first commit

templates/browser_random_number.html

@@ -0,0 +1,198 @@
+{% extends "base.html" %}
+
+{% block title %}Browser Random Generation{% endblock %}
+
+{% block content %}
+<div class="max-w-scree grid grid-cols-1 items-center divide-y">
+  <div class="flex justify-center pt-6">
+    <p class="text-2xl" id="browser-name">Detected Browser: Something</p>
+  </div>
+  <div class="flex justify-center pt-6">
+  <canvas id="randNumCanvas" width="1000" height="1000"></canvas>
+  </div>
+</div>
+{% endblock %}
+
+{% block js %}
+<script>
+"use strict";
+
+var vertexShaderSource = `#version 300 es
+
+// an attribute is an input (in) to a vertex shader.
+// It will receive data from a buffer
+in vec2 a_position;
+
+// Used to pass in the resolution of the canvas
+uniform vec2 u_resolution;
+
+// all shaders have a main function
+void main() {
+
+  // convert the position from pixels to 0.0 to 1.0
+  vec2 zeroToOne = a_position / u_resolution;
+
+  // convert from 0->1 to 0->2
+  vec2 zeroToTwo = zeroToOne * 2.0;
+
+  // convert from 0->2 to -1->+1 (clipspace)
+  vec2 clipSpace = zeroToTwo - 1.0;
+
+  gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1);
+}
+`;
+
+var fragmentShaderSource = `#version 300 es
+
+precision highp float;
+
+uniform vec4 u_color;
+
+// we need to declare an output for the fragment shader
+out vec4 outColor;
+
+void main() {
+  outColor = u_color;
+}
+`;
+
+function main() {
+  // Get A WebGL context
+  var canvas = document.querySelector("#randNumCanvas");
+  var gl = canvas.getContext("webgl2");
+  if (!gl) {
+    return;
+  }
+
+  // Use our boilerplate utils to compile the shaders and link into a program
+  var program = webglUtils.createProgramFromSources(gl,
+      [vertexShaderSource, fragmentShaderSource]);
+
+  // look up where the vertex data needs to go.
+  var positionAttributeLocation = gl.getAttribLocation(program, "a_position");
+
+  // look up uniform locations
+  var resolutionUniformLocation = gl.getUniformLocation(program, "u_resolution");
+  var colorLocation = gl.getUniformLocation(program, "u_color");
+
+  // Create a buffer
+  var positionBuffer = gl.createBuffer();
+
+  // Create a vertex array object (attribute state)
+  var vao = gl.createVertexArray();
+
+  // and make it the one we're currently working with
+  gl.bindVertexArray(vao);
+
+  // Turn on the attribute
+  gl.enableVertexAttribArray(positionAttributeLocation);
+
+  // Bind it to ARRAY_BUFFER (think of it as ARRAY_BUFFER = positionBuffer)
+  gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
+
+  // Tell the attribute how to get data out of positionBuffer (ARRAY_BUFFER)
+  var size = 2;          // 2 components per iteration
+  var type = gl.FLOAT;   // the data is 32bit floats
+  var normalize = false; // don't normalize the data
+  var stride = 0;        // 0 = move forward size * sizeof(type) each iteration to get the next position
+  var offset = 0;        // start at the beginning of the buffer
+  gl.vertexAttribPointer(
+      positionAttributeLocation, size, type, normalize, stride, offset);
+
+  webglUtils.resizeCanvasToDisplaySize(gl.canvas);
+
+  // Tell WebGL how to convert from clip space to pixels
+  gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
+
+  // Clear the canvas
+  gl.clearColor(0, 0, 0, 0);
+  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
+
+  // Tell it to use our program (pair of shaders)
+  gl.useProgram(program);
+
+  // Bind the attribute/buffer set we want.
+  gl.bindVertexArray(vao);
+
+  // Pass in the canvas resolution so we can convert from
+  // pixels to clipspace in the shader
+  gl.uniform2f(resolutionUniformLocation, gl.canvas.width, gl.canvas.height);
+  //const array = new Uint16Array(30_000);
+  //const randNum = self.crypto.getRandomValues(array);
+  // draw 50 random rectangles in random colors
+  var primitiveType = gl.TRIANGLES;
+  var offset = 0;
+  var count = 6;
+  var counter = 0;
+  var array2D = [];
+  var y_cnt = 0;
+  var x_cnt = 0;
+  for (var size = 0; size < 1000; ++size) {
+    array2D[size] = self.crypto.getRandomValues(new Uint16Array(1000));
+  }
+  for (var y = 0; y < 2000; y = y + 2) {
+    for (var x = 0; x < 2000; x = x + 2) {
+      setRectangle(gl, x, y, 2, 2);
+      gl.uniform4f(colorLocation, 0.0, 0.0, 0.0, normalizeUint16(array2D[y/2][x/2]));
+      gl.drawArrays(primitiveType, offset, count);
+      counter++;
+    }
+  }
+}
+
+// Returns a random integer from 0 to range - 1.
+function randomInt(range) {
+  return Math.floor(Math.random() * range);
+}
+
+function normalizeUint16(val) {
+  return val/65535;
+  
+}
+
+// Fill the buffer with the values that define a rectangle.
+function setRectangle(gl, x, y, width, height) {
+  var x1 = x;
+  var x2 = x + width;
+  var y1 = y;
+  var y2 = y + height;
+  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
+     x1, y1,
+     x2, y1,
+     x1, y2,
+     x1, y2,
+     x2, y1,
+     x2, y2,
+  ]), gl.STATIC_DRAW);
+}
+
+main();
+
+</script>
+<script>
+// Function to detect the browser name
+function detectBrowser() {
+    var userAgent = navigator.userAgent;
+    if (userAgent.indexOf("Edg") > -1) {
+        return "Microsoft Edge";
+    } else if (userAgent.indexOf("Chrome") > -1) {
+        return "Chrome";
+    } else if (userAgent.indexOf("Firefox") > -1) {
+        return "Firefox";
+    } else if (userAgent.indexOf("Safari") > -1) {
+        return "Safari";
+    } else if (userAgent.indexOf("Opera") > -1) {
+        return "Opera";
+    } else if (userAgent.indexOf("Trident") > -1 || userAgent.indexOf("MSIE") > -1) {
+        return "Internet Explorer";
+    }
+
+    return "Unknown";
+}
+
+// Get the browser name and display it
+var browserName = detectBrowser();
+document.getElementById("browser-name").innerText = "Detected Browser: " + browserName;
+</script>
+
+{% endblock %}