1 /* $Id: xmesaP.h,v 1.29 2002/07/09 01:22:52 brianp Exp $ */
4 * Mesa 3-D graphics library
7 * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 # include "GL/xf86glx.h"
34 # include "xf86glx_util.h"
37 # include <X11/extensions/XShm.h>
43 #include "GL/fxmesa.h"
48 extern _glthread_Mutex _xmesa_lock
;
51 /* for PF_8R8G8B24 pixel format */
59 /* Function pointer for clearing color buffers */
60 typedef void (*clear_func
)( GLcontext
*ctx
,
61 GLboolean all
, GLint x
, GLint y
,
62 GLint width
, GLint height
);
66 * "Derived" from GLvisual. Basically corresponds to an XVisualInfo.
69 GLvisual mesa_visual
; /* Device independent visual parameters */
70 XMesaDisplay
*display
; /* The X11 display */
72 GLint screen_depth
; /* The depth of the screen */
74 XVisualInfo
*vishandle
; /* The pointer returned by glXChooseVisual */
76 XMesaVisualInfo visinfo
; /* X's visual info */
77 GLint BitsPerPixel
; /* True bits per pixel for XImages */
79 GLint level
; /* 0=normal, 1=overlay, etc */
80 GLint VisualCaveat
; /* for GLX_EXT_visual_rating extension */
82 GLboolean ximage_flag
; /* Use XImage for back buffer (not pixmap)? */
84 GLuint dithered_pf
; /* Pixel format when dithering */
85 GLuint undithered_pf
; /* Pixel format when not dithering */
87 GLfloat RedGamma
; /* Gamma values, 1.0 is default */
91 GLint rmult
, gmult
, bmult
; /* Range of color values */
92 GLint index_bits
; /* Bits per pixel in CI mode */
94 /* For PF_TRUECOLOR */
95 GLint rshift
, gshift
, bshift
;/* Pixel color component shifts */
96 GLubyte Kernel
[16]; /* Dither kernel */
97 unsigned long RtoPixel
[512]; /* RGB to pixel conversion */
98 unsigned long GtoPixel
[512];
99 unsigned long BtoPixel
[512];
100 GLubyte PixelToR
[256]; /* Pixel to RGB conversion */
101 GLubyte PixelToG
[256];
102 GLubyte PixelToB
[256];
105 short hpcr_rgbTbl
[3][256];
106 GLboolean hpcr_clear_flag
;
107 GLubyte hpcr_clear_ximage_pattern
[2][16];
108 XMesaImage
*hpcr_clear_ximage
;
109 XMesaPixmap hpcr_clear_pixmap
;
118 * "Derived" from __GLcontextRec. Basically corresponds to a GLXContext.
120 struct xmesa_context
{
121 GLcontext
*gl_ctx
; /* the core library context */
122 XMesaVisual xm_visual
; /* Describes the buffers */
123 XMesaBuffer xm_draw_buffer
; /* current draw framebuffer */
124 XMesaBuffer xm_read_buffer
; /* current read framebuffer */
125 XMesaBuffer xm_buffer
; /* current span/point/line/triangle buffer */
127 XMesaDisplay
*display
; /* == xm_visual->display */
128 GLboolean swapbytes
; /* Host byte order != display byte order? */
129 GLboolean direct
; /* Direct rendering context? */
131 GLuint pixelformat
; /* Current pixel format */
133 GLubyte clearcolor
[4]; /* current clearing color */
134 unsigned long clearpixel
; /* current clearing pixel value */
140 WINDOW
, /* An X window */
141 GLXWINDOW
, /* GLX window */
142 PIXMAP
, /* GLX pixmap */
143 PBUFFER
/* GLX Pbuffer */
148 * "Derived" from GLframebuffer. Basically corresponds to a GLXDrawable.
150 struct xmesa_buffer
{
151 GLframebuffer mesa_buffer
; /* depth, stencil, accum, etc buffers */
152 /* This MUST BE FIRST! */
153 GLboolean wasCurrent
; /* was ever the current buffer? */
154 XMesaVisual xm_visual
; /* the X/Mesa visual */
156 XMesaDisplay
*display
;
157 BufferType type
; /* window, pixmap, pbuffer or glxwindow */
158 XMesaDrawable frontbuffer
; /* either a window or pixmap */
159 XMesaPixmap backpixmap
; /* back buffer Pixmap */
160 XMesaImage
*backimage
; /* back buffer simulated XImage */
162 XMesaDrawable buffer
; /* the current buffer, either equal to */
163 /* frontbuffer, backpixmap or XIMAGE (None) */
165 XMesaColormap cmap
; /* the X colormap */
167 GLint db_state
; /* 0 = single buffered */
168 /* BACK_PIXMAP = use Pixmap for back buffer */
169 /* BACK_XIMAGE = use XImage for back buffer */
171 #ifndef XFree86Server
172 GLuint shm
; /* X Shared Memory extension status: */
173 /* 0 = not available */
174 /* 1 = XImage support available */
175 /* 2 = Pixmap support available too */
177 XShmSegmentInfo shminfo
;
181 XMesaImage
*rowimage
; /* Used for optimized span writing */
183 GLuint width
, height
; /* size of buffer */
185 GLint bottom
; /* used for FLIP macro below */
186 GLubyte
*ximage_origin1
; /* used for PIXELADDR1 macro */
188 GLushort
*ximage_origin2
; /* used for PIXELADDR2 macro */
190 GLubyte
*ximage_origin3
; /* used for PIXELADDR3 macro */
192 GLuint
*ximage_origin4
; /* used for PIXELADDR4 macro */
195 XMesaPixmap stipple_pixmap
; /* For polygon stippling */
196 XMesaGC stipple_gc
; /* For polygon stippling */
198 XMesaGC gc
; /* scratch GC for span, line, tri drawing */
199 XMesaGC cleargc
; /* GC for clearing the color buffer */
200 XMesaGC swapgc
; /* GC for swapping the color buffers */
202 /* The following are here instead of in the XMesaVisual
203 * because they depend on the window's colormap.
206 /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
207 unsigned long color_table
[576]; /* RGB -> pixel value */
209 /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
210 GLubyte pixel_to_r
[65536]; /* pixel value -> red */
211 GLubyte pixel_to_g
[65536]; /* pixel value -> green */
212 GLubyte pixel_to_b
[65536]; /* pixel value -> blue */
214 /* Used to do XAllocColor/XFreeColors accounting: */
216 #if defined(XFree86Server)
217 Pixel alloced_colors
[256];
219 unsigned long alloced_colors
[256];
223 /* For 3Dfx Glide only */
224 GLboolean FXisHackUsable
; /* Can we render into window? */
225 GLboolean FXwindowHack
; /* Are we rendering into a window? */
229 /* functions for clearing the front and back color buffers */
230 clear_func front_clear_func
;
231 clear_func back_clear_func
;
233 struct xmesa_buffer
*Next
; /* Linked list pointer: */
238 /* Values for xmesa->dest: */
239 #define FRONT_PIXMAP 1
240 #define BACK_PIXMAP 2
241 #define BACK_XIMAGE 4
244 /* Values for xmesa->pixelformat: */
245 #define PF_INDEX 1 /* Color Index mode */
246 #define PF_TRUECOLOR 2 /* TrueColor or DirectColor, any depth */
247 #define PF_TRUEDITHER 3 /* TrueColor with dithering */
248 #define PF_8A8B8G8R 4 /* 32-bit TrueColor: 8-A, 8-B, 8-G, 8-R */
249 #define PF_8R8G8B 5 /* 32-bit TrueColor: 8-R, 8-G, 8-B bits */
250 #define PF_5R6G5B 6 /* 16-bit TrueColor: 5-R, 6-G, 5-B bits */
251 #define PF_DITHER 7 /* Color-mapped RGB with dither */
252 #define PF_LOOKUP 8 /* Color-mapped RGB without dither */
253 #define PF_HPCR 9 /* HP Color Recovery (ad@lms.be 30/08/95) */
254 #define PF_1BIT 10 /* monochrome dithering of RGB */
255 #define PF_GRAYSCALE 11 /* Grayscale or StaticGray */
256 #define PF_8R8G8B24 12 /* 24-bit TrueColor: 8-R, 8-G, 8-B bits */
257 #define PF_DITHER_5R6G5B 13 /* 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
261 * If pixelformat==PF_TRUECOLOR:
263 #define PACK_TRUECOLOR( PIXEL, R, G, B ) \
264 PIXEL = xmesa->xm_visual->RtoPixel[R] \
265 | xmesa->xm_visual->GtoPixel[G] \
266 | xmesa->xm_visual->BtoPixel[B]; \
270 * If pixelformat==PF_TRUEDITHER:
272 #define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B ) \
274 int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)]; \
275 PIXEL = xmesa->xm_visual->RtoPixel[(R)+d] \
276 | xmesa->xm_visual->GtoPixel[(G)+d] \
277 | xmesa->xm_visual->BtoPixel[(B)+d]; \
283 * If pixelformat==PF_8A8B8G8R:
285 #define PACK_8A8B8G8R( R, G, B, A ) \
286 ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
290 * Like PACK_8A8B8G8R() but don't use alpha. This is usually an acceptable
293 #define PACK_8B8G8R( R, G, B ) ( ((B) << 16) | ((G) << 8) | (R) )
298 * If pixelformat==PF_8R8G8B:
300 #define PACK_8R8G8B( R, G, B) ( ((R) << 16) | ((G) << 8) | (B) )
304 * If pixelformat==PF_5R6G5B:
306 #define PACK_5R6G5B( R, G, B) ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
312 * If pixelformat==PF_DITHER:
314 * Improved 8-bit RGB dithering code contributed by Bob Mercier
315 * (mercier@hollywood.cinenet.net). Thanks Bob!
325 # define _MIX(r,g,b) (((r)*_G+(g))*_B+(b))
330 # define _MIX(r,g,b) ( ((g)<<6) | ((b)<<3) | (r) )
336 /*#define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d))/(_D*256))*/
337 #define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d)) >> 12)
340 static int kernel8
[_DY
*_DX
] = {
341 0 * MAXC
, 8 * MAXC
, 2 * MAXC
, 10 * MAXC
,
342 12 * MAXC
, 4 * MAXC
, 14 * MAXC
, 6 * MAXC
,
343 3 * MAXC
, 11 * MAXC
, 1 * MAXC
, 9 * MAXC
,
344 15 * MAXC
, 7 * MAXC
, 13 * MAXC
, 5 * MAXC
,
348 /* Dither for random X,Y */
349 #define DITHER_SETUP \
351 unsigned long *ctable = xmesa->xm_buffer->color_table;
353 #define DITHER( X, Y, R, G, B ) \
354 (__d = kernel8[(((Y)&3)<<2) | ((X)&3)], \
355 ctable[_MIX(_DITH(_R, (R), __d), \
356 _DITH(_G, (G), __d), \
357 _DITH(_B, (B), __d))])
359 /* Dither for random X, fixed Y */
360 #define XDITHER_SETUP(Y) \
362 unsigned long *ctable = xmesa->xm_buffer->color_table; \
363 int *kernel = &kernel8[ ((Y)&3) << 2 ];
365 #define XDITHER( X, R, G, B ) \
366 (__d = kernel[(X)&3], \
367 ctable[_MIX(_DITH(_R, (R), __d), \
368 _DITH(_G, (G), __d), \
369 _DITH(_B, (B), __d))])
374 * Dithering for flat-shaded triangles. Precompute all 16 possible
375 * pixel values given the triangle's RGB color. Contributed by Martin Shenk.
377 static GLushort DitherValues
[16]; /* array of (up to) 16-bit pixel values */
379 #define FLAT_DITHER_SETUP( R, G, B ) \
381 unsigned long *ctable = xmesa->xm_buffer->color_table; \
382 int msdr = (_D*((_R)-1)+1) * (R); \
383 int msdg = (_D*((_G)-1)+1) * (G); \
384 int msdb = (_D*((_B)-1)+1) * (B); \
386 for (i=0;i<16;i++) { \
387 int k = kernel8[i]; \
388 int j = _MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 ); \
389 DitherValues[i] = (GLushort) ctable[j]; \
393 #define FLAT_DITHER_ROW_SETUP(Y) \
394 GLushort *ditherRow = DitherValues + ( ((Y)&3) << 2);
396 #define FLAT_DITHER(X) ditherRow[(X)&3]
401 * If pixelformat==PF_LOOKUP:
403 #define _DITH0(C,c) (((unsigned)((_D*(C-1)+1)*c)) >> 12)
405 #define LOOKUP_SETUP \
406 unsigned long *ctable = xmesa->xm_buffer->color_table
408 #define LOOKUP( R, G, B ) \
409 ctable[_MIX(_DITH0(_R, (R)), \
416 * If pixelformat==PF_HPCR:
418 * HP Color Recovery dithering (ad@lms.be 30/08/95)
419 * HP has on it's 8-bit 700-series computers, a feature called
420 * 'Color Recovery'. This allows near 24-bit output (so they say).
421 * It is enabled by selecting the 8-bit TrueColor visual AND
422 * corresponding colormap (see tkInitWindow) AND doing some special
425 static const short HPCR_DRGB
[3][2][16] = {
427 { 16, -4, 1,-11, 14, -6, 3, -9, 15, -5, 2,-10, 13, -7, 4, -8},
428 {-15, 5, 0, 12,-13, 7, -2, 10,-14, 6, -1, 11,-12, 8, -3, 9}
431 {-11, 15, -7, 3, -8, 14, -4, 2,-10, 16, -6, 4, -9, 13, -5, 1},
432 { 12,-14, 8, -2, 9,-13, 5, -1, 11,-15, 7, -3, 10,-12, 6, 0}
435 { 6,-18, 26,-14, 2,-22, 30,-10, 8,-16, 28,-12, 4,-20, 32, -8},
436 { -4, 20,-24, 16, 0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10}
440 #define DITHER_HPCR( X, Y, R, G, B ) \
441 ( ((xmesa->xm_visual->hpcr_rgbTbl[0][R] + HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0) \
442 |(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
443 | ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + HPCR_DRGB[2][(Y)&1][(X)&15])>>6) \
449 * If pixelformat==PF_1BIT:
451 static int const kernel1
[16] = {
452 0*47, 9*47, 4*47, 12*47, /* 47 = (255*3)/16 */
453 6*47, 2*47, 14*47, 8*47,
454 10*47, 1*47, 5*47, 11*47,
455 7*47, 13*47, 3*47, 15*47 };
457 #define SETUP_1BIT int bitFlip = xmesa->xm_visual->bitFlip
458 #define DITHER_1BIT( X, Y, R, G, B ) \
459 (( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
464 * If pixelformat==PF_GRAYSCALE:
466 #define GRAY_RGB( R, G, B ) xmesa->xm_buffer->color_table[((R) + (G) + (B))/3]
474 * Converts a GL window Y coord to an X window Y coord:
476 #define FLIP(BUFFER, Y) ((BUFFER)->bottom-(Y))
480 * Return the address of a 1, 2 or 4-byte pixel in the back XImage:
481 * X==0 is left, Y==0 is bottom.
483 #define PIXELADDR1( BUFFER, X, Y ) \
484 ( (BUFFER)->ximage_origin1 - (Y) * (BUFFER)->ximage_width1 + (X) )
486 #define PIXELADDR2( BUFFER, X, Y ) \
487 ( (BUFFER)->ximage_origin2 - (Y) * (BUFFER)->ximage_width2 + (X) )
489 #define PIXELADDR3( BUFFER, X, Y ) \
490 ( (bgr_t *) ( (BUFFER)->ximage_origin3 - (Y) * (BUFFER)->ximage_width3 + 3 * (X) ))
492 #define PIXELADDR4( BUFFER, X, Y ) \
493 ( (BUFFER)->ximage_origin4 - (Y) * (BUFFER)->ximage_width4 + (X) )
498 * External functions:
502 xmesa_color_to_pixel( XMesaContext xmesa
,
503 GLubyte r
, GLubyte g
, GLubyte b
, GLubyte a
,
504 GLuint pixelFormat
);
506 extern void xmesa_alloc_back_buffer( XMesaBuffer b
);
508 extern void xmesa_init_pointers( GLcontext
*ctx
);
509 extern void xmesa_update_state( GLcontext
*ctx
, GLuint new_state
);
511 extern void xmesa_update_span_funcs( GLcontext
*ctx
);
513 /* Plugged into the software rasterizer. Try to use internal
514 * swrast-style point, line and triangle functions.
516 extern void xmesa_choose_point( GLcontext
*ctx
);
517 extern void xmesa_choose_line( GLcontext
*ctx
);
518 extern void xmesa_choose_triangle( GLcontext
*ctx
);
521 extern void xmesa_register_swrast_functions( GLcontext
*ctx
);
525 /* XXX this is a hack to implement shared display lists with 3Dfx */
526 extern XMesaBuffer
XMesaCreateWindowBuffer2( XMesaVisual v
,
532 * These are the extra routines required for integration with XFree86.
533 * None of these routines should be user visible. -KEM
535 extern void XMesaSetVisualDisplay( XMesaDisplay
*dpy
, XMesaVisual v
);
536 extern GLboolean
XMesaForceCurrent(XMesaContext c
);
537 extern GLboolean
XMesaLoseCurrent(XMesaContext c
);
538 extern void XMesaReset( void );
540 extern void xmesa_resize_buffers( GLframebuffer
*buffer
);