/* $Id: xmesaP.h,v 1.8 2000/02/25 20:36:03 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
*
* Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef XMESAP_H
#define XMESAP_H
#ifdef XFree86Server
# include "GL/xf86glx.h"
# include "xf86glx_util.h"
#else
# ifdef GLX_DIRECT_RENDERING
# include "dri_mesa.h"
# endif
# ifdef USE_XSHM
# include <X11/extensions/XShm.h>
# endif
#endif
#include "GL/xmesa.h"
#include "types.h"
#if defined(FX) && !defined(GLX_DIRECT_RENDERING)
#include "GL/fxmesa.h"
#include "../FX/fxdrv.h"
#endif
#if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
# include "xdriP.h"
#else
# define DRI_DRAWABLE_ARG
# define DRI_DRAWABLE_PARM
# define DRI_CTX_ARG
#endif
/* for PF_8R8G8B24 pixel format */
typedef struct {
GLubyte b;
GLubyte g;
GLubyte r;
} bgr_t;
/* Function pointer for clearing color buffers */
typedef void (*clear_func)( GLcontext *ctx,
GLboolean all, GLint x, GLint y,
GLint width, GLint height );
/*
* "Derived" from gl_visual. Basically corresponds to an XVisualInfo.
*/
struct xmesa_visual {
GLvisual *gl_visual; /* Device independent visual parameters */
XMesaDisplay *display; /* The X11 display */
#ifdef XFree86Server
GLint screen_depth; /* The depth of the screen */
#else
XVisualInfo *vishandle; /* The pointer returned by glXChooseVisual */
#endif
XMesaVisualInfo visinfo; /* X's visual info */
GLint BitsPerPixel; /* True bits per pixel for XImages */
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;/* Pixel color component shifts */
GLubyte Kernel[16]; /* Dither kernel */
unsigned long RtoPixel[512]; /* RGB to pixel conversion */
unsigned long GtoPixel[512];
unsigned long BtoPixel[512];
GLubyte PixelToR[256]; /* Pixel to RGB conversion */
GLubyte PixelToG[256];
GLubyte PixelToB[256];
/* For PF_HPCR */
short hpcr_rgbTbl[3][256];
GLboolean hpcr_clear_flag;
GLubyte hpcr_clear_ximage_pattern[2][16];
XMesaImage *hpcr_clear_ximage;
XMesaPixmap hpcr_clear_pixmap;
/* For PF_1BIT */
int bitFlip;
};
/*
* "Derived" from gl_context. Basically corresponds to a GLXContext.
*/
struct xmesa_context {
GLcontext *gl_ctx; /* the core library context */
XMesaVisual xm_visual; /* Describes the buffers */
XMesaBuffer xm_buffer; /* current draw framebuffer */
XMesaBuffer xm_read_buffer; /* current read framebuffer */
GLboolean use_read_buffer; /* read from the xm_read_buffer/ */
XMesaDisplay *display; /* == xm_visual->display */
GLboolean swapbytes; /* Host byte order != display byte order? */
GLboolean direct; /* Direct rendering context? */
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 */
#if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
__DRIcontextPrivate *driContextPriv; /* back pointer to DRI context
* used for locking
*/
void *private; /* device-specific private context */
#endif
};
/*
* "Derived" from gl_buffer. Basically corresponds to a GLXDrawable.
*/
struct xmesa_buffer {
GLboolean wasCurrent; /* was ever the current buffer? */
GLframebuffer *gl_buffer; /* depth, stencil, accum, etc buffers */
XMesaVisual xm_visual; /* the X/Mesa visual */
XMesaContext xm_context; /* the context associated with this buffer */
XMesaDisplay *display;
GLboolean pixmap_flag; /* is the buffer a Pixmap? */
XMesaDrawable frontbuffer; /* either a window or pixmap */
XMesaPixmap backpixmap; /* back buffer Pixmap */
XMesaImage *backimage; /* back buffer simulated XImage */
XMesaDrawable buffer; /* the current buffer, either equal to */
/* frontbuffer, backpixmap or XIMAGE (None) */
XMesaColormap cmap; /* the X colormap */
GLint db_state; /* 0 = single buffered */
/* BACK_PIXMAP = use Pixmap for back buffer */
/* BACK_XIMAGE = use XImage for back buffer */
#ifndef XFree86Server
GLuint shm; /* X Shared Memory extension status: */
/* 0 = not available */
/* 1 = XImage support available */
/* 2 = Pixmap support available too */
#ifdef USE_XSHM
XShmSegmentInfo shminfo;
#endif
#endif
XMesaImage *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;
GLubyte *ximage_origin3; /* used for PIXELADDR3 macro */
GLint ximage_width3;
GLuint *ximage_origin4; /* used for PIXELADDR4 macro */
GLint ximage_width4;
XMesaPixmap stipple_pixmap; /* For polygon stippling */
XMesaGC stipple_gc; /* For polygon stippling */
XMesaGC gc1; /* GC for infrequent color changes */
XMesaGC gc2; /* GC for frequent color changes */
XMesaGC 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 */
/* Used to do XAllocColor/XFreeColors accounting: */
int num_alloced;
unsigned long alloced_colors[256];
#if defined(GLX_DIRECT_RENDERING) && !defined(XFree86Server)
__DRIdrawablePrivate *driDrawPriv; /* back pointer to DRI drawable
* used for direct access to framebuffer
*/
void *private; /* device-specific private drawable */
#endif
#if defined( FX ) && !defined(GLX_DIRECT_RENDERING)
/* For 3Dfx Glide only */
GLboolean FXisHackUsable; /* Can we render into window? */
GLboolean FXwindowHack; /* Are we rendering into a window? */
fxMesaContext FXctx;
#endif
/* functions for clearing the front and back color buffers */
clear_func front_clear_func;
clear_func back_clear_func;
struct xmesa_buffer *Next; /* Linked list pointer: */
};
/* 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_TRUEDITHER 3 /* TrueColor with dithering */
#define PF_8A8B8G8R 4 /* 32-bit TrueColor: 8-A, 8-B, 8-G, 8-R */
#define PF_8R8G8B 5 /* 32-bit TrueColor: 8-R, 8-G, 8-B bits */
#define PF_5R6G5B 6 /* 16-bit TrueColor: 5-R, 6-G, 5-B bits */
#define PF_DITHER 7 /* Color-mapped RGB with dither */
#define PF_LOOKUP 8 /* Color-mapped RGB without dither */
#define PF_HPCR 9 /* HP Color Recovery (ad@lms.be 30/08/95) */
#define PF_1BIT 10 /* monochrome dithering of RGB */
#define PF_GRAYSCALE 11 /* Grayscale or StaticGray */
#define PF_8R8G8B24 12 /* 24-bit TrueColor: 8-R, 8-G, 8-B bits */
#define PF_DITHER_5R6G5B 13 /* 16-bit dithered TrueColor: 5-R, 6-G, 5-B */
/*
* If pixelformat==PF_TRUECOLOR:
*/
#define PACK_TRUECOLOR( PIXEL, R, G, B ) \
PIXEL = xmesa->xm_visual->RtoPixel[R] \
| xmesa->xm_visual->GtoPixel[G] \
| xmesa->xm_visual->BtoPixel[B]; \
/*
* If pixelformat==PF_TRUEDITHER:
*/
#define PACK_TRUEDITHER( PIXEL, X, Y, R, G, B ) \
{ \
int d = xmesa->xm_visual->Kernel[((X)&3) | (((Y)&3)<<2)]; \
PIXEL = xmesa->xm_visual->RtoPixel[(R)+d] \
| xmesa->xm_visual->GtoPixel[(G)+d] \
| xmesa->xm_visual->BtoPixel[(B)+d]; \
}
/*
* If pixelformat==PF_8A8B8G8R:
*/
#define PACK_8A8B8G8R( R, G, B, A ) \
( ((A) << 24) | ((B) << 16) | ((G) << 8) | (R) )
/*
* Like PACK_8A8B8G8R() but don't use alpha. This is usually an acceptable
* shortcut.
*/
#define PACK_8B8G8R( R, G, B ) ( ((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) & 0xf8) << 8) | (((G) & 0xfc) << 3) | ((B) >> 3) )
/*
* If pixelformat==PF_DITHER:
*
* Improved 8-bit RGB dithering code contributed by Bob Mercier
* (mercier@hollywood.cinenet.net). Thanks Bob!
*/
#undef _R
#undef _G
#undef _B
#undef _D
#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] = (GLushort) 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_DRGB[3][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}
},
{
{-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}
},
{
{ 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_rgbTbl[0][R] + HPCR_DRGB[0][(Y)&1][(X)&15]) & 0xE0) \
|(((xmesa->xm_visual->hpcr_rgbTbl[1][G] + HPCR_DRGB[1][(Y)&1][(X)&15]) & 0xE0)>>3) \
| ((xmesa->xm_visual->hpcr_rgbTbl[2][B] + HPCR_DRGB[2][(Y)&1][(X)&15])>>6) \
)
/*
* If pixelformat==PF_1BIT:
*/
static int const kernel1[16] = {
0*47, 9*47, 4*47, 12*47, /* 47 = (255*3)/16 */
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 SETUP_1BIT int bitFlip = xmesa->xm_visual->bitFlip
#define DITHER_1BIT( X, Y, R, G, B ) \
(( ((int)(R)+(int)(G)+(int)(B)) > kernel1[(((Y)&3) << 2) | ((X)&3)] ) ^ bitFlip)
/*
* If pixelformat==PF_GRAYSCALE:
*/
#define GRAY_RGB( R, G, B ) xmesa->xm_buffer->color_table[((R) + (G) + (B))/3]
#define XIMAGE None
/*
* Converts a GL window Y coord to an X window Y coord:
*/
#define FLIP(BUFFER, Y) ((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( BUFFER, X, Y ) \
( (BUFFER)->ximage_origin1 - (Y) * (BUFFER)->ximage_width1 + (X) )
#define PIXELADDR2( BUFFER, X, Y ) \
( (BUFFER)->ximage_origin2 - (Y) * (BUFFER)->ximage_width2 + (X) )
#define PIXELADDR3( BUFFER, X, Y ) \
( (bgr_t *) ( (BUFFER)->ximage_origin3 - (Y) * (BUFFER)->ximage_width3 + 3 * (X) ))
#define PIXELADDR4( BUFFER, X, Y ) \
( (BUFFER)->ximage_origin4 - (Y) * (BUFFER)->ximage_width4 + (X) )
/*
* 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_update_state( GLcontext *ctx );
extern points_func xmesa_get_points_func( GLcontext *ctx );
extern line_func xmesa_get_line_func( GLcontext *ctx );
extern triangle_func xmesa_get_triangle_func( GLcontext *ctx );
/* XXX this is a hack to implement shared display lists with 3Dfx */
extern XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v,
XMesaWindow w,
XMesaContext c
DRI_DRAWABLE_ARG
);
/*
* These are the extra routines required for integration with XFree86.
* None of these routines should be user visible. -KEM
*/
extern void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v );
extern GLboolean XMesaForceCurrent(XMesaContext c);
extern GLboolean XMesaLoseCurrent(XMesaContext c);
extern void XMesaReset( void );
#endif