nt-lite/code/shell/shell.c

#include <stdint.h>
#include <stddef.h>

void BitBlt(int x, int y, int w, int h, const uint32_t* pixels);
void* HeapAlloc(void* heap, unsigned long flags, size_t size);
int HeapFree(void* heap, unsigned long flags, void* mem);
_Noreturn void ExitProcess(unsigned int code);
_Noreturn void ExitThread(unsigned long code);
void OutputDebugStringA(const char* s);

int main() {
    OutputDebugStringA("Hello from the shell!\n");
    int width = 300;
    int height = 300;

    // Allocate space for uint32_t (4 bytes per pixel)
    uint32_t* image = (uint32_t *)HeapAlloc(NULL, 0, width * height * sizeof(uint32_t));
    
    int tileSize = 8;

    for (int y = 0; y < height; y++) {
        for (int x = 0; x < width; x++) {
            uint32_t color1 = 0xFFFFFFFF; // White
            uint32_t color2 = 0xFF000000; // Black

            int tileX = x / tileSize;
            int tileY = y / tileSize;

            if ((tileX + tileY) % 2 == 0) {
                image[y * width + x] = color1;
            } else {
                image[y * width + x] = color2;
            }
        }
    }

    // Pass the 32-bit buffer directly to BitBlt
    BitBlt(600, 400, width, height, image);

    // for (size_t i = 0; i < 1000000000; i++) {
    //     // burn!
    // }

    OutputDebugStringA("Goodbye from the shell!\n");

    ExitProcess(0);
}