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ZTestSuite/Test-ZSimplexNoise.cpp

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+/*
+	Test-ZSimplexNoise.cpp
+	Author: Chris Ertel
+
+	Purpose :	Unit tests for ZSimplexNoise
+
+	Changelog :
+	05/11/2012 - Removed dependency on FreeImage
+	12/08/2011 - Removed dependency on ZString (crertel)
+	15/02/2011 - Created (crertel)
+*/
+
+#include "ZUnitTest.hpp"
+#include <ZUtil/ZSimplexNoise.hpp>
+
+#include <iostream>
+
+static const char* test2DSimplexNoise();
+
+//List of unit tests
+ZUnitTest ZSimplexNoiseUnitTests[] =
+{
+	{
+		"test2DSimplexNoise",
+		test2DSimplexNoise
+	},
+};
+
+DECLARE_ZTESTBLOCK(ZSimplexNoise);
+
+static void SaveTGA(const char* filename, const char* bitmap)
+{
+	FILE* fp = fopen(filename, "wb");
+	
+	if(fp == NULL)
+		return;
+		
+	fputc(0, fp);	//Image ID length 
+	fputc(0, fp); 	//Color map type
+	fputc(2, fp);	//Image type. 2 = uncompressed true color
+	
+	char zero[5] = { 0, 0, 0, 0, 0 };
+	fwrite(zero, 5, sizeof(char), fp);	//5 bytes of zero for colormap
+	
+	fputc(0, fp); fputc(0, fp); 	//X image origin: 0x0000
+	fputc(0, fp); fputc(0, fp);		//Y image origin: 0x0000
+	fputc(0x00, fp); fputc(0x01, fp);	//X image width: 0x0100
+	fputc(0x00, fp); fputc(0x01, fp);	//Y image width: 0x0100
+	fputc(0x20, fp);				//Image bits per pixel (32)
+	fputc((8<<0) | (2<<4), fp);			//bits 0-3: alpha channel depth, bits 4-5: image origin, 2 = top-left
+	
+	
+	fwrite(bitmap, 256*256, 4, fp);
+	
+	fclose(fp);
+}
+
+/*************************************************************************/
+
+static const char* test2DSimplexNoise()
+{
+	char* bitmap = NULL;
+	ZSimplexNoise noisegen;
+	int i;
+	int j;
+	
+	bitmap = new char[256*256*4];
+
+	noisegen.reseed(0);
+	for (i = 0; i <256; i++)
+	{
+		for (j = 0; j <256; j++)
+		{
+
+			double noiseval = noisegen.noise2( ((float) 2*i)/256.0f,((float) 2*j)/256.0f);
+			
+			bitmap[ (i*4*256) + (4*j)+ 0] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 1] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 2] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 3] = -1;
+		}
+	}
+	SaveTGA("testnoise1.tga", bitmap);
+	
+
+	noisegen.reseed(1);
+	for (i = 0; i <256; i++)
+	{
+		for (j = 0; j <256; j++)
+		{
+
+			double noiseval = noisegen.noise2( ((float) 2*i)/256.0f,((float) 2*j)/256.0f);
+			
+			bitmap[ (i*4*256) + (4*j)+ 0] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 1] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 2] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 3] = -1;
+		}
+	}
+	SaveTGA("testnoise2.tga", bitmap);
+
+	noisegen.reseed(2);
+	for (i = 0; i <256; i++)
+	{
+		for (j = 0; j <256; j++)
+		{
+
+			double noiseval = noisegen.noise2( ((float) 2*i)/256.0f,((float) 2*j)/256.0f);
+			
+			bitmap[ (i*4*256) + (4*j)+ 0] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 1] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 2] = (char)( 128.0f + (128.0f * (noiseval)));
+			bitmap[ (i*4*256) + (4*j)+ 3] = -1;
+		}
+	}
+	SaveTGA("testnoise3.tga", bitmap);
+
+
+	delete[] bitmap;
+	
+	return ZTEST_SUCCESS;
+}
+
+