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.
37 #include "depthstencil.h"
43 #include "framebuffer.h"
44 #include "renderbuffer.h"
50 * Compute/set the _DepthMax field for the given framebuffer.
51 * This value depends on the Z buffer resolution.
54 compute_depth_max(struct gl_framebuffer *fb)
56 if (fb->Visual.depthBits == 0) {
57 /* Special case. Even if we don't have a depth buffer we need
58 * good values for DepthMax for Z vertex transformation purposes
59 * and for per-fragment fog computation.
61 fb->_DepthMax = (1 << 16) - 1;
63 else if (fb->Visual.depthBits < 32) {
64 fb->_DepthMax = (1 << fb->Visual.depthBits) - 1;
67 /* Special case since shift values greater than or equal to the
68 * number of bits in the left hand expression's type are undefined.
70 fb->_DepthMax = 0xffffffff;
72 fb->_DepthMaxF = (GLfloat) fb->_DepthMax;
74 /* Minimum resolvable depth value, for polygon offset */
75 fb->_MRD = (GLfloat)1.0 / fb->_DepthMaxF;
79 * Create and initialize a gl_framebuffer object.
80 * This is intended for creating _window_system_ framebuffers, not generic
81 * framebuffer objects ala GL_EXT_framebuffer_object.
83 * \sa _mesa_new_framebuffer
85 struct gl_framebuffer *
86 _mesa_create_framebuffer(const struct gl_config *visual)
88 struct gl_framebuffer *fb = CALLOC_STRUCT(gl_framebuffer);
91 _mesa_initialize_window_framebuffer(fb, visual);
98 * Allocate a new gl_framebuffer object.
99 * This is the default function for ctx->Driver.NewFramebuffer().
100 * This is for allocating user-created framebuffers, not window-system
102 * \sa _mesa_create_framebuffer
104 struct gl_framebuffer *
105 _mesa_new_framebuffer(struct gl_context *ctx, GLuint name)
107 struct gl_framebuffer *fb;
110 fb = CALLOC_STRUCT(gl_framebuffer);
112 _mesa_initialize_user_framebuffer(fb, name);
119 * Initialize a gl_framebuffer object. Typically used to initialize
120 * window system-created framebuffers, not user-created framebuffers.
121 * \sa _mesa_initialize_user_framebuffer
124 _mesa_initialize_window_framebuffer(struct gl_framebuffer *fb,
125 const struct gl_config *visual)
130 memset(fb, 0, sizeof(struct gl_framebuffer));
132 _glthread_INIT_MUTEX(fb->Mutex);
136 /* save the visual */
137 fb->Visual = *visual;
139 /* Init read/draw renderbuffer state */
140 if (visual->doubleBufferMode) {
141 fb->_NumColorDrawBuffers = 1;
142 fb->ColorDrawBuffer[0] = GL_BACK;
143 fb->_ColorDrawBufferIndexes[0] = BUFFER_BACK_LEFT;
144 fb->ColorReadBuffer = GL_BACK;
145 fb->_ColorReadBufferIndex = BUFFER_BACK_LEFT;
148 fb->_NumColorDrawBuffers = 1;
149 fb->ColorDrawBuffer[0] = GL_FRONT;
150 fb->_ColorDrawBufferIndexes[0] = BUFFER_FRONT_LEFT;
151 fb->ColorReadBuffer = GL_FRONT;
152 fb->_ColorReadBufferIndex = BUFFER_FRONT_LEFT;
155 fb->Delete = _mesa_destroy_framebuffer;
156 fb->_Status = GL_FRAMEBUFFER_COMPLETE_EXT;
158 compute_depth_max(fb);
163 * Initialize a user-created gl_framebuffer object.
164 * \sa _mesa_initialize_window_framebuffer
167 _mesa_initialize_user_framebuffer(struct gl_framebuffer *fb, GLuint name)
172 memset(fb, 0, sizeof(struct gl_framebuffer));
176 fb->_NumColorDrawBuffers = 1;
177 fb->ColorDrawBuffer[0] = GL_COLOR_ATTACHMENT0_EXT;
178 fb->_ColorDrawBufferIndexes[0] = BUFFER_COLOR0;
179 fb->ColorReadBuffer = GL_COLOR_ATTACHMENT0_EXT;
180 fb->_ColorReadBufferIndex = BUFFER_COLOR0;
181 fb->Delete = _mesa_destroy_framebuffer;
182 _glthread_INIT_MUTEX(fb->Mutex);
187 * Deallocate buffer and everything attached to it.
188 * Typically called via the gl_framebuffer->Delete() method.
191 _mesa_destroy_framebuffer(struct gl_framebuffer *fb)
194 _mesa_free_framebuffer_data(fb);
201 * Free all the data hanging off the given gl_framebuffer, but don't free
202 * the gl_framebuffer object itself.
205 _mesa_free_framebuffer_data(struct gl_framebuffer *fb)
210 assert(fb->RefCount == 0);
212 _glthread_DESTROY_MUTEX(fb->Mutex);
214 for (i = 0; i < BUFFER_COUNT; i++) {
215 struct gl_renderbuffer_attachment *att = &fb->Attachment[i];
216 if (att->Renderbuffer) {
217 _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);
220 _mesa_reference_texobj(&att->Texture, NULL);
222 ASSERT(!att->Renderbuffer);
223 ASSERT(!att->Texture);
227 /* unbind _Depth/_StencilBuffer to decr ref counts */
228 _mesa_reference_renderbuffer(&fb->_DepthBuffer, NULL);
229 _mesa_reference_renderbuffer(&fb->_StencilBuffer, NULL);
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 /* For window system framebuffers, Name is zero */
290 assert(fb->Name == 0);
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");
310 if (fb->_DepthBuffer) {
311 struct gl_renderbuffer *rb = fb->_DepthBuffer;
312 if (rb->Width != width || rb->Height != height) {
313 if (!rb->AllocStorage(ctx, rb, rb->InternalFormat, width, height)) {
314 _mesa_error(ctx, GL_OUT_OF_MEMORY, "Resizing framebuffer");
319 if (fb->_StencilBuffer) {
320 struct gl_renderbuffer *rb = fb->_StencilBuffer;
321 if (rb->Width != width || rb->Height != height) {
322 if (!rb->AllocStorage(ctx, rb, rb->InternalFormat, width, height)) {
323 _mesa_error(ctx, GL_OUT_OF_MEMORY, "Resizing framebuffer");
332 /* update scissor / window bounds */
333 _mesa_update_draw_buffer_bounds(ctx);
334 /* Signal new buffer state so that swrast will update its clipping
335 * info (the CLIP_BIT flag).
337 ctx->NewState |= _NEW_BUFFERS;
344 * XXX THIS IS OBSOLETE - drivers should take care of detecting window
345 * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
347 * GL_MESA_resize_buffers extension.
349 * When this function is called, we'll ask the window system how large
350 * the current window is. If it's a new size, we'll call the driver's
351 * ResizeBuffers function. The driver will then resize its color buffers
352 * as needed, and maybe call the swrast's routine for reallocating
353 * swrast-managed depth/stencil/accum/etc buffers.
354 * \note This function should only be called through the GL API, not
355 * from device drivers (as was done in the past).
358 _mesa_resizebuffers( struct gl_context *ctx )
360 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
362 if (MESA_VERBOSE & VERBOSE_API)
363 _mesa_debug(ctx, "glResizeBuffersMESA\n");
365 if (!ctx->Driver.GetBufferSize) {
369 if (ctx->WinSysDrawBuffer) {
370 GLuint newWidth, newHeight;
371 struct gl_framebuffer *buffer = ctx->WinSysDrawBuffer;
373 assert(buffer->Name == 0);
375 /* ask device driver for size of output buffer */
376 ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
378 /* see if size of device driver's color buffer (window) has changed */
379 if (buffer->Width != newWidth || buffer->Height != newHeight) {
380 if (ctx->Driver.ResizeBuffers)
381 ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );
385 if (ctx->WinSysReadBuffer
386 && ctx->WinSysReadBuffer != ctx->WinSysDrawBuffer) {
387 GLuint newWidth, newHeight;
388 struct gl_framebuffer *buffer = ctx->WinSysReadBuffer;
390 assert(buffer->Name == 0);
392 /* ask device driver for size of read buffer */
393 ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
395 /* see if size of device driver's color buffer (window) has changed */
396 if (buffer->Width != newWidth || buffer->Height != newHeight) {
397 if (ctx->Driver.ResizeBuffers)
398 ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );
402 ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */
407 * XXX THIS IS OBSOLETE
410 _mesa_ResizeBuffersMESA( void )
412 GET_CURRENT_CONTEXT(ctx);
414 if (ctx->Extensions.MESA_resize_buffers)
415 _mesa_resizebuffers( ctx );
421 * Examine all the framebuffer's renderbuffers to update the Width/Height
422 * fields of the framebuffer. If we have renderbuffers with different
423 * sizes, set the framebuffer's width and height to the min size.
424 * Note: this is only intended for user-created framebuffers, not
425 * window-system framebuffes.
428 update_framebuffer_size(struct gl_context *ctx, struct gl_framebuffer *fb)
430 GLuint minWidth = ~0, minHeight = ~0;
433 /* user-created framebuffers only */
436 for (i = 0; i < BUFFER_COUNT; i++) {
437 struct gl_renderbuffer_attachment *att = &fb->Attachment[i];
438 const struct gl_renderbuffer *rb = att->Renderbuffer;
440 minWidth = MIN2(minWidth, rb->Width);
441 minHeight = MIN2(minHeight, rb->Height);
445 if (minWidth != ~0) {
446 fb->Width = minWidth;
447 fb->Height = minHeight;
457 * Update the context's current drawing buffer's Xmin, Xmax, Ymin, Ymax fields.
458 * These values are computed from the buffer's width and height and
459 * the scissor box, if it's enabled.
460 * \param ctx the GL context.
463 _mesa_update_draw_buffer_bounds(struct gl_context *ctx)
465 struct gl_framebuffer *buffer = ctx->DrawBuffer;
471 /* user-created framebuffer size depends on the renderbuffers */
472 update_framebuffer_size(ctx, buffer);
477 buffer->_Xmax = buffer->Width;
478 buffer->_Ymax = buffer->Height;
480 if (ctx->Scissor.Enabled) {
481 if (ctx->Scissor.X > buffer->_Xmin) {
482 buffer->_Xmin = ctx->Scissor.X;
484 if (ctx->Scissor.Y > buffer->_Ymin) {
485 buffer->_Ymin = ctx->Scissor.Y;
487 if (ctx->Scissor.X + ctx->Scissor.Width < buffer->_Xmax) {
488 buffer->_Xmax = ctx->Scissor.X + ctx->Scissor.Width;
490 if (ctx->Scissor.Y + ctx->Scissor.Height < buffer->_Ymax) {
491 buffer->_Ymax = ctx->Scissor.Y + ctx->Scissor.Height;
493 /* finally, check for empty region */
494 if (buffer->_Xmin > buffer->_Xmax) {
495 buffer->_Xmin = buffer->_Xmax;
497 if (buffer->_Ymin > buffer->_Ymax) {
498 buffer->_Ymin = buffer->_Ymax;
502 ASSERT(buffer->_Xmin <= buffer->_Xmax);
503 ASSERT(buffer->_Ymin <= buffer->_Ymax);
508 * The glGet queries of the framebuffer red/green/blue size, stencil size,
509 * etc. are satisfied by the fields of ctx->DrawBuffer->Visual. These can
510 * change depending on the renderbuffer bindings. This function updates
511 * the given framebuffer's Visual from the current renderbuffer bindings.
513 * This may apply to user-created framebuffers or window system framebuffers.
515 * Also note: ctx->DrawBuffer->Visual.depthBits might not equal
516 * ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer.DepthBits.
517 * The former one is used to convert floating point depth values into
521 _mesa_update_framebuffer_visual(struct gl_context *ctx,
522 struct gl_framebuffer *fb)
526 memset(&fb->Visual, 0, sizeof(fb->Visual));
527 fb->Visual.rgbMode = GL_TRUE; /* assume this */
529 #if 0 /* this _might_ be needed */
530 if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
531 /* leave visual fields zero'd */
536 /* find first RGB renderbuffer */
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 GLenum baseFormat = _mesa_get_format_base_format(rb->Format);
541 const gl_format fmt = rb->Format;
543 if (_mesa_is_legal_color_format(ctx, baseFormat)) {
544 fb->Visual.redBits = _mesa_get_format_bits(fmt, GL_RED_BITS);
545 fb->Visual.greenBits = _mesa_get_format_bits(fmt, GL_GREEN_BITS);
546 fb->Visual.blueBits = _mesa_get_format_bits(fmt, GL_BLUE_BITS);
547 fb->Visual.alphaBits = _mesa_get_format_bits(fmt, GL_ALPHA_BITS);
548 fb->Visual.rgbBits = fb->Visual.redBits
549 + fb->Visual.greenBits + fb->Visual.blueBits;
550 fb->Visual.samples = rb->NumSamples;
551 fb->Visual.sampleBuffers = rb->NumSamples > 0 ? 1 : 0;
552 if (_mesa_get_format_color_encoding(fmt) == GL_SRGB)
553 fb->Visual.sRGBCapable = ctx->Const.sRGBCapable;
559 fb->Visual.floatMode = GL_FALSE;
560 for (i = 0; i < BUFFER_COUNT; i++) {
561 if (fb->Attachment[i].Renderbuffer) {
562 const struct gl_renderbuffer *rb = fb->Attachment[i].Renderbuffer;
563 const gl_format fmt = rb->Format;
565 if (_mesa_get_format_datatype(fmt) == GL_FLOAT) {
566 fb->Visual.floatMode = GL_TRUE;
572 if (fb->Attachment[BUFFER_DEPTH].Renderbuffer) {
573 const struct gl_renderbuffer *rb =
574 fb->Attachment[BUFFER_DEPTH].Renderbuffer;
575 const gl_format fmt = rb->Format;
576 fb->Visual.haveDepthBuffer = GL_TRUE;
577 fb->Visual.depthBits = _mesa_get_format_bits(fmt, GL_DEPTH_BITS);
580 if (fb->Attachment[BUFFER_STENCIL].Renderbuffer) {
581 const struct gl_renderbuffer *rb =
582 fb->Attachment[BUFFER_STENCIL].Renderbuffer;
583 const gl_format fmt = rb->Format;
584 fb->Visual.haveStencilBuffer = GL_TRUE;
585 fb->Visual.stencilBits = _mesa_get_format_bits(fmt, GL_STENCIL_BITS);
588 if (fb->Attachment[BUFFER_ACCUM].Renderbuffer) {
589 const struct gl_renderbuffer *rb =
590 fb->Attachment[BUFFER_ACCUM].Renderbuffer;
591 const gl_format fmt = rb->Format;
592 fb->Visual.haveAccumBuffer = GL_TRUE;
593 fb->Visual.accumRedBits = _mesa_get_format_bits(fmt, GL_RED_BITS);
594 fb->Visual.accumGreenBits = _mesa_get_format_bits(fmt, GL_GREEN_BITS);
595 fb->Visual.accumBlueBits = _mesa_get_format_bits(fmt, GL_BLUE_BITS);
596 fb->Visual.accumAlphaBits = _mesa_get_format_bits(fmt, GL_ALPHA_BITS);
599 compute_depth_max(fb);
604 * Update the framebuffer's _DepthBuffer field using the renderbuffer
605 * found at the given attachment index.
607 * If that attachment points to a combined GL_DEPTH_STENCIL renderbuffer,
608 * create and install a depth wrapper/adaptor.
610 * \param fb the framebuffer whose _DepthBuffer field to update
613 update_depth_buffer(struct gl_context *ctx, struct gl_framebuffer *fb)
615 struct gl_renderbuffer *depthRb =
616 fb->Attachment[BUFFER_DEPTH].Renderbuffer;
618 if (depthRb && _mesa_is_format_packed_depth_stencil(depthRb->Format)) {
619 /* The attached depth buffer is a GL_DEPTH_STENCIL renderbuffer */
620 if (!fb->_DepthBuffer
621 || fb->_DepthBuffer->Wrapped != depthRb
622 || _mesa_get_format_base_format(fb->_DepthBuffer->Format) != GL_DEPTH_COMPONENT) {
623 /* need to update wrapper */
624 struct gl_renderbuffer *wrapper;
626 if (depthRb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
627 wrapper = _mesa_new_z32f_renderbuffer_wrapper(ctx, depthRb);
630 wrapper = _mesa_new_z24_renderbuffer_wrapper(ctx, depthRb);
632 _mesa_reference_renderbuffer(&fb->_DepthBuffer, wrapper);
633 ASSERT(fb->_DepthBuffer->Wrapped == depthRb);
637 /* depthRb may be null */
638 _mesa_reference_renderbuffer(&fb->_DepthBuffer, depthRb);
644 * Update the framebuffer's _StencilBuffer field using the renderbuffer
645 * found at the given attachment index.
647 * If that attachment points to a combined GL_DEPTH_STENCIL renderbuffer,
648 * create and install a stencil wrapper/adaptor.
650 * \param fb the framebuffer whose _StencilBuffer field to update
653 update_stencil_buffer(struct gl_context *ctx, struct gl_framebuffer *fb)
655 struct gl_renderbuffer *stencilRb =
656 fb->Attachment[BUFFER_STENCIL].Renderbuffer;
658 if (stencilRb && _mesa_is_format_packed_depth_stencil(stencilRb->Format)) {
659 /* The attached stencil buffer is a GL_DEPTH_STENCIL renderbuffer */
660 if (!fb->_StencilBuffer
661 || fb->_StencilBuffer->Wrapped != stencilRb
662 || _mesa_get_format_base_format(fb->_StencilBuffer->Format) != GL_STENCIL_INDEX) {
663 /* need to update wrapper */
664 struct gl_renderbuffer *wrapper
665 = _mesa_new_s8_renderbuffer_wrapper(ctx, stencilRb);
666 _mesa_reference_renderbuffer(&fb->_StencilBuffer, wrapper);
667 ASSERT(fb->_StencilBuffer->Wrapped == stencilRb);
671 /* stencilRb may be null */
672 _mesa_reference_renderbuffer(&fb->_StencilBuffer, stencilRb);
678 * Example DrawBuffers scenarios:
680 * 1. glDrawBuffer(GL_FRONT_AND_BACK), fixed-func or shader writes to
681 * "gl_FragColor" or program writes to the "result.color" register:
683 * fragment color output renderbuffer
684 * --------------------- ---------------
685 * color[0] Front, Back
688 * 2. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]), shader writes to
689 * gl_FragData[i] or program writes to result.color[i] registers:
691 * fragment color output renderbuffer
692 * --------------------- ---------------
698 * 3. glDrawBuffers(3, [GL_FRONT, GL_AUX0, GL_AUX1]) and shader writes to
699 * gl_FragColor, or fixed function:
701 * fragment color output renderbuffer
702 * --------------------- ---------------
703 * color[0] Front, Aux0, Aux1
706 * In either case, the list of renderbuffers is stored in the
707 * framebuffer->_ColorDrawBuffers[] array and
708 * framebuffer->_NumColorDrawBuffers indicates the number of buffers.
709 * The renderer (like swrast) has to look at the current fragment shader
710 * to see if it writes to gl_FragColor vs. gl_FragData[i] to determine
711 * how to map color outputs to renderbuffers.
713 * Note that these two calls are equivalent (for fixed function fragment
715 * a) glDrawBuffer(GL_FRONT_AND_BACK); (assuming non-stereo framebuffer)
716 * b) glDrawBuffers(2, [GL_FRONT_LEFT, GL_BACK_LEFT]);
723 * Update the (derived) list of color drawing renderbuffer pointers.
724 * Later, when we're rendering we'll loop from 0 to _NumColorDrawBuffers
728 update_color_draw_buffers(struct gl_context *ctx, struct gl_framebuffer *fb)
732 /* set 0th buffer to NULL now in case _NumColorDrawBuffers is zero */
733 fb->_ColorDrawBuffers[0] = NULL;
735 for (output = 0; output < fb->_NumColorDrawBuffers; output++) {
736 GLint buf = fb->_ColorDrawBufferIndexes[output];
738 fb->_ColorDrawBuffers[output] = fb->Attachment[buf].Renderbuffer;
741 fb->_ColorDrawBuffers[output] = NULL;
748 * Update the (derived) color read renderbuffer pointer.
749 * Unlike the DrawBuffer, we can only read from one (or zero) color buffers.
752 update_color_read_buffer(struct gl_context *ctx, struct gl_framebuffer *fb)
755 if (fb->_ColorReadBufferIndex == -1 ||
759 fb->_ColorReadBuffer = NULL; /* legal! */
762 ASSERT(fb->_ColorReadBufferIndex >= 0);
763 ASSERT(fb->_ColorReadBufferIndex < BUFFER_COUNT);
765 = fb->Attachment[fb->_ColorReadBufferIndex].Renderbuffer;
771 * Update a gl_framebuffer's derived state.
773 * Specifically, update these framebuffer fields:
775 * _NumColorDrawBuffers
780 * If the framebuffer is user-created, make sure it's complete.
782 * The following functions (at least) can effect framebuffer state:
783 * glReadBuffer, glDrawBuffer, glDrawBuffersARB, glFramebufferRenderbufferEXT,
784 * glRenderbufferStorageEXT.
787 update_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
790 /* This is a window-system framebuffer */
791 /* Need to update the FB's GL_DRAW_BUFFER state to match the
792 * context state (GL_READ_BUFFER too).
794 if (fb->ColorDrawBuffer[0] != ctx->Color.DrawBuffer[0]) {
795 _mesa_drawbuffers(ctx, ctx->Const.MaxDrawBuffers,
796 ctx->Color.DrawBuffer, NULL);
800 /* This is a user-created framebuffer.
801 * Completeness only matters for user-created framebuffers.
803 if (fb->_Status != GL_FRAMEBUFFER_COMPLETE) {
804 _mesa_test_framebuffer_completeness(ctx, fb);
808 /* Strictly speaking, we don't need to update the draw-state
809 * if this FB is bound as ctx->ReadBuffer (and conversely, the
810 * read-state if this FB is bound as ctx->DrawBuffer), but no
813 update_color_draw_buffers(ctx, fb);
814 update_color_read_buffer(ctx, fb);
815 update_depth_buffer(ctx, fb);
816 update_stencil_buffer(ctx, fb);
818 compute_depth_max(fb);
823 * Update state related to the current draw/read framebuffers.
826 _mesa_update_framebuffer(struct gl_context *ctx)
828 struct gl_framebuffer *drawFb;
829 struct gl_framebuffer *readFb;
832 drawFb = ctx->DrawBuffer;
833 readFb = ctx->ReadBuffer;
835 update_framebuffer(ctx, drawFb);
836 if (readFb != drawFb)
837 update_framebuffer(ctx, readFb);
842 * Check if the renderbuffer for a read/draw operation exists.
843 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
844 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
845 * \param reading if TRUE, we're going to read from the buffer,
846 if FALSE, we're going to write to the buffer.
847 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
850 renderbuffer_exists(struct gl_context *ctx,
851 struct gl_framebuffer *fb,
855 const struct gl_renderbuffer_attachment *att = fb->Attachment;
857 /* If we don't know the framebuffer status, update it now */
858 if (fb->_Status == 0) {
859 _mesa_test_framebuffer_completeness(ctx, fb);
862 if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
873 case GL_LUMINANCE_ALPHA:
881 case GL_RED_INTEGER_EXT:
883 case GL_GREEN_INTEGER_EXT:
884 case GL_BLUE_INTEGER_EXT:
885 case GL_ALPHA_INTEGER_EXT:
886 case GL_RGB_INTEGER_EXT:
887 case GL_RGBA_INTEGER_EXT:
888 case GL_BGR_INTEGER_EXT:
889 case GL_BGRA_INTEGER_EXT:
890 case GL_LUMINANCE_INTEGER_EXT:
891 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
893 /* about to read from a color buffer */
894 const struct gl_renderbuffer *readBuf = fb->_ColorReadBuffer;
898 ASSERT(_mesa_get_format_bits(readBuf->Format, GL_RED_BITS) > 0 ||
899 _mesa_get_format_bits(readBuf->Format, GL_ALPHA_BITS) > 0 ||
900 _mesa_get_format_bits(readBuf->Format, GL_TEXTURE_LUMINANCE_SIZE) > 0 ||
901 _mesa_get_format_bits(readBuf->Format, GL_TEXTURE_INTENSITY_SIZE) > 0 ||
902 _mesa_get_format_bits(readBuf->Format, GL_INDEX_BITS) > 0);
905 /* about to draw to zero or more color buffers (none is OK) */
910 case GL_DEPTH_COMPONENT:
911 if (att[BUFFER_DEPTH].Type == GL_NONE) {
916 case GL_STENCIL_INDEX:
917 if (att[BUFFER_STENCIL].Type == GL_NONE) {
921 case GL_DEPTH_STENCIL_EXT:
922 if (att[BUFFER_DEPTH].Type == GL_NONE ||
923 att[BUFFER_STENCIL].Type == GL_NONE) {
929 "Unexpected format 0x%x in renderbuffer_exists",
940 * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
941 * glCopyTex[Sub]Image, etc) exists.
942 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
943 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
944 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
947 _mesa_source_buffer_exists(struct gl_context *ctx, GLenum format)
949 return renderbuffer_exists(ctx, ctx->ReadBuffer, format, GL_TRUE);
954 * As above, but for drawing operations.
955 * XXX could do some code merging w/ above function.
958 _mesa_dest_buffer_exists(struct gl_context *ctx, GLenum format)
960 return renderbuffer_exists(ctx, ctx->DrawBuffer, format, GL_FALSE);
965 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES query.
968 _mesa_get_color_read_format(struct gl_context *ctx)
970 switch (ctx->ReadBuffer->_ColorReadBuffer->Format) {
971 case MESA_FORMAT_ARGB8888:
973 case MESA_FORMAT_RGB565:
982 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES query.
985 _mesa_get_color_read_type(struct gl_context *ctx)
987 switch (ctx->ReadBuffer->_ColorReadBuffer->Format) {
988 case MESA_FORMAT_ARGB8888:
989 return GL_UNSIGNED_BYTE;
990 case MESA_FORMAT_RGB565:
991 return GL_UNSIGNED_SHORT_5_6_5_REV;
993 return GL_UNSIGNED_BYTE;
999 * Print framebuffer info to stderr, for debugging.
1002 _mesa_print_framebuffer(const struct gl_framebuffer *fb)
1006 fprintf(stderr, "Mesa Framebuffer %u at %p\n", fb->Name, (void *) fb);
1007 fprintf(stderr, " Size: %u x %u Status: %s\n", fb->Width, fb->Height,
1008 _mesa_lookup_enum_by_nr(fb->_Status));
1009 fprintf(stderr, " Attachments:\n");
1011 for (i = 0; i < BUFFER_COUNT; i++) {
1012 const struct gl_renderbuffer_attachment *att = &fb->Attachment[i];
1013 if (att->Type == GL_TEXTURE) {
1014 const struct gl_texture_image *texImage =
1015 _mesa_get_attachment_teximage_const(att);
1017 " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n",
1018 i, att->Texture->Name, att->TextureLevel, att->CubeMapFace,
1019 att->Zoffset, att->Complete);
1020 fprintf(stderr, " Size: %u x %u x %u Format %s\n",
1021 texImage->Width, texImage->Height, texImage->Depth,
1022 _mesa_get_format_name(texImage->TexFormat));
1024 else if (att->Type == GL_RENDERBUFFER) {
1025 fprintf(stderr, " %2d: Renderbuffer %u, complete %d\n",
1026 i, att->Renderbuffer->Name, att->Complete);
1027 fprintf(stderr, " Size: %u x %u Format %s\n",
1028 att->Renderbuffer->Width, att->Renderbuffer->Height,
1029 _mesa_get_format_name(att->Renderbuffer->Format));
1032 fprintf(stderr, " %2d: none\n", i);