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https://github.com/sehugg/8bitworkshop.git
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60 lines
2.2 KiB
Plaintext
60 lines
2.2 KiB
Plaintext
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// example from https://github.com/steux/cc7800 - license: GPLv3
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#include "prosystem.h"
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#include "multisprite.h"
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char i, xpos, ypos;
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#define NB_SMALL_SPRITES 128
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ramchip short sp_xpos[NB_SMALL_SPRITES], sp_ypos[NB_SMALL_SPRITES];
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ramchip char sp_direction[NB_SMALL_SPRITES];
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const signed short dx[24] = {300, 289, 259, 212, 149, 77, 0, -77, -150, -212, -259, -289, -300, -289, -259, -212, -149, -77, 0, 77, 149, 212, 259, 289};
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const signed short dy[24] = {0, 124, 240, 339, 415, 463, 480, 463, 415, 339, 240, 124, 0, -124, -239, -339, -415, -463, -480, -463, -415, -339, -240, -124};
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const char horizontal_pingpong[24] = { 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13 };
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const char vertical_pingpong[24] = { 0, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 };
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// Generated with sprites7800 missile.yaml
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holeydma reversed scattered(16,1) char missile[16] = {
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0x18, 0x96, 0x7a, 0x7e, 0x7e, 0x6e, 0x9a, 0x28, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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};
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void main()
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{
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multisprite_init();
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*P0C1 = multisprite_color(0x1c); // Yellow
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*P0C2 = multisprite_color(0x37); // Orange
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*P0C3 = multisprite_color(0x43); // Red
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// Initialize small sprites
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for (ypos = 0, xpos = 0, i = 0, X = 0; X != NB_SMALL_SPRITES; xpos++, ypos++, X++) {
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sp_xpos[X] = xpos << 8;
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sp_ypos[X] = ypos << 8;
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sp_direction[X] = i++;
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if (i == 24) i = 0;
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}
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// Main loop
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do {
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multisprite_flip();
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for (i = 0; i != NB_SMALL_SPRITES; i++) {
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X = i;
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Y = sp_direction[X];
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sp_xpos[X] += dx[Y];
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sp_ypos[X] += dy[Y];
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xpos = sp_xpos[X] >> 8;
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ypos = sp_ypos[X] >> 8;
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if ((xpos < 5 && (dx[Y] >> 8) < 0) ||
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(xpos >= 150 && (dx[Y] >> 8) >= 0)) {
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sp_direction[X] = horizontal_pingpong[Y];
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}
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if ((ypos < 5 && (dy[Y] >> 8) < 0) ||
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(ypos >= MS_YMAX - 20 && (dy[Y] >> 8) >= 0)) {
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sp_direction[X] = vertical_pingpong[Y];
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}
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multisprite_display_small_sprite(xpos, ypos, missile, 1, 0, 8);
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}
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} while(1);
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}
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