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tfv: add multi-page plot routine
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@ -447,7 +447,7 @@ int color_equals(int new_color) {
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static void plot(void) {
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static void monitor_plot(void) {
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unsigned char c;
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@ -499,7 +499,7 @@ int basic_plot(unsigned char xcoord, unsigned char ycoord) {
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return -1;
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}
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plot();
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monitor_plot();
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return 0;
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}
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@ -577,7 +577,7 @@ static void vline(void) {
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// f828
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vline_loop:
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s=a;
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plot();
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monitor_plot();
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a=s;
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if (a<ram[V2]) {
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a++;
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@ -1237,6 +1237,34 @@ int hlin_continue(int width) {
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}
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int plot(unsigned char xcoord, unsigned char ycoord) {
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unsigned char c;
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hlin_addr=gr_addr_lookup[ycoord/2];
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hlin_addr+=(ram[DRAW_PAGE])<<8;
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hlin_addr+=xcoord;
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hlin_hi=ycoord&1;
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if (hlin_hi) {
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/* If odd, mask is 0xf0 */
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ram[MASK]=0xf0;
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}
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else {
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/* If even, mask is 0x0f */
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ram[MASK]=0x0f;
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}
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c=ram[COLOR]&ram[MASK];
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ram[hlin_addr]&=~ram[MASK];
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ram[hlin_addr]|=c;
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return 0;
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}
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int hlin(int page, int x1, int x2, int at) {
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hlin_addr=gr_addr_lookup[at/2];
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@ -38,7 +38,7 @@ void htab(int xpos);
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void move_cursor(void);
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void print(char *string);
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void print_inverse(char *string);
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int plot(unsigned char xcoord, unsigned char ycoord);
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#define APPLE_UP 11
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#define APPLE_DOWN 10
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@ -30,7 +30,151 @@ static unsigned char flying_map[64]= {
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#define LOWRES_W 40
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#define LOWRES_H 40
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#if 1
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//
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// Detailed version
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//
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//
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static int lookup_map(int x, int y) {
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int color;
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color=2;
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x=x&MASK_X;
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y=y&MASK_Y;
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if ( ((y&0x3)==1) && ((x&7)==0) ) color=14;
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if ( ((y&0x3)==3) && ((x&7)==4) ) color=14;
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if ((y<8) && (x<8)) {
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color=flying_map[(y*8)+x];
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}
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/* 2 2 2 2 2 2 2 2 */
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/* 14 14 2 2 2 2 2 2 */
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/* 2 2 2 2 14 14 2 2 */
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/* 2 2 2 2 2 2 2 2 */
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return color;
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}
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/* http://www.helixsoft.nl/articles/circle/sincos.htm */
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static double space_z=4.5; // height of the camera above the plane
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static int horizon=-2; // number of pixels line 0 is below the horizon
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static double scale_x=20, scale_y=20;
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//void mode_7 (BITMAP *bmp, BITMAP *tile, fixed angle, fixed cx, fixed cy, MODE_7_PARAMS params)
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double BETA=-0.5;
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static int over_water;
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void draw_background_mode7(double angle, double cx, double cy) {
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// current screen position
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int screen_x, screen_y;
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// the distance and horizontal scale of the line we are drawing
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double distance, horizontal_scale;
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// step for points in space between two pixels on a horizontal line
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double line_dx, line_dy;
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// current space position
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double space_x, space_y;
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int map_color;
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over_water=0;
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/* Draw Sky */
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/* Originally wanted to be fancy and have sun too, but no */
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color_equals(COLOR_MEDIUMBLUE);
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for(screen_y=0;screen_y<6;screen_y+=2) {
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hlin_double(ram[DRAW_PAGE], 0, 40, screen_y);
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}
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/* Draw hazy horizon */
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color_equals(COLOR_GREY);
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hlin_double(ram[DRAW_PAGE], 0, 40, 6);
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for (screen_y = 8; screen_y < LOWRES_H; screen_y++) {
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// first calculate the distance of the line we are drawing
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distance = (space_z * scale_y) / (screen_y + horizon);
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// then calculate the horizontal scale, or the distance between
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// space points on this horizontal line
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horizontal_scale = (distance / scale_x);
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// calculate the dx and dy of points in space when we step
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// through all points on this line
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line_dx = -sin(angle) * horizontal_scale;
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line_dy = cos(angle) * horizontal_scale;
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// calculate the starting position
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space_x = cx + (distance * cos(angle)) - LOWRES_W/2 * line_dx;
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space_y = cy + (distance * sin(angle)) - LOWRES_W/2 * line_dy;
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// Move camera back a bit
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double factor;
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factor=space_z*BETA;
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// factor=2.0*BETA;
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space_x+=factor*cos(angle);
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space_y+=factor*sin(angle);
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// go through all points in this screen line
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for (screen_x = 0; screen_x < LOWRES_W-1; screen_x++) {
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// get a pixel from the tile and put it on the screen
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map_color=lookup_map((int)space_x,(int)space_y);
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//ram[COLOR]=map_color;
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//ram[COLOR]|=map_color<<4;
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color_equals(map_color);
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if (screen_x==20) {
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if (map_color==COLOR_DARKBLUE) over_water=1;
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else over_water=0;
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}
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//hlin_double(ram[DRAW_PAGE], screen_x, screen_x+1,
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// screen_y);
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plot(screen_x,screen_y);
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// advance to the next position in space
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space_x += line_dx;
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space_y += line_dy;
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}
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}
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}
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#else
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//
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// Non-detailed version
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//
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//
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//
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static int lookup_map(int x, int y) {
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@ -161,6 +305,8 @@ void draw_background_mode7(double angle, double cx, double cy) {
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}
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}
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#endif
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#define SHIPX 15
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