2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2007 Brian Paul 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.
28 * glReadBuffer, DrawBuffer functions.
40 #include "util/bitscan.h"
41 #include "util/u_math.h"
48 * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
49 * available to the rendering context (for drawing or reading).
50 * This depends on the type of framebuffer. For window system framebuffers
51 * we look at the framebuffer's visual. But for user-create framebuffers we
52 * look at the number of supported color attachments.
53 * \param fb the framebuffer to draw to, or read from
54 * \return bitmask of BUFFER_BIT_* flags
57 supported_buffer_bitmask(const struct gl_context
*ctx
,
58 const struct gl_framebuffer
*fb
)
60 GLbitfield mask
= 0x0;
62 if (_mesa_is_user_fbo(fb
)) {
63 /* A user-created renderbuffer */
64 mask
= ((1 << ctx
->Const
.MaxColorAttachments
) - 1) << BUFFER_COLOR0
;
67 /* A window system framebuffer */
69 mask
= BUFFER_BIT_FRONT_LEFT
; /* always have this */
70 if (fb
->Visual
.stereoMode
) {
71 mask
|= BUFFER_BIT_FRONT_RIGHT
;
72 if (fb
->Visual
.doubleBufferMode
) {
73 mask
|= BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
76 else if (fb
->Visual
.doubleBufferMode
) {
77 mask
|= BUFFER_BIT_BACK_LEFT
;
80 for (i
= 0; i
< fb
->Visual
.numAuxBuffers
; i
++) {
81 mask
|= (BUFFER_BIT_AUX0
<< i
);
89 _mesa_back_to_front_if_single_buffered(const struct gl_framebuffer
*fb
,
92 /* If the front buffer is the only buffer, GL_BACK and all other flags
93 * that include BACK select the front buffer for drawing. There are
94 * several reasons we want to do this.
96 * 1) OpenGL ES 3.0 requires it:
98 * Page 181 (page 192 of the PDF) in section 4.2.1 of the OpenGL
99 * ES 3.0.1 specification says:
101 * "When draw buffer zero is BACK, color values are written
102 * into the sole buffer for single-buffered contexts, or into
103 * the back buffer for double-buffered contexts."
105 * We also do this for GLES 1 and 2 because those APIs have no
106 * concept of selecting the front and back buffer anyway and it's
107 * convenient to be able to maintain the magic behaviour of
108 * GL_BACK in that case.
110 * 2) Pbuffers are back buffers from the application point of view,
111 * but they are front buffers from the Mesa point of view,
112 * because they are always single buffered.
114 if (!fb
->Visual
.doubleBufferMode
) {
120 buffer
= GL_FRONT_RIGHT
;
123 buffer
= GL_FRONT_LEFT
;
132 * Helper routine used by glDrawBuffer and glDrawBuffersARB.
133 * Given a GLenum naming one or more color buffers (such as
134 * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
137 draw_buffer_enum_to_bitmask(const struct gl_context
*ctx
, GLenum buffer
)
139 buffer
= _mesa_back_to_front_if_single_buffered(ctx
->DrawBuffer
, buffer
);
145 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_FRONT_RIGHT
;
147 return BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
149 return BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
151 return BUFFER_BIT_FRONT_RIGHT
;
153 return BUFFER_BIT_BACK_RIGHT
;
155 return BUFFER_BIT_BACK_LEFT
;
156 case GL_FRONT_AND_BACK
:
157 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
158 | BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
160 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
;
162 return BUFFER_BIT_FRONT_LEFT
;
164 return BUFFER_BIT_AUX0
;
168 return 1 << BUFFER_COUNT
; /* invalid, but not BAD_MASK */
169 case GL_COLOR_ATTACHMENT0_EXT
:
170 return BUFFER_BIT_COLOR0
;
171 case GL_COLOR_ATTACHMENT1_EXT
:
172 return BUFFER_BIT_COLOR1
;
173 case GL_COLOR_ATTACHMENT2_EXT
:
174 return BUFFER_BIT_COLOR2
;
175 case GL_COLOR_ATTACHMENT3_EXT
:
176 return BUFFER_BIT_COLOR3
;
177 case GL_COLOR_ATTACHMENT4_EXT
:
178 return BUFFER_BIT_COLOR4
;
179 case GL_COLOR_ATTACHMENT5_EXT
:
180 return BUFFER_BIT_COLOR5
;
181 case GL_COLOR_ATTACHMENT6_EXT
:
182 return BUFFER_BIT_COLOR6
;
183 case GL_COLOR_ATTACHMENT7_EXT
:
184 return BUFFER_BIT_COLOR7
;
186 /* not an error, but also not supported */
187 if (buffer
>= GL_COLOR_ATTACHMENT8
&& buffer
<= GL_COLOR_ATTACHMENT31
)
188 return 1 << BUFFER_COUNT
;
196 * Helper routine used by glReadBuffer.
197 * Given a GLenum naming a color buffer, return the index of the corresponding
198 * renderbuffer (a BUFFER_* value).
199 * return BUFFER_NONE for an invalid buffer.
201 static gl_buffer_index
202 read_buffer_enum_to_index(const struct gl_context
*ctx
, GLenum buffer
)
204 buffer
= _mesa_back_to_front_if_single_buffered(ctx
->ReadBuffer
, buffer
);
208 return BUFFER_FRONT_LEFT
;
210 return BUFFER_BACK_LEFT
;
212 return BUFFER_FRONT_RIGHT
;
214 return BUFFER_FRONT_RIGHT
;
216 return BUFFER_BACK_RIGHT
;
218 return BUFFER_BACK_LEFT
;
220 return BUFFER_FRONT_LEFT
;
222 return BUFFER_FRONT_LEFT
;
225 case GL_FRONT_AND_BACK
:
226 return BUFFER_FRONT_LEFT
;
230 return BUFFER_COUNT
; /* invalid, but not -1 */
231 case GL_COLOR_ATTACHMENT0_EXT
:
232 return BUFFER_COLOR0
;
233 case GL_COLOR_ATTACHMENT1_EXT
:
234 return BUFFER_COLOR1
;
235 case GL_COLOR_ATTACHMENT2_EXT
:
236 return BUFFER_COLOR2
;
237 case GL_COLOR_ATTACHMENT3_EXT
:
238 return BUFFER_COLOR3
;
239 case GL_COLOR_ATTACHMENT4_EXT
:
240 return BUFFER_COLOR4
;
241 case GL_COLOR_ATTACHMENT5_EXT
:
242 return BUFFER_COLOR5
;
243 case GL_COLOR_ATTACHMENT6_EXT
:
244 return BUFFER_COLOR6
;
245 case GL_COLOR_ATTACHMENT7_EXT
:
246 return BUFFER_COLOR7
;
248 /* not an error, but also not supported */
249 if (buffer
>= GL_COLOR_ATTACHMENT8
&& buffer
<= GL_COLOR_ATTACHMENT31
)
257 is_legal_es3_readbuffer_enum(GLenum buf
)
259 return buf
== GL_BACK
|| buf
== GL_NONE
||
260 (buf
>= GL_COLOR_ATTACHMENT0
&& buf
<= GL_COLOR_ATTACHMENT31
);
264 * Called by glDrawBuffer() and glNamedFramebufferDrawBuffer().
265 * Specify which renderbuffer(s) to draw into for the first color output.
266 * <buffer> can name zero, one, two or four renderbuffers!
267 * \sa _mesa_DrawBuffers
269 * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
271 * Note that the behaviour of this function depends on whether the
272 * current ctx->DrawBuffer is a window-system framebuffer or a user-created
273 * framebuffer object.
274 * In the former case, we update the per-context ctx->Color.DrawBuffer
275 * state var _and_ the FB's ColorDrawBuffer state.
276 * In the later case, we update the FB's ColorDrawBuffer state only.
278 * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the
279 * new FB is a window system FB, we need to re-update the FB's
280 * ColorDrawBuffer state to match the context. This is handled in
281 * _mesa_update_framebuffer().
283 * See the GL_EXT_framebuffer_object spec for more info.
285 static ALWAYS_INLINE
void
286 draw_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
287 GLenum buffer
, const char *caller
, bool no_error
)
291 FLUSH_VERTICES(ctx
, 0);
293 if (MESA_VERBOSE
& VERBOSE_API
) {
294 _mesa_debug(ctx
, "%s %s\n", caller
, _mesa_enum_to_string(buffer
));
297 if (buffer
== GL_NONE
) {
301 const GLbitfield supportedMask
302 = supported_buffer_bitmask(ctx
, fb
);
303 destMask
= draw_buffer_enum_to_bitmask(ctx
, buffer
);
304 if (!no_error
&& destMask
== BAD_MASK
) {
305 /* totally bogus buffer */
306 _mesa_error(ctx
, GL_INVALID_ENUM
, "%s(invalid buffer %s)", caller
,
307 _mesa_enum_to_string(buffer
));
310 destMask
&= supportedMask
;
311 if (!no_error
&& destMask
== 0x0) {
312 /* none of the named color buffers exist! */
313 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(invalid buffer %s)",
314 caller
, _mesa_enum_to_string(buffer
));
319 /* if we get here, there's no error so set new state */
320 const GLenum16 buffer16
= buffer
;
321 _mesa_drawbuffers(ctx
, fb
, 1, &buffer16
, &destMask
);
323 /* Call device driver function only if fb is the bound draw buffer */
324 if (fb
== ctx
->DrawBuffer
) {
325 if (ctx
->Driver
.DrawBuffer
)
326 ctx
->Driver
.DrawBuffer(ctx
);
327 if (ctx
->Driver
.DrawBufferAllocate
)
328 ctx
->Driver
.DrawBufferAllocate(ctx
);
334 draw_buffer_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
335 GLenum buffer
, const char *caller
)
337 draw_buffer(ctx
, fb
, buffer
, caller
, false);
342 draw_buffer_no_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
343 GLenum buffer
, const char *caller
)
345 draw_buffer(ctx
, fb
, buffer
, caller
, true);
350 _mesa_DrawBuffer_no_error(GLenum buffer
)
352 GET_CURRENT_CONTEXT(ctx
);
353 draw_buffer_no_error(ctx
, ctx
->DrawBuffer
, buffer
, "glDrawBuffer");
358 _mesa_DrawBuffer(GLenum buffer
)
360 GET_CURRENT_CONTEXT(ctx
);
361 draw_buffer_error(ctx
, ctx
->DrawBuffer
, buffer
, "glDrawBuffer");
366 _mesa_NamedFramebufferDrawBuffer_no_error(GLuint framebuffer
, GLenum buf
)
368 GET_CURRENT_CONTEXT(ctx
);
369 struct gl_framebuffer
*fb
;
372 fb
= _mesa_lookup_framebuffer(ctx
, framebuffer
);
374 fb
= ctx
->WinSysDrawBuffer
;
377 draw_buffer_no_error(ctx
, fb
, buf
, "glNamedFramebufferDrawBuffer");
382 _mesa_FramebufferDrawBufferEXT(GLuint framebuffer
, GLenum buf
)
384 GET_CURRENT_CONTEXT(ctx
);
385 struct gl_framebuffer
*fb
;
388 fb
= _mesa_lookup_framebuffer_dsa(ctx
, framebuffer
,
389 "glFramebufferDrawBufferEXT");
394 fb
= ctx
->WinSysDrawBuffer
;
396 draw_buffer_error(ctx
, fb
, buf
, "glFramebufferDrawBufferEXT");
401 _mesa_NamedFramebufferDrawBuffer(GLuint framebuffer
, GLenum buf
)
403 GET_CURRENT_CONTEXT(ctx
);
404 struct gl_framebuffer
*fb
;
407 fb
= _mesa_lookup_framebuffer_err(ctx
, framebuffer
,
408 "glNamedFramebufferDrawBuffer");
413 fb
= ctx
->WinSysDrawBuffer
;
415 draw_buffer_error(ctx
, fb
, buf
, "glNamedFramebufferDrawBuffer");
420 * Called by glDrawBuffersARB() and glNamedFramebufferDrawBuffers() to specify
421 * the destination color renderbuffers for N fragment program color outputs.
422 * \sa _mesa_DrawBuffer
423 * \param n number of outputs
424 * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
425 * names cannot specify more than one buffer. For example,
426 * GL_FRONT_AND_BACK is illegal. The only exception is GL_BACK
427 * that is considered special and allowed as far as n is one
430 static ALWAYS_INLINE
void
431 draw_buffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
, GLsizei n
,
432 const GLenum
*buffers
, const char *caller
, bool no_error
)
435 GLbitfield usedBufferMask
, supportedMask
;
436 GLbitfield destMask
[MAX_DRAW_BUFFERS
];
438 FLUSH_VERTICES(ctx
, 0);
441 /* Turns out n==0 is a valid input that should not produce an error.
442 * The remaining code below correctly handles the n==0 case.
444 * From the OpenGL 3.0 specification, page 258:
445 * "An INVALID_VALUE error is generated if n is greater than
449 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(n < 0)", caller
);
453 if (n
> (GLsizei
) ctx
->Const
.MaxDrawBuffers
) {
454 _mesa_error(ctx
, GL_INVALID_VALUE
,
455 "%s(n > maximum number of draw buffers)", caller
);
459 /* From the ES 3.0 specification, page 180:
460 * "If the GL is bound to the default framebuffer, then n must be 1
461 * and the constant must be BACK or NONE."
462 * (same restriction applies with GL_EXT_draw_buffers specification)
464 if (ctx
->API
== API_OPENGLES2
&& _mesa_is_winsys_fbo(fb
) &&
465 (n
!= 1 || (buffers
[0] != GL_NONE
&& buffers
[0] != GL_BACK
))) {
466 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(invalid buffers)", caller
);
471 supportedMask
= supported_buffer_bitmask(ctx
, fb
);
472 usedBufferMask
= 0x0;
474 /* complicated error checking... */
475 for (output
= 0; output
< n
; output
++) {
477 /* From the OpenGL 4.5 specification, page 493 (page 515 of the PDF)
478 * "An INVALID_ENUM error is generated if any value in bufs is FRONT,
479 * LEFT, RIGHT, or FRONT_AND_BACK . This restriction applies to both
480 * the default framebuffer and framebuffer objects, and exists because
481 * these constants may themselves refer to multiple buffers, as shown
484 * From the OpenGL 4.5 specification, page 492 (page 514 of the PDF):
485 * "If the default framebuffer is affected, then each of the constants
486 * must be one of the values listed in table 17.6 or the special value
487 * BACK. When BACK is used, n must be 1 and color values are written
488 * into the left buffer for single-buffered contexts, or into the back
489 * left buffer for double-buffered contexts."
491 * Note "special value BACK". GL_BACK also refers to multiple buffers,
492 * but it is consider a special case here. This is a change on 4.5.
493 * For OpenGL 4.x we check that behaviour. For any previous version we
494 * keep considering it wrong (as INVALID_ENUM).
496 if (buffers
[output
] == GL_BACK
&&
497 _mesa_is_winsys_fbo(fb
) &&
498 _mesa_is_desktop_gl(ctx
) &&
499 ctx
->Version
>= 40) {
501 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(with GL_BACK n must be 1)",
505 } else if (buffers
[output
] == GL_FRONT
||
506 buffers
[output
] == GL_LEFT
||
507 buffers
[output
] == GL_RIGHT
||
508 buffers
[output
] == GL_FRONT_AND_BACK
||
509 (buffers
[output
] == GL_BACK
&&
510 _mesa_is_desktop_gl(ctx
))) {
511 _mesa_error(ctx
, GL_INVALID_ENUM
, "%s(invalid buffer %s)",
512 caller
, _mesa_enum_to_string(buffers
[output
]));
517 destMask
[output
] = draw_buffer_enum_to_bitmask(ctx
, buffers
[output
]);
520 /* From the OpenGL 3.0 specification, page 258:
521 * "Each buffer listed in bufs must be one of the values from tables
522 * 4.5 or 4.6. Otherwise, an INVALID_ENUM error is generated.
524 if (destMask
[output
] == BAD_MASK
) {
525 _mesa_error(ctx
, GL_INVALID_ENUM
, "%s(invalid buffer %s)",
526 caller
, _mesa_enum_to_string(buffers
[output
]));
530 /* Section 4.2 (Whole Framebuffer Operations) of the OpenGL ES 3.0
531 * specification says:
533 * "If the GL is bound to a draw framebuffer object, the ith
534 * buffer listed in bufs must be COLOR_ATTACHMENTi or NONE .
535 * Specifying a buffer out of order, BACK , or COLOR_ATTACHMENTm
536 * where m is greater than or equal to the value of MAX_-
537 * COLOR_ATTACHMENTS , will generate the error INVALID_OPERATION .
539 if (_mesa_is_gles3(ctx
) && _mesa_is_user_fbo(fb
) &&
540 buffers
[output
] != GL_NONE
&&
541 (buffers
[output
] < GL_COLOR_ATTACHMENT0
||
542 buffers
[output
] >= GL_COLOR_ATTACHMENT0
+ ctx
->Const
.MaxColorAttachments
)) {
543 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffers(buffer)");
548 if (buffers
[output
] == GL_NONE
) {
549 destMask
[output
] = 0x0;
552 /* Page 259 (page 275 of the PDF) in section 4.2.1 of the OpenGL 3.0
553 * spec (20080923) says:
555 * "If the GL is bound to a framebuffer object and DrawBuffers is
556 * supplied with [...] COLOR_ATTACHMENTm where m is greater than
557 * or equal to the value of MAX_COLOR_ATTACHMENTS, then the error
558 * INVALID_OPERATION results."
560 if (!no_error
&& _mesa_is_user_fbo(fb
) && buffers
[output
] >=
561 GL_COLOR_ATTACHMENT0
+ ctx
->Const
.MaxDrawBuffers
) {
562 _mesa_error(ctx
, GL_INVALID_OPERATION
,
563 "%s(buffers[%d] >= maximum number of draw buffers)",
568 /* From the OpenGL 3.0 specification, page 259:
569 * "If the GL is bound to the default framebuffer and DrawBuffers is
570 * supplied with a constant (other than NONE) that does not indicate
571 * any of the color buffers allocated to the GL context by the window
572 * system, the error INVALID_OPERATION will be generated.
574 * If the GL is bound to a framebuffer object and DrawBuffers is
575 * supplied with a constant from table 4.6 [...] then the error
576 * INVALID_OPERATION results."
578 destMask
[output
] &= supportedMask
;
580 if (destMask
[output
] == 0) {
581 _mesa_error(ctx
, GL_INVALID_OPERATION
,
582 "%s(unsupported buffer %s)",
583 caller
, _mesa_enum_to_string(buffers
[output
]));
587 /* ES 3.0 is even more restrictive. From the ES 3.0 spec, page 180:
588 * "If the GL is bound to a framebuffer object, the ith buffer
589 * listed in bufs must be COLOR_ATTACHMENTi or NONE. [...]
590 * INVALID_OPERATION." (same restriction applies with
591 * GL_EXT_draw_buffers specification)
593 if (ctx
->API
== API_OPENGLES2
&& _mesa_is_user_fbo(fb
) &&
594 buffers
[output
] != GL_NONE
&&
595 buffers
[output
] != GL_COLOR_ATTACHMENT0
+ output
) {
596 _mesa_error(ctx
, GL_INVALID_OPERATION
,
597 "%s(unsupported buffer %s)",
598 caller
, _mesa_enum_to_string(buffers
[output
]));
602 /* From the OpenGL 3.0 specification, page 258:
603 * "Except for NONE, a buffer may not appear more than once in the
604 * array pointed to by bufs. Specifying a buffer more then once
605 * will result in the error INVALID_OPERATION."
607 if (destMask
[output
] & usedBufferMask
) {
608 _mesa_error(ctx
, GL_INVALID_OPERATION
,
609 "%s(duplicated buffer %s)",
610 caller
, _mesa_enum_to_string(buffers
[output
]));
616 usedBufferMask
|= destMask
[output
];
620 /* OK, if we get here, there were no errors so set the new state */
621 GLenum16 buffers16
[MAX_DRAW_BUFFERS
];
622 for (int i
= 0; i
< n
; i
++)
623 buffers16
[i
] = buffers
[i
];
625 _mesa_drawbuffers(ctx
, fb
, n
, buffers16
, destMask
);
628 * Call device driver function if fb is the bound draw buffer.
629 * Note that n can be equal to 0,
630 * in which case we don't want to reference buffers[0], which
633 if (fb
== ctx
->DrawBuffer
) {
634 if (ctx
->Driver
.DrawBuffer
)
635 ctx
->Driver
.DrawBuffer(ctx
);
636 if (ctx
->Driver
.DrawBufferAllocate
)
637 ctx
->Driver
.DrawBufferAllocate(ctx
);
643 draw_buffers_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
, GLsizei n
,
644 const GLenum
*buffers
, const char *caller
)
646 draw_buffers(ctx
, fb
, n
, buffers
, caller
, false);
651 draw_buffers_no_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
652 GLsizei n
, const GLenum
*buffers
, const char *caller
)
654 draw_buffers(ctx
, fb
, n
, buffers
, caller
, true);
659 _mesa_DrawBuffers_no_error(GLsizei n
, const GLenum
*buffers
)
661 GET_CURRENT_CONTEXT(ctx
);
662 draw_buffers_no_error(ctx
, ctx
->DrawBuffer
, n
, buffers
, "glDrawBuffers");
667 _mesa_DrawBuffers(GLsizei n
, const GLenum
*buffers
)
669 GET_CURRENT_CONTEXT(ctx
);
670 draw_buffers_error(ctx
, ctx
->DrawBuffer
, n
, buffers
, "glDrawBuffers");
674 _mesa_FramebufferDrawBuffersEXT(GLuint framebuffer
, GLsizei n
,
677 GET_CURRENT_CONTEXT(ctx
);
678 struct gl_framebuffer
*fb
;
681 fb
= _mesa_lookup_framebuffer_dsa(ctx
, framebuffer
,
682 "glFramebufferDrawBuffersEXT");
687 fb
= ctx
->WinSysDrawBuffer
;
689 draw_buffers_error(ctx
, fb
, n
, bufs
, "glFramebufferDrawBuffersEXT");
693 _mesa_NamedFramebufferDrawBuffers_no_error(GLuint framebuffer
, GLsizei n
,
696 GET_CURRENT_CONTEXT(ctx
);
697 struct gl_framebuffer
*fb
;
700 fb
= _mesa_lookup_framebuffer(ctx
, framebuffer
);
702 fb
= ctx
->WinSysDrawBuffer
;
705 draw_buffers_no_error(ctx
, fb
, n
, bufs
, "glNamedFramebufferDrawBuffers");
710 _mesa_NamedFramebufferDrawBuffers(GLuint framebuffer
, GLsizei n
,
713 GET_CURRENT_CONTEXT(ctx
);
714 struct gl_framebuffer
*fb
;
717 fb
= _mesa_lookup_framebuffer_err(ctx
, framebuffer
,
718 "glNamedFramebufferDrawBuffers");
723 fb
= ctx
->WinSysDrawBuffer
;
725 draw_buffers_error(ctx
, fb
, n
, bufs
, "glNamedFramebufferDrawBuffers");
730 * Performs necessary state updates when _mesa_drawbuffers makes an
734 updated_drawbuffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
736 FLUSH_VERTICES(ctx
, _NEW_BUFFERS
);
738 if (ctx
->API
== API_OPENGL_COMPAT
&& !ctx
->Extensions
.ARB_ES2_compatibility
) {
739 /* Flag the FBO as requiring validation. */
740 if (_mesa_is_user_fbo(fb
)) {
748 * Helper function to set the GL_DRAW_BUFFER state for the given context and
749 * FBO. Called via glDrawBuffer(), glDrawBuffersARB()
751 * All error checking will have been done prior to calling this function
752 * so nothing should go wrong at this point.
754 * \param ctx current context
755 * \param fb the desired draw buffer
756 * \param n number of color outputs to set
757 * \param buffers array[n] of colorbuffer names, like GL_LEFT.
758 * \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the
759 * colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
760 * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
763 _mesa_drawbuffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
764 GLuint n
, const GLenum16
*buffers
,
765 const GLbitfield
*destMask
)
767 GLbitfield mask
[MAX_DRAW_BUFFERS
];
771 /* compute destMask values now */
772 const GLbitfield supportedMask
= supported_buffer_bitmask(ctx
, fb
);
774 for (output
= 0; output
< n
; output
++) {
775 mask
[output
] = draw_buffer_enum_to_bitmask(ctx
, buffers
[output
]);
776 assert(mask
[output
] != BAD_MASK
);
777 mask
[output
] &= supportedMask
;
783 * destMask[0] may have up to four bits set
784 * (ex: glDrawBuffer(GL_FRONT_AND_BACK)).
785 * Otherwise, destMask[x] can only have one bit set.
787 if (n
> 0 && util_bitcount(destMask
[0]) > 1) {
788 GLuint count
= 0, destMask0
= destMask
[0];
790 const gl_buffer_index bufIndex
= u_bit_scan(&destMask0
);
791 if (fb
->_ColorDrawBufferIndexes
[count
] != bufIndex
) {
792 updated_drawbuffers(ctx
, fb
);
793 fb
->_ColorDrawBufferIndexes
[count
] = bufIndex
;
797 fb
->ColorDrawBuffer
[0] = buffers
[0];
798 fb
->_NumColorDrawBuffers
= count
;
802 for (buf
= 0; buf
< n
; buf
++ ) {
804 gl_buffer_index bufIndex
= ffs(destMask
[buf
]) - 1;
805 /* only one bit should be set in the destMask[buf] field */
806 assert(util_bitcount(destMask
[buf
]) == 1);
807 if (fb
->_ColorDrawBufferIndexes
[buf
] != bufIndex
) {
808 updated_drawbuffers(ctx
, fb
);
809 fb
->_ColorDrawBufferIndexes
[buf
] = bufIndex
;
814 if (fb
->_ColorDrawBufferIndexes
[buf
] != BUFFER_NONE
) {
815 updated_drawbuffers(ctx
, fb
);
816 fb
->_ColorDrawBufferIndexes
[buf
] = BUFFER_NONE
;
819 fb
->ColorDrawBuffer
[buf
] = buffers
[buf
];
821 fb
->_NumColorDrawBuffers
= count
;
824 /* set remaining outputs to BUFFER_NONE */
825 for (buf
= fb
->_NumColorDrawBuffers
; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
826 if (fb
->_ColorDrawBufferIndexes
[buf
] != BUFFER_NONE
) {
827 updated_drawbuffers(ctx
, fb
);
828 fb
->_ColorDrawBufferIndexes
[buf
] = BUFFER_NONE
;
831 for (buf
= n
; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
832 fb
->ColorDrawBuffer
[buf
] = GL_NONE
;
835 if (_mesa_is_winsys_fbo(fb
)) {
836 /* also set context drawbuffer state */
837 for (buf
= 0; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
838 if (ctx
->Color
.DrawBuffer
[buf
] != fb
->ColorDrawBuffer
[buf
]) {
839 updated_drawbuffers(ctx
, fb
);
840 ctx
->Color
.DrawBuffer
[buf
] = fb
->ColorDrawBuffer
[buf
];
848 * Update the current drawbuffer's _ColorDrawBufferIndex[] list, etc.
849 * from the context's Color.DrawBuffer[] state.
850 * Use when changing contexts.
853 _mesa_update_draw_buffers(struct gl_context
*ctx
)
855 /* should be a window system FBO */
856 assert(_mesa_is_winsys_fbo(ctx
->DrawBuffer
));
858 _mesa_drawbuffers(ctx
, ctx
->DrawBuffer
, ctx
->Const
.MaxDrawBuffers
,
859 ctx
->Color
.DrawBuffer
, NULL
);
864 * Like \sa _mesa_drawbuffers(), this is a helper function for setting
865 * GL_READ_BUFFER state for the given context and FBO.
866 * Note that all error checking should have been done before calling
868 * \param ctx the rendering context
869 * \param fb the framebuffer object to update
870 * \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc.
871 * \param bufferIndex the numerical index corresponding to 'buffer'
874 _mesa_readbuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
875 GLenum buffer
, gl_buffer_index bufferIndex
)
877 if ((fb
== ctx
->ReadBuffer
) && _mesa_is_winsys_fbo(fb
)) {
878 /* Only update the per-context READ_BUFFER state if we're bound to
879 * a window-system framebuffer.
881 ctx
->Pixel
.ReadBuffer
= buffer
;
884 fb
->ColorReadBuffer
= buffer
;
885 fb
->_ColorReadBufferIndex
= bufferIndex
;
887 ctx
->NewState
|= _NEW_BUFFERS
;
893 * Called by glReadBuffer and glNamedFramebufferReadBuffer to set the source
894 * renderbuffer for reading pixels.
895 * \param mode color buffer such as GL_FRONT, GL_BACK, etc.
897 static ALWAYS_INLINE
void
898 read_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
899 GLenum buffer
, const char *caller
, bool no_error
)
901 gl_buffer_index srcBuffer
;
903 FLUSH_VERTICES(ctx
, 0);
905 if (MESA_VERBOSE
& VERBOSE_API
)
906 _mesa_debug(ctx
, "%s %s\n", caller
, _mesa_enum_to_string(buffer
));
908 if (buffer
== GL_NONE
) {
909 /* This is legal--it means that no buffer should be bound for reading. */
910 srcBuffer
= BUFFER_NONE
;
913 /* general case / window-system framebuffer */
914 if (!no_error
&&_mesa_is_gles3(ctx
) &&
915 !is_legal_es3_readbuffer_enum(buffer
))
916 srcBuffer
= BUFFER_NONE
;
918 srcBuffer
= read_buffer_enum_to_index(ctx
, buffer
);
921 GLbitfield supportedMask
;
923 if (srcBuffer
== BUFFER_NONE
) {
924 _mesa_error(ctx
, GL_INVALID_ENUM
,
925 "%s(invalid buffer %s)", caller
,
926 _mesa_enum_to_string(buffer
));
930 supportedMask
= supported_buffer_bitmask(ctx
, fb
);
931 if (((1 << srcBuffer
) & supportedMask
) == 0) {
932 _mesa_error(ctx
, GL_INVALID_OPERATION
,
933 "%s(invalid buffer %s)", caller
,
934 _mesa_enum_to_string(buffer
));
940 /* OK, all error checking has been completed now */
942 _mesa_readbuffer(ctx
, fb
, buffer
, srcBuffer
);
944 /* Call the device driver function only if fb is the bound read buffer */
945 if (fb
== ctx
->ReadBuffer
) {
946 if (ctx
->Driver
.ReadBuffer
)
947 ctx
->Driver
.ReadBuffer(ctx
, buffer
);
953 read_buffer_err(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
954 GLenum buffer
, const char *caller
)
956 read_buffer(ctx
, fb
, buffer
, caller
, false);
961 read_buffer_no_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
962 GLenum buffer
, const char *caller
)
964 read_buffer(ctx
, fb
, buffer
, caller
, true);
969 _mesa_ReadBuffer_no_error(GLenum buffer
)
971 GET_CURRENT_CONTEXT(ctx
);
972 read_buffer_no_error(ctx
, ctx
->ReadBuffer
, buffer
, "glReadBuffer");
977 _mesa_ReadBuffer(GLenum buffer
)
979 GET_CURRENT_CONTEXT(ctx
);
980 read_buffer_err(ctx
, ctx
->ReadBuffer
, buffer
, "glReadBuffer");
985 _mesa_NamedFramebufferReadBuffer_no_error(GLuint framebuffer
, GLenum src
)
987 GET_CURRENT_CONTEXT(ctx
);
989 struct gl_framebuffer
*fb
;
992 fb
= _mesa_lookup_framebuffer(ctx
, framebuffer
);
994 fb
= ctx
->WinSysReadBuffer
;
997 read_buffer_no_error(ctx
, fb
, src
, "glNamedFramebufferReadBuffer");
1002 _mesa_FramebufferReadBufferEXT(GLuint framebuffer
, GLenum buf
)
1004 GET_CURRENT_CONTEXT(ctx
);
1005 struct gl_framebuffer
*fb
;
1008 fb
= _mesa_lookup_framebuffer_dsa(ctx
, framebuffer
,
1009 "glFramebufferReadBufferEXT");
1014 fb
= ctx
->WinSysDrawBuffer
;
1016 read_buffer_err(ctx
, fb
, buf
, "glFramebufferReadBufferEXT");
1021 _mesa_NamedFramebufferReadBuffer(GLuint framebuffer
, GLenum src
)
1023 GET_CURRENT_CONTEXT(ctx
);
1024 struct gl_framebuffer
*fb
;
1027 fb
= _mesa_lookup_framebuffer_err(ctx
, framebuffer
,
1028 "glNamedFramebufferReadBuffer");
1033 fb
= ctx
->WinSysReadBuffer
;
1035 read_buffer_err(ctx
, fb
, src
, "glNamedFramebufferReadBuffer");