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<title>WebGL GLES2 difference test.</title>
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<script src="resources/webgl-test.js"></script>
<script src="resources/webgl-test-utils.js"></script>
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<script>
if (window.internals)
    window.internals.settings.setWebGLErrorsToConsoleEnabled(false);

var wtu = WebGLTestUtils;
description("Tests the a few differences between WebGL and GLES2");

var gl = wtu.create3DContext();
var program = wtu.loadStandardProgram(gl);
gl.useProgram(program);
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.enableVertexAttribArray(0);
glErrorShouldBe(gl, gl.NO_ERROR, "Setup should succeed");

debug("");
debug("Verify that constant color and constant alpha cannot be used together as source and destination factors in the blend function");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.CONSTANT_COLOR, gl.CONSTANT_ALPHA)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.ONE_MINUS_CONSTANT_COLOR, gl.CONSTANT_ALPHA)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.CONSTANT_COLOR, gl.ONE_MINUS_CONSTANT_ALPHA)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.ONE_MINUS_CONSTANT_COLOR, gl.ONE_MINUS_CONSTANT_ALPHA)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.CONSTANT_ALPHA, gl.CONSTANT_COLOR)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.CONSTANT_ALPHA, gl.ONE_MINUS_CONSTANT_COLOR)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.ONE_MINUS_CONSTANT_ALPHA, gl.CONSTANT_COLOR)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFunc(gl.ONE_MINUS_CONSTANT_ALPHA, gl.ONE_MINUS_CONSTANT_COLOR)");

shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.CONSTANT_COLOR, gl.CONSTANT_ALPHA, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.ONE_MINUS_CONSTANT_COLOR, gl.CONSTANT_ALPHA, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.CONSTANT_COLOR, gl.ONE_MINUS_CONSTANT_ALPHA, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.ONE_MINUS_CONSTANT_COLOR, gl.ONE_MINUS_CONSTANT_ALPHA, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.CONSTANT_ALPHA, gl.CONSTANT_COLOR, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.CONSTANT_ALPHA, gl.ONE_MINUS_CONSTANT_COLOR, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.ONE_MINUS_CONSTANT_ALPHA, gl.CONSTANT_COLOR, gl.ONE, gl.ZERO)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.blendFuncSeparate(gl.ONE_MINUS_CONSTANT_ALPHA, gl.ONE_MINUS_CONSTANT_COLOR, gl.ONE, gl.ZERO)");

debug("");
debug("Verify that in depthRange zNear <= zFar");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.depthRange(20, 10)");

debug("");
debug("Verify that front/back settings should be the same for stenclMask and stencilFunc");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilMask(255)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.drawArrays(gl.TRIANGLES, 0, 0)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilMaskSeparate(gl.FRONT, 1)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.drawArrays(gl.TRIANGLES, 0, 0)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilMaskSeparate(gl.BACK, 1)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.drawArrays(gl.TRIANGLES, 0, 0)");

shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilFunc(gl.ALWAYS, 0, 255)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.drawArrays(gl.TRIANGLES, 0, 0)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilFuncSeparate(gl.BACK, gl.ALWAYS, 1, 255)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.drawArrays(gl.TRIANGLES, 0, 0)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilFuncSeparate(gl.FRONT, gl.ALWAYS, 1, 255)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.drawArrays(gl.TRIANGLES, 0, 0)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilFuncSeparate(gl.BACK, gl.ALWAYS, 1, 1)");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.drawArrays(gl.TRIANGLES, 0, 0)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.stencilFuncSeparate(gl.FRONT, gl.ALWAYS, 1, 1)");
shouldGenerateGLError(gl, gl.NO_ERROR, "gl.drawArrays(gl.TRIANGLES, 0, 0)");

debug("");
debug("Verify that *LENGTH are undefined");
shouldBeUndefined(gl.INFO_LOG_LENGTH);
shouldBeUndefined(gl.SHADER_SOURCE_LENGTH);
shouldBeUndefined(gl.ACTIVE_UNIFORM_MAX_LENGTH);
shouldBeUndefined(gl.ACTIVE_ATTRIB_MAX_LENGTH);

debug("");
debug("Verify that UNPACK_COLORSPACE_CONVERSION_WEBGL is supported");
shouldBe("gl.getParameter(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL)", "gl.BROWSER_DEFAULT_WEBGL");
gl.pixelStorei(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, gl.NONE);
shouldBe("gl.getParameter(gl.UNPACK_COLORSPACE_CONVERSION_WEBGL)", "gl.NONE");
glErrorShouldBe(gl, gl.NO_ERROR, "set/get UNPACK_COLORSPACE_CONVERSION_WEBGL should generate no error");

debug("");
debug("Verify that drawingBufferWidth and drawingBufferHeights are implemented");
shouldBeTrue("gl.drawingBufferWidth >= 0 && gl.drawingBufferHeight >= 0");

debug("");
debug("Verify that bindAttribLocation rejects names start with webgl_ or _webgl_");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.bindAttribLocation(program, 0, 'webgl_a')");
shouldGenerateGLError(gl, gl.INVALID_OPERATION, "gl.bindAttribLocation(program, 0, '_webgl_a')");
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