diff --git a/src/backend/glsl.js b/src/backend/glsl.js
index 06aac4e4..902b00d7 100644
--- a/src/backend/glsl.js
+++ b/src/backend/glsl.js
@@ -78,12 +78,27 @@
 		}
 		return tmp;
 	}
+	
+	function getProgramCacheKey(args) {
+		var key = '';
+		for (var i=0; i<args.length; i++) {
+			if (Array.isArray(args[i])) {
+				key += 'Array';
+			} else if (typeof args[i] == "number") {
+				key += 'Number';
+			} else if (args[i].texture instanceof WebGLTexture) {
+				key += 'Texture';
+			} else {
+				key += 'Unknown';
+			}
+		}
+		return key;
+	}
 
 	GPU.prototype._backendGLSL = function(kernel, opt) {
 		var gl = this.gl;
 		var canvas = this.canvas;
 		var compileToGlsl = this._compileToGlsl;
-		var programCache = this.programCache;
 		var endianness = this.endianness;
 		
 		var funcStr = kernel.toString();
@@ -93,139 +108,141 @@
 		
 		paramNames = getParamNames(funcStr);
 		
-		var program = programCache[this];
-		
-		if (program === undefined) {
-			var paramStr = '';
-			
-			for (var i=0; i<paramNames.length; i++) {
-				paramStr += 'uniform sampler2D user_' + paramNames[i] + ';\n';
-				paramStr += 'uniform vec2 user_' + paramNames[i] + 'Size;\n';
-				paramStr += 'uniform vec3 user_' + paramNames[i] + 'Dim;\n';
-			}
-			
-			funcStr = funcStr.replace(new RegExp('this.thread.x', 'g'), 'gpu_threadX');
-			funcStr = funcStr.replace(new RegExp('this.thread.y', 'g'), 'gpu_threadY');
-			funcStr = funcStr.replace(new RegExp('this.thread.z', 'g'), 'gpu_threadZ');
-			funcStr = funcStr.replace(new RegExp('this.dimensions.x', 'g'), 'gpu_dimensionsX');
-			funcStr = funcStr.replace(new RegExp('this.dimensions.y', 'g'), 'gpu_dimensionsY');
-			funcStr = funcStr.replace(new RegExp('this.dimensions.z', 'g'), 'gpu_dimensionsZ');
-			funcStr = funcStr.replace(new RegExp('Math.', 'g'), 'gpu_math_');
-			
-			var vertShaderSrc = [
-				'precision highp float;',
-				'precision highp int;',
-				'',
-				'attribute vec2 aPos;',
-				'attribute vec2 aTexCoord;',
-				'',
-				'varying vec2 vTexCoord;',
-				'',
-				'void main(void) {',
-				'   gl_Position = vec4(aPos, 0, 1);',
-				'   vTexCoord = aTexCoord;',
-				'}'
-			].join('\n');
-			
-			var fragShaderSrc = [
-				'precision highp float;',
-				'precision highp int;',
-				'',
-				'uniform vec3 uOutputDim;',
-				'uniform vec2 uTexSize;',
-				'varying vec2 vTexCoord;',
-				'',
-				'/* Begin: http://stackoverflow.com/questions/7059962/how-do-i-convert-a-vec4-rgba-value-to-a-float */',
-				'highp vec4 encode32(highp float f) {',
-				'	highp float e =5.0;',
-				'	highp float F = abs(f); ',
-				'	highp float sign = step(0.0,-f);',
-				'	highp float exponent = floor(log2(F)); ',
-				'	highp float mantissa = (exp2(- exponent) * F);',
-				'	exponent = floor(log2(F) + 127.0) + floor(log2(mantissa));',
-				'	highp vec4 rgba;',
-				'	rgba.a = 128.0 * sign + floor(exponent*exp2(-1.0));',
-				'	rgba.b = 128.0 * mod(exponent,2.0) + mod(floor(mantissa*128.0),128.0);',
-				'	rgba.g = floor(mod(floor(mantissa*exp2(23.0 -8.0)),exp2(8.0)));',
-				'	rgba.r = floor(exp2(23.0)*mod(mantissa,exp2(-15.0)));',
-				(endianness == 'LE' ? '' : 'rgba.rgba = rgba.abgr;'),
-				'	return rgba / 255.0;',
-				'}',
-				'',
-				'highp float decode32(highp vec4 rgba) {',
-				(endianness == 'LE' ? '' : 'rgba.rgba = rgba.abgr;'),
-				'	rgba *= 255.0;',
-				'	highp float sign = 1.0 - step(128.0,rgba.a)*2.0;',
-				'	highp float exponent = 2.0 * mod(rgba.a,128.0) + step(128.0,rgba.b) - 127.0; ',
-				'	highp float mantissa = mod(rgba.b,128.0)*65536.0 + rgba.g*256.0 +rgba.r + float(0x800000);',
-				'	highp float result =  sign * exp2(exponent) * (mantissa * exp2(-23.0 )); ',
-				'	return result;',
-				'}',
-				'/* End: http://stackoverflow.com/questions/7059962/how-do-i-convert-a-vec4-rgba-value-to-a-float */',
-				'',
-				'float index;',
-				'vec3 threadId;',
-				'',
-				'vec3 indexTo3D(float idx, vec3 texDim) {',
-				'	float z = floor(idx / (texDim.x * texDim.y));',
-				'	idx -= z * texDim.x * texDim.y;',
-				'	float y = floor(idx / texDim.x);',
-				'	float x = mod(idx, texDim.x);',
-				'	return vec3(x, y, z);',
-				'}',
-				'',
-				'float get(sampler2D tex, vec2 texSize, vec3 texDim, float z, float y, float x) {',
-				'	float index = (z * texDim.x * texDim.y) + (y * texDim.x) + x;',
-				'	float t = (floor(index / texSize.x) + 0.5) / texSize.y;',
-				'	float s = (mod(index, texSize.x) + 0.5) / texSize.x;',
-				'	return decode32(texture2D(tex, vec2(s, t)));',
-				'}',
-				'',
-				'float get(sampler2D tex, vec2 texSize, vec3 texDim, float y, float x) {',
-				'	return get(tex, texSize, texDim, 0.0, y, x);',
-				'}',
-				'',
-				'float get(sampler2D tex, vec2 texSize, vec3 texDim, float x) {',
-				'	return get(tex, texSize, texDim, 0.0, 0.0, x);',
-				'}',
-				'',
-				paramStr,
-				compileToGlsl(funcStr, {}),
-				'',
-				'void main(void) {',
-				'	index = floor(vTexCoord.s * float(uTexSize.x)) + floor(vTexCoord.t * float(uTexSize.y)) * uTexSize[0];',
-				'	threadId = indexTo3D(index, uOutputDim);',
-				'	gl_FragColor = kernel();',
-				'}'
-			].join('\n');
-			
-			var vertShader = gl.createShader(gl.VERTEX_SHADER);
-			var fragShader = gl.createShader(gl.FRAGMENT_SHADER);
-			
-			gl.shaderSource(vertShader, vertShaderSrc);
-			gl.shaderSource(fragShader, fragShaderSrc);
-			
-			gl.compileShader(vertShader);
-			gl.compileShader(fragShader);
-			
-			if (!gl.getShaderParameter(vertShader, gl.COMPILE_STATUS)) {
-				console.error("An error occurred compiling the shaders: " + gl.getShaderInfoLog(vertShader));
-				return null;
-			}
-			if (!gl.getShaderParameter(fragShader, gl.COMPILE_STATUS)) {
-				console.error("An error occurred compiling the shaders: " + gl.getShaderInfoLog(fragShader));
-				return null;
-			}
-			
-			program = gl.createProgram();
-			gl.attachShader(program, vertShader);
-			gl.attachShader(program, fragShader);
-			gl.linkProgram(program);
-			
-			programCache[this] = program;
-		}
+		var programCache = [];
 		
 		function ret() {
+			var program = programCache[getProgramCacheKey(arguments)];
+			
+			if (program === undefined) {
+				var paramStr = '';
+				
+				for (var i=0; i<paramNames.length; i++) {
+					paramStr += 'uniform sampler2D user_' + paramNames[i] + ';\n';
+					paramStr += 'uniform vec2 user_' + paramNames[i] + 'Size;\n';
+					paramStr += 'uniform vec3 user_' + paramNames[i] + 'Dim;\n';
+				}
+				
+				funcStr = funcStr.replace(new RegExp('this.thread.x', 'g'), 'gpu_threadX');
+				funcStr = funcStr.replace(new RegExp('this.thread.y', 'g'), 'gpu_threadY');
+				funcStr = funcStr.replace(new RegExp('this.thread.z', 'g'), 'gpu_threadZ');
+				funcStr = funcStr.replace(new RegExp('this.dimensions.x', 'g'), 'gpu_dimensionsX');
+				funcStr = funcStr.replace(new RegExp('this.dimensions.y', 'g'), 'gpu_dimensionsY');
+				funcStr = funcStr.replace(new RegExp('this.dimensions.z', 'g'), 'gpu_dimensionsZ');
+				funcStr = funcStr.replace(new RegExp('Math.', 'g'), 'gpu_math_');
+				
+				var vertShaderSrc = [
+					'precision highp float;',
+					'precision highp int;',
+					'',
+					'attribute vec2 aPos;',
+					'attribute vec2 aTexCoord;',
+					'',
+					'varying vec2 vTexCoord;',
+					'',
+					'void main(void) {',
+					'   gl_Position = vec4(aPos, 0, 1);',
+					'   vTexCoord = aTexCoord;',
+					'}'
+				].join('\n');
+				
+				var fragShaderSrc = [
+					'precision highp float;',
+					'precision highp int;',
+					'',
+					'uniform vec3 uOutputDim;',
+					'uniform vec2 uTexSize;',
+					'varying vec2 vTexCoord;',
+					'',
+					'/* Begin: http://stackoverflow.com/questions/7059962/how-do-i-convert-a-vec4-rgba-value-to-a-float */',
+					'highp vec4 encode32(highp float f) {',
+					'	highp float e =5.0;',
+					'	highp float F = abs(f); ',
+					'	highp float sign = step(0.0,-f);',
+					'	highp float exponent = floor(log2(F)); ',
+					'	highp float mantissa = (exp2(- exponent) * F);',
+					'	exponent = floor(log2(F) + 127.0) + floor(log2(mantissa));',
+					'	highp vec4 rgba;',
+					'	rgba.a = 128.0 * sign + floor(exponent*exp2(-1.0));',
+					'	rgba.b = 128.0 * mod(exponent,2.0) + mod(floor(mantissa*128.0),128.0);',
+					'	rgba.g = floor(mod(floor(mantissa*exp2(23.0 -8.0)),exp2(8.0)));',
+					'	rgba.r = floor(exp2(23.0)*mod(mantissa,exp2(-15.0)));',
+					(endianness == 'LE' ? '' : 'rgba.rgba = rgba.abgr;'),
+					'	return rgba / 255.0;',
+					'}',
+					'',
+					'highp float decode32(highp vec4 rgba) {',
+					(endianness == 'LE' ? '' : 'rgba.rgba = rgba.abgr;'),
+					'	rgba *= 255.0;',
+					'	highp float sign = 1.0 - step(128.0,rgba.a)*2.0;',
+					'	highp float exponent = 2.0 * mod(rgba.a,128.0) + step(128.0,rgba.b) - 127.0; ',
+					'	highp float mantissa = mod(rgba.b,128.0)*65536.0 + rgba.g*256.0 +rgba.r + float(0x800000);',
+					'	highp float result =  sign * exp2(exponent) * (mantissa * exp2(-23.0 )); ',
+					'	return result;',
+					'}',
+					'/* End: http://stackoverflow.com/questions/7059962/how-do-i-convert-a-vec4-rgba-value-to-a-float */',
+					'',
+					'float index;',
+					'vec3 threadId;',
+					'',
+					'vec3 indexTo3D(float idx, vec3 texDim) {',
+					'	float z = floor(idx / (texDim.x * texDim.y));',
+					'	idx -= z * texDim.x * texDim.y;',
+					'	float y = floor(idx / texDim.x);',
+					'	float x = mod(idx, texDim.x);',
+					'	return vec3(x, y, z);',
+					'}',
+					'',
+					'float get(sampler2D tex, vec2 texSize, vec3 texDim, float z, float y, float x) {',
+					'	float index = (z * texDim.x * texDim.y) + (y * texDim.x) + x;',
+					'	float t = (floor(index / texSize.x) + 0.5) / texSize.y;',
+					'	float s = (mod(index, texSize.x) + 0.5) / texSize.x;',
+					'	return decode32(texture2D(tex, vec2(s, t)));',
+					'}',
+					'',
+					'float get(sampler2D tex, vec2 texSize, vec3 texDim, float y, float x) {',
+					'	return get(tex, texSize, texDim, 0.0, y, x);',
+					'}',
+					'',
+					'float get(sampler2D tex, vec2 texSize, vec3 texDim, float x) {',
+					'	return get(tex, texSize, texDim, 0.0, 0.0, x);',
+					'}',
+					'',
+					paramStr,
+					compileToGlsl(funcStr, {}),
+					'',
+					'void main(void) {',
+					'	index = floor(vTexCoord.s * float(uTexSize.x)) + floor(vTexCoord.t * float(uTexSize.y)) * uTexSize[0];',
+					'	threadId = indexTo3D(index, uOutputDim);',
+					'	gl_FragColor = kernel();',
+					'}'
+				].join('\n');
+				
+				var vertShader = gl.createShader(gl.VERTEX_SHADER);
+				var fragShader = gl.createShader(gl.FRAGMENT_SHADER);
+				
+				gl.shaderSource(vertShader, vertShaderSrc);
+				gl.shaderSource(fragShader, fragShaderSrc);
+				
+				gl.compileShader(vertShader);
+				gl.compileShader(fragShader);
+				
+				if (!gl.getShaderParameter(vertShader, gl.COMPILE_STATUS)) {
+					console.error("An error occurred compiling the shaders: " + gl.getShaderInfoLog(vertShader));
+					return null;
+				}
+				if (!gl.getShaderParameter(fragShader, gl.COMPILE_STATUS)) {
+					console.error("An error occurred compiling the shaders: " + gl.getShaderInfoLog(fragShader));
+					return null;
+				}
+				
+				program = gl.createProgram();
+				gl.attachShader(program, vertShader);
+				gl.attachShader(program, fragShader);
+				gl.linkProgram(program);
+				
+				programCache[getProgramCacheKey(arguments)] = program;
+			}
+			
 			gl.useProgram(program);
 			
 			var texSize = dimToTexSize(gl, opt.dimensions);
@@ -292,13 +309,17 @@
 					}
 					var argBuffer = new Uint8Array((new Float32Array(paramArray)).buffer);
 					gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, paramSize[0], paramSize[1], 0, gl.RGBA, gl.UNSIGNED_BYTE, argBuffer);
-				} else {
+				} else if (typeof arguments[textureCount] == "number") {
+					
+				} else if (arguments[textureCount].texture instanceof WebGLTexture) {
 					paramDim = arguments[textureCount].dimensions;
 					paramSize = arguments[textureCount].size;
 					texture = arguments[textureCount].texture;
 					
 					gl.activeTexture(gl["TEXTURE"+textureCount]);
 					gl.bindTexture(gl.TEXTURE_2D, texture);
+				} else {
+					throw "Input type not supported";
 				}
 				
 				textures.push(texture);