2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 * Functions for allocating/managing framebuffers and renderbuffers.
28 * Also, routines for reading/writing renderbuffer data as ubytes,
29 * ushorts, uints, etc.
42 #include "framebuffer.h"
43 #include "renderbuffer.h"
49 * Compute/set the _DepthMax field for the given framebuffer.
50 * This value depends on the Z buffer resolution.
53 compute_depth_max(struct gl_framebuffer
*fb
)
55 if (fb
->Visual
.depthBits
== 0) {
56 /* Special case. Even if we don't have a depth buffer we need
57 * good values for DepthMax for Z vertex transformation purposes
58 * and for per-fragment fog computation.
60 fb
->_DepthMax
= (1 << 16) - 1;
62 else if (fb
->Visual
.depthBits
< 32) {
63 fb
->_DepthMax
= (1 << fb
->Visual
.depthBits
) - 1;
66 /* Special case since shift values greater than or equal to the
67 * number of bits in the left hand expression's type are undefined.
69 fb
->_DepthMax
= 0xffffffff;
71 fb
->_DepthMaxF
= (GLfloat
) fb
->_DepthMax
;
73 /* Minimum resolvable depth value, for polygon offset */
74 fb
->_MRD
= (GLfloat
)1.0 / fb
->_DepthMaxF
;
78 * Create and initialize a gl_framebuffer object.
79 * This is intended for creating _window_system_ framebuffers, not generic
80 * framebuffer objects ala GL_EXT_framebuffer_object.
82 * \sa _mesa_new_framebuffer
84 struct gl_framebuffer
*
85 _mesa_create_framebuffer(const struct gl_config
*visual
)
87 struct gl_framebuffer
*fb
= CALLOC_STRUCT(gl_framebuffer
);
90 _mesa_initialize_window_framebuffer(fb
, visual
);
97 * Allocate a new gl_framebuffer object.
98 * This is the default function for ctx->Driver.NewFramebuffer().
99 * This is for allocating user-created framebuffers, not window-system
101 * \sa _mesa_create_framebuffer
103 struct gl_framebuffer
*
104 _mesa_new_framebuffer(struct gl_context
*ctx
, GLuint name
)
106 struct gl_framebuffer
*fb
;
109 fb
= CALLOC_STRUCT(gl_framebuffer
);
111 _mesa_initialize_user_framebuffer(fb
, name
);
118 * Initialize a gl_framebuffer object. Typically used to initialize
119 * window system-created framebuffers, not user-created framebuffers.
120 * \sa _mesa_initialize_user_framebuffer
123 _mesa_initialize_window_framebuffer(struct gl_framebuffer
*fb
,
124 const struct gl_config
*visual
)
129 memset(fb
, 0, sizeof(struct gl_framebuffer
));
131 _glthread_INIT_MUTEX(fb
->Mutex
);
135 /* save the visual */
136 fb
->Visual
= *visual
;
138 /* Init read/draw renderbuffer state */
139 if (visual
->doubleBufferMode
) {
140 fb
->_NumColorDrawBuffers
= 1;
141 fb
->ColorDrawBuffer
[0] = GL_BACK
;
142 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_BACK_LEFT
;
143 fb
->ColorReadBuffer
= GL_BACK
;
144 fb
->_ColorReadBufferIndex
= BUFFER_BACK_LEFT
;
147 fb
->_NumColorDrawBuffers
= 1;
148 fb
->ColorDrawBuffer
[0] = GL_FRONT
;
149 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_FRONT_LEFT
;
150 fb
->ColorReadBuffer
= GL_FRONT
;
151 fb
->_ColorReadBufferIndex
= BUFFER_FRONT_LEFT
;
154 fb
->Delete
= _mesa_destroy_framebuffer
;
155 fb
->_Status
= GL_FRAMEBUFFER_COMPLETE_EXT
;
157 compute_depth_max(fb
);
162 * Initialize a user-created gl_framebuffer object.
163 * \sa _mesa_initialize_window_framebuffer
166 _mesa_initialize_user_framebuffer(struct gl_framebuffer
*fb
, GLuint name
)
171 memset(fb
, 0, sizeof(struct gl_framebuffer
));
175 fb
->_NumColorDrawBuffers
= 1;
176 fb
->ColorDrawBuffer
[0] = GL_COLOR_ATTACHMENT0_EXT
;
177 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_COLOR0
;
178 fb
->ColorReadBuffer
= GL_COLOR_ATTACHMENT0_EXT
;
179 fb
->_ColorReadBufferIndex
= BUFFER_COLOR0
;
180 fb
->Delete
= _mesa_destroy_framebuffer
;
181 _glthread_INIT_MUTEX(fb
->Mutex
);
186 * Deallocate buffer and everything attached to it.
187 * Typically called via the gl_framebuffer->Delete() method.
190 _mesa_destroy_framebuffer(struct gl_framebuffer
*fb
)
193 _mesa_free_framebuffer_data(fb
);
200 * Free all the data hanging off the given gl_framebuffer, but don't free
201 * the gl_framebuffer object itself.
204 _mesa_free_framebuffer_data(struct gl_framebuffer
*fb
)
209 assert(fb
->RefCount
== 0);
211 _glthread_DESTROY_MUTEX(fb
->Mutex
);
213 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
214 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
215 if (att
->Renderbuffer
) {
216 _mesa_reference_renderbuffer(&att
->Renderbuffer
, NULL
);
219 _mesa_reference_texobj(&att
->Texture
, NULL
);
221 ASSERT(!att
->Renderbuffer
);
222 ASSERT(!att
->Texture
);
229 * Set *ptr to point to fb, with refcounting and locking.
230 * This is normally only called from the _mesa_reference_framebuffer() macro
231 * when there's a real pointer change.
234 _mesa_reference_framebuffer_(struct gl_framebuffer
**ptr
,
235 struct gl_framebuffer
*fb
)
238 /* unreference old renderbuffer */
239 GLboolean deleteFlag
= GL_FALSE
;
240 struct gl_framebuffer
*oldFb
= *ptr
;
242 _glthread_LOCK_MUTEX(oldFb
->Mutex
);
243 ASSERT(oldFb
->RefCount
> 0);
245 deleteFlag
= (oldFb
->RefCount
== 0);
246 _glthread_UNLOCK_MUTEX(oldFb
->Mutex
);
249 oldFb
->Delete(oldFb
);
256 _glthread_LOCK_MUTEX(fb
->Mutex
);
258 _glthread_UNLOCK_MUTEX(fb
->Mutex
);
265 * Resize the given framebuffer's renderbuffers to the new width and height.
266 * This should only be used for window-system framebuffers, not
267 * user-created renderbuffers (i.e. made with GL_EXT_framebuffer_object).
268 * This will typically be called via ctx->Driver.ResizeBuffers() or directly
269 * from a device driver.
271 * \note it's possible for ctx to be null since a window can be resized
272 * without a currently bound rendering context.
275 _mesa_resize_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
276 GLuint width
, GLuint height
)
280 /* XXX I think we could check if the size is not changing
284 /* Can only resize win-sys framebuffer objects */
285 assert(_mesa_is_winsys_fbo(fb
));
287 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
288 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
289 if (att
->Type
== GL_RENDERBUFFER_EXT
&& att
->Renderbuffer
) {
290 struct gl_renderbuffer
*rb
= att
->Renderbuffer
;
291 /* only resize if size is changing */
292 if (rb
->Width
!= width
|| rb
->Height
!= height
) {
293 if (rb
->AllocStorage(ctx
, rb
, rb
->InternalFormat
, width
, height
)) {
294 ASSERT(rb
->Width
== width
);
295 ASSERT(rb
->Height
== height
);
298 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "Resizing framebuffer");
309 /* update scissor / window bounds */
310 _mesa_update_draw_buffer_bounds(ctx
);
311 /* Signal new buffer state so that swrast will update its clipping
312 * info (the CLIP_BIT flag).
314 ctx
->NewState
|= _NEW_BUFFERS
;
321 * XXX THIS IS OBSOLETE - drivers should take care of detecting window
322 * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
324 * GL_MESA_resize_buffers extension.
326 * When this function is called, we'll ask the window system how large
327 * the current window is. If it's a new size, we'll call the driver's
328 * ResizeBuffers function. The driver will then resize its color buffers
329 * as needed, and maybe call the swrast's routine for reallocating
330 * swrast-managed depth/stencil/accum/etc buffers.
331 * \note This function should only be called through the GL API, not
332 * from device drivers (as was done in the past).
335 _mesa_resizebuffers( struct gl_context
*ctx
)
337 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
339 if (MESA_VERBOSE
& VERBOSE_API
)
340 _mesa_debug(ctx
, "glResizeBuffersMESA\n");
342 if (!ctx
->Driver
.GetBufferSize
) {
346 if (ctx
->WinSysDrawBuffer
) {
347 GLuint newWidth
, newHeight
;
348 struct gl_framebuffer
*buffer
= ctx
->WinSysDrawBuffer
;
350 assert(buffer
->Name
== 0);
352 /* ask device driver for size of output buffer */
353 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
355 /* see if size of device driver's color buffer (window) has changed */
356 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
357 if (ctx
->Driver
.ResizeBuffers
)
358 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
362 if (ctx
->WinSysReadBuffer
363 && ctx
->WinSysReadBuffer
!= ctx
->WinSysDrawBuffer
) {
364 GLuint newWidth
, newHeight
;
365 struct gl_framebuffer
*buffer
= ctx
->WinSysReadBuffer
;
367 assert(buffer
->Name
== 0);
369 /* ask device driver for size of read buffer */
370 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
372 /* see if size of device driver's color buffer (window) has changed */
373 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
374 if (ctx
->Driver
.ResizeBuffers
)
375 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
379 ctx
->NewState
|= _NEW_BUFFERS
; /* to update scissor / window bounds */
384 * XXX THIS IS OBSOLETE
387 _mesa_ResizeBuffersMESA( void )
389 GET_CURRENT_CONTEXT(ctx
);
391 if (ctx
->Extensions
.MESA_resize_buffers
)
392 _mesa_resizebuffers( ctx
);
398 * Examine all the framebuffer's renderbuffers to update the Width/Height
399 * fields of the framebuffer. If we have renderbuffers with different
400 * sizes, set the framebuffer's width and height to the min size.
401 * Note: this is only intended for user-created framebuffers, not
402 * window-system framebuffes.
405 update_framebuffer_size(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
407 GLuint minWidth
= ~0, minHeight
= ~0;
410 /* user-created framebuffers only */
411 assert(_mesa_is_user_fbo(fb
));
413 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
414 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
415 const struct gl_renderbuffer
*rb
= att
->Renderbuffer
;
417 minWidth
= MIN2(minWidth
, rb
->Width
);
418 minHeight
= MIN2(minHeight
, rb
->Height
);
422 if (minWidth
!= ~0) {
423 fb
->Width
= minWidth
;
424 fb
->Height
= minHeight
;
434 * Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
435 * These values are computed from the buffer's width and height and
436 * the scissor box, if it's enabled.
437 * \param ctx the GL context.
440 _mesa_update_draw_buffer_bounds(struct gl_context
*ctx
)
442 struct gl_framebuffer
*buffer
= ctx
->DrawBuffer
;
448 /* user-created framebuffer size depends on the renderbuffers */
449 update_framebuffer_size(ctx
, buffer
);
454 buffer
->_Xmax
= buffer
->Width
;
455 buffer
->_Ymax
= buffer
->Height
;
457 if (ctx
->Scissor
.Enabled
) {
458 if (ctx
->Scissor
.X
> buffer
->_Xmin
) {
459 buffer
->_Xmin
= ctx
->Scissor
.X
;
461 if (ctx
->Scissor
.Y
> buffer
->_Ymin
) {
462 buffer
->_Ymin
= ctx
->Scissor
.Y
;
464 if (ctx
->Scissor
.X
+ ctx
->Scissor
.Width
< buffer
->_Xmax
) {
465 buffer
->_Xmax
= ctx
->Scissor
.X
+ ctx
->Scissor
.Width
;
467 if (ctx
->Scissor
.Y
+ ctx
->Scissor
.Height
< buffer
->_Ymax
) {
468 buffer
->_Ymax
= ctx
->Scissor
.Y
+ ctx
->Scissor
.Height
;
470 /* finally, check for empty region */
471 if (buffer
->_Xmin
> buffer
->_Xmax
) {
472 buffer
->_Xmin
= buffer
->_Xmax
;
474 if (buffer
->_Ymin
> buffer
->_Ymax
) {
475 buffer
->_Ymin
= buffer
->_Ymax
;
479 ASSERT(buffer
->_Xmin
<= buffer
->_Xmax
);
480 ASSERT(buffer
->_Ymin
<= buffer
->_Ymax
);
485 * The glGet queries of the framebuffer red/green/blue size, stencil size,
486 * etc. are satisfied by the fields of ctx->DrawBuffer->Visual. These can
487 * change depending on the renderbuffer bindings. This function updates
488 * the given framebuffer's Visual from the current renderbuffer bindings.
490 * This may apply to user-created framebuffers or window system framebuffers.
492 * Also note: ctx->DrawBuffer->Visual.depthBits might not equal
493 * ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer.DepthBits.
494 * The former one is used to convert floating point depth values into
498 _mesa_update_framebuffer_visual(struct gl_context
*ctx
,
499 struct gl_framebuffer
*fb
)
503 memset(&fb
->Visual
, 0, sizeof(fb
->Visual
));
504 fb
->Visual
.rgbMode
= GL_TRUE
; /* assume this */
506 #if 0 /* this _might_ be needed */
507 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
508 /* leave visual fields zero'd */
513 /* find first RGB renderbuffer */
514 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
515 if (fb
->Attachment
[i
].Renderbuffer
) {
516 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
517 const GLenum baseFormat
= _mesa_get_format_base_format(rb
->Format
);
518 const gl_format fmt
= rb
->Format
;
520 if (_mesa_is_legal_color_format(ctx
, baseFormat
)) {
521 fb
->Visual
.redBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
522 fb
->Visual
.greenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
523 fb
->Visual
.blueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
524 fb
->Visual
.alphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
525 fb
->Visual
.rgbBits
= fb
->Visual
.redBits
526 + fb
->Visual
.greenBits
+ fb
->Visual
.blueBits
;
527 fb
->Visual
.samples
= rb
->NumSamples
;
528 fb
->Visual
.sampleBuffers
= rb
->NumSamples
> 0 ? 1 : 0;
529 if (_mesa_get_format_color_encoding(fmt
) == GL_SRGB
)
530 fb
->Visual
.sRGBCapable
= ctx
->Extensions
.EXT_framebuffer_sRGB
;
536 fb
->Visual
.floatMode
= GL_FALSE
;
537 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
538 if (fb
->Attachment
[i
].Renderbuffer
) {
539 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
540 const gl_format fmt
= rb
->Format
;
542 if (_mesa_get_format_datatype(fmt
) == GL_FLOAT
) {
543 fb
->Visual
.floatMode
= GL_TRUE
;
549 if (fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
) {
550 const struct gl_renderbuffer
*rb
=
551 fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
552 const gl_format fmt
= rb
->Format
;
553 fb
->Visual
.haveDepthBuffer
= GL_TRUE
;
554 fb
->Visual
.depthBits
= _mesa_get_format_bits(fmt
, GL_DEPTH_BITS
);
557 if (fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
) {
558 const struct gl_renderbuffer
*rb
=
559 fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
560 const gl_format fmt
= rb
->Format
;
561 fb
->Visual
.haveStencilBuffer
= GL_TRUE
;
562 fb
->Visual
.stencilBits
= _mesa_get_format_bits(fmt
, GL_STENCIL_BITS
);
565 if (fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
) {
566 const struct gl_renderbuffer
*rb
=
567 fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
;
568 const gl_format fmt
= rb
->Format
;
569 fb
->Visual
.haveAccumBuffer
= GL_TRUE
;
570 fb
->Visual
.accumRedBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
571 fb
->Visual
.accumGreenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
572 fb
->Visual
.accumBlueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
573 fb
->Visual
.accumAlphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
576 compute_depth_max(fb
);
581 * Example DrawBuffers scenarios:
583 * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to
584 * "gl_FragColor" or program writes to the "result.color" register:
586 * fragment color output renderbuffer
587 * --------------------- ---------------
588 * color[0] Front, Back
591 * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to
592 * gl_FragData[i] or program writes to result.color[i] registers:
594 * fragment color output renderbuffer
595 * --------------------- ---------------
601 * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to
602 * gl_FragColor, or fixed function:
604 * fragment color output renderbuffer
605 * --------------------- ---------------
606 * color[0] Front, Aux0, Aux1
609 * In either case, the list of renderbuffers is stored in the
610 * framebuffer->_ColorDrawBuffers[] array and
611 * framebuffer->_NumColorDrawBuffers indicates the number of buffers.
612 * The renderer (like swrast) has to look at the current fragment shader
613 * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine
614 * how to map color outputs to renderbuffers.
616 * Note that these two calls are equivalent (for fixed function fragment
618 * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer)
619 * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]);
626 * Update the (derived) list of color drawing renderbuffer pointers.
627 * Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
631 update_color_draw_buffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
635 /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */
636 fb
->_ColorDrawBuffers
[0] = NULL
;
638 for (output
= 0; output
< fb
->_NumColorDrawBuffers
; output
++) {
639 GLint buf
= fb
->_ColorDrawBufferIndexes
[output
];
641 fb
->_ColorDrawBuffers
[output
] = fb
->Attachment
[buf
].Renderbuffer
;
644 fb
->_ColorDrawBuffers
[output
] = NULL
;
651 * Update the (derived) color read renderbuffer pointer.
652 * Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
655 update_color_read_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
658 if (fb
->_ColorReadBufferIndex
== -1 ||
662 fb
->_ColorReadBuffer
= NULL
; /* legal! */
665 ASSERT(fb
->_ColorReadBufferIndex
>= 0);
666 ASSERT(fb
->_ColorReadBufferIndex
< BUFFER_COUNT
);
668 = fb
->Attachment
[fb
->_ColorReadBufferIndex
].Renderbuffer
;
674 * Update a gl_framebuffer's derived state.
676 * Specifically, update these framebuffer fields:
678 * _NumColorDrawBuffers
681 * If the framebuffer is user-created, make sure it's complete.
683 * The following functions (at least) can effect framebuffer state:
684 * glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
685 * glRenderbufferStorageEXT.
688 update_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
690 if (_mesa_is_winsys_fbo(fb
)) {
691 /* This is a window-system framebuffer */
692 /* Need to update the FB's GL_DRAW_BUFFER state to match the
693 * context state (GL_READ_BUFFER too).
695 if (fb
->ColorDrawBuffer
[0] != ctx
->Color
.DrawBuffer
[0]) {
696 _mesa_drawbuffers(ctx
, ctx
->Const
.MaxDrawBuffers
,
697 ctx
->Color
.DrawBuffer
, NULL
);
701 /* This is a user-created framebuffer.
702 * Completeness only matters for user-created framebuffers.
704 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE
) {
705 _mesa_test_framebuffer_completeness(ctx
, fb
);
709 /* Strictly speaking, we don't need to update the draw-state
710 * if this FB is bound as ctx->ReadBuffer (and conversely, the
711 * read-state if this FB is bound as ctx->DrawBuffer), but no
714 update_color_draw_buffers(ctx
, fb
);
715 update_color_read_buffer(ctx
, fb
);
717 compute_depth_max(fb
);
722 * Update state related to the current draw/read framebuffers.
725 _mesa_update_framebuffer(struct gl_context
*ctx
)
727 struct gl_framebuffer
*drawFb
;
728 struct gl_framebuffer
*readFb
;
731 drawFb
= ctx
->DrawBuffer
;
732 readFb
= ctx
->ReadBuffer
;
734 update_framebuffer(ctx
, drawFb
);
735 if (readFb
!= drawFb
)
736 update_framebuffer(ctx
, readFb
);
741 * Check if the renderbuffer for a read/draw operation exists.
742 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
743 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
744 * \param reading if TRUE, we're going to read from the buffer,
745 if FALSE, we're going to write to the buffer.
746 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
749 renderbuffer_exists(struct gl_context
*ctx
,
750 struct gl_framebuffer
*fb
,
754 const struct gl_renderbuffer_attachment
*att
= fb
->Attachment
;
756 /* If we don't know the framebuffer status, update it now */
757 if (fb
->_Status
== 0) {
758 _mesa_test_framebuffer_completeness(ctx
, fb
);
761 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
772 case GL_LUMINANCE_ALPHA
:
780 case GL_RED_INTEGER_EXT
:
782 case GL_GREEN_INTEGER_EXT
:
783 case GL_BLUE_INTEGER_EXT
:
784 case GL_ALPHA_INTEGER_EXT
:
785 case GL_RGB_INTEGER_EXT
:
786 case GL_RGBA_INTEGER_EXT
:
787 case GL_BGR_INTEGER_EXT
:
788 case GL_BGRA_INTEGER_EXT
:
789 case GL_LUMINANCE_INTEGER_EXT
:
790 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
792 /* about to read from a color buffer */
793 const struct gl_renderbuffer
*readBuf
= fb
->_ColorReadBuffer
;
797 ASSERT(_mesa_get_format_bits(readBuf
->Format
, GL_RED_BITS
) > 0 ||
798 _mesa_get_format_bits(readBuf
->Format
, GL_ALPHA_BITS
) > 0 ||
799 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_LUMINANCE_SIZE
) > 0 ||
800 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_INTENSITY_SIZE
) > 0 ||
801 _mesa_get_format_bits(readBuf
->Format
, GL_INDEX_BITS
) > 0);
804 /* about to draw to zero or more color buffers (none is OK) */
809 case GL_DEPTH_COMPONENT
:
810 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
) {
815 case GL_STENCIL_INDEX
:
816 if (att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
820 case GL_DEPTH_STENCIL_EXT
:
821 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
||
822 att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
828 "Unexpected format 0x%x in renderbuffer_exists",
839 * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
840 * glCopyTex[Sub]Image, etc) exists.
841 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
842 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
843 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
846 _mesa_source_buffer_exists(struct gl_context
*ctx
, GLenum format
)
848 return renderbuffer_exists(ctx
, ctx
->ReadBuffer
, format
, GL_TRUE
);
853 * As above, but for drawing operations.
856 _mesa_dest_buffer_exists(struct gl_context
*ctx
, GLenum format
)
858 return renderbuffer_exists(ctx
, ctx
->DrawBuffer
, format
, GL_FALSE
);
863 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES query.
866 _mesa_get_color_read_format(struct gl_context
*ctx
)
868 switch (ctx
->ReadBuffer
->_ColorReadBuffer
->Format
) {
869 case MESA_FORMAT_ARGB8888
:
871 case MESA_FORMAT_RGB565
:
880 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES query.
883 _mesa_get_color_read_type(struct gl_context
*ctx
)
885 switch (ctx
->ReadBuffer
->_ColorReadBuffer
->Format
) {
886 case MESA_FORMAT_ARGB8888
:
887 return GL_UNSIGNED_BYTE
;
888 case MESA_FORMAT_RGB565
:
889 return GL_UNSIGNED_SHORT_5_6_5_REV
;
891 return GL_UNSIGNED_BYTE
;
897 * Print framebuffer info to stderr, for debugging.
900 _mesa_print_framebuffer(const struct gl_framebuffer
*fb
)
904 fprintf(stderr
, "Mesa Framebuffer %u at %p\n", fb
->Name
, (void *) fb
);
905 fprintf(stderr
, " Size: %u x %u Status: %s\n", fb
->Width
, fb
->Height
,
906 _mesa_lookup_enum_by_nr(fb
->_Status
));
907 fprintf(stderr
, " Attachments:\n");
909 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
910 const struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
911 if (att
->Type
== GL_TEXTURE
) {
912 const struct gl_texture_image
*texImage
=
913 _mesa_get_attachment_teximage_const(att
);
915 " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n",
916 i
, att
->Texture
->Name
, att
->TextureLevel
, att
->CubeMapFace
,
917 att
->Zoffset
, att
->Complete
);
918 fprintf(stderr
, " Size: %u x %u x %u Format %s\n",
919 texImage
->Width
, texImage
->Height
, texImage
->Depth
,
920 _mesa_get_format_name(texImage
->TexFormat
));
922 else if (att
->Type
== GL_RENDERBUFFER
) {
923 fprintf(stderr
, " %2d: Renderbuffer %u, complete %d\n",
924 i
, att
->Renderbuffer
->Name
, att
->Complete
);
925 fprintf(stderr
, " Size: %u x %u Format %s\n",
926 att
->Renderbuffer
->Width
, att
->Renderbuffer
->Height
,
927 _mesa_get_format_name(att
->Renderbuffer
->Format
));
930 fprintf(stderr
, " %2d: none\n", i
);