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- /* $Id: xmesaP.h,v 1.10 1997/01/31 23:44:24 brianp Exp $ */
-
- /*
- * Mesa 3-D graphics library
- * Version: 2.2
- * Copyright (C) 1995-1997 Brian Paul
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-
- /*
- * $Log: xmesaP.h,v $
- * Revision 1.10 1997/01/31 23:44:24 brianp
- * added FLAT_DITHER macros inspired by code from Martin Schenk (schenkm@ping.at)
- *
- * Revision 1.9 1997/01/31 20:41:20 brianp
- * added vishandle to xmesa_visual struct
- *
- * Revision 1.8 1997/01/08 20:54:02 brianp
- * added DITHER666 option from Michael Pichler
- *
- * Revision 1.7 1996/10/22 02:54:35 brianp
- * incorporated Jacques Leroy's changes to DITHER_HPCR macro
- *
- * Revision 1.6 1996/10/22 02:50:46 brianp
- * new DITHER_SETUP, XDITHER_SETUP and XDITHER macros
- * _MIX macro now uses shifts and ORs instead of mults and adds
- *
- * Revision 1.5 1996/09/27 17:10:20 brianp
- * added index_bits field to XMesaVisual struct
- *
- * Revision 1.4 1996/09/27 01:32:12 brianp
- * changed kernel1 array from 2-D to 1-D
- *
- * Revision 1.3 1996/09/19 03:16:04 brianp
- * new X/Mesa interface with XMesaContext, XMesaVisual, and XMesaBuffer types
- *
- * Revision 1.2 1996/09/15 14:22:13 brianp
- * now use GLframebuffer and GLvisual
- *
- * Revision 1.1 1996/09/13 01:38:16 brianp
- * Initial revision
- *
- */
-
-
- #ifndef XMESAP_H
- #define XMESAP_H
-
-
- #ifdef SHM
- # include <X11/extensions/XShm.h>
- #endif
- #include "GL/xmesa.h"
- #include "types.h"
-
-
-
- /*
- * Mesa wrapper for XVisualInfo
- */
- struct xmesa_visual {
- GLvisual *gl_visual; /* Device independent visual parameters */
- Display *display; /* The X11 display */
- XVisualInfo *vishandle; /* The pointer returned by glXChooseVisual */
- XVisualInfo *visinfo; /* Private copy of vishandle's struct */
-
- GLint level; /* 0=normal, 1=overlay, etc */
-
- GLboolean ximage_flag; /* Use XImage for back buffer (not pixmap)? */
-
- GLuint dithered_pf; /* Pixel format when dithering */
- GLuint undithered_pf; /* Pixel format when not dithering */
-
- GLfloat RedGamma; /* Gamma values, 1.0 is default */
- GLfloat GreenGamma;
- GLfloat BlueGamma;
-
- GLint rmult, gmult, bmult; /* Range of color values */
- GLint index_bits; /* Bits per pixel in CI mode */
-
- /* For PF_TRUECOLOR */
- GLint rshift, gshift, bshift; /* Bit shifts */
- unsigned long r_to_pixel[256]; /* Converts red to pixel bits */
- unsigned long g_to_pixel[256]; /* Converts green to pixel bits */
- unsigned long b_to_pixel[256]; /* Converts blue to pixel bits */
-
- /* For PF_HPCR */
- short hpcr_rTbl[256], hpcr_gTbl[256], hpcr_bTbl[256];
- };
-
-
-
- /*
- * Mesa wrapper for core rendering context
- */
- struct xmesa_context {
- GLcontext *gl_ctx; /* the core library context */
- XMesaVisual xm_visual; /* Describes the buffers */
- XMesaBuffer xm_buffer; /* current framebuffer */
-
- Display *display; /* == xm_visual->display */
- GLboolean swapbytes; /* Host byte order != display byte order? */
-
- GLuint pixelformat; /* Current pixel format */
-
- GLubyte red, green, blue, alpha;/* current drawing color */
- unsigned long pixel; /* current drawing pixel value */
-
- GLubyte clearcolor[4]; /* current clearing color */
- unsigned long clearpixel; /* current clearing pixel value */
- };
-
-
-
- /*
- * Mesa wrapper for X window or Pixmap
- */
- struct xmesa_buffer {
- GLframebuffer *gl_buffer;/* depth, stencil, accum, etc buffers */
- XMesaVisual xm_visual; /* the X/Mesa visual */
-
- GLboolean pixmap_flag; /* is the buffer a Pixmap? */
- Drawable frontbuffer; /* either a window or pixmap */
- Pixmap backpixmap; /* back buffer Pixmap */
- XImage *backimage; /* back buffer XImage */
-
- Drawable buffer; /* the current buffer, either equal to */
- /* frontbuffer, backpixmap or XIMAGE (None) */
-
- Colormap cmap; /* the X colormap */
-
- GLint db_state; /* 0 = single buffered */
- /* BACK_PIXMAP = use Pixmap for back buffer */
- /* BACK_XIMAGE = use XImage for back buffer */
-
- GLuint shm; /* X Shared Memory extension status: */
- /* 0 = not available */
- /* 1 = XImage support available */
- /* 2 = Pixmap support available too */
- #ifdef SHM
- XShmSegmentInfo shminfo;
- #endif
-
- XImage *rowimage; /* Used for optimized span writing */
-
- GLuint width, height; /* size of buffer */
-
- GLint bottom; /* used for FLIP macro below */
- GLubyte *ximage_origin1; /* used for PIXELADDR1 macro */
- GLint ximage_width1;
- GLushort *ximage_origin2; /* used for PIXELADDR2 macro */
- GLint ximage_width2;
- GLuint *ximage_origin4; /* used for PIXELADDR4 macro */
- GLint ximage_width4;
-
- Pixmap stipple_pixmap; /* For polygon stippling */
- GC stipple_gc; /* For polygon stippling */
- XImage *stipple_ximage; /* For polygon stippling */
-
- GC gc1; /* GC for infrequent color changes */
- GC gc2; /* GC for frequent color changes */
- GC cleargc; /* GC for clearing the color buffer */
-
- /* The following are here instead of in the XMesaVisual
- * because they depend on the window's colormap.
- */
-
- /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
- unsigned long color_table[576]; /* RGB -> pixel value */
-
- /* For PF_DITHER, PF_LOOKUP, PF_GRAYSCALE */
- GLubyte pixel_to_r[65536]; /* pixel value -> red */
- GLubyte pixel_to_g[65536]; /* pixel value -> green */
- GLubyte pixel_to_b[65536]; /* pixel value -> blue */
- };
-
-
-
- /* Values for xmesa->dest: */
- #define FRONT_PIXMAP 1
- #define BACK_PIXMAP 2
- #define BACK_XIMAGE 4
-
-
- /* Values for xmesa->pixelformat: */
- #define PF_INDEX 1 /* Color Index mode */
- #define PF_TRUECOLOR 2 /* TrueColor or DirectColor, any depth */
- #define PF_8A8B8G8R 3 /* 32-bit TrueColor: 8-A, 8-B, 8-G, 8-R */
- #define PF_8R8G8B 4 /* 32-bit TrueColor: 8-R, 8-G, 8-B */
- #define PF_5R6G5B 5 /* 16-bit TrueColor: 5-R, 6-G, 5-B bits */
- #define PF_DITHER 6 /* Dithered RGB using a lookup table */
- #define PF_LOOKUP 7 /* Undithered RGB using a lookup table */
- #define PF_HPCR 8 /* HP Color Recovery (ad@lms.be 30/08/95) */
- #define PF_1BIT 9 /* monochrome dithering of RGB */
- #define PF_GRAYSCALE 10 /* Grayscale or StaticGray */
-
-
-
- /*
- * If pixelformat==PF_TRUECOLOR:
- */
- #define PACK_RGB( R, G, B ) \
- (xmesa->xm_visual->r_to_pixel[R] | xmesa->xm_visual->g_to_pixel[G] | xmesa->xm_visual->b_to_pixel[B])
-
-
- /*
- * If pixelformat==PF_8A8B8G8R:
- */
- #define PACK_8A8B8G8R( R, G, B, A ) \
- ( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
-
-
- /*
- * If pixelformat==PF_8R8G8B:
- */
- #define PACK_8R8G8B( R, G, B) ( ((R) << 16) | ((G) << 8) | (B) )
-
-
- /*
- * If pixelformat==PF_5R6G5B:
- */
- #define PACK_5R6G5B( R, G, B) ( ((R) << 11) | ((G) << 5) | (B) )
-
-
-
- /*
- * If pixelformat==PF_DITHER:
- *
- * Improved 8-bit RGB dithering code contributed by Bob Mercier
- * (mercier@hollywood.cinenet.net). Thanks Bob!
- */
- #ifdef DITHER666
- # define _R 6
- # define _G 6
- # define _B 6
- # define _MIX(r,g,b) (((r)*_G+(g))*_B+(b))
- #else
- # define _R 5
- # define _G 9
- # define _B 5
- # define _MIX(r,g,b) ( ((g)<<6) | ((b)<<3) | (r) )
- #endif
- #define _DX 4
- #define _DY 4
- #define _D (_DX*_DY)
-
- /*#define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d))/(_D*256))*/
- #define _DITH(C,c,d) (((unsigned)((_D*(C-1)+1)*c+d)) >> 12)
-
- #define MAXC 256
- static int kernel8[_DY*_DX] = {
- 0 * MAXC, 8 * MAXC, 2 * MAXC, 10 * MAXC,
- 12 * MAXC, 4 * MAXC, 14 * MAXC, 6 * MAXC,
- 3 * MAXC, 11 * MAXC, 1 * MAXC, 9 * MAXC,
- 15 * MAXC, 7 * MAXC, 13 * MAXC, 5 * MAXC,
- };
- /*static int __d;*/
-
- /* Dither for random X,Y */
- #define DITHER_SETUP \
- int __d; \
- unsigned long *ctable = xmesa->xm_buffer->color_table;
-
- #define DITHER( X, Y, R, G, B ) \
- (__d = kernel8[(((Y)&3)<<2) | ((X)&3)], \
- ctable[_MIX(_DITH(_R, (R), __d), \
- _DITH(_G, (G), __d), \
- _DITH(_B, (B), __d))])
-
- /* Dither for random X, fixed Y */
- #define XDITHER_SETUP(Y) \
- int __d; \
- unsigned long *ctable = xmesa->xm_buffer->color_table; \
- int *kernel = &kernel8[ ((Y)&3) << 2 ];
-
- #define XDITHER( X, R, G, B ) \
- (__d = kernel[(X)&3], \
- ctable[_MIX(_DITH(_R, (R), __d), \
- _DITH(_G, (G), __d), \
- _DITH(_B, (B), __d))])
-
-
- /*
- * Dithering for flat-shaded triangles. Precompute all 16 possible
- * pixel values given the triangle's RGB color. Contributed by Martin Shenk.
- */
- static GLushort DitherValues[16]; /* array of (up to) 16-bit pixel values */
-
- #define FLAT_DITHER_SETUP( R, G, B ) \
- { \
- unsigned long *ctable = xmesa->xm_buffer->color_table; \
- int msdr = (_D*((_R)-1)+1) * (R); \
- int msdg = (_D*((_G)-1)+1) * (G); \
- int msdb = (_D*((_B)-1)+1) * (B); \
- int i; \
- for (i=0;i<16;i++) { \
- int k = kernel8[i]; \
- int j = _MIX( (msdr+k)>>12, (msdg+k)>>12, (msdb+k)>>12 ); \
- DitherValues[i] = ctable[j]; \
- } \
- }
-
- #define FLAT_DITHER_ROW_SETUP(Y) \
- GLushort *ditherRow = DitherValues + ( ((Y)&3) << 2);
-
- #define FLAT_DITHER(X) ditherRow[(X)&3]
-
-
-
- /*
- * If pixelformat==PF_LOOKUP:
- */
- #define _DITH0(C,c) (((unsigned)((_D*(C-1)+1)*c)) >> 12)
-
- #define LOOKUP_SETUP \
- unsigned long *ctable = xmesa->xm_buffer->color_table
-
- #define LOOKUP( R, G, B ) \
- ctable[_MIX(_DITH0(_R, (R)), \
- _DITH0(_G, (G)), \
- _DITH0(_B, (B)))]
-
-
-
- /*
- * If pixelformat==PF_HPCR:
- *
- * HP Color Recovery dithering (ad@lms.be 30/08/95)
- * HP has on it's 8-bit 700-series computers, a feature called
- * 'Color Recovery'. This allows near 24-bit output (so they say).
- * It is enabled by selecting the 8-bit TrueColor visual AND
- * corresponding colormap (see tkInitWindow) AND doing some special
- * dither.
- */
- static const short HPCR_DR[2][16] = {
- { 16, -4, 1,-11, 14, -6, 3, -9, 15, -5, 2,-10, 13, -7, 4, -8},
- {-15, 5, 0, 12,-13, 7, -2, 10,-14, 6, -1, 11,-12, 8, -3, 9} };
- static const short HPCR_DG[2][16] = {
- {-11, 15, -7, 3, -8, 14, -4, 2,-10, 16, -6, 4, -9, 13, -5, 1},
- { 12,-14, 8, -2, 9,-13, 5, -1, 11,-15, 7, -3, 10,-12, 6, 0} };
- static const short HPCR_DB[2][16] = {
- { 6,-18, 26,-14, 2,-22, 30,-10, 8,-16, 28,-12, 4,-20, 32, -8},
- { -4, 20,-24, 16, 0, 24,-28, 12, -6, 18,-26, 14, -2, 22,-30, 10} };
-
- #define DITHER_HPCR( X, Y, R, G, B ) \
- ( ((xmesa->xm_visual->hpcr_rTbl[R] + HPCR_DR[(Y)&1][(X)&15]) & 0xE0) \
- |(((xmesa->xm_visual->hpcr_gTbl[G] + HPCR_DG[(Y)&1][(X)&15]) & 0xE0)>>3) \
- | ((xmesa->xm_visual->hpcr_bTbl[B] + HPCR_DB[(Y)&1][(X)&15])>>6) \
- )
-
-
-
- /*
- * If pixelformat==PF_1BIT:
- */
- static int const kernel1[16] = {
- 0*47, 9*47, 4*47, 12*47,
- 6*47, 2*47, 14*47, 8*47,
- 10*47, 1*47, 5*47, 11*47,
- 7*47, 13*47, 3*47, 15*47 };
-
- #define DITHER_1BIT( X, Y, R, G, B ) \
- ( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(((Y)&3) << 2) | ((X)&3)] )
-
-
-
- /*
- * If pixelformat==PF_GRAYSCALE:
- */
- #define GRAY_RGB( R, G, B ) xmesa->xm_buffer->color_table[(R) + (G) + (B)]
-
-
-
- #define XIMAGE None
-
-
- /*
- * Converts a GL window Y coord to an X window Y coord:
- */
- #define FLIP(Y) (xmesa->xm_buffer->bottom-(Y))
-
-
- /*
- * Return the address of a 1, 2 or 4-byte pixel in the back XImage:
- * X==0 is left, Y==0 is bottom.
- */
- #define PIXELADDR1( X, Y ) \
- ( xmesa->xm_buffer->ximage_origin1 - (Y) * xmesa->xm_buffer->ximage_width1 + (X) )
-
- #define PIXELADDR2( X, Y ) \
- ( xmesa->xm_buffer->ximage_origin2 - (Y) * xmesa->xm_buffer->ximage_width2 + (X) )
-
- #define PIXELADDR4( X, Y ) \
- ( xmesa->xm_buffer->ximage_origin4 - (Y) * xmesa->xm_buffer->ximage_width4 + (X) )
-
-
-
- /*
- * External variables:
- */
- extern XMesaContext XMesa;
-
-
-
- /*
- * External functions:
- */
-
- extern unsigned long xmesa_color_to_pixel( XMesaContext xmesa,
- GLubyte r, GLubyte g, GLubyte b, GLubyte a );
-
- extern void xmesa_alloc_back_buffer( XMesaBuffer b );
-
- extern void xmesa_setup_DD_pointers( GLcontext *ctx );
-
- extern points_func xmesa_get_points_func( GLcontext *ctx );
-
- extern line_func xmesa_get_line_func( GLcontext *ctx );
-
- extern polygon_func xmesa_get_polygon_func( GLcontext *ctx );
-
- extern triangle_func xmesa_get_triangle_func( GLcontext *ctx );
-
-
-
- #endif
-