git.y1.nz

commit 7a8459d07a69a923f850ccbf4720321418ccf2e8
parent 319a6bb1bbb57515458388d09e4cf444762aa5ea
Author: toxa <untoxa@mail.ru>
Date:   Mon, 19 Oct 2020 14:55:58 +0300

multiplayer SGB pong example

Diffstat:
M
gbdk-lib/examples/gb/Makefile
12
+++++++++---
A
gbdk-lib/examples/gb/pong.c
144
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

2 files changed, 153 insertions(+), 3 deletions(-)
diff --git a/gbdk-lib/examples/gb/Makefile b/gbdk-lib/examples/gb/Makefile
@@ -17,7 +17,8 @@ BINS	= galaxy.gb \
 	bcd.gb \
 	wobble.gb \
 	crash.gb \
-	multiplayer.gb
+	multiplayer.gb \
+	pong.gb
 
 # sound.gb: Cant do bitfields
 OTHER = sound.gb \
@@ -109,4 +110,10 @@ ram_fn.gb:	ram_fn.o
 # SGB multiplayer example
 
 multiplayer.gb:	multiplayer.o
-	$(CC) -Wm-ys -o $@ $<
-
+	$(CC) -Wm-ys -o $@ $<
+
+############################################################
+# SGB pong example
+
+pong.gb:	pong.o
+	$(CC) -Wm-ys -o $@ $<
diff --git a/gbdk-lib/examples/gb/pong.c b/gbdk-lib/examples/gb/pong.c
@@ -0,0 +1,143 @@
+#include <gb/gb.h>
+#include <gb/sgb.h>
+
+#include <stdio.h>
+#include <gb/console.h>
+
+UINT8 sprite_data[] = { 
+    0x3C,0x3C,0x42,0x7E,0x99,0xFF,0xA9,0xFF,0x89,0xFF,0x89,0xFF,0x42,0x7E,0x3C,0x3C,
+    0x3C,0x3C,0x42,0x7E,0xB9,0xFF,0x89,0xFF,0x91,0xFF,0xB9,0xFF,0x42,0x7E,0x3C,0x3C,
+    0x3C,0x3C,0x42,0x7E,0x99,0xFF,0x89,0xFF,0x99,0xFF,0x89,0xFF,0x5A,0x7E,0x3C,0x3C,
+    0x3C,0x3C,0x42,0x7E,0xA9,0xFF,0xA9,0xFF,0xB9,0xFF,0x89,0xFF,0x42,0x7E,0x3C,0x3C
+
+};
+
+// initializes sprites for pad. every pad uses 3 sprites which id's are aligned by 4
+void init_pad(UINT8 n) {
+    set_sprite_tile(n << 2, n);
+    set_sprite_tile((n << 2) + 1, n);
+    set_sprite_tile((n << 2) + 2, n);
+}
+
+// inline function for moving pads; code of this function will be inlined with the code of main()
+inline void draw_pad(UINT8 n, UINT8 x, UINT8 y) {
+    move_sprite(n << 2, x, y);
+    move_sprite((n << 2) + 1, x, y + 8);
+    move_sprite((n << 2) + 2, x, y + 16);
+}
+
+joypads_t joypads;
+
+// absolute Y coordinates of player 1 & 2
+UINT8 player1, player2;
+UINT16 player1_score, player2_score;
+
+// player constraints
+#define YMIN 28
+#define YMAX 100
+#define PLAYER1_X 16
+#define PLAYER2_X (UINT8)((20 * 8) - 8)
+
+// coordinates and speeds of ball
+UINT8 ballX, ballY;
+INT8 spd_ballX, spd_ballY;
+
+#define INITBALLX 80 + 4 
+#define INITBALLY 64 + 8
+
+const unsigned char HUD[] = " p1: %d   p2: %d";
+
+// main funxction
+void main(void) {
+    // init palettes
+    BGP_REG = OBP0_REG = OBP1_REG = 0xE4;
+
+    // load tile data into VRAM
+    set_sprite_data(0, 4, sprite_data);
+    
+    // init pad sprites
+    init_pad(0);
+    init_pad(1);
+    
+    // init ball sprite
+    set_sprite_tile(3, 2);
+
+    // show bkg and sprites
+    SHOW_BKG; SHOW_SPRITES;
+
+    // init 2 joypads
+    if (joypad_init(2, &joypads) != 2) {
+        printf(" This program must\n  be executed  on\n   Super GameBoy");
+        return;
+    }
+ 
+    // init players
+    player1 = 64, player2 = 64;
+    player1_score = player2_score = 0;
+    
+    // draw score
+    printf(HUD, player1_score, player2_score);
+    
+    // init ball
+    ballX = INITBALLX, ballY = INITBALLY;
+    spd_ballX = 1, spd_ballY = 1;
+    
+    while(1) {
+        // poll joypads
+        joypad_ex(&joypads);
+        
+        // player 1
+        if (joypads.joy0 & J_UP) {
+            player1 -= 2;
+            if (player1 < YMIN) player1 = YMIN;
+        } else if (joypads.joy0 & J_DOWN) {
+            player1 += 2;
+            if (player1 > YMAX) player1 = YMAX;            
+        }
+        draw_pad(0, PLAYER1_X, player1);
+        
+        // player 2
+        if (joypads.joy1 & J_UP) {
+            player2 -= 2;
+            if (player2 < YMIN) player2 = YMIN;
+        } else if (joypads.joy1 & J_DOWN) {
+            player2 += 2;
+            if (player2 > YMAX) player2 = YMAX;            
+        }
+        draw_pad(1, PLAYER2_X, player2);
+
+        // move ball
+        ballX += spd_ballX, ballY += spd_ballY;
+        // check bounce from limits
+        if ((ballY < YMIN) || (ballY > (YMAX + 24))) {
+            spd_ballY = -spd_ballY; 
+        }
+        // check bounce from bats
+        if (ballX < (PLAYER1_X + 8)) {
+            if ((ballY > player1) && (ballY < (player1 + 24)) && (spd_ballX < 0)) 
+                spd_ballX = -spd_ballX;
+        } else if (ballX > (PLAYER2_X - 8)) {
+            if ((ballY > player2) && (ballY < (player2 + 24)) && (spd_ballX > 0)) 
+                spd_ballX = -spd_ballX;
+        }
+        // check player1 or 2 wins, update scores, start from center
+        if (ballX < PLAYER1_X) {
+            // player2 wins
+            ballX = INITBALLX, ballY = INITBALLY;
+            spd_ballX = -spd_ballX;
+            player2_score++;
+            gotoxy(0, 0); printf(HUD, player1_score, player2_score);
+        } else if (ballX > PLAYER2_X) {
+            // player1 wins
+            ballX = INITBALLX, ballY = INITBALLY;
+            spd_ballX = -spd_ballX;
+            player1_score++;
+            gotoxy(0, 0); printf(HUD, player1_score, player2_score);
+        }
+        // move ball sprite
+        move_sprite(3, ballX, ballY);
+
+        // wait for VBlank to slow down everything
+        wait_vbl_done();
+    }
+}
+

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