2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2006 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
->RenderMode
== GL_RENDER
) {
144 GLbitfield bufferMask
;
146 /* don't clear depth buffer if depth writing disabled */
147 if (!ctx
->Depth
.Mask
)
148 mask
&= ~GL_DEPTH_BUFFER_BIT
;
150 /* Build the bitmask to send to device driver's Clear function.
151 * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
152 * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
153 * BUFFER_BIT_COLORn flags.
156 if (mask
& GL_COLOR_BUFFER_BIT
) {
157 bufferMask
|= ctx
->DrawBuffer
->_ColorDrawBufferMask
[0];
160 if ((mask
& GL_DEPTH_BUFFER_BIT
)
161 && ctx
->DrawBuffer
->Visual
.haveDepthBuffer
) {
162 bufferMask
|= BUFFER_BIT_DEPTH
;
165 if ((mask
& GL_STENCIL_BUFFER_BIT
)
166 && ctx
->DrawBuffer
->Visual
.haveStencilBuffer
) {
167 bufferMask
|= BUFFER_BIT_STENCIL
;
170 if ((mask
& GL_ACCUM_BUFFER_BIT
)
171 && ctx
->DrawBuffer
->Visual
.haveAccumBuffer
) {
172 bufferMask
|= BUFFER_BIT_ACCUM
;
175 ASSERT(ctx
->Driver
.Clear
);
176 ctx
->Driver
.Clear(ctx
, bufferMask
);
183 * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
184 * available to the rendering context.
185 * This depends on the framebuffer we're writing to. For window system
186 * framebuffers we look at the framebuffer's visual. But for user-
187 * create framebuffers we look at the number of supported color attachments.
190 supported_buffer_bitmask(const GLcontext
*ctx
, GLuint framebufferID
)
192 GLbitfield mask
= 0x0;
194 if (framebufferID
> 0) {
195 /* A user-created renderbuffer */
197 ASSERT(ctx
->Extensions
.EXT_framebuffer_object
);
198 for (i
= 0; i
< ctx
->Const
.MaxColorAttachments
; i
++) {
199 mask
|= (BUFFER_BIT_COLOR0
<< i
);
203 /* A window system renderbuffer */
205 mask
= BUFFER_BIT_FRONT_LEFT
; /* always have this */
206 if (ctx
->Visual
.stereoMode
) {
207 mask
|= BUFFER_BIT_FRONT_RIGHT
;
208 if (ctx
->Visual
.doubleBufferMode
) {
209 mask
|= BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
212 else if (ctx
->Visual
.doubleBufferMode
) {
213 mask
|= BUFFER_BIT_BACK_LEFT
;
216 for (i
= 0; i
< ctx
->Visual
.numAuxBuffers
; i
++) {
217 mask
|= (BUFFER_BIT_AUX0
<< i
);
226 * Helper routine used by glDrawBuffer and glDrawBuffersARB.
227 * Given a GLenum naming one or more color buffers (such as
228 * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
231 draw_buffer_enum_to_bitmask(GLenum buffer
)
237 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_FRONT_RIGHT
;
239 return BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
241 return BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
243 return BUFFER_BIT_FRONT_RIGHT
;
245 return BUFFER_BIT_BACK_RIGHT
;
247 return BUFFER_BIT_BACK_LEFT
;
248 case GL_FRONT_AND_BACK
:
249 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
250 | BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
252 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
;
254 return BUFFER_BIT_FRONT_LEFT
;
256 return BUFFER_BIT_AUX0
;
258 return BUFFER_BIT_AUX1
;
260 return BUFFER_BIT_AUX2
;
262 return BUFFER_BIT_AUX3
;
263 case GL_COLOR_ATTACHMENT0_EXT
:
264 return BUFFER_BIT_COLOR0
;
265 case GL_COLOR_ATTACHMENT1_EXT
:
266 return BUFFER_BIT_COLOR1
;
267 case GL_COLOR_ATTACHMENT2_EXT
:
268 return BUFFER_BIT_COLOR2
;
269 case GL_COLOR_ATTACHMENT3_EXT
:
270 return BUFFER_BIT_COLOR3
;
279 * Helper routine used by glReadBuffer.
280 * Given a GLenum naming a color buffer, return the index of the corresponding
281 * renderbuffer (a BUFFER_* value).
282 * return -1 for an invalid buffer.
285 read_buffer_enum_to_index(GLenum buffer
)
289 return BUFFER_FRONT_LEFT
;
291 return BUFFER_BACK_LEFT
;
293 return BUFFER_FRONT_RIGHT
;
295 return BUFFER_FRONT_RIGHT
;
297 return BUFFER_BACK_RIGHT
;
299 return BUFFER_BACK_LEFT
;
301 return BUFFER_FRONT_LEFT
;
303 return BUFFER_FRONT_LEFT
;
312 case GL_COLOR_ATTACHMENT0_EXT
:
313 return BUFFER_COLOR0
;
314 case GL_COLOR_ATTACHMENT1_EXT
:
315 return BUFFER_COLOR1
;
316 case GL_COLOR_ATTACHMENT2_EXT
:
317 return BUFFER_COLOR2
;
318 case GL_COLOR_ATTACHMENT3_EXT
:
319 return BUFFER_COLOR3
;
328 * Called by glDrawBuffer().
329 * Specify which renderbuffer(s) to draw into for the first color output.
330 * <buffer> can name zero, one, two or four renderbuffers!
331 * \sa _mesa_DrawBuffersARB
333 * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
336 _mesa_DrawBuffer(GLenum buffer
)
340 GET_CURRENT_CONTEXT(ctx
);
341 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
); /* too complex... */
343 if (MESA_VERBOSE
& VERBOSE_API
) {
344 _mesa_debug(ctx
, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
347 bufferID
= ctx
->DrawBuffer
->Name
;
349 if (buffer
== GL_NONE
) {
353 const GLbitfield supportedMask
= supported_buffer_bitmask(ctx
, bufferID
);
354 destMask
= draw_buffer_enum_to_bitmask(buffer
);
355 if (destMask
== BAD_MASK
) {
356 /* totally bogus buffer */
357 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawBuffer(buffer)");
360 destMask
&= supportedMask
;
361 if (destMask
== 0x0) {
362 /* none of the named color buffers exist! */
363 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffer(buffer)");
368 /* if we get here, there's no error so set new state */
369 _mesa_drawbuffers(ctx
, 1, &buffer
, &destMask
);
374 * Called by glDrawBuffersARB; specifies the destination color renderbuffers
375 * for N fragment program color outputs.
376 * \sa _mesa_DrawBuffer
377 * \param n number of outputs
378 * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
379 * names cannot specify more than one buffer. For example,
380 * GL_FRONT_AND_BACK is illegal.
383 _mesa_DrawBuffersARB(GLsizei n
, const GLenum
*buffers
)
387 GLbitfield usedBufferMask
, supportedMask
;
388 GLbitfield destMask
[MAX_DRAW_BUFFERS
];
389 GET_CURRENT_CONTEXT(ctx
);
390 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
392 if (!ctx
->Extensions
.ARB_draw_buffers
) {
393 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffersARB");
396 if (n
< 1 || n
> (GLsizei
) ctx
->Const
.MaxDrawBuffers
) {
397 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawBuffersARB(n)");
401 bufferID
= ctx
->DrawBuffer
->Name
;
403 supportedMask
= supported_buffer_bitmask(ctx
, bufferID
);
404 usedBufferMask
= 0x0;
406 /* complicated error checking... */
407 for (output
= 0; output
< n
; output
++) {
408 if (buffers
[output
] == GL_NONE
) {
409 destMask
[output
] = 0x0;
412 destMask
[output
] = draw_buffer_enum_to_bitmask(buffers
[output
]);
413 if (destMask
[output
] == BAD_MASK
414 || _mesa_bitcount(destMask
[output
]) > 1) {
415 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawBuffersARB(buffer)");
418 destMask
[output
] &= supportedMask
;
419 if (destMask
[output
] == 0) {
420 _mesa_error(ctx
, GL_INVALID_OPERATION
,
421 "glDrawBuffersARB(unsupported buffer)");
424 if (destMask
[output
] & usedBufferMask
) {
425 /* can't specify a dest buffer more than once! */
426 _mesa_error(ctx
, GL_INVALID_OPERATION
,
427 "glDrawBuffersARB(duplicated buffer)");
432 usedBufferMask
|= destMask
[output
];
436 /* OK, if we get here, there were no errors so set the new state */
437 _mesa_drawbuffers(ctx
, n
, buffers
, destMask
);
442 * Set color output state. Traditionally, there was only one color
443 * output, but fragment programs can now have several distinct color
444 * outputs (see GL_ARB_draw_buffers). This function sets the state
445 * for one such color output.
446 * \param ctx current context
447 * \param output which fragment program output
448 * \param buffer buffer to write to (like GL_LEFT)
449 * \param destMask BUFFER_* bitmask
450 * (like BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
453 set_color_output(GLcontext
*ctx
, GLuint output
, GLenum buffer
,
456 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
458 ASSERT(output
< ctx
->Const
.MaxDrawBuffers
);
460 /* Set per-FBO state */
461 fb
->ColorDrawBuffer
[output
] = buffer
;
462 fb
->_ColorDrawBufferMask
[output
] = destMask
;
463 /* not really needed, will be set later */
464 fb
->_NumColorDrawBuffers
[output
] = 0;
466 /* Set traditional state var */
467 ctx
->Color
.DrawBuffer
[output
] = buffer
;
472 * Helper routine used by _mesa_DrawBuffer, _mesa_DrawBuffersARB and
473 * _mesa_PopAttrib to set drawbuffer state.
474 * All error checking will have been done prior to calling this function
475 * so nothing should go wrong at this point.
476 * \param ctx current context
477 * \param n number of color outputs to set
478 * \param buffers array[n] of colorbuffer names, like GL_LEFT.
479 * \param destMask array[n] of BUFFER_* bitmasks which correspond to the
480 * colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
481 * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
484 _mesa_drawbuffers(GLcontext
*ctx
, GLuint n
, const GLenum
*buffers
,
485 const GLbitfield
*destMask
)
487 GLbitfield mask
[MAX_DRAW_BUFFERS
];
491 /* compute destMask values now */
492 const GLuint bufferID
= ctx
->DrawBuffer
->Name
;
493 const GLbitfield supportedMask
= supported_buffer_bitmask(ctx
, bufferID
);
494 for (output
= 0; output
< n
; output
++) {
495 mask
[output
] = draw_buffer_enum_to_bitmask(buffers
[output
]);
496 ASSERT(mask
[output
] != BAD_MASK
);
497 mask
[output
] &= supportedMask
;
502 for (output
= 0; output
< n
; output
++) {
503 set_color_output(ctx
, output
, buffers
[output
], destMask
[output
]);
506 /* set remaining color outputs to NONE */
507 for (output
= n
; output
< ctx
->Const
.MaxDrawBuffers
; output
++) {
508 set_color_output(ctx
, output
, GL_NONE
, 0x0);
511 ctx
->NewState
|= _NEW_COLOR
;
514 * Call device driver function.
516 if (ctx
->Driver
.DrawBuffers
)
517 ctx
->Driver
.DrawBuffers(ctx
, n
, buffers
);
518 else if (ctx
->Driver
.DrawBuffer
)
519 ctx
->Driver
.DrawBuffer(ctx
, buffers
[0]);
525 * Called by glReadBuffer to set the source renderbuffer for reading pixels.
526 * \param mode color buffer such as GL_FRONT, GL_BACK, etc.
529 _mesa_ReadBuffer(GLenum buffer
)
531 struct gl_framebuffer
*fb
;
532 GLbitfield supportedMask
;
535 GET_CURRENT_CONTEXT(ctx
);
536 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
538 fb
= ctx
->ReadBuffer
;
541 if (MESA_VERBOSE
& VERBOSE_API
)
542 _mesa_debug(ctx
, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
544 if (bufferID
> 0 && buffer
== GL_NONE
) {
545 /* This is legal for user-created framebuffer objects */
549 /* general case / window-system framebuffer */
550 srcBuffer
= read_buffer_enum_to_index(buffer
);
551 if (srcBuffer
== -1) {
552 _mesa_error(ctx
, GL_INVALID_ENUM
, "glReadBuffer(buffer=0x%x)", buffer
);
555 supportedMask
= supported_buffer_bitmask(ctx
, bufferID
);
556 if (((1 << srcBuffer
) & supportedMask
) == 0) {
557 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadBuffer(buffer=0x%x)", buffer
);
563 ctx
->Pixel
.ReadBuffer
= buffer
;
565 fb
->ColorReadBuffer
= buffer
;
566 fb
->_ColorReadBufferIndex
= srcBuffer
;
568 ctx
->NewState
|= _NEW_PIXEL
;
571 * Call device driver function.
573 if (ctx
->Driver
.ReadBuffer
)
574 (*ctx
->Driver
.ReadBuffer
)(ctx
, buffer
);
581 * XXX THIS IS OBSOLETE - drivers should take care of detecting window
582 * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
584 * GL_MESA_resize_buffers extension.
586 * When this function is called, we'll ask the window system how large
587 * the current window is. If it's a new size, we'll call the driver's
588 * ResizeBuffers function. The driver will then resize its color buffers
589 * as needed, and maybe call the swrast's routine for reallocating
590 * swrast-managed depth/stencil/accum/etc buffers.
591 * \note This function should only be called through the GL API, not
592 * from device drivers (as was done in the past).
595 void _mesa_resizebuffers( GLcontext
*ctx
)
597 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
599 if (MESA_VERBOSE
& VERBOSE_API
)
600 _mesa_debug(ctx
, "glResizeBuffersMESA\n");
602 if (!ctx
->Driver
.GetBufferSize
) {
606 if (ctx
->WinSysDrawBuffer
) {
607 GLuint newWidth
, newHeight
;
608 GLframebuffer
*buffer
= ctx
->WinSysDrawBuffer
;
610 assert(buffer
->Name
== 0);
612 /* ask device driver for size of output buffer */
613 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
615 /* see if size of device driver's color buffer (window) has changed */
616 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
617 if (ctx
->Driver
.ResizeBuffers
)
618 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
622 if (ctx
->WinSysReadBuffer
623 && ctx
->WinSysReadBuffer
!= ctx
->WinSysDrawBuffer
) {
624 GLuint newWidth
, newHeight
;
625 GLframebuffer
*buffer
= ctx
->WinSysReadBuffer
;
627 assert(buffer
->Name
== 0);
629 /* ask device driver for size of read buffer */
630 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
632 /* see if size of device driver's color buffer (window) has changed */
633 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
634 if (ctx
->Driver
.ResizeBuffers
)
635 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
639 ctx
->NewState
|= _NEW_BUFFERS
; /* to update scissor / window bounds */
644 * XXX THIS IS OBSOLETE
647 _mesa_ResizeBuffersMESA( void )
649 GET_CURRENT_CONTEXT(ctx
);
651 _mesa_resizebuffers( ctx
);
656 * XXX move somewhere else someday?
659 _mesa_SampleCoverageARB(GLclampf value
, GLboolean invert
)
661 GET_CURRENT_CONTEXT(ctx
);
663 if (!ctx
->Extensions
.ARB_multisample
) {
664 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glSampleCoverageARB");
668 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
669 ctx
->Multisample
.SampleCoverageValue
= (GLfloat
) CLAMP(value
, 0.0, 1.0);
670 ctx
->Multisample
.SampleCoverageInvert
= invert
;
671 ctx
->NewState
|= _NEW_MULTISAMPLE
;
674 #endif /* _HAVE_FULL_GL */
679 * Define the scissor box.
681 * \param x, y coordinates of the scissor box lower-left corner.
682 * \param width width of the scissor box.
683 * \param height height of the scissor box.
687 * Verifies the parameters and updates __GLcontextRec::Scissor. On a
688 * change flushes the vertices and notifies the driver via
689 * the dd_function_table::Scissor callback.
692 _mesa_set_scissor(GLcontext
*ctx
,
693 GLint x
, GLint y
, GLsizei width
, GLsizei height
)
695 if (x
== ctx
->Scissor
.X
&&
696 y
== ctx
->Scissor
.Y
&&
697 width
== ctx
->Scissor
.Width
&&
698 height
== ctx
->Scissor
.Height
)
701 FLUSH_VERTICES(ctx
, _NEW_SCISSOR
);
704 ctx
->Scissor
.Width
= width
;
705 ctx
->Scissor
.Height
= height
;
707 if (ctx
->Driver
.Scissor
)
708 ctx
->Driver
.Scissor( ctx
, x
, y
, width
, height
);
713 _mesa_Scissor( GLint x
, GLint y
, GLsizei width
, GLsizei height
)
715 GET_CURRENT_CONTEXT(ctx
);
716 ASSERT_OUTSIDE_BEGIN_END(ctx
);
718 if (width
< 0 || height
< 0) {
719 _mesa_error( ctx
, GL_INVALID_VALUE
, "glScissor" );
723 if (MESA_VERBOSE
& VERBOSE_API
)
724 _mesa_debug(ctx
, "glScissor %d %d %d %d\n", x
, y
, width
, height
);
726 _mesa_set_scissor(ctx
, x
, y
, width
, height
);
731 /**********************************************************************/
732 /** \name Initialization */
736 * Initialize the context's scissor state.
737 * \param ctx the GL context.
740 _mesa_init_scissor(GLcontext
*ctx
)
743 ctx
->Scissor
.Enabled
= GL_FALSE
;
746 ctx
->Scissor
.Width
= 0;
747 ctx
->Scissor
.Height
= 0;
752 * Initialize the context's multisample state.
753 * \param ctx the GL context.
756 _mesa_init_multisample(GLcontext
*ctx
)
758 ctx
->Multisample
.Enabled
= GL_FALSE
;
759 ctx
->Multisample
.SampleAlphaToCoverage
= GL_FALSE
;
760 ctx
->Multisample
.SampleAlphaToOne
= GL_FALSE
;
761 ctx
->Multisample
.SampleCoverage
= GL_FALSE
;
762 ctx
->Multisample
.SampleCoverageValue
= 1.0;
763 ctx
->Multisample
.SampleCoverageInvert
= GL_FALSE
;