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Separated floating point from integer versions of the sprite rendering routine.

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This commit is contained in:
Martin Haye 2013-11-03 08:51:09 -08:00
parent fe747eedfe
commit 77283e56b2
1 changed files with 59 additions and 26 deletions
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85
Platform/Apple/virtual/src/raycast/javascript/intcast.js
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@ -27,7 +27,7 @@ var itemTypes = [
{ img : "sprites/lamp.png", block : false } // 3
];
var mapItems = [
var allSprites = [
// lamps in center area
{type:3, x:9.5, y:7.5},
@ -139,8 +139,8 @@ function initSprites() {
var screen = $("screen");
for (var i=0;i<mapItems.length;i++) {
var sprite = mapItems[i];
for (var i=0;i<allSprites.length;i++) {
var sprite = allSprites[i];
var itemType = itemTypes[sprite.type];
var img = dc("img");
img.src = itemType.img;
@ -362,7 +362,7 @@ function clearSprites() {
visibleSprites = [];
}
function renderSprites() {
function intRenderSprites() {
var sinT = Math.sin(-playerAngle());
var cosT = Math.cos(-playerAngle());
@ -386,26 +386,16 @@ function renderSprites() {
var dy = sprite.y - player.y;
// Apply rotation to the position
var rx = (dx * cosT) - (dy * sinT);
var ry = (dx * sinT) + (dy * cosT);
var bSgnDx = (dx < 0) ? -1 : 1;
var wLogDx = log2_w_w(uword(Math.abs(dx)*256));
var bSgnDy = (dy < 0) ? -1 : 1;
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);
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 wRx = bSgnDx*bSgnCosT*pow2_w_w(wLogDx + wLogCosT - wLog256) -
bSgnDy*bSgnSinT*pow2_w_w(wLogDy + wLogSinT - wLog256);
// Calculate the distance
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);
@ -415,21 +405,61 @@ function renderSprites() {
//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);
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;
// Update the image with the calculated values
img.style.left = (screenWidth/2 + wX - wSize/2) + "px";
img.style.top = ((screenHeight-wSize)/2)+"px";
img.style.width = wSize + "px";
img.style.height = wSize + "px";
img.style.zIndex = wSize;
}
// hide the sprites that are no longer visible
for (var i=0;i<oldVisibleSprites.length;i++) {
var sprite = oldVisibleSprites[i];
if (visibleSprites.indexOf(sprite) < 0) {
console.log("No longer visible sprite " + sprite.index);
sprite.visible = false;
sprite.img.style.display = "none";
}
}
}
function floatRenderSprites() {
var sinT = Math.sin(-playerAngle());
var cosT = Math.cos(-playerAngle());
for (var i=0;i<visibleSprites.length;i++) {
var sprite = visibleSprites[i];
var img = sprite.img;
img.style.display = "block";
// translate position to viewer space
var dx = sprite.x - player.x;
var dy = sprite.y - player.y;
// Apply rotation to the position
var rx = (dx * cosT) - (dy * sinT);
var ry = (dx * sinT) + (dy * cosT);
var sqDist = rx*rx + ry*ry;
var dist = Math.sqrt(sqDist);
// size of the sprite
var size = viewDist / dist;
if (size <= 0) continue;
// x-position on screen
var x = ry / dist * 252 / 0.38268343236509034;
img.style.left = (screenWidth/2 + x - size/2) + "px";
// y is constant since we keep all sprites at the same height and vertical position
@ -600,7 +630,10 @@ function castRays(force)
drawStrip(rayNum, lineData[rayNum]);
// Render all the sprites
renderSprites();
if (options & 1)
floatRenderSprites();
else
intRenderSprites();
}
function assert(flg, msg) {