| <!-- |
| |
| /* |
| ** Copyright (c) 2012 The Khronos Group Inc. |
| ** |
| ** Permission is hereby granted, free of charge, to any person obtaining a |
| ** copy of this software and/or associated documentation files (the |
| ** "Materials"), to deal in the Materials without restriction, including |
| ** without limitation the rights to use, copy, modify, merge, publish, |
| ** distribute, sublicense, and/or sell copies of the Materials, and to |
| ** permit persons to whom the Materials are 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 Materials. |
| ** |
| ** THE MATERIALS ARE 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 |
| ** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS. |
| */ |
| |
| --> |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <!-- This is a visual test that programs must have both a vertex and |
| fragment shader attached; the fixed function pipeline on the |
| desktop must remain disabled. --> |
| <script type="application/javascript"> |
| function log() { |
| var s = ""; |
| for (var i = 0; i < arguments.length; ++i) { |
| s += arguments[i] + " "; |
| } |
| document.getElementById("log").innerHTML += s + "<br>"; |
| } |
| |
| function go() { |
| var gl = document.getElementById("c").getContext("experimental-webgl"); |
| |
| gl.clearColor(0.0, 0.0, 0.0, 0.0); |
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| |
| var vs = gl.createShader(gl.VERTEX_SHADER); |
| gl.shaderSource(vs, "attribute vec4 aVertex; attribute vec4 aColor; varying vec4 vColor; void main() { vColor = aColor; gl_Position = aVertex; }"); |
| gl.compileShader(vs); |
| |
| var fs = gl.createShader(gl.FRAGMENT_SHADER); |
| gl.shaderSource(fs, "precision mediump float; varying vec4 vColor; void main() { gl_FragColor = vColor; }"); |
| gl.compileShader(fs); |
| |
| var prog = gl.createProgram(); |
| gl.attachShader(prog, vs); |
| // don't attach a fragment shader -- may use fixed pipeline on desktop if the implementation doesn't check! |
| //gl.attachShader(prog, fs); |
| |
| gl.bindAttribLocation(prog, 0, "aVertex"); |
| gl.bindAttribLocation(prog, 1, "aColor"); |
| |
| gl.linkProgram(prog); |
| |
| var vbuf = gl.createBuffer(); |
| gl.bindBuffer(gl.ARRAY_BUFFER, vbuf); |
| gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([ |
| -1.0, -1.0, 0.0, 1.0, |
| -1.0, 1.0, 0.0, 1.0, |
| 1.0, -1.0, 0.0, 1.0, |
| 1.0, 1.0, 0.0, 1.0]), gl.STATIC_DRAW); |
| gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 0, 0); |
| |
| var cbuf = gl.createBuffer(); |
| gl.bindBuffer(gl.ARRAY_BUFFER, cbuf); |
| gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array([255, 0, 0, |
| 0, 255, 0, |
| 0, 0, 255, |
| 255, 255, 0]), gl.STATIC_DRAW); |
| gl.vertexAttribPointer(1, 3, gl.UNSIGNED_BYTE, false, 0, 0); |
| |
| gl.enableVertexAttribArray(0); |
| gl.enableVertexAttribArray(1); |
| |
| gl.useProgram(prog); |
| |
| gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); |
| |
| log("glError", "0x" + gl.getError().toString(16)); |
| } |
| </script> |
| </head> |
| |
| <body onload="go()"> |
| <p>Should be green in the rectangle below:</p> |
| <canvas style="background: green;" id="c"></canvas> |
| <div id="log"></div> |
| </body> |
| </html> |
