# HG changeset patch # User John Tsiombikas # Date 1321848841 -7200 # Node ID f04884489bad18f2e14b604d614296c99b188f87 dos3d initial import diff -r 000000000000 -r f04884489bad .hgignore --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.hgignore Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,4 @@ +\.o$ +\.obj$ +\.d$ +^test$ diff -r 000000000000 -r f04884489bad COPYING --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/COPYING Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff -r 000000000000 -r f04884489bad Makefile --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Makefile Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,21 @@ +obj = src/test.o \ + src/mingl.o src/mglrast.o src/mglgen.o \ + dosemu/dosemu.o +dep = $(obj:.o=.d) +bin = test + +CC = gcc +CFLAGS = -pedantic -Wall -g `pkg-config --cflags sdl` -Isrc -Idosemu +LDFLAGS = `pkg-config --libs sdl` + +$(bin): $(obj) + $(CC) -o $@ $(obj) $(LDFLAGS) + +-include $(dep) + +%.d: %.c + @$(CPP) $(CFLAGS) $< -MM -MT $(@:.d=.o) >$@ + +.PHONY: clean +clean: + rm -f $(obj) $(bin) diff -r 000000000000 -r f04884489bad Makefile.bcc --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Makefile.bcc Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,25 @@ +.AUTODEPEND + +obj = src\test.obj src\vga.obj src\timer.obj src\mouse.obj \ + src\mingl.obj src\mglrast.obj src\mglgen.obj +bin = dos3d.exe + +CC = bcc + +# 286 instructions, large memory model +CFLAGS = -1 -f287 -ml -O -G -Isrc + +$(bin): $(obj) + $(CC) @&&| +$(CFLAGS) -e$@ +$(obj) +| + +.SUFFIXES: .c .obj + +.c.obj: + $(CC) $(CFLAGS) -o$@ -c $< + +clean: + del src\*.obj + del $(bin) diff -r 000000000000 -r f04884489bad README --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/README Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,17 @@ +A short trip back in time in the days of 16bit graphics programming for MS-DOS +in VGA mode 13h. + +Copyright (C) 2011 John Tsiombikas +Feel free to use, modify and redistribute this code under the terms of the GNU +General Public License version 3 (or at your option any later version published +by the free software foundation). See COPYING for details. + +interesting source code files: +- mingl.c: quick & dirty 256-color renderer with a vaguely GL-like interface. +- vga.c: denthoresque vga mode 13h driver. +- timer.c: DOS timer and 8254 code. + +To compile this you need Borland C, any version should do. Just type make. + +Special thanks to the vim project for providing a DOS version of vim, without it +this would be much less enjoyable. diff -r 000000000000 -r f04884489bad dosemu/conio.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dosemu/conio.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,7 @@ +#ifndef CONIO_H_ +#define CONIO_H_ + +int kbhit(void); +char getch(void); + +#endif /* CONIO_H_ */ diff -r 000000000000 -r f04884489bad dosemu/dosemu.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/dosemu/dosemu.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,221 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ + +/* This file implements all calls made to dos-specific code using SDL + * Don't ask why ... + */ + +#include +#include +#include +#include "vga.h" +#include "conio.h" +#include "mouse.h" +#include "timer.h" + +static void proc_events(void); + +/* ----- graphics (vga.c implementation) ----- */ +static SDL_Surface *fbsurf; + +#define DOUBLESZ (fbsurf->w != 320) + +void set_video_mode(int mode) +{ + int resx = 320, resy = 200; + + if(getenv("DOSEMU_DOUBLESIZE")) { + resx *= 2; + resy *= 2; + } + + switch(mode) { + case 0x13: + SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER); + if(!(fbsurf = SDL_SetVideoMode(resx, resy, 8, SDL_HWPALETTE))) { + fprintf(stderr, "failed to set video mode\n"); + abort(); + } + SDL_ShowCursor(0); + break; + + case 3: + SDL_ShowCursor(1); + SDL_Quit(); + break; + + default: + break; + } +} + +void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b) +{ + SDL_Color col; + col.r = r; + col.g = g; + col.b = b; + + if(SDL_SetPalette(fbsurf, SDL_LOGPAL | SDL_PHYSPAL, &col, c, 1) != 1) { + fprintf(stderr, "set_palette failed to set the required color\n"); + } +} + +void copy_frame(unsigned char *frame) +{ + if(SDL_MUSTLOCK(fbsurf)) { + SDL_LockSurface(fbsurf); + } + + if(DOUBLESZ) { + int i, j; + Uint16 *dest = fbsurf->pixels; + + for(i=0; i<200; i++) { + for(j=0; j<320; j++) { + Uint16 twopix = ((Uint16)*frame << 8) | (Uint16)*frame; + dest[j] = dest[j + 320] = twopix; + frame++; + } + dest += fbsurf->pitch; + } + } else { + memcpy(fbsurf->pixels, frame, 64000); + } + + if(SDL_MUSTLOCK(fbsurf)) { + SDL_UnlockSurface(fbsurf); + } + SDL_Flip(fbsurf); +} + +void wait_vsync(void) +{ +} + +/* ----- event handling (conio.h) ----- */ +static SDL_Event *keybev; +static int mousex, mousey, bnmask; + +int kbhit(void) +{ + if(!keybev) { + proc_events(); + } + return keybev != 0; +} + +char getch(void) +{ + char res; + + while(!keybev) { + SDL_Event ev; + SDL_WaitEvent(&ev); + SDL_PushEvent(&ev); + proc_events(); + } + res = keybev->key.keysym.sym; + keybev = 0; + return res; +} + +/* mouse handling (mouse.c implementation) */ +int have_mouse(void) +{ + return 1; +} + +int read_mouse(int *xp, int *yp) +{ + if(xp) *xp = mousex; + if(yp) *yp = mousey; + return bnmask; +} + +static void proc_events(void) +{ + static SDL_Event ev; + + while(SDL_PollEvent(&ev)) { + switch(ev.type) { + case SDL_KEYDOWN: + keybev = &ev; + return; + + case SDL_MOUSEMOTION: + mousex = ev.motion.x; + mousey = ev.motion.y; + + if(DOUBLESZ) { + mousex /= 2; + mousey /= 2; + } + break; + + case SDL_MOUSEBUTTONDOWN: + case SDL_MOUSEBUTTONUP: + { + int mask = 0; + switch(ev.button.button) { + case SDL_BUTTON_LEFT: + mask = MOUSE_LEFT; + break; + case SDL_BUTTON_MIDDLE: + mask = MOUSE_MIDDLE; + break; + case SDL_BUTTON_RIGHT: + mask = MOUSE_RIGHT; + default: + break; + } + if(!mask) { + break; + } + + if(ev.button.state == SDL_PRESSED) { + bnmask |= mask; + } else { + bnmask &= ~mask; + } + } + break; + + default: + break; + } + } +} + +/* ---- timer.c implementation ---- */ +static Uint32 start_time; + +void init_timer(int res_hz) +{ + reset_timer(); +} + +void reset_timer(void) +{ + start_time = SDL_GetTicks(); +} + +unsigned long get_msec(void) +{ + return (unsigned long)(SDL_GetTicks() - start_time); +} diff -r 000000000000 -r f04884489bad src/mglgen.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mglgen.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,167 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#include +#include +#include "mingl.h" + + +void mgl_cube(float sz) +{ + float hsz = sz * 0.5; + + mgl_begin(MGL_QUADS); + /* front */ + mgl_normal(0, 0, 1); + mgl_vertex3f(-hsz, hsz, hsz); + mgl_vertex3f(-hsz, -hsz, hsz); + mgl_vertex3f(hsz, -hsz, hsz); + mgl_vertex3f(hsz, hsz, hsz); + /* back */ + mgl_normal(0, 0, -1); + mgl_vertex3f(hsz, hsz, -hsz); + mgl_vertex3f(hsz, -hsz, -hsz); + mgl_vertex3f(-hsz, -hsz, -hsz); + mgl_vertex3f(-hsz, hsz, -hsz); + /* right */ + mgl_normal(1, 0, 0); + mgl_vertex3f(hsz, hsz, hsz); + mgl_vertex3f(hsz, -hsz, hsz); + mgl_vertex3f(hsz, -hsz, -hsz); + mgl_vertex3f(hsz, hsz, -hsz); + /* left */ + mgl_normal(-1, 0, 0); + mgl_vertex3f(-hsz, hsz, -hsz); + mgl_vertex3f(-hsz, -hsz, -hsz); + mgl_vertex3f(-hsz, -hsz, hsz); + mgl_vertex3f(-hsz, hsz, hsz); + /* top */ + mgl_normal(0, 1, 0); + mgl_vertex3f(-hsz, hsz, -hsz); + mgl_vertex3f(-hsz, hsz, hsz); + mgl_vertex3f(hsz, hsz, hsz); + mgl_vertex3f(hsz, hsz, -hsz); + /* bottom */ + mgl_normal(0, -1, 0); + mgl_vertex3f(hsz, -hsz, -hsz); + mgl_vertex3f(hsz, -hsz, hsz); + mgl_vertex3f(-hsz, -hsz, hsz); + mgl_vertex3f(-hsz, -hsz, -hsz); + mgl_end(); +} + +void mgl_sphere(float rad, int usub, int vsub) +{ + mgl_sphere_part(rad, usub, vsub, 1.0, 1.0); +} + +#define sphere_vertex(u, v) \ + do { \ + float x, y, z, theta, phi; \ + float costheta, sinphi; \ + theta = (u) * 2.0 * M_PI; \ + phi = (v) * M_PI; \ + costheta = cos(theta); \ + sinphi = sin(phi); \ + x = costheta * sinphi; \ + y = cos(phi); \ + z = sin(theta) * sinphi; \ + mgl_normal(x, y, z); \ + mgl_texcoord2f(u, v); \ + mgl_vertex3f(rad * x, rad * y, rad * z); \ + } while(0) + +void mgl_sphere_part(float rad, int usub, int vsub, float umax, float vmax) +{ + int i, j; + float u, v, du, dv; + + assert(usub > 2); + assert(vsub > 2); + + du = umax / (float)usub; + dv = vmax / (float)vsub; + + mgl_begin(MGL_QUADS); + + u = 0.0; + for(i=0; i 2); + assert(vsub > 2); + + du = umax / (float)usub; + dv = (vmax - vmin) / (float)vsub; + + mgl_begin(MGL_QUADS); + + u = 0.0; + for(i=0; i + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#ifndef MGL_IMPL_H_ +#define MGL_IMPL_H_ + +#define MATRIX_STACK_SIZE 8 +#define MAX_LIGHTS 4 + +#define ROUND(x) ((x) >= 0.0 ? (x) + 0.5 : (x) - 0.5) + +typedef struct { + float x, y, z, w; +} vec4_t; + +typedef struct { + float x, y, z; +} vec3_t; + +typedef struct { + float x, y; +} vec2_t; + +typedef float mat4_t[16]; + +struct vertex { + vec4_t pos; + vec3_t norm; + vec2_t tc; + float energy; + int cidx; +}; + +struct state { + unsigned int flags; + int ord, frontface, cullface; + int mmode, mtop[2]; + mat4_t matrix[2][MATRIX_STACK_SIZE]; + int prim; + struct vertex curv, v[4]; + int vidx; + int vp[4]; /* viewport */ + int col_range; /* color interpolation range */ + vec3_t ldir[MAX_LIGHTS]; + float lint[MAX_LIGHTS]; +}; + +struct framebuffer { + int width, height; + unsigned char *pixels; + unsigned short **zbuf; /* zbuffer broken in 64k tiles */ +}; + +int mgl_rast_init(struct state *state, struct framebuffer *fbuf); +void mgl_rast_cleanup(void); +void mgl_rast_prepare(void); +void mgl_draw_point(struct vertex *v); +void mgl_draw_line(struct vertex *v0, struct vertex *v1); +void mgl_draw_poly(struct vertex *v, int numv); + +#endif /* MGL_IMPL_H_ */ diff -r 000000000000 -r f04884489bad src/mglrast.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mglrast.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,163 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#include +#include +#include +#include +#include "mingl.h" +#include "mglimpl.h" + + +static struct vertex *vleft, *vright; +static struct framebuffer *fb; +static struct state *st; + + +#define SCAN_EDGE scan_edge_flat +#define SCAN_LINE scan_line_flat +#undef INTERP_DEPTH +#undef INTERP_ENERGY +#include "scantmpl.h" +#undef SCAN_EDGE +#undef SCAN_LINE + +#define SCAN_EDGE scan_edge_z +#define SCAN_LINE scan_line_z +#define INTERP_DEPTH +#undef INTERP_ENERGY +#include "scantmpl.h" +#undef SCAN_EDGE +#undef SCAN_LINE + +#define SCAN_EDGE scan_edge_e +#define SCAN_LINE scan_line_e +#undef INTERP_DEPTH +#define INTERP_ENERGY +#include "scantmpl.h" +#undef SCAN_EDGE +#undef SCAN_LINE + +#define SCAN_EDGE scan_edge_ze +#define SCAN_LINE scan_line_ze +#define INTERP_DEPTH +#define INTERP_ENERGY +#include "scantmpl.h" +#undef SCAN_EDGE +#undef SCAN_LINE + +static void (*scan_edge)(struct vertex*, struct vertex*); +static void (*scan_line)(int, unsigned char*); + +int mgl_rast_init(struct state *state, struct framebuffer *fbuf) +{ + fb = fbuf; + st = state; + + if(!(vleft = malloc(fb->height * sizeof *vleft))) { + return -1; + } + if(!(vright = malloc(fb->height * sizeof *vright))) { + free(vleft); + return -1; + } + + scan_edge = scan_edge_flat; + scan_line = scan_line_flat; + + return 0; +} + +void mgl_rast_cleanup(void) +{ + free(vleft); + free(vright); +} + +void mgl_rast_prepare(void) +{ + static void (*sedge[])(struct vertex*, struct vertex*) = { + scan_edge_flat, /* 00 */ + scan_edge_z, /* 01 */ + scan_edge_e, /* 10 */ + scan_edge_ze /* 11 */ + }; + static void (*sline[])(int, unsigned char*) = { + scan_line_flat, /* 00 */ + scan_line_z, /* 01 */ + scan_line_e, /* 10 */ + scan_line_ze /* 11 */ + }; + int bits = 0; + + if(st->flags & MGL_SMOOTH) { + bits |= 2; + } + if((st->flags & MGL_DEPTH_TEST) && fb->zbuf) { + bits |= 1; + } + + scan_edge = sedge[bits]; + scan_line = sline[bits]; +} + +void mgl_draw_point(struct vertex *v) +{ + int x = (int)ROUND(v->pos.x); + int y = (int)ROUND(v->pos.y); + + if(x >= 0 && x < fb->width && y >= 0 && y < fb->height) { + int cidx = v->cidx + v->energy * st->col_range; + fb->pixels[y * fb->width + x] = cidx; + } +} + +void mgl_draw_line(struct vertex *v0, struct vertex *v1) +{ + /* TODO */ + fprintf(stderr, "draw_line unimplemented\n"); + abort(); +} + +void mgl_draw_poly(struct vertex *v, int numv) +{ + int ybeg, yend, i; + unsigned char *sline; + + ybeg = fb->height; + yend = 0; + + for(i=0; ipos.y); + + scan_edge(v0, v1); + + if(y > yend) yend = y; + if(y < ybeg) ybeg = y; + } + + if(ybeg < 0) ybeg = 0; + if(yend >= fb->height) yend = fb->height - 1; + + sline = fb->pixels + ybeg * fb->width; + for(i=ybeg; iwidth; + } +} diff -r 000000000000 -r f04884489bad src/mingl.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mingl.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,466 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#include +#include +#include +#include +#include +#include "mingl.h" +#include "mglimpl.h" + +#define DOT(a, b) ((a).x * (b).x + (a).y * (b).y + (a).z * (b).z) + +static void transform(vec4_t *res, vec4_t *v, float *mat); +static void transform3(vec3_t *res, vec3_t *v, float *mat); +static void vertex_proc(struct vertex *vert); + +static struct state st; +static struct framebuffer fb; + +int mgl_init(int width, int height) +{ + int i; + + st.flags = 0; + st.mmode = 0; + + mgl_front_face(MGL_CCW); + mgl_cull_face(MGL_BACK); + + st.curv.cidx = 0; + st.curv.energy = 1.0; + st.curv.norm.x = st.curv.norm.y = st.curv.norm.z = 0.0; + + if(!(fb.pixels = malloc(width * height))) { + return -1; + } + fb.width = width; + fb.height = height; + fb.zbuf = 0; + + if(mgl_rast_init(&st, &fb) == -1) { + free(fb.pixels); + return -1; + } + + st.mtop[0] = st.mtop[1] = 0; + + mgl_matrix_mode(MGL_MODELVIEW); + mgl_load_identity(); + mgl_matrix_mode(MGL_PROJECTION); + mgl_load_identity(); + + /* initial viewport in the size of the framebuffer */ + st.vp[0] = st.vp[1] = 0; + st.vp[2] = width; + st.vp[3] = height; + + st.col_range = 256; + for(i=0; i= 0 && ltidx < MAX_LIGHTS); + st.lint[ltidx] = intens; +} + +void mgl_light_direction(int ltidx, float x, float y, float z) +{ + vec3_t dir; + float mag; + assert(ltidx >= 0 && ltidx < MAX_LIGHTS); + + dir.x = x; + dir.y = y; + dir.z = z; + transform3(&st.ldir[ltidx], &dir, st.matrix[MGL_MODELVIEW][st.mtop[MGL_MODELVIEW]]); + + mag = sqrt(DOT(st.ldir[ltidx], st.ldir[ltidx])); + if(fabs(mag) < 1e-6) { + mag = 1.0f; + } + st.ldir[ltidx].x /= mag; + st.ldir[ltidx].y /= mag; + st.ldir[ltidx].z /= mag; +} + +void mgl_begin(int prim) +{ + st.prim = prim; + st.vidx = 0; + + st.ord = st.frontface; + if(st.cullface == MGL_FRONT) { + st.ord = st.frontface == MGL_CCW ? MGL_CW : MGL_CCW; + } + + /* select the correct rasterizer according to state */ + mgl_rast_prepare(); +} + +void mgl_end(void) +{ +} + +void mgl_vertex2f(float x, float y) +{ + mgl_vertex4f(x, y, 0.0f, 1.0f); +} + +void mgl_vertex3f(float x, float y, float z) +{ + mgl_vertex4f(x, y, z, 1.0f); +} + +void mgl_vertex4f(float x, float y, float z, float w) +{ + st.v[st.vidx].pos.x = x; + st.v[st.vidx].pos.y = y; + st.v[st.vidx].pos.z = z; + st.v[st.vidx].pos.w = w; + st.v[st.vidx].cidx = st.curv.cidx; + st.v[st.vidx].energy = st.curv.energy; + st.v[st.vidx].norm = st.curv.norm; + st.v[st.vidx].tc = st.curv.tc; + + vertex_proc(st.v + st.vidx); + + if(++st.vidx >= st.prim) { + switch(st.prim) { + case MGL_POINTS: + mgl_draw_point(st.v); + break; + case MGL_LINES: + mgl_draw_line(st.v, st.v + 1); + break; + case MGL_TRIANGLES: + case MGL_QUADS: + mgl_draw_poly(st.v, st.prim); + break; + default: + fprintf(stderr, "invalid primitive: %d\n", st.prim); + abort(); + } + st.vidx = 0; + } +} + +void mgl_color1f(float energy) +{ + st.curv.energy = energy; +} + +void mgl_index(int c) +{ + st.curv.cidx = c; +} + +void mgl_normal(float x, float y, float z) +{ + st.curv.norm.x = x; + st.curv.norm.y = y; + st.curv.norm.z = z; +} + +void mgl_texcoord2f(float x, float y) +{ + st.curv.tc.x = x; + st.curv.tc.y = y; +} + +static void transform(vec4_t *res, vec4_t *v, float *mat) +{ + res->x = mat[0] * v->x + mat[4] * v->y + mat[8] * v->z + mat[12] * v->w; + res->y = mat[1] * v->x + mat[5] * v->y + mat[9] * v->z + mat[13] * v->w; + res->z = mat[2] * v->x + mat[6] * v->y + mat[10] * v->z + mat[14] * v->w; + res->w = mat[3] * v->x + mat[7] * v->y + mat[11] * v->z + mat[15] * v->w; +} + +/* the matrix is 4x4 (16 floats), just ignoring anything out of the 3x3 */ +static void transform3(vec3_t *res, vec3_t *v, float *mat) +{ + res->x = mat[0] * v->x + mat[4] * v->y + mat[8] * v->z; + res->y = mat[1] * v->x + mat[5] * v->y + mat[9] * v->z; + res->z = mat[2] * v->x + mat[6] * v->y + mat[10] * v->z; +} + +static void vertex_proc(struct vertex *vert) +{ + vec4_t pview, pclip; + + float *mvmat = st.matrix[MGL_MODELVIEW][st.mtop[MGL_MODELVIEW]]; + float *pmat = st.matrix[MGL_PROJECTION][st.mtop[MGL_PROJECTION]]; + + /* modelview transformation */ + transform(&pview, &vert->pos, mvmat); + + if(st.flags & MGL_LIGHTING) { + if((st.flags & MGL_SMOOTH) || st.vidx == 0) { + int i; + vec3_t norm; + float irrad = 0.0f; + + transform3(&norm, &vert->norm, mvmat); + + for(i=0; i 1e-6f) { + float ndotl = DOT(norm, st.ldir[i]); + if(ndotl < 0.0) { + ndotl = 0.0; + } + irrad += ndotl * st.lint[i]; + } + } + vert->energy = irrad; + } else { + vert->energy = st.v[0].energy; + } + } + + transform(&pclip, &pview, pmat); + /* TODO clipping in homogenous clip space */ + + if(pclip.w < 1e-6 && pclip.w > -1e-6) { + vert->pos.x = vert->pos.y = vert->pos.z = vert->pos.w = 0.0f; + return; + } + + /* perspective division */ + vert->pos.x = pclip.x / pclip.w; + vert->pos.y = pclip.y / pclip.w; + vert->pos.z = pclip.z / pclip.w; + vert->pos.w = pclip.w; + + /* viewport transformation */ + vert->pos.x = st.vp[0] + st.vp[2] * (vert->pos.x * 0.5 + 0.5); + vert->pos.y = st.vp[1] + st.vp[3] * (-vert->pos.y * 0.5 + 0.5); +} + +void mgl_viewport(int x, int y, int width, int height) +{ + st.vp[0] = x; + st.vp[1] = y; + st.vp[2] = width; + st.vp[3] = height; +} + +void mgl_matrix_mode(int mmode) +{ + st.mmode = mmode; +} + +void mgl_push_matrix(void) +{ + float *topmat; + if(st.mtop[st.mmode] >= MATRIX_STACK_SIZE - 1) { + fprintf(stderr, "mgl_push_matrix: stack overflow\n"); + abort(); + } + + topmat = st.matrix[st.mmode][st.mtop[st.mmode]]; + memcpy(topmat + 16, topmat, 16 * sizeof *topmat); + st.mmode++; +} + +void mgl_pop_matrix(void) +{ + if(st.mtop[st.mmode] <= 0) { + fprintf(stderr, "mgl_pop_matrix: stack underflow\n"); + abort(); + } + st.mtop[st.mmode]--; +} + +void mgl_load_matrix(float *mat) +{ + float *dest = st.matrix[st.mmode][st.mtop[st.mmode]]; + memcpy(dest, mat, 16 * sizeof *dest); +} + +#define M(i,j) (((j) << 2) + (i)) +void mgl_mult_matrix(float *m2) +{ + int i, j; + float m1[16]; + float *dest = st.matrix[st.mmode][st.mtop[st.mmode]]; + + memcpy(m1, dest, sizeof m1); + + for(i=0; i<4; i++) { + for(j=0; j<4; j++) { + dest[M(i,j)] = m1[M(0,j)] * m2[M(i,0)] + + m1[M(1,j)] * m2[M(i,1)] + + m1[M(2,j)] * m2[M(i,2)] + + m1[M(3,j)] * m2[M(i,3)]; + } + } +} + +void mgl_load_identity(void) +{ + static float id[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}; + mgl_load_matrix((float*)id); +} + +void mgl_translate(float x, float y, float z) +{ + float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}; + xform[12] = x; + xform[13] = y; + xform[14] = z; + mgl_mult_matrix(xform); +} + +void mgl_rotate(float deg, float x, float y, float z) +{ + float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}; + + float angle = M_PI * deg / 180.0f; + float sina = sin(angle); + float cosa = cos(angle); + float one_minus_cosa = 1.0f - cosa; + float nxsq = x * x; + float nysq = y * y; + float nzsq = z * z; + + xform[0] = nxsq + (1.0f - nxsq) * cosa; + xform[4] = x * y * one_minus_cosa - z * sina; + xform[8] = x * z * one_minus_cosa + y * sina; + xform[1] = x * y * one_minus_cosa + z * sina; + xform[5] = nysq + (1.0 - nysq) * cosa; + xform[9] = y * z * one_minus_cosa - x * sina; + xform[2] = x * z * one_minus_cosa - y * sina; + xform[6] = y * z * one_minus_cosa + x * sina; + xform[10] = nzsq + (1.0 - nzsq) * cosa; + + mgl_mult_matrix(xform); +} + +void mgl_scale(float x, float y, float z) +{ + float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}; + xform[0] = x; + xform[5] = y; + xform[10] = z; + mgl_mult_matrix(xform); +} + +void gl_ortho(float left, float right, float bottom, float top, float nr, float fr) +{ + float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}; + + float dx = right - left; + float dy = top - bottom; + float dz = fr - nr; + + float tx = -(right + left) / dx; + float ty = -(top + bottom) / dy; + float tz = -(fr + nr) / dz; + + float sx = 2.0 / dx; + float sy = 2.0 / dy; + float sz = -2.0 / dz; + + xform[0] = sx; + xform[5] = sy; + xform[10] = sz; + xform[12] = tx; + xform[13] = ty; + xform[14] = tz; + + mgl_mult_matrix(xform); +} + +void mgl_frustum(float left, float right, float bottom, float top, float nr, float fr) +{ + float xform[] = {1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1}; + + float dx = right - left; + float dy = top - bottom; + float dz = fr - nr; + + float a = (right + left) / dx; + float b = (top + bottom) / dy; + float c = -(fr + nr) / dz; + float d = -2.0 * fr * nr / dz; + + xform[0] = 2.0 * nr / dx; + xform[5] = 2.0 * nr / dy; + xform[8] = a; + xform[9] = b; + xform[10] = c; + xform[11] = -1.0f; + xform[14] = d; + + mgl_mult_matrix(xform); +} + +void mgl_perspective(float vfov, float aspect, float nr, float fr) +{ + float vfov_rad = M_PI * vfov / 180.0; + float x = nr * tan(vfov_rad / 2.0); + mgl_frustum(-aspect * x, aspect * x, -x, x, nr, fr); +} diff -r 000000000000 -r f04884489bad src/mingl.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mingl.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,95 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#ifndef MINGL_H_ +#define MINGL_H_ + +/* enable bitflags */ +#define MGL_CULL_FACE 1 +#define MGL_DEPTH_TEST 2 +#define MGL_SMOOTH 4 +#define MGL_LIGHTING 8 + +/* primitives */ +#define MGL_POINTS 1 +#define MGL_LINES 2 +#define MGL_TRIANGLES 3 +#define MGL_QUADS 4 + +/* matrices */ +#define MGL_MODELVIEW 0 +#define MGL_PROJECTION 1 +#define MGL_TEXTURE 2 + +#define MGL_FRONT 0 +#define MGL_BACK 1 + +#define MGL_CCW 0 +#define MGL_CW 1 + +int mgl_init(int width, int height); +void mgl_free(void); + +unsigned char *mgl_framebuffer(void); + +void mgl_clear(int cidx); + +void mgl_enable(unsigned int bit); +void mgl_disable(unsigned int bit); + +void mgl_front_face(int ff); +void mgl_cull_face(int cf); + +void mgl_color_range(int rng); +void mgl_light_intensity(int ltidx, float intens); +void mgl_light_direction(int ltidx, float x, float y, float z); + +void mgl_begin(int prim); +void mgl_end(void); + +void mgl_vertex2f(float x, float y); +void mgl_vertex3f(float x, float y, float z); +void mgl_vertex4f(float x, float y, float z, float w); +void mgl_color1f(float energy); +void mgl_index(int cidx); +void mgl_normal(float x, float y, float z); +void mgl_texcoord2f(float x, float y); + +void mgl_viewport(int x, int y, int width, int height); + +void mgl_matrix_mode(int mmode); +void mgl_push_matrix(void); +void mgl_pop_matrix(void); +void mgl_load_matrix(float *mat); +void mgl_mult_matrix(float *mat); +void mgl_load_identity(void); + +void mgl_translate(float x, float y, float z); +void mgl_rotate(float angle, float x, float y, float z); +void mgl_scale(float x, float y, float z); + +void mgl_ortho(float left, float right, float bottom, float top, float nr, float fr); +void mgl_frustum(float left, float right, float bottom, float top, float nr, float fr); +void mgl_perspective(float vfov, float aspect, float nr, float fr); + +void mgl_cube(float sz); +void mgl_sphere(float rad, int usub, int vsub); +void mgl_sphere_part(float rad, int usub, int vsub, float umax, float vmax); +void mgl_torus(float inner, float outer, int usub, int vsub); +void mgl_torus_part(float inner, float outer, int usub, int vsub, float umax, float vmin, float vmax); + +#endif /* MINGL_H_ */ diff -r 000000000000 -r f04884489bad src/mouse.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mouse.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,74 @@ +#include "mouse.h" + +#define INTR 0x33 + +#define QUERY 0 +#define SHOW 1 +#define HIDE 2 +#define READ 3 +#define WRITE 4 + +#define XLIM 7 +#define YLIM 8 + +int have_mouse(void) +{ + int res; + asm { + mov ax, QUERY + int INTR + mov res, ax + } + return res; +} + +void show_mouse(int show) +{ + int cmd = show ? SHOW : HIDE; + asm { + mov ax, cmd + int INTR + } +} + +int read_mouse(int *xp, int *yp) +{ + int x, y, bn; + + asm { + mov ax, READ + int INTR + mov bn, bx + mov x, cx + mov y, dx + /* XXX some sort of div by 8 in the original code ? */ + } + + if(xp) *xp = x; + if(yp) *yp = y; + return bn; +} + +void set_mouse(int x, int y) +{ + asm { + mov ax, WRITE + mov cx, x + mov dx, y + int INTR + } +} + +void set_mouse_limits(int xmin, int ymin, int xmax, int ymax) +{ + asm { + mov ax, XLIM + mov cx, xmin + mov dx, xmax + int INTR + mov ax, YLIM + mov cx, ymin + mov dx, ymax + int INTR + } +} diff -r 000000000000 -r f04884489bad src/mouse.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/mouse.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,14 @@ +#ifndef MOUSE_H_ +#define MOUSE_H_ + +#define MOUSE_LEFT 1 +#define MOUSE_RIGHT 2 +#define MOUSE_MIDDLE 4 + +int have_mouse(void); +void show_mouse(int show); +int read_mouse(int *xp, int *yp); +void set_mouse(int x, int y); +void set_mouse_limits(int xmin, int ymin, int xmax, int ymax); + +#endif /* MOUSE_H_ */ diff -r 000000000000 -r f04884489bad src/pit8254.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/pit8254.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,34 @@ +#ifndef PIT8254_H_ +#define PIT8254_H_ + +/* frequency of the oscillator driving the 8254 timer */ +#define OSC_FREQ_HZ 1193182 + +/* I/O ports connected to the 8254 */ +#define PORT_DATA0 0x40 +#define PORT_DATA1 0x41 +#define PORT_DATA2 0x42 +#define PORT_CMD 0x43 + +/* command bits */ +#define CMD_CHAN0 0 +#define CMD_CHAN1 (1 << 6) +#define CMD_CHAN2 (2 << 6) +#define CMD_RDBACK (3 << 6) + +#define CMD_LATCH 0 +#define CMD_ACCESS_LOW (1 << 4) +#define CMD_ACCESS_HIGH (2 << 4) +#define CMD_ACCESS_BOTH (3 << 4) + +#define CMD_OP_INT_TERM 0 +#define CMD_OP_ONESHOT (1 << 1) +#define CMD_OP_RATE (2 << 1) +#define CMD_OP_SQWAVE (3 << 1) +#define CMD_OP_SW_STROBE (4 << 1) +#define CMD_OP_HW_STROBE (5 << 1) + +#define CMD_MODE_BIN 0 +#define CMD_MODE_BCD 1 + +#endif /* PIT8254_H_ */ diff -r 000000000000 -r f04884489bad src/scantmpl.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/scantmpl.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,158 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +static void SCAN_EDGE(struct vertex *v0, struct vertex *v1) +{ + int i, start, end; + float dx, dy, dfdx; +#ifdef INTERP_DEPTH + float z, dz, dfdz; +#endif +#ifdef INTERP_ENERGY + float e, de, dfde; +#endif + float x, y; + struct vertex *edge; + + dy = v1->pos.y - v0->pos.y; + if(dy < 1e-6 && dy > -1e-6) { + return; + } + + dx = v1->pos.x - v0->pos.x; + dfdx = dx / dy; + +#ifdef INTERP_DEPTH + assert(fb->zbuf); + dz = v1->pos.z - v0->pos.z; + dfdz = dz / dy; +#endif +#ifdef INTERP_ENERGY + de = v1->energy - v0->energy; + dfde = de / dy; +#endif + + if(dy < 0.0) { + struct vertex *tmp = v0; + v0 = v1; + v1 = tmp; + edge = (st->ord == MGL_CCW) ? vright : vleft; + } else { + edge = (st->ord == MGL_CCW) ? vleft : vright; + } + + start = (int)ROUND(v0->pos.y); + end = (int)ROUND(v1->pos.y); + + x = v0->pos.x; +#ifdef INTERP_DEPTH + z = v0->pos.z; +#endif +#ifdef INTERP_ENERGY + e = v0->energy; +#endif + for(i=start; icidx; +#ifdef INTERP_DEPTH + edge[i].pos.z = z; + z += dfdz; +#endif + +#ifdef INTERP_ENERGY + edge[i].energy = e; + e += dfde; +#else + edge[i].energy = v0->energy; +#endif + } +} + +static void SCAN_LINE(int y, unsigned char *sline) +{ + int i, x0, x1, len, tmp, cidx; +#if defined(INTERP_DEPTH) || defined(INTERP_ENERGY) + float x, dx; +#endif +#ifdef INTERP_DEPTH + float z, dz, dfdz; +#endif +#ifdef INTERP_ENERGY + float e, de, dfde; +#endif + struct vertex *left, *right; + + x0 = (int)ROUND(vleft[y].pos.x); + x1 = (int)ROUND(vright[y].pos.x); + len = x1 - x0; + + if(x1 < x0) { + if(st->flags & MGL_CULL_FACE) { + return; + } + tmp = x0; + x0 = x1; + x1 = tmp; + len = -len; + + left = vright; + right = vleft; + } else { + left = vleft; + right = vright; + } + + if(x0 < 0) x0 = 0; + if(x1 >= fb->width) x1 = fb->width - 1; + + assert(len >= 0); + + cidx = left[y].cidx; +#if !defined(INTERP_DEPTH) && !defined(INTERP_ENERGY) + /* no interpolation at all, just memset the whole scanline */ + memset(sline + x0, cidx + left[y].energy * st->col_range, len); +#else + /* otherwise do a loop and interpolate whatever needs interpolating */ + x = left[y].pos.x; + dx = right[y].pos.x - x; + + if(dx < 0.5 && dx > -0.5) { + return; + } + +#ifdef INTERP_DEPTH + z = left[y].pos.z; + dz = right[y].pos.z - z; + dfdz = dz / dx; +#endif +#ifdef INTERP_ENERGY + e = left[y].energy; + de = right[y].energy - e; + dfde = de / dx; +#endif + + for(i=0; icol_range; + e += dfde; +#endif + sline[x0 + i] = cidx; + } +#endif /* flat */ +} diff -r 000000000000 -r f04884489bad src/test.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/test.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,399 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#include +#include +#include +#include +#include +#include "vga.h" +#include "mingl.h" +#include "timer.h" +#include "mouse.h" + +#define ROFFS 64 +#define GOFFS 128 +#define BOFFS 192 + +static int init(void); +static void shutdown(void); +static void redraw(void); +static void draw_cursor(unsigned char *fb, int xsz, int ysz, int mx, int my, int cidx); +static int keyb(char key); +static void mouse_button(int bn, int x, int y); +static void mouse_motion(int x, int y); +static void sighandler(int s); +static int parse_args(int argc, char **argv); +static void print_perf(void); + +static unsigned char *fbuf; + +static int use_vsync = 1; +static int under_windows = 0; +static unsigned long num_frm; + +enum { CUBE, SPHERE, TORUS, NUM_PRIMS }; +static int prim = SPHERE; +static int auto_rotate = 1; +static float cam_theta, cam_phi; + +static int mx, my; + +int main(int argc, char **argv) +{ + int mbn, prev_mx = -1, prev_my = -1, prev_mbn = 0; + + if(parse_args(argc, argv) == -1) { + return 1; + } + + if(init() == -1) { + return 1; + } + + reset_timer(); + + for(;;) { + if(kbhit()) { + if(keyb(getch()) == 0) { + break; + } + } + + mbn = read_mouse(&mx, &my); + if(mbn != prev_mbn) { + mouse_button(mbn, mx, my); + prev_mbn = mbn; + } + if(mx != prev_mx || my != prev_my) { + if(mbn) { + mouse_motion(mx, my); + } + prev_mx = mx; + prev_my = my; + } + + redraw(); + } + + shutdown(); + print_perf(); + return 0; +} + +static int init(void) +{ + int i; + + init_timer(under_windows ? 0 : 100); + + set_video_mode(0x13); + + signal(SIGINT, sighandler); + signal(SIGSEGV, sighandler); + signal(SIGFPE, sighandler); + signal(SIGILL, sighandler); + signal(SIGABRT, sighandler); + + for(i=0; i<64; i++) { + int x = i << 2; + set_palette(i, x, x, x); + set_palette(i + ROFFS, x, 0, 0); + set_palette(i + GOFFS, 0, x, 0); + set_palette(i + BOFFS, 0, 0, x); + } + + if(mgl_init(320, 200) == -1) { + fprintf(stderr, "mgl init failed\n"); + return -1; + } + fbuf = mgl_framebuffer(); + + mgl_enable(MGL_CULL_FACE); + mgl_enable(MGL_SMOOTH); + mgl_color_range(63); /* gradient range */ + + mgl_enable(MGL_LIGHTING); + mgl_light_intensity(0, 1.0); + mgl_light_direction(0, -0.5, 0.5, 1); + + mgl_matrix_mode(MGL_PROJECTION); + mgl_load_identity(); + mgl_perspective(45.0, 320.0 / 200.0, 0.5, 100.0); + + return 0; +} + +static void shutdown(void) +{ + mgl_free(); + set_video_mode(3); +} + +static void redraw(void) +{ + float angle = get_msec() / 10.0; + mgl_clear(0); + + mgl_matrix_mode(MGL_MODELVIEW); + mgl_load_identity(); + if(auto_rotate) { + mgl_rotate(angle, 0, 0, 1); + mgl_rotate(angle * 0.5, 1, 0, 0); + } else { + mgl_rotate(cam_theta, 0, 1, 0); + mgl_rotate(cam_phi, 1, 0, 0); + } + mgl_translate(0, 0, -4); + + switch(prim) { + case TORUS: + mgl_index(GOFFS); + mgl_torus(1.0, 0.25, 16, 8); + break; + case SPHERE: + mgl_index(BOFFS); + mgl_sphere(1.0, 16, 8); + break; + case CUBE: + mgl_index(ROFFS); + mgl_cube(1.0); + } + + /*mgl_begin(MGL_QUADS); + mgl_index(ROFFS); + mgl_color1f(1.0); + mgl_vertex2f(-1, -1); + mgl_vertex2f(1, -1); + mgl_color1f(0.1); + mgl_vertex2f(1, 1); + mgl_vertex2f(-1, 1); + mgl_end();*/ + + if(!auto_rotate) { + draw_cursor(fbuf, 320, 200, mx, my, 63); + } + + copy_frame(fbuf); + if(use_vsync) { + wait_vsync(); + } + num_frm++; +} + +static void draw_cursor(unsigned char *fb, int xsz, int ysz, int mx, int my, int cidx) +{ + static char img[] = + "oo........" + "oxo......." + "oxxo......" + "oxxxo....." + "oxxxxo...." + "oxxxxxo..." + "oxxxxxxo.." + "oxxxxxxxo." + "oxxxxxxxxo" + "oxxxxxoooo" + "oxxoxxo..." + "oxo.oxxo.." + "oo..oxxo.." + ".....oxxo." + ".....oxxo." + "......oo.."; + int i, j, w = 10, h = 16; + + if(mx < 0 || my < 0) { + return; + } + if(mx + w >= xsz) { + w = xsz - mx; + } + if(my + h >= ysz) { + h = ysz - my; + } + + fb += my * xsz + mx; + for(i=0; i 90) cam_phi = 90; + if(cam_phi < -90) cam_phi = -90; + } +} + +static void sighandler(int s) +{ + set_video_mode(3); + + switch(s) { + case SIGABRT: + fprintf(stderr, "abort\n"); + break; + + case SIGILL: + fprintf(stderr, "illegal operation\n"); + break; + + case SIGSEGV: + fprintf(stderr, "segmentation fault\n"); + break; + + case SIGINT: + fprintf(stderr, "interrupted\n"); + break; + + case SIGFPE: + fprintf(stderr, "floating point exception\n"); + break; + + default: + fprintf(stderr, "unexpected signal\n"); + } + + exit(1); +} + +static int parse_args(int argc, char **argv) +{ + int i; + + for(i=1; i + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#include +#include +#include +#include "pit8254.h" + +#define PIT_TIMER_INTR 8 +#define DOS_TIMER_INTR 0x1c + +/* macro to divide and round to the nearest integer */ +#define DIV_ROUND(a, b) \ + ((a) / (b) + ((a) % (b)) / ((b) / 2)) + +static void set_timer_reload(int reload_val); +static void cleanup(void); +static void interrupt dos_timer_intr(); +static void interrupt timer_irq(); +static void interrupt (*prev_timer_intr)(); + +static unsigned long ticks; +static unsigned long tick_interval, ticks_per_dos_intr; +static int inum; + +void init_timer(int res_hz) +{ + + disable(); + if(res_hz > 0) { + int reload_val = DIV_ROUND(OSC_FREQ_HZ, res_hz); + set_timer_reload(reload_val); + + tick_interval = DIV_ROUND(1000, res_hz); + ticks_per_dos_intr = DIV_ROUND(65535L, reload_val); + + inum = PIT_TIMER_INTR; + prev_timer_intr = getvect(inum); + setvect(inum, timer_irq); + } else { + tick_interval = 55; + + inum = DOS_TIMER_INTR; + prev_timer_intr = getvect(inum); + setvect(inum, dos_timer_intr); + } + enable(); + + atexit(cleanup); +} + +static void cleanup(void) +{ + if(!prev_timer_intr) { + return; /* init hasn't ran, there's nothing to cleanup */ + } + + disable(); + if(inum == PIT_TIMER_INTR) { + /* restore the original timer frequency */ + set_timer_reload(65535); + } + + /* restore the original interrupt handler */ + setvect(inum, prev_timer_intr); + enable(); +} + +void reset_timer(void) +{ + ticks = 0; +} + +unsigned long get_msec(void) +{ + return ticks * tick_interval; +} + +static void set_timer_reload(int reload_val) +{ + outportb(PORT_CMD, CMD_CHAN0 | CMD_ACCESS_BOTH | CMD_OP_SQWAVE); + outportb(PORT_DATA0, reload_val & 0xff); + outportb(PORT_DATA0, (reload_val >> 8) & 0xff); +} + +static void interrupt dos_timer_intr() +{ + ticks++; + prev_timer_intr(); +} + +/* first PIC command port */ +#define PIC1_CMD 0x20 +/* end of interrupt control word */ +#define OCW2_EOI (1 << 5) + +static void interrupt timer_irq() +{ + static unsigned long dos_ticks; + + ticks++; + + if(++dos_ticks >= ticks_per_dos_intr) { + /* I suppose the dos irq handler does the EOI so I shouldn't + * do it if I am to call the previous function + */ + prev_timer_intr(); + dos_ticks = 0; + } else { + /* send EOI to the PIC */ + outportb(PIC1_CMD, OCW2_EOI); + } +} diff -r 000000000000 -r f04884489bad src/timer.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/timer.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,29 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#ifndef TIMER_H_ +#define TIMER_H_ + +/* expects the required timer resolution in hertz + * if res_hz is 0, the current resolution is retained + */ +void init_timer(int res_hz); + +void reset_timer(void); +unsigned long get_msec(void); + +#endif /* TIMER_H_ */ diff -r 000000000000 -r f04884489bad src/vga.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/vga.c Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,68 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#include +#include + +void set_video_mode(int mode) +{ + asm { + mov ax, mode + int 0x10 + } +} + +void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b) +{ + asm { + mov dx, 0x3c8 + mov al, c + out dx, al + inc dx + mov al, r + shr al, 2 + out dx, al + mov al, g + shr al, 2 + out dx, al + mov al, b + shr al, 2 + out dx, al + } +} + +void copy_frame(unsigned char *frame) +{ + _fmemcpy(MK_FP(0xa000, 0), frame, 64000); +} + +void wait_vsync(void) +{ + asm mov dx, 0x3da +l1: + asm { + in al, dx + and al, 0x8 + jnz l1 + } +l2: + asm { + in al, dx + and al, 0x8 + jz l2 + } +} diff -r 000000000000 -r f04884489bad src/vga.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/vga.h Mon Nov 21 06:14:01 2011 +0200 @@ -0,0 +1,26 @@ +/* +256-color 3D graphics hack for real-mode DOS. +Copyright (C) 2011 John Tsiombikas + +This program is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +This program 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 General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program. If not, see . +*/ +#ifndef VGA_H_ +#define VGA_H_ + +void set_video_mode(int mode); +void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b); +void copy_frame(unsigned char *frame); +void wait_vsync(void); + +#endif /* VGA_H_ */