From aadff4d1cf17cc23f6f38ab0da51baabfeb9f9d1 Mon Sep 17 00:00:00 2001
From: Raymaekers Luca <luca@spacehb.net>
Date: Wed, 1 Oct 2025 16:53:49 +0200
Subject: checkpoint

---
 code/game.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 code/game.c

(limited to 'code/game.c')

diff --git a/code/game.c b/code/game.c
new file mode 100644
index 0000000..8b37c99
--- /dev/null
+++ b/code/game.c
@@ -0,0 +1,103 @@
+
+// TODO: figure out how to get those from javascript, because they are going to be different in WASM64
+typedef int s32;
+typedef unsigned int u32;
+typedef unsigned char u8;
+typedef float r32;
+typedef int b32;
+#define true 1
+#define false 0
+
+#define local_persist static
+#define global static
+#define internal static
+
+#define WIDTH (1920/2)
+#define HEIGHT (1080/2)
+#define BYTES_PER_PIXEL 4
+
+#define STB_SPRINTF_IMPLEMENTATION
+#include "libs/stb_sprintf.h"
+
+//- Global variables
+extern u8 __heap_base;
+u32 BumpPointer = (u32)&__heap_base;
+u8 Buffer[WIDTH*HEIGHT*BYTES_PER_PIXEL];
+
+//- Extern (js) functions
+extern void LogMessage(u32 Length, char* message);
+
+//- Memory
+void* Malloc(u32 Size)
+{
+    u32 Result = BumpPointer;
+    Result += Size;
+    return (void *)Result;
+}
+
+void Free(u32 Size)
+{
+    BumpPointer -= Size;
+}
+
+//- Game
+u32 GetBufferWidth() { return WIDTH; }
+u32 GetBufferHeight() { return HEIGHT; }
+u32 GetBytesPerPixel() { return BYTES_PER_PIXEL; }
+
+void Logf(char *Format, ...)
+{
+    char MessageBuffer[256] = {0};
+    
+    va_list Args;
+    va_start(Args, Format);
+    u32 MessageLength = stbsp_vsprintf(MessageBuffer, Format, Args);
+    
+    LogMessage(MessageLength, MessageBuffer);
+}
+
+void RenderGradient(s32 Width, s32 Height, r32 dtForFrame)
+{
+    local_persist s32 Counter = 0;
+    local_persist b32 Toggle = true;
+    for(s32 Y = 0; Y < Height; Y++)
+    {
+        for(s32 X = 0; X < Width; X++)
+        {
+            r32 R = 0;
+            r32 G = 0;
+            r32 B = 0;
+            
+            if(Toggle)
+            {
+                R = 1.0f - ((r32)Counter/(r32)Width);
+                G = ((r32)Counter/(r32)Width);
+            }
+            else
+            {
+                G = 1.0f - (r32)Counter/(r32)Width;
+                R = (r32)Counter/(r32)Width;
+            }
+            
+            // AA BB GG RR
+            u32 Color = ((0xFF << 24) |
+                         ((u32)(0xFF * B) << 16) |
+                         ((u32)(0xFF * G) << 8)  |
+                         ((u32)(0xFF * R) << 0)); 
+            
+            ((u32 *)Buffer)[Y*Width + X] = Color;
+        }
+    }
+    
+    Counter += (dtForFrame * 1000) * .3;
+    if(Counter > Width)
+    {
+        Counter -= Width;
+        Toggle = !Toggle;
+    }
+    
+#if 1    
+    Logf("%d", Width);
+#endif
+    
+}
\ No newline at end of file
-- 
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