2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 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.
28 * General framebuffer-related functions, like glClear, glScissor, etc.
47 _mesa_ClearIndex( GLfloat c
)
49 GET_CURRENT_CONTEXT(ctx
);
50 ASSERT_OUTSIDE_BEGIN_END(ctx
);
52 if (ctx
->Color
.ClearIndex
== (GLuint
) c
)
55 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
56 ctx
->Color
.ClearIndex
= (GLuint
) c
;
58 if (!ctx
->Visual
.rgbMode
&& ctx
->Driver
.ClearIndex
) {
59 /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
60 (*ctx
->Driver
.ClearIndex
)( ctx
, ctx
->Color
.ClearIndex
);
67 * Specify the clear values for the color buffers.
69 * \param red red color component.
70 * \param green green color component.
71 * \param blue blue color component.
72 * \param alpha alpha component.
76 * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
77 * change, flushes the vertices and notifies the driver via the
78 * dd_function_table::ClearColor callback.
81 _mesa_ClearColor( GLclampf red
, GLclampf green
, GLclampf blue
, GLclampf alpha
)
84 GET_CURRENT_CONTEXT(ctx
);
85 ASSERT_OUTSIDE_BEGIN_END(ctx
);
87 tmp
[0] = CLAMP(red
, 0.0F
, 1.0F
);
88 tmp
[1] = CLAMP(green
, 0.0F
, 1.0F
);
89 tmp
[2] = CLAMP(blue
, 0.0F
, 1.0F
);
90 tmp
[3] = CLAMP(alpha
, 0.0F
, 1.0F
);
92 if (TEST_EQ_4V(tmp
, ctx
->Color
.ClearColor
))
93 return; /* no change */
95 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
96 COPY_4V(ctx
->Color
.ClearColor
, tmp
);
98 if (ctx
->Visual
.rgbMode
&& ctx
->Driver
.ClearColor
) {
99 /* it's OK to call glClearColor in CI mode but it should be a NOP */
100 (*ctx
->Driver
.ClearColor
)(ctx
, ctx
->Color
.ClearColor
);
108 * \param mask bit-mask indicating the buffers to be cleared.
110 * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
111 * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
112 * etc. If the rasterization mode is set to GL_RENDER then requests the driver
113 * to clear the buffers, via the dd_function_table::Clear callback.
116 _mesa_Clear( GLbitfield mask
)
118 GET_CURRENT_CONTEXT(ctx
);
119 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
121 if (MESA_VERBOSE
& VERBOSE_API
)
122 _mesa_debug(ctx
, "glClear 0x%x\n", mask
);
124 if (mask
& ~(GL_COLOR_BUFFER_BIT
|
125 GL_DEPTH_BUFFER_BIT
|
126 GL_STENCIL_BUFFER_BIT
|
127 GL_ACCUM_BUFFER_BIT
)) {
128 /* invalid bit set */
129 _mesa_error( ctx
, GL_INVALID_VALUE
, "glClear(0x%x)", mask
);
134 _mesa_update_state( ctx
); /* update _Xmin, etc */
137 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
138 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
139 "glClear(incomplete framebuffer)");
143 if (ctx
->DrawBuffer
->Width
== 0 || ctx
->DrawBuffer
->Height
== 0 ||
144 ctx
->DrawBuffer
->_Xmin
>= ctx
->DrawBuffer
->_Xmax
||
145 ctx
->DrawBuffer
->_Ymin
>= ctx
->DrawBuffer
->_Ymax
)
148 if (ctx
->RenderMode
== GL_RENDER
) {
149 GLbitfield bufferMask
;
151 /* don't clear depth buffer if depth writing disabled */
152 if (!ctx
->Depth
.Mask
)
153 mask
&= ~GL_DEPTH_BUFFER_BIT
;
155 /* Build the bitmask to send to device driver's Clear function.
156 * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
157 * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
158 * BUFFER_BIT_COLORn flags.
161 if (mask
& GL_COLOR_BUFFER_BIT
) {
163 for (i
= 0; i
< ctx
->DrawBuffer
->_NumColorDrawBuffers
; i
++) {
164 bufferMask
|= (1 << ctx
->DrawBuffer
->_ColorDrawBufferIndexes
[i
]);
168 if ((mask
& GL_DEPTH_BUFFER_BIT
)
169 && ctx
->DrawBuffer
->Visual
.haveDepthBuffer
) {
170 bufferMask
|= BUFFER_BIT_DEPTH
;
173 if ((mask
& GL_STENCIL_BUFFER_BIT
)
174 && ctx
->DrawBuffer
->Visual
.haveStencilBuffer
) {
175 bufferMask
|= BUFFER_BIT_STENCIL
;
178 if ((mask
& GL_ACCUM_BUFFER_BIT
)
179 && ctx
->DrawBuffer
->Visual
.haveAccumBuffer
) {
180 bufferMask
|= BUFFER_BIT_ACCUM
;
183 ASSERT(ctx
->Driver
.Clear
);
184 ctx
->Driver
.Clear(ctx
, bufferMask
);
191 * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
192 * available to the rendering context (for drawing or reading).
193 * This depends on the type of framebuffer. For window system framebuffers
194 * we look at the framebuffer's visual. But for user-create framebuffers we
195 * look at the number of supported color attachments.
196 * \param fb the framebuffer to draw to, or read from
197 * \return bitmask of BUFFER_BIT_* flags
200 supported_buffer_bitmask(const GLcontext
*ctx
, const struct gl_framebuffer
*fb
)
202 GLbitfield mask
= 0x0;
205 /* A user-created renderbuffer */
207 ASSERT(ctx
->Extensions
.EXT_framebuffer_object
);
208 for (i
= 0; i
< ctx
->Const
.MaxColorAttachments
; i
++) {
209 mask
|= (BUFFER_BIT_COLOR0
<< i
);
213 /* A window system framebuffer */
215 mask
= BUFFER_BIT_FRONT_LEFT
; /* always have this */
216 if (fb
->Visual
.stereoMode
) {
217 mask
|= BUFFER_BIT_FRONT_RIGHT
;
218 if (fb
->Visual
.doubleBufferMode
) {
219 mask
|= BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
222 else if (fb
->Visual
.doubleBufferMode
) {
223 mask
|= BUFFER_BIT_BACK_LEFT
;
226 for (i
= 0; i
< fb
->Visual
.numAuxBuffers
; i
++) {
227 mask
|= (BUFFER_BIT_AUX0
<< i
);
236 * Helper routine used by glDrawBuffer and glDrawBuffersARB.
237 * Given a GLenum naming one or more color buffers (such as
238 * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
241 draw_buffer_enum_to_bitmask(GLenum buffer
)
247 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_FRONT_RIGHT
;
249 return BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
251 return BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
253 return BUFFER_BIT_FRONT_RIGHT
;
255 return BUFFER_BIT_BACK_RIGHT
;
257 return BUFFER_BIT_BACK_LEFT
;
258 case GL_FRONT_AND_BACK
:
259 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
260 | BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
262 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
;
264 return BUFFER_BIT_FRONT_LEFT
;
266 return BUFFER_BIT_AUX0
;
268 return BUFFER_BIT_AUX1
;
270 return BUFFER_BIT_AUX2
;
272 return BUFFER_BIT_AUX3
;
273 case GL_COLOR_ATTACHMENT0_EXT
:
274 return BUFFER_BIT_COLOR0
;
275 case GL_COLOR_ATTACHMENT1_EXT
:
276 return BUFFER_BIT_COLOR1
;
277 case GL_COLOR_ATTACHMENT2_EXT
:
278 return BUFFER_BIT_COLOR2
;
279 case GL_COLOR_ATTACHMENT3_EXT
:
280 return BUFFER_BIT_COLOR3
;
281 case GL_COLOR_ATTACHMENT4_EXT
:
282 return BUFFER_BIT_COLOR4
;
283 case GL_COLOR_ATTACHMENT5_EXT
:
284 return BUFFER_BIT_COLOR5
;
285 case GL_COLOR_ATTACHMENT6_EXT
:
286 return BUFFER_BIT_COLOR6
;
287 case GL_COLOR_ATTACHMENT7_EXT
:
288 return BUFFER_BIT_COLOR7
;
297 * Helper routine used by glReadBuffer.
298 * Given a GLenum naming a color buffer, return the index of the corresponding
299 * renderbuffer (a BUFFER_* value).
300 * return -1 for an invalid buffer.
303 read_buffer_enum_to_index(GLenum buffer
)
307 return BUFFER_FRONT_LEFT
;
309 return BUFFER_BACK_LEFT
;
311 return BUFFER_FRONT_RIGHT
;
313 return BUFFER_FRONT_RIGHT
;
315 return BUFFER_BACK_RIGHT
;
317 return BUFFER_BACK_LEFT
;
319 return BUFFER_FRONT_LEFT
;
321 return BUFFER_FRONT_LEFT
;
330 case GL_COLOR_ATTACHMENT0_EXT
:
331 return BUFFER_COLOR0
;
332 case GL_COLOR_ATTACHMENT1_EXT
:
333 return BUFFER_COLOR1
;
334 case GL_COLOR_ATTACHMENT2_EXT
:
335 return BUFFER_COLOR2
;
336 case GL_COLOR_ATTACHMENT3_EXT
:
337 return BUFFER_COLOR3
;
338 case GL_COLOR_ATTACHMENT4_EXT
:
339 return BUFFER_COLOR4
;
340 case GL_COLOR_ATTACHMENT5_EXT
:
341 return BUFFER_COLOR5
;
342 case GL_COLOR_ATTACHMENT6_EXT
:
343 return BUFFER_COLOR6
;
344 case GL_COLOR_ATTACHMENT7_EXT
:
345 return BUFFER_COLOR7
;
354 * Called by glDrawBuffer().
355 * Specify which renderbuffer(s) to draw into for the first color output.
356 * <buffer> can name zero, one, two or four renderbuffers!
357 * \sa _mesa_DrawBuffersARB
359 * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
361 * Note that the behaviour of this function depends on whether the
362 * current ctx->DrawBuffer is a window-system framebuffer (Name=0) or
363 * a user-created framebuffer object (Name!=0).
364 * In the former case, we update the per-context ctx->Color.DrawBuffer
365 * state var _and_ the FB's ColorDrawBuffer state.
366 * In the later case, we update the FB's ColorDrawBuffer state only.
368 * Furthermore, upon a MakeCurrent() or BindFramebuffer() call, if the
369 * new FB is a window system FB, we need to re-update the FB's
370 * ColorDrawBuffer state to match the context. This is handled in
371 * _mesa_update_framebuffer().
373 * See the GL_EXT_framebuffer_object spec for more info.
376 _mesa_DrawBuffer(GLenum buffer
)
379 GET_CURRENT_CONTEXT(ctx
);
380 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
); /* too complex... */
382 if (MESA_VERBOSE
& VERBOSE_API
) {
383 _mesa_debug(ctx
, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
386 if (buffer
== GL_NONE
) {
390 const GLbitfield supportedMask
391 = supported_buffer_bitmask(ctx
, ctx
->DrawBuffer
);
392 destMask
= draw_buffer_enum_to_bitmask(buffer
);
393 if (destMask
== BAD_MASK
) {
394 /* totally bogus buffer */
395 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawBuffer(buffer)");
398 destMask
&= supportedMask
;
399 if (destMask
== 0x0) {
400 /* none of the named color buffers exist! */
401 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffer(buffer)");
406 /* if we get here, there's no error so set new state */
407 _mesa_drawbuffers(ctx
, 1, &buffer
, &destMask
);
410 * Call device driver function.
412 if (ctx
->Driver
.DrawBuffers
)
413 ctx
->Driver
.DrawBuffers(ctx
, 1, &buffer
);
414 else if (ctx
->Driver
.DrawBuffer
)
415 ctx
->Driver
.DrawBuffer(ctx
, buffer
);
420 * Called by glDrawBuffersARB; specifies the destination color renderbuffers
421 * for N fragment program color outputs.
422 * \sa _mesa_DrawBuffer
423 * \param n number of outputs
424 * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
425 * names cannot specify more than one buffer. For example,
426 * GL_FRONT_AND_BACK is illegal.
429 _mesa_DrawBuffersARB(GLsizei n
, const GLenum
*buffers
)
432 GLbitfield usedBufferMask
, supportedMask
;
433 GLbitfield destMask
[MAX_DRAW_BUFFERS
];
434 GET_CURRENT_CONTEXT(ctx
);
435 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
437 if (!ctx
->Extensions
.ARB_draw_buffers
) {
438 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffersARB");
441 if (n
< 1 || n
> (GLsizei
) ctx
->Const
.MaxDrawBuffers
) {
442 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawBuffersARB(n)");
446 supportedMask
= supported_buffer_bitmask(ctx
, ctx
->DrawBuffer
);
447 usedBufferMask
= 0x0;
449 /* complicated error checking... */
450 for (output
= 0; output
< n
; output
++) {
451 if (buffers
[output
] == GL_NONE
) {
452 destMask
[output
] = 0x0;
455 destMask
[output
] = draw_buffer_enum_to_bitmask(buffers
[output
]);
456 if (destMask
[output
] == BAD_MASK
457 || _mesa_bitcount(destMask
[output
]) > 1) {
458 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawBuffersARB(buffer)");
461 destMask
[output
] &= supportedMask
;
462 if (destMask
[output
] == 0) {
463 _mesa_error(ctx
, GL_INVALID_OPERATION
,
464 "glDrawBuffersARB(unsupported buffer)");
467 if (destMask
[output
] & usedBufferMask
) {
468 /* can't specify a dest buffer more than once! */
469 _mesa_error(ctx
, GL_INVALID_OPERATION
,
470 "glDrawBuffersARB(duplicated buffer)");
475 usedBufferMask
|= destMask
[output
];
479 /* OK, if we get here, there were no errors so set the new state */
480 _mesa_drawbuffers(ctx
, n
, buffers
, destMask
);
483 * Call device driver function.
485 if (ctx
->Driver
.DrawBuffers
)
486 ctx
->Driver
.DrawBuffers(ctx
, n
, buffers
);
487 else if (ctx
->Driver
.DrawBuffer
)
488 ctx
->Driver
.DrawBuffer(ctx
, buffers
[0]);
493 * Helper function to set the GL_DRAW_BUFFER state in the context and
496 * All error checking will have been done prior to calling this function
497 * so nothing should go wrong at this point.
499 * \param ctx current context
500 * \param n number of color outputs to set
501 * \param buffers array[n] of colorbuffer names, like GL_LEFT.
502 * \param destMask array[n] of BUFFER_BIT_* bitmasks which correspond to the
503 * colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
504 * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
507 _mesa_drawbuffers(GLcontext
*ctx
, GLuint n
, const GLenum
*buffers
,
508 const GLbitfield
*destMask
)
510 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
511 GLbitfield mask
[MAX_DRAW_BUFFERS
];
514 /* compute destMask values now */
515 const GLbitfield supportedMask
= supported_buffer_bitmask(ctx
, fb
);
517 for (output
= 0; output
< n
; output
++) {
518 mask
[output
] = draw_buffer_enum_to_bitmask(buffers
[output
]);
519 ASSERT(mask
[output
] != BAD_MASK
);
520 mask
[output
] &= supportedMask
;
526 GLuint buf
, count
= 0;
527 /* init to -1 to help catch errors */
528 fb
->_ColorDrawBufferIndexes
[0] = -1;
529 for (buf
= 0; buf
< BUFFER_COUNT
; buf
++) {
530 if (destMask
[0] & (1 << buf
)) {
531 fb
->_ColorDrawBufferIndexes
[count
] = buf
;
535 fb
->ColorDrawBuffer
[0] = buffers
[0];
536 fb
->_NumColorDrawBuffers
= count
;
539 GLuint buf
, count
= 0;
540 for (buf
= 0; buf
< n
; buf
++ ) {
542 fb
->_ColorDrawBufferIndexes
[buf
] = _mesa_ffs(destMask
[buf
]) - 1;
543 fb
->ColorDrawBuffer
[buf
] = buffers
[buf
];
547 fb
->_ColorDrawBufferIndexes
[buf
] = -1;
550 /* set remaining outputs to -1 (GL_NONE) */
551 while (buf
< ctx
->Const
.MaxDrawBuffers
) {
552 fb
->_ColorDrawBufferIndexes
[buf
] = -1;
553 fb
->ColorDrawBuffer
[buf
] = GL_NONE
;
556 fb
->_NumColorDrawBuffers
= count
;
560 /* also set context drawbuffer state */
562 for (buf
= 0; buf
< ctx
->Const
.MaxDrawBuffers
; buf
++) {
563 ctx
->Color
.DrawBuffer
[buf
] = fb
->ColorDrawBuffer
[buf
];
567 ctx
->NewState
|= _NEW_COLOR
;
572 * Like \sa _mesa_drawbuffers(), this is a helper function for setting
573 * GL_READ_BUFFER state in the context and current FBO.
574 * \param ctx the rendering context
575 * \param buffer GL_FRONT, GL_BACK, GL_COLOR_ATTACHMENT0, etc.
576 * \param bufferIndex the numerical index corresponding to 'buffer'
579 _mesa_readbuffer(GLcontext
*ctx
, GLenum buffer
, GLint bufferIndex
)
581 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
584 /* Only update the per-context READ_BUFFER state if we're bound to
585 * a window-system framebuffer.
587 ctx
->Pixel
.ReadBuffer
= buffer
;
590 fb
->ColorReadBuffer
= buffer
;
591 fb
->_ColorReadBufferIndex
= bufferIndex
;
593 ctx
->NewState
|= _NEW_PIXEL
;
599 * Called by glReadBuffer to set the source renderbuffer for reading pixels.
600 * \param mode color buffer such as GL_FRONT, GL_BACK, etc.
603 _mesa_ReadBuffer(GLenum buffer
)
605 struct gl_framebuffer
*fb
;
606 GLbitfield supportedMask
;
608 GET_CURRENT_CONTEXT(ctx
);
609 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
611 if (MESA_VERBOSE
& VERBOSE_API
)
612 _mesa_debug(ctx
, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
614 fb
= ctx
->ReadBuffer
;
616 if (MESA_VERBOSE
& VERBOSE_API
)
617 _mesa_debug(ctx
, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
619 if (fb
->Name
> 0 && buffer
== GL_NONE
) {
620 /* This is legal for user-created framebuffer objects */
624 /* general case / window-system framebuffer */
625 srcBuffer
= read_buffer_enum_to_index(buffer
);
626 if (srcBuffer
== -1) {
627 _mesa_error(ctx
, GL_INVALID_ENUM
,
628 "glReadBuffer(buffer=0x%x)", buffer
);
631 supportedMask
= supported_buffer_bitmask(ctx
, fb
);
632 if (((1 << srcBuffer
) & supportedMask
) == 0) {
633 _mesa_error(ctx
, GL_INVALID_OPERATION
,
634 "glReadBuffer(buffer=0x%x)", buffer
);
639 /* OK, all error checking has been completed now */
641 _mesa_readbuffer(ctx
, buffer
, srcBuffer
);
644 * Call device driver function.
646 if (ctx
->Driver
.ReadBuffer
)
647 (*ctx
->Driver
.ReadBuffer
)(ctx
, buffer
);
654 * XXX THIS IS OBSOLETE - drivers should take care of detecting window
655 * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
657 * GL_MESA_resize_buffers extension.
659 * When this function is called, we'll ask the window system how large
660 * the current window is. If it's a new size, we'll call the driver's
661 * ResizeBuffers function. The driver will then resize its color buffers
662 * as needed, and maybe call the swrast's routine for reallocating
663 * swrast-managed depth/stencil/accum/etc buffers.
664 * \note This function should only be called through the GL API, not
665 * from device drivers (as was done in the past).
668 void _mesa_resizebuffers( GLcontext
*ctx
)
670 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
672 if (MESA_VERBOSE
& VERBOSE_API
)
673 _mesa_debug(ctx
, "glResizeBuffersMESA\n");
675 if (!ctx
->Driver
.GetBufferSize
) {
679 if (ctx
->WinSysDrawBuffer
) {
680 GLuint newWidth
, newHeight
;
681 GLframebuffer
*buffer
= ctx
->WinSysDrawBuffer
;
683 assert(buffer
->Name
== 0);
685 /* ask device driver for size of output buffer */
686 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
688 /* see if size of device driver's color buffer (window) has changed */
689 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
690 if (ctx
->Driver
.ResizeBuffers
)
691 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
695 if (ctx
->WinSysReadBuffer
696 && ctx
->WinSysReadBuffer
!= ctx
->WinSysDrawBuffer
) {
697 GLuint newWidth
, newHeight
;
698 GLframebuffer
*buffer
= ctx
->WinSysReadBuffer
;
700 assert(buffer
->Name
== 0);
702 /* ask device driver for size of read buffer */
703 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
705 /* see if size of device driver's color buffer (window) has changed */
706 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
707 if (ctx
->Driver
.ResizeBuffers
)
708 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
712 ctx
->NewState
|= _NEW_BUFFERS
; /* to update scissor / window bounds */
717 * XXX THIS IS OBSOLETE
720 _mesa_ResizeBuffersMESA( void )
722 GET_CURRENT_CONTEXT(ctx
);
724 if (ctx
->Extensions
.MESA_resize_buffers
)
725 _mesa_resizebuffers( ctx
);
730 * XXX move somewhere else someday?
733 _mesa_SampleCoverageARB(GLclampf value
, GLboolean invert
)
735 GET_CURRENT_CONTEXT(ctx
);
737 if (!ctx
->Extensions
.ARB_multisample
) {
738 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glSampleCoverageARB");
742 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
743 ctx
->Multisample
.SampleCoverageValue
= (GLfloat
) CLAMP(value
, 0.0, 1.0);
744 ctx
->Multisample
.SampleCoverageInvert
= invert
;
745 ctx
->NewState
|= _NEW_MULTISAMPLE
;
748 #endif /* _HAVE_FULL_GL */
753 * Define the scissor box.
755 * \param x, y coordinates of the scissor box lower-left corner.
756 * \param width width of the scissor box.
757 * \param height height of the scissor box.
761 * Verifies the parameters and updates __GLcontextRec::Scissor. On a
762 * change flushes the vertices and notifies the driver via
763 * the dd_function_table::Scissor callback.
766 _mesa_set_scissor(GLcontext
*ctx
,
767 GLint x
, GLint y
, GLsizei width
, GLsizei height
)
769 if (x
== ctx
->Scissor
.X
&&
770 y
== ctx
->Scissor
.Y
&&
771 width
== ctx
->Scissor
.Width
&&
772 height
== ctx
->Scissor
.Height
)
775 FLUSH_VERTICES(ctx
, _NEW_SCISSOR
);
778 ctx
->Scissor
.Width
= width
;
779 ctx
->Scissor
.Height
= height
;
781 if (ctx
->Driver
.Scissor
)
782 ctx
->Driver
.Scissor( ctx
, x
, y
, width
, height
);
787 _mesa_Scissor( GLint x
, GLint y
, GLsizei width
, GLsizei height
)
789 GET_CURRENT_CONTEXT(ctx
);
790 ASSERT_OUTSIDE_BEGIN_END(ctx
);
792 if (width
< 0 || height
< 0) {
793 _mesa_error( ctx
, GL_INVALID_VALUE
, "glScissor" );
797 if (MESA_VERBOSE
& VERBOSE_API
)
798 _mesa_debug(ctx
, "glScissor %d %d %d %d\n", x
, y
, width
, height
);
800 _mesa_set_scissor(ctx
, x
, y
, width
, height
);
805 /**********************************************************************/
806 /** \name Initialization */
810 * Initialize the context's scissor state.
811 * \param ctx the GL context.
814 _mesa_init_scissor(GLcontext
*ctx
)
817 ctx
->Scissor
.Enabled
= GL_FALSE
;
820 ctx
->Scissor
.Width
= 0;
821 ctx
->Scissor
.Height
= 0;
826 * Initialize the context's multisample state.
827 * \param ctx the GL context.
830 _mesa_init_multisample(GLcontext
*ctx
)
832 ctx
->Multisample
.Enabled
= GL_FALSE
;
833 ctx
->Multisample
.SampleAlphaToCoverage
= GL_FALSE
;
834 ctx
->Multisample
.SampleAlphaToOne
= GL_FALSE
;
835 ctx
->Multisample
.SampleCoverage
= GL_FALSE
;
836 ctx
->Multisample
.SampleCoverageValue
= 1.0;
837 ctx
->Multisample
.SampleCoverageInvert
= GL_FALSE
;