Everyone loves random

7 files changed, 72 insertions, 13 deletions

diff --git a/src/config.h b/src/config.h
new file mode 100644
index 0000000..fc12544
--- /dev/null
+++ b/src/config.h
@@ -0,0 +1,17 @@
+#pragma once
+
+typedef int i32;
+typedef long long i64;
+
+typedef unsigned int u32;
+typedef unsigned long long u64;
+
+typedef float f32;
+typedef double f64;
+
+// 24.8 format
+typedef i32 fx32;
+#define FIXED_POINT_BITS 8
+#define FIXED_POINT_ONE (1 << FIXED_POINT_BITS)
+#define TO_FIXED(x) ((fx32)(x) << FIXED_POINT_BITS)
+#define FROM_FIXED(x) ((x) >> FIXED_POINT_BITS)
\ No newline at end of file
diff --git a/src/rand_sys.c b/src/rand_sys.c
new file mode 100644
index 0000000..679ac94
--- /dev/null
+++ b/src/rand_sys.c
@@ -0,0 +1,41 @@
+#include "rand_sys.h"
+
+#define WIN32_LEAN_AND_MEAN
+#define NOSERVICE
+#define NOMCX
+#define NOIME
+#include <windows.h>
+
+static u32 state[2];
+
+void rand_seed(void)
+{
+	FILETIME t; 
+	GetSystemTimeAsFileTime(&t);
+	
+	u32 val = t.dwLowDateTime;
+	val ^= val >> 16;
+    val *= 0x85ebca6b;
+    val ^= val >> 13;
+    val *= 0xc2b2ae35;
+    val ^= val >> 16;
+	
+	state[0] = val;
+	state[1] = val ^ 0x49616e42U;
+}
+
+u32 rand_u32(void)
+{
+	state[0] = (state[0] << 16) + (state[0] >> 16);
+    state[0] += state[1];
+    state[1] += state[0];
+    return state[0];
+}
+
+i32 rand_range(i32 min, i32 max)
+{
+	u32 range = (u32)(max - min + 1);
+    u32 num = rand_u32() % range;
+
+    return min + (i32)num;
+}
\ No newline at end of file
diff --git a/src/rand_sys.h b/src/rand_sys.h
new file mode 100644
index 0000000..75198a0
--- /dev/null
+++ b/src/rand_sys.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "config.h"
+
+// Based on mattiasgustavsson's rnd.h header
+
+void rand_seed(void);
+
+u32 rand_u32(void);
+
+int rand_range(i32 min, i32 max);
\ No newline at end of file
diff --git a/src/random.h b/src/random.h
deleted file mode 100644
index 0c3845f..0000000
--- a/src/random.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#pragma once
-
-#include "utils.h"
-
-// Based on mattiasgustavsson's rnd.h header
-
-void rand_init(void);
-
-u32 rand_u32(void);
-
-fx32 rand_fx32(void);
-
-int rand_i32_range(i32 min, i32 max);
\ No newline at end of file
diff --git a/src/shader_sys.h b/src/shader_sys.h
index d0eff2c..1e30d7d 100644
--- a/src/shader_sys.h
+++ b/src/shader_sys.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "utils.h"
+#include "config.h"
 
 void init_shader_sys(void);
 
diff --git a/src/texture_sys.h b/src/texture_sys.h
index a5ed941..50adc3a 100644
--- a/src/texture_sys.h
+++ b/src/texture_sys.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "utils.h"
+#include "config.h"
 
 void init_tex_sys(void);
 
diff --git a/src/utils.h b/src/utils.h
index 92f64ba..079445a 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -19,5 +19,6 @@ typedef double f64;
 // 24.8 format
 typedef i32 fx32;
 #define FIXED_POINT_BITS 8
+#define FIXED_POINT_ONE (1 << FIXED_POINT_BITS)
 #define TO_FIXED(x) ((fx32)(x) << FIXED_POINT_BITS)
 #define FROM_FIXED(x) ((x) >> FIXED_POINT_BITS)
\ No newline at end of file