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tfv: got mode7 flying going

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This commit is contained in:
Vince Weaver 2017-08-17 16:00:48 -04:00
parent 38bffc0caf
commit 9b67ba27b5
5 changed files with 475 additions and 15 deletions
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2
gr-sim/Makefile
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@ -1,6 +1,6 @@
CC = gcc
CFLAGS = -Wall -O2 -g
LFLAGS =
LFLAGS = -lm
SDL_LIBS= `sdl-config --libs`
SDL_INCLUDE= `sdl-config --cflags`

246
gr-sim/mode7_demo.c Normal file
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@ -0,0 +1,246 @@
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "gr-sim.h"
#include "tfv_utils.h"
#include "tfv_zp.h"
#include "tfv_sprites.h"
static unsigned char flying_map[16][16]= {
{0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,},
{0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,},
{0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,},
{0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,},
{4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,},
{4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,},
{4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,},
{4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,},
{8,8,8,8,9,9,9,9,10,10,10,10,11,11,11,11,},
{8,8,8,8,9,9,9,9,10,10,10,10,11,11,11,11,},
{8,8,8,8,9,9,9,9,10,10,10,10,11,11,11,11,},
{8,8,8,8,9,9,9,9,10,10,10,10,11,11,11,11,},
{12,12,12,12,13,13,13,13,14,14,14,14,15,15,15,15,},
{12,12,12,12,13,13,13,13,14,14,14,14,15,15,15,15,},
{12,12,12,12,13,13,13,13,14,14,14,14,15,15,15,15,},
{12,12,12,12,13,13,13,13,14,14,14,14,15,15,15,15,},
};
static int tile_w=16,tile_h=16;
/* http://www.helixsoft.nl/articles/circle/sincos.htm */
static double space_z=2.5; // height of the camera above the plane
static int horizon=-2; // number of pixels line 0 is below the horizon
static double scale_x=20, scale_y=20;
// scale of space coordinates to screen coordinates
static double bmp_w=40, bmp_h=40;
//void mode_7 (BITMAP *bmp, BITMAP *tile, fixed angle, fixed cx, fixed cy, MODE_7_PARAMS params)
double BETA=-0.6;
void draw_background_mode7(double angle, double cx, double cy) {
// current screen position
int screen_x, screen_y;
// the distance and horizontal scale of the line we are drawing
double distance, horizontal_scale;
// masks to make sure we don't read pixels outside the tile
int mask_x = (tile_w - 1);
int mask_y = (tile_h - 1);
// step for points in space between two pixels on a horizontal line
double line_dx, line_dy;
// current space position
double space_x, space_y;
clear_top(0);
for (screen_y = 6; screen_y < bmp_h; screen_y++) {
// first calculate the distance of the line we are drawing
distance = (space_z * scale_y) / (screen_y + horizon);
// then calculate the horizontal scale, or the distance between
// space points on this horizontal line
horizontal_scale = (distance / scale_x);
// calculate the dx and dy of points in space when we step
// through all points on this line
line_dx = -sin(angle) * horizontal_scale;
line_dy = cos(angle) * horizontal_scale;
// calculate the starting position
space_x = cx + (distance * cos(angle)) - bmp_w/2 * line_dx;
space_y = cy + (distance * sin(angle)) - bmp_w/2 * line_dy;
space_x+=(BETA*space_z*cos(angle));
space_y+=(BETA*space_z*sin(angle));
// go through all points in this screen line
for (screen_x = 0; screen_x < bmp_w; screen_x++) {
// get a pixel from the tile and put it on the screen
color_equals(flying_map[(int)space_x & mask_x]
[(int)space_y&mask_y]);
basic_plot(screen_x,screen_y);
// advance to the next position in space
space_x += line_dx;
space_y += line_dy;
}
}
}
int flying(void) {
int i;
unsigned char ch;
int xx,yy;
int turning=0;
double flyx=0,flyy=0;
double our_angle=0.0;
double dy,dx,speed=0;
/************************************************/
/* Flying */
/************************************************/
gr();
xx=17; yy=26;
color_equals(COLOR_BLACK);
color_equals(COLOR_MEDIUMBLUE);
for(i=0;i<20;i++) {
hlin(1, 0, 40, i);
}
color_equals(COLOR_DARKBLUE);
for(i=20;i<48;i++) {
hlin(1, 0, 40, i);
}
while(1) {
ch=grsim_input();
if ((ch=='q') || (ch==27)) break;
if (ch=='g') {
BETA+=0.1;
printf("Horizon=%lf\n",BETA);
}
if (ch=='h') {
BETA-=0.1;
printf("Horizon=%lf\n",BETA);
}
if (ch=='s') {
scale_x++;
scale_y++;
printf("Scale=%lf\n",scale_x);
}
if ((ch=='i') || (ch==APPLE_UP)) {
if (yy>16) {
yy-=2;
space_z+=1;
}
printf("Z=%lf\n",space_z);
}
if ((ch=='m') || (ch==APPLE_DOWN)) {
if (yy<30) {
yy+=2;
space_z-=1;
}
printf("Z=%lf\n",space_z);
}
if ((ch=='j') || (ch==APPLE_LEFT)) {
if (turning>0) {
turning=0;
}
else {
turning=-20;
our_angle-=(6.28/32.0);
if (our_angle<0.0) our_angle+=6.28;
}
// printf("Angle %lf\n",our_angle);
}
if ((ch=='k') || (ch==APPLE_RIGHT)) {
if (turning<0) {
turning=0;
}
else {
turning=20;
our_angle+=(6.28/32.0);
if (our_angle>6.28) our_angle-=6.28;
}
}
if (ch=='z') {
speed+=0.05;
}
if (ch=='x') {
speed-=0.05;
}
if (ch==' ') {
speed=0;
}
{
dx = speed * cos (our_angle);
dy = speed * sin (our_angle);
flyx += dx;
flyy += dy;
}
// gr_copy(0x800,0x400);
draw_background_mode7(our_angle, flyx, flyy);
grsim_put_sprite(0,ship_shadow,xx,30);
if (turning==0) grsim_put_sprite(0,ship_forward,xx,yy);
if (turning<0) {
grsim_put_sprite(0,ship_left,xx,yy);
turning++;
}
if (turning>0) {
grsim_put_sprite(0,ship_right,xx,yy);
turning--;
}
grsim_update();
usleep(20000);
}
return 0;
}

234
gr-sim/tfv_flying.c
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@ -3,28 +3,157 @@
#include <unistd.h>
#include <string.h>
#include <math.h>
#include "gr-sim.h"
#include "tfv_utils.h"
#include "tfv_zp.h"
#include "tfv_sprites.h"
static unsigned char flying_map[32][32]= {
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 15,15,15,15, 2,2,2,0, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 13,12, 8, 4, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 13,12, 8, 4, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 13, 9, 8, 4, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 0,2,2,2, 2,2,2,0, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
{2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2, 2,2,2,2,},
};
static int tile_w=32,tile_h=32;
/* http://www.helixsoft.nl/articles/circle/sincos.htm */
static double space_z=2.5; // height of the camera above the plane
static int horizon=-2; // number of pixels line 0 is below the horizon
static double scale_x=20, scale_y=20;
// scale of space coordinates to screen coordinates
static double bmp_w=40, bmp_h=40;
//void mode_7 (BITMAP *bmp, BITMAP *tile, fixed angle, fixed cx, fixed cy, MODE_7_PARAMS params)
double BETA=-0.6;
void draw_background_mode7(double angle, double cx, double cy) {
// current screen position
int screen_x, screen_y;
// the distance and horizontal scale of the line we are drawing
double distance, horizontal_scale;
// masks to make sure we don't read pixels outside the tile
int mask_x = (tile_w - 1);
int mask_y = (tile_h - 1);
// step for points in space between two pixels on a horizontal line
double line_dx, line_dy;
// current space position
double space_x, space_y;
clear_top(0);
color_equals(COLOR_MEDIUMBLUE);
for(screen_y=0;screen_y<6;screen_y+=2) {
hlin_double(0, 0, 40, screen_y);
}
color_equals(COLOR_GREY);
hlin_double(0, 0, 40, 6);
for (screen_y = 8; screen_y < bmp_h; screen_y++) {
// first calculate the distance of the line we are drawing
distance = (space_z * scale_y) / (screen_y + horizon);
// then calculate the horizontal scale, or the distance between
// space points on this horizontal line
horizontal_scale = (distance / scale_x);
// calculate the dx and dy of points in space when we step
// through all points on this line
line_dx = -sin(angle) * horizontal_scale;
line_dy = cos(angle) * horizontal_scale;
// calculate the starting position
space_x = cx + (distance * cos(angle)) - bmp_w/2 * line_dx;
space_y = cy + (distance * sin(angle)) - bmp_w/2 * line_dy;
space_x+=(BETA*space_z*cos(angle));
space_y+=(BETA*space_z*sin(angle));
// go through all points in this screen line
for (screen_x = 0; screen_x < bmp_w; screen_x++) {
// get a pixel from the tile and put it on the screen
color_equals(flying_map[(int)space_x & mask_x]
[(int)space_y&mask_y]);
basic_plot(screen_x,screen_y);
// advance to the next position in space
space_x += line_dx;
space_y += line_dy;
}
}
}
int flying(void) {
int i;
unsigned char ch;
int xx,yy;
int direction;
int turning=0;
double flyx=0,flyy=0;
double our_angle=0.0;
double dy,dx,speed=0;
/************************************************/
/* Flying */
/************************************************/
gr();
xx=17; yy=30;
xx=17; yy=26;
color_equals(COLOR_BLACK);
direction=0;
color_equals(COLOR_MEDIUMBLUE);
@ -41,26 +170,103 @@ int flying(void) {
ch=grsim_input();
if ((ch=='q') || (ch==27)) break;
if ((ch=='i') || (ch==APPLE_UP)) if (yy>20) yy-=2;
if ((ch=='m') || (ch==APPLE_DOWN)) if (yy<39) yy+=2;
if (ch=='g') {
BETA+=0.1;
printf("Horizon=%lf\n",BETA);
}
if (ch=='h') {
BETA-=0.1;
printf("Horizon=%lf\n",BETA);
}
if (ch=='s') {
scale_x++;
scale_y++;
printf("Scale=%lf\n",scale_x);
}
if ((ch=='i') || (ch==APPLE_UP)) {
if (yy>16) {
yy-=2;
space_z+=1;
}
printf("Z=%lf\n",space_z);
}
if ((ch=='m') || (ch==APPLE_DOWN)) {
if (yy<30) {
yy+=2;
space_z-=1;
}
printf("Z=%lf\n",space_z);
}
if ((ch=='j') || (ch==APPLE_LEFT)) {
direction--;
if (direction<-1) direction=-1;
if (turning>0) {
turning=0;
}
else {
turning=-20;
our_angle-=(6.28/32.0);
if (our_angle<0.0) our_angle+=6.28;
}
// printf("Angle %lf\n",our_angle);
}
if ((ch=='k') || (ch==APPLE_RIGHT)) {
direction++;
if (direction>1) direction=1;
if (turning<0) {
turning=0;
}
else {
turning=20;
our_angle+=(6.28/32.0);
if (our_angle>6.28) our_angle-=6.28;
}
}
gr_copy(0x800,0x400);
if (ch=='z') {
speed+=0.05;
}
if (direction==0) grsim_put_sprite(0,ship_forward,xx,yy);
if (direction==-1) grsim_put_sprite(0,ship_left,xx,yy);
if (direction==1) grsim_put_sprite(0,ship_right,xx,yy);
if (ch=='x') {
speed-=0.05;
}
if (ch==' ') {
speed=0;
}
{
dx = speed * cos (our_angle);
dy = speed * sin (our_angle);
flyx += dx;
flyy += dy;
}
// gr_copy(0x800,0x400);
draw_background_mode7(our_angle, flyx, flyy);
grsim_put_sprite(0,ship_shadow,xx,30);
if (turning==0) grsim_put_sprite(0,ship_forward,xx,yy);
if (turning<0) {
grsim_put_sprite(0,ship_left,xx,yy);
turning++;
}
if (turning>0) {
grsim_put_sprite(0,ship_right,xx,yy);
turning--;
}
grsim_update();
usleep(10000);
usleep(20000);
}
return 0;
}

7
gr-sim/tfv_sprites.c
View File

@ -66,6 +66,13 @@ unsigned char test_sprite[]={
};
#endif
unsigned char ship_shadow[]={
0x5,0x3,
0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0xaa,0x00,0x00,
0x00,0x00,0xaa,0x00,0x00,
};
unsigned char ship_forward[]={
0x5,0x3,
0x00,0x00,0x77,0x00,0x00,

1
gr-sim/tfv_sprites.h
View File

@ -13,3 +13,4 @@ extern unsigned char snowy_tree[];
extern unsigned char cactus[];
extern unsigned char mountain[];
extern unsigned char lightning[];
extern unsigned char ship_shadow[];