2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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7 * copy of this software and associated documentation files (the "Software"),
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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);
622 /* This is a user-created framebuffer.
623 * Completeness only matters for user-created framebuffers.
625 if (fb->_Status != GL_FRAMEBUFFER_COMPLETE) {
626 _mesa_test_framebuffer_completeness(ctx, fb);
630 /* Strictly speaking, we don't need to update the draw-state
631 * if this FB is bound as ctx->ReadBuffer (and conversely, the
632 * read-state if this FB is bound as ctx->DrawBuffer), but no
635 update_color_draw_buffers(ctx, fb);
636 update_color_read_buffer(ctx, fb);
638 compute_depth_max(fb);
643 * Update state related to the draw/read framebuffers.
646 _mesa_update_framebuffer(struct gl_context *ctx,
647 struct gl_framebuffer *readFb,
648 struct gl_framebuffer *drawFb)
652 update_framebuffer(ctx, drawFb);
653 if (readFb != drawFb)
654 update_framebuffer(ctx, readFb);
656 _mesa_update_clamp_vertex_color(ctx, drawFb);
657 _mesa_update_clamp_fragment_color(ctx, drawFb);
662 * Check if the renderbuffer for a read/draw operation exists.
663 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
664 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
665 * \param reading if TRUE, we're going to read from the buffer,
666 if FALSE, we're going to write to the buffer.
667 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
670 renderbuffer_exists(struct gl_context *ctx,
671 struct gl_framebuffer *fb,
675 const struct gl_renderbuffer_attachment *att = fb->Attachment;
677 /* If we don't know the framebuffer status, update it now */
678 if (fb->_Status == 0) {
679 _mesa_test_framebuffer_completeness(ctx, fb);
682 if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
693 case GL_LUMINANCE_ALPHA:
701 case GL_RED_INTEGER_EXT:
703 case GL_GREEN_INTEGER_EXT:
704 case GL_BLUE_INTEGER_EXT:
705 case GL_ALPHA_INTEGER_EXT:
706 case GL_RGB_INTEGER_EXT:
707 case GL_RGBA_INTEGER_EXT:
708 case GL_BGR_INTEGER_EXT:
709 case GL_BGRA_INTEGER_EXT:
710 case GL_LUMINANCE_INTEGER_EXT:
711 case GL_LUMINANCE_ALPHA_INTEGER_EXT:
713 /* about to read from a color buffer */
714 const struct gl_renderbuffer *readBuf = fb->_ColorReadBuffer;
718 assert(_mesa_get_format_bits(readBuf->Format, GL_RED_BITS) > 0 ||
719 _mesa_get_format_bits(readBuf->Format, GL_ALPHA_BITS) > 0 ||
720 _mesa_get_format_bits(readBuf->Format, GL_TEXTURE_LUMINANCE_SIZE) > 0 ||
721 _mesa_get_format_bits(readBuf->Format, GL_TEXTURE_INTENSITY_SIZE) > 0 ||
722 _mesa_get_format_bits(readBuf->Format, GL_INDEX_BITS) > 0);
725 /* about to draw to zero or more color buffers (none is OK) */
730 case GL_DEPTH_COMPONENT:
731 if (att[BUFFER_DEPTH].Type == GL_NONE) {
736 case GL_STENCIL_INDEX:
737 if (att[BUFFER_STENCIL].Type == GL_NONE) {
741 case GL_DEPTH_STENCIL_EXT:
742 if (att[BUFFER_DEPTH].Type == GL_NONE ||
743 att[BUFFER_STENCIL].Type == GL_NONE) {
749 "Unexpected format 0x%x in renderbuffer_exists",
760 * Check if the renderbuffer for a read operation (glReadPixels, glCopyPixels,
761 * glCopyTex[Sub]Image, etc) exists.
762 * \param format a basic image format such as GL_RGB, GL_RGBA, GL_ALPHA,
763 * GL_DEPTH_COMPONENT, etc. or GL_COLOR, GL_DEPTH, GL_STENCIL.
764 * \return GL_TRUE if buffer exists, GL_FALSE otherwise
767 _mesa_source_buffer_exists(struct gl_context *ctx, GLenum format)
769 return renderbuffer_exists(ctx, ctx->ReadBuffer, format, GL_TRUE);
774 * As above, but for drawing operations.
777 _mesa_dest_buffer_exists(struct gl_context *ctx, GLenum format)
779 return renderbuffer_exists(ctx, ctx->DrawBuffer, format, GL_FALSE);
784 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES queries (using
785 * GetIntegerv, GetFramebufferParameteriv, etc)
787 * If @fb is NULL, the method returns the value for the current bound
791 _mesa_get_color_read_format(struct gl_context *ctx,
792 struct gl_framebuffer *fb,
796 _mesa_update_state(ctx);
799 fb = ctx->ReadBuffer;
801 if (!fb || !fb->_ColorReadBuffer) {
803 * From OpenGL 4.5 spec, section 18.2.2 "ReadPixels":
805 * "An INVALID_OPERATION error is generated by GetIntegerv if pname
806 * is IMPLEMENTATION_COLOR_READ_FORMAT or IMPLEMENTATION_COLOR_-
807 * READ_TYPE and any of:
808 * * the read framebuffer is not framebuffer complete.
809 * * the read framebuffer is a framebuffer object, and the selected
810 * read buffer (see section 18.2.1) has no image attached.
811 * * the selected read buffer is NONE."
813 * There is not equivalent quote for GetFramebufferParameteriv or
814 * GetNamedFramebufferParameteriv, but from section 9.2.3 "Framebuffer
817 * "Values of framebuffer-dependent state are identical to those that
818 * would be obtained were the framebuffer object bound and queried
819 * using the simple state queries in that table."
821 * Where "using the simple state queries" refer to use GetIntegerv. So
822 * we will assume that on that situation the same error should be
825 _mesa_error(ctx, GL_INVALID_OPERATION,
826 "%s(GL_IMPLEMENTATION_COLOR_READ_FORMAT: no GL_READ_BUFFER)",
831 const mesa_format format = fb->_ColorReadBuffer->Format;
832 const GLenum data_type = _mesa_get_format_datatype(format);
834 if (format == MESA_FORMAT_B8G8R8A8_UNORM)
836 else if (format == MESA_FORMAT_B5G6R5_UNORM)
838 else if (format == MESA_FORMAT_R_UNORM8)
842 case GL_UNSIGNED_INT:
844 return GL_RGBA_INTEGER;
853 * Used to answer the GL_IMPLEMENTATION_COLOR_READ_TYPE_OES queries (using
854 * GetIntegerv, GetFramebufferParameteriv, etc)
856 * If @fb is NULL, the method returns the value for the current bound
860 _mesa_get_color_read_type(struct gl_context *ctx,
861 struct gl_framebuffer *fb,
865 _mesa_update_state(ctx);
868 fb = ctx->ReadBuffer;
870 if (!fb || !fb->_ColorReadBuffer) {
872 * See comment on _mesa_get_color_read_format
874 _mesa_error(ctx, GL_INVALID_OPERATION,
875 "%s(GL_IMPLEMENTATION_COLOR_READ_TYPE: no GL_READ_BUFFER)",
880 const GLenum format = fb->_ColorReadBuffer->Format;
881 const GLenum data_type = _mesa_get_format_datatype(format);
883 if (format == MESA_FORMAT_B5G6R5_UNORM)
884 return GL_UNSIGNED_SHORT_5_6_5;
886 if (format == MESA_FORMAT_B10G10R10A2_UNORM ||
887 format == MESA_FORMAT_B10G10R10X2_UNORM ||
888 format == MESA_FORMAT_R10G10B10A2_UNORM ||
889 format == MESA_FORMAT_R10G10B10X2_UNORM)
890 return GL_UNSIGNED_INT_2_10_10_10_REV;
893 case GL_SIGNED_NORMALIZED:
895 case GL_UNSIGNED_INT:
899 case GL_UNSIGNED_NORMALIZED:
901 return GL_UNSIGNED_BYTE;
908 * Returns the read renderbuffer for the specified format.
910 struct gl_renderbuffer *
911 _mesa_get_read_renderbuffer_for_format(const struct gl_context *ctx,
914 const struct gl_framebuffer *rfb = ctx->ReadBuffer;
916 if (_mesa_is_color_format(format)) {
917 return rfb->Attachment[rfb->_ColorReadBufferIndex].Renderbuffer;
918 } else if (_mesa_is_depth_format(format) ||
919 _mesa_is_depthstencil_format(format)) {
920 return rfb->Attachment[BUFFER_DEPTH].Renderbuffer;
922 return rfb->Attachment[BUFFER_STENCIL].Renderbuffer;
928 * Print framebuffer info to stderr, for debugging.
931 _mesa_print_framebuffer(const struct gl_framebuffer *fb)
933 fprintf(stderr, "Mesa Framebuffer %u at %p\n", fb->Name, (void *) fb);
934 fprintf(stderr, " Size: %u x %u Status: %s\n", fb->Width, fb->Height,
935 _mesa_enum_to_string(fb->_Status));
936 fprintf(stderr, " Attachments:\n");
938 for (unsigned i = 0; i < BUFFER_COUNT; i++) {
939 const struct gl_renderbuffer_attachment *att = &fb->Attachment[i];
940 if (att->Type == GL_TEXTURE) {
941 const struct gl_texture_image *texImage = att->Renderbuffer->TexImage;
943 " %2d: Texture %u, level %u, face %u, slice %u, complete %d\n",
944 i, att->Texture->Name, att->TextureLevel, att->CubeMapFace,
945 att->Zoffset, att->Complete);
946 fprintf(stderr, " Size: %u x %u x %u Format %s\n",
947 texImage->Width, texImage->Height, texImage->Depth,
948 _mesa_get_format_name(texImage->TexFormat));
950 else if (att->Type == GL_RENDERBUFFER) {
951 fprintf(stderr, " %2d: Renderbuffer %u, complete %d\n",
952 i, att->Renderbuffer->Name, att->Complete);
953 fprintf(stderr, " Size: %u x %u Format %s\n",
954 att->Renderbuffer->Width, att->Renderbuffer->Height,
955 _mesa_get_format_name(att->Renderbuffer->Format));
958 fprintf(stderr, " %2d: none\n", i);
964 _mesa_is_front_buffer_reading(const struct gl_framebuffer *fb)
966 if (!fb || _mesa_is_user_fbo(fb))
969 return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
973 _mesa_is_front_buffer_drawing(const struct gl_framebuffer *fb)
975 if (!fb || _mesa_is_user_fbo(fb))
978 return (fb->_NumColorDrawBuffers >= 1 &&
979 fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
983 _mesa_geometric_nonvalidated_samples(const struct gl_framebuffer *buffer)
985 return buffer->_HasAttachments ?
986 buffer->Visual.samples :
987 buffer->DefaultGeometry.NumSamples;
991 _mesa_is_multisample_enabled(const struct gl_context *ctx)
993 /* The sample count may not be validated by the driver, but when it is set,
994 * we know that is in a valid range and no driver should ever validate a
995 * multisampled framebuffer to non-multisampled and vice-versa.
997 return ctx->Multisample.Enabled &&
999 _mesa_geometric_nonvalidated_samples(ctx->DrawBuffer) >= 1;
1003 * Is alpha testing enabled and applicable to the currently bound
1007 _mesa_is_alpha_test_enabled(const struct gl_context *ctx)
1009 bool buffer0_is_integer = ctx->DrawBuffer->_IntegerBuffers & 0x1;
1010 return (ctx->Color.AlphaEnabled && !buffer0_is_integer);
1014 * Is alpha to coverage enabled and applicable to the currently bound
1018 _mesa_is_alpha_to_coverage_enabled(const struct gl_context *ctx)
1020 bool buffer0_is_integer = ctx->DrawBuffer->_IntegerBuffers & 0x1;
1021 return (ctx->Multisample.SampleAlphaToCoverage &&
1022 _mesa_is_multisample_enabled(ctx) &&
1023 !buffer0_is_integer);