added two games

Author: glouw

Makefile

@@ -1,4 +1,4 @@
-CC = gcc
+CC = gcc -std=c99
 
 CFLAGS = -Wshadow -Wall -Wpedantic -Wextra
 CFLAGS+= -Ofast -march=native

emu.c

@@ -212,7 +212,7 @@ static void discharge()
     for(int j = 0; j < VROWS; j++)
     for(int i = 0; i < VCOLS; i++)
         if(!charging(j, i))
-            charges[j][i] *= 0.97;
+            charges[j][i] *= 0.997;
 }
 
 void dump()
@@ -241,7 +241,7 @@ int main(int argc, char* argv[])
         SDL_PumpEvents();
         charge();
         cycle();
-        if(cycles % 10 == 0)
+        if(cycles % 15 == 0)
             output();
         discharge();
     }

examples/Makefile

@@ -3,11 +3,26 @@ BIN = ../bin
 CMP = ../c8c
 
 BINS = mul.bin maze.bin tty.bin
+BINS+= collision.bin invaders.bin
 HEXS = $(BINS:.bin=.hex)
 ASMS = $(BINS:.bin=.asm)
 
 all: $(BINS)
 
+collision.bin: collision.hex
+	$(BIN) $^ $@
+collision.hex: collision.asm
+	$(ASM) $^ $@
+collision.asm: collision.c8
+	$(CMP) $^ $@
+
+invaders.bin: invaders.hex
+	$(BIN) $^ $@
+invaders.hex: invaders.asm
+	$(ASM) $^ $@
+invaders.asm: invaders.c8
+	$(CMP) $^ $@
+
 tty.bin: tty.hex
 	$(BIN) $^ $@
 tty.hex: tty.asm

examples/collision.c8

@@ -0,0 +1,31 @@
+dot = { 0x80 };
+
+main()
+{
+    auto x = 3, xm = 64;
+    auto y = 3, ym = 32;
+    auto dir = 1;
+    // Directional keyboard keys.
+    auto A = 7, D = 9, W = 5, S = 8;
+    while(1)
+    {
+        // Get move direction.
+        auto a = getchar();
+        if(a == A) { dir = 0; } else
+        if(a == D) { dir = 1; } else
+        if(a == W) { dir = 2; } else
+        if(a == S) { dir = 3; }
+        // Apply move direction.
+        if(dir == 0) { x -= 1;} else
+        if(dir == 1) { x += 1;} else
+        if(dir == 2) { y -= 1;} else
+        if(dir == 3) { y += 1;}
+        // Out of bounds fix.
+        if(x == xm) { x = 0 ;     } else
+        if(x == -1) { x = xm - 1; } else
+        if(y == -1) { y = ym - 1; } else
+        if(y == ym) { y = 0 ;     };
+        // Draw. If collision, clear the screen.
+        if(draw(x, y, dot)) { clear(); }
+    }
+}

examples/invaders.c8

@@ -0,0 +1,102 @@
+alien = { 0x18, 0x3C, 0x7E, 0xDB, 0xFF, 0x24, 0x5A, 0xA5, };
+
+gun = { 0x10, 0x38, };
+
+bullet = { 0x10 };
+
+move_gun(x)
+{
+    auto dir = getchar();
+    auto left = 7;
+    auto right = 9;
+    if(dir == left)
+    {
+        return x -= 1;
+    }
+    else if(dir == right)
+    {
+        return x += 1;
+    }
+    else
+    {
+        return x += 0;
+    }
+}
+
+shoot_gun()
+{
+    return getchar() == 5;
+}
+
+draw_aliens()
+{
+    auto start = 3;
+    auto x = 50;
+    while(x)
+    {
+        draw(start + x, 0, alien);
+        x -= 10;
+    }
+    draw(start, 0, alien);
+}
+
+draw_gun(x, ymax, init)
+{
+    auto y = ymax - sizeof(gun);
+    if(init)
+    {
+        draw(x, y, gun);
+    }
+    draw(x, y, gun);
+    x = move_gun(x);
+    draw(x, y, gun);
+    return x;
+}
+
+draw_bullet(x, y, tip)
+{
+    if(y == tip)
+    {
+        draw(x, y, bullet);
+    }
+    draw(x, y, bullet);
+    if(draw(x, y - 1, bullet))
+    {
+        return 0;
+    }
+    else
+    {
+        return y -= 1;
+    }
+}
+
+main()
+{
+    auto x = 0;
+    auto ymax = 32;
+    auto tip = ymax - sizeof(gun);
+    auto bx = 0;
+    auto by = 0;
+    auto shooting = 0;
+    auto init = 1;
+    draw_aliens();
+    while(1)
+    {
+        x = draw_gun(x, ymax, init);
+        if(shoot_gun())
+        {
+            bx = x;
+            by = tip;
+            shooting = 1;
+        }
+        if(by == 0)
+        {
+            shooting = 0;
+        }
+        if(shooting)
+        {
+            by = draw_bullet(bx, by, tip);
+        }
+        init = 0;
+    }
+}