72 lines
1.7 KiB
JavaScript
72 lines
1.7 KiB
JavaScript
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"use strict" ;
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let gl;
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let viewLoc;
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let program;
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let objects = [];
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let posLoc,
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colorLoc;
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let lastTimestamp;
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function main() {
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// Get canvas and setup WebGL context
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const canvas = document.getElementById("gl-canvas");
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gl = canvas.getContext('webgl2');
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// Configure viewport
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gl.viewport(0,0,canvas.width,canvas.height);
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gl.clearColor(1.0,1.0,1.0,1.0);
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gl.enable(gl.DEPTH_TEST);
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// Init shader program via additional function and bind it
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program = initShaders(gl, "vertex-shader", "fragment-shader");
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gl.useProgram(program);
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// Get locations of shader variables
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posLoc = gl.getAttribLocation(program, "vPosition");
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colorLoc = gl.getAttribLocation(program, "vColor");
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// Create object instances
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let island = new Island();
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objects.push(island);
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let river = new River();
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objects.push(river);
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// View Matrix
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var mat = new Float32Array([
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0.1767766922712326 , -0.0589255653321743 , -0.013334667310118675 , 0 ,
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0 , 0.2357022613286972 , -0.006667333655059338 , 0 ,
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-0.1767766922712326 , -0.0589255653321743 , -0.013334667310118675 , 0 ,
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0 , 0 , -0.8801880478858948 , 1
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]);
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viewLoc = gl.getUniformLocation(program,"viewMatrix");
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gl.uniformMatrix4fv(viewLoc,false,mat);
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window.requestAnimationFrame(render);
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};
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function render(timestamp) {
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// Only clear once
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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if (lastTimestamp == undefined) {
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lastTimestamp = timestamp;
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}
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const elapsed = timestamp - lastTimestamp;
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// Call render function of each scene object
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// and don't mix up "of" and "in" up here, both keywords
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// are valid but have different meanings
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for(let object of objects) {
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object.Render();
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};
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window.requestAnimationFrame(render);
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}
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main();
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