index-validation-large-buffer.html

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"use strict";

description('Tests that index validation for drawElements works with large attribute buffers');

var wtu = WebGLTestUtils;

var context = wtu.create3DContext();

var program = wtu.loadStandardProgram(context);

context.useProgram(program);

// Create a small index buffer.

var indexObject = context.createBuffer();

context.bindBuffer(context.ELEMENT_ARRAY_BUFFER, indexObject);

var indexArray = new Uint16Array([0, 1, 2]);

context.bufferData(context.ELEMENT_ARRAY_BUFFER, indexArray, context.STATIC_DRAW);

// Create a large attribute buffer.

var vertexObject = context.createBuffer();

context.enableVertexAttribArray(0);

context.bindBuffer(context.ARRAY_BUFFER, vertexObject);

context.bufferData(context.ARRAY_BUFFER, new Float32Array(3 * 65536), context.STATIC_DRAW);

context.vertexAttribPointer(0, 3, context.FLOAT, false, 0, 0);

debug("Test large attribute buffer")

wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 0)");

// Enlarge the attribute buffer slightly.

debug("Test even larger attribute buffer")

context.bufferData(context.ARRAY_BUFFER, new Float32Array(3 * 65536 + 3), context.STATIC_DRAW);

wtu.shouldGenerateGLError(context, context.NO_ERROR, "context.drawElements(context.TRIANGLES, 3, context.UNSIGNED_SHORT, 0)");

debug("")

var successfullyParsed = true;

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