Add Glide version.

glide/Makefile

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+# Based on DOS/DJGPP tests makefile for Glide3
+# Initial makefiles:
+#  Copyright (c) 2002 - Borca Daniel
+#  Email : [email protected]
+#  Web   : http://www.geocities.com/dborca
+#
+
+
+.PHONY: all clean
+.SUFFIXES: .c .o .exe
+
+CC = i586-pc-msdosdjgpp-gcc
+CFLAGS = -MMD -Wall -std=gnu99 -O2 -ffast-math -march=i386 -mtune=i586 -fomit-frame-pointer -fgnu89-inline
+CFLAGS += -Iglide3/include
+CFLAGS += -D__DOS__ -DSST1
+CFLAGS += -D__DOS32__
+CCTOOLS = /usr/bin/g++
+
+
+LDFLAGS = -s -Lglide3/lib/
+
+#LDLIBS = -lglide3i
+LDLIBS = -lglide3x
+
+build/%.o: src/%.c
+	$(shell mkdir -p build) 
+	$(CC) -o $@ $(CFLAGS) -c $<
+
+dragon.exe: build/main.o build/geometry.o build/glide_helpers.o build/keyboard.o build/scene.o
+	$(CC) -o $@ $(LDFLAGS) $^ $(LDLIBS)
+
+all: dragon.exe
+
+tools:
+	$(CCTOOLS) -o image_tool resources/tools/image_tool.c
+	$(CCTOOLS) -o mesh_tool resources/tools/mesh_tool.cpp
+
+clean:
+	@echo Cleaning...
+	$(shell rm dragon.exe &> /dev/null) 
+	$(shell rm -r build/ &> /dev/null) 

glide/README.md

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+## Glide version
+
+![](images/glide-1.png)
+
+This version is targeting the Glide API, designed to control 3DFX graphic adapters (such as the Voodoo 1 and the Banshee) under DOS.
+
+The [DJGPP toolchain](https://github.com/andrewwutw/build-djgpp) is used to compile C to the DOS target. The Glide 'driver' is also compiled using the same toolchain from the sources [released online](http://glide.sourceforge.net) and adjusted for compilation with DJGPP by SuperIlu ([repository](https://github.com/SuperIlu/glide)). The version included in the repository is targeting the Voodoo 1 specifically. Documentation for the Glide API can be found on [3dfxarchive.com](https://3dfxarchive.com/reference.htm). For testing, the Voodoo Graphics was emulated using [DOSBox-X](https://dosbox-x.com). 
+
+![](images/glide-2.png)
+
+Vertex transformation and shading is performed on the CPU. Clipping is also performed manually, generating triangle strip lists that are then sent to the graphics adapter. Textures are limited to a 256px resolution, and stored in the RGB565 format ; mipmaps are not used for now. Inputs are handled using a custom interrupt.
+
+![](images/glide-3.png)
+
+
+

glide/glide3/dxe.c

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+#include <sys/dxe.h>
+
+extern_asm(___dj_stderr);
+extern_asm(___dj_stdout);
+extern_asm(___djgpp_base_address);
+extern_asm(___djgpp_nearptr_disable);
+extern_asm(___djgpp_nearptr_enable);
+extern_asm(___dpmi_free_physical_address_mapping);
+extern_asm(___dpmi_physical_address_mapping);
+extern_asm(__crt0_startup_flags);
+extern_asm(_atof);
+extern_asm(_atoi);
+extern_asm(_exit);
+extern_asm(_fclose);
+extern_asm(_fflush);
+extern_asm(_fgetc);
+extern_asm(_fgets);
+extern_asm(_fopen);
+extern_asm(_fprintf);
+extern_asm(_fread);
+extern_asm(_getc);
+extern_asm(_getenv);
+extern_asm(_malloc);
+extern_asm(_memcpy);
+extern_asm(_pow);
+extern_asm(_printf);
+extern_asm(_puts);
+extern_asm(_sprintf);
+extern_asm(_sscanf);
+extern_asm(_strcat);
+extern_asm(_strcmp);
+extern_asm(_strcpy);
+extern_asm(_strlen);
+extern_asm(_strtok);
+extern_asm(_vfprintf);
+
+DXE_EXPORT_TABLE_AUTO (___dxe_eta___glide3x)
+	DXE_EXPORT_ASM (___dj_stderr)
+	DXE_EXPORT_ASM (___dj_stdout)
+	DXE_EXPORT_ASM (___djgpp_base_address)
+	DXE_EXPORT_ASM (___djgpp_nearptr_disable)
+	DXE_EXPORT_ASM (___djgpp_nearptr_enable)
+	DXE_EXPORT_ASM (___dpmi_free_physical_address_mapping)
+	DXE_EXPORT_ASM (___dpmi_physical_address_mapping)
+	DXE_EXPORT_ASM (__crt0_startup_flags)
+	DXE_EXPORT_ASM (_atof)
+	DXE_EXPORT_ASM (_atoi)
+	DXE_EXPORT_ASM (_exit)
+	DXE_EXPORT_ASM (_fclose)
+	DXE_EXPORT_ASM (_fflush)
+	DXE_EXPORT_ASM (_fgetc)
+	DXE_EXPORT_ASM (_fgets)
+	DXE_EXPORT_ASM (_fopen)
+	DXE_EXPORT_ASM (_fprintf)
+	DXE_EXPORT_ASM (_fread)
+	DXE_EXPORT_ASM (_getc)
+	DXE_EXPORT_ASM (_getenv)
+	DXE_EXPORT_ASM (_malloc)
+	DXE_EXPORT_ASM (_memcpy)
+	DXE_EXPORT_ASM (_pow)
+	DXE_EXPORT_ASM (_printf)
+	DXE_EXPORT_ASM (_puts)
+	DXE_EXPORT_ASM (_sprintf)
+	DXE_EXPORT_ASM (_sscanf)
+	DXE_EXPORT_ASM (_strcat)
+	DXE_EXPORT_ASM (_strcmp)
+	DXE_EXPORT_ASM (_strcpy)
+	DXE_EXPORT_ASM (_strlen)
+	DXE_EXPORT_ASM (_strtok)
+	DXE_EXPORT_ASM (_vfprintf)
+DXE_EXPORT_END

glide/glide3/include/3dfx.h

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+/*
+** THIS SOFTWARE IS SUBJECT TO COPYRIGHT PROTECTION AND IS OFFERED ONLY
+** PURSUANT TO THE 3DFX GLIDE GENERAL PUBLIC LICENSE. THERE IS NO RIGHT
+** TO USE THE GLIDE TRADEMARK WITHOUT PRIOR WRITTEN PERMISSION OF 3DFX
+** INTERACTIVE, INC. A COPY OF THIS LICENSE MAY BE OBTAINED FROM THE 
+** DISTRIBUTOR OR BY CONTACTING 3DFX INTERACTIVE INC([email protected]). 
+** THIS PROGRAM IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER 
+** EXPRESSED OR IMPLIED. SEE THE 3DFX GLIDE GENERAL PUBLIC LICENSE FOR A
+** FULL TEXT OF THE NON-WARRANTY PROVISIONS.  
+** 
+** USE, DUPLICATION OR DISCLOSURE BY THE GOVERNMENT IS SUBJECT TO
+** RESTRICTIONS AS SET FORTH IN SUBDIVISION (C)(1)(II) OF THE RIGHTS IN
+** TECHNICAL DATA AND COMPUTER SOFTWARE CLAUSE AT DFARS 252.227-7013,
+** AND/OR IN SIMILAR OR SUCCESSOR CLAUSES IN THE FAR, DOD OR NASA FAR
+** SUPPLEMENT. UNPUBLISHED RIGHTS RESERVED UNDER THE COPYRIGHT LAWS OF
+** THE UNITED STATES.  
+** 
+** COPYRIGHT 3DFX INTERACTIVE, INC. 1999, ALL RIGHTS RESERVED
+*/
+#ifndef __3DFX_H__
+#define __3DFX_H__
+
+/*
+** basic data types
+*/
+typedef unsigned char   FxU8;
+typedef signed   char   FxI8;
+typedef unsigned short  FxU16;
+typedef signed   short  FxI16;
+#if defined(__DOS__) || defined(__MSDOS__) || defined(_WIN32) || defined(macintosh)
+typedef signed   long   FxI32;
+typedef unsigned long   FxU32;
+#else
+typedef signed   int    FxI32;
+typedef unsigned int    FxU32;
+#endif
+typedef unsigned long   AnyPtr;
+typedef int             FxBool;
+typedef float           FxFloat;
+typedef double          FxDouble;
+
+/*
+** color types
+*/
+typedef unsigned long                FxColor_t;
+typedef struct { float r, g, b, a; } FxColor4;
+
+/*
+** fundamental types
+*/
+#define FXTRUE    1
+#define FXFALSE   0
+
+/*
+** helper macros
+*/
+#define FXUNUSED( a ) ((void)(a))
+#define FXBIT( i )    ( 1 << (i) )
+
+/*
+** export macros
+*/
+
+#if defined(__MSC__) || defined(_MSC_VER)
+#  if defined (MSVC16)
+#    define FX_ENTRY 
+#    define FX_CALL
+#  else
+#    define FX_ENTRY extern
+#    define FX_CALL  __stdcall
+#  endif
+#elif defined(__WATCOMC__)
+#  define FX_ENTRY extern
+#  define FX_CALL  __stdcall
+#elif defined (__IBMC__) || defined (__IBMCPP__)
+   /*  IBM Visual Age C/C++: */
+#  define FX_ENTRY extern
+#  define FX_CALL  __stdcall
+#elif defined(__DJGPP__)
+#  define FX_ENTRY extern
+#  define FX_CALL
+#elif defined(__MINGW32__)
+#  define FX_ENTRY extern
+#  define FX_CALL  __stdcall
+#elif defined(__unix__)
+#  define FX_ENTRY extern
+#  define FX_CALL
+#elif defined(__MWERKS__)
+#  if macintosh
+#    define FX_ENTRY extern
+#    define FX_CALL
+#  else /* !macintosh */
+#    error "Unknown MetroWerks target platform"
+#  endif /* !macintosh */
+#else
+#  warning define FX_ENTRY & FX_CALL for your compiler
+#  define FX_ENTRY extern
+#  define FX_CALL
+#endif
+
+/*
+** x86 compiler specific stuff
+*/
+#if defined(__BORLANDC_)
+#  define REALMODE
+
+#  define REGW( a, b ) ((a).x.b)
+#  define REGB( a, b ) ((a).h.b)
+#  define INT86( a, b, c ) int86(a,b,c)
+#  define INT86X( a, b, c, d ) int86x(a,b,c,d)
+
+#  define RM_SEG( a ) FP_SEG( a )
+#  define RM_OFF( a ) FP_OFF( a )
+#elif defined(__WATCOMC__)
+#  undef FP_SEG
+#  undef FP_OFF
+
+#  define REGW( a, b ) ((a).w.b)
+#  define REGB( a, b ) ((a).h.b)
+#  define INT86( a, b, c ) int386(a,b,c)
+#  define INT86X( a, b, c, d ) int386x(a,b,c,d)
+
+#  define RM_SEG( a )  ( ( ( ( FxU32 ) (a) ) & 0x000F0000 ) >> 4 )
+#  define RM_OFF( a )  ( ( FxU16 ) (a) )
+#endif
+
+#endif /* !__3DFX_H__ */