2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2008 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.
27 * Functions for allocating/managing framebuffers and renderbuffers.
28 * Also, routines for reading/writing renderbuffer data as ubytes,
29 * ushorts, uints, etc.
43 #include "framebuffer.h"
44 #include "renderbuffer.h"
46 #include "glformats.h"
51 * Compute/set the _DepthMax field for the given framebuffer.
52 * This value depends on the Z buffer resolution.
55 compute_depth_max(struct gl_framebuffer
*fb
)
57 if (fb
->Visual
.depthBits
== 0) {
58 /* Special case. Even if we don't have a depth buffer we need
59 * good values for DepthMax for Z vertex transformation purposes
60 * and for per-fragment fog computation.
62 fb
->_DepthMax
= (1 << 16) - 1;
64 else if (fb
->Visual
.depthBits
< 32) {
65 fb
->_DepthMax
= (1 << fb
->Visual
.depthBits
) - 1;
68 /* Special case since shift values greater than or equal to the
69 * number of bits in the left hand expression's type are undefined.
71 fb
->_DepthMax
= 0xffffffff;
73 fb
->_DepthMaxF
= (GLfloat
) fb
->_DepthMax
;
75 /* Minimum resolvable depth value, for polygon offset */
76 fb
->_MRD
= (GLfloat
)1.0 / fb
->_DepthMaxF
;
80 * Create and initialize a gl_framebuffer object.
81 * This is intended for creating _window_system_ framebuffers, not generic
82 * framebuffer objects ala GL_EXT_framebuffer_object.
84 * \sa _mesa_new_framebuffer
86 struct gl_framebuffer
*
87 _mesa_create_framebuffer(const struct gl_config
*visual
)
89 struct gl_framebuffer
*fb
= CALLOC_STRUCT(gl_framebuffer
);
92 _mesa_initialize_window_framebuffer(fb
, visual
);
99 * Allocate a new gl_framebuffer object.
100 * This is the default function for ctx->Driver.NewFramebuffer().
101 * This is for allocating user-created framebuffers, not window-system
103 * \sa _mesa_create_framebuffer
105 struct gl_framebuffer
*
106 _mesa_new_framebuffer(struct gl_context
*ctx
, GLuint name
)
108 struct gl_framebuffer
*fb
;
111 fb
= CALLOC_STRUCT(gl_framebuffer
);
113 _mesa_initialize_user_framebuffer(fb
, name
);
120 * Initialize a gl_framebuffer object. Typically used to initialize
121 * window system-created framebuffers, not user-created framebuffers.
122 * \sa _mesa_initialize_user_framebuffer
125 _mesa_initialize_window_framebuffer(struct gl_framebuffer
*fb
,
126 const struct gl_config
*visual
)
131 memset(fb
, 0, sizeof(struct gl_framebuffer
));
133 _glthread_INIT_MUTEX(fb
->Mutex
);
137 /* save the visual */
138 fb
->Visual
= *visual
;
140 /* Init read/draw renderbuffer state */
141 if (visual
->doubleBufferMode
) {
142 fb
->_NumColorDrawBuffers
= 1;
143 fb
->ColorDrawBuffer
[0] = GL_BACK
;
144 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_BACK_LEFT
;
145 fb
->ColorReadBuffer
= GL_BACK
;
146 fb
->_ColorReadBufferIndex
= BUFFER_BACK_LEFT
;
149 fb
->_NumColorDrawBuffers
= 1;
150 fb
->ColorDrawBuffer
[0] = GL_FRONT
;
151 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_FRONT_LEFT
;
152 fb
->ColorReadBuffer
= GL_FRONT
;
153 fb
->_ColorReadBufferIndex
= BUFFER_FRONT_LEFT
;
156 fb
->Delete
= _mesa_destroy_framebuffer
;
157 fb
->_Status
= GL_FRAMEBUFFER_COMPLETE_EXT
;
158 fb
->_AllColorBuffersFixedPoint
= !visual
->floatMode
;
159 fb
->_HasSNormOrFloatColorBuffer
= visual
->floatMode
;
161 compute_depth_max(fb
);
166 * Initialize a user-created gl_framebuffer object.
167 * \sa _mesa_initialize_window_framebuffer
170 _mesa_initialize_user_framebuffer(struct gl_framebuffer
*fb
, GLuint name
)
175 memset(fb
, 0, sizeof(struct gl_framebuffer
));
179 fb
->_NumColorDrawBuffers
= 1;
180 fb
->ColorDrawBuffer
[0] = GL_COLOR_ATTACHMENT0_EXT
;
181 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_COLOR0
;
182 fb
->ColorReadBuffer
= GL_COLOR_ATTACHMENT0_EXT
;
183 fb
->_ColorReadBufferIndex
= BUFFER_COLOR0
;
184 fb
->Delete
= _mesa_destroy_framebuffer
;
185 _glthread_INIT_MUTEX(fb
->Mutex
);
190 * Deallocate buffer and everything attached to it.
191 * Typically called via the gl_framebuffer->Delete() method.
194 _mesa_destroy_framebuffer(struct gl_framebuffer
*fb
)
197 _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
;
324 * Examine all the framebuffer's renderbuffers to update the Width/Height
325 * fields of the framebuffer. If we have renderbuffers with different
326 * sizes, set the framebuffer's width and height to the min size.
327 * Note: this is only intended for user-created framebuffers, not
328 * window-system framebuffes.
331 update_framebuffer_size(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
333 GLuint minWidth
= ~0, minHeight
= ~0;
336 /* user-created framebuffers only */
337 assert(_mesa_is_user_fbo(fb
));
339 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
340 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
341 const struct gl_renderbuffer
*rb
= att
->Renderbuffer
;
343 minWidth
= MIN2(minWidth
, rb
->Width
);
344 minHeight
= MIN2(minHeight
, rb
->Height
);
348 if (minWidth
!= ~0) {
349 fb
->Width
= minWidth
;
350 fb
->Height
= minHeight
;
360 * Calculate the inclusive bounding box for the scissor of a specific viewport
362 * \param ctx GL context.
363 * \param buffer Framebuffer to be checked against
364 * \param idx Index of the desired viewport
365 * \param bbox Bounding box for the scissored viewport. Stored as xmin,
368 * \warning This function assumes that the framebuffer dimensions are up to
369 * date (e.g., update_framebuffer_size has been recently called on \c buffer).
371 * \sa _mesa_clip_to_region
374 _mesa_scissor_bounding_box(const struct gl_context
*ctx
,
375 const struct gl_framebuffer
*buffer
,
376 unsigned idx
, int *bbox
)
380 bbox
[1] = buffer
->Width
;
381 bbox
[3] = buffer
->Height
;
383 if (ctx
->Scissor
.EnableFlags
& (1u << idx
)) {
384 if (ctx
->Scissor
.ScissorArray
[idx
].X
> bbox
[0]) {
385 bbox
[0] = ctx
->Scissor
.ScissorArray
[idx
].X
;
387 if (ctx
->Scissor
.ScissorArray
[idx
].Y
> bbox
[2]) {
388 bbox
[2] = ctx
->Scissor
.ScissorArray
[idx
].Y
;
390 if (ctx
->Scissor
.ScissorArray
[idx
].X
+ ctx
->Scissor
.ScissorArray
[idx
].Width
< bbox
[1]) {
391 bbox
[1] = ctx
->Scissor
.ScissorArray
[idx
].X
+ ctx
->Scissor
.ScissorArray
[idx
].Width
;
393 if (ctx
->Scissor
.ScissorArray
[idx
].Y
+ ctx
->Scissor
.ScissorArray
[idx
].Height
< bbox
[3]) {
394 bbox
[3] = ctx
->Scissor
.ScissorArray
[idx
].Y
+ ctx
->Scissor
.ScissorArray
[idx
].Height
;
396 /* finally, check for empty region */
397 if (bbox
[0] > bbox
[1]) {
400 if (bbox
[2] > bbox
[3]) {
405 ASSERT(bbox
[0] <= bbox
[1]);
406 ASSERT(bbox
[2] <= bbox
[3]);
410 * Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
411 * These values are computed from the buffer's width and height and
412 * the scissor box, if it's enabled.
413 * \param ctx the GL context.
416 _mesa_update_draw_buffer_bounds(struct gl_context
*ctx
)
418 struct gl_framebuffer
*buffer
= ctx
->DrawBuffer
;
424 if (_mesa_is_user_fbo(buffer
)) {
425 /* user-created framebuffer size depends on the renderbuffers */
426 update_framebuffer_size(ctx
, buffer
);
429 /* Default to the first scissor as that's always valid */
430 _mesa_scissor_bounding_box(ctx
, buffer
, 0, bbox
);
431 buffer
->_Xmin
= bbox
[0];
432 buffer
->_Ymin
= bbox
[2];
433 buffer
->_Xmax
= bbox
[1];
434 buffer
->_Ymax
= bbox
[3];
439 * The glGet queries of the framebuffer red/green/blue size, stencil size,
440 * etc. are satisfied by the fields of ctx->DrawBuffer->Visual. These can
441 * change depending on the renderbuffer bindings. This function updates
442 * the given framebuffer's Visual from the current renderbuffer bindings.
444 * This may apply to user-created framebuffers or window system framebuffers.
446 * Also note: ctx->DrawBuffer->Visual.depthBits might not equal
447 * ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer.DepthBits.
448 * The former one is used to convert floating point depth values into
452 _mesa_update_framebuffer_visual(struct gl_context
*ctx
,
453 struct gl_framebuffer
*fb
)
457 memset(&fb
->Visual
, 0, sizeof(fb
->Visual
));
458 fb
->Visual
.rgbMode
= GL_TRUE
; /* assume this */
460 #if 0 /* this _might_ be needed */
461 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
462 /* leave visual fields zero'd */
467 /* find first RGB renderbuffer */
468 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
469 if (fb
->Attachment
[i
].Renderbuffer
) {
470 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
471 const GLenum baseFormat
= _mesa_get_format_base_format(rb
->Format
);
472 const mesa_format fmt
= rb
->Format
;
474 /* Grab samples and sampleBuffers from any attachment point (assuming
475 * the framebuffer is complete, we'll get the same answer from all
478 fb
->Visual
.samples
= rb
->NumSamples
;
479 fb
->Visual
.sampleBuffers
= rb
->NumSamples
> 0 ? 1 : 0;
481 if (_mesa_is_legal_color_format(ctx
, baseFormat
)) {
482 fb
->Visual
.redBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
483 fb
->Visual
.greenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
484 fb
->Visual
.blueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
485 fb
->Visual
.alphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
486 fb
->Visual
.rgbBits
= fb
->Visual
.redBits
487 + fb
->Visual
.greenBits
+ fb
->Visual
.blueBits
;
488 if (_mesa_get_format_color_encoding(fmt
) == GL_SRGB
)
489 fb
->Visual
.sRGBCapable
= ctx
->Extensions
.EXT_framebuffer_sRGB
;
495 fb
->Visual
.floatMode
= GL_FALSE
;
496 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
497 if (fb
->Attachment
[i
].Renderbuffer
) {
498 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
499 const mesa_format fmt
= rb
->Format
;
501 if (_mesa_get_format_datatype(fmt
) == GL_FLOAT
) {
502 fb
->Visual
.floatMode
= GL_TRUE
;
508 if (fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
) {
509 const struct gl_renderbuffer
*rb
=
510 fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
511 const mesa_format fmt
= rb
->Format
;
512 fb
->Visual
.haveDepthBuffer
= GL_TRUE
;
513 fb
->Visual
.depthBits
= _mesa_get_format_bits(fmt
, GL_DEPTH_BITS
);
516 if (fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
) {
517 const struct gl_renderbuffer
*rb
=
518 fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
519 const mesa_format fmt
= rb
->Format
;
520 fb
->Visual
.haveStencilBuffer
= GL_TRUE
;
521 fb
->Visual
.stencilBits
= _mesa_get_format_bits(fmt
, GL_STENCIL_BITS
);
524 if (fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
) {
525 const struct gl_renderbuffer
*rb
=
526 fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
;
527 const mesa_format fmt
= rb
->Format
;
528 fb
->Visual
.haveAccumBuffer
= GL_TRUE
;
529 fb
->Visual
.accumRedBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
530 fb
->Visual
.accumGreenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
531 fb
->Visual
.accumBlueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
532 fb
->Visual
.accumAlphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
535 compute_depth_max(fb
);
540 * Example DrawBuffers scenarios:
542 * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to
543 * "gl_FragColor" or program writes to the "result.color" register:
545 * fragment color output renderbuffer
546 * --------------------- ---------------
547 * color[0] Front, Back
550 * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to
551 * gl_FragData[i] or program writes to result.color[i] registers:
553 * fragment color output renderbuffer
554 * --------------------- ---------------
560 * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to
561 * gl_FragColor, or fixed function:
563 * fragment color output renderbuffer
564 * --------------------- ---------------
565 * color[0] Front, Aux0, Aux1
568 * In either case, the list of renderbuffers is stored in the
569 * framebuffer->_ColorDrawBuffers[] array and
570 * framebuffer->_NumColorDrawBuffers indicates the number of buffers.
571 * The renderer (like swrast) has to look at the current fragment shader
572 * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine
573 * how to map color outputs to renderbuffers.
575 * Note that these two calls are equivalent (for fixed function fragment
577 * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer)
578 * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]);
585 * Update the (derived) list of color drawing renderbuffer pointers.
586 * Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
590 update_color_draw_buffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
594 /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */
595 fb
->_ColorDrawBuffers
[0] = NULL
;
597 for (output
= 0; output
< fb
->_NumColorDrawBuffers
; output
++) {
598 GLint buf
= fb
->_ColorDrawBufferIndexes
[output
];
600 fb
->_ColorDrawBuffers
[output
] = fb
->Attachment
[buf
].Renderbuffer
;
603 fb
->_ColorDrawBuffers
[output
] = NULL
;
610 * Update the (derived) color read renderbuffer pointer.
611 * Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
614 update_color_read_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
617 if (fb
->_ColorReadBufferIndex
== -1 ||
621 fb
->_ColorReadBuffer
= NULL
; /* legal! */
624 ASSERT(fb
->_ColorReadBufferIndex
>= 0);
625 ASSERT(fb
->_ColorReadBufferIndex
< BUFFER_COUNT
);
627 = fb
->Attachment
[fb
->_ColorReadBufferIndex
].Renderbuffer
;
633 * Update a gl_framebuffer's derived state.
635 * Specifically, update these framebuffer fields:
637 * _NumColorDrawBuffers
640 * If the framebuffer is user-created, make sure it's complete.
642 * The following functions (at least) can effect framebuffer state:
643 * glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
644 * glRenderbufferStorageEXT.
647 update_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
649 if (_mesa_is_winsys_fbo(fb
)) {
650 /* This is a window-system framebuffer */
651 /* Need to update the FB's GL_DRAW_BUFFER state to match the
652 * context state (GL_READ_BUFFER too).
654 if (fb
->ColorDrawBuffer
[0] != ctx
->Color
.DrawBuffer
[0]) {
655 _mesa_drawbuffers(ctx
, ctx
->Const
.MaxDrawBuffers
,
656 ctx
->Color
.DrawBuffer
, NULL
);
660 /* This is a user-created framebuffer.
661 * Completeness only matters for user-created framebuffers.
663 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE
) {
664 _mesa_test_framebuffer_completeness(ctx
, fb
);
668 /* Strictly speaking, we don't need to update the draw-state
669 * if this FB is bound as ctx->ReadBuffer (and conversely, the
670 * read-state if this FB is bound as ctx->DrawBuffer), but no
673 update_color_draw_buffers(ctx
, fb
);
674 update_color_read_buffer(ctx
, fb
);
676 compute_depth_max(fb
);
681 * Update state related to the current draw/read framebuffers.
684 _mesa_update_framebuffer(struct gl_context
*ctx
)
686 struct gl_framebuffer
*drawFb
;
687 struct gl_framebuffer
*readFb
;
690 drawFb
= ctx
->DrawBuffer
;
691 readFb
= ctx
->ReadBuffer
;
693 update_framebuffer(ctx
, drawFb
);
694 if (readFb
!= drawFb
)
695 update_framebuffer(ctx
, readFb
);
697 _mesa_update_clamp_vertex_color(ctx
);
698 _mesa_update_clamp_fragment_color(ctx
);
703 * Check if the renderbuffer for a read/draw operation exists.
704 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
705 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
706 * \param reading if TRUE, we're going to read from the buffer,
707 if FALSE, we're going to write to the buffer.
708 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
711 renderbuffer_exists(struct gl_context
*ctx
,
712 struct gl_framebuffer
*fb
,
716 const struct gl_renderbuffer_attachment
*att
= fb
->Attachment
;
718 /* If we don't know the framebuffer status, update it now */
719 if (fb
->_Status
== 0) {
720 _mesa_test_framebuffer_completeness(ctx
, fb
);
723 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
734 case GL_LUMINANCE_ALPHA
:
742 case GL_RED_INTEGER_EXT
:
744 case GL_GREEN_INTEGER_EXT
:
745 case GL_BLUE_INTEGER_EXT
:
746 case GL_ALPHA_INTEGER_EXT
:
747 case GL_RGB_INTEGER_EXT
:
748 case GL_RGBA_INTEGER_EXT
:
749 case GL_BGR_INTEGER_EXT
:
750 case GL_BGRA_INTEGER_EXT
:
751 case GL_LUMINANCE_INTEGER_EXT
:
752 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
754 /* about to read from a color buffer */
755 const struct gl_renderbuffer
*readBuf
= fb
->_ColorReadBuffer
;
759 ASSERT(_mesa_get_format_bits(readBuf
->Format
, GL_RED_BITS
) > 0 ||
760 _mesa_get_format_bits(readBuf
->Format
, GL_ALPHA_BITS
) > 0 ||
761 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_LUMINANCE_SIZE
) > 0 ||
762 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_INTENSITY_SIZE
) > 0 ||
763 _mesa_get_format_bits(readBuf
->Format
, GL_INDEX_BITS
) > 0);
766 /* about to draw to zero or more color buffers (none is OK) */
771 case GL_DEPTH_COMPONENT
:
772 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
) {
777 case GL_STENCIL_INDEX
:
778 if (att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
782 case GL_DEPTH_STENCIL_EXT
:
783 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
||
784 att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
790 "Unexpected format 0x%x in renderbuffer_exists",
801 * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
802 * glCopyTex[Sub]Image, etc) exists.
803 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
804 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
805 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
808 _mesa_source_buffer_exists(struct gl_context
*ctx
, GLenum format
)
810 return renderbuffer_exists(ctx
, ctx
->ReadBuffer
, format
, GL_TRUE
);
815 * As above, but for drawing operations.
818 _mesa_dest_buffer_exists(struct gl_context
*ctx
, GLenum format
)
820 return renderbuffer_exists(ctx
, ctx
->DrawBuffer
, format
, GL_FALSE
);
825 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES query.
828 _mesa_get_color_read_format(struct gl_context
*ctx
)
830 if (!ctx
->ReadBuffer
|| !ctx
->ReadBuffer
->_ColorReadBuffer
) {
831 /* The spec is unclear how to handle this case, but NVIDIA's
832 * driver generates GL_INVALID_OPERATION.
834 _mesa_error(ctx
, GL_INVALID_OPERATION
,
835 "glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT: "
836 "no GL_READ_BUFFER)");
840 const GLenum format
= ctx
->ReadBuffer
->_ColorReadBuffer
->Format
;
841 const GLenum data_type
= _mesa_get_format_datatype(format
);
843 if (format
== MESA_FORMAT_B8G8R8A8_UNORM
)
845 else if (format
== MESA_FORMAT_RGB565
)
849 case GL_UNSIGNED_INT
:
851 return GL_RGBA_INTEGER
;
860 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES query.
863 _mesa_get_color_read_type(struct gl_context
*ctx
)
865 if (!ctx
->ReadBuffer
|| !ctx
->ReadBuffer
->_ColorReadBuffer
) {
866 /* The spec is unclear how to handle this case, but NVIDIA's
867 * driver generates GL_INVALID_OPERATION.
869 _mesa_error(ctx
, GL_INVALID_OPERATION
,
870 "glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE: "
871 "no GL_READ_BUFFER)");
875 const GLenum format
= ctx
->ReadBuffer
->_ColorReadBuffer
->Format
;
876 const GLenum data_type
= _mesa_get_format_datatype(format
);
878 if (format
== MESA_FORMAT_RGB565
)
879 return GL_UNSIGNED_SHORT_5_6_5_REV
;
882 case GL_SIGNED_NORMALIZED
:
884 case GL_UNSIGNED_INT
:
888 case GL_UNSIGNED_NORMALIZED
:
890 return GL_UNSIGNED_BYTE
;
897 * Returns the read renderbuffer for the specified format.
899 struct gl_renderbuffer
*
900 _mesa_get_read_renderbuffer_for_format(const struct gl_context
*ctx
,
903 const struct gl_framebuffer
*rfb
= ctx
->ReadBuffer
;
905 if (_mesa_is_color_format(format
)) {
906 return rfb
->Attachment
[rfb
->_ColorReadBufferIndex
].Renderbuffer
;
907 } else if (_mesa_is_depth_format(format
) ||
908 _mesa_is_depthstencil_format(format
)) {
909 return rfb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
911 return rfb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
917 * Print framebuffer info to stderr, for debugging.
920 _mesa_print_framebuffer(const struct gl_framebuffer
*fb
)
924 fprintf(stderr
, "Mesa Framebuffer %u at %p\n", fb
->Name
, (void *) fb
);
925 fprintf(stderr
, " Size: %u x %u Status: %s\n", fb
->Width
, fb
->Height
,
926 _mesa_lookup_enum_by_nr(fb
->_Status
));
927 fprintf(stderr
, " Attachments:\n");
929 for (i
= 0; i
< BUFFER_COUNT
; i
++) {
930 const struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
931 if (att
->Type
== GL_TEXTURE
) {
932 const struct gl_texture_image
*texImage
= att
->Renderbuffer
->TexImage
;
934 " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n",
935 i
, att
->Texture
->Name
, att
->TextureLevel
, att
->CubeMapFace
,
936 att
->Zoffset
, att
->Complete
);
937 fprintf(stderr
, " Size: %u x %u x %u Format %s\n",
938 texImage
->Width
, texImage
->Height
, texImage
->Depth
,
939 _mesa_get_format_name(texImage
->TexFormat
));
941 else if (att
->Type
== GL_RENDERBUFFER
) {
942 fprintf(stderr
, " %2d: Renderbuffer %u, complete %d\n",
943 i
, att
->Renderbuffer
->Name
, att
->Complete
);
944 fprintf(stderr
, " Size: %u x %u Format %s\n",
945 att
->Renderbuffer
->Width
, att
->Renderbuffer
->Height
,
946 _mesa_get_format_name(att
->Renderbuffer
->Format
));
949 fprintf(stderr
, " %2d: none\n", i
);