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 * Check that all the buffer objects currently bound for transform
125 * feedback actually exist. Raise a GL_INVALID_OPERATION error if
126 * any buffers are missing.
127 * \return GL_TRUE for success, GL_FALSE if error
130 _mesa_validate_transform_feedback_buffers(struct gl_context
*ctx
)
139 * Per-context init for transform feedback.
142 _mesa_init_transform_feedback(struct gl_context
*ctx
)
144 /* core mesa expects this, even a dummy one, to be available */
145 assert(ctx
->Driver
.NewTransformFeedback
);
147 ctx
->TransformFeedback
.DefaultObject
=
148 ctx
->Driver
.NewTransformFeedback(ctx
, 0);
150 assert(ctx
->TransformFeedback
.DefaultObject
->RefCount
== 1);
152 reference_transform_feedback_object(&ctx
->TransformFeedback
.CurrentObject
,
153 ctx
->TransformFeedback
.DefaultObject
);
155 assert(ctx
->TransformFeedback
.DefaultObject
->RefCount
== 2);
157 ctx
->TransformFeedback
.Objects
= _mesa_NewHashTable();
159 _mesa_reference_buffer_object(ctx
,
160 &ctx
->TransformFeedback
.CurrentBuffer
,
161 ctx
->Shared
->NullBufferObj
);
167 * Callback for _mesa_HashDeleteAll().
170 delete_cb(GLuint key
, void *data
, void *userData
)
172 struct gl_context
*ctx
= (struct gl_context
*) userData
;
173 struct gl_transform_feedback_object
*obj
=
174 (struct gl_transform_feedback_object
*) data
;
176 ctx
->Driver
.DeleteTransformFeedback(ctx
, obj
);
181 * Per-context free/clean-up for transform feedback.
184 _mesa_free_transform_feedback(struct gl_context
*ctx
)
186 /* core mesa expects this, even a dummy one, to be available */
187 assert(ctx
->Driver
.NewTransformFeedback
);
189 _mesa_reference_buffer_object(ctx
,
190 &ctx
->TransformFeedback
.CurrentBuffer
,
193 /* Delete all feedback objects */
194 _mesa_HashDeleteAll(ctx
->TransformFeedback
.Objects
, delete_cb
, ctx
);
195 _mesa_DeleteHashTable(ctx
->TransformFeedback
.Objects
);
197 /* Delete the default feedback object */
198 assert(ctx
->Driver
.DeleteTransformFeedback
);
199 ctx
->Driver
.DeleteTransformFeedback(ctx
,
200 ctx
->TransformFeedback
.DefaultObject
);
202 ctx
->TransformFeedback
.CurrentObject
= NULL
;
206 /** Initialize the fields of a gl_transform_feedback_object. */
208 _mesa_init_transform_feedback_object(struct gl_transform_feedback_object
*obj
,
216 obj
->EverBound
= GL_FALSE
;
220 /** Default fallback for ctx->Driver.NewTransformFeedback() */
221 static struct gl_transform_feedback_object
*
222 new_transform_feedback(struct gl_context
*ctx
, GLuint name
)
224 struct gl_transform_feedback_object
*obj
;
225 obj
= CALLOC_STRUCT(gl_transform_feedback_object
);
226 _mesa_init_transform_feedback_object(obj
, name
);
230 /** Default fallback for ctx->Driver.DeleteTransformFeedback() */
232 delete_transform_feedback(struct gl_context
*ctx
,
233 struct gl_transform_feedback_object
*obj
)
237 for (i
= 0; i
< ARRAY_SIZE(obj
->Buffers
); i
++) {
238 _mesa_reference_buffer_object(ctx
, &obj
->Buffers
[i
], NULL
);
246 /** Default fallback for ctx->Driver.BeginTransformFeedback() */
248 begin_transform_feedback(struct gl_context
*ctx
, GLenum mode
,
249 struct gl_transform_feedback_object
*obj
)
254 /** Default fallback for ctx->Driver.EndTransformFeedback() */
256 end_transform_feedback(struct gl_context
*ctx
,
257 struct gl_transform_feedback_object
*obj
)
262 /** Default fallback for ctx->Driver.PauseTransformFeedback() */
264 pause_transform_feedback(struct gl_context
*ctx
,
265 struct gl_transform_feedback_object
*obj
)
270 /** Default fallback for ctx->Driver.ResumeTransformFeedback() */
272 resume_transform_feedback(struct gl_context
*ctx
,
273 struct gl_transform_feedback_object
*obj
)
280 * Plug in default device driver functions for transform feedback.
281 * Most drivers will override some/all of these.
284 _mesa_init_transform_feedback_functions(struct dd_function_table
*driver
)
286 driver
->NewTransformFeedback
= new_transform_feedback
;
287 driver
->DeleteTransformFeedback
= delete_transform_feedback
;
288 driver
->BeginTransformFeedback
= begin_transform_feedback
;
289 driver
->EndTransformFeedback
= end_transform_feedback
;
290 driver
->PauseTransformFeedback
= pause_transform_feedback
;
291 driver
->ResumeTransformFeedback
= resume_transform_feedback
;
296 * Fill in the correct Size value for each buffer in \c obj.
298 * From the GL 4.3 spec, section 6.1.1 ("Binding Buffer Objects to Indexed
301 * BindBufferBase binds the entire buffer, even when the size of the buffer
302 * is changed after the binding is established. It is equivalent to calling
303 * BindBufferRange with offset zero, while size is determined by the size of
304 * the bound buffer at the time the binding is used.
306 * Regardless of the size specified with BindBufferRange, or indirectly with
307 * BindBufferBase, the GL will never read or write beyond the end of a bound
308 * buffer. In some cases this constraint may result in visibly different
309 * behavior when a buffer overflow would otherwise result, such as described
310 * for transform feedback operations in section 13.2.2.
313 compute_transform_feedback_buffer_sizes(
314 struct gl_transform_feedback_object
*obj
)
317 for (i
= 0; i
< MAX_FEEDBACK_BUFFERS
; ++i
) {
318 GLintptr offset
= obj
->Offset
[i
];
319 GLsizeiptr buffer_size
320 = obj
->Buffers
[i
] == NULL
? 0 : obj
->Buffers
[i
]->Size
;
321 GLsizeiptr available_space
322 = buffer_size
<= offset
? 0 : buffer_size
- offset
;
323 GLsizeiptr computed_size
;
324 if (obj
->RequestedSize
[i
] == 0) {
325 /* No size was specified at the time the buffer was bound, so allow
326 * writing to all available space in the buffer.
328 computed_size
= available_space
;
330 /* A size was specified at the time the buffer was bound, however
331 * it's possible that the buffer has shrunk since then. So only
332 * allow writing to the minimum of the specified size and the space
335 computed_size
= MIN2(available_space
, obj
->RequestedSize
[i
]);
338 /* Legal sizes must be multiples of four, so round down if necessary. */
339 obj
->Size
[i
] = computed_size
& ~0x3;
345 * Compute the maximum number of vertices that can be written to the currently
346 * enabled transform feedback buffers without overflowing any of them.
349 _mesa_compute_max_transform_feedback_vertices(struct gl_context
*ctx
,
350 const struct gl_transform_feedback_object
*obj
,
351 const struct gl_transform_feedback_info
*info
)
353 unsigned max_index
= 0xffffffff;
356 for (i
= 0; i
< ctx
->Const
.MaxTransformFeedbackBuffers
; i
++) {
357 if ((info
->ActiveBuffers
>> i
) & 1) {
358 unsigned stride
= info
->Buffers
[i
].Stride
;
359 unsigned max_for_this_buffer
;
361 /* Skip any inactive buffers, which have a stride of 0. */
365 max_for_this_buffer
= obj
->Size
[i
] / (4 * stride
);
366 max_index
= MIN2(max_index
, max_for_this_buffer
);
375 ** Begin API functions
380 * Figure out which stage of the pipeline is the source of transform feedback
381 * data given the current context state, and return its gl_program.
383 * If no active program can generate transform feedback data (i.e. no vertex
384 * shader is active), returns NULL.
386 static struct gl_program
*
387 get_xfb_source(struct gl_context
*ctx
)
390 for (i
= MESA_SHADER_GEOMETRY
; i
>= MESA_SHADER_VERTEX
; i
--) {
391 if (ctx
->_Shader
->CurrentProgram
[i
] != NULL
)
392 return ctx
->_Shader
->CurrentProgram
[i
];
399 _mesa_BeginTransformFeedback(GLenum mode
)
401 struct gl_transform_feedback_object
*obj
;
402 struct gl_transform_feedback_info
*info
= NULL
;
404 unsigned vertices_per_prim
;
405 GET_CURRENT_CONTEXT(ctx
);
407 obj
= ctx
->TransformFeedback
.CurrentObject
;
409 /* Figure out what pipeline stage is the source of data for transform
412 struct gl_program
*source
= get_xfb_source(ctx
);
413 if (source
== NULL
) {
414 _mesa_error(ctx
, GL_INVALID_OPERATION
,
415 "glBeginTransformFeedback(no program active)");
419 info
= source
->sh
.LinkedTransformFeedback
;
421 if (info
->NumOutputs
== 0) {
422 _mesa_error(ctx
, GL_INVALID_OPERATION
,
423 "glBeginTransformFeedback(no varyings to record)");
429 vertices_per_prim
= 1;
432 vertices_per_prim
= 2;
435 vertices_per_prim
= 3;
438 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBeginTransformFeedback(mode)");
443 _mesa_error(ctx
, GL_INVALID_OPERATION
,
444 "glBeginTransformFeedback(already active)");
448 for (i
= 0; i
< ctx
->Const
.MaxTransformFeedbackBuffers
; i
++) {
449 if ((info
->ActiveBuffers
>> i
) & 1) {
450 if (obj
->BufferNames
[i
] == 0) {
451 _mesa_error(ctx
, GL_INVALID_OPERATION
,
452 "glBeginTransformFeedback(binding point %d does not "
453 "have a buffer object bound)", i
);
459 FLUSH_VERTICES(ctx
, 0);
460 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
462 obj
->Active
= GL_TRUE
;
463 ctx
->TransformFeedback
.Mode
= mode
;
465 compute_transform_feedback_buffer_sizes(obj
);
467 if (_mesa_is_gles3(ctx
)) {
468 /* In GLES3, we are required to track the usage of the transform
469 * feedback buffer and report INVALID_OPERATION if a draw call tries to
470 * exceed it. So compute the maximum number of vertices that we can
471 * write without overflowing any of the buffers currently being used for
474 unsigned max_vertices
475 = _mesa_compute_max_transform_feedback_vertices(ctx
, obj
, info
);
476 obj
->GlesRemainingPrims
= max_vertices
/ vertices_per_prim
;
479 if (obj
->program
!= source
) {
480 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedbackProg
;
481 obj
->program
= source
;
484 assert(ctx
->Driver
.BeginTransformFeedback
);
485 ctx
->Driver
.BeginTransformFeedback(ctx
, mode
, obj
);
490 _mesa_EndTransformFeedback(void)
492 struct gl_transform_feedback_object
*obj
;
493 GET_CURRENT_CONTEXT(ctx
);
495 obj
= ctx
->TransformFeedback
.CurrentObject
;
498 _mesa_error(ctx
, GL_INVALID_OPERATION
,
499 "glEndTransformFeedback(not active)");
503 FLUSH_VERTICES(ctx
, 0);
504 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
506 assert(ctx
->Driver
.EndTransformFeedback
);
507 ctx
->Driver
.EndTransformFeedback(ctx
, obj
);
509 ctx
->TransformFeedback
.CurrentObject
->Active
= GL_FALSE
;
510 ctx
->TransformFeedback
.CurrentObject
->Paused
= GL_FALSE
;
511 ctx
->TransformFeedback
.CurrentObject
->EndedAnytime
= GL_TRUE
;
516 * Helper used by BindBufferRange() and BindBufferBase().
519 bind_buffer_range(struct gl_context
*ctx
,
520 struct gl_transform_feedback_object
*obj
,
522 struct gl_buffer_object
*bufObj
,
523 GLintptr offset
, GLsizeiptr size
,
526 /* Note: no need to FLUSH_VERTICES or flag NewTransformFeedback, because
527 * transform feedback buffers can't be changed while transform feedback is
532 /* The general binding point */
533 _mesa_reference_buffer_object(ctx
,
534 &ctx
->TransformFeedback
.CurrentBuffer
,
538 /* The per-attribute binding point */
539 _mesa_set_transform_feedback_binding(ctx
, obj
, index
, bufObj
, offset
, size
);
544 * Validate the buffer object to receive transform feedback results. Plus,
545 * validate the starting offset to place the results, and max size.
546 * Called from the glBindBufferRange() and glTransformFeedbackBufferRange
550 _mesa_validate_buffer_range_xfb(struct gl_context
*ctx
,
551 struct gl_transform_feedback_object
*obj
,
552 GLuint index
, struct gl_buffer_object
*bufObj
,
553 GLintptr offset
, GLsizeiptr size
, bool dsa
)
555 const char *gl_methd_name
;
557 gl_methd_name
= "glTransformFeedbackBufferRange";
559 gl_methd_name
= "glBindBufferRange";
563 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(transform feedback active)",
568 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
569 /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
570 * generated if index is greater than or equal to the number of binding
571 * points for transform feedback, as described in section 6.7.1."
573 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(index=%d out of bounds)",
574 gl_methd_name
, index
);
579 /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
580 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(size=%d must be a multiple of "
581 "four)", gl_methd_name
, (int) size
);
586 /* OpenGL 4.5 core profile, 6.7, pdf page 103: multiple of 4 */
587 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(offset=%d must be a multiple "
588 "of four)", gl_methd_name
, (int) offset
);
593 /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
594 * generated by BindBufferRange if offset is negative."
596 * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
597 * is generated by TransformFeedbackBufferRange if offset is negative."
599 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(offset=%d must be >= 0)",
605 if (size
<= 0 && (dsa
|| bufObj
!= ctx
->Shared
->NullBufferObj
)) {
606 /* OpenGL 4.5 core profile, 6.1, pdf page 82: "An INVALID_VALUE error is
607 * generated by BindBufferRange if buffer is non-zero and size is less
608 * than or equal to zero."
610 * OpenGL 4.5 core profile, 13.2, pdf page 445: "An INVALID_VALUE error
611 * is generated by TransformFeedbackBufferRange if size is less than or
614 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(size=%d must be > 0)",
615 gl_methd_name
, (int) size
);
624 * Specify a buffer object to receive transform feedback results.
625 * As above, but start at offset = 0.
626 * Called from the glBindBufferBase() and glTransformFeedbackBufferBase()
630 _mesa_bind_buffer_base_transform_feedback(struct gl_context
*ctx
,
631 struct gl_transform_feedback_object
*obj
,
633 struct gl_buffer_object
*bufObj
,
637 _mesa_error(ctx
, GL_INVALID_OPERATION
,
638 "%s(transform feedback active)",
639 dsa
? "glTransformFeedbackBufferBase" : "glBindBufferBase");
643 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
644 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(index=%d out of bounds)",
645 dsa
? "glTransformFeedbackBufferBase" : "glBindBufferBase",
650 bind_buffer_range(ctx
, obj
, index
, bufObj
, 0, 0, dsa
);
654 * Wrapper around lookup_transform_feedback_object that throws
655 * GL_INVALID_OPERATION if id is not in the hash table. After calling
656 * _mesa_error, it returns NULL.
658 static struct gl_transform_feedback_object
*
659 lookup_transform_feedback_object_err(struct gl_context
*ctx
,
660 GLuint xfb
, const char* func
)
662 struct gl_transform_feedback_object
*obj
;
664 obj
= _mesa_lookup_transform_feedback_object(ctx
, xfb
);
666 _mesa_error(ctx
, GL_INVALID_OPERATION
,
667 "%s(xfb=%u: non-generated object name)", func
, xfb
);
674 * Wrapper around _mesa_lookup_bufferobj that throws GL_INVALID_VALUE if id
675 * is not in the hash table. Specialised version for the
676 * transform-feedback-related functions. After calling _mesa_error, it
679 static struct gl_buffer_object
*
680 lookup_transform_feedback_bufferobj_err(struct gl_context
*ctx
,
681 GLuint buffer
, const char* func
)
683 struct gl_buffer_object
*bufObj
;
685 /* OpenGL 4.5 core profile, 13.2, pdf page 444: buffer must be zero or the
686 * name of an existing buffer object.
689 bufObj
= ctx
->Shared
->NullBufferObj
;
691 bufObj
= _mesa_lookup_bufferobj(ctx
, buffer
);
693 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(invalid buffer=%u)", func
,
702 _mesa_TransformFeedbackBufferBase(GLuint xfb
, GLuint index
, GLuint buffer
)
704 GET_CURRENT_CONTEXT(ctx
);
705 struct gl_transform_feedback_object
*obj
;
706 struct gl_buffer_object
*bufObj
;
708 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
709 "glTransformFeedbackBufferBase");
714 bufObj
= lookup_transform_feedback_bufferobj_err(ctx
, buffer
,
715 "glTransformFeedbackBufferBase");
720 _mesa_bind_buffer_base_transform_feedback(ctx
, obj
, index
, bufObj
, true);
724 _mesa_TransformFeedbackBufferRange(GLuint xfb
, GLuint index
, GLuint buffer
,
725 GLintptr offset
, GLsizeiptr size
)
727 GET_CURRENT_CONTEXT(ctx
);
728 struct gl_transform_feedback_object
*obj
;
729 struct gl_buffer_object
*bufObj
;
731 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
732 "glTransformFeedbackBufferRange");
737 bufObj
= lookup_transform_feedback_bufferobj_err(ctx
, buffer
,
738 "glTransformFeedbackBufferRange");
743 if (!_mesa_validate_buffer_range_xfb(ctx
, obj
, index
, bufObj
, offset
,
747 /* The per-attribute binding point */
748 _mesa_set_transform_feedback_binding(ctx
, obj
, index
, bufObj
, offset
,
753 * Specify a buffer object to receive transform feedback results, plus the
754 * offset in the buffer to start placing results.
755 * This function is part of GL_EXT_transform_feedback, but not GL3.
758 _mesa_BindBufferOffsetEXT(GLenum target
, GLuint index
, GLuint buffer
,
761 struct gl_transform_feedback_object
*obj
;
762 struct gl_buffer_object
*bufObj
;
763 GET_CURRENT_CONTEXT(ctx
);
765 if (target
!= GL_TRANSFORM_FEEDBACK_BUFFER
) {
766 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBindBufferOffsetEXT(target)");
770 obj
= ctx
->TransformFeedback
.CurrentObject
;
773 _mesa_error(ctx
, GL_INVALID_OPERATION
,
774 "glBindBufferOffsetEXT(transform feedback active)");
778 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
779 _mesa_error(ctx
, GL_INVALID_VALUE
,
780 "glBindBufferOffsetEXT(index=%d)", index
);
785 /* must be multiple of four */
786 _mesa_error(ctx
, GL_INVALID_VALUE
,
787 "glBindBufferOffsetEXT(offset=%d)", (int) offset
);
792 bufObj
= ctx
->Shared
->NullBufferObj
;
794 bufObj
= _mesa_lookup_bufferobj(ctx
, buffer
);
798 _mesa_error(ctx
, GL_INVALID_OPERATION
,
799 "glBindBufferOffsetEXT(invalid buffer=%u)", buffer
);
803 _mesa_bind_buffer_range_xfb(ctx
, obj
, index
, bufObj
, offset
, 0);
808 * This function specifies the transform feedback outputs to be written
809 * to the feedback buffer(s), and in what order.
812 _mesa_TransformFeedbackVaryings(GLuint program
, GLsizei count
,
813 const GLchar
* const *varyings
,
816 struct gl_shader_program
*shProg
;
818 GET_CURRENT_CONTEXT(ctx
);
820 /* From the ARB_transform_feedback2 specification:
821 * "The error INVALID_OPERATION is generated by TransformFeedbackVaryings
822 * if the current transform feedback object is active, even if paused."
824 if (ctx
->TransformFeedback
.CurrentObject
->Active
) {
825 _mesa_error(ctx
, GL_INVALID_OPERATION
,
826 "glTransformFeedbackVaryings(current object is active)");
830 switch (bufferMode
) {
831 case GL_INTERLEAVED_ATTRIBS
:
833 case GL_SEPARATE_ATTRIBS
:
836 _mesa_error(ctx
, GL_INVALID_ENUM
,
837 "glTransformFeedbackVaryings(bufferMode)");
842 (bufferMode
== GL_SEPARATE_ATTRIBS
&&
843 (GLuint
) count
> ctx
->Const
.MaxTransformFeedbackBuffers
)) {
844 _mesa_error(ctx
, GL_INVALID_VALUE
,
845 "glTransformFeedbackVaryings(count=%d)", count
);
849 shProg
= _mesa_lookup_shader_program_err(ctx
, program
,
850 "glTransformFeedbackVaryings");
854 if (ctx
->Extensions
.ARB_transform_feedback3
) {
855 if (bufferMode
== GL_INTERLEAVED_ATTRIBS
) {
856 unsigned buffers
= 1;
858 for (i
= 0; i
< count
; i
++) {
859 if (strcmp(varyings
[i
], "gl_NextBuffer") == 0)
863 if (buffers
> ctx
->Const
.MaxTransformFeedbackBuffers
) {
864 _mesa_error(ctx
, GL_INVALID_OPERATION
,
865 "glTransformFeedbackVaryings(too many gl_NextBuffer "
870 for (i
= 0; i
< count
; i
++) {
871 if (strcmp(varyings
[i
], "gl_NextBuffer") == 0 ||
872 strcmp(varyings
[i
], "gl_SkipComponents1") == 0 ||
873 strcmp(varyings
[i
], "gl_SkipComponents2") == 0 ||
874 strcmp(varyings
[i
], "gl_SkipComponents3") == 0 ||
875 strcmp(varyings
[i
], "gl_SkipComponents4") == 0) {
876 _mesa_error(ctx
, GL_INVALID_OPERATION
,
877 "glTransformFeedbackVaryings(SEPARATE_ATTRIBS,"
886 /* free existing varyings, if any */
887 for (i
= 0; i
< (GLint
) shProg
->TransformFeedback
.NumVarying
; i
++) {
888 free(shProg
->TransformFeedback
.VaryingNames
[i
]);
890 free(shProg
->TransformFeedback
.VaryingNames
);
892 /* allocate new memory for varying names */
893 shProg
->TransformFeedback
.VaryingNames
=
894 malloc(count
* sizeof(GLchar
*));
896 if (!shProg
->TransformFeedback
.VaryingNames
) {
897 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glTransformFeedbackVaryings()");
901 /* Save the new names and the count */
902 for (i
= 0; i
< count
; i
++) {
903 shProg
->TransformFeedback
.VaryingNames
[i
] = strdup(varyings
[i
]);
905 shProg
->TransformFeedback
.NumVarying
= count
;
907 shProg
->TransformFeedback
.BufferMode
= bufferMode
;
909 /* No need to invoke FLUSH_VERTICES or flag NewTransformFeedback since
910 * the varyings won't be used until shader link time.
916 * Get info about the transform feedback outputs which are to be written
917 * to the feedback buffer(s).
920 _mesa_GetTransformFeedbackVarying(GLuint program
, GLuint index
,
921 GLsizei bufSize
, GLsizei
*length
,
922 GLsizei
*size
, GLenum
*type
, GLchar
*name
)
924 const struct gl_shader_program
*shProg
;
925 struct gl_program_resource
*res
;
926 GET_CURRENT_CONTEXT(ctx
);
928 shProg
= _mesa_lookup_shader_program_err(ctx
, program
,
929 "glGetTransformFeedbackVarying");
933 res
= _mesa_program_resource_find_index((struct gl_shader_program
*) shProg
,
934 GL_TRANSFORM_FEEDBACK_VARYING
,
937 _mesa_error(ctx
, GL_INVALID_VALUE
,
938 "glGetTransformFeedbackVarying(index=%u)", index
);
942 /* return the varying's name and length */
943 _mesa_copy_string(name
, bufSize
, length
, _mesa_program_resource_name(res
));
945 /* return the datatype and value's size (in datatype units) */
947 _mesa_program_resource_prop((struct gl_shader_program
*) shProg
,
948 res
, index
, GL_TYPE
, (GLint
*) type
,
949 "glGetTransformFeedbackVarying");
951 _mesa_program_resource_prop((struct gl_shader_program
*) shProg
,
952 res
, index
, GL_ARRAY_SIZE
, (GLint
*) size
,
953 "glGetTransformFeedbackVarying");
958 struct gl_transform_feedback_object
*
959 _mesa_lookup_transform_feedback_object(struct gl_context
*ctx
, GLuint name
)
961 /* OpenGL 4.5 core profile, 13.2 pdf page 444: "xfb must be zero, indicating
962 * the default transform feedback object, or the name of an existing
963 * transform feedback object."
966 return ctx
->TransformFeedback
.DefaultObject
;
969 return (struct gl_transform_feedback_object
*)
970 _mesa_HashLookupLocked(ctx
->TransformFeedback
.Objects
, name
);
974 create_transform_feedbacks(struct gl_context
*ctx
, GLsizei n
, GLuint
*ids
,
981 func
= "glCreateTransformFeedbacks";
983 func
= "glGenTransformFeedbacks";
986 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(n < 0)", func
);
993 /* we don't need contiguous IDs, but this might be faster */
994 first
= _mesa_HashFindFreeKeyBlock(ctx
->TransformFeedback
.Objects
, n
);
997 for (i
= 0; i
< n
; i
++) {
998 struct gl_transform_feedback_object
*obj
999 = ctx
->Driver
.NewTransformFeedback(ctx
, first
+ i
);
1001 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "%s", func
);
1005 _mesa_HashInsertLocked(ctx
->TransformFeedback
.Objects
, first
+ i
,
1008 /* this is normally done at bind time in the non-dsa case */
1009 obj
->EverBound
= GL_TRUE
;
1014 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "%s", func
);
1019 * Create new transform feedback objects. Transform feedback objects
1020 * encapsulate the state related to transform feedback to allow quickly
1021 * switching state (and drawing the results, below).
1022 * Part of GL_ARB_transform_feedback2.
1025 _mesa_GenTransformFeedbacks(GLsizei n
, GLuint
*names
)
1027 GET_CURRENT_CONTEXT(ctx
);
1029 /* GenTransformFeedbacks should just reserve the object names that a
1030 * subsequent call to BindTransformFeedback should actively create. For
1031 * the sake of simplicity, we reserve the names and create the objects
1035 create_transform_feedbacks(ctx
, n
, names
, false);
1039 * Create new transform feedback objects. Transform feedback objects
1040 * encapsulate the state related to transform feedback to allow quickly
1041 * switching state (and drawing the results, below).
1042 * Part of GL_ARB_direct_state_access.
1045 _mesa_CreateTransformFeedbacks(GLsizei n
, GLuint
*names
)
1047 GET_CURRENT_CONTEXT(ctx
);
1049 create_transform_feedbacks(ctx
, n
, names
, true);
1054 * Is the given ID a transform feedback object?
1055 * Part of GL_ARB_transform_feedback2.
1057 GLboolean GLAPIENTRY
1058 _mesa_IsTransformFeedback(GLuint name
)
1060 struct gl_transform_feedback_object
*obj
;
1061 GET_CURRENT_CONTEXT(ctx
);
1063 ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx
, GL_FALSE
);
1068 obj
= _mesa_lookup_transform_feedback_object(ctx
, name
);
1072 return obj
->EverBound
;
1077 * Bind the given transform feedback object.
1078 * Part of GL_ARB_transform_feedback2.
1081 _mesa_BindTransformFeedback(GLenum target
, GLuint name
)
1083 struct gl_transform_feedback_object
*obj
;
1084 GET_CURRENT_CONTEXT(ctx
);
1086 if (target
!= GL_TRANSFORM_FEEDBACK
) {
1087 _mesa_error(ctx
, GL_INVALID_ENUM
, "glBindTransformFeedback(target)");
1091 if (_mesa_is_xfb_active_and_unpaused(ctx
)) {
1092 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1093 "glBindTransformFeedback(transform is active, or not paused)");
1097 obj
= _mesa_lookup_transform_feedback_object(ctx
, name
);
1099 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1100 "glBindTransformFeedback(name=%u)", name
);
1104 reference_transform_feedback_object(&ctx
->TransformFeedback
.CurrentObject
,
1110 * Delete the given transform feedback objects.
1111 * Part of GL_ARB_transform_feedback2.
1114 _mesa_DeleteTransformFeedbacks(GLsizei n
, const GLuint
*names
)
1117 GET_CURRENT_CONTEXT(ctx
);
1120 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDeleteTransformFeedbacks(n < 0)");
1127 for (i
= 0; i
< n
; i
++) {
1129 struct gl_transform_feedback_object
*obj
1130 = _mesa_lookup_transform_feedback_object(ctx
, names
[i
]);
1133 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1134 "glDeleteTransformFeedbacks(object %u is active)",
1138 _mesa_HashRemoveLocked(ctx
->TransformFeedback
.Objects
, names
[i
]);
1139 /* unref, but object may not be deleted until later */
1140 if (obj
== ctx
->TransformFeedback
.CurrentObject
) {
1141 reference_transform_feedback_object(
1142 &ctx
->TransformFeedback
.CurrentObject
,
1143 ctx
->TransformFeedback
.DefaultObject
);
1145 reference_transform_feedback_object(&obj
, NULL
);
1153 * Pause transform feedback.
1154 * Part of GL_ARB_transform_feedback2.
1157 _mesa_PauseTransformFeedback(void)
1159 struct gl_transform_feedback_object
*obj
;
1160 GET_CURRENT_CONTEXT(ctx
);
1162 obj
= ctx
->TransformFeedback
.CurrentObject
;
1164 if (!_mesa_is_xfb_active_and_unpaused(ctx
)) {
1165 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1166 "glPauseTransformFeedback(feedback not active or already paused)");
1170 FLUSH_VERTICES(ctx
, 0);
1171 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
1173 assert(ctx
->Driver
.PauseTransformFeedback
);
1174 ctx
->Driver
.PauseTransformFeedback(ctx
, obj
);
1176 obj
->Paused
= GL_TRUE
;
1181 * Resume transform feedback.
1182 * Part of GL_ARB_transform_feedback2.
1185 _mesa_ResumeTransformFeedback(void)
1187 struct gl_transform_feedback_object
*obj
;
1188 GET_CURRENT_CONTEXT(ctx
);
1190 obj
= ctx
->TransformFeedback
.CurrentObject
;
1192 if (!obj
->Active
|| !obj
->Paused
) {
1193 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1194 "glResumeTransformFeedback(feedback not active or not paused)");
1198 /* From the ARB_transform_feedback2 specification:
1199 * "The error INVALID_OPERATION is generated by ResumeTransformFeedback if
1200 * the program object being used by the current transform feedback object
1203 if (obj
->program
!= get_xfb_source(ctx
)) {
1204 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1205 "glResumeTransformFeedback(wrong program bound)");
1209 FLUSH_VERTICES(ctx
, 0);
1210 ctx
->NewDriverState
|= ctx
->DriverFlags
.NewTransformFeedback
;
1212 obj
->Paused
= GL_FALSE
;
1214 assert(ctx
->Driver
.ResumeTransformFeedback
);
1215 ctx
->Driver
.ResumeTransformFeedback(ctx
, obj
);
1218 extern void GLAPIENTRY
1219 _mesa_GetTransformFeedbackiv(GLuint xfb
, GLenum pname
, GLint
*param
)
1221 struct gl_transform_feedback_object
*obj
;
1222 GET_CURRENT_CONTEXT(ctx
);
1224 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
1225 "glGetTransformFeedbackiv");
1231 case GL_TRANSFORM_FEEDBACK_PAUSED
:
1232 *param
= obj
->Paused
;
1234 case GL_TRANSFORM_FEEDBACK_ACTIVE
:
1235 *param
= obj
->Active
;
1238 _mesa_error(ctx
, GL_INVALID_ENUM
,
1239 "glGetTransformFeedbackiv(pname=%i)", pname
);
1243 extern void GLAPIENTRY
1244 _mesa_GetTransformFeedbacki_v(GLuint xfb
, GLenum pname
, GLuint index
,
1247 struct gl_transform_feedback_object
*obj
;
1248 GET_CURRENT_CONTEXT(ctx
);
1250 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
1251 "glGetTransformFeedbacki_v");
1256 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
1257 _mesa_error(ctx
, GL_INVALID_VALUE
,
1258 "glGetTransformFeedbacki_v(index=%i)", index
);
1263 case GL_TRANSFORM_FEEDBACK_BUFFER_BINDING
:
1264 *param
= obj
->BufferNames
[index
];
1267 _mesa_error(ctx
, GL_INVALID_ENUM
,
1268 "glGetTransformFeedbacki_v(pname=%i)", pname
);
1272 extern void GLAPIENTRY
1273 _mesa_GetTransformFeedbacki64_v(GLuint xfb
, GLenum pname
, GLuint index
,
1276 struct gl_transform_feedback_object
*obj
;
1277 GET_CURRENT_CONTEXT(ctx
);
1279 obj
= lookup_transform_feedback_object_err(ctx
, xfb
,
1280 "glGetTransformFeedbacki64_v");
1285 if (index
>= ctx
->Const
.MaxTransformFeedbackBuffers
) {
1286 _mesa_error(ctx
, GL_INVALID_VALUE
,
1287 "glGetTransformFeedbacki64_v(index=%i)", index
);
1291 compute_transform_feedback_buffer_sizes(obj
);
1293 case GL_TRANSFORM_FEEDBACK_BUFFER_START
:
1294 *param
= obj
->Offset
[index
];
1296 case GL_TRANSFORM_FEEDBACK_BUFFER_SIZE
:
1297 *param
= obj
->Size
[index
];
1300 _mesa_error(ctx
, GL_INVALID_ENUM
,
1301 "glGetTransformFeedbacki64_v(pname=%i)", pname
);