dd87009031febb29fae29f0f0a36877e64b5cce8
3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
48 _mesa_ClearIndex( GLfloat c
)
50 GET_CURRENT_CONTEXT(ctx
);
51 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
, "glClearIndex");
52 ctx
->Color
.ClearIndex
= (GLuint
) c
;
53 if (!ctx
->Visual
->RGBAflag
) {
54 /* it's OK to call glClearIndex in RGBA mode but it should be a NOP */
55 (*ctx
->Driver
.ClearIndex
)( ctx
, ctx
->Color
.ClearIndex
);
62 _mesa_ClearColor( GLclampf red
, GLclampf green
,
63 GLclampf blue
, GLclampf alpha
)
65 GET_CURRENT_CONTEXT(ctx
);
66 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
, "glClearColor");
68 ctx
->Color
.ClearColor
[0] = CLAMP( red
, 0.0F
, 1.0F
);
69 ctx
->Color
.ClearColor
[1] = CLAMP( green
, 0.0F
, 1.0F
);
70 ctx
->Color
.ClearColor
[2] = CLAMP( blue
, 0.0F
, 1.0F
);
71 ctx
->Color
.ClearColor
[3] = CLAMP( alpha
, 0.0F
, 1.0F
);
73 if (ctx
->Visual
->RGBAflag
) {
74 GLubyte r
= (GLint
) (ctx
->Color
.ClearColor
[0] * 255.0F
);
75 GLubyte g
= (GLint
) (ctx
->Color
.ClearColor
[1] * 255.0F
);
76 GLubyte b
= (GLint
) (ctx
->Color
.ClearColor
[2] * 255.0F
);
77 GLubyte a
= (GLint
) (ctx
->Color
.ClearColor
[3] * 255.0F
);
78 (*ctx
->Driver
.ClearColor
)( ctx
, r
, g
, b
, a
);
86 * Clear the color buffer when glColorMask or glIndexMask is in effect.
89 clear_color_buffer_with_masking( GLcontext
*ctx
)
91 const GLint x
= ctx
->DrawBuffer
->Xmin
;
92 const GLint y
= ctx
->DrawBuffer
->Ymin
;
93 const GLint height
= ctx
->DrawBuffer
->Ymax
- ctx
->DrawBuffer
->Ymin
+ 1;
94 const GLint width
= ctx
->DrawBuffer
->Xmax
- ctx
->DrawBuffer
->Xmin
+ 1;
96 if (ctx
->Visual
->RGBAflag
) {
98 const GLubyte r
= (GLint
) (ctx
->Color
.ClearColor
[0] * 255.0F
);
99 const GLubyte g
= (GLint
) (ctx
->Color
.ClearColor
[1] * 255.0F
);
100 const GLubyte b
= (GLint
) (ctx
->Color
.ClearColor
[2] * 255.0F
);
101 const GLubyte a
= (GLint
) (ctx
->Color
.ClearColor
[3] * 255.0F
);
103 for (i
= 0; i
< height
; i
++) {
104 GLubyte rgba
[MAX_WIDTH
][4];
106 for (j
=0; j
<width
; j
++) {
112 _mesa_mask_rgba_span( ctx
, width
, x
, y
+ i
, rgba
);
113 (*ctx
->Driver
.WriteRGBASpan
)( ctx
, width
, x
, y
+ i
,
114 (CONST
GLubyte (*)[4])rgba
, NULL
);
118 /* Color index mode */
119 GLuint span
[MAX_WIDTH
];
120 GLubyte mask
[MAX_WIDTH
];
122 MEMSET( mask
, 1, width
);
123 for (i
=0;i
<height
;i
++) {
124 for (j
=0;j
<width
;j
++) {
125 span
[j
] = ctx
->Color
.ClearIndex
;
127 _mesa_mask_index_span( ctx
, width
, x
, y
+ i
, span
);
128 (*ctx
->Driver
.WriteCI32Span
)( ctx
, width
, x
, y
+ i
, span
, mask
);
136 * Clear a color buffer without index/channel masking.
139 clear_color_buffer(GLcontext
*ctx
)
141 const GLint x
= ctx
->DrawBuffer
->Xmin
;
142 const GLint y
= ctx
->DrawBuffer
->Ymin
;
143 const GLint height
= ctx
->DrawBuffer
->Ymax
- ctx
->DrawBuffer
->Ymin
+ 1;
144 const GLint width
= ctx
->DrawBuffer
->Xmax
- ctx
->DrawBuffer
->Xmin
+ 1;
145 const GLuint colorMask
= *((GLuint
*) &ctx
->Color
.ColorMask
);
147 if (ctx
->Visual
->RGBAflag
) {
149 const GLubyte r
= (GLint
) (ctx
->Color
.ClearColor
[0] * 255.0F
);
150 const GLubyte g
= (GLint
) (ctx
->Color
.ClearColor
[1] * 255.0F
);
151 const GLubyte b
= (GLint
) (ctx
->Color
.ClearColor
[2] * 255.0F
);
152 const GLubyte a
= (GLint
) (ctx
->Color
.ClearColor
[3] * 255.0F
);
153 GLubyte span
[MAX_WIDTH
][4];
156 ASSERT(colorMask
== 0xffffffff);
158 for (i
= 0; i
< width
; i
++) {
164 for (i
= 0; i
< height
; i
++) {
165 (*ctx
->Driver
.WriteRGBASpan
)( ctx
, width
, x
, y
+ i
,
166 (CONST
GLubyte (*)[4]) span
, NULL
);
170 /* Color index mode */
171 ASSERT(ctx
->Color
.IndexMask
== ~0);
172 if (ctx
->Visual
->IndexBits
== 8) {
174 GLubyte span
[MAX_WIDTH
];
176 MEMSET(span
, ctx
->Color
.ClearIndex
, width
);
177 for (i
= 0; i
< height
; i
++) {
178 (*ctx
->Driver
.WriteCI8Span
)( ctx
, width
, x
, y
+ i
, span
, NULL
);
182 /* non 8-bit clear */
183 GLuint span
[MAX_WIDTH
];
185 for (i
= 0; i
< width
; i
++) {
186 span
[i
] = ctx
->Color
.ClearIndex
;
188 for (i
= 0; i
< height
; i
++) {
189 (*ctx
->Driver
.WriteCI32Span
)( ctx
, width
, x
, y
+ i
, span
, NULL
);
198 * Clear the front/back/left/right color buffers.
199 * This function is usually only called if we need to clear the
200 * buffers with masking.
203 clear_color_buffers(GLcontext
*ctx
)
205 const GLuint colorMask
= *((GLuint
*) &ctx
->Color
.ColorMask
);
208 /* loop over four possible dest color buffers */
209 for (bufferBit
= 1; bufferBit
<= 8; bufferBit
= bufferBit
<< 1) {
210 if (bufferBit
& ctx
->Color
.DrawDestMask
) {
211 if (bufferBit
== FRONT_LEFT_BIT
) {
212 (void) (*ctx
->Driver
.SetDrawBuffer
)( ctx
, GL_FRONT_LEFT
);
214 else if (bufferBit
== FRONT_RIGHT_BIT
) {
215 (void) (*ctx
->Driver
.SetDrawBuffer
)( ctx
, GL_FRONT_RIGHT
);
217 else if (bufferBit
== BACK_LEFT_BIT
) {
218 (void) (*ctx
->Driver
.SetDrawBuffer
)( ctx
, GL_BACK_LEFT
);
221 (void) (*ctx
->Driver
.SetDrawBuffer
)( ctx
, GL_BACK_RIGHT
);
224 if (colorMask
!= 0xffffffff) {
225 clear_color_buffer_with_masking(ctx
);
228 clear_color_buffer(ctx
);
233 /* restore default dest buffer */
234 (void) (*ctx
->Driver
.SetDrawBuffer
)( ctx
, ctx
->Color
.DriverDrawBuffer
);
240 _mesa_Clear( GLbitfield mask
)
242 GET_CURRENT_CONTEXT(ctx
);
244 GLdouble t0
= gl_time();
246 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
, "glClear");
248 if (MESA_VERBOSE
& VERBOSE_API
)
249 fprintf(stderr
, "glClear 0x%x\n", mask
);
252 gl_update_state( ctx
);
255 if (ctx
->RenderMode
==GL_RENDER
) {
256 const GLint x
= ctx
->DrawBuffer
->Xmin
;
257 const GLint y
= ctx
->DrawBuffer
->Ymin
;
258 const GLint height
= ctx
->DrawBuffer
->Ymax
- ctx
->DrawBuffer
->Ymin
+ 1;
259 const GLint width
= ctx
->DrawBuffer
->Xmax
- ctx
->DrawBuffer
->Xmin
+ 1;
263 /* don't clear depth buffer if depth writing disabled */
264 if (!ctx
->Depth
.Mask
)
265 CLEAR_BITS(mask
, GL_DEPTH_BUFFER_BIT
);
267 /* Build bitmask to send to driver Clear function */
268 ddMask
= mask
& (GL_DEPTH_BUFFER_BIT
|
269 GL_STENCIL_BUFFER_BIT
|
270 GL_ACCUM_BUFFER_BIT
);
271 if (mask
& GL_COLOR_BUFFER_BIT
) {
272 ddMask
|= ctx
->Color
.DrawDestMask
;
275 ASSERT(ctx
->Driver
.Clear
);
276 newMask
= (*ctx
->Driver
.Clear
)( ctx
, ddMask
, !ctx
->Scissor
.Enabled
,
277 x
, y
, width
, height
);
281 GLbitfield legalBits
= DD_FRONT_LEFT_BIT
|
288 assert((newMask
& (~legalBits
)) == 0);
292 /* do software clearing here */
294 if (newMask
& ctx
->Color
.DrawDestMask
) clear_color_buffers(ctx
);
295 if (newMask
& GL_DEPTH_BUFFER_BIT
) _mesa_clear_depth_buffer(ctx
);
296 if (newMask
& GL_ACCUM_BUFFER_BIT
) _mesa_clear_accum_buffer(ctx
);
297 if (newMask
& GL_STENCIL_BUFFER_BIT
) _mesa_clear_stencil_buffer(ctx
);
300 /* clear software-based alpha buffer(s) */
301 if ( (mask
& GL_COLOR_BUFFER_BIT
)
302 && ctx
->DrawBuffer
->UseSoftwareAlphaBuffers
303 && ctx
->Color
.ColorMask
[ACOMP
]) {
304 _mesa_clear_alpha_buffers( ctx
);
308 ctx
->ClearTime
+= gl_time() - t0
;
316 _mesa_DrawBuffer( GLenum mode
)
318 GET_CURRENT_CONTEXT(ctx
);
319 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
, "glDrawBuffer");
321 if (MESA_VERBOSE
& VERBOSE_API
)
322 fprintf(stderr
, "glDrawBuffer %s\n", gl_lookup_enum_by_nr(mode
));
329 /* AUX buffers not implemented in Mesa at this time */
330 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
333 if (!ctx
->Visual
->StereoFlag
) {
334 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
337 if (ctx
->Visual
->DBflag
)
338 ctx
->Color
.DrawDestMask
= FRONT_RIGHT_BIT
| BACK_RIGHT_BIT
;
340 ctx
->Color
.DrawDestMask
= FRONT_RIGHT_BIT
;
343 if (!ctx
->Visual
->StereoFlag
) {
344 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
347 ctx
->Color
.DrawDestMask
= FRONT_RIGHT_BIT
;
350 if (!ctx
->Visual
->StereoFlag
) {
351 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
354 if (!ctx
->Visual
->DBflag
) {
355 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
358 ctx
->Color
.DrawDestMask
= BACK_RIGHT_BIT
;
361 if (!ctx
->Visual
->DBflag
) {
362 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
365 ctx
->Color
.DrawDestMask
= BACK_LEFT_BIT
;
367 case GL_FRONT_AND_BACK
:
368 if (!ctx
->Visual
->DBflag
) {
369 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
372 if (ctx
->Visual
->StereoFlag
)
373 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
| BACK_LEFT_BIT
374 | FRONT_RIGHT_BIT
| BACK_RIGHT_BIT
;
376 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
| BACK_LEFT_BIT
;
379 if (!ctx
->Visual
->DBflag
) {
380 gl_error( ctx
, GL_INVALID_OPERATION
, "glDrawBuffer" );
383 if (ctx
->Visual
->StereoFlag
)
384 ctx
->Color
.DrawDestMask
= BACK_LEFT_BIT
| BACK_RIGHT_BIT
;
386 ctx
->Color
.DrawDestMask
= BACK_LEFT_BIT
;
390 if (ctx
->Visual
->DBflag
)
391 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
| BACK_LEFT_BIT
;
393 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
;
397 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
;
401 if (ctx
->Visual
->StereoFlag
)
402 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
| FRONT_RIGHT_BIT
;
404 ctx
->Color
.DrawDestMask
= FRONT_LEFT_BIT
;
408 ctx
->Color
.DrawDestMask
= 0;
411 gl_error( ctx
, GL_INVALID_ENUM
, "glDrawBuffer" );
416 * Make the dest buffer mode more precise if possible
418 if (mode
== GL_LEFT
&& !ctx
->Visual
->DBflag
)
419 ctx
->Color
.DriverDrawBuffer
= GL_FRONT_LEFT
;
420 else if (mode
== GL_RIGHT
&& !ctx
->Visual
->DBflag
)
421 ctx
->Color
.DriverDrawBuffer
= GL_FRONT_RIGHT
;
422 else if (mode
== GL_FRONT
&& !ctx
->Visual
->StereoFlag
)
423 ctx
->Color
.DriverDrawBuffer
= GL_FRONT_LEFT
;
424 else if (mode
== GL_BACK
&& !ctx
->Visual
->StereoFlag
)
425 ctx
->Color
.DriverDrawBuffer
= GL_BACK_LEFT
;
427 ctx
->Color
.DriverDrawBuffer
= mode
;
430 * Set current alpha buffer pointer
432 if (ctx
->DrawBuffer
->UseSoftwareAlphaBuffers
) {
433 if (ctx
->Color
.DriverDrawBuffer
== GL_FRONT_LEFT
)
434 ctx
->DrawBuffer
->Alpha
= ctx
->DrawBuffer
->FrontLeftAlpha
;
435 else if (ctx
->Color
.DriverDrawBuffer
== GL_BACK_LEFT
)
436 ctx
->DrawBuffer
->Alpha
= ctx
->DrawBuffer
->BackLeftAlpha
;
437 else if (ctx
->Color
.DriverDrawBuffer
== GL_FRONT_RIGHT
)
438 ctx
->DrawBuffer
->Alpha
= ctx
->DrawBuffer
->FrontRightAlpha
;
439 else if (ctx
->Color
.DriverDrawBuffer
== GL_BACK_RIGHT
)
440 ctx
->DrawBuffer
->Alpha
= ctx
->DrawBuffer
->BackRightAlpha
;
444 * If we get here there can't have been an error.
445 * Now see if device driver can implement the drawing to the target
446 * buffer(s). The driver may not be able to do GL_FRONT_AND_BACK mode
447 * for example. We'll take care of that in the core code by looping
448 * over the individual buffers.
450 ASSERT(ctx
->Driver
.SetDrawBuffer
);
451 if ( (*ctx
->Driver
.SetDrawBuffer
)(ctx
, ctx
->Color
.DriverDrawBuffer
) ) {
452 /* All OK, the driver will do all buffer writes */
453 ctx
->Color
.MultiDrawBuffer
= GL_FALSE
;
456 /* We'll have to loop over the multiple draw buffer targets */
457 ctx
->Color
.MultiDrawBuffer
= GL_TRUE
;
458 /* Set drawing buffer to front for now */
459 (void) (*ctx
->Driver
.SetDrawBuffer
)(ctx
, GL_FRONT_LEFT
);
462 ctx
->Color
.DrawBuffer
= mode
;
463 ctx
->NewState
|= NEW_RASTER_OPS
;
469 _mesa_ReadBuffer( GLenum mode
)
471 GET_CURRENT_CONTEXT(ctx
);
472 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
, "glReadBuffer");
474 if (MESA_VERBOSE
& VERBOSE_API
)
475 fprintf(stderr
, "glReadBuffer %s\n", gl_lookup_enum_by_nr(mode
));
482 /* AUX buffers not implemented in Mesa at this time */
483 gl_error( ctx
, GL_INVALID_OPERATION
, "glReadBuffer" );
488 /* Front-Left buffer, always exists */
489 ctx
->Pixel
.DriverReadBuffer
= GL_FRONT_LEFT
;
493 /* Back-Left buffer, requires double buffering */
494 if (!ctx
->Visual
->DBflag
) {
495 gl_error( ctx
, GL_INVALID_OPERATION
, "glReadBuffer" );
498 ctx
->Pixel
.DriverReadBuffer
= GL_BACK_LEFT
;
502 if (!ctx
->Visual
->StereoFlag
) {
503 gl_error( ctx
, GL_INVALID_OPERATION
, "glReadBuffer" );
506 ctx
->Pixel
.DriverReadBuffer
= GL_FRONT_RIGHT
;
509 if (!ctx
->Visual
->StereoFlag
|| !ctx
->Visual
->DBflag
) {
510 gl_error( ctx
, GL_INVALID_OPERATION
, "glReadBuffer" );
513 ctx
->Pixel
.DriverReadBuffer
= GL_BACK_RIGHT
;
516 gl_error( ctx
, GL_INVALID_ENUM
, "glReadBuffer" );
520 ctx
->Pixel
.ReadBuffer
= mode
;
521 ctx
->NewState
|= NEW_RASTER_OPS
;
526 * GL_MESA_resize_buffers extension
529 _mesa_ResizeBuffersMESA( void )
531 GLcontext
*ctx
= gl_get_current_context();
533 GLuint buf_width
, buf_height
;
535 if (MESA_VERBOSE
& VERBOSE_API
)
536 fprintf(stderr
, "glResizeBuffersMESA\n");
538 /* ask device driver for size of output buffer */
539 (*ctx
->Driver
.GetBufferSize
)( ctx
, &buf_width
, &buf_height
);
541 /* see if size of device driver's color buffer (window) has changed */
542 if (ctx
->DrawBuffer
->Width
== (GLint
) buf_width
&&
543 ctx
->DrawBuffer
->Height
== (GLint
) buf_height
)
546 ctx
->NewState
|= NEW_RASTER_OPS
; /* to update scissor / window bounds */
548 /* save buffer size */
549 ctx
->DrawBuffer
->Width
= buf_width
;
550 ctx
->DrawBuffer
->Height
= buf_height
;
552 /* Reallocate other buffers if needed. */
553 if (ctx
->DrawBuffer
->UseSoftwareDepthBuffer
) {
554 _mesa_alloc_depth_buffer( ctx
);
556 if (ctx
->DrawBuffer
->UseSoftwareStencilBuffer
) {
557 _mesa_alloc_stencil_buffer( ctx
);
559 if (ctx
->DrawBuffer
->UseSoftwareAccumBuffer
) {
560 _mesa_alloc_accum_buffer( ctx
);
562 if (ctx
->DrawBuffer
->UseSoftwareAlphaBuffers
) {
563 _mesa_alloc_alpha_buffers( ctx
);