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glut.js
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/**
* Created by screw on 21.02.2015.
*/
(function() {
"use strict";
window.Glut = {
getGL: function(canvas) {
var gl =
canvas.getContext("webgl") ||
canvas.getContext("experimental-webgl");
gl.viewport(0, 0, canvas.width, canvas.height);
return gl;
},
getProgram: function(gl, vshader_id, fshader_id) {
var vshader = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vshader, document.getElementById(vshader_id).text);
gl.compileShader(vshader);
if (!gl.getShaderParameter(vshader, gl.COMPILE_STATUS)) {
console.error(gl.getShaderInfoLog(vshader));
}
var fshader = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fshader, document.getElementById(fshader_id).text);
gl.compileShader(fshader);
if (!gl.getShaderParameter(fshader, gl.COMPILE_STATUS)) {
console.error(gl.getShaderInfoLog(fshader));
}
var program = gl.createProgram();
gl.attachShader(program, vshader);
gl.attachShader(program, fshader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
console.error(gl.getProgramInfoLog(program));
}
gl.useProgram(program);
return program;
},
getGLVars: function(gl, program, vars) {
var gl_vars = {};
var attributes = vars.attributes || [];
var uniforms = vars.uniforms || [];
attributes.forEach(function(att) {
gl_vars[att] = gl.getAttribLocation(program, att);
});
uniforms.forEach(function(u) {
gl_vars[u] = gl.getUniformLocation(program, u);
});
return gl_vars;
},
setBuffer: function(gl, attribute, data, item_size, type) {
type = type || gl.FLOAT;
var buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, data, gl.STATIC_DRAW);
gl.vertexAttribPointer(attribute, item_size, type, false, 0, 0);
gl.enableVertexAttribArray(attribute);
buffer.size = data.length / item_size;
return buffer;
},
setIndexBuffer: function(gl, data) {
var buffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, data, gl.STATIC_DRAW);
buffer.size = data.length;
return buffer;
},
enableBuffer: function(gl, attribute, buffer, item_size) {
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.vertexAttribPointer(attribute, item_size, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(attribute);
return buffer;
},
enableIndexBuffer: function(gl, buffer) {
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer);
},
loadTexture: function(gl, texture_unit, texture_image, options) {
options = options || {};
var texture = gl.createTexture();
var mag_filter = options.mag_filter || gl.LINEAR;
var min_filter = options.min_filter || gl.LINEAR_MIPMAP_NEAREST;
var wrap_s = options.wrap_s || gl.REPEAT;
var wrap_t = options.wrap_t || gl.REPEAT;
gl.activeTexture(texture_unit);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
gl.RGBA,
gl.UNSIGNED_BYTE,
texture_image
);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, mag_filter);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, min_filter);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, wrap_s);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, wrap_t);
if (
min_filter === gl.LINEAR_MIPMAP_NEAREST ||
min_filter === gl.LINEAR_MIPMAP_LINEAR
) {
gl.generateMipmap(gl.TEXTURE_2D);
}
return texture;
},
cube: {
// Create a cube
// v6------v5
// /| /|
// v1------v0|
// | | | |
// | |v7---|-|v4
// |/ |/
// v2------v3
vertices: new Float32Array([
1.0,
1.0,
1.0,
-1.0,
1.0,
1.0,
-1.0,
-1.0,
1.0,
1.0,
-1.0,
1.0, // v0-v1-v2-v3 front
1.0,
1.0,
1.0,
1.0,
-1.0,
1.0,
1.0,
-1.0,
-1.0,
1.0,
1.0,
-1.0, // v0-v3-v4-v5 right
1.0,
1.0,
1.0,
1.0,
1.0,
-1.0,
-1.0,
1.0,
-1.0,
-1.0,
1.0,
1.0, // v0-v5-v6-v1 up
-1.0,
1.0,
1.0,
-1.0,
1.0,
-1.0,
-1.0,
-1.0,
-1.0,
-1.0,
-1.0,
1.0, // v1-v6-v7-v2 left
-1.0,
-1.0,
-1.0,
1.0,
-1.0,
-1.0,
1.0,
-1.0,
1.0,
-1.0,
-1.0,
1.0, // v7-v4-v3-v2 down
1.0,
-1.0,
-1.0,
-1.0,
-1.0,
-1.0,
-1.0,
1.0,
-1.0,
1.0,
1.0,
-1.0 // v4-v7-v6-v5 back
]),
colors: new Float32Array([
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0, // v0-v1-v2-v3 front
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1,
0, // v0-v3-v4-v5 right
1,
1,
0,
1,
1,
0,
1,
1,
0,
1,
1,
0, // v0-v5-v6-v1 up
1,
0,
1,
1,
0,
1,
1,
0,
1,
1,
0,
1, // v1-v6-v7-v2 left
0,
0,
1,
0,
0,
1,
0,
0,
1,
0,
0,
1, // v7-v4-v3-v2 down
0,
1,
1,
0,
1,
1,
0,
1,
1,
0,
1,
1 // v4-v7-v6-v5 back
]),
normals: new Float32Array([
0.0,
0.0,
1.0,
0.0,
0.0,
1.0,
0.0,
0.0,
1.0,
0.0,
0.0,
1.0, // v0-v1-v2-v3 front
1.0,
0.0,
0.0,
1.0,
0.0,
0.0,
1.0,
0.0,
0.0,
1.0,
0.0,
0.0, // v0-v3-v4-v5 right
0.0,
1.0,
0.0,
0.0,
1.0,
0.0,
0.0,
1.0,
0.0,
0.0,
1.0,
0.0, // v0-v5-v6-v1 up
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0, // v1-v6-v7-v2 left
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0, // v7-v4-v3-v2 down
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0,
0.0,
0.0,
-1.0 // v4-v7-v6-v5 back
]),
indices: new Uint8Array([
0,
1,
2,
0,
2,
3, // front
4,
5,
6,
4,
6,
7, // right
8,
9,
10,
8,
10,
11, // up
12,
13,
14,
12,
14,
15, // left
16,
17,
18,
16,
18,
19, // down
20,
21,
22,
20,
22,
23 // back
])
}
};
})();