AI improvements

diff --git a/main.asm b/main.asm
index d71ce8bcd9052e065049256280431d25da067e96..f37ea46ea09990f44a95eb6588bf21fcf173de7a 100644 (file)
--- a/main.asm
+++ b/main.asm
@@ -164,7 +164,7 @@ Reset
        stx Lives ; 2 lives
 
        jsr ResetPPositions
-       
+
        jsr SetM0Pos
 
        ldx #1 ; only set intro state here
@@ -564,6 +564,28 @@ BirdAI
        ldx #0
        cpx BirdAICounter
        bne MoveBirdAI ; jump to keep doing what we are doing
+
+       bit SWCHB ; only do non-random pattern on difficulty b
+       bmi RandomBirdAI ; means switch is A
+
+       ; ldx Level ; if level is smaller than 5 random moves
+       ; cpx #5
+
+       ; bmi RandomBirdAI ; if smaller than this jmp
+       ldx ObjectX ; player x
+       cpx ObjectX+1 ; bird x
+       bmi MoveLeftStructuredBird
+
+       ldx #0
+       stx BirdLeftRightStatus
+       jmp LeftRightBirdAIDone
+MoveLeftStructuredBird
+       ldx #1
+       stx BirdLeftRightStatus
+
+       jmp LeftRightBirdAIDone
+
+RandomBirdAI
        ; first we call Random to determine which direction bird moves
        jsr Random
        ; if random is even move left, else right
@@ -571,6 +593,8 @@ BirdAI
        and Rand8
        beq EvenLeftRightBirdAI; is even
 
+
+OddLeftRightBirdAI
        ; odd bird AI
        ldx #0
        stx BirdLeftRightStatus
@@ -585,19 +609,25 @@ LeftRightBirdAIDone
        ; if random is even move up, else down
        lda #1 ; bit mask
        and Rand8
-       beq EvenBirdUpDownBirdAI; is even
+       beq EvenUpDownBirdAI; is even
 
+OddUpDownBirdAI
        ; odd
        ldx #0
        stx BirdUpDownStatus
        jmp UpDownBirdAIDone
        ; even
-EvenBirdUpDownBirdAI
+EvenUpDownBirdAI
        ldx #1
        stx BirdUpDownStatus
 UpDownBirdAIDone
-       ldx #20 ; bird ai will follow this pattern for 20 frames
-       stx BirdAICounter
+       ;lda #20 ; bird ai will follow this pattern for 20 frames
+       ;clc
+       ;adc Rand8
+       lda Rand8
+       clc
+       sbc Level ; bird pattern changes in Rand8 minus Level time
+       sta BirdAICounter
 
 MoveBirdAI
        dec BirdAICounter