91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
#include <c64/vic.h>
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#include <c64/rasterirq.h>
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#include <c64/sprites.h>
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#include <math.h>
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#define Screen ((char *)0x400)
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// make space until 0x2000 for code and data
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#pragma region( lower, 0x0a00, 0x2000, , , {code, data} )
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// then space for our sprite data
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#pragma section( spriteset, 0)
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#pragma region( spriteset, 0x2000, 0x2800, , , {spriteset} )
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// everything beyond will be code, data, bss and heap to the end
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#pragma region( main, 0x2800, 0xa000, , , {code, data, bss, heap, stack} )
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// spriteset at fixed location
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#pragma data(spriteset)
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char spriteset[2048] = {
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#embed "../samples/resources/digitsprites.bin"
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};
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#pragma data(data)
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// sinus table for circular movement
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int sintab[128];
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int main(void)
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{
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// calculate sine table
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for(int i=0; i<128; i++)
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sintab[i] = (int)(80 * sin(i * PI / 64));
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// enable raster interrupt via kernal path
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rirq_init(true);
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// initialize sprite multiplexer
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vspr_init(Screen);
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// initalize sprites
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for(int i=0; i<16; i++)
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{
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vspr_set(i, 30 + 16 * i, 220 - 8 * i, (unsigned)&(spriteset[0]) / 64 + i, (i & 7) + 8);
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}
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// initial sort and update
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vspr_sort();
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vspr_update();
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rirq_sort();
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// start raster IRQ processing
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rirq_start();
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// animation loop
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unsigned j = 0;
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for(;;)
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{
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// move sprites around
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char k = j >> 4;
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for(char i=0; i<16; i++)
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{
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vspr_move(i, 200 + sintab[(j + 8 * i) & 127] + sintab[k & 127], 140 + sintab[(j + 8 * i + 32) & 127] + sintab[(k + 32) & 127]);
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}
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j++;
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// sort virtual sprites by y position
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vspr_sort();
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// wait for raster IRQ to reach and of frame
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rirq_wait();
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// update sprites back to normal and set up raster IRQ for second set
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vspr_update();
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// sort raster IRQs
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rirq_sort();
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}
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return 0;
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}
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