129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
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#include "common.h"
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//#link "common.c"
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#include "scrolling.h"
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//#link "scrolling.c"
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#include "sprites.h"
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//#link "sprites.c"
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#include <cbm_petscii_charmap.h>
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static void draw_cell(word ofs, byte x, byte y) {
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byte xx = x + origin_x;
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byte yy = y + origin_y;
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byte ch = xx ^ yy;
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hidbuf[ofs] = ch; // character
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colorbuf[ofs] = ch; // color
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}
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void scroll_draw_column(byte col) {
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byte y;
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word ofs = col;
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for (y=0; y<ROWS; y++) {
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draw_cell(ofs, col, y);
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ofs += COLS;
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}
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}
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void scroll_draw_row(byte row) {
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byte x;
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word ofs = row * COLS;
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for (x=0; x<COLS; x++) {
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draw_cell(ofs, x, row);
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++ofs;
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}
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}
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/*{w:24,h:21,bpp:1,brev:1}*/
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const char SPRITE1[3*21] = {
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0x00,0x7F,0x00,0x01,0xFF,0xC0,0x03,0xFF,0xE0,
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0x03,0xE7,0xE0,0x07,0xD9,0xF0,0x07,0xDF,0xF0,
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0x07,0xD9,0xF0,0x03,0xE7,0xE0,0x03,0xFF,0xE0,
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0x03,0xFF,0xE0,0x02,0xFF,0xA0,0x01,0x7F,0x40,
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0x01,0x3E,0x40,0x00,0x9C,0x80,0x00,0x9C,0x80,
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0x00,0x49,0x00,0x00,0x49,0x00,0x00,0x3E,0x00,
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0x00,0x3E,0x00,0x00,0x3E,0x00,0x00,0x1C,0x00
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};
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int playerx = 0;
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int playery = 0;
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int camerax = 0;
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int cameray = 0;
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void update_player() {
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sprite_draw(0, playerx-camerax+160, playery-cameray+140, 192);
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}
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void camera_follow(byte moving) {
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int dx, dy;
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dx = camerax - playerx;
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dy = cameray - playery;
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if (moving && abs(dx) < 32 && abs(dy) < 32) return;
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dx >>= 4;
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dy >>= 4;
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if (dx) {
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if (dx > 8) dx = 8;
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else if (dx < -8) dx = -8;
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camerax -= dx;
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}
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if (dy) {
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if (dy > 8) dy = 8;
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else if (dy < -8) dy = -8;
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cameray -= dy;
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}
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scroll_xy(dx, dy);
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}
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void main(void) {
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clrscr();
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printf("\r\n\r\n\r\n Hello World!");
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printf("\r\n\r\n\r\n Use the joystick to move");
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printf("\r\n\r\n\r\n And the camera will follow");
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// setup scrolling library
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scroll_setup();
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VIC.bordercolor = 12;
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// setup sprite library and copy sprite to VIC bank
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sprite_clear();
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sprite_set_shapes(SPRITE1, 192, 1);
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sprshad.spr_color[0] = 13;
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// install the joystick driver
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joy_install (joy_static_stddrv);
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// infinite loop
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while (1) {
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static char speed;
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static char joy;
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static bool slowframe = false;
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// get joystick bits
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joy = joy_read(0);
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// speed up scrolling while button pressed
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speed = JOY_BTN_1(joy) ? 3 : 1;
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// if we copied screen memory last frame,
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// double speed of player for this frame
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if (slowframe) speed *= 2;
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// move sprite based on arrow keys
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if (JOY_LEFT(joy)) playerx -= speed;
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if (JOY_RIGHT(joy)) playerx += speed;
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if (JOY_UP(joy)) playery -= speed;
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if (JOY_DOWN(joy)) playery += speed;
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// move the camera?
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camera_follow(joy);
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slowframe = swap_needed;
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// animate sprite in shadow sprite ram
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update_player();
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// wait for end of frame
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wait_vblank();
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// then update sprite registers
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sprite_update(visbuf);
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// update scroll registers
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// and swap screens if we must
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scroll_update();
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}
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}
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