2 * Mesa 3-D graphics library
4 * Copyright (C) 2010 VMware, Inc. All Rights Reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
27 * Transform feedback support.
39 #include "transformfeedback.h"
40 #include "shaderapi.h"
41 #include "shaderobj.h"
42 #include "main/dispatch.h"
44 #include "program/prog_parameter.h"
46 struct using_program_tuple
48 struct gl_program
*prog
;
53 active_xfb_object_references_program(GLuint key
, void *data
, void *user_data
)
55 struct using_program_tuple
*callback_data
= user_data
;
56 struct gl_transform_feedback_object
*obj
= data
;
57 if (obj
->Active
&& obj
->program
== callback_data
->prog
)
58 callback_data
->found
= true;
62 * Return true if any active transform feedback object is using a program.
65 _mesa_transform_feedback_is_using_program(struct gl_context
*ctx
,
66 struct gl_shader_program
*shProg
)
68 if (!shProg
->last_vert_prog
)
71 struct using_program_tuple callback_data
;
72 callback_data
.found
= false;
73 callback_data
.prog
= shProg
->last_vert_prog
;
75 _mesa_HashWalkLocked(ctx
->TransformFeedback
.Objects
,
76 active_xfb_object_references_program
, &callback_data
);
78 /* Also check DefaultObject, as it's not in the Objects hash table. */
79 active_xfb_object_references_program(0, ctx
->TransformFeedback
.DefaultObject
,
82 return callback_data
.found
;
86 * Do reference counting of transform feedback buffers.
89 reference_transform_feedback_object(struct gl_transform_feedback_object
**ptr
,
90 struct gl_transform_feedback_object
*obj
)
96 /* Unreference the old object */
97 struct gl_transform_feedback_object
*oldObj
= *ptr
;
99 assert(oldObj
->RefCount
> 0);
102 if (oldObj
->RefCount
== 0) {
103 GET_CURRENT_CONTEXT(ctx
);
105 ctx
->Driver
.DeleteTransformFeedback(ctx
, oldObj
);
113 assert(obj
->RefCount
> 0);
115 /* reference new object */
117 obj
->EverBound
= GL_TRUE
;
124 * Per-context init for transform feedback.
127 _mesa_init_transform_feedback(struct gl_context
*ctx
)
129 /* core mesa expects this, even a dummy one, to be available */
130 assert(ctx
->Driver
.NewTransformFeedback
);
132 ctx
->TransformFeedback
.DefaultObject
=
133 ctx
->Driver
.NewTransformFeedback(ctx
, 0);
135 assert(ctx
->TransformFeedback
.DefaultObject
->RefCount
== 1);
137 reference_transform_feedback_object(&ctx
->TransformFeedback
.CurrentObject
,
138 ctx
->TransformFeedback
.DefaultObject
);
140 assert(ctx
->TransformFeedback
.DefaultObject
->RefCount
== 2);
142 ctx
->TransformFeedback
.Objects
= _mesa_NewHashTable();
144 _mesa_reference_buffer_object(ctx
,
145 &ctx
->TransformFeedback
.CurrentBuffer
,
146 ctx
->Shared
->NullBufferObj
);
152 * Callback for _mesa_HashDeleteAll().
155 delete_cb(GLuint key
, void *data
, void *userData
)
157 struct gl_context
*ctx
= (struct gl_context
*) userData
;
158 struct gl_transform_feedback_object
*obj
=
159 (struct gl_transform_feedback_object
*) data
;
161 ctx
->Driver
.DeleteTransformFeedback(ctx
, obj
);
166 * Per-context free/clean-up for transform feedback.
169 _mesa_free_transform_feedback(struct gl_context
*ctx
)
171 /* core mesa expects this, even a dummy one, to be available */
172 assert(ctx
->Driver
.NewTransformFeedback
);
174 _mesa_reference_buffer_object(ctx
,
175 &ctx
->TransformFeedback
.CurrentBuffer
,
178 /* Delete all feedback objects */
179 _mesa_HashDeleteAll(ctx
->TransformFeedback
.Objects
, delete_cb
, ctx
);
180 _mesa_DeleteHashTable(ctx
->TransformFeedback
.Objects
);
182 /* Delete the default feedback object */
183 assert(ctx
->Driver
.DeleteTransformFeedback
);
184 ctx
->Driver
.DeleteTransformFeedback(ctx
,
185 ctx
->TransformFeedback
.DefaultObject
);
187 ctx
->TransformFeedback
.CurrentObject
= NULL
;
191 /** Initialize the fields of a gl_transform_feedback_object. */
193 _mesa_init_transform_feedback_object(struct gl_transform_feedback_object
*obj
,
198 obj
->EverBound
= GL_FALSE
;
202 /** Default fallback for ctx->Driver.NewTransformFeedback() */
203 static struct gl_transform_feedback_object
*
204 new_transform_feedback_fallback(struct gl_context
*ctx
, GLuint name
)
206 struct gl_transform_feedback_object
*obj
;
208 obj
= CALLOC_STRUCT(gl_transform_feedback_object
);
212 _mesa_init_transform_feedback_object(obj
, name
);
216 /** Default fallback for ctx->Driver.DeleteTransformFeedback() */
218 delete_transform_feedback_fallback(struct gl_context
*ctx
,
219 struct gl_transform_feedback_object
*obj
)
223 for (i
= 0; i
< ARRAY_SIZE(obj
->Buffers
); i
++) {
224 _mesa_reference_buffer_object(ctx
, &obj
->Buffers
[i
], NULL
);
232 /** Default fallback for ctx->Driver.BeginTransformFeedback() */
234 begin_transform_feedback_fallback(struct gl_context
*ctx
, GLenum mode
,
235 struct gl_transform_feedback_object
*obj
)
240 /** Default fallback for ctx->Driver.EndTransformFeedback() */
242 end_transform_feedback_fallback(struct gl_context
*ctx
,
243 struct gl_transform_feedback_object
*obj
)
248 /** Default fallback for ctx->Driver.PauseTransformFeedback() */
250 pause_transform_feedback_fallback(struct gl_context
*ctx
,
251 struct gl_transform_feedback_object
*obj
)
256 /** Default fallback for ctx->Driver.ResumeTransformFeedback() */
258 resume_transform_feedback_fallback(struct gl_context
*ctx
,
259 struct gl_transform_feedback_object
*obj
)
266 * Plug in default device driver functions for transform feedback.
267 * Most drivers will override some/all of these.
270 _mesa_init_transform_feedback_functions(struct dd_function_table
*driver
)
272 driver
->NewTransformFeedback
= new_transform_feedback_fallback
;
273 driver
->DeleteTransformFeedback
= delete_transform_feedback_fallback
;
274 driver
->BeginTransformFeedback
= begin_transform_feedback_fallback
;
275 driver
->EndTransformFeedback
= end_transform_feedback_fallback
;
276 driver
->PauseTransformFeedback
= pause_transform_feedback_fallback
;
277 driver
->ResumeTransformFeedback
= resume_transform_feedback_fallback
;
282 * Fill in the correct Size value for each buffer in \c obj.
284 * From the GL 4.3 spec, section 6.1.1 ("Binding Buffer Objects to Indexed
287 * BindBufferBase binds the entire buffer, even when the size of the buffer
288 * is changed after the binding is established. It is equivalent to calling
289 * BindBufferRange with offset zero, while size is determined by the size of
290 * the bound buffer at the time the binding is used.
292 * Regardless of the size specified with BindBufferRange, or indirectly with
293 * BindBufferBase, the GL will never read or write beyond the end of a bound
294 * buffer. In some cases this constraint may result in visibly different
295 * behavior when a buffer overflow would otherwise result, such as described
296 * for transform feedback operations in section 13.2.2.
299 compute_transform_feedback_buffer_sizes(
300 struct gl_transform_feedback_object
*obj
)
303 for (i
= 0; i
< MAX_FEEDBACK_BUFFERS
; ++i
) {
304 GLintptr offset
= obj
->Offset
[i
];
305 GLsizeiptr buffer_size
306 = obj
->Buffers
[i
] == NULL
? 0 : obj
->Buffers
[i
]->Size
;
307 GLsizeiptr available_space
308 = buffer_size
<= offset
? 0 : buffer_size
- offset
;
309 GLsizeiptr computed_size
;
310 if (obj
->RequestedSize
[i
] == 0) {
311 /* No size was specified at the time the buffer was bound, so allow
312 * writing to all available space in the buffer.
314 computed_size
= available_space
;
316 /* A size was specified at the time the buffer was bound, however
317 * it's possible that the buffer has shrunk since then. So only
318 * allow writing to the minimum of the specified size and the space
321 computed_size
= MIN2(available_space
, obj
->RequestedSize
[i
]);
324 /* Legal sizes must be multiples of four, so round down if necessary. */
325 obj
->Size
[i
] = computed_size
& ~0x3;
331 * Compute the maximum number of vertices that can be written to the currently
332 * enabled transform feedback buffers without overflowing any of them.
335 _mesa_compute_max_transform_feedback_vertices(struct gl_context
*ctx
,
336 const struct gl_transform_feedback_object
*obj
,
337 const struct gl_transform_feedback_info
*info
)
339 unsigned max_index
= 0xffffffff;
342 for (i
= 0; i
< ctx
->Const
.MaxTransformFeedbackBuffers
; i
++) {
343 if ((info
->ActiveBuffers
>> i
) & 1) {
344 unsigned stride
= info
->Buffers
[i
].Stride
;
345 unsigned max_for_this_buffer
;
347 /* Skip any inactive buffers, which have a stride of 0. */
351 max_for_this_buffer
= obj
->Size
[i
] / (4 * stride
);
352 max_index
= MIN2(max_index
, max_for_this_buffer
);
361 ** Begin API functions
366 * Figure out which stage of the pipeline is the source of transform feedback
367 * data given the current context state, and return its gl_program.
369 * If no active program can generate transform feedback data (i.e. no vertex
370 * shader is active), returns NULL.
372 static struct gl_program
*
373 get_xfb_source(struct gl_context
*ctx
)
376 for (i
= MESA_SHADER_GEOMETRY
; i
>= MESA_SHADER_VERTEX
; i
--) {
377 if (ctx
->_Shader
->CurrentProgram
[i
] != NULL
)
378 return ctx
->_Shader
->CurrentProgram
[i
];
384 static ALWAYS_INLINE
void
385 begin_transform_feedback(struct gl_context
*ctx
, GLenum mode
, bool no_error
)
387 struct gl_transform_feedback_object
*obj
;
388 struct gl_transform_feedback_info
*info
= NULL
;
389 struct gl_program
*source
;
391 unsigned vertices_per_prim
;
393 obj
= ctx
->TransformFeedback
.CurrentObject
;
395 /* Figure out what pipeline stage is the source of data for transform
398 source
= get_xfb_source(ctx
);
399 if (!no_error
&& source
== NULL
) {
400 _mesa_error(ctx
, GL_INVALID_OPERATION
,
401 "glBeginTransformFeedback(no program active)");
405 info
= source
->sh
.LinkedTransformFeedback
;
407 if (!no_error
&& info
->NumOutputs
== 0) {
408 _mesa_error(ctx
, GL_INVALID_OPERATION
,
409 "glBeginTransformFeedback(no varyings to record)");
415 vertices_per_prim
= 1;
418 vertices_per_prim
= 2;
421 vertices_per_prim
= 3;
425 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBeginTransformFeedback(mode)");
428 /* Stop compiler warnings */
429 unreachable("Error in API use when using KHR_no_error");
435 _mesa_error(ctx
, GL_INVALID_OPERATION
,
436 "glBeginTransformFeedback(already active)");
440 for (i
= 0; i
< ctx
->Const
.MaxTransformFeedbackBuffers
; i
++) {
441 if ((info
->ActiveBuffers
>> i
) & 1) {
442 if (obj
->BufferNames
[i
] == 0) {
443 _mesa_error(ctx
, GL_INVALID_OPERATION
,
444 "glBeginTransformFeedback(binding point %d does not "
445 "have a buffer object bound)", i
);
452 FLUSH_VERTICES(ctx
, 0);
453 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
455 obj
->Active
= GL_TRUE
;
456 ctx
->TransformFeedback
.Mode
= mode
;
458 compute_transform_feedback_buffer_sizes(obj
);
460 if (_mesa_is_gles3(ctx
)) {
461 /* In GLES3, we are required to track the usage of the transform
462 * feedback buffer and report INVALID_OPERATION if a draw call tries to
463 * exceed it. So compute the maximum number of vertices that we can
464 * write without overflowing any of the buffers currently being used for
467 unsigned max_vertices
468 = _mesa_compute_max_transform_feedback_vertices(ctx
, obj
, info
);
469 obj
->GlesRemainingPrims
= max_vertices
/ vertices_per_prim
;
472 if (obj
->program
!= source
) {
473 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedbackProg
;
474 obj
->program
= source
;
477 assert(ctx
->Driver
.BeginTransformFeedback
);
478 ctx
->Driver
.BeginTransformFeedback(ctx
, mode
, obj
);
483 _mesa_BeginTransformFeedback_no_error(GLenum mode
)
485 GET_CURRENT_CONTEXT(ctx
);
486 begin_transform_feedback(ctx
, mode
, true);
491 _mesa_BeginTransformFeedback(GLenum mode
)
493 GET_CURRENT_CONTEXT(ctx
);
494 begin_transform_feedback(ctx
, mode
, false);
499 end_transform_feedback(struct gl_context
*ctx
,
500 struct gl_transform_feedback_object
*obj
)
502 FLUSH_VERTICES(ctx
, 0);
503 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
505 assert(ctx
->Driver
.EndTransformFeedback
);
506 ctx
->Driver
.EndTransformFeedback(ctx
, obj
);
508 ctx
->TransformFeedback
.CurrentObject
->Active
= GL_FALSE
;
509 ctx
->TransformFeedback
.CurrentObject
->Paused
= GL_FALSE
;
510 ctx
->TransformFeedback
.CurrentObject
->EndedAnytime
= GL_TRUE
;
515 _mesa_EndTransformFeedback_no_error(void)
517 GET_CURRENT_CONTEXT(ctx
);
518 end_transform_feedback(ctx
, ctx
->TransformFeedback
.CurrentObject
);
523 _mesa_EndTransformFeedback(void)
525 struct gl_transform_feedback_object
*obj
;
526 GET_CURRENT_CONTEXT(ctx
);
528 obj
= ctx
->TransformFeedback
.CurrentObject
;
531 _mesa_error(ctx
, GL_INVALID_OPERATION
,
532 "glEndTransformFeedback(not active)");
536 end_transform_feedback(ctx
, obj
);
541 * Helper used by BindBufferRange() and BindBufferBase().
544 bind_buffer_range(struct gl_context
*ctx
,
545 struct gl_transform_feedback_object
*obj
,
547 struct gl_buffer_object
*bufObj
,
548 GLintptr offset
, GLsizeiptr size
,
551 /* Note: no need to FLUSH_VERTICES or flag NewTransformFeedback, because
552 * transform feedback buffers can't be changed while transform feedback is
557 /* The general binding point */
558 _mesa_reference_buffer_object(ctx
,
559 &ctx
->TransformFeedback
.CurrentBuffer
,
563 /* The per-attribute binding point */
564 _mesa_set_transform_feedback_binding(ctx
, obj
, index
, bufObj
, offset
, size
);
569 * Validate the buffer object to receive transform feedback results. Plus,
570 * validate the starting offset to place the results, and max size.
571 * Called from the glBindBufferRange() and glTransformFeedbackBufferRange
575 _mesa_validate_buffer_range_xfb(struct gl_context
*ctx
,
576 struct gl_transform_feedback_object
*obj
,
577 GLuint index
, struct gl_buffer_object
*bufObj
,
578 GLintptr offset
, GLsizeiptr size
, bool dsa
)
580 const char *gl_methd_name
;
582 gl_methd_name
= "glTransformFeedbackBufferRange";
584 gl_methd_name
= "glBindBufferRange";
588 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(transform feedback active)",
593 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
594 /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
595 * generated if index is greater than or equal to the number of binding
596 * points for transform feedback, as described in section 6.7.1."
598 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(index=%d out of bounds)",
599 gl_methd_name
, index
);
604 /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
605 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(size=%d must be a multiple of "
606 "four)", gl_methd_name
, (int) size
);
611 /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
612 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(offset=%d must be a multiple "
613 "of four)", gl_methd_name
, (int) offset
);
618 /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
619 * generated by BindBufferRange if offset is negative."
621 * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
622 * is generated by TransformFeedbackBufferRange if offset is negative."
624 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(offset=%d must be >= 0)",
630 if (size
<= 0 && (dsa
|| bufObj
!= ctx
->Shared
->NullBufferObj
)) {
631 /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
632 * generated by BindBufferRange if buffer is non-zero and size is less
633 * than or equal to zero."
635 * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
636 * is generated by TransformFeedbackBufferRange if size is less than or
639 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(size=%d must be > 0)",
640 gl_methd_name
, (int) size
);
649 * Specify a buffer object to receive transform feedback results.
650 * As above, but start at offset = 0.
651 * Called from the glBindBufferBase() and glTransformFeedbackBufferBase()
655 _mesa_bind_buffer_base_transform_feedback(struct gl_context
*ctx
,
656 struct gl_transform_feedback_object
*obj
,
658 struct gl_buffer_object
*bufObj
,
662 _mesa_error(ctx
, GL_INVALID_OPERATION
,
663 "%s(transform feedback active)",
664 dsa
? "glTransformFeedbackBufferBase" : "glBindBufferBase");
668 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
669 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(index=%d out of bounds)",
670 dsa
? "glTransformFeedbackBufferBase" : "glBindBufferBase",
675 bind_buffer_range(ctx
, obj
, index
, bufObj
, 0, 0, dsa
);
679 * Wrapper around lookup_transform_feedback_object that throws
680 * GL_INVALID_OPERATION if id is not in the hash table. After calling
681 * _mesa_error, it returns NULL.
683 static struct gl_transform_feedback_object
*
684 lookup_transform_feedback_object_err(struct gl_context
*ctx
,
685 GLuint xfb
, const char* func
)
687 struct gl_transform_feedback_object
*obj
;
689 obj
= _mesa_lookup_transform_feedback_object(ctx
, xfb
);
691 _mesa_error(ctx
, GL_INVALID_OPERATION
,
692 "%s(xfb=%u: non-generated object name)", func
, xfb
);
699 * Wrapper around _mesa_lookup_bufferobj that throws GL_INVALID_VALUE if id
700 * is not in the hash table. Specialised version for the
701 * transform-feedback-related functions. After calling _mesa_error, it
704 static struct gl_buffer_object
*
705 lookup_transform_feedback_bufferobj_err(struct gl_context
*ctx
,
706 GLuint buffer
, const char* func
)
708 struct gl_buffer_object
*bufObj
;
710 /* OpenGL 4.5 core profile, 13.2, pdf page 444: buffer must be zero or the
711 * name of an existing buffer object.
714 bufObj
= ctx
->Shared
->NullBufferObj
;
716 bufObj
= _mesa_lookup_bufferobj(ctx
, buffer
);
718 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(invalid buffer=%u)", func
,
727 _mesa_TransformFeedbackBufferBase(GLuint xfb
, GLuint index
, GLuint buffer
)
729 GET_CURRENT_CONTEXT(ctx
);
730 struct gl_transform_feedback_object
*obj
;
731 struct gl_buffer_object
*bufObj
;
733 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
734 "glTransformFeedbackBufferBase");
739 bufObj
= lookup_transform_feedback_bufferobj_err(ctx
, buffer
,
740 "glTransformFeedbackBufferBase");
745 _mesa_bind_buffer_base_transform_feedback(ctx
, obj
, index
, bufObj
, true);
749 _mesa_TransformFeedbackBufferRange(GLuint xfb
, GLuint index
, GLuint buffer
,
750 GLintptr offset
, GLsizeiptr size
)
752 GET_CURRENT_CONTEXT(ctx
);
753 struct gl_transform_feedback_object
*obj
;
754 struct gl_buffer_object
*bufObj
;
756 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
757 "glTransformFeedbackBufferRange");
762 bufObj
= lookup_transform_feedback_bufferobj_err(ctx
, buffer
,
763 "glTransformFeedbackBufferRange");
768 if (!_mesa_validate_buffer_range_xfb(ctx
, obj
, index
, bufObj
, offset
,
772 /* The per-attribute binding point */
773 _mesa_set_transform_feedback_binding(ctx
, obj
, index
, bufObj
, offset
,
778 * Specify a buffer object to receive transform feedback results, plus the
779 * offset in the buffer to start placing results.
780 * This function is part of GL_EXT_transform_feedback, but not GL3.
782 static ALWAYS_INLINE
void
783 bind_buffer_offset(struct gl_context
*ctx
,
784 struct gl_transform_feedback_object
*obj
, GLuint index
,
785 GLuint buffer
, GLintptr offset
, bool no_error
)
787 struct gl_buffer_object
*bufObj
;
790 bufObj
= ctx
->Shared
->NullBufferObj
;
792 bufObj
= _mesa_lookup_bufferobj(ctx
, buffer
);
793 if (!no_error
&& !bufObj
) {
794 _mesa_error(ctx
, GL_INVALID_OPERATION
,
795 "glBindBufferOffsetEXT(invalid buffer=%u)", buffer
);
800 _mesa_bind_buffer_range_xfb(ctx
, obj
, index
, bufObj
, offset
, 0);
805 _mesa_BindBufferOffsetEXT_no_error(GLenum target
, GLuint index
, GLuint buffer
,
808 GET_CURRENT_CONTEXT(ctx
);
809 bind_buffer_offset(ctx
, ctx
->TransformFeedback
.CurrentObject
, index
, buffer
,
815 _mesa_BindBufferOffsetEXT(GLenum target
, GLuint index
, GLuint buffer
,
818 struct gl_transform_feedback_object
*obj
;
819 GET_CURRENT_CONTEXT(ctx
);
821 if (target
!= GL_TRANSFORM_FEEDBACK_BUFFER
) {
822 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBindBufferOffsetEXT(target)");
826 obj
= ctx
->TransformFeedback
.CurrentObject
;
829 _mesa_error(ctx
, GL_INVALID_OPERATION
,
830 "glBindBufferOffsetEXT(transform feedback active)");
834 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
835 _mesa_error(ctx
, GL_INVALID_VALUE
,
836 "glBindBufferOffsetEXT(index=%d)", index
);
841 /* must be multiple of four */
842 _mesa_error(ctx
, GL_INVALID_VALUE
,
843 "glBindBufferOffsetEXT(offset=%d)", (int) offset
);
847 bind_buffer_offset(ctx
, obj
, index
, buffer
, offset
, false);
852 * This function specifies the transform feedback outputs to be written
853 * to the feedback buffer(s), and in what order.
855 static ALWAYS_INLINE
void
856 transform_feedback_varyings(struct gl_context
*ctx
,
857 struct gl_shader_program
*shProg
, GLsizei count
,
858 const GLchar
*const *varyings
, GLenum bufferMode
)
862 /* free existing varyings, if any */
863 for (i
= 0; i
< (GLint
) shProg
->TransformFeedback
.NumVarying
; i
++) {
864 free(shProg
->TransformFeedback
.VaryingNames
[i
]);
866 free(shProg
->TransformFeedback
.VaryingNames
);
868 /* allocate new memory for varying names */
869 shProg
->TransformFeedback
.VaryingNames
=
870 malloc(count
* sizeof(GLchar
*));
872 if (!shProg
->TransformFeedback
.VaryingNames
) {
873 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glTransformFeedbackVaryings()");
877 /* Save the new names and the count */
878 for (i
= 0; i
< count
; i
++) {
879 shProg
->TransformFeedback
.VaryingNames
[i
] = strdup(varyings
[i
]);
881 shProg
->TransformFeedback
.NumVarying
= count
;
883 shProg
->TransformFeedback
.BufferMode
= bufferMode
;
885 /* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since
886 * the varyings won't be used until shader link time.
892 _mesa_TransformFeedbackVaryings_no_error(GLuint program
, GLsizei count
,
893 const GLchar
*const *varyings
,
896 GET_CURRENT_CONTEXT(ctx
);
898 struct gl_shader_program
*shProg
= _mesa_lookup_shader_program(ctx
, program
);
899 transform_feedback_varyings(ctx
, shProg
, count
, varyings
, bufferMode
);
903 _mesa_TransformFeedbackVaryings(GLuint program
, GLsizei count
,
904 const GLchar
* const *varyings
,
907 struct gl_shader_program
*shProg
;
909 GET_CURRENT_CONTEXT(ctx
);
911 /* From the ARB_transform_feedback2 specification:
912 * "The error INVALID_OPERATION is generated by TransformFeedbackVaryings
913 * if the current transform feedback object is active, even if paused."
915 if (ctx
->TransformFeedback
.CurrentObject
->Active
) {
916 _mesa_error(ctx
, GL_INVALID_OPERATION
,
917 "glTransformFeedbackVaryings(current object is active)");
921 switch (bufferMode
) {
922 case GL_INTERLEAVED_ATTRIBS
:
924 case GL_SEPARATE_ATTRIBS
:
927 _mesa_error(ctx
, GL_INVALID_ENUM
,
928 "glTransformFeedbackVaryings(bufferMode)");
933 (bufferMode
== GL_SEPARATE_ATTRIBS
&&
934 (GLuint
) count
> ctx
->Const
.MaxTransformFeedbackBuffers
)) {
935 _mesa_error(ctx
, GL_INVALID_VALUE
,
936 "glTransformFeedbackVaryings(count=%d)", count
);
940 shProg
= _mesa_lookup_shader_program_err(ctx
, program
,
941 "glTransformFeedbackVaryings");
945 if (ctx
->Extensions
.ARB_transform_feedback3
) {
946 if (bufferMode
== GL_INTERLEAVED_ATTRIBS
) {
947 unsigned buffers
= 1;
949 for (i
= 0; i
< count
; i
++) {
950 if (strcmp(varyings
[i
], "gl_NextBuffer") == 0)
954 if (buffers
> ctx
->Const
.MaxTransformFeedbackBuffers
) {
955 _mesa_error(ctx
, GL_INVALID_OPERATION
,
956 "glTransformFeedbackVaryings(too many gl_NextBuffer "
961 for (i
= 0; i
< count
; i
++) {
962 if (strcmp(varyings
[i
], "gl_NextBuffer") == 0 ||
963 strcmp(varyings
[i
], "gl_SkipComponents1") == 0 ||
964 strcmp(varyings
[i
], "gl_SkipComponents2") == 0 ||
965 strcmp(varyings
[i
], "gl_SkipComponents3") == 0 ||
966 strcmp(varyings
[i
], "gl_SkipComponents4") == 0) {
967 _mesa_error(ctx
, GL_INVALID_OPERATION
,
968 "glTransformFeedbackVaryings(SEPARATE_ATTRIBS,"
977 transform_feedback_varyings(ctx
, shProg
, count
, varyings
, bufferMode
);
982 * Get info about the transform feedback outputs which are to be written
983 * to the feedback buffer(s).
986 _mesa_GetTransformFeedbackVarying(GLuint program
, GLuint index
,
987 GLsizei bufSize
, GLsizei
*length
,
988 GLsizei
*size
, GLenum
*type
, GLchar
*name
)
990 const struct gl_shader_program
*shProg
;
991 struct gl_program_resource
*res
;
992 GET_CURRENT_CONTEXT(ctx
);
994 shProg
= _mesa_lookup_shader_program_err(ctx
, program
,
995 "glGetTransformFeedbackVarying");
999 res
= _mesa_program_resource_find_index((struct gl_shader_program
*) shProg
,
1000 GL_TRANSFORM_FEEDBACK_VARYING
,
1003 _mesa_error(ctx
, GL_INVALID_VALUE
,
1004 "glGetTransformFeedbackVarying(index=%u)", index
);
1008 /* return the varying's name and length */
1009 _mesa_copy_string(name
, bufSize
, length
, _mesa_program_resource_name(res
));
1011 /* return the datatype and value's size (in datatype units) */
1013 _mesa_program_resource_prop((struct gl_shader_program
*) shProg
,
1014 res
, index
, GL_TYPE
, (GLint
*) type
,
1015 "glGetTransformFeedbackVarying");
1017 _mesa_program_resource_prop((struct gl_shader_program
*) shProg
,
1018 res
, index
, GL_ARRAY_SIZE
, (GLint
*) size
,
1019 "glGetTransformFeedbackVarying");
1024 struct gl_transform_feedback_object
*
1025 _mesa_lookup_transform_feedback_object(struct gl_context
*ctx
, GLuint name
)
1027 /* OpenGL 4.5 core profile, 13.2 pdf page 444: "xfb must be zero, indicating
1028 * the default transform feedback object, or the name of an existing
1029 * transform feedback object."
1032 return ctx
->TransformFeedback
.DefaultObject
;
1035 return (struct gl_transform_feedback_object
*)
1036 _mesa_HashLookupLocked(ctx
->TransformFeedback
.Objects
, name
);
1040 create_transform_feedbacks(struct gl_context
*ctx
, GLsizei n
, GLuint
*ids
,
1047 func
= "glCreateTransformFeedbacks";
1049 func
= "glGenTransformFeedbacks";
1052 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(n < 0)", func
);
1059 /* we don't need contiguous IDs, but this might be faster */
1060 first
= _mesa_HashFindFreeKeyBlock(ctx
->TransformFeedback
.Objects
, n
);
1063 for (i
= 0; i
< n
; i
++) {
1064 struct gl_transform_feedback_object
*obj
1065 = ctx
->Driver
.NewTransformFeedback(ctx
, first
+ i
);
1067 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "%s", func
);
1071 _mesa_HashInsertLocked(ctx
->TransformFeedback
.Objects
, first
+ i
,
1074 /* this is normally done at bind time in the non-dsa case */
1075 obj
->EverBound
= GL_TRUE
;
1080 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "%s", func
);
1085 * Create new transform feedback objects. Transform feedback objects
1086 * encapsulate the state related to transform feedback to allow quickly
1087 * switching state (and drawing the results, below).
1088 * Part of GL_ARB_transform_feedback2.
1091 _mesa_GenTransformFeedbacks(GLsizei n
, GLuint
*names
)
1093 GET_CURRENT_CONTEXT(ctx
);
1095 /* GenTransformFeedbacks should just reserve the object names that a
1096 * subsequent call to BindTransformFeedback should actively create. For
1097 * the sake of simplicity, we reserve the names and create the objects
1101 create_transform_feedbacks(ctx
, n
, names
, false);
1105 * Create new transform feedback objects. Transform feedback objects
1106 * encapsulate the state related to transform feedback to allow quickly
1107 * switching state (and drawing the results, below).
1108 * Part of GL_ARB_direct_state_access.
1111 _mesa_CreateTransformFeedbacks(GLsizei n
, GLuint
*names
)
1113 GET_CURRENT_CONTEXT(ctx
);
1115 create_transform_feedbacks(ctx
, n
, names
, true);
1120 * Is the given ID a transform feedback object?
1121 * Part of GL_ARB_transform_feedback2.
1123 GLboolean GLAPIENTRY
1124 _mesa_IsTransformFeedback(GLuint name
)
1126 struct gl_transform_feedback_object
*obj
;
1127 GET_CURRENT_CONTEXT(ctx
);
1129 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
1134 obj
= _mesa_lookup_transform_feedback_object(ctx
, name
);
1138 return obj
->EverBound
;
1143 * Bind the given transform feedback object.
1144 * Part of GL_ARB_transform_feedback2.
1146 static ALWAYS_INLINE
void
1147 bind_transform_feedback(struct gl_context
*ctx
, GLuint name
, bool no_error
)
1149 struct gl_transform_feedback_object
*obj
;
1151 obj
= _mesa_lookup_transform_feedback_object(ctx
, name
);
1152 if (!no_error
&& !obj
) {
1153 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1154 "glBindTransformFeedback(name=%u)", name
);
1158 reference_transform_feedback_object(&ctx
->TransformFeedback
.CurrentObject
,
1164 _mesa_BindTransformFeedback_no_error(GLenum target
, GLuint name
)
1166 GET_CURRENT_CONTEXT(ctx
);
1167 bind_transform_feedback(ctx
, name
, true);
1172 _mesa_BindTransformFeedback(GLenum target
, GLuint name
)
1174 GET_CURRENT_CONTEXT(ctx
);
1176 if (target
!= GL_TRANSFORM_FEEDBACK
) {
1177 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBindTransformFeedback(target)");
1181 if (_mesa_is_xfb_active_and_unpaused(ctx
)) {
1182 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1183 "glBindTransformFeedback(transform is active, or not paused)");
1187 bind_transform_feedback(ctx
, name
, false);
1192 * Delete the given transform feedback objects.
1193 * Part of GL_ARB_transform_feedback2.
1196 _mesa_DeleteTransformFeedbacks(GLsizei n
, const GLuint
*names
)
1199 GET_CURRENT_CONTEXT(ctx
);
1202 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDeleteTransformFeedbacks(n < 0)");
1209 for (i
= 0; i
< n
; i
++) {
1211 struct gl_transform_feedback_object
*obj
1212 = _mesa_lookup_transform_feedback_object(ctx
, names
[i
]);
1215 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1216 "glDeleteTransformFeedbacks(object %u is active)",
1220 _mesa_HashRemoveLocked(ctx
->TransformFeedback
.Objects
, names
[i
]);
1221 /* unref, but object may not be deleted until later */
1222 if (obj
== ctx
->TransformFeedback
.CurrentObject
) {
1223 reference_transform_feedback_object(
1224 &ctx
->TransformFeedback
.CurrentObject
,
1225 ctx
->TransformFeedback
.DefaultObject
);
1227 reference_transform_feedback_object(&obj
, NULL
);
1235 * Pause transform feedback.
1236 * Part of GL_ARB_transform_feedback2.
1239 pause_transform_feedback(struct gl_context
*ctx
,
1240 struct gl_transform_feedback_object
*obj
)
1242 FLUSH_VERTICES(ctx
, 0);
1243 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
1245 assert(ctx
->Driver
.PauseTransformFeedback
);
1246 ctx
->Driver
.PauseTransformFeedback(ctx
, obj
);
1248 obj
->Paused
= GL_TRUE
;
1253 _mesa_PauseTransformFeedback_no_error(void)
1255 GET_CURRENT_CONTEXT(ctx
);
1256 pause_transform_feedback(ctx
, ctx
->TransformFeedback
.CurrentObject
);
1261 _mesa_PauseTransformFeedback(void)
1263 struct gl_transform_feedback_object
*obj
;
1264 GET_CURRENT_CONTEXT(ctx
);
1266 obj
= ctx
->TransformFeedback
.CurrentObject
;
1268 if (!_mesa_is_xfb_active_and_unpaused(ctx
)) {
1269 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1270 "glPauseTransformFeedback(feedback not active or already paused)");
1274 pause_transform_feedback(ctx
, obj
);
1279 * Resume transform feedback.
1280 * Part of GL_ARB_transform_feedback2.
1283 resume_transform_feedback(struct gl_context
*ctx
,
1284 struct gl_transform_feedback_object
*obj
)
1286 FLUSH_VERTICES(ctx
, 0);
1287 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
1289 obj
->Paused
= GL_FALSE
;
1291 assert(ctx
->Driver
.ResumeTransformFeedback
);
1292 ctx
->Driver
.ResumeTransformFeedback(ctx
, obj
);
1297 _mesa_ResumeTransformFeedback_no_error(void)
1299 GET_CURRENT_CONTEXT(ctx
);
1300 resume_transform_feedback(ctx
, ctx
->TransformFeedback
.CurrentObject
);
1305 _mesa_ResumeTransformFeedback(void)
1307 struct gl_transform_feedback_object
*obj
;
1308 GET_CURRENT_CONTEXT(ctx
);
1310 obj
= ctx
->TransformFeedback
.CurrentObject
;
1312 if (!obj
->Active
|| !obj
->Paused
) {
1313 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1314 "glResumeTransformFeedback(feedback not active or not paused)");
1318 /* From the ARB_transform_feedback2 specification:
1319 * "The error INVALID_OPERATION is generated by ResumeTransformFeedback if
1320 * the program object being used by the current transform feedback object
1323 if (obj
->program
!= get_xfb_source(ctx
)) {
1324 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1325 "glResumeTransformFeedback(wrong program bound)");
1329 resume_transform_feedback(ctx
, obj
);
1332 extern void GLAPIENTRY
1333 _mesa_GetTransformFeedbackiv(GLuint xfb
, GLenum pname
, GLint
*param
)
1335 struct gl_transform_feedback_object
*obj
;
1336 GET_CURRENT_CONTEXT(ctx
);
1338 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
1339 "glGetTransformFeedbackiv");
1345 case GL_TRANSFORM_FEEDBACK_PAUSED
:
1346 *param
= obj
->Paused
;
1348 case GL_TRANSFORM_FEEDBACK_ACTIVE
:
1349 *param
= obj
->Active
;
1352 _mesa_error(ctx
, GL_INVALID_ENUM
,
1353 "glGetTransformFeedbackiv(pname=%i)", pname
);
1357 extern void GLAPIENTRY
1358 _mesa_GetTransformFeedbacki_v(GLuint xfb
, GLenum pname
, GLuint index
,
1361 struct gl_transform_feedback_object
*obj
;
1362 GET_CURRENT_CONTEXT(ctx
);
1364 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
1365 "glGetTransformFeedbacki_v");
1370 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
1371 _mesa_error(ctx
, GL_INVALID_VALUE
,
1372 "glGetTransformFeedbacki_v(index=%i)", index
);
1377 case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING
:
1378 *param
= obj
->BufferNames
[index
];
1381 _mesa_error(ctx
, GL_INVALID_ENUM
,
1382 "glGetTransformFeedbacki_v(pname=%i)", pname
);
1386 extern void GLAPIENTRY
1387 _mesa_GetTransformFeedbacki64_v(GLuint xfb
, GLenum pname
, GLuint index
,
1390 struct gl_transform_feedback_object
*obj
;
1391 GET_CURRENT_CONTEXT(ctx
);
1393 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
1394 "glGetTransformFeedbacki64_v");
1399 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
1400 _mesa_error(ctx
, GL_INVALID_VALUE
,
1401 "glGetTransformFeedbacki64_v(index=%i)", index
);
1406 * This follows the same general rules used for BindBufferBase:
1408 * "To query the starting offset or size of the range of a buffer
1409 * object binding in an indexed array, call GetInteger64i_v with
1410 * target set to respectively the starting offset or binding size
1411 * name from table 6.5 for that array. Index must be in the range
1412 * zero to the number of bind points supported minus one. If the
1413 * starting offset or size was not specified when the buffer object
1414 * was bound (e.g. if it was bound with BindBufferBase), or if no
1415 * buffer object is bound to the target array at index, zero is
1418 if (obj
->RequestedSize
[index
] == 0 &&
1419 (pname
== GL_TRANSFORM_FEEDBACK_BUFFER_START
||
1420 pname
== GL_TRANSFORM_FEEDBACK_BUFFER_SIZE
)) {
1425 compute_transform_feedback_buffer_sizes(obj
);
1427 case GL_TRANSFORM_FEEDBACK_BUFFER_START
:
1428 assert(obj
->RequestedSize
[index
] > 0);
1429 *param
= obj
->Offset
[index
];
1431 case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE
:
1432 assert(obj
->RequestedSize
[index
] > 0);
1433 *param
= obj
->Size
[index
];
1436 _mesa_error(ctx
, GL_INVALID_ENUM
,
1437 "glGetTransformFeedbacki64_v(pname=%i)", pname
);