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+/* $Id: xmesaP.h,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.1
+ *
+ * Copyright (C) 1999 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 "xf86glx_util.h"
+#else
+#ifdef SHM
+#include <X11/extensions/XShm.h>
+#endif
+#endif
+#include "GL/xmesa.h"
+#include "types.h"
+#ifdef FX
+#include "GL/fxmesa.h"
+#include "../FX/fxdrv.h"
+#endif
+
+
+/* for PF_8R8G8B24 pixel format */
+typedef struct {
+ GLubyte b;
+ GLubyte g;
+ GLubyte r;
+} bgr_t;
+
+
+/*
+ * "Derived" from gl_visual. Basically corresponds to an XVisualInfo.
+ */
+struct xmesa_visual {
+ GLvisual *gl_visual; /* Device independent visual parameters */
+ XMesaDisplay *display; /* The X11 display */
+#ifndef XFree86Server
+ XVisualInfo *vishandle; /* The pointer returned by glXChooseVisual */
+#endif
+ XMesaVisualInfo visinfo; /* X's visual info */
+
+ 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 framebuffer */
+
+ 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 */
+};
+
+
+
+/*
+ * "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 SHM
+ 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;
+ bgr_t *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];
+
+#ifdef FX
+ /* For 3Dfx Glide only */
+ GLboolean FXisHackUsable; /* Can we render into window? */
+ GLboolean FXwindowHack; /* Are we rendering into a window? */
+ fxMesaContext FXctx;
+#endif
+
+ 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
+#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(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 PIXELADDR3( X, Y ) \
+ ( xmesa->xm_buffer->ximage_origin3 - (Y) * xmesa->xm_buffer->ximage_width3 + (X) )
+
+#define PIXELADDR4( X, Y ) \
+ ( xmesa->xm_buffer->ximage_origin4 - (Y) * xmesa->xm_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 );
+
+
+/*
+ * 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
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