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 back_to_front_if_single_buffered(const struct gl_context
*ctx
, GLenum buffer
)
91 /* If the front buffer is the only buffer, GL_BACK and all other flags
92 * that include BACK select the front buffer for drawing. There are
93 * several reasons we want to do this.
95 * 1) OpenGL ES 3.0 requires it:
97 * Page 181 (page 192 of the PDF) in section 4.2.1 of the OpenGL
98 * ES 3.0.1 specification says:
100 * "When draw buffer zero is BACK, color values are written
101 * into the sole buffer for single-buffered contexts, or into
102 * the back buffer for double-buffered contexts."
104 * We also do this for GLES 1 and 2 because those APIs have no
105 * concept of selecting the front and back buffer anyway and it's
106 * convenient to be able to maintain the magic behaviour of
107 * GL_BACK in that case.
109 * 2) Pbuffers are back buffers from the application point of view,
110 * but they are front buffers from the Mesa point of view,
111 * because they are always single buffered.
113 if (!ctx
->DrawBuffer
->Visual
.doubleBufferMode
) {
119 buffer
= GL_FRONT_RIGHT
;
122 buffer
= GL_FRONT_LEFT
;
131 * Helper routine used by glDrawBuffer and glDrawBuffersARB.
132 * Given a GLenum naming one or more color buffers (such as
133 * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
136 draw_buffer_enum_to_bitmask(const struct gl_context
*ctx
, GLenum buffer
)
138 buffer
= back_to_front_if_single_buffered(ctx
, buffer
);
144 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_FRONT_RIGHT
;
146 return BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
148 return BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
150 return BUFFER_BIT_FRONT_RIGHT
;
152 return BUFFER_BIT_BACK_RIGHT
;
154 return BUFFER_BIT_BACK_LEFT
;
155 case GL_FRONT_AND_BACK
:
156 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
157 | BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
159 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
;
161 return BUFFER_BIT_FRONT_LEFT
;
163 return BUFFER_BIT_AUX0
;
167 return 1 << BUFFER_COUNT
; /* invalid, but not BAD_MASK */
168 case GL_COLOR_ATTACHMENT0_EXT
:
169 return BUFFER_BIT_COLOR0
;
170 case GL_COLOR_ATTACHMENT1_EXT
:
171 return BUFFER_BIT_COLOR1
;
172 case GL_COLOR_ATTACHMENT2_EXT
:
173 return BUFFER_BIT_COLOR2
;
174 case GL_COLOR_ATTACHMENT3_EXT
:
175 return BUFFER_BIT_COLOR3
;
176 case GL_COLOR_ATTACHMENT4_EXT
:
177 return BUFFER_BIT_COLOR4
;
178 case GL_COLOR_ATTACHMENT5_EXT
:
179 return BUFFER_BIT_COLOR5
;
180 case GL_COLOR_ATTACHMENT6_EXT
:
181 return BUFFER_BIT_COLOR6
;
182 case GL_COLOR_ATTACHMENT7_EXT
:
183 return BUFFER_BIT_COLOR7
;
185 /* not an error, but also not supported */
186 if (buffer
>= GL_COLOR_ATTACHMENT8
&& buffer
<= GL_COLOR_ATTACHMENT31
)
187 return 1 << BUFFER_COUNT
;
195 * Helper routine used by glReadBuffer.
196 * Given a GLenum naming a color buffer, return the index of the corresponding
197 * renderbuffer (a BUFFER_* value).
198 * return BUFFER_NONE for an invalid buffer.
200 static gl_buffer_index
201 read_buffer_enum_to_index(const struct gl_context
*ctx
, GLenum buffer
)
203 buffer
= back_to_front_if_single_buffered(ctx
, buffer
);
207 return BUFFER_FRONT_LEFT
;
209 return BUFFER_BACK_LEFT
;
211 return BUFFER_FRONT_RIGHT
;
213 return BUFFER_FRONT_RIGHT
;
215 return BUFFER_BACK_RIGHT
;
217 return BUFFER_BACK_LEFT
;
219 return BUFFER_FRONT_LEFT
;
221 return BUFFER_FRONT_LEFT
;
224 case GL_FRONT_AND_BACK
:
225 return BUFFER_FRONT_LEFT
;
229 return BUFFER_COUNT
; /* invalid, but not -1 */
230 case GL_COLOR_ATTACHMENT0_EXT
:
231 return BUFFER_COLOR0
;
232 case GL_COLOR_ATTACHMENT1_EXT
:
233 return BUFFER_COLOR1
;
234 case GL_COLOR_ATTACHMENT2_EXT
:
235 return BUFFER_COLOR2
;
236 case GL_COLOR_ATTACHMENT3_EXT
:
237 return BUFFER_COLOR3
;
238 case GL_COLOR_ATTACHMENT4_EXT
:
239 return BUFFER_COLOR4
;
240 case GL_COLOR_ATTACHMENT5_EXT
:
241 return BUFFER_COLOR5
;
242 case GL_COLOR_ATTACHMENT6_EXT
:
243 return BUFFER_COLOR6
;
244 case GL_COLOR_ATTACHMENT7_EXT
:
245 return BUFFER_COLOR7
;
247 /* not an error, but also not supported */
248 if (buffer
>= GL_COLOR_ATTACHMENT8
&& buffer
<= GL_COLOR_ATTACHMENT31
)
256 is_legal_es3_readbuffer_enum(GLenum buf
)
258 return buf
== GL_BACK
|| buf
== GL_NONE
||
259 (buf
>= GL_COLOR_ATTACHMENT0
&& buf
<= GL_COLOR_ATTACHMENT31
);
263 * Called by glDrawBuffer() and glNamedFramebufferDrawBuffer().
264 * Specify which renderbuffer(s) to draw into for the first color output.
265 * <buffer> can name zero, one, two or four renderbuffers!
266 * \sa _mesa_DrawBuffers
268 * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
270 * Note that the behaviour of this function depends on whether the
271 * current ctx->DrawBuffer is a window-system framebuffer or a user-created
272 * framebuffer object.
273 * In the former case, we update the per-context ctx->Color.DrawBuffer
274 * state var _and_ the FB's ColorDrawBuffer state.
275 * In the later case, we update the FB's ColorDrawBuffer state only.
277 * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the
278 * new FB is a window system FB, we need to re-update the FB's
279 * ColorDrawBuffer state to match the context. This is handled in
280 * _mesa_update_framebuffer().
282 * See the GL_EXT_framebuffer_object spec for more info.
284 static ALWAYS_INLINE
void
285 draw_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
286 GLenum buffer
, const char *caller
, bool no_error
)
290 FLUSH_VERTICES(ctx
, 0);
292 if (MESA_VERBOSE
& VERBOSE_API
) {
293 _mesa_debug(ctx
, "%s %s\n", caller
, _mesa_enum_to_string(buffer
));
296 if (buffer
== GL_NONE
) {
300 const GLbitfield supportedMask
301 = supported_buffer_bitmask(ctx
, fb
);
302 destMask
= draw_buffer_enum_to_bitmask(ctx
, buffer
);
303 if (!no_error
&& destMask
== BAD_MASK
) {
304 /* totally bogus buffer */
305 _mesa_error(ctx
, GL_INVALID_ENUM
, "%s(invalid buffer %s)", caller
,
306 _mesa_enum_to_string(buffer
));
309 destMask
&= supportedMask
;
310 if (!no_error
&& destMask
== 0x0) {
311 /* none of the named color buffers exist! */
312 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(invalid buffer %s)",
313 caller
, _mesa_enum_to_string(buffer
));
318 /* if we get here, there's no error so set new state */
319 const GLenum16 buffer16
= buffer
;
320 _mesa_drawbuffers(ctx
, fb
, 1, &buffer16
, &destMask
);
322 /* Call device driver function only if fb is the bound draw buffer */
323 if (fb
== ctx
->DrawBuffer
) {
324 if (ctx
->Driver
.DrawBuffer
)
325 ctx
->Driver
.DrawBuffer(ctx
);
326 if (ctx
->Driver
.DrawBufferAllocate
)
327 ctx
->Driver
.DrawBufferAllocate(ctx
);
333 draw_buffer_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
334 GLenum buffer
, const char *caller
)
336 draw_buffer(ctx
, fb
, buffer
, caller
, false);
341 draw_buffer_no_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
342 GLenum buffer
, const char *caller
)
344 draw_buffer(ctx
, fb
, buffer
, caller
, true);
349 _mesa_DrawBuffer_no_error(GLenum buffer
)
351 GET_CURRENT_CONTEXT(ctx
);
352 draw_buffer_no_error(ctx
, ctx
->DrawBuffer
, buffer
, "glDrawBuffer");
357 _mesa_DrawBuffer(GLenum buffer
)
359 GET_CURRENT_CONTEXT(ctx
);
360 draw_buffer_error(ctx
, ctx
->DrawBuffer
, buffer
, "glDrawBuffer");
365 _mesa_NamedFramebufferDrawBuffer_no_error(GLuint framebuffer
, GLenum buf
)
367 GET_CURRENT_CONTEXT(ctx
);
368 struct gl_framebuffer
*fb
;
371 fb
= _mesa_lookup_framebuffer(ctx
, framebuffer
);
373 fb
= ctx
->WinSysDrawBuffer
;
376 draw_buffer_no_error(ctx
, fb
, buf
, "glNamedFramebufferDrawBuffer");
381 _mesa_FramebufferDrawBufferEXT(GLuint framebuffer
, GLenum buf
)
383 GET_CURRENT_CONTEXT(ctx
);
384 struct gl_framebuffer
*fb
;
387 fb
= _mesa_lookup_framebuffer_dsa(ctx
, framebuffer
,
388 "glFramebufferDrawBufferEXT");
393 fb
= ctx
->WinSysDrawBuffer
;
395 draw_buffer_error(ctx
, fb
, buf
, "glFramebufferDrawBufferEXT");
400 _mesa_NamedFramebufferDrawBuffer(GLuint framebuffer
, GLenum buf
)
402 GET_CURRENT_CONTEXT(ctx
);
403 struct gl_framebuffer
*fb
;
406 fb
= _mesa_lookup_framebuffer_err(ctx
, framebuffer
,
407 "glNamedFramebufferDrawBuffer");
412 fb
= ctx
->WinSysDrawBuffer
;
414 draw_buffer_error(ctx
, fb
, buf
, "glNamedFramebufferDrawBuffer");
419 * Called by glDrawBuffersARB() and glNamedFramebufferDrawBuffers() to specify
420 * the destination color renderbuffers for N fragment program color outputs.
421 * \sa _mesa_DrawBuffer
422 * \param n number of outputs
423 * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
424 * names cannot specify more than one buffer. For example,
425 * GL_FRONT_AND_BACK is illegal. The only exception is GL_BACK
426 * that is considered special and allowed as far as n is one
429 static ALWAYS_INLINE
void
430 draw_buffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
, GLsizei n
,
431 const GLenum
*buffers
, const char *caller
, bool no_error
)
434 GLbitfield usedBufferMask
, supportedMask
;
435 GLbitfield destMask
[MAX_DRAW_BUFFERS
];
437 FLUSH_VERTICES(ctx
, 0);
440 /* Turns out n==0 is a valid input that should not produce an error.
441 * The remaining code below correctly handles the n==0 case.
443 * From the OpenGL 3.0 specification, page 258:
444 * "An INVALID_VALUE error is generated if n is greater than
448 _mesa_error(ctx
, GL_INVALID_VALUE
, "%s(n < 0)", caller
);
452 if (n
> (GLsizei
) ctx
->Const
.MaxDrawBuffers
) {
453 _mesa_error(ctx
, GL_INVALID_VALUE
,
454 "%s(n > maximum number of draw buffers)", caller
);
458 /* From the ES 3.0 specification, page 180:
459 * "If the GL is bound to the default framebuffer, then n must be 1
460 * and the constant must be BACK or NONE."
461 * (same restriction applies with GL_EXT_draw_buffers specification)
463 if (ctx
->API
== API_OPENGLES2
&& _mesa_is_winsys_fbo(fb
) &&
464 (n
!= 1 || (buffers
[0] != GL_NONE
&& buffers
[0] != GL_BACK
))) {
465 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(invalid buffers)", caller
);
470 supportedMask
= supported_buffer_bitmask(ctx
, fb
);
471 usedBufferMask
= 0x0;
473 /* complicated error checking... */
474 for (output
= 0; output
< n
; output
++) {
476 /* From the OpenGL 4.5 specification, page 493 (page 515 of the PDF)
477 * "An INVALID_ENUM error is generated if any value in bufs is FRONT,
478 * LEFT, RIGHT, or FRONT_AND_BACK . This restriction applies to both
479 * the default framebuffer and framebuffer objects, and exists because
480 * these constants may themselves refer to multiple buffers, as shown
483 * From the OpenGL 4.5 specification, page 492 (page 514 of the PDF):
484 * "If the default framebuffer is affected, then each of the constants
485 * must be one of the values listed in table 17.6 or the special value
486 * BACK. When BACK is used, n must be 1 and color values are written
487 * into the left buffer for single-buffered contexts, or into the back
488 * left buffer for double-buffered contexts."
490 * Note "special value BACK". GL_BACK also refers to multiple buffers,
491 * but it is consider a special case here. This is a change on 4.5.
492 * For OpenGL 4.x we check that behaviour. For any previous version we
493 * keep considering it wrong (as INVALID_ENUM).
495 if (buffers
[output
] == GL_BACK
&&
496 _mesa_is_winsys_fbo(fb
) &&
497 _mesa_is_desktop_gl(ctx
) &&
498 ctx
->Version
>= 40) {
500 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(with GL_BACK n must be 1)",
504 } else if (buffers
[output
] == GL_FRONT
||
505 buffers
[output
] == GL_LEFT
||
506 buffers
[output
] == GL_RIGHT
||
507 buffers
[output
] == GL_FRONT_AND_BACK
||
508 (buffers
[output
] == GL_BACK
&&
509 _mesa_is_desktop_gl(ctx
))) {
510 _mesa_error(ctx
, GL_INVALID_ENUM
, "%s(invalid buffer %s)",
511 caller
, _mesa_enum_to_string(buffers
[output
]));
516 destMask
[output
] = draw_buffer_enum_to_bitmask(ctx
, buffers
[output
]);
519 /* From the OpenGL 3.0 specification, page 258:
520 * "Each buffer listed in bufs must be one of the values from tables
521 * 4.5 or 4.6. Otherwise, an INVALID_ENUM error is generated.
523 if (destMask
[output
] == BAD_MASK
) {
524 _mesa_error(ctx
, GL_INVALID_ENUM
, "%s(invalid buffer %s)",
525 caller
, _mesa_enum_to_string(buffers
[output
]));
529 /* Section 4.2 (Whole Framebuffer Operations) of the OpenGL ES 3.0
530 * specification says:
532 * "If the GL is bound to a draw framebuffer object, the ith
533 * buffer listed in bufs must be COLOR_ATTACHMENTi or NONE .
534 * Specifying a buffer out of order, BACK , or COLOR_ATTACHMENTm
535 * where m is greater than or equal to the value of MAX_-
536 * COLOR_ATTACHMENTS , will generate the error INVALID_OPERATION .
538 if (_mesa_is_gles3(ctx
) && _mesa_is_user_fbo(fb
) &&
539 buffers
[output
] != GL_NONE
&&
540 (buffers
[output
] < GL_COLOR_ATTACHMENT0
||
541 buffers
[output
] >= GL_COLOR_ATTACHMENT0
+ ctx
->Const
.MaxColorAttachments
)) {
542 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffers(buffer)");
547 if (buffers
[output
] == GL_NONE
) {
548 destMask
[output
] = 0x0;
551 /* Page 259 (page 275 of the PDF) in section 4.2.1 of the OpenGL 3.0
552 * spec (20080923) says:
554 * "If the GL is bound to a framebuffer object and DrawBuffers is
555 * supplied with [...] COLOR_ATTACHMENTm where m is greater than
556 * or equal to the value of MAX_COLOR_ATTACHMENTS, then the error
557 * INVALID_OPERATION results."
559 if (!no_error
&& _mesa_is_user_fbo(fb
) && buffers
[output
] >=
560 GL_COLOR_ATTACHMENT0
+ ctx
->Const
.MaxDrawBuffers
) {
561 _mesa_error(ctx
, GL_INVALID_OPERATION
,
562 "%s(buffers[%d] >= maximum number of draw buffers)",
567 /* From the OpenGL 3.0 specification, page 259:
568 * "If the GL is bound to the default framebuffer and DrawBuffers is
569 * supplied with a constant (other than NONE) that does not indicate
570 * any of the color buffers allocated to the GL context by the window
571 * system, the error INVALID_OPERATION will be generated.
573 * If the GL is bound to a framebuffer object and DrawBuffers is
574 * supplied with a constant from table 4.6 [...] then the error
575 * INVALID_OPERATION results."
577 destMask
[output
] &= supportedMask
;
579 if (destMask
[output
] == 0) {
580 _mesa_error(ctx
, GL_INVALID_OPERATION
,
581 "%s(unsupported buffer %s)",
582 caller
, _mesa_enum_to_string(buffers
[output
]));
586 /* ES 3.0 is even more restrictive. From the ES 3.0 spec, page 180:
587 * "If the GL is bound to a framebuffer object, the ith buffer
588 * listed in bufs must be COLOR_ATTACHMENTi or NONE. [...]
589 * INVALID_OPERATION." (same restriction applies with
590 * GL_EXT_draw_buffers specification)
592 if (ctx
->API
== API_OPENGLES2
&& _mesa_is_user_fbo(fb
) &&
593 buffers
[output
] != GL_NONE
&&
594 buffers
[output
] != GL_COLOR_ATTACHMENT0
+ output
) {
595 _mesa_error(ctx
, GL_INVALID_OPERATION
,
596 "%s(unsupported buffer %s)",
597 caller
, _mesa_enum_to_string(buffers
[output
]));
601 /* From the OpenGL 3.0 specification, page 258:
602 * "Except for NONE, a buffer may not appear more than once in the
603 * array pointed to by bufs. Specifying a buffer more then once
604 * will result in the error INVALID_OPERATION."
606 if (destMask
[output
] & usedBufferMask
) {
607 _mesa_error(ctx
, GL_INVALID_OPERATION
,
608 "%s(duplicated buffer %s)",
609 caller
, _mesa_enum_to_string(buffers
[output
]));
615 usedBufferMask
|= destMask
[output
];
619 /* OK, if we get here, there were no errors so set the new state */
620 GLenum16 buffers16
[MAX_DRAW_BUFFERS
];
621 for (int i
= 0; i
< n
; i
++)
622 buffers16
[i
] = buffers
[i
];
624 _mesa_drawbuffers(ctx
, fb
, n
, buffers16
, destMask
);
627 * Call device driver function if fb is the bound draw buffer.
628 * Note that n can be equal to 0,
629 * in which case we don't want to reference buffers[0], which
632 if (fb
== ctx
->DrawBuffer
) {
633 if (ctx
->Driver
.DrawBuffer
)
634 ctx
->Driver
.DrawBuffer(ctx
);
635 if (ctx
->Driver
.DrawBufferAllocate
)
636 ctx
->Driver
.DrawBufferAllocate(ctx
);
642 draw_buffers_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
, GLsizei n
,
643 const GLenum
*buffers
, const char *caller
)
645 draw_buffers(ctx
, fb
, n
, buffers
, caller
, false);
650 draw_buffers_no_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
651 GLsizei n
, const GLenum
*buffers
, const char *caller
)
653 draw_buffers(ctx
, fb
, n
, buffers
, caller
, true);
658 _mesa_DrawBuffers_no_error(GLsizei n
, const GLenum
*buffers
)
660 GET_CURRENT_CONTEXT(ctx
);
661 draw_buffers_no_error(ctx
, ctx
->DrawBuffer
, n
, buffers
, "glDrawBuffers");
666 _mesa_DrawBuffers(GLsizei n
, const GLenum
*buffers
)
668 GET_CURRENT_CONTEXT(ctx
);
669 draw_buffers_error(ctx
, ctx
->DrawBuffer
, n
, buffers
, "glDrawBuffers");
673 _mesa_FramebufferDrawBuffersEXT(GLuint framebuffer
, GLsizei n
,
676 GET_CURRENT_CONTEXT(ctx
);
677 struct gl_framebuffer
*fb
;
680 fb
= _mesa_lookup_framebuffer_dsa(ctx
, framebuffer
,
681 "glFramebufferDrawBuffersEXT");
686 fb
= ctx
->WinSysDrawBuffer
;
688 draw_buffers_error(ctx
, fb
, n
, bufs
, "glFramebufferDrawBuffersEXT");
692 _mesa_NamedFramebufferDrawBuffers_no_error(GLuint framebuffer
, GLsizei n
,
695 GET_CURRENT_CONTEXT(ctx
);
696 struct gl_framebuffer
*fb
;
699 fb
= _mesa_lookup_framebuffer(ctx
, framebuffer
);
701 fb
= ctx
->WinSysDrawBuffer
;
704 draw_buffers_no_error(ctx
, fb
, n
, bufs
, "glNamedFramebufferDrawBuffers");
709 _mesa_NamedFramebufferDrawBuffers(GLuint framebuffer
, GLsizei n
,
712 GET_CURRENT_CONTEXT(ctx
);
713 struct gl_framebuffer
*fb
;
716 fb
= _mesa_lookup_framebuffer_err(ctx
, framebuffer
,
717 "glNamedFramebufferDrawBuffers");
722 fb
= ctx
->WinSysDrawBuffer
;
724 draw_buffers_error(ctx
, fb
, n
, bufs
, "glNamedFramebufferDrawBuffers");
729 * Performs necessary state updates when _mesa_drawbuffers makes an
733 updated_drawbuffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
735 FLUSH_VERTICES(ctx
, _NEW_BUFFERS
);
737 if (ctx
->API
== API_OPENGL_COMPAT
&& !ctx
->Extensions
.ARB_ES2_compatibility
) {
738 /* Flag the FBO as requiring validation. */
739 if (_mesa_is_user_fbo(fb
)) {
747 * Helper function to set the GL_DRAW_BUFFER state for the given context and
748 * FBO. Called via glDrawBuffer(), glDrawBuffersARB()
750 * All error checking will have been done prior to calling this function
751 * so nothing should go wrong at this point.
753 * \param ctx current context
754 * \param fb the desired draw buffer
755 * \param n number of color outputs to set
756 * \param buffers array[n] of colorbuffer names, like GL_LEFT.
757 * \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the
758 * colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
759 * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
762 _mesa_drawbuffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
763 GLuint n
, const GLenum16
*buffers
,
764 const GLbitfield
*destMask
)
766 GLbitfield mask
[MAX_DRAW_BUFFERS
];
770 /* compute destMask values now */
771 const GLbitfield supportedMask
= supported_buffer_bitmask(ctx
, fb
);
773 for (output
= 0; output
< n
; output
++) {
774 mask
[output
] = draw_buffer_enum_to_bitmask(ctx
, buffers
[output
]);
775 assert(mask
[output
] != BAD_MASK
);
776 mask
[output
] &= supportedMask
;
782 * destMask[0] may have up to four bits set
783 * (ex: glDrawBuffer(GL_FRONT_AND_BACK)).
784 * Otherwise, destMask[x] can only have one bit set.
786 if (n
> 0 && util_bitcount(destMask
[0]) > 1) {
787 GLuint count
= 0, destMask0
= destMask
[0];
789 const gl_buffer_index bufIndex
= u_bit_scan(&destMask0
);
790 if (fb
->_ColorDrawBufferIndexes
[count
] != bufIndex
) {
791 updated_drawbuffers(ctx
, fb
);
792 fb
->_ColorDrawBufferIndexes
[count
] = bufIndex
;
796 fb
->ColorDrawBuffer
[0] = buffers
[0];
797 fb
->_NumColorDrawBuffers
= count
;
801 for (buf
= 0; buf
< n
; buf
++ ) {
803 gl_buffer_index bufIndex
= ffs(destMask
[buf
]) - 1;
804 /* only one bit should be set in the destMask[buf] field */
805 assert(util_bitcount(destMask
[buf
]) == 1);
806 if (fb
->_ColorDrawBufferIndexes
[buf
] != bufIndex
) {
807 updated_drawbuffers(ctx
, fb
);
808 fb
->_ColorDrawBufferIndexes
[buf
] = bufIndex
;
813 if (fb
->_ColorDrawBufferIndexes
[buf
] != BUFFER_NONE
) {
814 updated_drawbuffers(ctx
, fb
);
815 fb
->_ColorDrawBufferIndexes
[buf
] = BUFFER_NONE
;
818 fb
->ColorDrawBuffer
[buf
] = buffers
[buf
];
820 fb
->_NumColorDrawBuffers
= count
;
823 /* set remaining outputs to BUFFER_NONE */
824 for (buf
= fb
->_NumColorDrawBuffers
; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
825 if (fb
->_ColorDrawBufferIndexes
[buf
] != BUFFER_NONE
) {
826 updated_drawbuffers(ctx
, fb
);
827 fb
->_ColorDrawBufferIndexes
[buf
] = BUFFER_NONE
;
830 for (buf
= n
; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
831 fb
->ColorDrawBuffer
[buf
] = GL_NONE
;
834 if (_mesa_is_winsys_fbo(fb
)) {
835 /* also set context drawbuffer state */
836 for (buf
= 0; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
837 if (ctx
->Color
.DrawBuffer
[buf
] != fb
->ColorDrawBuffer
[buf
]) {
838 updated_drawbuffers(ctx
, fb
);
839 ctx
->Color
.DrawBuffer
[buf
] = fb
->ColorDrawBuffer
[buf
];
847 * Update the current drawbuffer's _ColorDrawBufferIndex[] list, etc.
848 * from the context's Color.DrawBuffer[] state.
849 * Use when changing contexts.
852 _mesa_update_draw_buffers(struct gl_context
*ctx
)
854 /* should be a window system FBO */
855 assert(_mesa_is_winsys_fbo(ctx
->DrawBuffer
));
857 _mesa_drawbuffers(ctx
, ctx
->DrawBuffer
, ctx
->Const
.MaxDrawBuffers
,
858 ctx
->Color
.DrawBuffer
, NULL
);
863 * Like \sa _mesa_drawbuffers(), this is a helper function for setting
864 * GL_READ_BUFFER state for the given context and FBO.
865 * Note that all error checking should have been done before calling
867 * \param ctx the rendering context
868 * \param fb the framebuffer object to update
869 * \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc.
870 * \param bufferIndex the numerical index corresponding to 'buffer'
873 _mesa_readbuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
874 GLenum buffer
, gl_buffer_index bufferIndex
)
876 if ((fb
== ctx
->ReadBuffer
) && _mesa_is_winsys_fbo(fb
)) {
877 /* Only update the per-context READ_BUFFER state if we're bound to
878 * a window-system framebuffer.
880 ctx
->Pixel
.ReadBuffer
= buffer
;
883 fb
->ColorReadBuffer
= buffer
;
884 fb
->_ColorReadBufferIndex
= bufferIndex
;
886 ctx
->NewState
|= _NEW_BUFFERS
;
892 * Called by glReadBuffer and glNamedFramebufferReadBuffer to set the source
893 * renderbuffer for reading pixels.
894 * \param mode color buffer such as GL_FRONT, GL_BACK, etc.
896 static ALWAYS_INLINE
void
897 read_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
898 GLenum buffer
, const char *caller
, bool no_error
)
900 gl_buffer_index srcBuffer
;
902 FLUSH_VERTICES(ctx
, 0);
904 if (MESA_VERBOSE
& VERBOSE_API
)
905 _mesa_debug(ctx
, "%s %s\n", caller
, _mesa_enum_to_string(buffer
));
907 if (buffer
== GL_NONE
) {
908 /* This is legal--it means that no buffer should be bound for reading. */
909 srcBuffer
= BUFFER_NONE
;
912 /* general case / window-system framebuffer */
913 if (!no_error
&&_mesa_is_gles3(ctx
) &&
914 !is_legal_es3_readbuffer_enum(buffer
))
915 srcBuffer
= BUFFER_NONE
;
917 srcBuffer
= read_buffer_enum_to_index(ctx
, buffer
);
920 GLbitfield supportedMask
;
922 if (srcBuffer
== BUFFER_NONE
) {
923 _mesa_error(ctx
, GL_INVALID_ENUM
,
924 "%s(invalid buffer %s)", caller
,
925 _mesa_enum_to_string(buffer
));
929 supportedMask
= supported_buffer_bitmask(ctx
, fb
);
930 if (((1 << srcBuffer
) & supportedMask
) == 0) {
931 _mesa_error(ctx
, GL_INVALID_OPERATION
,
932 "%s(invalid buffer %s)", caller
,
933 _mesa_enum_to_string(buffer
));
939 /* OK, all error checking has been completed now */
941 _mesa_readbuffer(ctx
, fb
, buffer
, srcBuffer
);
943 /* Call the device driver function only if fb is the bound read buffer */
944 if (fb
== ctx
->ReadBuffer
) {
945 if (ctx
->Driver
.ReadBuffer
)
946 ctx
->Driver
.ReadBuffer(ctx
, buffer
);
952 read_buffer_err(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
953 GLenum buffer
, const char *caller
)
955 read_buffer(ctx
, fb
, buffer
, caller
, false);
960 read_buffer_no_error(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
961 GLenum buffer
, const char *caller
)
963 read_buffer(ctx
, fb
, buffer
, caller
, true);
968 _mesa_ReadBuffer_no_error(GLenum buffer
)
970 GET_CURRENT_CONTEXT(ctx
);
971 read_buffer_no_error(ctx
, ctx
->ReadBuffer
, buffer
, "glReadBuffer");
976 _mesa_ReadBuffer(GLenum buffer
)
978 GET_CURRENT_CONTEXT(ctx
);
979 read_buffer_err(ctx
, ctx
->ReadBuffer
, buffer
, "glReadBuffer");
984 _mesa_NamedFramebufferReadBuffer_no_error(GLuint framebuffer
, GLenum src
)
986 GET_CURRENT_CONTEXT(ctx
);
988 struct gl_framebuffer
*fb
;
991 fb
= _mesa_lookup_framebuffer(ctx
, framebuffer
);
993 fb
= ctx
->WinSysReadBuffer
;
996 read_buffer_no_error(ctx
, fb
, src
, "glNamedFramebufferReadBuffer");
1001 _mesa_FramebufferReadBufferEXT(GLuint framebuffer
, GLenum buf
)
1003 GET_CURRENT_CONTEXT(ctx
);
1004 struct gl_framebuffer
*fb
;
1007 fb
= _mesa_lookup_framebuffer_dsa(ctx
, framebuffer
,
1008 "glFramebufferReadBufferEXT");
1013 fb
= ctx
->WinSysDrawBuffer
;
1015 read_buffer_err(ctx
, fb
, buf
, "glFramebufferReadBufferEXT");
1020 _mesa_NamedFramebufferReadBuffer(GLuint framebuffer
, GLenum src
)
1022 GET_CURRENT_CONTEXT(ctx
);
1023 struct gl_framebuffer
*fb
;
1026 fb
= _mesa_lookup_framebuffer_err(ctx
, framebuffer
,
1027 "glNamedFramebufferReadBuffer");
1032 fb
= ctx
->WinSysReadBuffer
;
1034 read_buffer_err(ctx
, fb
, src
, "glNamedFramebufferReadBuffer");