122 lines
2.6 KiB
Plaintext
122 lines
2.6 KiB
Plaintext
var cam = {}
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/*
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presentation can be one of
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letterbox
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overscan
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stretch
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... or simply 'null' for no presentation
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*/
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var basecam = {
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pos: [0,0], // where it is
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ortho:true,
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width: 100,
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aspect_ratio: 16/9,
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fov:50,
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near_z:0,
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far_z:1000,
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anchor:[0.5,0.5],
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rotation:[0,0,0,1],
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presentation: "letterbox",
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background: {r:1,g:1,b:1,a:0},
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viewport: {x:0,y:0,width:1,height:1},
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}
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basecam.draw_rect = function(size)
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{
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var mode = this.presentation || "letterbox"
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var vp = {
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x:this.viewport.x,
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y:1-this.viewport.y-this.viewport.height,
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width:this.viewport.width,
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height:this.viewport.height
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}
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var src_rect = {x:0,y:0,width:this.size.x,height:this.size.y}
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var dst_rect = {x:vp.x*size.x,y:vp.y*size.y,width:vp.width*size.x,height:vp.height*size.y};
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return mode_rect(src_rect,dst_rect,mode);
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}
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basecam.screen2camera = function(pos)
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{
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var draw_rect = this.draw_rect(prosperon.window.size);
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var ret = [pos.x-draw_rect.x, pos.y - draw_rect.y];
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ret.x /= draw_rect.width;
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ret.y /= draw_rect.height;
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ret.y = 1 - ret.y;
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return ret;
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}
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basecam.screen2hud = function(pos)
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{
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var cam = this.screen2camera(pos);
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cam.x *= this.size.x;
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cam.y *= this.size.y;
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return cam;
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}
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basecam.screen2world = function(pos)
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{
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var hud = this.screen2hud(pos);
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hud.x += this.transform.pos.x - this.size.x/2;
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hud.y += this.transform.pos.y - this.size.y/2;
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return hud;
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}
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function mode_rect(src,dst,mode = "stretch")
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{
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var aspect_src = src.width/src.height;
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var aspect_dst = dst.width/dst.height;
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var out = {
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x:dst.x,
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y:dst.y,
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width:dst.width,
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height:dst.height
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};
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if (mode == "stretch") return out;
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if (mode == "letterbox") {
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if (aspect_src > aspect_dst) {
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var scaled_h = out.width/aspect_src;
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var off = (out.height - scaled_h) * 0.5;
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out.y += off;
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out.height = scaled_h;
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} else {
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var scaled_w =out.height * aspect_src;
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var off = (out.width - scaled_w) * 0.5;
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out.x += off;
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out.width = scaled_w;
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}
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} else if (mode == "overscan"){
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if (aspect_src > aspect_dst) {
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var scaled_w = out.height * aspect_src;
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var off = (out.width - scaled_w) * 0.5;
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out.x += off;
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out.width = scaled_w;
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} else {
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var scaled_h = out.width / aspect_src;
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var off = (out.height - scaled_h) * 0.5;
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out.y += off;
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out.height = scaled_h;
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}
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}
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return out;
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}
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cam.make = function()
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{
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var c = meme(basecam)
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c.transform = new transform
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c.transform.unit()
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c.size = [640,360]
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c.mode = 'keep'
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c.viewport = {x:0,y:0,width:1,height:1}
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c.fov = 45
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c.type = 'ortho'
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c.ortho = true
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c.aspect = 16/9
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return c
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}
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return cam
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