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| 1 | float posX = 9, posY = 12.5; | |
| 2 | float dirX = -1, dirY = 0; | |
| 3 | float planeX = 0, planeY = 0.9; | |
| 4 | float time = 0, oldTime = 0; | |
| 5 | ||
| 6 | float cameraX, rayPosX, rayPosY, rayDirX, rayDirY, sideDistX, sideDistY, deltaDistX, deltaDistY, perpWallDist, frameTime, moveSpeed, rotSpeed, oldDirX, oldPlaneX; | |
| 7 | int x, y, mapX, mapY, stepX, stepY, hit, side, lineHeight, drawStart, drawEnd; | |
| 8 | ||
| 9 | - | cameraX = fdiv(FIX(2 * x), FIX(screenWidth)) - FIX(1); |
| 9 | + | cameraX = 2 * x / (float)(screenWidth) -1; |
| 10 | rayPosX = posX; | |
| 11 | rayPosY = posY; | |
| 12 | - | rayDirX = dirX + fmul(planeX, cameraX); |
| 12 | + | rayDirX = dirX + planeX * cameraX; |
| 13 | - | rayDirY = dirY + fmul(planeY, cameraX); |
| 13 | + | rayDirY = dirY + planeY * cameraX; |
| 14 | ||
| 15 | - | mapX = UNFIX(rayPosX); |
| 15 | + | mapX = (int)(rayPosX); |
| 16 | - | mapY = UNFIX(rayPosY); |
| 16 | + | mapY = (int)(rayPosY); |
| 17 | - | deltaDistX = ftofix(SquareRootFloat(fixtof(FIX(1) + fdiv(fmul(rayDirY, rayDirY), fmul(rayDirX, rayDirX))))); |
| 17 | + | deltaDistX = SquareRootFloat(1 + (rayDirY * rayDirY) / (rayDirX * rayDirX)); |
| 18 | - | deltaDistY = ftofix(SquareRootFloat(fixtof(FIX(1) + fdiv(fmul(rayDirX, rayDirX), fmul(rayDirY, rayDirY))))); |
| 18 | + | deltaDistY = SquareRootFloat(1 + (rayDirX * rayDirX) / (rayDirY * rayDirY)); |
| 19 | hit = 0; | |
| 20 | ||
| 21 | - | if (rayDirX < FIX(0)) |
| 21 | + | if (rayDirX < 0) |
| 22 | {
| |
| 23 | stepX = -1; | |
| 24 | - | sideDistX = fmul(rayPosX - FIX(mapX), deltaDistX); |
| 24 | + | sideDistX = (rayPosX - mapX) * deltaDistX; |
| 25 | } | |
| 26 | else | |
| 27 | {
| |
| 28 | stepX = 1; | |
| 29 | - | sideDistX = fmul(FIX(mapX + 1) - rayPosX, deltaDistX); |
| 29 | + | sideDistX = (mapX + 1.0 - rayPosX) * deltaDistX; |
| 30 | } | |
| 31 | - | if (rayDirY < FIX(0)) |
| 31 | + | if (rayDirY < 0) |
| 32 | {
| |
| 33 | stepY = -1; | |
| 34 | - | sideDistY = fmul(rayPosY - FIX(mapY), deltaDistY); |
| 34 | + | sideDistY = (rayPosY - mapY) * deltaDistY; |
| 35 | } | |
| 36 | else | |
| 37 | {
| |
| 38 | stepY = 1; | |
| 39 | - | sideDistY = fmul(FIX(mapY + 1) - rayPosY, deltaDistY); |
| 39 | + | sideDistY = (mapY + 1.0 - rayPosY) * deltaDistY; |
| 40 | } | |
| 41 | ||
| 42 | while (hit == 0) | |
| 43 | {
| |
| 44 | if (sideDistX < sideDistY) | |
| 45 | {
| |
| 46 | sideDistX += deltaDistX; | |
| 47 | mapX += stepX; | |
| 48 | side = 0; | |
| 49 | } | |
| 50 | else | |
| 51 | {
| |
| 52 | sideDistY += deltaDistY; | |
| 53 | mapY += stepY; | |
| 54 | side = 1; | |
| 55 | } | |
| 56 | ||
| 57 | if (worldMap[mapX][mapY] > 0) hit = 1; | |
| 58 | } |
