1 /* $Id: xmesaP.h,v 1.34 2003/02/17 16:36:04 brianp Exp $ */
4 * Mesa 3-D graphics library
7 * Copyright (C) 1999-2003 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
; /* Only used in fakeglx.c */
76 XMesaVisualInfo visinfo
; /* X's visual info (pointer to private copy) */
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 /** Current pixel format */
133 PF_Index
, /**< Color Index mode */
134 PF_Truecolor
, /**< TrueColor or DirectColor, any depth */
135 PF_Dither_True
, /**< TrueColor with dithering */
136 PF_8A8B8G8R
, /**< 32-bit TrueColor: 8-A, 8-B, 8-G, 8-R */
137 PF_8R8G8B
, /**< 32-bit TrueColor: 8-R, 8-G, 8-B bits */
138 PF_5R6G5B
, /**< 16-bit TrueColor: 5-R, 6-G, 5-B bits */
139 PF_Dither
, /**< Color-mapped RGB with dither */
140 PF_Lookup
, /**< Color-mapped RGB without dither */
141 PF_HPCR
, /**< HP Color Recovery (ad@lms.be 30/08/95) */
142 PF_1Bit
, /**< monochrome dithering of RGB */
143 PF_Grayscale
, /**< Grayscale or StaticGray */
144 PF_8R8G8B24
, /**< 24-bit TrueColor: 8-R, 8-G, 8-B bits */
145 PF_Dither_5R6G5B
/**< 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
151 GLubyte clearcolor
[4]; /* current clearing color */
152 unsigned long clearpixel
; /* current clearing pixel value */
158 WINDOW
, /* An X window */
159 GLXWINDOW
, /* GLX window */
160 PIXMAP
, /* GLX pixmap */
161 PBUFFER
/* GLX Pbuffer */
166 * "Derived" from GLframebuffer. Basically corresponds to a GLXDrawable.
168 struct xmesa_buffer
{
169 GLframebuffer mesa_buffer
; /* depth, stencil, accum, etc buffers */
170 /* This MUST BE FIRST! */
171 GLboolean wasCurrent
; /* was ever the current buffer? */
172 XMesaVisual xm_visual
; /* the X/Mesa visual */
174 XMesaDisplay
*display
;
175 BufferType type
; /* window, pixmap, pbuffer or glxwindow */
176 XMesaDrawable frontbuffer
; /* either a window or pixmap */
177 XMesaPixmap backpixmap
; /* back buffer Pixmap */
178 XMesaImage
*backimage
; /* back buffer simulated XImage */
180 XMesaDrawable buffer
; /* the current buffer, either equal to */
181 /* frontbuffer, backpixmap or XIMAGE (None) */
183 XMesaColormap cmap
; /* the X colormap */
185 unsigned long selectedEvents
;/* for pbuffers only */
187 GLint db_state
; /* 0 = single buffered */
188 /* BACK_PIXMAP = use Pixmap for back buffer */
189 /* BACK_XIMAGE = use XImage for back buffer */
191 #ifndef XFree86Server
192 GLuint shm
; /* X Shared Memory extension status: */
193 /* 0 = not available */
194 /* 1 = XImage support available */
195 /* 2 = Pixmap support available too */
197 XShmSegmentInfo shminfo
;
201 XMesaImage
*rowimage
; /* Used for optimized span writing */
203 GLuint width
, height
; /* size of buffer */
205 GLint bottom
; /* used for FLIP macro below */
206 GLubyte
*ximage_origin1
; /* used for PIXELADDR1 macro */
208 GLushort
*ximage_origin2
; /* used for PIXELADDR2 macro */
210 GLubyte
*ximage_origin3
; /* used for PIXELADDR3 macro */
212 GLuint
*ximage_origin4
; /* used for PIXELADDR4 macro */
215 XMesaPixmap stipple_pixmap
; /* For polygon stippling */
216 XMesaGC stipple_gc
; /* For polygon stippling */
218 XMesaGC gc
; /* scratch GC for span, line, tri drawing */
219 XMesaGC cleargc
; /* GC for clearing the color buffer */
220 XMesaGC swapgc
; /* GC for swapping the color buffers */
222 /* The following are here instead of in the XMesaVisual
223 * because they depend on the window's colormap.
226 /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
227 unsigned long color_table
[576]; /* RGB -> pixel value */
229 /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
230 GLubyte pixel_to_r
[65536]; /* pixel value -> red */
231 GLubyte pixel_to_g
[65536]; /* pixel value -> green */
232 GLubyte pixel_to_b
[65536]; /* pixel value -> blue */
234 /* Used to do XAllocColor/XFreeColors accounting: */
236 #if defined(XFree86Server)
237 Pixel alloced_colors
[256];
239 unsigned long alloced_colors
[256];
243 /* For 3Dfx Glide only */
244 GLboolean FXisHackUsable
; /* Can we render into window? */
245 GLboolean FXwindowHack
; /* Are we rendering into a window? */
249 /* functions for clearing the front and back color buffers */
250 clear_func front_clear_func
;
251 clear_func back_clear_func
;
253 struct xmesa_buffer
*Next
; /* Linked list pointer: */
258 /* Values for xmesa->dest: */
259 #define FRONT_PIXMAP 1
260 #define BACK_PIXMAP 2
261 #define BACK_XIMAGE 4
265 * If pixelformat==PF_TRUECOLOR:
267 #define PACK_TRUECOLOR( PIXEL, R, G, B ) \
268 PIXEL = xmesa->xm_visual->RtoPixel[R] \
269 | xmesa->xm_visual->GtoPixel[G] \
270 | xmesa->xm_visual->BtoPixel[B]; \
274 * If pixelformat==PF_TRUEDITHER:
276 #define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B ) \
278 int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)]; \
279 PIXEL = xmesa->xm_visual->RtoPixel[(R)+d] \
280 | xmesa->xm_visual->GtoPixel[(G)+d] \
281 | xmesa->xm_visual->BtoPixel[(B)+d]; \
287 * If pixelformat==PF_8A8B8G8R:
289 #define PACK_8A8B8G8R( R, G, B, A ) \
290 ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
294 * Like PACK_8A8B8G8R() but don't use alpha. This is usually an acceptable
297 #define PACK_8B8G8R( R, G, B ) ( ((B) << 16) | ((G) << 8) | (R) )
302 * If pixelformat==PF_8R8G8B:
304 #define PACK_8R8G8B( R, G, B) ( ((R) << 16) | ((G) << 8) | (B) )
308 * If pixelformat==PF_5R6G5B:
310 #define PACK_5R6G5B( R, G, B) ( (((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
316 * If pixelformat==PF_DITHER:
318 * Improved 8-bit RGB dithering code contributed by Bob Mercier
319 * (mercier@hollywood.cinenet.net). Thanks Bob!
325 # define DITH_MIX(r,g,b) (((r) * DITH_G + (g)) * DITH_B + (b))
330 # define DITH_MIX(r,g,b) (((g) << 6) | ((b) << 3) | (r))
334 #define DITH_N (DITH_DX * DITH_DY)
336 /*#define _dither(C,c,d) (((unsigned)((DITH_N*(C-1)+1)*c+d))/(DITH_N*256))*/
337 #define _dither(C, c, d) (((unsigned)((DITH_N * (C - 1) + 1) * c + d)) >> 12)
340 static int kernel8
[DITH_DY
* DITH_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
,
347 /* Dither for random X,Y */
348 #define DITHER_SETUP \
350 unsigned long *ctable = xmesa->xm_buffer->color_table;
352 #define DITHER( X, Y, R, G, B ) \
353 (__d = kernel8[(((Y)&3)<<2) | ((X)&3)], \
354 ctable[DITH_MIX(_dither(DITH_R, (R), __d), \
355 _dither(DITH_G, (G), __d), \
356 _dither(DITH_B, (B), __d))])
358 /* Dither for random X, fixed Y */
359 #define XDITHER_SETUP(Y) \
361 unsigned long *ctable = xmesa->xm_buffer->color_table; \
362 int *kernel = &kernel8[ ((Y)&3) << 2 ];
364 #define XDITHER( X, R, G, B ) \
365 (__d = kernel[(X)&3], \
366 ctable[DITH_MIX(_dither(DITH_R, (R), __d), \
367 _dither(DITH_G, (G), __d), \
368 _dither(DITH_B, (B), __d))])
373 * Dithering for flat-shaded triangles. Precompute all 16 possible
374 * pixel values given the triangle's RGB color. Contributed by Martin Shenk.
376 static GLushort DitherValues
[16]; /* array of (up to) 16-bit pixel values */
378 #define FLAT_DITHER_SETUP( R, G, B ) \
380 unsigned long *ctable = xmesa->xm_buffer->color_table; \
381 int msdr = (DITH_N*((DITH_R)-1)+1) * (R); \
382 int msdg = (DITH_N*((DITH_G)-1)+1) * (G); \
383 int msdb = (DITH_N*((DITH_B)-1)+1) * (B); \
385 for (i=0;i<16;i++) { \
386 int k = kernel8[i]; \
387 int j = DITH_MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 ); \
388 DitherValues[i] = (GLushort) ctable[j]; \
392 #define FLAT_DITHER_ROW_SETUP(Y) \
393 GLushort *ditherRow = DitherValues + ( ((Y)&3) << 2);
395 #define FLAT_DITHER(X) ditherRow[(X)&3]
400 * If pixelformat==PF_LOOKUP:
402 #define _dither_lookup(C, c) (((unsigned)((DITH_N * (C - 1) + 1) * c)) >> 12)
404 #define LOOKUP_SETUP \
405 unsigned long *ctable = xmesa->xm_buffer->color_table
407 #define LOOKUP( R, G, B ) \
408 ctable[DITH_MIX(_dither_lookup(DITH_R, (R)), \
409 _dither_lookup(DITH_G, (G)), \
410 _dither_lookup(DITH_B, (B)))]
415 * If pixelformat==PF_HPCR:
417 * HP Color Recovery dithering (ad@lms.be 30/08/95)
418 * HP has on it's 8-bit 700-series computers, a feature called
419 * 'Color Recovery'. This allows near 24-bit output (so they say).
420 * It is enabled by selecting the 8-bit TrueColor visual AND
421 * corresponding colormap (see tkInitWindow) AND doing some special
424 static const short HPCR_DRGB
[3][2][16] = {
426 { 16, -4, 1,-11, 14, -6, 3, -9, 15, -5, 2,-10, 13, -7, 4, -8},
427 {-15, 5, 0, 12,-13, 7, -2, 10,-14, 6, -1, 11,-12, 8, -3, 9}
430 {-11, 15, -7, 3, -8, 14, -4, 2,-10, 16, -6, 4, -9, 13, -5, 1},
431 { 12,-14, 8, -2, 9,-13, 5, -1, 11,-15, 7, -3, 10,-12, 6, 0}
434 { 6,-18, 26,-14, 2,-22, 30,-10, 8,-16, 28,-12, 4,-20, 32, -8},
435 { -4, 20,-24, 16, 0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10}
439 #define DITHER_HPCR( X, Y, R, G, B ) \
440 ( ((xmesa->xm_visual->hpcr_rgbTbl[0][R] + HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0) \
441 |(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
442 | ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + HPCR_DRGB[2][(Y)&1][(X)&15])>>6) \
448 * If pixelformat==PF_1BIT:
450 static int const kernel1
[16] = {
451 0*47, 9*47, 4*47, 12*47, /* 47 = (255*3)/16 */
452 6*47, 2*47, 14*47, 8*47,
453 10*47, 1*47, 5*47, 11*47,
454 7*47, 13*47, 3*47, 15*47 };
456 #define SETUP_1BIT int bitFlip = xmesa->xm_visual->bitFlip
457 #define DITHER_1BIT( X, Y, R, G, B ) \
458 (( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
463 * If pixelformat==PF_GRAYSCALE:
465 #define GRAY_RGB( R, G, B ) xmesa->xm_buffer->color_table[((R) + (G) + (B))/3]
473 * Converts a GL window Y coord to an X window Y coord:
475 #define FLIP(BUFFER, Y) ((BUFFER)->bottom-(Y))
479 * Return the address of a 1, 2 or 4-byte pixel in the back XImage:
480 * X==0 is left, Y==0 is bottom.
482 #define PIXELADDR1( BUFFER, X, Y ) \
483 ( (BUFFER)->ximage_origin1 - (Y) * (BUFFER)->ximage_width1 + (X) )
485 #define PIXELADDR2( BUFFER, X, Y ) \
486 ( (BUFFER)->ximage_origin2 - (Y) * (BUFFER)->ximage_width2 + (X) )
488 #define PIXELADDR3( BUFFER, X, Y ) \
489 ( (bgr_t *) ( (BUFFER)->ximage_origin3 - (Y) * (BUFFER)->ximage_width3 + 3 * (X) ))
491 #define PIXELADDR4( BUFFER, X, Y ) \
492 ( (BUFFER)->ximage_origin4 - (Y) * (BUFFER)->ximage_width4 + (X) )
497 * External functions:
501 xmesa_color_to_pixel( XMesaContext xmesa
,
502 GLubyte r
, GLubyte g
, GLubyte b
, GLubyte a
,
503 GLuint pixelFormat
);
505 extern void xmesa_alloc_back_buffer( XMesaBuffer b
);
507 extern void xmesa_init_pointers( GLcontext
*ctx
);
508 extern void xmesa_update_state( GLcontext
*ctx
, GLuint new_state
);
510 extern void xmesa_update_span_funcs( GLcontext
*ctx
);
512 /* Plugged into the software rasterizer. Try to use internal
513 * swrast-style point, line and triangle functions.
515 extern void xmesa_choose_point( GLcontext
*ctx
);
516 extern void xmesa_choose_line( GLcontext
*ctx
);
517 extern void xmesa_choose_triangle( GLcontext
*ctx
);
520 extern void xmesa_register_swrast_functions( GLcontext
*ctx
);
524 /* XXX this is a hack to implement shared display lists with 3Dfx */
525 extern XMesaBuffer
XMesaCreateWindowBuffer2( XMesaVisual v
,
531 * These are the extra routines required for integration with XFree86.
532 * None of these routines should be user visible. -KEM
534 extern void XMesaSetVisualDisplay( XMesaDisplay
*dpy
, XMesaVisual v
);
535 extern GLboolean
XMesaForceCurrent(XMesaContext c
);
536 extern GLboolean
XMesaLoseCurrent(XMesaContext c
);
537 extern void XMesaReset( void );
539 extern void xmesa_resize_buffers( GLframebuffer
*buffer
);