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| author | Daniel Jones <admin@danieljon.es> | 2020-08-17 19:51:43 +0930 |
|---|---|---|
| committer | Daniel Jones <admin@danieljon.es> | 2020-08-17 19:51:51 +0930 |
| commit | 78af003371b6b651e1d9b005702e3d22cee951c7 (patch) | |
| tree | 53c9b61139c4de10184a00397af20ddcce817b69 /main.c | |
| parent | 7d60741c1393ebc0c572891cfeb19a25c4579ed6 (diff) | |
| download | chip8-78af003371b6b651e1d9b005702e3d22cee951c7.tar.gz chip8-78af003371b6b651e1d9b005702e3d22cee951c7.zip | |
implement pixel XORing and wrapping
sprites are properly XOR'd to the display, setting the 0xF register as appropriate.
sprites also wrap on the bottom and irght side of the screen. because you can't access negative video memory, wrpaping top to bottom and left to right isn't implemented
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 13 |
1 files changed, 11 insertions, 2 deletions
@@ -12,7 +12,7 @@ * http://www.emulator101.com/chip-8-sprites.html */ -#define VIDEO_SCALE 10 +#define VIDEO_SCALE 5 SDL_Window *window; SDL_Renderer *renderer; @@ -109,6 +109,7 @@ int main(int argc, char *argv[]) uint32_t frame_time; int do_quit = 0; + chip8_draw_sprite(0, 0, 0xD*5, 0x5); chip8_draw_sprite(5, 0, 0xE*5, 0x5); chip8_draw_sprite(10, 0, 0xA*5, 0x5); @@ -127,13 +128,21 @@ int main(int argc, char *argv[]) chip8_draw_sprite(30, 9, 0xE*5, 0x5); chip8_draw_sprite(35, 9, 0xf*5, 0x5); + chip8_draw_sprite(0, 20, 0x200, 0x6); + chip8_draw_sprite(8, 20, 0x200, 0x6); + chip8_draw_sprite(16, 20, 0x200, 0x6); + chip8_draw_sprite(18, 20, 0x200, 0x6); + + chip8_draw_sprite(61, 25, 0x200, 0x6); + chip8_draw_sprite(50, 30, 0x200, 0x6); while(!do_quit) { frame_start = SDL_GetTicks(); // logic - update_video(); + if (draw_flag) + update_video(); frame_time = SDL_GetTicks() - frame_start; if (frame_delay > frame_time) |