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Finished first pass of 100% integer math for sprites.

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This commit is contained in:
Martin Haye 2013-10-20 10:27:38 -07:00
parent 20dd825927
commit fe747eedfe
1 changed files with 25 additions and 5 deletions
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28
Platform/Apple/virtual/src/raycast/javascript/intcast.js
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@ -51,7 +51,7 @@ var player = {
x : 7.0, // current x, y position
y : 10.5,
dir : 0, // the direction that the player is turning, either -1 for left or 1 for right.
angleNum : 0, // the current angle of rotation
angleNum : 1, // the current angle of rotation
speed : 0, // is the playing moving forward (speed = 1) or backwards (speed = -1).
moveSpeed : 0.25, // how far (in map units) does the player move each step/update
rotSpeed : 22.5 * Math.PI / 180 // how much does the player rotate each step/update (in radians)
@ -374,6 +374,8 @@ function renderSprites() {
var wLog256 = log2_w_w(256);
var wLogViewDist = log2_w_w(viewDist*256);
for (var i=0;i<visibleSprites.length;i++) {
var sprite = visibleSprites[i];
var img = sprite.img;
@ -388,28 +390,46 @@ function renderSprites() {
var ry = (dx * sinT) + (dy * cosT);
var bSgnDx = (dx < 0) ? -1 : 1;
var wLogDx = log2_w_w(Math.abs(dx)*256);
var wLogDx = log2_w_w(uword(Math.abs(dx)*256));
var bSgnDy = (dy < 0) ? -1 : 1;
var wLogDy = log2_w_w(Math.abs(dy)*256);
var wLogDy = log2_w_w(uword(Math.abs(dy)*256));
var wRx = bSgnDx*bSgnCosT*pow2_w_w(wLogDx + wLogCosT - wLog256) -
bSgnDy*bSgnSinT*pow2_w_w(wLogDy + wLogSinT - wLog256);
var wRy = bSgnDx*bSgnSinT*pow2_w_w(wLogDx + wLogSinT - wLog256) +
bSgnDy*bSgnCosT*pow2_w_w(wLogDy + wLogCosT - wLog256);
console.log("Sprite " + sprite.index + ": rx=" + rx + ", wRx/256 = " + (wRx/256.0));
if (options & 1) {
rx = wRx / 256.0;
ry = wRy / 256.0;
}
//console.log("Sprite " + sprite.index + ": rx=" + rx + ", wRx/256=" + (wRx/256.0) + ", ry=" + ry + ", wRy/256=" + (wRy/256.0));
var sqDist = rx*rx + ry*ry;
var dist = Math.sqrt(sqDist);
var wLogSqRx = Math.max(0, (log2_w_w(Math.abs(wRx)) << 1) - wLog256);
var wLogSqRy = Math.max(0, (log2_w_w(Math.abs(wRy)) << 1) - wLog256);
var wSqDist = pow2_w_w(wLogSqRx) + pow2_w_w(wLogSqRy);
var wLogDist = ((log2_w_w(wSqDist)-wLog256) >> 1) + wLog256;
//console.log("Sprite " + sprite.index + ": sqRx=" + (rx*rx) + ", wSqRx=" + (pow2_w_w(wLogSqRx)/256.0) + ", sqRy=" + (ry*ry) + ", wSqRy=" + (pow2_w_w(wLogSqRy)/256.0));
//console.log("Sprite " + sprite.index + ": sqDist=" + sqDist + ", wSqDist/256=" + (wSqDist/256.0));
//console.log("Sprite " + sprite.index + ": dist=" + dist + ", logDist=" + log2_w_w(dist*256) + ", wLogDist=" + wLogDist);
// size of the sprite
var size = viewDist / dist;
if (size <= 0) continue;
var wSize = pow2_w_w(wLogViewDist - wLogDist);
//console.log("Sprite " + sprite.index + ": size=" + size + ", wSize=" + vSize);
// x-position on screen
var x = ry / dist * 252 / 0.38268343236509034;
var bSgnRy = wRy < 0 ? -1 : 1;
var wX = bSgnRy * pow2_w_w(log2_w_w(Math.abs(wRy)*256) - wLogDist + log2_w_w(252 / 0.38268343236509034) - wLog256);
//console.log("Sprite " + sprite.index + ": x=" + x + ", wX=" + wX);
if (options & 1) {
size = wSize;
x = wX;
}
img.style.left = (screenWidth/2 + x - size/2) + "px";
// y is constant since we keep all sprites at the same height and vertical position