/*
* Copyright (c) 2009-2012 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.shader;
public class ShaderUtils {
public static String convertToGLSL130(String input, boolean isFrag) {
StringBuilder sb = new StringBuilder();
sb.append("#version 130\n");
if (isFrag) {
input = input.replaceAll("varying", "in");
} else {
input = input.replaceAll("attribute", "in");
input = input.replaceAll("varying", "out");
}
sb.append(input);
return sb.toString();
}
/**
* Check if a mapping is valid by checking the types and swizzle of both of
* the variables
*
* @param mapping the mapping
* @return true if this mapping is valid
*/
public static boolean typesMatch(VariableMapping mapping) {
String leftType = mapping.getLeftVariable().getType();
String rightType = mapping.getRightVariable().getType();
String leftSwizzling = mapping.getLeftSwizzling();
String rightSwizzling = mapping.getRightSwizzling();
//types match : no error
if (leftType.equals(rightType) && leftSwizzling.length() == rightSwizzling.length()) {
return true;
}
if (isSwizzlable(leftType) && isSwizzlable(rightType)) {
if (getCardinality(leftType, leftSwizzling) == getCardinality(rightType, rightSwizzling)) {
return true;
}
}
return false;
}
/**
* Check if a mapping is valid by checking the multiplicity of both of
* the variables if they are arrays
*
* @param mapping the mapping
* @return true if this mapping is valid
*/
public static boolean multiplicityMatch(VariableMapping mapping) {
String leftMult = mapping.getLeftVariable().getMultiplicity();
String rightMult = mapping.getRightVariable().getMultiplicity();
if(leftMult == null){
if(rightMult != null){
return false;
}
}else{
if(rightMult == null){
return false;
}else{
if(!leftMult.equalsIgnoreCase(rightMult)){
return false;
}
}
}
return true;
}
/**
* return the cardinality of a type and a swizzle example : vec4 cardinality
* is 4 float cardinality is 1 vec4.xyz cardinality is 3. sampler2D
* cardinality is 0
*
* @param type the glsl type
* @param swizzling the swizzling of a variable
* @return the cardinality
*/
public static int getCardinality(String type, String swizzling) {
int card = 0;
if (isSwizzlable(type)) {
if (type.equals("float")) {
card = 1;
if (swizzling.length() != 0) {
card = 0;
}
} else {
card = Integer.parseInt(type.replaceAll(".*vec", ""));
if (swizzling.length() > 0) {
card = swizzling.length();
}
}
}
return card;
}
/**
* returns true if a variable of the given type can have a swizzle
*
* @param type the glsl type
* @return true if a variable of the given type can have a swizzle
*/
public static boolean isSwizzlable(String type) {
return type.indexOf("vec4")>-1 || type.indexOf("vec3")>-1 || type.indexOf("vec2")>-1 || type.equals("float");
}
}