| <!DOCTYPE html> |
| <html> |
| <script id='2d-vertex-shader' type='x-shader/x-vertex'> |
| attribute vec4 a_Position; |
| void main() { gl_Position = a_Position; } |
| </script> |
| <script id='2d-fragment-shader' type='x-shader/x-fragment'> |
| void main( void ) {} |
| </script> |
| <body> |
| <canvas id="canvas1" width="20" height="20"></canvas> |
| <script> |
| if (window.testRunner) |
| testRunner.dumpAsText(); |
| |
| // Boilerplate set-up. |
| let canvas = document.getElementById('canvas1'); |
| let gl = canvas.getContext('webgl'); |
| |
| let vShader = gl.createShader(gl.VERTEX_SHADER); |
| let vShaderScript = document.getElementById('2d-vertex-shader'); |
| gl.shaderSource(vShader, vShaderScript.text); |
| gl.compileShader(vShader); |
| |
| let fShader = gl.createShader(gl.FRAGMENT_SHADER); |
| let fShaderScript = document.getElementById('2d-fragment-shader'); |
| gl.shaderSource(fShader, fShaderScript.text); |
| gl.compileShader(fShader); |
| |
| let program = gl.createProgram(); |
| gl.attachShader(program, vShader); |
| gl.attachShader(program, fShader); |
| gl.linkProgram(program); |
| gl.useProgram(program); |
| |
| gl.getExtension("OES_element_index_uint"); |
| let ext = gl.getExtension('ANGLE_instanced_arrays'); |
| |
| // Execute a draw that is valid, if strange. |
| let buffer = gl.createBuffer(); |
| gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer); |
| gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint8ClampedArray([256, 256, 256, 256]), gl.STATIC_DRAW); |
| ext.drawElementsInstancedANGLE(gl.TRIANGLES, 2, gl.UNSIGNED_SHORT, 0, gl.UNSIGNED_SHORT); |
| |
| // Execute a draw that is invalid because an element index is too large. |
| buffer = gl.createBuffer(); |
| gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer); |
| gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([65536, 137413, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536, 65536]), gl.STATIC_DRAW); |
| gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 10, new Uint8ClampedArray([256, 256, 256, 256, 256, 256])); |
| gl.drawElements(gl.TRIANGLES, 1, gl.UNSIGNED_INT, 0); |
| |
| // Now execute a similarly invalid call, that uses a smaller simulated buffer than the previous invalid call. |
| buffer = gl.createBuffer(); |
| gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer); |
| gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint8ClampedArray([256, 256, 256, 256, 256, 256]), gl.STATIC_DRAW); |
| gl.drawElements(gl.TRIANGLES, 1, gl.UNSIGNED_SHORT, 0); |
| </script> |
| </html> |
