Webgl's getAttribLocation oddly returns -1 - Stack Overflow

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Learnmore Webgl'sgetAttribLocationoddlyreturns-1 AskQuestion Asked 10years,5monthsago Modified 10years,5monthsago Viewed 5ktimes 16 4 Ihavemanagedtoisolatetheprobleminthiscode: vargl; _main_web=function(){ gl=document.getElementById("canvas").getContext("experimental-webgl"); gl=WebGLDebugUtils.makeDebugContext(gl, function(err,funcName,args){ throw(WebGLDebugUtils.glEnumToString(err)+"wascausedbycallto"+funcName); } ); vert_shader=gl.createShader(gl.VERTEX_SHADER); gl.shaderSource(vert_shader,"attributevec4vertex;attributevec2uv;voidmain(void){gl_Position=vertex;}\n"); gl.compileShader(vert_shader); if(!gl.getShaderParameter(vert_shader,gl.COMPILE_STATUS)){ throw0; } frag_shader=gl.createShader(gl.FRAGMENT_SHADER); gl.shaderSource(frag_shader,"voidmain(void){gl_FragColor=vec4(1.0,1.0,1.0,1.0);}\n"); gl.compileShader(frag_shader); if(!gl.getShaderParameter(frag_shader,gl.COMPILE_STATUS)){ throw1; } program=gl.createProgram(); gl.attachShader(program,vert_shader); gl.attachShader(program,frag_shader); gl.linkProgram(program); if(!gl.getProgramParameter(program,gl.LINK_STATUS)){ throw2; } vertexLocation=gl.getAttribLocation(program,"vertex"); textureLocation=gl.getAttribLocation(program,"uv"); } vertexLocationisalright,itis0.ButtextureLocationis-1,whatamImissing? webgl Share Follow askedJan25,2012at18:39 AndréPuelAndréPuel 8,28388goldbadges4848silverbadges8282bronzebadges Addacomment  |  1Answer 1 Sortedby: Resettodefault Highestscore(default) Trending(recentvotescountmore) Datemodified(newestfirst) Datecreated(oldestfirst) 48 You'retryingtogetthelocationforanattributethatyoudeclarebutneveruse.Yourvertexshadercodeis(expandedforclarity): attributevec4vertex; attributevec2uv; voidmain(void){ gl_Position=vertex; } Duringthecompilationofyourshader"uv"willbeidentifiedasanunusedparameterandbestrippedout.Evenifyouassignittoavaryinginthisshaderbutdon'teveruseitinthefragmentshader,itmaystillbestrippedoutbecauseit'sbeenidentifiedasnotcontributingtothefinalfragment. Share Follow answeredJan25,2012at21:19 TojiToji 33.1k2121goldbadges103103silverbadges114114bronzebadges 1 1 Thispointhere:"Evenifyouassignittoavaryinginthisshaderbutdon'teveruseitinthefragmentshader,itmaystillbestrippedout"iswhathelpedmeintheend.Iknewthatunusedattributeswouldbestrippedaway,butIdidn'tknowthatitcouldcarryoverbetweenthevertexandfragmentshaders.Thanks! – aclave1 Nov17,2015at17:37 Addacomment  |  YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. 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