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No longer relying strictly on raycaster to determine visibility.

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This commit is contained in:
Martin Haye 2013-11-03 09:29:33 -08:00
parent 77283e56b2
commit 40b66f083b
1 changed files with 45 additions and 12 deletions
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57
Platform/Apple/virtual/src/raycast/javascript/intcast.js
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@ -40,10 +40,10 @@ var allSprites = [
// tables in long bottom room
{type:0, x:10.5, y:10.5},
{type:0, x:11.5, y:10.5},
{type:1, x:11.5, y:10.5},
// lamps in long bottom room
{type:3, x:8.5, y:10.5},
{type:3, x:11.5, y:10.5}
{type:3, x:9.5, y:10.5}
];
// Player attributes [ref BigBlue2_10]
@ -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 : 1, // the current angle of rotation
angleNum : 0, // 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)
@ -61,6 +61,8 @@ var options = 0;
var debugRay = null; /* Debugging info printed about this ray num, or null for none */
var debugSprite = 2; /* Debugging info printed about this sprite, or null for none */
var maxAngleNum = 16;
var mapWidth = 0;
@ -376,44 +378,75 @@ function intRenderSprites() {
var wLogViewDist = log2_w_w(viewDist*256);
for (var i=0;i<visibleSprites.length;i++) {
var sprite = visibleSprites[i];
for (var i=0;i<allSprites.length;i++) {
var sprite = allSprites[i];
var img = sprite.img;
img.style.display = "block";
if (sprite.index == debugSprite)
console.log("Sprite " + sprite.index + ":");
// translate position to viewer space
var dx = sprite.x - player.x;
var dy = sprite.y - player.y;
if (dx >= 16 || dx >= 16) {
if (sprite.index == debugSprite)
console.log(" Too far away to be visible (dx=" + dx + ", dy=" + dy + ")");
sprite.visible = false;
sprite.img.style.display = "none";
continue;
}
// Apply rotation to the position
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 wRy = bSgnDx*bSgnSinT*pow2_w_w(wLogDx + wLogSinT - wLog256) +
bSgnDy*bSgnCosT*pow2_w_w(wLogDy + wLogCosT - wLog256);
var wRx = bSgnDx*bSgnCosT*pow2_w_w(wLogDx + wLogCosT - wLog256) -
bSgnDy*bSgnSinT*pow2_w_w(wLogDy + wLogSinT - wLog256);
if (wRx < 0) {
if (sprite.index == debugSprite)
console.log(" behind viewer.");
sprite.visible = false;
sprite.img.style.display = "none";
continue;
}
var wRy = bSgnDx*bSgnSinT*pow2_w_w(wLogDx + wLogSinT - wLog256) +
bSgnDy*bSgnCosT*pow2_w_w(wLogDy + wLogCosT - 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);
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 wSize = pow2_w_w(wLogViewDist - wLogDist);
//console.log("Sprite " + sprite.index + ": size=" + size + ", wSize=" + vSize);
// x-position on screen
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 (sprite.index == debugSprite)
console.log(" wRx=" + wRx + ", wRy=" + wRy + ", wSize=" + wSize + ", wX=" + wX);
if (wX + wSize < 0) {
if (sprite.index == debugSprite)
console.log(" off-screen to left.");
sprite.visible = false;
sprite.img.style.display = "none";
continue;
}
else if (wX > screenWidth) {
if (sprite.index == debugSprite)
console.log(" off-screen to right.");
sprite.visible = false;
sprite.img.style.display = "none";
continue;
}
// Update the image with the calculated values
sprite.visible = true;
img.style.left = (screenWidth/2 + wX - wSize/2) + "px";
img.style.top = ((screenHeight-wSize)/2)+"px";
img.style.width = wSize + "px";