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support baseInstance/baseVertex draw and multidraw calls
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| <!DOCTYPE html> | ||
| <html> | ||
| <head> | ||
| <title>PicoGL.js: Multi-draw</title> | ||
| <meta charset="utf-8"> | ||
| <script src="utils/compatibility.js"></script> | ||
| <script src="utils/utils.js"></script> | ||
| <link rel="stylesheet" href="../site/css/picogl-example.css"> | ||
| </head> | ||
| <!-- | ||
| The MIT License (MIT) | ||
| Copyright (c) 2017 Tarek Sherif | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
| this software and associated documentation files (the "Software"), to deal in | ||
| the Software without restriction, including without limitation the rights to | ||
| use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | ||
| the Software, and to permit persons to whom the Software is furnished to do so, | ||
| subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | ||
| FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR | ||
| COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | ||
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| --> | ||
| <body> | ||
| <div id="example-title"> | ||
| PicoGL.js Example: Multi-draw with base instance offsets | ||
| <div> | ||
| <a href="https://github.com/tsherif/picogl.js/blob/master/examples/instanced.html">Source code</a> | ||
| </div> | ||
| </div> | ||
| <canvas id="gl-canvas"></canvas> | ||
| <script type="shader/vs" id="vs"> | ||
| #version 300 es | ||
| #extension GL_ANGLE_multi_draw : require | ||
|
|
||
| layout(location=0) in vec4 position; | ||
| layout(location=1) in float verticalOffset; | ||
| layout(location=2) in vec4 color; | ||
|
|
||
| out vec4 vColor; | ||
| void main() { | ||
| vColor = color; | ||
| gl_Position = position; | ||
| gl_Position.xy += vec2(-0.6 + 0.4 * float(gl_DrawID), verticalOffset); | ||
| } | ||
| </script> | ||
| <script type="shader/fs" id="fs"> | ||
| #version 300 es | ||
| precision highp float; | ||
|
|
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| in vec4 vColor; | ||
|
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| out vec4 fragColor; | ||
| void main() { | ||
| fragColor = vColor; | ||
| } | ||
| </script> | ||
|
|
||
| <script type="module"> | ||
| import { PicoGL } from "../src/picogl.js"; | ||
|
|
||
| if (!testExtension("WEBGL_multi_draw_instanced_base_vertex_base_instance") || !testExtension("WEBGL_draw_instanced_base_vertex_base_instance")) { | ||
| document.body.innerHTML = 'This example requires extension <b>WEBGL_multi_draw_instanced_base_vertex_base_instance</b> which is not supported on this system. You may need to enable <b>WebGL Draft Extensions</b> in your browser, via <b><code>chrome://flags</code></b> in Google Chrome, or <b><code>about:config</code></b> in Firefox.'; | ||
| } | ||
|
|
||
| let canvas = document.getElementById("gl-canvas"); | ||
| canvas.width = window.innerWidth; | ||
| canvas.height = window.innerHeight; | ||
|
|
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| let app = PicoGL.createApp(canvas) | ||
| .clearColor(0.0, 0.0, 0.0, 1.0); | ||
|
|
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| window.onresize = function() { | ||
| app.resize(window.innerWidth, window.innerHeight); | ||
| } | ||
|
|
||
| // PROGRAM | ||
| let vsSource = document.getElementById("vs").text; | ||
| let fsSource = document.getElementById("fs").text; | ||
|
|
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| // PER-VERTEX POSITIONS | ||
| let positions = app.createVertexBuffer(PicoGL.FLOAT, 2, new Float32Array([ | ||
| // Triangle positions | ||
| -0.15, -0.15, | ||
| 0.15, -0.15, | ||
| 0.0, 0.15, | ||
| // Square positions | ||
| -0.15, 0.15, | ||
| -0.15, -0.15, | ||
| 0.15, -0.15, | ||
| -0.15, 0.15, | ||
| 0.15, -0.15, | ||
| 0.15, 0.15 | ||
| ])); | ||
|
|
||
| // PER-INSTANCE OFFSETS AND COLORS | ||
| let verticalOffets = app.createVertexBuffer(PicoGL.FLOAT, 1, new Float32Array([ | ||
| 0.5, | ||
| 0.0, | ||
| -0.5 | ||
| ])); | ||
|
|
||
| let colors = app.createVertexBuffer(PicoGL.UNSIGNED_BYTE, 3, new Uint8Array([ | ||
| 255, 0, 0, | ||
| 0, 255, 0, | ||
| 0, 0, 255 | ||
| ])); | ||
|
|
||
| let triangleArray = app.createVertexArray() | ||
| .vertexAttributeBuffer(0, positions) | ||
| .instanceAttributeBuffer(1, verticalOffets) | ||
| .instanceAttributeBuffer(2, colors, { normalized: true }); | ||
|
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|
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| // USE PARALLEL SHADER COMPILATION IF AVAILABLE | ||
| // https://www.khronos.org/registry/webgl/extensions/KHR_parallel_shader_compile/ | ||
| app.createPrograms([vsSource, fsSource]).then(([program]) => { | ||
| let drawCall = app.createDrawCall(program, triangleArray) | ||
| .drawRanges( | ||
| [0, 3, 1, 2], | ||
| [3, 6, 2, 1], | ||
| [3, 6, 2], | ||
| [0, 3, 3], | ||
| ); | ||
|
|
||
| app.clear(); | ||
| drawCall.draw(); | ||
|
|
||
| // CLEANUP | ||
| program.delete(); | ||
| positions.delete(); | ||
| verticalOffets.delete(); | ||
| colors.delete(); | ||
| triangleArray.delete(); | ||
| }); | ||
|
|
||
|
|
||
| </script> | ||
| <a href="https://github.com/tsherif/picogl.js" id="github-ribbon"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/365986a132ccd6a44c23a9169022c0b5c890c387/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f7265645f6161303030302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_red_aa0000.png"></a> | ||
| <script src="../site/js/iframe.js"></script> | ||
| </body> | ||
| </html> |
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