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<!DOCTYPE html>
<!-- Ported from the OpenGL Samples Pack https://github.com/g-truc/ogl-samples/blob/master/tests/gl-320-texture-derivative.cpp and adapted from Mozilla's sample 5 https://github.com/mdn/webgl-examples/tree/gh-pages/tutorial/sample5 -->
<html lang="en">
<head>
<title>WebGL 2 Samples - texture_grad</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
<link rel="stylesheet" href="style.css">
<script src="third-party/gl-matrix-min.js"></script>
</head>
<body>
<div id="info">WebGL 2 Samples - texture_grad</div>
<p id="description">
This sample uses textureGrad for a texture lookup with explicit gradients for textures on each face of the cube.
</p>
<!-- WebGL 2 shaders -->
<script id="vs" type="x-shader/x-vertex">
#version 300 es
#define POSITION_LOCATION 0
#define TEXCOORD_LOCATION 4
precision highp float;
precision highp int;
uniform mat4 mvMatrix;
uniform mat4 pMatrix;
layout(location = POSITION_LOCATION) in vec3 position;
layout(location = TEXCOORD_LOCATION) in vec2 texcoord;
out vec2 v_uv;
out vec3 vPosition;
void main()
{
v_uv = texcoord;
vPosition = vec3(mvMatrix * vec4(position, 1.0));
gl_Position = pMatrix * mvMatrix * vec4(position, 1.0);
}
</script>
<script id="fs" type="x-shader/x-fragment">
#version 300 es
precision highp float;
precision highp int;
precision highp sampler2D;
uniform sampler2D diffuse;
in vec2 v_uv;
in vec3 vPosition;
out vec4 color;
void main()
{
vec2 size = vec2(textureSize(diffuse, 0));
vec2 dx = dFdx(v_uv * size);
vec2 dy = dFdy(v_uv * size);
color = textureGrad(diffuse, v_uv, dx, dy);
// Compute flat normal using gradient
vec3 fdx = vec3(dFdx(vPosition.x), dFdx(vPosition.y), dFdx(vPosition.z));
vec3 fdy = vec3(dFdy(vPosition.x), dFdy(vPosition.y), dFdy(vPosition.z));
vec3 N = normalize(cross(fdx, fdy));
color = mix(color, vec4(N, 1.0), 0.5);
}
</script>
<script src="utility.js"></script>
<script>
(function () {
'use strict';
var canvas = document.createElement('canvas');
canvas.width = Math.min(window.innerWidth, window.innerHeight);
canvas.height = canvas.width;
document.body.appendChild(canvas);
var gl = canvas.getContext( 'webgl2', { antialias: false } );
var isWebGL2 = !!gl;
if(!isWebGL2) {
document.getElementById('info').innerHTML = 'WebGL 2 is not available. See <a href="https://www.khronos.org/webgl/wiki/Getting_a_WebGL_Implementation">How to get a WebGL 2 implementation</a>';
return;
}
// -- Init program
var program = createProgram(gl, getShaderSource('vs'), getShaderSource('fs'));
var mvMatrixLocation = gl.getUniformLocation(program, 'mvMatrix');
var pMatrixLocation = gl.getUniformLocation(program, 'pMatrix');
var diffuseLocation = gl.getUniformLocation(program, 'diffuse');
// -- Init buffers
var positions = new Float32Array([
// Front face
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
// Back face
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
// Top face
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
// Bottom face
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
// Right face
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
// Left face
-1.0, -1.0, -1.0,
-1.0, -1.0, 1.0,
-1.0, 1.0, 1.0,
-1.0, 1.0, -1.0
]);
var vertexPosBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexPosBuffer);
gl.bufferData(gl.ARRAY_BUFFER, positions, gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
var texCoords = new Float32Array([
// Front face
0.0, 0.0,
0.0, 1.0,
1.0, 1.0,
1.0, 0.0,
// Back face
1.0, 1.0,
1.0, 0.0,
0.0, 0.0,
0.0, 1.0,
// Top face
1.0, 0.0,
0.0, 0.0,
0.0, 1.0,
1.0, 1.0,
// Bottom face
0.0, 0.0,
0.0, 1.0,
1.0, 1.0,
1.0, 0.0,
// Right face
0.0, 0.0,
0.0, 1.0,
1.0, 1.0,
1.0, 0.0,
// Left face
0.0, 0.0,
0.0, 1.0,
1.0, 1.0,
1.0, 0.0
]);
var vertexTexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexTexBuffer);
gl.bufferData(gl.ARRAY_BUFFER, texCoords, gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
// Element buffer
var indexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // front
4, 5, 6, 4, 6, 7, // back
8, 9, 10, 8, 10, 11, // top
12, 13, 14, 12, 14, 15, // bottom
16, 17, 18, 16, 18, 19, // right
20, 21, 22, 20, 22, 23 // left
];
// Now send the element array to GL
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
// -- Init VertexArray
var vertexArray = gl.createVertexArray();
gl.bindVertexArray(vertexArray);
var vertexPosLocation = 0; // set with GLSL layout qualifier
gl.enableVertexAttribArray(vertexPosLocation);
gl.bindBuffer(gl.ARRAY_BUFFER, vertexPosBuffer);
gl.vertexAttribPointer(vertexPosLocation, 3, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
var vertexTexLocation = 4; // set with GLSL layout qualifier
gl.enableVertexAttribArray(vertexTexLocation);
gl.bindBuffer(gl.ARRAY_BUFFER, vertexTexBuffer);
gl.vertexAttribPointer(vertexTexLocation, 2, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
gl.bindVertexArray(null);
// -- Init Texture
var imageUrl = '../assets/img/Di-3d.png';
var texture;
loadImage(imageUrl, function(image) {
// -- Init 2D Texture
texture = gl.createTexture();
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, false);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
// -- Allocate storage for the texture
gl.texStorage2D(gl.TEXTURE_2D, 1, gl.RGB8, 512, 512);
gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gl.RGB, gl.UNSIGNED_BYTE, image);
gl.generateMipmap(gl.TEXTURE_2D);
requestAnimationFrame(render);
});
// -- Initialize render variables
var orientation = [0.0, 0.0, 0.0];
var modelMatrix = mat4.create();
var mvMatrix = mat4.create();
var translate = vec3.create();
vec3.set(translate, 0, 0, -10);
mat4.translate(mvMatrix, modelMatrix, translate);
var perspectiveMatrix = mat4.create();
mat4.perspective(perspectiveMatrix, 0.785, 1, 1, 1000);
// -- Mouse Behaviour
var mouseDown = false;
var lastMouseX = 0;
var lastMouseY = 0;
canvas.onmousedown = function(event) {
mouseDown = true;
lastMouseX = event.clientX;
lastMouseY = event.clientY;
};
canvas.onmouseup = function(event) {
mouseDown = false;
};
canvas.onmousemove = function(event) {
var newX = event.clientX;
var newY = event.clientY;
var deltaX = newX - lastMouseX;
var deltaY = newY - lastMouseY;
var m = mat4.create();
mat4.rotateX(m, m, deltaX / 100.0);
mat4.rotateY(m, m, deltaY / 100.0);
var scale = vec3.create();
vec3.set(scale, (1 + deltaX / 1000.0), (1 + deltaX / 1000.0), (1 + deltaX / 1000.0));
mat4.scale(m, m, scale);
mat4.multiply(mvMatrix, mvMatrix, m);
lastMouseX = newX;
lastMouseY = newY;
};
function render() {
// -- Render
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.enable(gl.DEPTH_TEST);
gl.enable(gl.CULL_FACE);
gl.cullFace(gl.BACK);
orientation[0] = 0.00020; // yaw
orientation[1] = 0.00010; // pitch
orientation[2] = 0.00005; // roll
mat4.rotateX(mvMatrix, mvMatrix, orientation[0] * Math.PI);
mat4.rotateY(mvMatrix, mvMatrix, orientation[1] * Math.PI);
mat4.rotateZ(mvMatrix, mvMatrix, orientation[2] * Math.PI);
gl.bindVertexArray(vertexArray);
gl.useProgram(program);
gl.uniformMatrix4fv(mvMatrixLocation, false, mvMatrix);
gl.uniformMatrix4fv(pMatrixLocation, false, perspectiveMatrix);
gl.uniform1i(diffuseLocation, 0);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.drawElementsInstanced(gl.TRIANGLES, 36, gl.UNSIGNED_SHORT, 0, 1);
requestAnimationFrame(render);
}
// If you have a long-running page, and need to delete WebGL resources, use:
//
// gl.deleteBuffer(vertexPosBuffer);
// gl.deleteBuffer(vertexTexBuffer);
// gl.deleteBuffer(indexBuffer);
// gl.deleteTexture(texture);
// gl.deleteProgram(program);
// gl.deleteVertexArray(vertexArray);
})();
</script>
<div id="highlightedLines" style="display: none">#L63</div>
</body>
</html>