Replace GLuint with GLbitfield where appropriate. Also replace GLuint
[mesa.git] / src / mesa / main / buffers.c
1 /**
2 * \file buffers.c
3 * Frame buffer management.
4 */
5
6 /*
7 * Mesa 3-D graphics library
8 * Version: 6.5
9 *
10 * Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
18 *
19 * The above copyright notice and this permission notice shall be included
20 * in all copies or substantial portions of the Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
23 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
26 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
27 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 */
29
30
31 #include "glheader.h"
32 #include "buffers.h"
33 #include "colormac.h"
34 #include "context.h"
35 #include "enums.h"
36 #include "fbobject.h"
37 #include "state.h"
38
39
40 #define BAD_MASK ~0u
41
42
43 #if _HAVE_FULL_GL
44 void GLAPIENTRY
45 _mesa_ClearIndex( GLfloat c )
46 {
47 GET_CURRENT_CONTEXT(ctx);
48 ASSERT_OUTSIDE_BEGIN_END(ctx);
49
50 if (ctx->Color.ClearIndex == (GLuint) c)
51 return;
52
53 FLUSH_VERTICES(ctx, _NEW_COLOR);
54 ctx->Color.ClearIndex = (GLuint) c;
55
56 if (!ctx->Visual.rgbMode && ctx->Driver.ClearIndex) {
57 /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
58 (*ctx->Driver.ClearIndex)( ctx, ctx->Color.ClearIndex );
59 }
60 }
61 #endif
62
63
64 /**
65 * Specify the clear values for the color buffers.
66 *
67 * \param red red color component.
68 * \param green green color component.
69 * \param blue blue color component.
70 * \param alpha alpha component.
71 *
72 * \sa glClearColor().
73 *
74 * Clamps the parameters and updates gl_colorbuffer_attrib::ClearColor. On a
75 * change, flushes the vertices and notifies the driver via the
76 * dd_function_table::ClearColor callback.
77 */
78 void GLAPIENTRY
79 _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha )
80 {
81 GLfloat tmp[4];
82 GET_CURRENT_CONTEXT(ctx);
83 ASSERT_OUTSIDE_BEGIN_END(ctx);
84
85 tmp[0] = CLAMP(red, 0.0F, 1.0F);
86 tmp[1] = CLAMP(green, 0.0F, 1.0F);
87 tmp[2] = CLAMP(blue, 0.0F, 1.0F);
88 tmp[3] = CLAMP(alpha, 0.0F, 1.0F);
89
90 if (TEST_EQ_4V(tmp, ctx->Color.ClearColor))
91 return; /* no change */
92
93 FLUSH_VERTICES(ctx, _NEW_COLOR);
94 COPY_4V(ctx->Color.ClearColor, tmp);
95
96 if (ctx->Visual.rgbMode && ctx->Driver.ClearColor) {
97 /* it's OK to call glClearColor in CI mode but it should be a NOP */
98 (*ctx->Driver.ClearColor)(ctx, ctx->Color.ClearColor);
99 }
100 }
101
102
103 /**
104 * Clear buffers.
105 *
106 * \param mask bit-mask indicating the buffers to be cleared.
107 *
108 * Flushes the vertices and verifies the parameter. If __GLcontextRec::NewState
109 * is set then calls _mesa_update_state() to update gl_frame_buffer::_Xmin,
110 * etc. If the rasterization mode is set to GL_RENDER then requests the driver
111 * to clear the buffers, via the dd_function_table::Clear callback.
112 */
113 void GLAPIENTRY
114 _mesa_Clear( GLbitfield mask )
115 {
116 GET_CURRENT_CONTEXT(ctx);
117 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
118
119 if (MESA_VERBOSE & VERBOSE_API)
120 _mesa_debug(ctx, "glClear 0x%x\n", mask);
121
122 if (mask & ~(GL_COLOR_BUFFER_BIT |
123 GL_DEPTH_BUFFER_BIT |
124 GL_STENCIL_BUFFER_BIT |
125 GL_ACCUM_BUFFER_BIT)) {
126 /* invalid bit set */
127 _mesa_error( ctx, GL_INVALID_VALUE, "glClear(0x%x)", mask);
128 return;
129 }
130
131 if (ctx->NewState) {
132 _mesa_update_state( ctx ); /* update _Xmin, etc */
133 }
134
135 if (ctx->RenderMode == GL_RENDER) {
136 const GLint x = ctx->DrawBuffer->_Xmin;
137 const GLint y = ctx->DrawBuffer->_Ymin;
138 const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
139 const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
140 GLbitfield bufferMask;
141
142 /* don't clear depth buffer if depth writing disabled */
143 if (!ctx->Depth.Mask)
144 mask &= ~GL_DEPTH_BUFFER_BIT;
145
146 /* Build the bitmask to send to device driver's Clear function.
147 * Note that the GL_COLOR_BUFFER_BIT flag will expand to 0, 1, 2 or 4
148 * of the BUFFER_BIT_FRONT/BACK_LEFT/RIGHT flags, or one of the
149 * BUFFER_BIT_COLORn flags.
150 */
151 bufferMask = 0;
152 if (mask & GL_COLOR_BUFFER_BIT) {
153 bufferMask |= ctx->DrawBuffer->_ColorDrawBufferMask[0];
154 }
155
156 if ((mask & GL_DEPTH_BUFFER_BIT)
157 && ctx->DrawBuffer->Visual.haveDepthBuffer) {
158 bufferMask |= BUFFER_BIT_DEPTH;
159 }
160
161 if ((mask & GL_STENCIL_BUFFER_BIT)
162 && ctx->DrawBuffer->Visual.haveStencilBuffer) {
163 bufferMask |= BUFFER_BIT_STENCIL;
164 }
165
166 if ((mask & GL_ACCUM_BUFFER_BIT)
167 && ctx->DrawBuffer->Visual.haveAccumBuffer) {
168 bufferMask |= BUFFER_BIT_ACCUM;
169 }
170
171 ASSERT(ctx->Driver.Clear);
172 ctx->Driver.Clear( ctx, bufferMask, (GLboolean) !ctx->Scissor.Enabled,
173 x, y, width, height );
174 }
175 }
176
177
178
179 /**
180 * Return bitmask of BUFFER_BIT_* flags indicating which color buffers are
181 * available to the rendering context.
182 * This depends on the framebuffer we're writing to. For window system
183 * framebuffers we look at the framebuffer's visual. But for user-
184 * create framebuffers we look at the number of supported color attachments.
185 */
186 static GLbitfield
187 supported_buffer_bitmask(const GLcontext *ctx, GLuint framebufferID)
188 {
189 GLbitfield mask = 0x0;
190 GLint i;
191
192 if (framebufferID > 0) {
193 /* A user-created renderbuffer */
194 ASSERT(ctx->Extensions.EXT_framebuffer_object);
195 for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
196 mask |= (BUFFER_BIT_COLOR0 << i);
197 }
198 }
199 else {
200 /* A window system renderbuffer */
201 mask = BUFFER_BIT_FRONT_LEFT; /* always have this */
202 if (ctx->Visual.stereoMode) {
203 mask |= BUFFER_BIT_FRONT_RIGHT;
204 if (ctx->Visual.doubleBufferMode) {
205 mask |= BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT;
206 }
207 }
208 else if (ctx->Visual.doubleBufferMode) {
209 mask |= BUFFER_BIT_BACK_LEFT;
210 }
211
212 for (i = 0; i < ctx->Visual.numAuxBuffers; i++) {
213 mask |= (BUFFER_BIT_AUX0 << i);
214 }
215 }
216
217 return mask;
218 }
219
220
221 /**
222 * Helper routine used by glDrawBuffer and glDrawBuffersARB.
223 * Given a GLenum naming one or more color buffers (such as
224 * GL_FRONT_AND_BACK), return the corresponding bitmask of BUFFER_BIT_* flags.
225 */
226 static GLbitfield
227 draw_buffer_enum_to_bitmask(GLenum buffer)
228 {
229 switch (buffer) {
230 case GL_NONE:
231 return 0;
232 case GL_FRONT:
233 return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_FRONT_RIGHT;
234 case GL_BACK:
235 return BUFFER_BIT_BACK_LEFT | BUFFER_BIT_BACK_RIGHT;
236 case GL_RIGHT:
237 return BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT;
238 case GL_FRONT_RIGHT:
239 return BUFFER_BIT_FRONT_RIGHT;
240 case GL_BACK_RIGHT:
241 return BUFFER_BIT_BACK_RIGHT;
242 case GL_BACK_LEFT:
243 return BUFFER_BIT_BACK_LEFT;
244 case GL_FRONT_AND_BACK:
245 return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT
246 | BUFFER_BIT_FRONT_RIGHT | BUFFER_BIT_BACK_RIGHT;
247 case GL_LEFT:
248 return BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT;
249 case GL_FRONT_LEFT:
250 return BUFFER_BIT_FRONT_LEFT;
251 case GL_AUX0:
252 return BUFFER_BIT_AUX0;
253 case GL_AUX1:
254 return BUFFER_BIT_AUX1;
255 case GL_AUX2:
256 return BUFFER_BIT_AUX2;
257 case GL_AUX3:
258 return BUFFER_BIT_AUX3;
259 case GL_COLOR_ATTACHMENT0_EXT:
260 return BUFFER_BIT_COLOR0;
261 case GL_COLOR_ATTACHMENT1_EXT:
262 return BUFFER_BIT_COLOR1;
263 case GL_COLOR_ATTACHMENT2_EXT:
264 return BUFFER_BIT_COLOR2;
265 case GL_COLOR_ATTACHMENT3_EXT:
266 return BUFFER_BIT_COLOR3;
267 default:
268 /* error */
269 return BAD_MASK;
270 }
271 }
272
273
274 /**
275 * Helper routine used by glReadBuffer.
276 * Given a GLenum naming (a) color buffer(s), return the corresponding
277 * bitmask of DD_* flags.
278 */
279 static GLbitfield
280 read_buffer_enum_to_bitmask(GLenum buffer)
281 {
282 switch (buffer) {
283 case GL_FRONT:
284 return BUFFER_BIT_FRONT_LEFT;
285 case GL_BACK:
286 return BUFFER_BIT_BACK_LEFT;
287 case GL_RIGHT:
288 return BUFFER_BIT_FRONT_RIGHT;
289 case GL_FRONT_RIGHT:
290 return BUFFER_BIT_FRONT_RIGHT;
291 case GL_BACK_RIGHT:
292 return BUFFER_BIT_BACK_RIGHT;
293 case GL_BACK_LEFT:
294 return BUFFER_BIT_BACK_LEFT;
295 case GL_LEFT:
296 return BUFFER_BIT_FRONT_LEFT;
297 case GL_FRONT_LEFT:
298 return BUFFER_BIT_FRONT_LEFT;
299 case GL_AUX0:
300 return BUFFER_BIT_AUX0;
301 case GL_AUX1:
302 return BUFFER_BIT_AUX1;
303 case GL_AUX2:
304 return BUFFER_BIT_AUX2;
305 case GL_AUX3:
306 return BUFFER_BIT_AUX3;
307 case GL_COLOR_ATTACHMENT0_EXT:
308 return BUFFER_BIT_COLOR0;
309 case GL_COLOR_ATTACHMENT1_EXT:
310 return BUFFER_BIT_COLOR1;
311 case GL_COLOR_ATTACHMENT2_EXT:
312 return BUFFER_BIT_COLOR2;
313 case GL_COLOR_ATTACHMENT3_EXT:
314 return BUFFER_BIT_COLOR3;
315 default:
316 /* error */
317 return BAD_MASK;
318 }
319 }
320
321
322 /**
323 * Called by glDrawBuffer().
324 * Specify which renderbuffer(s) to draw into for the first color output.
325 * <buffer> can name zero, one, two or four renderbuffers!
326 * \sa _mesa_DrawBuffersARB
327 *
328 * \param buffer buffer token such as GL_LEFT or GL_FRONT_AND_BACK, etc.
329 */
330 void GLAPIENTRY
331 _mesa_DrawBuffer(GLenum buffer)
332 {
333 GLuint bufferID;
334 GLbitfield destMask;
335 GET_CURRENT_CONTEXT(ctx);
336 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex... */
337
338 if (MESA_VERBOSE & VERBOSE_API) {
339 _mesa_debug(ctx, "glDrawBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
340 }
341
342 bufferID = ctx->DrawBuffer->Name;
343
344 if (buffer == GL_NONE) {
345 destMask = 0x0;
346 }
347 else {
348 const GLbitfield supportedMask = supported_buffer_bitmask(ctx, bufferID);
349 destMask = draw_buffer_enum_to_bitmask(buffer);
350 if (destMask == BAD_MASK) {
351 /* totally bogus buffer */
352 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffer(buffer)");
353 return;
354 }
355 destMask &= supportedMask;
356 if (destMask == 0x0) {
357 /* none of the named color buffers exist! */
358 _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffer(buffer)");
359 return;
360 }
361 }
362
363 /* if we get here, there's no error so set new state */
364 _mesa_drawbuffers(ctx, 1, &buffer, &destMask);
365 }
366
367
368 /**
369 * Called by glDrawBuffersARB; specifies the destination color renderbuffers
370 * for N fragment program color outputs.
371 * \sa _mesa_DrawBuffer
372 * \param n number of outputs
373 * \param buffers array [n] of renderbuffer names. Unlike glDrawBuffer, the
374 * names cannot specify more than one buffer. For example,
375 * GL_FRONT_AND_BACK is illegal.
376 */
377 void GLAPIENTRY
378 _mesa_DrawBuffersARB(GLsizei n, const GLenum *buffers)
379 {
380 GLint output;
381 GLuint bufferID;
382 GLbitfield usedBufferMask, supportedMask;
383 GLbitfield destMask[MAX_DRAW_BUFFERS];
384 GET_CURRENT_CONTEXT(ctx);
385 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
386
387 if (!ctx->Extensions.ARB_draw_buffers) {
388 _mesa_error(ctx, GL_INVALID_OPERATION, "glDrawBuffersARB");
389 return;
390 }
391 if (n < 1 || n > (GLsizei) ctx->Const.MaxDrawBuffers) {
392 _mesa_error(ctx, GL_INVALID_VALUE, "glDrawBuffersARB(n)");
393 return;
394 }
395
396 bufferID = ctx->DrawBuffer->Name;
397
398 supportedMask = supported_buffer_bitmask(ctx, bufferID);
399 usedBufferMask = 0x0;
400
401 /* complicated error checking... */
402 for (output = 0; output < n; output++) {
403 if (buffers[output] == GL_NONE) {
404 destMask[output] = 0x0;
405 }
406 else {
407 destMask[output] = draw_buffer_enum_to_bitmask(buffers[output]);
408 if (destMask[output] == BAD_MASK
409 || _mesa_bitcount(destMask[output]) > 1) {
410 _mesa_error(ctx, GL_INVALID_ENUM, "glDrawBuffersARB(buffer)");
411 return;
412 }
413 destMask[output] &= supportedMask;
414 if (destMask[output] == 0) {
415 _mesa_error(ctx, GL_INVALID_OPERATION,
416 "glDrawBuffersARB(unsupported buffer)");
417 return;
418 }
419 if (destMask[output] & usedBufferMask) {
420 /* can't specify a dest buffer more than once! */
421 _mesa_error(ctx, GL_INVALID_OPERATION,
422 "glDrawBuffersARB(duplicated buffer)");
423 return;
424 }
425
426 /* update bitmask */
427 usedBufferMask |= destMask[output];
428 }
429 }
430
431 /* OK, if we get here, there were no errors so set the new state */
432 _mesa_drawbuffers(ctx, n, buffers, destMask);
433 }
434
435
436 /**
437 * Set color output state. Traditionally, there was only one color
438 * output, but fragment programs can now have several distinct color
439 * outputs (see GL_ARB_draw_buffers). This function sets the state
440 * for one such color output.
441 * \param ctx current context
442 * \param output which fragment program output
443 * \param buffer buffer to write to (like GL_LEFT)
444 * \param destMask BUFFER_* bitmask
445 * (like BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
446 */
447 static void
448 set_color_output(GLcontext *ctx, GLuint output, GLenum buffer,
449 GLbitfield destMask)
450 {
451 struct gl_framebuffer *fb = ctx->DrawBuffer;
452
453 ASSERT(output < ctx->Const.MaxDrawBuffers);
454
455 fb->ColorDrawBuffer[output] = buffer;
456 fb->_ColorDrawBufferMask[output] = destMask;
457
458 if (fb->Name == 0) {
459 /* Set traditional state var */
460 ctx->Color.DrawBuffer[output] = buffer;
461 }
462
463 /* not really needed, will be set later */
464 fb->_NumColorDrawBuffers[output] = 0;
465 }
466
467
468 /**
469 * Helper routine used by _mesa_DrawBuffer, _mesa_DrawBuffersARB and
470 * _mesa_PopAttrib to set drawbuffer state.
471 * All error checking will have been done prior to calling this function
472 * so nothing should go wrong at this point.
473 * \param ctx current context
474 * \param n number of color outputs to set
475 * \param buffers array[n] of colorbuffer names, like GL_LEFT.
476 * \param destMask array[n] of BUFFER_* bitmasks which correspond to the
477 * colorbuffer names. (i.e. GL_FRONT_AND_BACK =>
478 * BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT).
479 */
480 void
481 _mesa_drawbuffers(GLcontext *ctx, GLsizei n, const GLenum *buffers,
482 const GLbitfield *destMask)
483 {
484 GLbitfield mask[MAX_DRAW_BUFFERS];
485 GLint output;
486
487 if (!destMask) {
488 /* compute destMask values now */
489 const GLuint bufferID = ctx->DrawBuffer->Name;
490 const GLbitfield supportedMask = supported_buffer_bitmask(ctx, bufferID);
491 for (output = 0; output < n; output++) {
492 mask[output] = draw_buffer_enum_to_bitmask(buffers[output]);
493 ASSERT(mask[output] != BAD_MASK);
494 mask[output] &= supportedMask;
495 }
496 destMask = mask;
497 }
498
499 for (output = 0; output < n; output++) {
500 set_color_output(ctx, output, buffers[output], destMask[output]);
501 }
502
503 /* set remaining color outputs to NONE */
504 for (output = n; output < ctx->Const.MaxDrawBuffers; output++) {
505 set_color_output(ctx, output, GL_NONE, 0x0);
506 }
507
508 ctx->NewState |= _NEW_COLOR;
509
510 /*
511 * Call device driver function.
512 */
513 if (ctx->Driver.DrawBuffers)
514 ctx->Driver.DrawBuffers(ctx, n, buffers);
515 else if (ctx->Driver.DrawBuffer)
516 ctx->Driver.DrawBuffer(ctx, buffers[0]);
517 }
518
519
520
521 /**
522 * Called by glReadBuffer to set the source renderbuffer for reading pixels.
523 * \param mode color buffer such as GL_FRONT, GL_BACK, etc.
524 */
525 void GLAPIENTRY
526 _mesa_ReadBuffer(GLenum buffer)
527 {
528 struct gl_framebuffer *fb;
529 GLbitfield srcMask, supportedMask;
530 GLuint bufferID;
531 GET_CURRENT_CONTEXT(ctx);
532 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
533
534 fb = ctx->ReadBuffer;
535 bufferID = fb->Name;
536
537 if (MESA_VERBOSE & VERBOSE_API)
538 _mesa_debug(ctx, "glReadBuffer %s\n", _mesa_lookup_enum_by_nr(buffer));
539
540 if (bufferID > 0 && buffer == GL_NONE) {
541 /* legal! */
542 srcMask = 0x0;
543 }
544 else {
545 /* general case */
546 srcMask = read_buffer_enum_to_bitmask(buffer);
547 if (srcMask == BAD_MASK) {
548 _mesa_error(ctx, GL_INVALID_ENUM, "glReadBuffer(buffer)");
549 return;
550 }
551 supportedMask = supported_buffer_bitmask(ctx, bufferID);
552 if ((srcMask & supportedMask) == 0) {
553 _mesa_error(ctx, GL_INVALID_OPERATION, "glReadBuffer(buffer)");
554 return;
555 }
556 }
557
558 if (bufferID == 0) {
559 ctx->Pixel.ReadBuffer = buffer;
560 }
561 fb->ColorReadBuffer = buffer;
562 fb->_ColorReadBufferMask = srcMask;
563
564 ctx->NewState |= _NEW_PIXEL;
565
566 /*
567 * Call device driver function.
568 */
569 if (ctx->Driver.ReadBuffer)
570 (*ctx->Driver.ReadBuffer)(ctx, buffer);
571 }
572
573
574 #if _HAVE_FULL_GL
575
576 /**
577 * GL_MESA_resize_buffers extension.
578 *
579 * When this function is called, we'll ask the window system how large
580 * the current window is. If it's a new size, we'll call the driver's
581 * ResizeBuffers function. The driver will then resize its color buffers
582 * as needed, and maybe call the swrast's routine for reallocating
583 * swrast-managed depth/stencil/accum/etc buffers.
584 * \note This function may be called from within Mesa or called by the
585 * user directly (see the GL_MESA_resize_buffers extension).
586 */
587 void GLAPIENTRY
588 _mesa_ResizeBuffersMESA( void )
589 {
590 GET_CURRENT_CONTEXT(ctx);
591
592 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
593
594 if (MESA_VERBOSE & VERBOSE_API)
595 _mesa_debug(ctx, "glResizeBuffersMESA\n");
596
597 if (ctx->WinSysDrawBuffer) {
598 GLuint newWidth, newHeight;
599 GLframebuffer *buffer = ctx->WinSysDrawBuffer;
600
601 assert(buffer->Name == 0);
602
603 /* ask device driver for size of output buffer */
604 ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
605
606 /* see if size of device driver's color buffer (window) has changed */
607 if (buffer->Width != newWidth || buffer->Height != newHeight) {
608 if (ctx->Driver.ResizeBuffers)
609 ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );
610 }
611 }
612
613 if (ctx->WinSysReadBuffer
614 && ctx->WinSysReadBuffer != ctx->WinSysDrawBuffer) {
615 GLuint newWidth, newHeight;
616 GLframebuffer *buffer = ctx->WinSysReadBuffer;
617
618 assert(buffer->Name == 0);
619
620 /* ask device driver for size of read buffer */
621 ctx->Driver.GetBufferSize( buffer, &newWidth, &newHeight );
622
623 /* see if size of device driver's color buffer (window) has changed */
624 if (buffer->Width != newWidth || buffer->Height != newHeight) {
625 if (ctx->Driver.ResizeBuffers)
626 ctx->Driver.ResizeBuffers(ctx, buffer, newWidth, newHeight );
627 }
628 }
629
630 ctx->NewState |= _NEW_BUFFERS; /* to update scissor / window bounds */
631 }
632
633
634 /*
635 * XXX move somewhere else someday?
636 */
637 void GLAPIENTRY
638 _mesa_SampleCoverageARB(GLclampf value, GLboolean invert)
639 {
640 GET_CURRENT_CONTEXT(ctx);
641
642 if (!ctx->Extensions.ARB_multisample) {
643 _mesa_error(ctx, GL_INVALID_OPERATION, "glSampleCoverageARB");
644 return;
645 }
646
647 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx );
648 ctx->Multisample.SampleCoverageValue = (GLfloat) CLAMP(value, 0.0, 1.0);
649 ctx->Multisample.SampleCoverageInvert = invert;
650 ctx->NewState |= _NEW_MULTISAMPLE;
651 }
652
653 #endif /* _HAVE_FULL_GL */
654
655
656
657 /**
658 * Define the scissor box.
659 *
660 * \param x, y coordinates of the scissor box lower-left corner.
661 * \param width width of the scissor box.
662 * \param height height of the scissor box.
663 *
664 * \sa glScissor().
665 *
666 * Verifies the parameters and updates __GLcontextRec::Scissor. On a
667 * change flushes the vertices and notifies the driver via
668 * the dd_function_table::Scissor callback.
669 */
670 void GLAPIENTRY
671 _mesa_Scissor( GLint x, GLint y, GLsizei width, GLsizei height )
672 {
673 GET_CURRENT_CONTEXT(ctx);
674 ASSERT_OUTSIDE_BEGIN_END(ctx);
675
676 if (width < 0 || height < 0) {
677 _mesa_error( ctx, GL_INVALID_VALUE, "glScissor" );
678 return;
679 }
680
681 if (MESA_VERBOSE & VERBOSE_API)
682 _mesa_debug(ctx, "glScissor %d %d %d %d\n", x, y, width, height);
683
684 if (x == ctx->Scissor.X &&
685 y == ctx->Scissor.Y &&
686 width == ctx->Scissor.Width &&
687 height == ctx->Scissor.Height)
688 return;
689
690 FLUSH_VERTICES(ctx, _NEW_SCISSOR);
691 ctx->Scissor.X = x;
692 ctx->Scissor.Y = y;
693 ctx->Scissor.Width = width;
694 ctx->Scissor.Height = height;
695
696 if (ctx->Driver.Scissor)
697 ctx->Driver.Scissor( ctx, x, y, width, height );
698 }
699
700
701
702 /**********************************************************************/
703 /** \name Initialization */
704 /*@{*/
705
706 /**
707 * Initialize the context's scissor state.
708 * \param ctx the GL context.
709 */
710 void
711 _mesa_init_scissor(GLcontext *ctx)
712 {
713 /* Scissor group */
714 ctx->Scissor.Enabled = GL_FALSE;
715 ctx->Scissor.X = 0;
716 ctx->Scissor.Y = 0;
717 ctx->Scissor.Width = 0;
718 ctx->Scissor.Height = 0;
719 }
720
721
722 /**
723 * Initialize the context's multisample state.
724 * \param ctx the GL context.
725 */
726 void
727 _mesa_init_multisample(GLcontext *ctx)
728 {
729 ctx->Multisample.Enabled = GL_FALSE;
730 ctx->Multisample.SampleAlphaToCoverage = GL_FALSE;
731 ctx->Multisample.SampleAlphaToOne = GL_FALSE;
732 ctx->Multisample.SampleCoverage = GL_FALSE;
733 ctx->Multisample.SampleCoverageValue = 1.0;
734 ctx->Multisample.SampleCoverageInvert = GL_FALSE;
735 }
736
737 /*@}*/