Added initial Smoothed Particle Hydrodynamics implementation (SPH), for CPU and CUDA.

This software is contributed under the ZLib license by Rama Hoetzlein, http://www.rchoetzlein.com
We plan to integrate the SPH into the core Bullet library, including interaction with rigid bodies and soft bodies.

Extras/sph/common/gl_helper.h

@@ -0,0 +1,89 @@
+/*
+  FLUIDS v.1 - SPH Fluid Simulator for CPU and GPU
+  Copyright (C) 2009. Rama Hoetzlein, http://www.rchoetzlein.com
+
+  ZLib license
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef GL_HELPER
+	#define GL_HELPER
+
+	#include "common_defs.h"
+
+	#include <gl/glee.h>
+	#include <gl/glext.h>	
+
+	#ifdef _MSC_VER						// Windows
+		#ifdef USE_SHADOWS
+			#include <gl/glee.h>
+			#include <gl/glext.h>	
+		#endif			
+		#include <gl/glut.h>
+	#else								// Linux
+		#ifdef USE_SHADOWS
+			#include "GLee.h"
+		#endif
+		#include <GL/glext.h>	
+		#include <GL/glut.h>	
+	#endif
+	
+	#include "image.h"
+	#include "mtime.h"
+
+	extern void checkOpenGL ();
+	extern void drawText ( int x, int y, char* msg);
+	extern void drawGrid ();
+	extern void measureFPS ();
+
+	extern mint::Time	tm_last;
+	extern int			tm_cnt;
+	extern float		tm_fps;
+	
+
+	extern void disableShadows ();
+	extern void checkFrameBuffers ();
+
+	extern GLuint glSphere;
+	extern float  glRadius;
+	extern void setSphereRadius ( float f );
+	extern void drawSphere ();
+
+	#ifdef USE_SHADOWS
+		extern void setShadowLight ( float fx, float fy, float fz, float tx, float ty, float tz, float fov );
+		extern void setShadowLightColor ( float dr, float dg, float db, float sr, float sg, float sb );
+		
+		extern void createFrameBuffer ();
+		extern void createShadowTextures ();
+		extern void computeLightMatrix ( int n, int tx, int ty );
+		extern void renderDepthMap_Clear ( float wx, float wy );
+		extern void renderDepthMap_FrameBuffer ( int n, float wx, float wy );
+		extern void renderShadowStage ( int n, float* vmat );
+		extern void renderShadows ( float* vmat );
+		extern void drawScene ( float* view_mat, bool bShaders );		// provided by user
+
+		extern float light_proj[16];
+		extern float light_x, light_y, light_z;
+		extern float light_tox, light_toy, light_toz;
+		extern float light_mfov;
+
+		extern GLuint		shadow1_id;
+		extern GLuint		shadow2_id;
+	#endif
+
+
+#endif