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// 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, s32 BytesPerPixel,
r32 dtForFrame, b32 MouseDown, s32 MouseX, s32 MouseY)
{
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 = 1.0f - ((r32)Counter/(r32)Width);
}
else
{
G = (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;
}
}
u32 Color = 0;
if(MouseDown)
{
Color = 0xFFFF0000;
}
u32 Pitch = BytesPerPixel * Width;
s32 Size = 5;
s32 MinX = MouseX - Size;
s32 MaxX = MouseX + Size;
s32 MinY = MouseY - Size;
s32 MaxY = MouseY + Size;
if(MinX < 0)
{
MinX = 0;
}
if(MaxX > Width)
{
MaxX = Width;
}
if(MinY < 0)
{
MinY = 0;
}
if(MaxY > Height)
{
MaxY = Height;
}
u8 *Row = ((u8 *)Buffer) + ((BytesPerPixel*MinX) + (Pitch*MinY));
for(s32 Y = MinY;
Y < MaxY;
Y++)
{
u32 *Pixel = (u32 *)Row;
for(s32 X = MinX;
X < MaxX;
X++)
{
*Pixel++ = Color;
}
Row += Pitch;
}
Counter += 1000 * dtForFrame * 0.5;
if(Counter > Width)
{
Counter -= Width;
Toggle = !Toggle;
}
#if 1
Logf("(%d, %d) / %s",
MouseX, MouseY, ((MouseDown) ? "down" : "up"));
#endif
}
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