_ELEMENT_ARRAY_BUFFER, 0 );
73	}
74
75	// for ( uint32 i = 0; i < info->count; ++i )
76	// {
77	// glDisableVertexAttribArray( static_cast<uint32>( info->attr[i].location ) );
78	// }
79
80
81	return result;
82	}
83
84	nv::framebuffer nv::gl_context::create_framebuffer( uint32 temp_samples )
85	{
86	unsigned glid = 0;
87	glGenFramebuffers( 1, &glid );
88	framebuffer result = m_framebuffers.create();
89	gl_framebuffer_info* info = m_framebuffers.get( result );
90	info->glid = glid;
91	info->depth_rb_glid = 0;
92	info->color_attachment_count = 0;
93	info->sample_count = temp_samples;
94	return result;
95	}
96
97	void nv::gl_context::release( vertex_array va )
98	{
99	gl_vertex_array_info* info = m_vertex_arrays.get( va );
100	if ( info )
101	{
102	for ( uint32 i = 0; i < info->count; ++i )
103	{
104	if ( info->attr[i].owner )
105	release( info->attr[i].vbuffer );
106	}
107	if ( info->index.is_valid() && info->index_owner) release( info->index );
108	glDeleteVertexArrays( 1, &info->glid );
109	m_vertex_arrays.destroy( va );
110	}
111	}
112
113	void nv::gl_context::release( framebuffer f )
114	{
115	gl_framebuffer_info* info = m_framebuffers.get( f );
116	if ( info )
117	{
118	// TODO: release textures?
119	glBindFramebuffer( GL_FRAMEBUFFER, 0 );
120	glBindRenderbuffer( GL_RENDERBUFFER, 0 );
121	if ( info->depth_rb_glid == 0 )
122	glDeleteRenderbuffers( 1, &info->depth_rb_glid );
123	glDeleteFramebuffers( 1, &info->glid );
124	m_framebuffers.destroy( f );
125	}
126	}
127
128	const framebuffer_info* nv::gl_context::get_framebuffer_info( framebuffer f ) const
129	{
130	return m_framebuffers.get( f );
131	}
132
133	void nv::gl_context::attach( framebuffer f, output_slot slot, texture t, int layer /* = -1*/ )
134	{
135	// TODO: framebuffer variable, so no re-binding?
136	// TODO: support 1d, 3d textures, cubemaps or layers?
137	// TODO: support GL_READ_FRAMEBUFFER?
138	const gl_framebuffer_info* info = m_framebuffers.get( f );
139	const gl_texture_info* tinfo = static_cast< const gl_texture_info* >( m_device->get_texture_info( t ) );
140	if ( info )
141	{
142	glBindFramebuffer( GL_FRAMEBUFFER, info->glid );
143	unsigned gl_type = texture_type_to_enum( tinfo->type );
144	unsigned tglid = tinfo ? tinfo->glid : 0;
145
146	if ( layer >= 0 )
147	{
148	glFramebufferTextureLayer( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + unsigned( slot ), tglid, 0, layer );
149	}
150	else
151	{
152	glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + unsigned( slot ), gl_type, tglid, 0 );
153	}
154
155	}
156	}
157
158	void nv::gl_context::attach( framebuffer f, texture depth, int layer /= -1/ )
159	{
160	// TODO: framebuffer variable, so no re-binding?
161	// TODO: support GL_READ_FRAMEBUFFER?
162	const gl_framebuffer_info* info = m_framebuffers.get( f );
163	const gl_texture_info* tinfo = static_cast< const gl_texture_info* >( m_device->get_texture_info( depth ) );
164	if ( info )
165	{
166	glBindFramebuffer( GL_FRAMEBUFFER, info->glid );
167	unsigned gl_type = texture_type_to_enum( tinfo->type );
168	unsigned glid = ( tinfo ? tinfo->glid : 0 );
169	if ( layer >= 0 )
170	{
171	glFramebufferTextureLayer( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, glid, 0, layer );
172	}
173	else
174	{
175	glFramebufferTexture2D( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, gl_type, glid, 0 );
176	}
177	}
178
179	}
180
181	void nv::gl_context::attach( framebuffer f, ivec2 size )
182	{
183	// TODO: framebuffer variable, so no re-binding?
184	// TODO: support GL_READ_FRAMEBUFFER?
185	gl_framebuffer_info* info = m_framebuffers.get( f );
186	if ( info )
187	{
188	glBindFramebuffer( GL_FRAMEBUFFER, info->glid );
189	if ( info->depth_rb_glid )
190	glDeleteRenderbuffers( 1, &(info->depth_rb_glid) );
191	glGenRenderbuffers( 1, &(info->depth_rb_glid) );
192	glBindRenderbuffer( GL_RENDERBUFFER, info->depth_rb_glid );
193	if ( info->sample_count > 1 )
194	glRenderbufferStorageMultisample( GL_RENDERBUFFER, info->sample_count, GL_DEPTH_COMPONENT16, size.x, size.y );
195	else
196	glRenderbufferStorage( GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, size.x, size.y );
197	glFramebufferRenderbuffer( GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, info->depth_rb_glid );
198	glBindRenderbuffer( GL_RENDERBUFFER, 0 );
199	}
200
201	}
202
203	void nv::gl_context::blit( framebuffer f, clear_state::buffers_type mask, ivec2 src1, ivec2 src2, ivec2 dst1, ivec2 dst2 )
204	{
205	gl_framebuffer_info* info = m_framebuffers.get( f );
206	if ( info )
207	{
208	glBindFramebuffer( GL_FRAMEBUFFER, info->glid );
209	unsigned filter = mask == clear_state::COLOR_BUFFER ? GL_LINEAR : GL_NEAREST;
210	glBlitFramebuffer( src1.x, src1.y, src2.x, src2.y, dst1.x, dst1.y, dst2.x, dst2.y, clear_state_buffers_to_mask( mask ), filter );
211	}
212	}
213
214
215	void nv::gl_context::blit( framebuffer from, framebuffer to, clear_state::buffers_type mask, ivec2 src1, ivec2 src2, ivec2 dst1, ivec2 dst2 )
216	{
217	gl_framebuffer_info* finfo = m_framebuffers.get( from );
218	gl_framebuffer_info* tinfo = m_framebuffers.get( to );
219	if ( finfo )
220	{
221	glBindFramebuffer( GL_READ_FRAMEBUFFER, finfo->glid );
222	glBindFramebuffer( GL_DRAW_FRAMEBUFFER, tinfo ? tinfo->glid : 0 );
223	unsigned filter = mask == clear_state::COLOR_BUFFER ? GL_LINEAR : GL_NEAREST;
224	glBlitFramebuffer( src1.x, src1.y, src2.x, src2.y, dst1.x, dst1.y, dst2.x, dst2.y, clear_state_buffers_to_mask( mask ), filter );
225	glBindFramebuffer( GL_READ_FRAMEBUFFER, 0 );
226	if ( tinfo ) glBindFramebuffer( GL_DRAW_FRAMEBUFFER, 0 );
227	}
228	}
229
230	bool nv::gl_context::check( framebuffer_slot ft )
231	{
232	glDrawBuffer( 0 );
233	glReadBuffer( 0 );
234
235	unsigned result = glCheckFramebufferStatus( framebuffer_slot_to_enum(ft) );
236	if ( result == GL_FRAMEBUFFER_COMPLETE ) return true;
237	switch ( result )
238	{
239	case GL_FRAMEBUFFER_UNDEFINED : NV_LOG_ERROR( "gl_context::check : Framebuffer undefined!" ); break;
240	case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE : NV_LOG_ERROR( "gl_context::check : Incomplete multisample!" ); break;
241	case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS : NV_LOG_ERROR( "gl_context::check : Incomplete layer targets!" ); break;
242	case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT : NV_LOG_ERROR( "gl_context::check : Framebuffer incomplete attachment!" ); break;
243	case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT : NV_LOG_ERROR( "gl_context::check : Framebuffer missing attachment!" ); break;
244	// case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS : NV_LOG_ERROR( "gl_context::check : Framebuffer incomplete dimensions!" ); break;
245	// case GL_FRAMEBUFFER_INCOMPLETE_FORMATS : NV_LOG_ERROR( "gl_context::check : Framebuffer incomplete formats!" ); break;
246	case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER : NV_LOG_ERROR( "gl_context::check : Framebuffer incomplete draw buffer!" ); break;
247	case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER : NV_LOG_ERROR( "gl_context::check : Framebuffer incomplete read buffer!" ); break;
248	case GL_FRAMEBUFFER_UNSUPPORTED : NV_LOG_ERROR( "gl_context::check : Framebuffer format combination unsupported!" ); break;
249	default: NV_LOG_ERROR( "gl_context::check : Unknown Framebuffer error! (", result, ")" ); break;
250	}
251	glDrawBuffer( GL_BACK );
252	glReadBuffer( GL_BACK );
253	return false;
254	}
255
256	void nv::gl_context::bind( framebuffer f, framebuffer_slot ft /= FRAMEBUFFER_BOTH / )
257	{
258	const gl_framebuffer_info* info = m_framebuffers.get( f );
259	if ( info )
260	{
261	glBindFramebuffer( framebuffer_slot_to_enum(ft), info->glid );
262	}
263	else
264	{
265	glBindFramebuffer( framebuffer_slot_to_enum(ft), 0 );
266	}
267	}
268
269
270	void nv::gl_context::bind( buffer b, texture t )
271	{
272	const gl_buffer_info* binfo = static_cast< const gl_buffer_info* >( m_device->get_buffer_info( b ) );
273	const gl_texture_info* tinfo = static_cast< const gl_texture_info* >( m_device->get_texture_info( t ) );
274	NV_ASSERT( binfo && tinfo, "Bad buffer or texture passed to create_texture" );
275	if ( binfo && tinfo )
276	{
277	NV_ASSERT_ALWAYS( binfo->type == TEXTURE_BUFFER && tinfo->type == TEXTURE_1D_BUFFER, "bad texture or buffer type!" );
278	bind( t, TEXTURE_0 );
279	glTexBuffer( GL_TEXTURE_BUFFER, image_format_to_internal_enum( tinfo->format.format ), binfo->glid );
280	}
281	}
282
283	void nv::gl_context::bind( buffer b, uint32 index, size_t offset /= 0/, size_t size /= 0 / )
284	{
285	const gl_buffer_info* info = static_cast< const gl_buffer_info* >( m_device->get_buffer_info( b ) );
286	if ( info )
287	{
288	if ( size == 0 )
289	glBindBufferBase( buffer_type_to_enum( info->type ), index, info->glid );
290	else
291	glBindBufferRange( buffer_type_to_enum( info->type ), index, info->glid, static_cast<GLintptr>( offset ), static_cast<GLsizeiptr>( size ) );
292	}
293	}
294
295	void gl_context::bind( texture t, texture_slot slot )
296	{
297	if ( m_bound_textures[ slot ] != t )
298	{
299	const gl_texture_info* info = static_cast< const gl_texture_info* >( m_device->get_texture_info( t ) );
300	if ( info )
301	{
302	set_active_texture( slot );
303	glBindTexture( texture_type_to_enum( info->type ), info->glid );
304	m_bound_textures[slot] = t;
305	}
306	}
307	}
308
309	void nv::gl_context::bind( program p )
310	{
311	gl_device* gdevice = static_cast<gl_device*>( m_device );
312	gl_program_info* info = gdevice->m_programs.get( p );
313	if ( info )
314	{
315	if ( m_bound_program != p )
316	glUseProgram( info->glid );
317	gdevice->update_uniforms( info );
318	if ( !info->validated )
319	{
320	validate_program( p );
321	}
322	m_bound_program = p;
323	}
324	}
325
326	bool nv::gl_context::validate_program( program p )
327	{
328	gl_device* gdevice = static_cast<gl_device*>( m_device );
329	gl_program_info* info = gdevice->m_programs.get( p );
330	if ( info )
331	{
332	info->validated = true;
333	const uint32 buffer_size = 1024;
334	char buffer[buffer_size] = { 0 };
335	int length;
336	int status;
337	glValidateProgram( info->glid );
338	glGetProgramiv( info->glid, GL_VALIDATE_STATUS, &status );
339
340	if ( status == GL_FALSE )
341	{
342	glGetProgramInfoLog( info->glid, buffer_size, &length, buffer );
343	NV_LOG_ERROR( "Program #", info->glid, " validation error : ", buffer );
344	return false;
345	}
346	return true;
347	}
348	return false;
349	}
350
351
352	// void nv::gl_context::bind( buffer b )
353	// {
354	// const gl_buffer_info* info = static_cast< const gl_buffer_info* >( m_device->get_buffer_info( b ) );
355	// if ( info )
356	// {
357	// glBindBuffer( buffer_type_to_enum( info->type ), info->glid );
358	// }
359	// }
360
361	void nv::gl_context::bind( vertex_array va )
362	{
363	gl_vertex_array_info* info = m_vertex_arrays.get( va );
364	if ( info )
365	{
366	glBindVertexArray( info->glid );
367	}
368	}
369
370	void nv::gl_context::unbind( program )
371	{
372	if ( m_bound_program )
373	glUseProgram( 0 );
374	m_bound_program = program();
375	}
376
377	void nv::gl_context::set_active_texture( texture_slot slot )
378	{
379	if ( slot != m_active_slot )
380	{
381	glActiveTexture( GL_TEXTURE0 + static_cast<GLenum>( slot ) );
382	m_active_slot = slot;
383	}
384	}
385
386	// void nv::gl_context::unbind( buffer b )
387	// {
388	// const gl_buffer_info* info = static_cast< const gl_buffer_info* >( m_device->get_buffer_info( b ) );
389	// if ( info )
390	// {
391	// glBindBuffer( buffer_type_to_enum( info->type ), 0 );
392	// }
393	// }
394
395	void nv::gl_context::unbind( vertex_array va )
396	{
397	const vertex_array_info* info = m_vertex_arrays.get( va );
398	if ( info )
399	{
400	glBindVertexArray( 0 );
401	}
402	}
403
404	void nv::gl_context::unbind( framebuffer f )
405	{
406	// this way we are sure that the extension is loaded
407	const gl_framebuffer_info* info = m_framebuffers.get( f );
408	if ( info )
409	{
410	glBindFramebuffer( GL_FRAMEBUFFER, 0 );
411	}
412	glDrawBuffer( GL_BACK );
413	glReadBuffer( GL_BACK );
414	}
415
416	void nv::gl_context::update( texture t, const void* data )
417	{
418	const gl_texture_info* info = static_cast< const gl_texture_info* >( m_device->get_texture_info( t ) );
419	NV_ASSERT_ALWAYS( info->type != TEXTURE_1D_BUFFER, "Buffer texture passed to update!" );
420	NV_ASSERT_ALWAYS( info->type != TEXTURE_2D_MULTISAMPLE, "Multisample texture passed to update!" );
421	if ( info )
422	{
423	image_format format = info->format;
424	ivec3 size = info->size;
425	unsigned gl_type = texture_type_to_enum( info->type );
426
427	bind( t, texture_slot::TEXTURE_0 );
428	if ( info->type == TEXTURE_3D \|\| info->type == TEXTURE_2D_ARRAY )
429	// glTexImage3D( gl_type, 0, static_cast<GLint>( nv::image_format_to_internal_enum( format.format ) ), size.x, size.y, size.z, 0, nv::image_format_to_enum( format.format ), nv::datatype_to_gl_enum( format.type ), data );
430	glTexSubImage3D( gl_type, 0, 0, 0, 0, size.x, size.y, size.z, nv::image_format_to_enum( format.format ), nv::datatype_to_gl_enum( format.type ), data );
431	else
432	// glTexImage2D( gl_type, 0, static_cast<GLint>( nv::image_format_to_internal_enum(format.format) ), size.x, size.y, 0, nv::image_format_to_enum(format.format), nv::datatype_to_gl_enum(format.type), data );
433	glTexSubImage2D( gl_type, 0, 0, 0, size.x, size.y, nv::image_format_to_enum( format.format ), nv::datatype_to_gl_enum( format.type ), data );
434	}
435	}
436
437	void* nv::gl_context::map_buffer( buffer b, buffer_access ba, size_t offset, size_t length )
438	{
439	const gl_buffer_info* info = static_cast<const gl_buffer_info*>( m_device->get_buffer_info( b ) );
440	unsigned int glenum = buffer_type_to_enum( info->type );
441	glBindBuffer( glenum, info->glid );
442	void* result = glMapBufferRange( glenum, GLintptr( offset ), GLsizeiptr( length ), buffer_access_to_bitfield( ba ) );
443	if ( result == nullptr )
444	{
445	while ( GLenum err = glGetError() )
446	switch ( err )
447	{
448	case GL_INVALID_VALUE : NV_LOG_ERROR( "map_buffer failed : GL_INVALID_VALUE" ) break;
449	case GL_INVALID_OPERATION : NV_LOG_ERROR( "map_buffer failed : GL_INVALID_OPERATION " ) break;
450	case GL_OUT_OF_MEMORY : NV_LOG_ERROR( "map_buffer failed : GL_OUT_OF_MEMORY " ) break;
451	default:
452	break;
453	}
454	}
455	return result;
456	}
457
458	void nv::gl_context::unmap_buffer( buffer b )
459	{
460	const gl_buffer_info* info = static_cast<const gl_buffer_info*>( m_device->get_buffer_info( b ) );
461	glUnmapBuffer( buffer_type_to_enum( info->type ) );
462	}
463
464	// void nv::gl_context::update( buffer b, uint32 index, const void* data, size_t offset, size_t size )
465	// {
466	// const gl_buffer_info* info = static_cast<const gl_buffer_info*>( m_device->get_buffer_info( b ) );
467	// if ( info )
468	// {
469	// GLenum glenum = buffer_type_to_enum( info->type );
470	// if ( size == 0 )
471	// glBindBufferBase( glenum, index, info->glid );
472	// else
473	// glBindBufferRange( glenum, index, info->glid, offset, size );
474	// glBufferSubData( glenum, GLintptr( offset ), GLsizeiptr( size ), data );
475	// }
476	// }
477
478	void gl_context::update( buffer b, const void* data, nv::size_t offset, nv::size_t size )
479	{
480	const gl_buffer_info* info = static_cast< const gl_buffer_info* >( m_device->get_buffer_info( b ) );
481	if ( info )
482	{
483	GLenum glenum = buffer_type_to_enum( info->type );
484	glBindBuffer( glenum, info->glid );
485	glBufferSubData( glenum, GLintptr( offset ), GLsizeiptr( size ), data );
486	}
487	}
488
489	void gl_context::clear( const clear_state& cs )
490	{
491	// apply_framebuffer
492
493	apply_scissor_test( cs.scissor_test );
494	apply_color_mask( cs.color_mask );
495	apply_depth_mask( cs.depth_mask );
496	// stencil_mask_separate
497
498	if ( m_clear_color != cs.color )
499	{
500	glClearColor( cs.color.r, cs.color.g, cs.color.b, cs.color.a );
501	m_clear_color = cs.color;
502	}
503
504	if ( m_clear_depth != cs.depth )
505	{
506	glClearDepth( cs.depth );
507	m_clear_depth = cs.depth;
508	}
509
510	if ( m_clear_stencil != cs.stencil )
511	{
512	glClearStencil( cs.stencil );
513	m_clear_stencil = cs.stencil;
514	}
515
516	glClear( clear_state_buffers_to_mask( cs.buffers ) );
517	}
518
519	const ivec4& gl_context::get_viewport()
520	{
521	return m_viewport;
522	}
523
524	void gl_context::set_viewport( const ivec4& viewport )
525	{
526	if ( m_viewport != viewport )
527	{
528	NV_ASSERT_ALWAYS( viewport.z > 0 && viewport.w > 0, "viewport dimensions must be greater than zero!" );
529	m_viewport = viewport;
530	glViewport( viewport.x, viewport.y, viewport.z, viewport.w );
531	}
532	}
533
534	void gl_context::enable( unsigned int what, bool value )
535	{
536	if ( value )
537	{
538	glEnable( what );
539	}
540	else
541	{
542	glDisable( what );
543	}
544	}
545
546	void gl_context::apply_stencil_test( const stencil_test& stencil )
547	{
548	if ( m_render_state.stencil_test.enabled != stencil.enabled )
549	{
550	enable( GL_STENCIL_TEST, stencil.enabled );
551	m_render_state.stencil_test.enabled = stencil.enabled;
552	}
553
554	if ( stencil.enabled )
555	{
556	apply_stencil_face( GL_FRONT, m_render_state.stencil_test.front_face, stencil.front_face );
557	apply_stencil_face( GL_BACK, m_render_state.stencil_test.back_face, stencil.back_face );
558	}
559	}
560
561	void gl_context::apply_stencil_face( unsigned face, stencil_test_face& stencil, const stencil_test_face& new_stencil )
562	{
563	if (( stencil.op_fail != new_stencil.op_fail ) \|\|
564	( stencil.op_depth_fail != new_stencil.op_depth_fail ) \|\|
565	( stencil.op_depth_pass != new_stencil.op_depth_pass ) )
566	{
567	glStencilOpSeparate( face,
568	stencil_operation_to_enum( new_stencil.op_fail ),
569	stencil_operation_to_enum( new_stencil.op_depth_fail ),
570	stencil_operation_to_enum( new_stencil.op_depth_pass )
571	);
572
573	stencil.op_fail = new_stencil.op_fail;
574	stencil.op_depth_fail = new_stencil.op_depth_fail;
575	stencil.op_depth_pass = new_stencil.op_depth_pass;
576	}
577
578	if (( stencil.function != new_stencil.function ) \|\|
579	( stencil.ref_value != new_stencil.ref_value ) \|\|
580	( stencil.mask != new_stencil.mask ))
581	{
582	glStencilFuncSeparate( face,
583	stencil_function_to_enum( new_stencil.function ),
584	new_stencil.ref_value,
585	new_stencil.mask
586	);
587
588	stencil.function = new_stencil.function;
589	stencil.ref_value = new_stencil.ref_value;
590	stencil.mask = new_stencil.mask;
591	}
592	}
593
594	void gl_context::apply_scissor_test( const scissor_test& scissor )
595	{
596	if ( m_render_state.scissor_test.enabled != scissor.enabled )
597	{
598	enable( GL_SCISSOR_TEST, scissor.enabled );
599	m_render_state.scissor_test.enabled = scissor.enabled;
600	}
601
602
603	if ( scissor.enabled )
604	{
605	NV_ASSERT_ALWAYS( scissor.dim.x > 0 && scissor.dim.y > 0, "scissor_test.rect dimension equal to zero!" );
606
607	if ( m_render_state.scissor_test.dim != scissor.dim \|\| m_render_state.scissor_test.pos != scissor.pos )
608	{
609	glScissor(
610	scissor.pos.x, scissor.pos.y,
611	scissor.dim.x, scissor.dim.y
612	);
613	m_render_state.scissor_test.dim = scissor.dim;
614	m_render_state.scissor_test.pos = scissor.pos;
615	}
616	}
617	}
618
619	void gl_context::apply_depth_test( const depth_test& depth )
620	{
621	if ( m_render_state.depth_test.enabled != depth.enabled )
622	{
623	enable( GL_DEPTH_TEST, depth.enabled );
624	m_render_state.depth_test.enabled = depth.enabled;
625	}
626
627	if ( depth.enabled )
628	{
629	if ( m_render_state.depth_test.function != depth.function )
630	{
631	glDepthFunc( depth_state_function_to_enum( depth.function ) );
632	m_render_state.depth_test.function = depth.function;
633	}
634	}
635	}
636
637	void gl_context::apply_depth_mask( bool mask )
638	{
639	if ( m_render_state.depth_mask != mask )
640	{
641	glDepthMask( mask );
642	m_render_state.depth_mask = mask;
643	}
644	}
645
646	void gl_context::apply_multisample( bool multisample )
647	{
648	if ( m_render_state.multisample != multisample )
649	{
650	glDepthMask( multisample );
651	m_render_state.multisample = multisample;
652	}
653	}
654
655	void gl_context::apply_polygon_mode( const polygon_mode& mode )
656	{
657	if ( m_render_state.polygon_mode.fill != mode.fill )
658	{
659	glPolygonMode( GL_FRONT_AND_BACK, polygon_mode_fill_to_enum( mode.fill ) );
660	m_render_state.polygon_mode.fill = mode.fill;
661	}
662	}
663
664
665	void gl_context::apply_depth_range( const depth_range& range )
666	{
667	NV_ASSERT_ALWAYS( range.near >= 0.0 && range.near <= 1.0, "render_state.depth_range.near must be between zero and one!" );
668	NV_ASSERT_ALWAYS( range.far >= 0.0 && range.far <= 1.0, "render_state.depth_range.far must be between zero and one!" );
669
670	if ((m_render_state.depth_range.far != range.far) \|\|
671	(m_render_state.depth_range.near != range.near))
672	{
673	glDepthRange( range.near, range.far );
674
675	m_render_state.depth_range.far = range.far;
676	m_render_state.depth_range.near = range.near;
677	}
678	}
679
680	void gl_context::apply_color_mask( const color_mask& mask )
681	{
682	if ( m_render_state.color_mask != mask )
683	{
684	glColorMask( mask.red, mask.green, mask.blue, mask.alpha );
685	m_render_state.color_mask = mask;
686	}
687	}
688
689	void gl_context::apply_blending( const blending& blend )
690	{
691	if ( m_render_state.blending.enabled != blend.enabled )
692	{
693	enable( GL_BLEND, blend.enabled );
694	m_render_state.blending.enabled = blend.enabled;
695	}
696
697	if ( blend.enabled )
698	{
699	if ((m_render_state.blending.src_rgb_factor != blend.src_rgb_factor ) \|\|
700	(m_render_state.blending.dst_rgb_factor != blend.dst_rgb_factor ) \|\|
701	(m_render_state.blending.src_alpha_factor != blend.src_alpha_factor ) \|\|
702	(m_render_state.blending.dst_alpha_factor != blend.dst_alpha_factor ))
703	{
704	glBlendFuncSeparate(
705	blending_factor_to_enum( blend.src_rgb_factor ),
706	blending_factor_to_enum( blend.dst_rgb_factor ),
707	blending_factor_to_enum( blend.src_alpha_factor ),
708	blending_factor_to_enum( blend.dst_alpha_factor )
709	);
710
711	m_render_state.blending.src_rgb_factor = blend.src_rgb_factor;
712	m_render_state.blending.dst_rgb_factor = blend.dst_rgb_factor;
713	m_render_state.blending.src_alpha_factor = blend.src_alpha_factor;
714	m_render_state.blending.dst_alpha_factor = blend.dst_alpha_factor;
715	}
716
717	if ((m_render_state.blending.rgb_equation != blend.rgb_equation ) \|\|
718	(m_render_state.blending.alpha_equation != blend.alpha_equation ))
719	{
720	glBlendEquationSeparate(
721	blending_equation_to_enum( blend.rgb_equation ),
722	blending_equation_to_enum( blend.alpha_equation )
723	);
724
725	m_render_state.blending.rgb_equation = blend.rgb_equation;
726	m_render_state.blending.alpha_equation = blend.alpha_equation;
727	}
728
729	if (( m_render_state.blending.color != blend.color ))
730	{
731	glBlendColor( blend.color.r, blend.color.g, blend.color.b, blend.color.a );
732	m_render_state.blending.color = blend.color;
733	}
734	}
735	}
736
737
738	void gl_context::apply_culling( const culling& cull )
739	{
740	if ( m_render_state.culling.enabled != cull.enabled )
741	{
742	enable( GL_CULL_FACE, cull.enabled );
743	m_render_state.culling.enabled = cull.enabled;
744	}
745
746	if ( cull.enabled )
747	{
748	if ( m_render_state.culling.face != cull.face )
749	{
750	glCullFace( culling_face_type_to_enum( cull.face ) );
751	m_render_state.culling.face = cull.face;
752	}
753	}
754
755	if ( m_render_state.culling.order != cull.order )
756	{
757	glFrontFace( culling_order_type_to_enum( cull.order ) );
758	m_render_state.culling.order = cull.order;
759	}
760	}
761
762
763	void gl_context::force_apply_render_state( const render_state& state )
764	{
765	enable( GL_CULL_FACE, state.culling.enabled );
766	glCullFace( culling_face_type_to_enum( state.culling.face ) );
767	glFrontFace( culling_order_type_to_enum( state.culling.order ) );
768
769	enable( GL_SCISSOR_TEST, state.scissor_test.enabled );
770	glScissor(
771	state.scissor_test.pos.x, state.scissor_test.pos.y,
772	state.scissor_test.dim.x, state.scissor_test.dim.y
773	);
774
775	enable( GL_STENCIL_TEST, state.stencil_test.enabled );
776	force_apply_stencil_face( GL_FRONT, state.stencil_test.front_face );
777	force_apply_stencil_face( GL_BACK, state.stencil_test.back_face );
778
779	enable( GL_DEPTH_TEST, state.depth_test.enabled );
780	glDepthFunc( depth_state_function_to_enum( state.depth_test.function ) );
781	glDepthRange( state.depth_range.near, state.depth_range.far );
782
783	enable( GL_BLEND, state.blending.enabled );
784	glBlendFuncSeparate(
785	blending_factor_to_enum( state.blending.src_rgb_factor ),
786	blending_factor_to_enum( state.blending.dst_rgb_factor ),
787	blending_factor_to_enum( state.blending.src_alpha_factor ),
788	blending_factor_to_enum( state.blending.dst_alpha_factor )
789	);
790	glBlendEquationSeparate(
791	blending_equation_to_enum( state.blending.rgb_equation ),
792	blending_equation_to_enum( state.blending.alpha_equation )
793	);
794	glBlendColor(
795	state.blending.color.r, state.blending.color.g,
796	state.blending.color.b, state.blending.color.a
797	);
798
799	glDepthMask( state.depth_mask );
800	glColorMask(
801	state.color_mask.red, state.color_mask.green,
802	state.color_mask.blue, state.color_mask.alpha
803	);
804	glPolygonMode( GL_FRONT_AND_BACK, polygon_mode_fill_to_enum( state.polygon_mode.fill ) );
805	}
806
807	void gl_context::force_apply_stencil_face( unsigned face, const stencil_test_face& stencil )
808	{
809	glStencilOpSeparate( face,
810	stencil_operation_to_enum( stencil.op_fail ),
811	stencil_operation_to_enum( stencil.op_depth_fail ),
812	stencil_operation_to_enum( stencil.op_depth_pass )
813	);
814
815	glStencilFuncSeparate( face,
816	stencil_function_to_enum( stencil.function ),
817	stencil.ref_value,
818	stencil.mask
819	);
820	}
821
822
823	void gl_context::apply_render_state( const render_state& state )
824	{
825	// apply_primitive_restart
826	apply_culling( state.culling );
827	// apply_program_point_size
828	// apply_rasterization_mode
829	apply_scissor_test( state.scissor_test );
830	apply_stencil_test( state.stencil_test );
831	apply_depth_test( state.depth_test );
832	apply_depth_range( state.depth_range );
833	apply_blending( state.blending );
834	apply_color_mask( state.color_mask );
835	apply_depth_mask( state.depth_mask );
836	apply_multisample( state.multisample );
837	apply_polygon_mode( state.polygon_mode );
838	}
839
840
841	gl_context::gl_context( device* a_device, void* a_handle )
842	: context( a_device ), m_handle( a_handle )
843	{
844	// TODO: configurable:
845	// load_gl_extensions( GL_EXT_FRAMEBUFFER_BLIT \| GL_EXT_FRAMEBUFFER_OBJECT \| GL_EXT_TEXTURE_ARRAY );
846	m_active_slot = texture_slot( -1 );
847	force_apply_render_state( m_render_state );
848	}
849
850
851	nv::gl_context::~gl_context()
852	{
853	while ( m_framebuffers.size() > 0 )
854	release( m_framebuffers.get_handle(0) );
855	while ( m_vertex_arrays.size() > 0 )
856	release( m_vertex_arrays.get_handle(0) );
857	}
858
859	void nv::gl_context::apply_engine_uniforms( program p, const scene_state& s )
860	{
861	gl_program_info* info = static_cast<gl_device*>( m_device )->m_programs.get( p );
862	if ( info )
863	{
864	for ( auto& u : *info->m_engine_uniforms )
865	{
866	u->set( this, &s );
867	}
868	}
869	}
870
871	nv::texture nv::gl_context::create_texture( texture_type type, ivec2 size, image_format aformat, sampler asampler, const void* data /= nullptr / )
872	{
873	texture result = create_texture( type, aformat.format );
874	gl_texture_info* info = static_cast<gl_device*>( m_device )->get_full_texture_info( result );
875	bind( result, texture_slot::TEXTURE_0 );
876	unsigned glid = info->glid;
877	unsigned gl_type = texture_type_to_enum( type );
878	GLenum gl_internal = GLenum( image_format_to_internal_enum( aformat.format ) );
879	unsigned gl_enum = image_format_to_enum( aformat.format );
880
881	bool is_depth = aformat.format == DEPTH16 \|\| aformat.format == DEPTH24 \|\| aformat.format == DEPTH32;
882
883	// Detect if mipmapping was requested
884	// if ( gl_type == GL_TEXTURE_2D && gl_enum != GL_RED_INTEGER && asampler.filter_min != sampler::LINEAR && asampler.filter_min != sampler::NEAREST )
885	// {
886	// // TODO: This should not be done if we use framebuffers!
887	// glTexParameteri( gl_type, GL_GENERATE_MIPMAP, GL_TRUE);
888	// }
889
890	if ( asampler.filter_max != sampler::NEAREST )
891	{
892	asampler.filter_max = sampler::LINEAR;
893	}
894
895	if ( gl_type != GL_TEXTURE_2D_MULTISAMPLE )
896	{
897	glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, GLint( nv::sampler_filter_to_enum( asampler.filter_min ) ) );
898	glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, GLint( nv::sampler_filter_to_enum( asampler.filter_max ) ) );
899	}
900
901	if ( gl_type != GL_TEXTURE_2D_MULTISAMPLE && gl_enum != GL_RED_INTEGER )
902	{
903	glTexParameteri( gl_type, GL_TEXTURE_WRAP_S, GLint( nv::sampler_wrap_to_enum( asampler.wrap_s ) ) );
904	glTexParameteri( gl_type, GL_TEXTURE_WRAP_T, GLint( nv::sampler_wrap_to_enum( asampler.wrap_t ) ) );
905	}
906
907	if ( is_depth )
908	{
909	// glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
910	// glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
911
912	// This is to allow usage of shadow2DProj function in the shader
913	glTexParameteri( gl_type, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE );
914	glTexParameteri( gl_type, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL );
915	}
916
917	// #define GL_TEXTURE_MAX_ANISOTROPY_EXT 0x84FE
918	// #define GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT 0x84FF
919	//
920	// float aniso = 0.0f;
921	// glGetFloatv( GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &aniso );
922	// NV_LOG_INFO( "Anisotropy at ", aniso, " (", int( aniso ), " ) " );
923	// glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, aniso );
924
925	if ( gl_type != GL_TEXTURE_2D_MULTISAMPLE )
926	glTexImage2D( gl_type, 0, gl_internal, size.x, size.y, 0, gl_enum, nv::datatype_to_gl_enum( aformat.type ), data );
927	else
928	glTexImage2DMultisample( gl_type, 4, gl_internal, size.x, size.y, 1 );
929
930	if ( gl_type == GL_TEXTURE_2D && gl_enum != GL_RED_INTEGER && asampler.filter_min != sampler::LINEAR && asampler.filter_min != sampler::NEAREST )
931	{
932	// TODO: This should not be done if we use framebuffers!
933	glGenerateMipmap( gl_type );
934	}
935
936	bind( texture(), texture_slot::TEXTURE_0 );
937
938	info->type = type;
939	info->format = aformat;
940	info->tsampler = asampler;
941	info->size = ivec3( size.x, size.y, 1 );
942	info->glid = glid;
943
944	return result;
945	}
946
947	nv::texture nv::gl_context::create_texture( texture_type type, ivec3 size, image_format aformat, sampler asampler, const void* data /= nullptr / )
948	{
949	texture result = create_texture( type, aformat.format );
950	gl_texture_info* info = static_cast<gl_device*>( m_device )->get_full_texture_info( result );
951	bind( result, texture_slot::TEXTURE_0 );
952	unsigned glid = info->glid;
953
954	unsigned gl_type = texture_type_to_enum( type );
955
956	bool is_depth = aformat.format == DEPTH16 \|\| aformat.format == DEPTH24 \|\| aformat.format == DEPTH32;
957
958	if ( asampler.filter_max != sampler::NEAREST )
959	{
960	asampler.filter_max = sampler::LINEAR;
961	}
962
963	glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, GLint( nv::sampler_filter_to_enum( asampler.filter_min ) ) );
964	glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, GLint( nv::sampler_filter_to_enum( asampler.filter_max ) ) );
965	glTexParameteri( gl_type, GL_TEXTURE_WRAP_S, GLint( nv::sampler_wrap_to_enum( asampler.wrap_s ) ) );
966	glTexParameteri( gl_type, GL_TEXTURE_WRAP_T, GLint( nv::sampler_wrap_to_enum( asampler.wrap_t ) ) );
967
968	if ( is_depth )
969	{
970	glTexParameteri( gl_type, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
971	glTexParameteri( gl_type, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
972
973	// This is to allow usage of shadow2DProj function in the shader
974	glTexParameteri( gl_type, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE );
975	glTexParameteri( gl_type, GL_TEXTURE_COMPARE_FUNC, GL_LEQUAL );
976	}
977
978	//glTexStorage3D( GL_TEXTURE_2D_ARRAY, mipLevelCount, GL_RGBA8, width, height, layerCount );
979	glTexImage3D( gl_type, 0, GLint( nv::image_format_to_internal_enum( aformat.format ) ), size.x, size.y, size.z, 0, nv::image_format_to_enum( aformat.format ), nv::datatype_to_gl_enum( aformat.type ), data );
980
981	bind( texture(), texture_slot::TEXTURE_0 );
982
983	info->type = type;
984	info->format = aformat;
985	info->tsampler = asampler;
986	info->size = size;
987	info->glid = glid;
988
989	return result;
990	}
991
992	nv::buffer nv::gl_context::create_buffer( buffer_type type, buffer_hint hint, size_t size, const void* source /= nullptr / )
993	{
994	buffer result = static_cast<gl_device*>( m_device )->create_buffer( type, hint );
995	if ( size > 0 ) create_buffer( result, size, source );
996	return result;
997	}
998
999	void nv::gl_context::create_buffer( buffer b, size_t size, const void* source /= nullptr / )
1000	{
1001	gl_buffer_info* info = static_cast<gl_device*>( m_device )->get_full_buffer_info( b );
1002	if ( info )
1003	{
1004	unsigned glenum = buffer_type_to_enum( info->type );
1005	glBindBuffer( glenum, info->glid );
1006	glBufferData( glenum, GLsizeiptr( size ), source, buffer_hint_to_enum( info->hint ) );
1007	glBindBuffer( glenum, 0 );
1008	}
1009	}
1010
1011	void nv::gl_context::set_draw_buffers( uint32 count, const output_slot* slots )
1012	{
1013	if ( count == 0 ) return;
1014	if ( count == 1 )
1015	{
1016	set_draw_buffer( slots[0] );
1017	return;
1018	}
1019	unsigned int buffers[8];
1020	count = nv::min<uint32>( count, 8 );
1021	for ( uint32 i = 0; i < count; ++i )
1022	{
1023	buffers[i] = output_slot_to_enum( slots[i] );
1024	if ( slots[i] > OUTPUT_7 ) buffers[i] = 0;
1025	}
1026	glDrawBuffers( GLsizei( count ), buffers );
1027	}
1028
1029	void nv::gl_context::set_draw_buffer( output_slot slot )
1030	{
1031	glDrawBuffer( output_slot_to_enum(slot) );
1032	}
1033
1034	void nv::gl_context::set_read_buffer( output_slot slot )
1035	{
1036	glReadBuffer( output_slot_to_enum(slot) );
1037	}
1038
1039	void gl_context::draw( primitive prim, const render_state& rs, program p, vertex_array va, nv::size_t count, nv::size_t first )
1040	{
1041	apply_render_state( rs );
1042	const vertex_array_info* info = m_vertex_arrays.get( va );
1043	if ( count > 0 && info )
1044	{
1045	bind( p );
1046	bind( va );
1047	if ( info->index.is_valid() )
1048	{
1049	glDrawElements( primitive_to_enum(prim), static_cast<GLsizei>( count ), datatype_to_gl_enum( info->index_type ), reinterpret_cast< const void* >( get_datatype_info( info->index_type ).size * first ) );
1050	}
1051	else
1052	{
1053	glDrawArrays( primitive_to_enum(prim), static_cast<GLint>( first ), static_cast<GLsizei>( count ) );
1054	}
1055	unbind( va );
1056	//unbind( p );
1057	}
1058	}

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