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
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14 * The above copyright notice and this permission notice shall be included
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18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
28 * Functions for allocating/managing framebuffers and renderbuffers.
29 * Also, routines for reading/writing renderbuffer data as ubytes,
30 * ushorts, uints, etc.
44 #include "framebuffer.h"
45 #include "renderbuffer.h"
47 #include "glformats.h"
52 * Compute/set the _DepthMax field for the given framebuffer.
53 * This value depends on the Z buffer resolution.
56 compute_depth_max(struct gl_framebuffer
*fb
)
58 if (fb
->Visual
.depthBits
== 0) {
59 /* Special case. Even if we don't have a depth buffer we need
60 * good values for DepthMax for Z vertex transformation purposes
61 * and for per-fragment fog computation.
63 fb
->_DepthMax
= (1 << 16) - 1;
65 else if (fb
->Visual
.depthBits
< 32) {
66 fb
->_DepthMax
= (1 << fb
->Visual
.depthBits
) - 1;
69 /* Special case since shift values greater than or equal to the
70 * number of bits in the left hand expression's type are undefined.
72 fb
->_DepthMax
= 0xffffffff;
74 fb
->_DepthMaxF
= (GLfloat
) fb
->_DepthMax
;
76 /* Minimum resolvable depth value, for polygon offset */
77 fb
->_MRD
= (GLfloat
)1.0 / fb
->_DepthMaxF
;
81 * Create and initialize a gl_framebuffer object.
82 * This is intended for creating _window_system_ framebuffers, not generic
83 * framebuffer objects ala GL_EXT_framebuffer_object.
85 * \sa _mesa_new_framebuffer
87 struct gl_framebuffer
*
88 _mesa_create_framebuffer(const struct gl_config
*visual
)
90 struct gl_framebuffer
*fb
= CALLOC_STRUCT(gl_framebuffer
);
93 _mesa_initialize_window_framebuffer(fb
, visual
);
100 * Allocate a new gl_framebuffer object.
101 * This is the default function for ctx->Driver.NewFramebuffer().
102 * This is for allocating user-created framebuffers, not window-system
104 * \sa _mesa_create_framebuffer
106 struct gl_framebuffer
*
107 _mesa_new_framebuffer(struct gl_context
*ctx
, GLuint name
)
109 struct gl_framebuffer
*fb
;
112 fb
= CALLOC_STRUCT(gl_framebuffer
);
114 _mesa_initialize_user_framebuffer(fb
, name
);
121 * Initialize a gl_framebuffer object. Typically used to initialize
122 * window system-created framebuffers, not user-created framebuffers.
123 * \sa _mesa_initialize_user_framebuffer
126 _mesa_initialize_window_framebuffer(struct gl_framebuffer
*fb
,
127 const struct gl_config
*visual
)
132 memset(fb
, 0, sizeof(struct gl_framebuffer
));
134 _glthread_INIT_MUTEX(fb
->Mutex
);
138 /* save the visual */
139 fb
->Visual
= *visual
;
141 /* Init read/draw renderbuffer state */
142 if (visual
->doubleBufferMode
) {
143 fb
->_NumColorDrawBuffers
= 1;
144 fb
->ColorDrawBuffer
[0] = GL_BACK
;
145 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_BACK_LEFT
;
146 fb
->ColorReadBuffer
= GL_BACK
;
147 fb
->_ColorReadBufferIndex
= BUFFER_BACK_LEFT
;
150 fb
->_NumColorDrawBuffers
= 1;
151 fb
->ColorDrawBuffer
[0] = GL_FRONT
;
152 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_FRONT_LEFT
;
153 fb
->ColorReadBuffer
= GL_FRONT
;
154 fb
->_ColorReadBufferIndex
= BUFFER_FRONT_LEFT
;
157 fb
->Delete
= _mesa_destroy_framebuffer
;
158 fb
->_Status
= GL_FRAMEBUFFER_COMPLETE_EXT
;
159 fb
->_AllColorBuffersFixedPoint
= !visual
->floatMode
;
160 fb
->_HasSNormOrFloatColorBuffer
= visual
->floatMode
;
162 compute_depth_max(fb
);
167 * Initialize a user-created gl_framebuffer object.
168 * \sa _mesa_initialize_window_framebuffer
171 _mesa_initialize_user_framebuffer(struct gl_framebuffer
*fb
, GLuint name
)
176 memset(fb
, 0, sizeof(struct gl_framebuffer
));
180 fb
->_NumColorDrawBuffers
= 1;
181 fb
->ColorDrawBuffer
[0] = GL_COLOR_ATTACHMENT0_EXT
;
182 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_COLOR0
;
183 fb
->ColorReadBuffer
= GL_COLOR_ATTACHMENT0_EXT
;
184 fb
->_ColorReadBufferIndex
= BUFFER_COLOR0
;
185 fb
->Delete
= _mesa_destroy_framebuffer
;
186 _glthread_INIT_MUTEX(fb
->Mutex
);
191 * Deallocate buffer and everything attached to it.
192 * Typically called via the gl_framebuffer->Delete() method.
195 _mesa_destroy_framebuffer(struct gl_framebuffer
*fb
)
198 _mesa_free_framebuffer_data(fb
);
205 * Free all the data hanging off the given gl_framebuffer, but don't free
206 * the gl_framebuffer object itself.
209 _mesa_free_framebuffer_data(struct gl_framebuffer
*fb
)
214 assert(fb
->RefCount
== 0);
216 _glthread_DESTROY_MUTEX(fb
->Mutex
);
218 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
219 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
220 if (att
->Renderbuffer
) {
221 _mesa_reference_renderbuffer(&att
->Renderbuffer
, NULL
);
224 _mesa_reference_texobj(&att
->Texture
, NULL
);
226 ASSERT(!att
->Renderbuffer
);
227 ASSERT(!att
->Texture
);
234 * Set *ptr to point to fb, with refcounting and locking.
235 * This is normally only called from the _mesa_reference_framebuffer() macro
236 * when there's a real pointer change.
239 _mesa_reference_framebuffer_(struct gl_framebuffer
**ptr
,
240 struct gl_framebuffer
*fb
)
243 /* unreference old renderbuffer */
244 GLboolean deleteFlag
= GL_FALSE
;
245 struct gl_framebuffer
*oldFb
= *ptr
;
247 _glthread_LOCK_MUTEX(oldFb
->Mutex
);
248 ASSERT(oldFb
->RefCount
> 0);
250 deleteFlag
= (oldFb
->RefCount
== 0);
251 _glthread_UNLOCK_MUTEX(oldFb
->Mutex
);
254 oldFb
->Delete(oldFb
);
261 _glthread_LOCK_MUTEX(fb
->Mutex
);
263 _glthread_UNLOCK_MUTEX(fb
->Mutex
);
270 * Resize the given framebuffer's renderbuffers to the new width and height.
271 * This should only be used for window-system framebuffers, not
272 * user-created renderbuffers (i.e. made with GL_EXT_framebuffer_object).
273 * This will typically be called via ctx->Driver.ResizeBuffers() or directly
274 * from a device driver.
276 * \note it's possible for ctx to be null since a window can be resized
277 * without a currently bound rendering context.
280 _mesa_resize_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
281 GLuint width
, GLuint height
)
285 /* XXX I think we could check if the size is not changing
289 /* Can only resize win-sys framebuffer objects */
290 assert(_mesa_is_winsys_fbo(fb
));
292 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
293 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
294 if (att
->Type
== GL_RENDERBUFFER_EXT
&& att
->Renderbuffer
) {
295 struct gl_renderbuffer
*rb
= att
->Renderbuffer
;
296 /* only resize if size is changing */
297 if (rb
->Width
!= width
|| rb
->Height
!= height
) {
298 if (rb
->AllocStorage(ctx
, rb
, rb
->InternalFormat
, width
, height
)) {
299 ASSERT(rb
->Width
== width
);
300 ASSERT(rb
->Height
== height
);
303 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "Resizing framebuffer");
314 /* update scissor / window bounds */
315 _mesa_update_draw_buffer_bounds(ctx
);
316 /* Signal new buffer state so that swrast will update its clipping
317 * info (the CLIP_BIT flag).
319 ctx
->NewState
|= _NEW_BUFFERS
;
326 * XXX THIS IS OBSOLETE - drivers should take care of detecting window
327 * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
329 * GL_MESA_resize_buffers extension.
331 * When this function is called, we'll ask the window system how large
332 * the current window is. If it's a new size, we'll call the driver's
333 * ResizeBuffers function. The driver will then resize its color buffers
334 * as needed, and maybe call the swrast's routine for reallocating
335 * swrast-managed depth/stencil/accum/etc buffers.
336 * \note This function should only be called through the GL API, not
337 * from device drivers (as was done in the past).
340 _mesa_resizebuffers( struct gl_context
*ctx
)
342 FLUSH_VERTICES(ctx
, 0);
344 if (MESA_VERBOSE
& VERBOSE_API
)
345 _mesa_debug(ctx
, "glResizeBuffersMESA\n");
347 if (!ctx
->Driver
.GetBufferSize
) {
351 if (ctx
->WinSysDrawBuffer
) {
352 GLuint newWidth
, newHeight
;
353 struct gl_framebuffer
*buffer
= ctx
->WinSysDrawBuffer
;
355 assert(_mesa_is_winsys_fbo(buffer
));
357 /* ask device driver for size of output buffer */
358 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
360 /* see if size of device driver's color buffer (window) has changed */
361 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
362 if (ctx
->Driver
.ResizeBuffers
)
363 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
367 if (ctx
->WinSysReadBuffer
368 && ctx
->WinSysReadBuffer
!= ctx
->WinSysDrawBuffer
) {
369 GLuint newWidth
, newHeight
;
370 struct gl_framebuffer
*buffer
= ctx
->WinSysReadBuffer
;
372 assert(_mesa_is_winsys_fbo(buffer
));
374 /* ask device driver for size of read buffer */
375 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
377 /* see if size of device driver's color buffer (window) has changed */
378 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
379 if (ctx
->Driver
.ResizeBuffers
)
380 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
384 ctx
->NewState
|= _NEW_BUFFERS
; /* to update scissor / window bounds */
389 * XXX THIS IS OBSOLETE
392 _mesa_ResizeBuffersMESA( void )
394 GET_CURRENT_CONTEXT(ctx
);
396 if (ctx
->Extensions
.MESA_resize_buffers
)
397 _mesa_resizebuffers( ctx
);
403 * Examine all the framebuffer's renderbuffers to update the Width/Height
404 * fields of the framebuffer. If we have renderbuffers with different
405 * sizes, set the framebuffer's width and height to the min size.
406 * Note: this is only intended for user-created framebuffers, not
407 * window-system framebuffes.
410 update_framebuffer_size(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
412 GLuint minWidth
= ~0, minHeight
= ~0;
415 /* user-created framebuffers only */
416 assert(_mesa_is_user_fbo(fb
));
418 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
419 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
420 const struct gl_renderbuffer
*rb
= att
->Renderbuffer
;
422 minWidth
= MIN2(minWidth
, rb
->Width
);
423 minHeight
= MIN2(minHeight
, rb
->Height
);
427 if (minWidth
!= ~0) {
428 fb
->Width
= minWidth
;
429 fb
->Height
= minHeight
;
439 * Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
440 * These values are computed from the buffer's width and height and
441 * the scissor box, if it's enabled.
442 * \param ctx the GL context.
445 _mesa_update_draw_buffer_bounds(struct gl_context
*ctx
)
447 struct gl_framebuffer
*buffer
= ctx
->DrawBuffer
;
452 if (_mesa_is_user_fbo(buffer
)) {
453 /* user-created framebuffer size depends on the renderbuffers */
454 update_framebuffer_size(ctx
, buffer
);
459 buffer
->_Xmax
= buffer
->Width
;
460 buffer
->_Ymax
= buffer
->Height
;
462 if (ctx
->Scissor
.Enabled
) {
463 if (ctx
->Scissor
.X
> buffer
->_Xmin
) {
464 buffer
->_Xmin
= ctx
->Scissor
.X
;
466 if (ctx
->Scissor
.Y
> buffer
->_Ymin
) {
467 buffer
->_Ymin
= ctx
->Scissor
.Y
;
469 if (ctx
->Scissor
.X
+ ctx
->Scissor
.Width
< buffer
->_Xmax
) {
470 buffer
->_Xmax
= ctx
->Scissor
.X
+ ctx
->Scissor
.Width
;
472 if (ctx
->Scissor
.Y
+ ctx
->Scissor
.Height
< buffer
->_Ymax
) {
473 buffer
->_Ymax
= ctx
->Scissor
.Y
+ ctx
->Scissor
.Height
;
475 /* finally, check for empty region */
476 if (buffer
->_Xmin
> buffer
->_Xmax
) {
477 buffer
->_Xmin
= buffer
->_Xmax
;
479 if (buffer
->_Ymin
> buffer
->_Ymax
) {
480 buffer
->_Ymin
= buffer
->_Ymax
;
484 ASSERT(buffer
->_Xmin
<= buffer
->_Xmax
);
485 ASSERT(buffer
->_Ymin
<= buffer
->_Ymax
);
490 * The glGet queries of the framebuffer red/green/blue size, stencil size,
491 * etc. are satisfied by the fields of ctx->DrawBuffer->Visual. These can
492 * change depending on the renderbuffer bindings. This function updates
493 * the given framebuffer's Visual from the current renderbuffer bindings.
495 * This may apply to user-created framebuffers or window system framebuffers.
497 * Also note: ctx->DrawBuffer->Visual.depthBits might not equal
498 * ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer.DepthBits.
499 * The former one is used to convert floating point depth values into
503 _mesa_update_framebuffer_visual(struct gl_context
*ctx
,
504 struct gl_framebuffer
*fb
)
508 memset(&fb
->Visual
, 0, sizeof(fb
->Visual
));
509 fb
->Visual
.rgbMode
= GL_TRUE
; /* assume this */
511 #if 0 /* this _might_ be needed */
512 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
513 /* leave visual fields zero'd */
518 /* find first RGB renderbuffer */
519 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
520 if (fb
->Attachment
[i
].Renderbuffer
) {
521 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
522 const GLenum baseFormat
= _mesa_get_format_base_format(rb
->Format
);
523 const gl_format fmt
= rb
->Format
;
525 /* Grab samples and sampleBuffers from any attachment point (assuming
526 * the framebuffer is complete, we'll get the same answer from all
529 fb
->Visual
.samples
= rb
->NumSamples
;
530 fb
->Visual
.sampleBuffers
= rb
->NumSamples
> 0 ? 1 : 0;
532 if (_mesa_is_legal_color_format(ctx
, baseFormat
)) {
533 fb
->Visual
.redBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
534 fb
->Visual
.greenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
535 fb
->Visual
.blueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
536 fb
->Visual
.alphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
537 fb
->Visual
.rgbBits
= fb
->Visual
.redBits
538 + fb
->Visual
.greenBits
+ fb
->Visual
.blueBits
;
539 if (_mesa_get_format_color_encoding(fmt
) == GL_SRGB
)
540 fb
->Visual
.sRGBCapable
= ctx
->Extensions
.EXT_framebuffer_sRGB
;
546 fb
->Visual
.floatMode
= GL_FALSE
;
547 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
548 if (fb
->Attachment
[i
].Renderbuffer
) {
549 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
550 const gl_format fmt
= rb
->Format
;
552 if (_mesa_get_format_datatype(fmt
) == GL_FLOAT
) {
553 fb
->Visual
.floatMode
= GL_TRUE
;
559 if (fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
) {
560 const struct gl_renderbuffer
*rb
=
561 fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
562 const gl_format fmt
= rb
->Format
;
563 fb
->Visual
.haveDepthBuffer
= GL_TRUE
;
564 fb
->Visual
.depthBits
= _mesa_get_format_bits(fmt
, GL_DEPTH_BITS
);
567 if (fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
) {
568 const struct gl_renderbuffer
*rb
=
569 fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
570 const gl_format fmt
= rb
->Format
;
571 fb
->Visual
.haveStencilBuffer
= GL_TRUE
;
572 fb
->Visual
.stencilBits
= _mesa_get_format_bits(fmt
, GL_STENCIL_BITS
);
575 if (fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
) {
576 const struct gl_renderbuffer
*rb
=
577 fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
;
578 const gl_format fmt
= rb
->Format
;
579 fb
->Visual
.haveAccumBuffer
= GL_TRUE
;
580 fb
->Visual
.accumRedBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
581 fb
->Visual
.accumGreenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
582 fb
->Visual
.accumBlueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
583 fb
->Visual
.accumAlphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
586 compute_depth_max(fb
);
591 * Example DrawBuffers scenarios:
593 * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to
594 * "gl_FragColor" or program writes to the "result.color" register:
596 * fragment color output renderbuffer
597 * --------------------- ---------------
598 * color[0] Front, Back
601 * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to
602 * gl_FragData[i] or program writes to result.color[i] registers:
604 * fragment color output renderbuffer
605 * --------------------- ---------------
611 * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to
612 * gl_FragColor, or fixed function:
614 * fragment color output renderbuffer
615 * --------------------- ---------------
616 * color[0] Front, Aux0, Aux1
619 * In either case, the list of renderbuffers is stored in the
620 * framebuffer->_ColorDrawBuffers[] array and
621 * framebuffer->_NumColorDrawBuffers indicates the number of buffers.
622 * The renderer (like swrast) has to look at the current fragment shader
623 * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine
624 * how to map color outputs to renderbuffers.
626 * Note that these two calls are equivalent (for fixed function fragment
628 * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer)
629 * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]);
636 * Update the (derived) list of color drawing renderbuffer pointers.
637 * Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
641 update_color_draw_buffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
645 /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */
646 fb
->_ColorDrawBuffers
[0] = NULL
;
648 for (output
= 0; output
< fb
->_NumColorDrawBuffers
; output
++) {
649 GLint buf
= fb
->_ColorDrawBufferIndexes
[output
];
651 fb
->_ColorDrawBuffers
[output
] = fb
->Attachment
[buf
].Renderbuffer
;
654 fb
->_ColorDrawBuffers
[output
] = NULL
;
661 * Update the (derived) color read renderbuffer pointer.
662 * Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
665 update_color_read_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
668 if (fb
->_ColorReadBufferIndex
== -1 ||
672 fb
->_ColorReadBuffer
= NULL
; /* legal! */
675 ASSERT(fb
->_ColorReadBufferIndex
>= 0);
676 ASSERT(fb
->_ColorReadBufferIndex
< BUFFER_COUNT
);
678 = fb
->Attachment
[fb
->_ColorReadBufferIndex
].Renderbuffer
;
684 * Update a gl_framebuffer's derived state.
686 * Specifically, update these framebuffer fields:
688 * _NumColorDrawBuffers
691 * If the framebuffer is user-created, make sure it's complete.
693 * The following functions (at least) can effect framebuffer state:
694 * glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
695 * glRenderbufferStorageEXT.
698 update_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
700 if (_mesa_is_winsys_fbo(fb
)) {
701 /* This is a window-system framebuffer */
702 /* Need to update the FB's GL_DRAW_BUFFER state to match the
703 * context state (GL_READ_BUFFER too).
705 if (fb
->ColorDrawBuffer
[0] != ctx
->Color
.DrawBuffer
[0]) {
706 _mesa_drawbuffers(ctx
, ctx
->Const
.MaxDrawBuffers
,
707 ctx
->Color
.DrawBuffer
, NULL
);
711 /* This is a user-created framebuffer.
712 * Completeness only matters for user-created framebuffers.
714 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE
) {
715 _mesa_test_framebuffer_completeness(ctx
, fb
);
719 /* Strictly speaking, we don't need to update the draw-state
720 * if this FB is bound as ctx->ReadBuffer (and conversely, the
721 * read-state if this FB is bound as ctx->DrawBuffer), but no
724 update_color_draw_buffers(ctx
, fb
);
725 update_color_read_buffer(ctx
, fb
);
727 compute_depth_max(fb
);
732 * Update state related to the current draw/read framebuffers.
735 _mesa_update_framebuffer(struct gl_context
*ctx
)
737 struct gl_framebuffer
*drawFb
;
738 struct gl_framebuffer
*readFb
;
741 drawFb
= ctx
->DrawBuffer
;
742 readFb
= ctx
->ReadBuffer
;
744 update_framebuffer(ctx
, drawFb
);
745 if (readFb
!= drawFb
)
746 update_framebuffer(ctx
, readFb
);
748 _mesa_update_clamp_vertex_color(ctx
);
749 _mesa_update_clamp_fragment_color(ctx
);
754 * Check if the renderbuffer for a read/draw operation exists.
755 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
756 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
757 * \param reading if TRUE, we're going to read from the buffer,
758 if FALSE, we're going to write to the buffer.
759 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
762 renderbuffer_exists(struct gl_context
*ctx
,
763 struct gl_framebuffer
*fb
,
767 const struct gl_renderbuffer_attachment
*att
= fb
->Attachment
;
769 /* If we don't know the framebuffer status, update it now */
770 if (fb
->_Status
== 0) {
771 _mesa_test_framebuffer_completeness(ctx
, fb
);
774 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
785 case GL_LUMINANCE_ALPHA
:
793 case GL_RED_INTEGER_EXT
:
795 case GL_GREEN_INTEGER_EXT
:
796 case GL_BLUE_INTEGER_EXT
:
797 case GL_ALPHA_INTEGER_EXT
:
798 case GL_RGB_INTEGER_EXT
:
799 case GL_RGBA_INTEGER_EXT
:
800 case GL_BGR_INTEGER_EXT
:
801 case GL_BGRA_INTEGER_EXT
:
802 case GL_LUMINANCE_INTEGER_EXT
:
803 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
805 /* about to read from a color buffer */
806 const struct gl_renderbuffer
*readBuf
= fb
->_ColorReadBuffer
;
810 ASSERT(_mesa_get_format_bits(readBuf
->Format
, GL_RED_BITS
) > 0 ||
811 _mesa_get_format_bits(readBuf
->Format
, GL_ALPHA_BITS
) > 0 ||
812 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_LUMINANCE_SIZE
) > 0 ||
813 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_INTENSITY_SIZE
) > 0 ||
814 _mesa_get_format_bits(readBuf
->Format
, GL_INDEX_BITS
) > 0);
817 /* about to draw to zero or more color buffers (none is OK) */
822 case GL_DEPTH_COMPONENT
:
823 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
) {
828 case GL_STENCIL_INDEX
:
829 if (att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
833 case GL_DEPTH_STENCIL_EXT
:
834 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
||
835 att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
841 "Unexpected format 0x%x in renderbuffer_exists",
852 * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
853 * glCopyTex[Sub]Image, etc) exists.
854 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
855 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
856 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
859 _mesa_source_buffer_exists(struct gl_context
*ctx
, GLenum format
)
861 return renderbuffer_exists(ctx
, ctx
->ReadBuffer
, format
, GL_TRUE
);
866 * As above, but for drawing operations.
869 _mesa_dest_buffer_exists(struct gl_context
*ctx
, GLenum format
)
871 return renderbuffer_exists(ctx
, ctx
->DrawBuffer
, format
, GL_FALSE
);
876 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES query.
879 _mesa_get_color_read_format(struct gl_context
*ctx
)
881 if (!ctx
->ReadBuffer
|| !ctx
->ReadBuffer
->_ColorReadBuffer
) {
882 /* The spec is unclear how to handle this case, but NVIDIA's
883 * driver generates GL_INVALID_OPERATION.
885 _mesa_error(ctx
, GL_INVALID_OPERATION
,
886 "glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT: "
887 "no GL_READ_BUFFER)");
891 const GLenum format
= ctx
->ReadBuffer
->_ColorReadBuffer
->Format
;
892 const GLenum data_type
= _mesa_get_format_datatype(format
);
894 if (format
== MESA_FORMAT_ARGB8888
)
896 else if (format
== MESA_FORMAT_RGB565
)
900 case GL_UNSIGNED_INT
:
902 return GL_RGBA_INTEGER
;
911 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES query.
914 _mesa_get_color_read_type(struct gl_context
*ctx
)
916 if (!ctx
->ReadBuffer
|| !ctx
->ReadBuffer
->_ColorReadBuffer
) {
917 /* The spec is unclear how to handle this case, but NVIDIA's
918 * driver generates GL_INVALID_OPERATION.
920 _mesa_error(ctx
, GL_INVALID_OPERATION
,
921 "glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE: "
922 "no GL_READ_BUFFER)");
926 const GLenum format
= ctx
->ReadBuffer
->_ColorReadBuffer
->Format
;
927 const GLenum data_type
= _mesa_get_format_datatype(format
);
929 if (format
== MESA_FORMAT_RGB565
)
930 return GL_UNSIGNED_SHORT_5_6_5_REV
;
933 case GL_SIGNED_NORMALIZED
:
935 case GL_UNSIGNED_INT
:
939 case GL_UNSIGNED_NORMALIZED
:
941 return GL_UNSIGNED_BYTE
;
948 * Returns the read renderbuffer for the specified format.
950 struct gl_renderbuffer
*
951 _mesa_get_read_renderbuffer_for_format(const struct gl_context
*ctx
,
954 const struct gl_framebuffer
*rfb
= ctx
->ReadBuffer
;
956 if (_mesa_is_color_format(format
)) {
957 return rfb
->Attachment
[rfb
->_ColorReadBufferIndex
].Renderbuffer
;
958 } else if (_mesa_is_depth_format(format
) ||
959 _mesa_is_depthstencil_format(format
)) {
960 return rfb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
962 return rfb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
968 * Print framebuffer info to stderr, for debugging.
971 _mesa_print_framebuffer(const struct gl_framebuffer
*fb
)
975 fprintf(stderr
, "Mesa Framebuffer %u at %p\n", fb
->Name
, (void *) fb
);
976 fprintf(stderr
, " Size: %u x %u Status: %s\n", fb
->Width
, fb
->Height
,
977 _mesa_lookup_enum_by_nr(fb
->_Status
));
978 fprintf(stderr
, " Attachments:\n");
980 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
981 const struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
982 if (att
->Type
== GL_TEXTURE
) {
983 const struct gl_texture_image
*texImage
= att
->Renderbuffer
->TexImage
;
985 " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n",
986 i
, att
->Texture
->Name
, att
->TextureLevel
, att
->CubeMapFace
,
987 att
->Zoffset
, att
->Complete
);
988 fprintf(stderr
, " Size: %u x %u x %u Format %s\n",
989 texImage
->Width
, texImage
->Height
, texImage
->Depth
,
990 _mesa_get_format_name(texImage
->TexFormat
));
992 else if (att
->Type
== GL_RENDERBUFFER
) {
993 fprintf(stderr
, " %2d: Renderbuffer %u, complete %d\n",
994 i
, att
->Renderbuffer
->Name
, att
->Complete
);
995 fprintf(stderr
, " Size: %u x %u Format %s\n",
996 att
->Renderbuffer
->Width
, att
->Renderbuffer
->Height
,
997 _mesa_get_format_name(att
->Renderbuffer
->Format
));
1000 fprintf(stderr
, " %2d: none\n", i
);