Sampler filter #7
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| <!DOCTYPE html> | ||
| <!-- Ported from the OpenGL Samples Pack https://github.com/g-truc/ogl-samples/blob/master/tests/gl-330-sampler-filter.cpp --> | ||
| <html lang="en"> | ||
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| <head> | ||
| <title>WebGL 2 Samples - sampler_filter</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="utility.js"></script> | ||
| </head> | ||
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| <body> | ||
| <div id="info">WebGL 2 Samples - sampler_filter</div> | ||
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| <script id="vs" type="x-shader/x-vertex"> | ||
| #version 300 es | ||
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There was a problem hiding this comment. A while back I changed the helper function so |
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| #define POSITION_LOCATION 0 | ||
| #define TEXCOORD_LOCATION 4 | ||
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| precision highp float; | ||
| precision highp int; | ||
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| uniform mat4 mvp; | ||
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| layout(location = POSITION_LOCATION) in vec2 position; | ||
| layout(location = TEXCOORD_LOCATION) in vec2 textureCoordinates; | ||
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| out vec2 st; | ||
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| void main() | ||
| { | ||
| st = textureCoordinates; | ||
| gl_Position = mvp * vec4(position, 0.0, 1.0) ; | ||
| } | ||
| </script> | ||
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| <script id="fs" type="x-shader/x-fragment"> | ||
| #version 300 es | ||
| #define FRAG_COLOR_LOCATION 0 | ||
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| precision highp float; | ||
| precision highp int; | ||
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| uniform sampler2D diffuse; | ||
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| in vec2 st; | ||
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| layout(location = FRAG_COLOR_LOCATION) out vec4 color; | ||
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| void main() | ||
| { | ||
| color = texture(diffuse, st); | ||
| } | ||
| </script> | ||
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| <script> | ||
| (function() { | ||
| 'use strict'; | ||
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| var canvas = document.createElement('canvas'); | ||
| canvas.width = Math.min(window.innerWidth, window.innerHeight); | ||
| canvas.height = canvas.width; | ||
| document.body.appendChild(canvas); | ||
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| var gl = canvas.getContext( 'webgl2', { antialias: false } ); | ||
| if (!gl) { | ||
| gl = canvas.getContext( 'experimental-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; | ||
| } | ||
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| // -- Divide viewport | ||
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| var windowSize = { | ||
| x: canvas.width, | ||
| y: canvas.height | ||
| }; | ||
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| var Corners = { | ||
| TOP_LEFT: 0, | ||
| TOP_RIGHT: 1, | ||
| BOTTOM_RIGHT: 2, | ||
| BOTTOM_LEFT: 3, | ||
| MAX: 4 | ||
| }; | ||
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| var viewport = new Array(Corners.MAX); | ||
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| viewport[Corners.TOP_LEFT] = { | ||
| x: 0, | ||
| y: 0, | ||
| z: windowSize.x / 2, | ||
| w: windowSize.y / 2 | ||
| }; | ||
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| viewport[Corners.TOP_RIGHT] = { | ||
| x: windowSize.x / 2, | ||
| y: 0, | ||
| z: windowSize.x / 2, | ||
| w: windowSize.y / 2 | ||
| }; | ||
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| viewport[Corners.BOTTOM_RIGHT] = { | ||
| x: windowSize.x / 2, | ||
| y: windowSize.y / 2, | ||
| z: windowSize.x / 2, | ||
| w: windowSize.y / 2 | ||
| }; | ||
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| viewport[Corners.BOTTOM_LEFT] = { | ||
| x: 0, | ||
| y: windowSize.y / 2, | ||
| z: windowSize.x / 2, | ||
| w: windowSize.y / 2 | ||
| }; | ||
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| // -- Initialize program | ||
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| var program = createProgram(gl, getShaderSource('vs'), getShaderSource('fs')); | ||
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| var uniformMvpLocation = gl.getUniformLocation(program,"mvp"); | ||
| var uniformDiffuseLocation = gl.getUniformLocation(program,"diffuse"); | ||
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| // -- Initialize buffer | ||
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| var positions = new Float32Array([ | ||
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There was a problem hiding this comment. I renamed this to |
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| -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); | ||
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| var texcoords = new Float32Array([ | ||
| 0.0, 1.0, | ||
| 1.0, 1.0, | ||
| 1.0, 0.0, | ||
| 1.0, 0.0, | ||
| 0.0, 0.0, | ||
| 0.0, 1.0 | ||
| ]); | ||
| 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); | ||
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| // -- Initialize vertex array | ||
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| var vertexArray = gl.createVertexArray(); | ||
| gl.bindVertexArray(vertexArray); | ||
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| var vertexPosLocation = 0; // set with GLSL layout qualifier | ||
| gl.enableVertexAttribArray(vertexPosLocation); | ||
| gl.bindBuffer(gl.ARRAY_BUFFER, vertexPosBuffer); | ||
| gl.vertexAttribPointer(vertexPosLocation, 2, gl.FLOAT, false, 0, 0); | ||
| gl.enableVertexAttribArray(vertexPosLocation); | ||
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There was a problem hiding this comment. Remove the extra calls to There was a problem hiding this comment. Good catch! Thank you. |
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| gl.bindBuffer(gl.ARRAY_BUFFER, null); | ||
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| 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.enableVertexAttribArray(vertexTexLocation); | ||
| gl.bindBuffer(gl.ARRAY_BUFFER, null); | ||
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| gl.bindVertexArray(null); | ||
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| // -- Initialize samplers | ||
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| var samplers = new Array(Corners.MAX); | ||
| for (var i = 0; i < Corners.MAX; ++i) { | ||
| samplers[i] = gl.createSampler(); | ||
| gl.samplerParameteri(samplers[i], gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE); | ||
| gl.samplerParameteri(samplers[i], gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE); | ||
| gl.samplerParameteri(samplers[i], gl.TEXTURE_WRAP_R, gl.CLAMP_TO_EDGE); | ||
| } | ||
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| // Min filter | ||
| gl.samplerParameteri(samplers[Corners.TOP_LEFT], gl.TEXTURE_MIN_FILTER, gl.NEAREST); | ||
| gl.samplerParameteri(samplers[Corners.TOP_RIGHT], gl.TEXTURE_MIN_FILTER, gl.LINEAR); | ||
| gl.samplerParameteri(samplers[Corners.BOTTOM_RIGHT], gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST); | ||
| gl.samplerParameteri(samplers[Corners.BOTTOM_LEFT], gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR); | ||
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| // Mag filter | ||
| gl.samplerParameteri(samplers[Corners.TOP_LEFT], gl.TEXTURE_MAG_FILTER, gl.NEAREST); | ||
| gl.samplerParameteri(samplers[Corners.TOP_RIGHT], gl.TEXTURE_MAG_FILTER, gl.LINEAR); | ||
| gl.samplerParameteri(samplers[Corners.BOTTOM_RIGHT], gl.TEXTURE_MAG_FILTER, gl.LINEAR); | ||
| gl.samplerParameteri(samplers[Corners.BOTTOM_LEFT], gl.TEXTURE_MAG_FILTER, gl.LINEAR); | ||
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| // -- Load texture then render | ||
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| var imageUrl = '../assets/img/Di-3d.png'; | ||
| var texture; | ||
| loadImage(imageUrl, function(image) { | ||
| texture = gl.createTexture(); | ||
| gl.bindTexture(gl.TEXTURE_2D, texture); | ||
| gl.texImage2D( | ||
| gl.TEXTURE_2D, | ||
| 0, // Level of details | ||
| gl.RGBA, // Format | ||
| gl.RGBA, | ||
| gl.UNSIGNED_BYTE, // Size of each channel | ||
| image | ||
| ); | ||
| gl.generateMipmap(gl.TEXTURE_2D); | ||
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| render(); | ||
| }); | ||
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| function render() { | ||
| // Clear color buffer | ||
| gl.clearColor(0.0, 0.0, 0.0, 1.0); | ||
| gl.clear(gl.COLOR_BUFFER_BIT); | ||
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| // Bind program | ||
| gl.useProgram(program); | ||
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| var matrix = new Float32Array([ | ||
| 1.0, 0.0, 0.0, 0.0, | ||
| 0.0, 1.0, 0.0, 0.0, | ||
| 0.0, 0.0, 1.0, 0.0, | ||
| 0.0, 0.0, 0.0, 1.0 | ||
| ]); | ||
| gl.uniformMatrix4fv(uniformMvpLocation, false, matrix); | ||
| gl.uniform1i(uniformDiffuseLocation, 0); | ||
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| gl.activeTexture(gl.TEXTURE0); | ||
| gl.bindTexture(gl.TEXTURE_2D, texture); | ||
| gl.bindVertexArray(vertexArray); | ||
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| // Bind samplers | ||
| for (var i = 0; i < Corners.MAX; ++i) { | ||
| gl.viewport(viewport[i].x, viewport[i].y, viewport[i].z, viewport[i].w); | ||
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| gl.bindSampler(0, samplers[i]); | ||
| gl.drawArraysInstanced(gl.TRIANGLES, 0, 6, 1); | ||
| } | ||
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| // Clean up | ||
| gl.deleteBuffer(vertexPosBuffer); | ||
| gl.deleteBuffer(vertexTexBuffer); | ||
| for (var j = 0; j < samplers.length; ++j) { | ||
| gl.deleteSampler(samplers[j]); | ||
| } | ||
| gl.deleteVertexArray(vertexArray); | ||
| gl.deleteTexture(texture); | ||
| gl.deleteProgram(program); | ||
| } | ||
| })(); | ||
| </script> | ||
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| </body> | ||
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| </html> | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -36,4 +36,4 @@ | |
| onload(img); | ||
| }; | ||
| }; | ||
| })(); | ||
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Always use "WebGL", not "webgl."