//?--------------------------------------------------------------------------
//?GPU?raycasting?tutorial
//?Made?by?Peter?Trier?jan?2007
//
//?This?file?contains?all?the?elements?nessesary?to?implement?a?simple?
//?GPU?volume?raycaster.
//?Notice?this?implementation?requires?a?shader?model?3.0?gfxcard
//?--------------------------------------------------------------------------

#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?
#include?“Vector3.h“

#define?MAX_KEYS?256
#define?WINDOW_SIZE?800
#define?VOLUME_TEX_SIZE?128

using?namespace?std;

//?Globals?------------------------------------------------------------------

bool?gKeys[MAX_KEYS];
bool?toggle_visuals?=?true;
CGcontext?context;?
CGprofile?vertexProfile?fragmentProfile;?
CGparameter?param1param2;
GLuint?renderbuffer;?
GLuint?framebuffer;?
CGprogram?vertex_mainfragment_main;?//?the?raycasting?shader?programs
GLuint?volume_texture;?//?the?volume?texture
GLuint?backface_buffer;?//?the?FBO?buffers
GLuint?final_image;
float?stepsize?=?1.0/50.0;

///?Implementation?----------------------------------------

void?cgErrorCallback（）
{
	CGerror?lastError?=?cgGetError（）;?
	if（lastError）
	{
		cout?<		if（context?!=?NULL）
			cout?<		exit（0）;
	}
}

//?Sets?a?uniform?texture?parameter
void?set_tex_param（char*?par?GLuint?texconst?CGprogram?&programCGparameter?param）?
{
	param?=?cgGetNamedParameter（program?par）;?
	cgGLSetTextureParameter（param?tex）;?
	cgGLEnableTextureParameter（param）;
}


//?load_vertex_program:?loading?a?vertex?program
void?load_vertex_program（CGprogram?&v_programchar?*shader_path?char?*program_name）
{
	assert（cgIsContext（context））;
	v_program?=?cgCreateProgramFromFile（context?CG_SOURCEshader_path
		vertexProfileprogram_name?NULL）;	
	if?（!cgIsProgramCompiled（v_program））
		cgCompileProgram（v_program）;

	cgGLEnableProfile（vertexProfile）;
	cgGLLoadProgram（v_program）;
	cgGLDisableProfile（vertexProfile）;
}

//?load_fragment_program:?loading?a?fragment?program
void?load_fragment_program（CGprogram?&f_programchar?*shader_path?char?*program_name）
{
	assert（cgIsContext（context））;
	f_program?=?cgCreateProgramFromFile（context?CG_SOURCE?shader_path
		fragmentProfileprogram_name?NULL）;	
	if?（!cgIsProgramCompiled（f_program））
		cgCompileProgram（f_program）;

	cgGLEnableProfile（fragmentProfile）;
	cgGLLoadProgram（f_program）;
	cgGLDisableProfile（fragmentProfile）;
}

void?enable_renderbuffers（）
{
	glBindframebufferEXT?（GL_frameBUFFER_EXT?framebuffer）;
	glBindRenderbufferEXT（GL_RENDERBUFFER_EXT?renderbuffer）;
}

void?disable_renderbuffers（）
{
	glBindframebufferEXT（GL_frameBUFFER_EXT?0）;
}

void?vertex（flo

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件?????1388544??2005-01-07?13:12??raycasting_tutorial\cg.dll
?????文件???????35830??2005-01-07?13:11??raycasting_tutorial\cg.lib
?????文件??????180224??2005-01-07?13:12??raycasting_tutorial\cgGL.dll
?????文件???????19722??2005-01-07?13:11??raycasting_tutorial\cgGL.lib
?????文件??????????77??2007-01-30?07:29??raycasting_tutorial\Desktop.ini
?????文件??????188416??2005-05-15?23:42??raycasting_tutorial\glew32.dll
?????文件??????279300??2005-05-15?23:42??raycasting_tutorial\glew32.lib
?????文件??????690534??2005-05-15?23:42??raycasting_tutorial\glew32s.lib
?????文件??????237568??2006-06-26?14:14??raycasting_tutorial\glut32.dll
?????文件???????28728??2006-10-23?14:32??raycasting_tutorial\glut32.lib
?????文件???????90112??2007-01-30?11:15??raycasting_tutorial\GPU_raycasting.exe
?????文件????????2039??2006-11-27?21:54??raycasting_tutorial\Jelly?ball.rc
?????文件???????15399??2007-01-30?11:15??raycasting_tutorial\main.cpp
?????文件????????3638??2006-11-27?21:54??raycasting_tutorial\Quad?5.ico
?????文件??????838656??2007-01-30?11:16??raycasting_tutorial\raycasting?tut.ncb
?????文件?????????901??2006-11-21?21:55??raycasting_tutorial\raycasting?tut.sln
?????文件???????13824??2007-01-30?11:16??raycasting_tutorial\raycasting?tut.suo
?????文件????????2558??2007-01-30?11:14??raycasting_tutorial\raycasting_shader.cg
?????文件????????2580??2007-01-30?09:35??raycasting_tutorial\raycasting_shader.cg~
?????目錄???????????0??2007-01-30?12:59??raycasting_tutorial\Release\
?????文件????????2365??2007-01-30?11:15??raycasting_tutorial\Release\BuildLog.htm
?????文件????????3764??2007-01-30?09:41??raycasting_tutorial\Release\Jelly?ball.res
?????文件???????91186??2007-01-30?11:15??raycasting_tutorial\Release\main.obj
?????文件??????650240??2007-01-30?11:15??raycasting_tutorial\Release\raycasting?tut.pdb
?????文件??????347136??2007-01-30?11:15??raycasting_tutorial\Release\vc70.idb
?????文件??????167936??2007-01-30?11:15??raycasting_tutorial\Release\vc70.pdb
?????文件?????????453??2006-11-27?21:54??raycasting_tutorial\resource.h
?????文件????????6144??2007-01-30?07:29??raycasting_tutorial\Thumbs.db
?????文件????????4580??2004-10-15?11:34??raycasting_tutorial\Vector3.h
?????文件????????3498??2007-01-30?08:02??raycasting_tutorial\Volley.vcproj