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| author | Jesse Luehrs <doy@tozt.net> | 2014-10-11 23:40:08 -0400 |
|---|---|---|
| committer | Jesse Luehrs <doy@tozt.net> | 2014-10-11 23:40:08 -0400 |
| commit | 07e8706295edc27718d881579b495ba06998ee19 (patch) | |
| tree | 1bcf2243f902f62f835e3f0be0187d1f0d53627c | |
| parent | bb2990f82f5aa901f0aa83e0bec4658d68548663 (diff) | |
| download | nes-snake-07e8706295edc27718d881579b495ba06998ee19.tar.gz nes-snake-07e8706295edc27718d881579b495ba06998ee19.zip | |
simplify a bit more
| -rw-r--r-- | main.s | 31 |
1 files changed, 15 insertions, 16 deletions
@@ -164,19 +164,19 @@ NMI: PHA LDA game_state - BEQ do_dma - CMP #$01 - BEQ draw_game - JMP end_nmi + CMP #$02 + BEQ end_nmi draw_game: -- LDA #$00 +- LDX num_draws + BEQ done_drawing + DEX + STX num_draws + LDA #$00 CLC ADC num_draws ADC num_draws ADC num_draws - SEC - SBC #$03 TAX LDA $0700, x STA $2006 @@ -186,12 +186,9 @@ draw_game: INX LDA $0700, x STA $2007 - LDX num_draws - DEX - STX num_draws - CPX #$00 - BNE - + JMP - +done_drawing: LDA #$20 STA $2006 LDA #$00 @@ -269,7 +266,7 @@ handle_frame: STX frame_count CPX frame_skip BPL + - JMP end_game_loop + JMP draw_sprites + LDA #$00 STA frame_count @@ -339,7 +336,7 @@ check_collisions CPX apple.x BEQ maybe_eat_apple - JMP end_game_loop + JMP draw_sprites collision: JSR end_game @@ -350,7 +347,7 @@ maybe_eat_apple: CPY apple.y BEQ eat_apple - JMP end_game_loop + JMP draw_sprites eat_apple: LDX length @@ -365,7 +362,7 @@ eat_apple: STA frame_skip + JSR new_apple -end_game_loop: +draw_sprites: LDX #$00 JSR draw_sprite_at_head LDA head_x @@ -386,6 +383,8 @@ end_game_loop: CLC ADC length STA head_y + +end_game_loop: RTS ; }}} read_controller1: ; {{{ ; latch |