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.
41 #include "state_tracker/st_draw.h"
49 _mesa_ClearIndex( GLfloat c
)
51 GET_CURRENT_CONTEXT(ctx
);
52 ASSERT_OUTSIDE_BEGIN_END(ctx
);
54 if (ctx
->Color
.ClearIndex
== (GLuint
) c
)
57 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
58 ctx
->Color
.ClearIndex
= (GLuint
) c
;
60 if (!ctx
->Visual
.rgbMode
&& ctx
->Driver
.ClearIndex
) {
61 /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
62 (*ctx
->Driver
.ClearIndex
)( ctx
, ctx
->Color
.ClearIndex
);
69 * Specify the clear values for the color buffers.
71 * \param red red color component.
72 * \param green green color component.
73 * \param blue blue color component.
74 * \param alpha alpha component.
78 * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
79 * change, flushes the vertices and notifies the driver via the
80 * dd_function_table::ClearColor callback.
83 _mesa_ClearColor( GLclampf red
, GLclampf green
, GLclampf blue
, GLclampf alpha
)
86 GET_CURRENT_CONTEXT(ctx
);
87 ASSERT_OUTSIDE_BEGIN_END(ctx
);
89 tmp
[0] = CLAMP(red
, 0.0F
, 1.0F
);
90 tmp
[1] = CLAMP(green
, 0.0F
, 1.0F
);
91 tmp
[2] = CLAMP(blue
, 0.0F
, 1.0F
);
92 tmp
[3] = CLAMP(alpha
, 0.0F
, 1.0F
);
94 if (TEST_EQ_4V(tmp
, ctx
->Color
.ClearColor
))
95 return; /* no change */
97 FLUSH_VERTICES(ctx
, _NEW_COLOR
);
98 COPY_4V(ctx
->Color
.ClearColor
, tmp
);
100 if (ctx
->Visual
.rgbMode
&& ctx
->Driver
.ClearColor
) {
101 /* it's OK to call glClearColor in CI mode but it should be a NOP */
102 (*ctx
->Driver
.ClearColor
)(ctx
, ctx
->Color
.ClearColor
);
110 * \param mask bit-mask indicating the buffers to be cleared.
112 * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
113 * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
114 * etc. If the rasterization mode is set to GL_RENDER then requests the driver
115 * to clear the buffers, via the dd_function_table::Clear callback.
118 _mesa_Clear( GLbitfield mask
)
120 GET_CURRENT_CONTEXT(ctx
);
121 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
123 if (MESA_VERBOSE
& VERBOSE_API
)
124 _mesa_debug(ctx
, "glClear 0x%x\n", mask
);
126 if (mask
& ~(GL_COLOR_BUFFER_BIT
|
127 GL_DEPTH_BUFFER_BIT
|
128 GL_STENCIL_BUFFER_BIT
|
129 GL_ACCUM_BUFFER_BIT
)) {
130 /* invalid bit set */
131 _mesa_error( ctx
, GL_INVALID_VALUE
, "glClear(0x%x)", mask
);
136 _mesa_update_state( ctx
); /* update _Xmin, etc */
139 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
140 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
141 "glClear(incomplete framebuffer)");
145 if (ctx
->DrawBuffer
->Width
== 0 || ctx
->DrawBuffer
->Height
== 0)
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
) {
162 bufferMask
|= ctx
->DrawBuffer
->_ColorDrawBufferMask
[0];
165 if ((mask
& GL_DEPTH_BUFFER_BIT
)
166 && ctx
->DrawBuffer
->Visual
.haveDepthBuffer
) {
167 bufferMask
|= BUFFER_BIT_DEPTH
;
170 if ((mask
& GL_STENCIL_BUFFER_BIT
)
171 && ctx
->DrawBuffer
->Visual
.haveStencilBuffer
) {
172 bufferMask
|= BUFFER_BIT_STENCIL
;
175 if ((mask
& GL_ACCUM_BUFFER_BIT
)
176 && ctx
->DrawBuffer
->Visual
.haveAccumBuffer
) {
177 bufferMask
|= BUFFER_BIT_ACCUM
;
180 ASSERT(ctx
->Driver
.Clear
);
182 ctx
->Driver
.Clear(ctx
, bufferMask
);
185 (mask
& GL_COLOR_BUFFER_BIT
) ? GL_TRUE
: GL_FALSE
,
186 (bufferMask
& BUFFER_BIT_DEPTH
) ? GL_TRUE
: GL_FALSE
,
187 (bufferMask
& BUFFER_BIT_STENCIL
) ? GL_TRUE
: GL_FALSE
,
188 (bufferMask
& BUFFER_BIT_ACCUM
) ? GL_TRUE
: GL_FALSE
);
196 * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
197 * available to the rendering context (for drawing or reading).
198 * This depends on the type of framebuffer. For window system framebuffers
199 * we look at the framebuffer's visual. But for user-create framebuffers we
200 * look at the number of supported color attachments.
201 * \param fb the framebuffer to draw to, or read from
202 * \return bitmask of BUFFER_BIT_* flags
205 supported_buffer_bitmask(const GLcontext
*ctx
, const struct gl_framebuffer
*fb
)
207 GLbitfield mask
= 0x0;
210 /* A user-created renderbuffer */
212 ASSERT(ctx
->Extensions
.EXT_framebuffer_object
);
213 for (i
= 0; i
< ctx
->Const
.MaxColorAttachments
; i
++) {
214 mask
|= (BUFFER_BIT_COLOR0
<< i
);
218 /* A window system framebuffer */
220 mask
= BUFFER_BIT_FRONT_LEFT
; /* always have this */
221 if (fb
->Visual
.stereoMode
) {
222 mask
|= BUFFER_BIT_FRONT_RIGHT
;
223 if (fb
->Visual
.doubleBufferMode
) {
224 mask
|= BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
227 else if (fb
->Visual
.doubleBufferMode
) {
228 mask
|= BUFFER_BIT_BACK_LEFT
;
231 for (i
= 0; i
< fb
->Visual
.numAuxBuffers
; i
++) {
232 mask
|= (BUFFER_BIT_AUX0
<< i
);
241 * Helper routine used by glDrawBuffer and glDrawBuffersARB.
242 * Given a GLenum naming one or more color buffers (such as
243 * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
246 draw_buffer_enum_to_bitmask(GLenum buffer
)
252 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_FRONT_RIGHT
;
254 return BUFFER_BIT_BACK_LEFT
| BUFFER_BIT_BACK_RIGHT
;
256 return BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
258 return BUFFER_BIT_FRONT_RIGHT
;
260 return BUFFER_BIT_BACK_RIGHT
;
262 return BUFFER_BIT_BACK_LEFT
;
263 case GL_FRONT_AND_BACK
:
264 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
265 | BUFFER_BIT_FRONT_RIGHT
| BUFFER_BIT_BACK_RIGHT
;
267 return BUFFER_BIT_FRONT_LEFT
| BUFFER_BIT_BACK_LEFT
;
269 return BUFFER_BIT_FRONT_LEFT
;
271 return BUFFER_BIT_AUX0
;
273 return BUFFER_BIT_AUX1
;
275 return BUFFER_BIT_AUX2
;
277 return BUFFER_BIT_AUX3
;
278 case GL_COLOR_ATTACHMENT0_EXT
:
279 return BUFFER_BIT_COLOR0
;
280 case GL_COLOR_ATTACHMENT1_EXT
:
281 return BUFFER_BIT_COLOR1
;
282 case GL_COLOR_ATTACHMENT2_EXT
:
283 return BUFFER_BIT_COLOR2
;
284 case GL_COLOR_ATTACHMENT3_EXT
:
285 return BUFFER_BIT_COLOR3
;
294 * Helper routine used by glReadBuffer.
295 * Given a GLenum naming a color buffer, return the index of the corresponding
296 * renderbuffer (a BUFFER_* value).
297 * return -1 for an invalid buffer.
300 read_buffer_enum_to_index(GLenum buffer
)
304 return BUFFER_FRONT_LEFT
;
306 return BUFFER_BACK_LEFT
;
308 return BUFFER_FRONT_RIGHT
;
310 return BUFFER_FRONT_RIGHT
;
312 return BUFFER_BACK_RIGHT
;
314 return BUFFER_BACK_LEFT
;
316 return BUFFER_FRONT_LEFT
;
318 return BUFFER_FRONT_LEFT
;
327 case GL_COLOR_ATTACHMENT0_EXT
:
328 return BUFFER_COLOR0
;
329 case GL_COLOR_ATTACHMENT1_EXT
:
330 return BUFFER_COLOR1
;
331 case GL_COLOR_ATTACHMENT2_EXT
:
332 return BUFFER_COLOR2
;
333 case GL_COLOR_ATTACHMENT3_EXT
:
334 return BUFFER_COLOR3
;
343 * Called by glDrawBuffer().
344 * Specify which renderbuffer(s) to draw into for the first color output.
345 * <buffer> can name zero, one, two or four renderbuffers!
346 * \sa _mesa_DrawBuffersARB
348 * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
351 _mesa_DrawBuffer(GLenum buffer
)
354 GET_CURRENT_CONTEXT(ctx
);
355 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
); /* too complex... */
357 if (MESA_VERBOSE
& VERBOSE_API
) {
358 _mesa_debug(ctx
, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
361 if (buffer
== GL_NONE
) {
365 const GLbitfield supportedMask
366 = supported_buffer_bitmask(ctx
, ctx
->DrawBuffer
);
367 destMask
= draw_buffer_enum_to_bitmask(buffer
);
368 if (destMask
== BAD_MASK
) {
369 /* totally bogus buffer */
370 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawBuffer(buffer)");
373 destMask
&= supportedMask
;
374 if (destMask
== 0x0) {
375 /* none of the named color buffers exist! */
376 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffer(buffer)");
381 /* if we get here, there's no error so set new state */
382 _mesa_drawbuffers(ctx
, 1, &buffer
, &destMask
);
385 * Call device driver function.
387 if (ctx
->Driver
.DrawBuffers
)
388 ctx
->Driver
.DrawBuffers(ctx
, 1, &buffer
);
389 else if (ctx
->Driver
.DrawBuffer
)
390 ctx
->Driver
.DrawBuffer(ctx
, buffer
);
395 * Called by glDrawBuffersARB; specifies the destination color renderbuffers
396 * for N fragment program color outputs.
397 * \sa _mesa_DrawBuffer
398 * \param n number of outputs
399 * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
400 * names cannot specify more than one buffer. For example,
401 * GL_FRONT_AND_BACK is illegal.
404 _mesa_DrawBuffersARB(GLsizei n
, const GLenum
*buffers
)
407 GLbitfield usedBufferMask
, supportedMask
;
408 GLbitfield destMask
[MAX_DRAW_BUFFERS
];
409 GET_CURRENT_CONTEXT(ctx
);
410 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
412 if (!ctx
->Extensions
.ARB_draw_buffers
) {
413 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glDrawBuffersARB");
416 if (n
< 1 || n
> (GLsizei
) ctx
->Const
.MaxDrawBuffers
) {
417 _mesa_error(ctx
, GL_INVALID_VALUE
, "glDrawBuffersARB(n)");
421 supportedMask
= supported_buffer_bitmask(ctx
, ctx
->DrawBuffer
);
422 usedBufferMask
= 0x0;
424 /* complicated error checking... */
425 for (output
= 0; output
< n
; output
++) {
426 if (buffers
[output
] == GL_NONE
) {
427 destMask
[output
] = 0x0;
430 destMask
[output
] = draw_buffer_enum_to_bitmask(buffers
[output
]);
431 if (destMask
[output
] == BAD_MASK
432 || _mesa_bitcount(destMask
[output
]) > 1) {
433 _mesa_error(ctx
, GL_INVALID_ENUM
, "glDrawBuffersARB(buffer)");
436 destMask
[output
] &= supportedMask
;
437 if (destMask
[output
] == 0) {
438 _mesa_error(ctx
, GL_INVALID_OPERATION
,
439 "glDrawBuffersARB(unsupported buffer)");
442 if (destMask
[output
] & usedBufferMask
) {
443 /* can't specify a dest buffer more than once! */
444 _mesa_error(ctx
, GL_INVALID_OPERATION
,
445 "glDrawBuffersARB(duplicated buffer)");
450 usedBufferMask
|= destMask
[output
];
454 /* OK, if we get here, there were no errors so set the new state */
455 _mesa_drawbuffers(ctx
, n
, buffers
, destMask
);
458 * Call device driver function.
460 if (ctx
->Driver
.DrawBuffers
)
461 ctx
->Driver
.DrawBuffers(ctx
, n
, buffers
);
462 else if (ctx
->Driver
.DrawBuffer
)
463 ctx
->Driver
.DrawBuffer(ctx
, buffers
[0]);
468 * Set color output state. Traditionally, there was only one color
469 * output, but fragment programs can now have several distinct color
470 * outputs (see GL_ARB_draw_buffers). This function sets the state
471 * for one such color output.
472 * \param ctx current context
473 * \param output which fragment program output
474 * \param buffer buffer to write to (like GL_LEFT)
475 * \param destMask BUFFER_* bitmask
476 * (like BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
479 set_color_output(GLcontext
*ctx
, GLuint output
, GLenum buffer
,
482 struct gl_framebuffer
*fb
= ctx
->DrawBuffer
;
484 ASSERT(output
< ctx
->Const
.MaxDrawBuffers
);
486 /* Set per-FBO state */
487 fb
->ColorDrawBuffer
[output
] = buffer
;
488 fb
->_ColorDrawBufferMask
[output
] = destMask
;
489 /* not really needed, will be set later */
490 fb
->_NumColorDrawBuffers
[output
] = 0;
493 /* Set traditional state var */
494 ctx
->Color
.DrawBuffer
[output
] = buffer
;
499 * Helper routine used by _mesa_DrawBuffer, _mesa_DrawBuffersARB and
500 * other places (window fbo fixup) to set fbo (and the old ctx) fields.
501 * All error checking will have been done prior to calling this function
502 * so nothing should go wrong at this point.
503 * \param ctx current context
504 * \param n number of color outputs to set
505 * \param buffers array[n] of colorbuffer names, like GL_LEFT.
506 * \param destMask array[n] of BUFFER_* bitmasks which correspond to the
507 * colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
508 * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
511 _mesa_drawbuffers(GLcontext
*ctx
, GLuint n
, const GLenum
*buffers
,
512 const GLbitfield
*destMask
)
514 GLbitfield mask
[MAX_DRAW_BUFFERS
];
518 /* compute destMask values now */
519 const GLbitfield supportedMask
520 = supported_buffer_bitmask(ctx
, ctx
->DrawBuffer
);
521 for (output
= 0; output
< n
; output
++) {
522 mask
[output
] = draw_buffer_enum_to_bitmask(buffers
[output
]);
523 ASSERT(mask
[output
] != BAD_MASK
);
524 mask
[output
] &= supportedMask
;
529 for (output
= 0; output
< n
; output
++) {
530 set_color_output(ctx
, output
, buffers
[output
], destMask
[output
]);
533 /* set remaining color outputs to NONE */
534 for (output
= n
; output
< ctx
->Const
.MaxDrawBuffers
; output
++) {
535 set_color_output(ctx
, output
, GL_NONE
, 0x0);
538 ctx
->NewState
|= _NEW_COLOR
;
543 _mesa_readbuffer_update_fields(GLcontext
*ctx
, GLenum buffer
)
545 struct gl_framebuffer
*fb
;
546 GLbitfield supportedMask
;
549 fb
= ctx
->ReadBuffer
;
551 if (MESA_VERBOSE
& VERBOSE_API
)
552 _mesa_debug(ctx
, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
554 if (fb
->Name
> 0 && buffer
== GL_NONE
) {
555 /* This is legal for user-created framebuffer objects */
559 /* general case / window-system framebuffer */
560 srcBuffer
= read_buffer_enum_to_index(buffer
);
561 if (srcBuffer
== -1) {
562 _mesa_error(ctx
, GL_INVALID_ENUM
, "glReadBuffer(buffer=0x%x)", buffer
);
565 supportedMask
= supported_buffer_bitmask(ctx
, fb
);
566 if (((1 << srcBuffer
) & supportedMask
) == 0) {
567 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadBuffer(buffer=0x%x)", buffer
);
573 ctx
->Pixel
.ReadBuffer
= buffer
;
575 fb
->ColorReadBuffer
= buffer
;
576 fb
->_ColorReadBufferIndex
= srcBuffer
;
584 * Called by glReadBuffer to set the source renderbuffer for reading pixels.
585 * \param mode color buffer such as GL_FRONT, GL_BACK, etc.
588 _mesa_ReadBuffer(GLenum buffer
)
590 GET_CURRENT_CONTEXT(ctx
);
591 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
593 if (MESA_VERBOSE
& VERBOSE_API
)
594 _mesa_debug(ctx
, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer
));
596 if (!_mesa_readbuffer_update_fields(ctx
, buffer
))
599 ctx
->NewState
|= _NEW_PIXEL
;
602 * Call device driver function.
604 if (ctx
->Driver
.ReadBuffer
)
605 (*ctx
->Driver
.ReadBuffer
)(ctx
, buffer
);
612 * XXX THIS IS OBSOLETE - drivers should take care of detecting window
613 * size changes and act accordingly, likely calling _mesa_resize_framebuffer().
615 * GL_MESA_resize_buffers extension.
617 * When this function is called, we'll ask the window system how large
618 * the current window is. If it's a new size, we'll call the driver's
619 * ResizeBuffers function. The driver will then resize its color buffers
620 * as needed, and maybe call the swrast's routine for reallocating
621 * swrast-managed depth/stencil/accum/etc buffers.
622 * \note This function should only be called through the GL API, not
623 * from device drivers (as was done in the past).
626 void _mesa_resizebuffers( GLcontext
*ctx
)
628 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
630 if (MESA_VERBOSE
& VERBOSE_API
)
631 _mesa_debug(ctx
, "glResizeBuffersMESA\n");
633 if (!ctx
->Driver
.GetBufferSize
) {
637 if (ctx
->WinSysDrawBuffer
) {
638 GLuint newWidth
, newHeight
;
639 GLframebuffer
*buffer
= ctx
->WinSysDrawBuffer
;
641 assert(buffer
->Name
== 0);
643 /* ask device driver for size of output buffer */
644 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
646 /* see if size of device driver's color buffer (window) has changed */
647 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
648 if (ctx
->Driver
.ResizeBuffers
)
649 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
653 if (ctx
->WinSysReadBuffer
654 && ctx
->WinSysReadBuffer
!= ctx
->WinSysDrawBuffer
) {
655 GLuint newWidth
, newHeight
;
656 GLframebuffer
*buffer
= ctx
->WinSysReadBuffer
;
658 assert(buffer
->Name
== 0);
660 /* ask device driver for size of read buffer */
661 ctx
->Driver
.GetBufferSize( buffer
, &newWidth
, &newHeight
);
663 /* see if size of device driver's color buffer (window) has changed */
664 if (buffer
->Width
!= newWidth
|| buffer
->Height
!= newHeight
) {
665 if (ctx
->Driver
.ResizeBuffers
)
666 ctx
->Driver
.ResizeBuffers(ctx
, buffer
, newWidth
, newHeight
);
670 ctx
->NewState
|= _NEW_BUFFERS
; /* to update scissor / window bounds */
675 * XXX THIS IS OBSOLETE
678 _mesa_ResizeBuffersMESA( void )
680 GET_CURRENT_CONTEXT(ctx
);
682 if (ctx
->Extensions
.MESA_resize_buffers
)
683 _mesa_resizebuffers( ctx
);
688 * XXX move somewhere else someday?
691 _mesa_SampleCoverageARB(GLclampf value
, GLboolean invert
)
693 GET_CURRENT_CONTEXT(ctx
);
695 if (!ctx
->Extensions
.ARB_multisample
) {
696 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glSampleCoverageARB");
700 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx
);
701 ctx
->Multisample
.SampleCoverageValue
= (GLfloat
) CLAMP(value
, 0.0, 1.0);
702 ctx
->Multisample
.SampleCoverageInvert
= invert
;
703 ctx
->NewState
|= _NEW_MULTISAMPLE
;
706 #endif /* _HAVE_FULL_GL */
711 * Define the scissor box.
713 * \param x, y coordinates of the scissor box lower-left corner.
714 * \param width width of the scissor box.
715 * \param height height of the scissor box.
719 * Verifies the parameters and updates __GLcontextRec::Scissor. On a
720 * change flushes the vertices and notifies the driver via
721 * the dd_function_table::Scissor callback.
724 _mesa_set_scissor(GLcontext
*ctx
,
725 GLint x
, GLint y
, GLsizei width
, GLsizei height
)
727 if (x
== ctx
->Scissor
.X
&&
728 y
== ctx
->Scissor
.Y
&&
729 width
== ctx
->Scissor
.Width
&&
730 height
== ctx
->Scissor
.Height
)
733 FLUSH_VERTICES(ctx
, _NEW_SCISSOR
);
736 ctx
->Scissor
.Width
= width
;
737 ctx
->Scissor
.Height
= height
;
739 if (ctx
->Driver
.Scissor
)
740 ctx
->Driver
.Scissor( ctx
, x
, y
, width
, height
);
745 _mesa_Scissor( GLint x
, GLint y
, GLsizei width
, GLsizei height
)
747 GET_CURRENT_CONTEXT(ctx
);
748 ASSERT_OUTSIDE_BEGIN_END(ctx
);
750 if (width
< 0 || height
< 0) {
751 _mesa_error( ctx
, GL_INVALID_VALUE
, "glScissor" );
755 if (MESA_VERBOSE
& VERBOSE_API
)
756 _mesa_debug(ctx
, "glScissor %d %d %d %d\n", x
, y
, width
, height
);
758 _mesa_set_scissor(ctx
, x
, y
, width
, height
);
763 /**********************************************************************/
764 /** \name Initialization */
768 * Initialize the context's scissor state.
769 * \param ctx the GL context.
772 _mesa_init_scissor(GLcontext
*ctx
)
775 ctx
->Scissor
.Enabled
= GL_FALSE
;
778 ctx
->Scissor
.Width
= 0;
779 ctx
->Scissor
.Height
= 0;
784 * Initialize the context's multisample state.
785 * \param ctx the GL context.
788 _mesa_init_multisample(GLcontext
*ctx
)
790 ctx
->Multisample
.Enabled
= GL_FALSE
;
791 ctx
->Multisample
.SampleAlphaToCoverage
= GL_FALSE
;
792 ctx
->Multisample
.SampleAlphaToOne
= GL_FALSE
;
793 ctx
->Multisample
.SampleCoverage
= GL_FALSE
;
794 ctx
->Multisample
.SampleCoverageValue
= 1.0;
795 ctx
->Multisample
.SampleCoverageInvert
= GL_FALSE
;