ConFPS.cpp

#include <iostream>
#include <Windows.h>

using namespace std;

int nScreenWidth = 120;
int nScreenHeight = 40;

float fPlayerX = 0.0f;
float fPlayerY = 0.0f;
float fPlayerA = 0.0f;

int nMapHeight = 16;
int nMapWidth = 16;

int fFOV = 3.14159 / 4.0;
float fDepth = 16.0;

int main() {
	// Create Screen Buffer
	wchar_t* screen = new wchar_t[nScreenWidth * nScreenHeight];
	HANDLE hConsole = CreateConsoleScreenBuffer(GENERIC_READ | GENERIC_WRITE, 0, NULL, CONSOLE_TEXTMODE_BUFFER, NULL);
	SetConsoleActiveScreenBuffer(hConsole);

	DWORD dwBytesWritten = 0;

	wstring map;

	// Define Empty Room (# = borders, . = empty space)
	map += L"################";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"#..............#";
	map += L"################";

	// Game loop
	while (true) {
		for (int x = 0; x < nScreenWidth; ++x) {
			// Potter Algorithm: Calculating the projected ray angle into world space
			float fRayAngle = (fPlayerA - fFOV / 2.0f) + ((float)x / (float)nScreenWidth) * fFOV;

			float fDistanceToWall = 0;
			bool bHitWall = false;

			float fEyeX = sinf(fRayAngle);
			float fEyeY = cosf(fRayAngle);

			while (!bHitWall && fDistanceToWall < fDepth) {
				fDistanceToWall += 0.1f;

				int nTestX = (int)(fPlayerX + fEyeX * fDistanceToWall);
				int nTestY = (int)(fPlayerY + fEyeY * fDistanceToWall);

				// Test if ray is out of bounds
				if (nTestX < 0 || nTestX >= nMapWidth || nTestY < 0 || nTestY >= nMapHeight) {
					bHitWall = true;
					fDistanceToWall = fDepth; // Set distance to maximum depth if out of bounds
				}
				else {
					// Ray is inbounds so test to see if the ray cell is a wall block
					if (map[nTestY * nMapWidth + nTestX] == '#') {
						bHitWall = true;
					}
				}
			}

		}
	}

	screen[nScreenWidth * nScreenHeight - 1] = '\0';
	WriteConsoleOutputCharacter(hConsole, screen, nScreenWidth * nScreenHeight, { 0, 0 }, &dwBytesWritten);

	return 0;
}