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// NOTE(luca): Image buffer format is AA BB GG RR
//~ Types
// TODO: figure out how to get those from javascript, because they are going to be different in WASM64
typedef signed char s8;
typedef signed short s16;
typedef signed int s32;
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
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
//~ Libraries
#define STB_SPRINTF_IMPLEMENTATION
#include "libs/stb_sprintf.h"
//~ Global variables
// From WASM
extern u8 __heap_base;
// Memory
u32 BumpPointer = (u32)&__heap_base;
u32 BumpAllocated = 0;
// Image
u8 Buffer[WIDTH*HEIGHT*BYTES_PER_PIXEL];
//~ Functions
//- Platform (js)
extern void LogMessage(u32 Length, char* message);
//- Memory
void* Malloc(u32 Size)
{
u32 Result = BumpPointer + BumpAllocated;
BumpAllocated += Size;
return (void *)Result;
}
void Free(u32 Size)
{
BumpAllocated -= 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
RenderRectangle(u8 *Buffer, s32 Pitch, s32 Width, s32 Height, s32 BytesPerPixel,
s32 MinX, s32 MinY, s32 MaxX, s32 MaxY, u32 Color)
{
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;
}
}
void
UpdateAndRender(s32 Width, s32 Height, s32 BytesPerPixel,
r32 dtForFrame, b32 MouseDown, s32 MouseX, s32 MouseY)
{
#if 1
// Clear the buffer to black.
{
u32 *Clear = (u32 *)Buffer;
s32 ClearSize = Width*Height;
while(ClearSize--) *Clear++ = 0xFF000000;
}
#endif
u32 Color = 0;
if(MouseDown)
{
Color = 0xFF00FF00;
}
u32 Pitch = BytesPerPixel * Width;
s32 Size = 5;
s32 MinX = MouseX - Size;
s32 MaxX = MouseX + Size;
s32 MinY = MouseY - Size;
s32 MaxY = MouseY + Size;
RenderRectangle(Buffer, Pitch, Width, Height, BytesPerPixel,
MinX, MinY, MaxX, MaxY, Color);
#if 1
Logf("(%d, %d) / %s",
MouseX, MouseY, ((MouseDown) ? "down" : "up"));
#endif
}
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