68 lines
1.3 KiB
Plaintext
68 lines
1.3 KiB
Plaintext
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#include <atari2600.h>
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#include <vcslib.h>
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#include <peekpoke.h>
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#include <mapper.h>
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#ifdef __ATARI2600_MAPPER_3E__
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MAPPER_CART_ROM_KB(6); // 6K ROM
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#endif
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#ifdef MAPPER_BANKED_ROM
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#define ROM_BANK(index) __attribute__((noinline, section(".rom"#index)))
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#else
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#define ROM_BANK(index)
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#endif
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#define KERNEL_BANK 1
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ROM_BANK(KERNEL_BANK) void my_preframe(void) {
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}
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ROM_BANK(KERNEL_BANK) void my_doframe(void) {
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int i;
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// Set player sprite color
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TIA.colup0 = COLOR_CONV(0xfe);
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// Draw each scanline
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for (i=0; i<192; i++) {
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TIA.wsync = 0; // sync to scanline
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TIA.colubk = i; // set background color
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TIA.pf1 = i; // set playfield
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TIA.grp0 = i; // set sprite bitmap
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}
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TIA.grp0 = 0; // clear sprite
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TIA.colubk = 0; // clear background
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}
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ROM_BANK(KERNEL_BANK) void my_postframe(void) {
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// additional post-frame processing goes here
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}
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// Display kernel loop
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ROM_BANK(KERNEL_BANK) void do_kernel_loop() {
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// loop until reset released
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while (SW_RESET()) { }
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// loop forever
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while (1) {
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kernel_1();
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my_preframe();
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kernel_2();
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my_doframe();
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kernel_3();
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my_postframe();
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kernel_4();
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}
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}
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int main() {
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// test banked rom call, if available
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#ifdef MAPPER_BANKED_ROM
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banked_call_rom(KERNEL_BANK, do_kernel_loop);
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#else
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do_kernel_loop();
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#endif
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return 0;
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}
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