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"
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 simple_mtx_init(&fb
->Mutex
, mtx_plain
);
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
;
161 fb
->_HasAttachments
= true;
163 compute_depth_max(fb
);
168 * Initialize a user-created gl_framebuffer object.
169 * \sa _mesa_initialize_window_framebuffer
172 _mesa_initialize_user_framebuffer(struct gl_framebuffer
*fb
, GLuint name
)
177 memset(fb
, 0, sizeof(struct gl_framebuffer
));
181 fb
->_NumColorDrawBuffers
= 1;
182 fb
->ColorDrawBuffer
[0] = GL_COLOR_ATTACHMENT0_EXT
;
183 fb
->_ColorDrawBufferIndexes
[0] = BUFFER_COLOR0
;
184 fb
->ColorReadBuffer
= GL_COLOR_ATTACHMENT0_EXT
;
185 fb
->_ColorReadBufferIndex
= BUFFER_COLOR0
;
186 fb
->Delete
= _mesa_destroy_framebuffer
;
187 simple_mtx_init(&fb
->Mutex
, mtx_plain
);
192 * Deallocate buffer and everything attached to it.
193 * Typically called via the gl_framebuffer->Delete() method.
196 _mesa_destroy_framebuffer(struct gl_framebuffer
*fb
)
199 _mesa_free_framebuffer_data(fb
);
207 * Free all the data hanging off the given gl_framebuffer, but don't free
208 * the gl_framebuffer object itself.
211 _mesa_free_framebuffer_data(struct gl_framebuffer
*fb
)
214 assert(fb
->RefCount
== 0);
216 simple_mtx_destroy(&fb
->Mutex
);
218 for (unsigned 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 simple_mtx_lock(&oldFb
->Mutex
);
248 assert(oldFb
->RefCount
> 0);
250 deleteFlag
= (oldFb
->RefCount
== 0);
251 simple_mtx_unlock(&oldFb
->Mutex
);
254 oldFb
->Delete(oldFb
);
260 simple_mtx_lock(&fb
->Mutex
);
262 simple_mtx_unlock(&fb
->Mutex
);
269 * Resize the given framebuffer's renderbuffers to the new width and height.
270 * This should only be used for window-system framebuffers, not
271 * user-created renderbuffers (i.e. made with GL_EXT_framebuffer_object).
272 * This will typically be called directly from a device driver.
274 * \note it's possible for ctx to be null since a window can be resized
275 * without a currently bound rendering context.
278 _mesa_resize_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
,
279 GLuint width
, GLuint height
)
281 /* XXX I think we could check if the size is not changing
285 /* Can only resize win-sys framebuffer objects */
286 assert(_mesa_is_winsys_fbo(fb
));
288 for (unsigned i
= 0; i
< BUFFER_COUNT
; i
++) {
289 struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
290 if (att
->Type
== GL_RENDERBUFFER_EXT
&& att
->Renderbuffer
) {
291 struct gl_renderbuffer
*rb
= att
->Renderbuffer
;
292 /* only resize if size is changing */
293 if (rb
->Width
!= width
|| rb
->Height
!= height
) {
294 if (rb
->AllocStorage(ctx
, rb
, rb
->InternalFormat
, width
, height
)) {
295 assert(rb
->Width
== width
);
296 assert(rb
->Height
== height
);
299 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "Resizing framebuffer");
310 /* update scissor / window bounds */
311 _mesa_update_draw_buffer_bounds(ctx
, ctx
->DrawBuffer
);
312 /* Signal new buffer state so that swrast will update its clipping
313 * info (the CLIP_BIT flag).
315 ctx
->NewState
|= _NEW_BUFFERS
;
320 * Given a bounding box, intersect the bounding box with the scissor of
321 * a specified vieport.
323 * \param ctx GL context.
324 * \param idx Index of the desired viewport
325 * \param bbox Bounding box for the scissored viewport. Stored as xmin,
329 _mesa_intersect_scissor_bounding_box(const struct gl_context
*ctx
,
330 unsigned idx
, int *bbox
)
332 if (ctx
->Scissor
.EnableFlags
& (1u << idx
)) {
333 if (ctx
->Scissor
.ScissorArray
[idx
].X
> bbox
[0]) {
334 bbox
[0] = ctx
->Scissor
.ScissorArray
[idx
].X
;
336 if (ctx
->Scissor
.ScissorArray
[idx
].Y
> bbox
[2]) {
337 bbox
[2] = ctx
->Scissor
.ScissorArray
[idx
].Y
;
339 if (ctx
->Scissor
.ScissorArray
[idx
].X
+ ctx
->Scissor
.ScissorArray
[idx
].Width
< bbox
[1]) {
340 bbox
[1] = ctx
->Scissor
.ScissorArray
[idx
].X
+ ctx
->Scissor
.ScissorArray
[idx
].Width
;
342 if (ctx
->Scissor
.ScissorArray
[idx
].Y
+ ctx
->Scissor
.ScissorArray
[idx
].Height
< bbox
[3]) {
343 bbox
[3] = ctx
->Scissor
.ScissorArray
[idx
].Y
+ ctx
->Scissor
.ScissorArray
[idx
].Height
;
345 /* finally, check for empty region */
346 if (bbox
[0] > bbox
[1]) {
349 if (bbox
[2] > bbox
[3]) {
356 * Calculate the inclusive bounding box for the scissor of a specific viewport
358 * \param ctx GL context.
359 * \param buffer Framebuffer to be checked against
360 * \param idx Index of the desired viewport
361 * \param bbox Bounding box for the scissored viewport. Stored as xmin,
364 * \warning This function assumes that the framebuffer dimensions are up to
367 * \sa _mesa_clip_to_region
370 scissor_bounding_box(const struct gl_context
*ctx
,
371 const struct gl_framebuffer
*buffer
,
372 unsigned idx
, int *bbox
)
376 bbox
[1] = buffer
->Width
;
377 bbox
[3] = buffer
->Height
;
379 _mesa_intersect_scissor_bounding_box(ctx
, idx
, bbox
);
381 assert(bbox
[0] <= bbox
[1]);
382 assert(bbox
[2] <= bbox
[3]);
386 * Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
387 * These values are computed from the buffer's width and height and
388 * the scissor box, if it's enabled.
389 * \param ctx the GL context.
392 _mesa_update_draw_buffer_bounds(struct gl_context
*ctx
,
393 struct gl_framebuffer
*buffer
)
400 /* Default to the first scissor as that's always valid */
401 scissor_bounding_box(ctx
, buffer
, 0, bbox
);
402 buffer
->_Xmin
= bbox
[0];
403 buffer
->_Ymin
= bbox
[2];
404 buffer
->_Xmax
= bbox
[1];
405 buffer
->_Ymax
= bbox
[3];
410 * The glGet queries of the framebuffer red/green/blue size, stencil size,
411 * etc. are satisfied by the fields of ctx->DrawBuffer->Visual. These can
412 * change depending on the renderbuffer bindings. This function updates
413 * the given framebuffer's Visual from the current renderbuffer bindings.
415 * This may apply to user-created framebuffers or window system framebuffers.
417 * Also note: ctx->DrawBuffer->Visual.depthBits might not equal
418 * ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer.DepthBits.
419 * The former one is used to convert floating point depth values into
423 _mesa_update_framebuffer_visual(struct gl_context
*ctx
,
424 struct gl_framebuffer
*fb
)
426 memset(&fb
->Visual
, 0, sizeof(fb
->Visual
));
427 fb
->Visual
.rgbMode
= GL_TRUE
; /* assume this */
429 /* find first RGB renderbuffer */
430 for (unsigned i
= 0; i
< BUFFER_COUNT
; i
++) {
431 if (fb
->Attachment
[i
].Renderbuffer
) {
432 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
433 const GLenum baseFormat
= _mesa_get_format_base_format(rb
->Format
);
434 const mesa_format fmt
= rb
->Format
;
436 /* Grab samples and sampleBuffers from any attachment point (assuming
437 * the framebuffer is complete, we'll get the same answer from all
440 fb
->Visual
.samples
= rb
->NumSamples
;
441 fb
->Visual
.sampleBuffers
= rb
->NumSamples
> 0 ? 1 : 0;
443 if (_mesa_is_legal_color_format(ctx
, baseFormat
)) {
444 fb
->Visual
.redBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
445 fb
->Visual
.greenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
446 fb
->Visual
.blueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
447 fb
->Visual
.alphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
448 fb
->Visual
.rgbBits
= fb
->Visual
.redBits
449 + fb
->Visual
.greenBits
+ fb
->Visual
.blueBits
;
450 if (_mesa_get_format_color_encoding(fmt
) == GL_SRGB
)
451 fb
->Visual
.sRGBCapable
= ctx
->Extensions
.EXT_framebuffer_sRGB
;
457 fb
->Visual
.floatMode
= GL_FALSE
;
458 for (unsigned i
= 0; i
< BUFFER_COUNT
; i
++) {
459 if (fb
->Attachment
[i
].Renderbuffer
) {
460 const struct gl_renderbuffer
*rb
= fb
->Attachment
[i
].Renderbuffer
;
461 const mesa_format fmt
= rb
->Format
;
463 if (_mesa_get_format_datatype(fmt
) == GL_FLOAT
) {
464 fb
->Visual
.floatMode
= GL_TRUE
;
470 if (fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
) {
471 const struct gl_renderbuffer
*rb
=
472 fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
473 const mesa_format fmt
= rb
->Format
;
474 fb
->Visual
.haveDepthBuffer
= GL_TRUE
;
475 fb
->Visual
.depthBits
= _mesa_get_format_bits(fmt
, GL_DEPTH_BITS
);
478 if (fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
) {
479 const struct gl_renderbuffer
*rb
=
480 fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
481 const mesa_format fmt
= rb
->Format
;
482 fb
->Visual
.haveStencilBuffer
= GL_TRUE
;
483 fb
->Visual
.stencilBits
= _mesa_get_format_bits(fmt
, GL_STENCIL_BITS
);
486 if (fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
) {
487 const struct gl_renderbuffer
*rb
=
488 fb
->Attachment
[BUFFER_ACCUM
].Renderbuffer
;
489 const mesa_format fmt
= rb
->Format
;
490 fb
->Visual
.haveAccumBuffer
= GL_TRUE
;
491 fb
->Visual
.accumRedBits
= _mesa_get_format_bits(fmt
, GL_RED_BITS
);
492 fb
->Visual
.accumGreenBits
= _mesa_get_format_bits(fmt
, GL_GREEN_BITS
);
493 fb
->Visual
.accumBlueBits
= _mesa_get_format_bits(fmt
, GL_BLUE_BITS
);
494 fb
->Visual
.accumAlphaBits
= _mesa_get_format_bits(fmt
, GL_ALPHA_BITS
);
497 compute_depth_max(fb
);
502 * Example DrawBuffers scenarios:
504 * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to
505 * "gl_FragColor" or program writes to the "result.color" register:
507 * fragment color output renderbuffer
508 * --------------------- ---------------
509 * color[0] Front, Back
512 * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to
513 * gl_FragData[i] or program writes to result.color[i] registers:
515 * fragment color output renderbuffer
516 * --------------------- ---------------
522 * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to
523 * gl_FragColor, or fixed function:
525 * fragment color output renderbuffer
526 * --------------------- ---------------
527 * color[0] Front, Aux0, Aux1
530 * In either case, the list of renderbuffers is stored in the
531 * framebuffer->_ColorDrawBuffers[] array and
532 * framebuffer->_NumColorDrawBuffers indicates the number of buffers.
533 * The renderer (like swrast) has to look at the current fragment shader
534 * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine
535 * how to map color outputs to renderbuffers.
537 * Note that these two calls are equivalent (for fixed function fragment
539 * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer)
540 * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]);
547 * Update the (derived) list of color drawing renderbuffer pointers.
548 * Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
552 update_color_draw_buffers(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
556 /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */
557 fb
->_ColorDrawBuffers
[0] = NULL
;
559 for (output
= 0; output
< fb
->_NumColorDrawBuffers
; output
++) {
560 gl_buffer_index buf
= fb
->_ColorDrawBufferIndexes
[output
];
561 if (buf
!= BUFFER_NONE
) {
562 fb
->_ColorDrawBuffers
[output
] = fb
->Attachment
[buf
].Renderbuffer
;
565 fb
->_ColorDrawBuffers
[output
] = NULL
;
572 * Update the (derived) color read renderbuffer pointer.
573 * Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
576 update_color_read_buffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
579 if (fb
->_ColorReadBufferIndex
== BUFFER_NONE
||
583 fb
->_ColorReadBuffer
= NULL
; /* legal! */
586 assert(fb
->_ColorReadBufferIndex
>= 0);
587 assert(fb
->_ColorReadBufferIndex
< BUFFER_COUNT
);
589 = fb
->Attachment
[fb
->_ColorReadBufferIndex
].Renderbuffer
;
595 * Update a gl_framebuffer's derived state.
597 * Specifically, update these framebuffer fields:
599 * _NumColorDrawBuffers
602 * If the framebuffer is user-created, make sure it's complete.
604 * The following functions (at least) can effect framebuffer state:
605 * glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
606 * glRenderbufferStorageEXT.
609 update_framebuffer(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
611 if (_mesa_is_winsys_fbo(fb
)) {
612 /* This is a window-system framebuffer */
613 /* Need to update the FB's GL_DRAW_BUFFER state to match the
614 * context state (GL_READ_BUFFER too).
616 if (fb
->ColorDrawBuffer
[0] != ctx
->Color
.DrawBuffer
[0]) {
617 _mesa_drawbuffers(ctx
, fb
, ctx
->Const
.MaxDrawBuffers
,
618 ctx
->Color
.DrawBuffer
, NULL
);
621 /* Call device driver function if fb is the bound draw buffer. */
622 if (fb
== ctx
->DrawBuffer
) {
623 if (ctx
->Driver
.DrawBufferAllocate
)
624 ctx
->Driver
.DrawBufferAllocate(ctx
);
628 /* This is a user-created framebuffer.
629 * Completeness only matters for user-created framebuffers.
631 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE
) {
632 _mesa_test_framebuffer_completeness(ctx
, fb
);
636 /* Strictly speaking, we don't need to update the draw-state
637 * if this FB is bound as ctx->ReadBuffer (and conversely, the
638 * read-state if this FB is bound as ctx->DrawBuffer), but no
641 update_color_draw_buffers(ctx
, fb
);
642 update_color_read_buffer(ctx
, fb
);
644 compute_depth_max(fb
);
649 * Update state related to the draw/read framebuffers.
652 _mesa_update_framebuffer(struct gl_context
*ctx
,
653 struct gl_framebuffer
*readFb
,
654 struct gl_framebuffer
*drawFb
)
658 update_framebuffer(ctx
, drawFb
);
659 if (readFb
!= drawFb
)
660 update_framebuffer(ctx
, readFb
);
662 _mesa_update_clamp_vertex_color(ctx
, drawFb
);
663 _mesa_update_clamp_fragment_color(ctx
, drawFb
);
668 * Check if the renderbuffer for a read/draw operation exists.
669 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
670 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
671 * \param reading if TRUE, we're going to read from the buffer,
672 if FALSE, we're going to write to the buffer.
673 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
676 renderbuffer_exists(struct gl_context
*ctx
,
677 struct gl_framebuffer
*fb
,
681 const struct gl_renderbuffer_attachment
*att
= fb
->Attachment
;
683 /* If we don't know the framebuffer status, update it now */
684 if (fb
->_Status
== 0) {
685 _mesa_test_framebuffer_completeness(ctx
, fb
);
688 if (fb
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
699 case GL_LUMINANCE_ALPHA
:
707 case GL_RED_INTEGER_EXT
:
709 case GL_GREEN_INTEGER_EXT
:
710 case GL_BLUE_INTEGER_EXT
:
711 case GL_ALPHA_INTEGER_EXT
:
712 case GL_RGB_INTEGER_EXT
:
713 case GL_RGBA_INTEGER_EXT
:
714 case GL_BGR_INTEGER_EXT
:
715 case GL_BGRA_INTEGER_EXT
:
716 case GL_LUMINANCE_INTEGER_EXT
:
717 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
719 /* about to read from a color buffer */
720 const struct gl_renderbuffer
*readBuf
= fb
->_ColorReadBuffer
;
724 assert(_mesa_get_format_bits(readBuf
->Format
, GL_RED_BITS
) > 0 ||
725 _mesa_get_format_bits(readBuf
->Format
, GL_ALPHA_BITS
) > 0 ||
726 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_LUMINANCE_SIZE
) > 0 ||
727 _mesa_get_format_bits(readBuf
->Format
, GL_TEXTURE_INTENSITY_SIZE
) > 0 ||
728 _mesa_get_format_bits(readBuf
->Format
, GL_INDEX_BITS
) > 0);
731 /* about to draw to zero or more color buffers (none is OK) */
736 case GL_DEPTH_COMPONENT
:
737 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
) {
742 case GL_STENCIL_INDEX
:
743 if (att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
747 case GL_DEPTH_STENCIL_EXT
:
748 if (att
[BUFFER_DEPTH
].Type
== GL_NONE
||
749 att
[BUFFER_STENCIL
].Type
== GL_NONE
) {
755 "Unexpected format 0x%x in renderbuffer_exists",
766 * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
767 * glCopyTex[Sub]Image, etc) exists.
768 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
769 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
770 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
773 _mesa_source_buffer_exists(struct gl_context
*ctx
, GLenum format
)
775 return renderbuffer_exists(ctx
, ctx
->ReadBuffer
, format
, GL_TRUE
);
780 * As above, but for drawing operations.
783 _mesa_dest_buffer_exists(struct gl_context
*ctx
, GLenum format
)
785 return renderbuffer_exists(ctx
, ctx
->DrawBuffer
, format
, GL_FALSE
);
790 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES queries (using
791 * GetIntegerv, GetFramebufferParameteriv, etc)
793 * If @fb is NULL, the method returns the value for the current bound
797 _mesa_get_color_read_format(struct gl_context
*ctx
,
798 struct gl_framebuffer
*fb
,
802 _mesa_update_state(ctx
);
805 fb
= ctx
->ReadBuffer
;
807 if (!fb
|| !fb
->_ColorReadBuffer
) {
809 * From OpenGL 4.5 spec, section 18.2.2 "ReadPixels":
811 * "An INVALID_OPERATION error is generated by GetIntegerv if pname
812 * is IMPLEMENTATION_COLOR_READ_FORMAT or IMPLEMENTATION_COLOR_-
813 * READ_TYPE and any of:
814 * * the read framebuffer is not framebuffer complete.
815 * * the read framebuffer is a framebuffer object, and the selected
816 * read buffer (see section 18.2.1) has no image attached.
817 * * the selected read buffer is NONE."
819 * There is not equivalent quote for GetFramebufferParameteriv or
820 * GetNamedFramebufferParameteriv, but from section 9.2.3 "Framebuffer
823 * "Values of framebuffer-dependent state are identical to those that
824 * would be obtained were the framebuffer object bound and queried
825 * using the simple state queries in that table."
827 * Where "using the simple state queries" refer to use GetIntegerv. So
828 * we will assume that on that situation the same error should be
831 _mesa_error(ctx
, GL_INVALID_OPERATION
,
832 "%s(GL_IMPLEMENTATION_COLOR_READ_FORMAT: no GL_READ_BUFFER)",
837 const mesa_format format
= fb
->_ColorReadBuffer
->Format
;
838 const GLenum data_type
= _mesa_get_format_datatype(format
);
840 if (format
== MESA_FORMAT_B8G8R8A8_UNORM
)
842 else if (format
== MESA_FORMAT_B5G6R5_UNORM
)
844 else if (format
== MESA_FORMAT_R_UNORM8
)
848 case GL_UNSIGNED_INT
:
850 return GL_RGBA_INTEGER
;
859 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES queries (using
860 * GetIntegerv, GetFramebufferParameteriv, etc)
862 * If @fb is NULL, the method returns the value for the current bound
866 _mesa_get_color_read_type(struct gl_context
*ctx
,
867 struct gl_framebuffer
*fb
,
871 _mesa_update_state(ctx
);
874 fb
= ctx
->ReadBuffer
;
876 if (!fb
|| !fb
->_ColorReadBuffer
) {
878 * See comment on _mesa_get_color_read_format
880 _mesa_error(ctx
, GL_INVALID_OPERATION
,
881 "%s(GL_IMPLEMENTATION_COLOR_READ_TYPE: no GL_READ_BUFFER)",
886 const GLenum format
= fb
->_ColorReadBuffer
->Format
;
887 const GLenum data_type
= _mesa_get_format_datatype(format
);
889 if (format
== MESA_FORMAT_B5G6R5_UNORM
)
890 return GL_UNSIGNED_SHORT_5_6_5
;
892 if (format
== MESA_FORMAT_B10G10R10A2_UNORM
||
893 format
== MESA_FORMAT_B10G10R10X2_UNORM
||
894 format
== MESA_FORMAT_R10G10B10A2_UNORM
||
895 format
== MESA_FORMAT_R10G10B10X2_UNORM
)
896 return GL_UNSIGNED_INT_2_10_10_10_REV
;
899 case GL_SIGNED_NORMALIZED
:
901 case GL_UNSIGNED_INT
:
905 case GL_UNSIGNED_NORMALIZED
:
907 return GL_UNSIGNED_BYTE
;
914 * Returns the read renderbuffer for the specified format.
916 struct gl_renderbuffer
*
917 _mesa_get_read_renderbuffer_for_format(const struct gl_context
*ctx
,
920 const struct gl_framebuffer
*rfb
= ctx
->ReadBuffer
;
922 if (_mesa_is_color_format(format
)) {
923 return rfb
->Attachment
[rfb
->_ColorReadBufferIndex
].Renderbuffer
;
924 } else if (_mesa_is_depth_format(format
) ||
925 _mesa_is_depthstencil_format(format
)) {
926 return rfb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
928 return rfb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
934 * Print framebuffer info to stderr, for debugging.
937 _mesa_print_framebuffer(const struct gl_framebuffer
*fb
)
939 fprintf(stderr
, "Mesa Framebuffer %u at %p\n", fb
->Name
, (void *) fb
);
940 fprintf(stderr
, " Size: %u x %u Status: %s\n", fb
->Width
, fb
->Height
,
941 _mesa_enum_to_string(fb
->_Status
));
942 fprintf(stderr
, " Attachments:\n");
944 for (unsigned i
= 0; i
< BUFFER_COUNT
; i
++) {
945 const struct gl_renderbuffer_attachment
*att
= &fb
->Attachment
[i
];
946 if (att
->Type
== GL_TEXTURE
) {
947 const struct gl_texture_image
*texImage
= att
->Renderbuffer
->TexImage
;
949 " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n",
950 i
, att
->Texture
->Name
, att
->TextureLevel
, att
->CubeMapFace
,
951 att
->Zoffset
, att
->Complete
);
952 fprintf(stderr
, " Size: %u x %u x %u Format %s\n",
953 texImage
->Width
, texImage
->Height
, texImage
->Depth
,
954 _mesa_get_format_name(texImage
->TexFormat
));
956 else if (att
->Type
== GL_RENDERBUFFER
) {
957 fprintf(stderr
, " %2d: Renderbuffer %u, complete %d\n",
958 i
, att
->Renderbuffer
->Name
, att
->Complete
);
959 fprintf(stderr
, " Size: %u x %u Format %s\n",
960 att
->Renderbuffer
->Width
, att
->Renderbuffer
->Height
,
961 _mesa_get_format_name(att
->Renderbuffer
->Format
));
964 fprintf(stderr
, " %2d: none\n", i
);
970 _mesa_is_front_buffer_reading(const struct gl_framebuffer
*fb
)
972 if (!fb
|| _mesa_is_user_fbo(fb
))
975 return fb
->_ColorReadBufferIndex
== BUFFER_FRONT_LEFT
;
979 _mesa_is_front_buffer_drawing(const struct gl_framebuffer
*fb
)
981 if (!fb
|| _mesa_is_user_fbo(fb
))
984 return (fb
->_NumColorDrawBuffers
>= 1 &&
985 fb
->_ColorDrawBufferIndexes
[0] == BUFFER_FRONT_LEFT
);
989 _mesa_geometric_nonvalidated_samples(const struct gl_framebuffer
*buffer
)
991 return buffer
->_HasAttachments
?
992 buffer
->Visual
.samples
:
993 buffer
->DefaultGeometry
.NumSamples
;
997 _mesa_is_multisample_enabled(const struct gl_context
*ctx
)
999 /* The sample count may not be validated by the driver, but when it is set,
1000 * we know that is in a valid range and no driver should ever validate a
1001 * multisampled framebuffer to non-multisampled and vice-versa.
1003 return ctx
->Multisample
.Enabled
&&
1005 _mesa_geometric_nonvalidated_samples(ctx
->DrawBuffer
) >= 1;
1009 * Is alpha testing enabled and applicable to the currently bound
1013 _mesa_is_alpha_test_enabled(const struct gl_context
*ctx
)
1015 bool buffer0_is_integer
= ctx
->DrawBuffer
->_IntegerBuffers
& 0x1;
1016 return (ctx
->Color
.AlphaEnabled
&& !buffer0_is_integer
);
1020 * Is alpha to coverage enabled and applicable to the currently bound
1024 _mesa_is_alpha_to_coverage_enabled(const struct gl_context
*ctx
)
1026 bool buffer0_is_integer
= ctx
->DrawBuffer
->_IntegerBuffers
& 0x1;
1027 return (ctx
->Multisample
.SampleAlphaToCoverage
&&
1028 _mesa_is_multisample_enabled(ctx
) &&
1029 !buffer0_is_integer
);