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| /* |
| ** Copyright (c) 2014 The Khronos Group Inc. |
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| ** "Materials"), to deal in the Materials without restriction, including |
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| |
| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>-1 Index Rendering Test</title> |
| <link rel="stylesheet" href="../../resources/js-test-style.css"/> |
| <script src="../../resources/js-test-pre.js"></script> |
| <script src="../resources/webgl-test-utils.js"> </script> |
| </head> |
| <body> |
| <canvas id="example" width="50" height="50"> |
| </canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script id="vshader" type="x-shader/x-vertex"> |
| attribute vec4 vPosition; |
| void main() |
| { |
| gl_Position = vPosition; |
| } |
| </script> |
| |
| <script id="fshader" type="x-shader/x-fragment"> |
| void main() |
| { |
| gl_FragColor = vec4(0.0,1.0,0.0,1.0); |
| } |
| </script> |
| |
| <script> |
| "use strict"; |
| function init() |
| { |
| description(document.title); |
| |
| var wtu = WebGLTestUtils; |
| var gl = wtu.create3DContext("example"); |
| var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["vPosition"]); |
| |
| var vertexObject = gl.createBuffer(); |
| gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject); |
| var vertexData = new Float32Array(65536 * 3); |
| vertexData[0 * 3 + 0] = 0.0; |
| vertexData[0 * 3 + 1] = 0.5; |
| vertexData[0 * 3 + 2] = 0.0; |
| vertexData[1 * 3 + 0] = -0.5; |
| vertexData[1 * 3 + 1] = -0.5; |
| vertexData[1 * 3 + 2] = 0.0; |
| vertexData[65535 * 3 + 0] = 0.5; |
| vertexData[65535 * 3 + 1] = -0.5; |
| vertexData[65535 * 3 + 2] = 0.0; |
| gl.bufferData(gl.ARRAY_BUFFER, vertexData, gl.STATIC_DRAW); |
| gl.enableVertexAttribArray(0); |
| gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0); |
| |
| var indices = new Uint16Array([0, 1, -1]); |
| var indexBuffer = gl.createBuffer(); |
| gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer); |
| gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW); |
| |
| gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT); |
| gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0); |
| |
| // This should render a green triangle in the middle of the canvas. |
| // Some implementations may incorrectly interpret the -1 index as |
| // a primitive restart and not render anything. |
| |
| // Test several locations |
| // First line should be all black |
| wtu.checkCanvasRect(gl, 0, 0, 50, 1, [0, 0, 0, 0]); |
| |
| // Line 15 should be green for at least 10 red pixels starting 20 pixels in |
| wtu.checkCanvasRect(gl, 20, 15, 10, 1, [0, 255, 0, 255]); |
| |
| // Last line should be all black |
| wtu.checkCanvasRect(gl, 0, 49, 50, 1, [0, 0, 0, 0]); |
| } |
| |
| init(); |
| var successfullyParsed = true; |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| |
| </body> |
| </html> |
