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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCanvas3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
Qt.include("../../../../examples/canvas3d/canvas3d/3rdparty/gl-matrix.js")
var gl;
var mvMatrix = mat4.create();
var pMatrix = mat4.create();
var colorBuffer;
var pMatrixUniform;
var mvMatrixUniform;
var vertexPositionAttribute;
var vertexColorAttribute;
function initializeGL(canvas) {
gl = canvas.getContext("");
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
var pixelRatio = canvas.devicePixelRatio;
gl.viewport(0, 0, pixelRatio * canvas.width, pixelRatio * canvas.height);
initShaders();
initBuffers();
mat4.perspective(pMatrix, degToRad(45), canvas.width / canvas.height, 0.1, 500.0);
gl.uniformMatrix4fv(pMatrixUniform, false, pMatrix);
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, mvMatrix, [0, 0, -5]);
gl.uniformMatrix4fv(mvMatrixUniform, false, mvMatrix);
}
function paintGL() {
gl.clearColor(1.0, 0.0, 0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
}
function paintGL(x, y) {
gl.clearColor(64.0 / 255.0, 80.0 / 255.0, 96.0 / 255.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
var pixels = checkPixel(x, y);
return pixels;
}
function checkPixel(x, y) {
var pixels = new Uint8Array(4);
gl.readPixels(x, y, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
return pixels;
}
function setColor(r, g, b, a) {
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
var colors = [r / 255.0, g / 255.0, b / 255.0, a / 255.0];
var generatedColors = [];
for (var i = 0; i < 4; i++)
generatedColors = generatedColors.concat(colors);
gl.bufferData(gl.ARRAY_BUFFER,
new Float32Array(generatedColors),
gl.STATIC_DRAW);
gl.enableVertexAttribArray(vertexColorAttribute);
gl.vertexAttribPointer(vertexColorAttribute, 4, gl.FLOAT, false, 0, 0);
}
function initBuffers()
{
var vertexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);
gl.bufferData(gl.ARRAY_BUFFER,
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]),
gl.STATIC_DRAW);
gl.enableVertexAttribArray(vertexPositionAttribute);
gl.vertexAttribPointer(vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0);
colorBuffer = gl.createBuffer();
setColor(16.0, 32.0, 48.0, 255.0);
var uvBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, uvBuffer);
gl.bufferData(gl.ARRAY_BUFFER,
new Float32Array([1.0, 0.0,
0.0, 0.0,
0.0, 1.0,
1.0, 1.0]),
gl.STATIC_DRAW);
var indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER,
new Uint16Array([0, 1, 2,
0, 2, 3]),
gl.STATIC_DRAW);
}
function initShaders()
{
var vertexShader = getShader(
gl,
"attribute highp vec3 aVertexPosition; \
attribute mediump vec4 aVertexColor; \
uniform mat4 uMVMatrix; \
uniform mat4 uPMatrix; \
varying mediump vec4 vColor; \
void main(void) { \
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0); \
vColor = aVertexColor; \
}",
gl.VERTEX_SHADER);
var fragmentShader = getShader(
gl,
"varying mediump vec4 vColor; \
uniform sampler2D uSampler; \
void main(void) { \
gl_FragColor = vColor; \
}",
gl.FRAGMENT_SHADER);
var shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
gl.deleteShader(vertexShader);
gl.deleteShader(fragmentShader);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
console.log("Could not initialize shaders");
console.log(gl.getProgramInfoLog(shaderProgram));
}
gl.useProgram(shaderProgram);
vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(vertexPositionAttribute);
vertexColorAttribute = gl.getAttribLocation(shaderProgram, "aVertexColor");
gl.enableVertexAttribArray(vertexColorAttribute);
pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
}
function getShader(gl, str, type) {
var shader = gl.createShader(type);
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
console.log("JS:Shader compile failed");
console.log(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
function degToRad(degrees) {
return degrees * Math.PI / 180;
}
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