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#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <GL/glew.h>

#include <GL/freeglut.h>

#define WINDOW_TITLE_PREFIX "Chapter 2"

int CurrentWidth = 800,

CurrentHeight = 600,

WindowHandle = 0;

unsigned FrameCount = 0;

GLuint

VertexShaderId,

FragmentShaderId,

ProgramId,

VaoId,

VboId,

ColorBufferId;

const GLchar* VertexShader =

{

"#version 400\n"\

"layout(location=0) in vec4 in_Position;\n"\

"layout(location=1) in vec4 in_Color;\n"\

"out vec4 ex_Color;\n"\

"void main(void)\n"\

"{\n"\

" gl_Position = in_Position;\n"\

" ex_Color = in_Color;\n"\

"}\n"

};

const GLchar* FragmentShader =

{

"#version 400\n"\

"in vec4 ex_Color;\n"\

"out vec4 out_Color;\n"\

"void main(void)\n"\

"{\n"\

" out_Color = ex_Color;\n"\

"}\n"

};

void Initialize(int, char*[]);

void InitWindow(int, char*[]);

void ResizeFunction(int, int);

void RenderFunction(void);

void TimerFunction(int);

void IdleFunction(void);

void Cleanup(void);

void CreateVBO(void);

void DestroyVBO(void);

void CreateShaders(void);

void DestroyShaders(void);

int main(int argc, char* argv[])

{

Initialize(argc, argv);

glutMainLoop();

exit(EXIT_SUCCESS);

}

void Initialize(int argc, char* argv[])

{

GLenum GlewInitResult;

InitWindow(argc, argv);

glewExperimental = GL_TRUE;

GlewInitResult = glewInit();

if (GLEW_OK != GlewInitResult) {

if (GLEW_OK != GlewInitResult)

fprintf(

{

stderr,

fprintf(stderr, "ERROR: %s/n", glewGetErrorString(GlewInitResult));

"ERROR: %s\n",

glewGetErrorString(GlewInitResult)

);

exit(EXIT_FAILURE);

}

fprintf(

stdout,

"INFO: OpenGL Version: %s\n",

glGetString(GL_VERSION)

);

CreateShaders();

CreateVBO();

glClearColor(1.0f, 0.0f, 0.0f, 1.0f);

glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

}

void InitWindow(int argc, char* argv[])

{

glutInit(&argc, argv);

glutInitContextVersion(4, 0);

glutInitContextFlags(GLUT_FORWARD_COMPATIBLE);

glutInitContextProfile(GLUT_CORE_PROFILE);

glutSetOption(

GLUT_ACTION_ON_WINDOW_CLOSE,

GLUT_ACTION_GLUTMAINLOOP_RETURNS

);

glutInitWindowSize(CurrentWidth, CurrentHeight);

glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);

WindowHandle = glutCreateWindow(WINDOW_TITLE_PREFIX);

if(WindowHandle < 1) {

if (WindowHandle < 1)

{

fprintf(

stderr,

"ERROR: Could not create a new rendering window.\n"

);

exit(EXIT_FAILURE);

}

glutReshapeFunc(ResizeFunction);

glutDisplayFunc(RenderFunction);

glutIdleFunc(IdleFunction);

glutTimerFunc(0, TimerFunction, 0);

glutCloseFunc(Cleanup);

}

void ResizeFunction(int Width, int Height)

{

CurrentWidth = Width;

CurrentHeight = Height;

glViewport(0, 0, CurrentWidth, CurrentHeight);

}

void RenderFunction(void)

{

++FrameCount;

glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glDrawArrays(GL_TRIANGLES, 0, 3);

glutSwapBuffers();

glutPostRedisplay();

++FrameCount;

}

void IdleFunction(void)

{

glutPostRedisplay();

}

void TimerFunction(int Value)

{

if (0 != Value) {

if (0 != Value)

char* TempString = (char*)

{

char * TempString = (char*)

malloc(512 + strlen(WINDOW_TITLE_PREFIX));

sprintf(

sprintf(TempString, "%s: %d Frames Per Second @ %d x %d", WINDOW_TITLE_PREFIX, FrameCount * 4, CurrentWidth, CurrentHeight);

TempString,

"%s: %d Frames Per Second @ %d x %d",

WINDOW_TITLE_PREFIX,

FrameCount * 4,

CurrentWidth,

CurrentHeight

);

glutSetWindowTitle(TempString);

free(TempString);

}

FrameCount = 0;

glutTimerFunc(250, TimerFunction, 1);

}

void Cleanup(void)

{

DestroyShaders();

DestroyVBO();

}

void CreateVBO(void)

{

GLfloat Vertices[] =

{

-0.8f, -0.8f, 0.0f, 1.0f,

0.0f, 0.8f, 0.0f, 1.0f,

0.8f, -0.8f, 0.0f, 1.0f

};

GLfloat Colors[] =

{

1.0f, 0.0f, 0.0f, 1.0f,

0.0f, 1.0f, 0.0f, 1.0f,

0.0f, 0.0f, 1.0f, 1.0f

};

GLenum ErrorCheckValue = glGetError();

glGenVertexArrays(1, &VaoId);

glBindVertexArray(VaoId);

glGenBuffers(1, &VboId);

glBindBuffer(GL_ARRAY_BUFFER, VboId);

glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW);

glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);

glEnableVertexAttribArray(0);

glGenBuffers(1, &ColorBufferId);

glBindBuffer(GL_ARRAY_BUFFER, ColorBufferId);

glBufferData(GL_ARRAY_BUFFER, sizeof(Colors), Colors, GL_STATIC_DRAW);

glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0, 0);

glEnableVertexAttribArray(1);

ErrorCheckValue = glGetError();

if (ErrorCheckValue != GL_NO_ERROR)

{

fprintf(

stderr,

"ERROR: Could not create a VBO: %s \n",

gluErrorString(ErrorCheckValue)

);

exit(-1);

}

void DestroyVBO(void)

{

GLenum ErrorCheckValue = glGetError();

glDisableVertexAttribArray(1);

glDisableVertexAttribArray(0);

glBindBuffer(GL_ARRAY_BUFFER, 0);

glDeleteBuffers(1, &ColorBufferId);

glDeleteBuffers(1, &VboId);

glBindVertexArray(0);

glDeleteVertexArrays(1, &VaoId);

ErrorCheckValue = glGetError();

if (ErrorCheckValue != GL_NO_ERROR)

{

fprintf(

stderr,

"ERROR: Could not destroy the VBO: %s \n",

gluErrorString(ErrorCheckValue)

);

exit(-1);

}

void CreateShaders(void)

{

GLenum ErrorCheckValue = glGetError();

VertexShaderId = glCreateShader(GL_VERTEX_SHADER);

glShaderSource(VertexShaderId, 1, &VertexShader, NULL);

glCompileShader(VertexShaderId);

FragmentShaderId = glCreateShader(GL_FRAGMENT_SHADER);

glShaderSource(FragmentShaderId, 1, &FragmentShader, NULL);

glCompileShader(FragmentShaderId);

ProgramId = glCreateProgram();

glAttachShader(ProgramId, VertexShaderId);

glAttachShader(ProgramId, FragmentShaderId);

glLinkProgram(ProgramId);

glUseProgram(ProgramId);

ErrorCheckValue = glGetError();

if (ErrorCheckValue != GL_NO_ERROR)

{

fprintf(

stderr,

"ERROR: Could not create the shaders: %s \n",

gluErrorString(ErrorCheckValue)

);

exit(-1);

}

void DestroyShaders(void)

{

GLenum ErrorCheckValue = glGetError();

glUseProgram(0);

glDetachShader(ProgramId, VertexShaderId);

glDetachShader(ProgramId, FragmentShaderId);

glDeleteShader(FragmentShaderId);

glDeleteShader(VertexShaderId);

glDeleteProgram(ProgramId);

ErrorCheckValue = glGetError();

if (ErrorCheckValue != GL_NO_ERROR)

{

fprintf(

stderr,

"ERROR: Could not destroy the shaders: %s \n",

gluErrorString(ErrorCheckValue)

);

exit(-1);

}

已保存差異

原始文本

開啟檔案

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <GL/glew.h>
#include <GL/freeglut.h>
#define WINDOW_TITLE_PREFIX "Chapter 2"

int CurrentWidth = 800,
	CurrentHeight = 600,
	WindowHandle = 0;

unsigned FrameCount = 0;

GLuint
	VertexShaderId,
	FragmentShaderId,
	ProgramId,
	VaoId,
	VboId,
	ColorBufferId;

const GLchar* VertexShader =
{
	"#version 400\n"\

"layout(location=0) in vec4 in_Position;\n"\
	"layout(location=1) in vec4 in_Color;\n"\
	"out vec4 ex_Color;\n"\

"void main(void)\n"\
	"{\n"\
	"	gl_Position = in_Position;\n"\
	"	ex_Color = in_Color;\n"\
	"}\n"
};

const GLchar* FragmentShader =
{
	"#version 400\n"\

"in vec4 ex_Color;\n"\
	"out vec4 out_Color;\n"\

"void main(void)\n"\
	"{\n"\
	"	out_Color = ex_Color;\n"\
	"}\n"
};

void Initialize(int, char*[]);
void InitWindow(int, char*[]);
void ResizeFunction(int, int);
void RenderFunction(void);
void TimerFunction(int);
void IdleFunction(void);
void Cleanup(void);
void CreateVBO(void);
void DestroyVBO(void);
void CreateShaders(void);
void DestroyShaders(void);

int main(int argc, char* argv[])
{
	Initialize(argc, argv);

glutMainLoop();
	
	exit(EXIT_SUCCESS);
}

void Initialize(int argc, char* argv[])
{
	GLenum GlewInitResult;

InitWindow(argc, argv);

glewExperimental = GL_TRUE;
	GlewInitResult = glewInit();

if (GLEW_OK != GlewInitResult) {
		fprintf(
			stderr,
			"ERROR: %s\n",
			glewGetErrorString(GlewInitResult)
		);
		exit(EXIT_FAILURE);
	}
	
	fprintf(
		stdout,
		"INFO: OpenGL Version: %s\n",
		glGetString(GL_VERSION)
	);

CreateShaders();
	CreateVBO();

glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
}

void InitWindow(int argc, char* argv[])
{
	glutInit(&argc, argv);
	
	glutInitContextVersion(4, 0);
	glutInitContextFlags(GLUT_FORWARD_COMPATIBLE);
	glutInitContextProfile(GLUT_CORE_PROFILE);

glutSetOption(
		GLUT_ACTION_ON_WINDOW_CLOSE,
		GLUT_ACTION_GLUTMAINLOOP_RETURNS
	);
	
	glutInitWindowSize(CurrentWidth, CurrentHeight);

glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);

WindowHandle = glutCreateWindow(WINDOW_TITLE_PREFIX);

if(WindowHandle < 1) {
		fprintf(
			stderr,
			"ERROR: Could not create a new rendering window.\n"
		);
		exit(EXIT_FAILURE);
	}
	
	glutReshapeFunc(ResizeFunction);
	glutDisplayFunc(RenderFunction);
	glutIdleFunc(IdleFunction);
	glutTimerFunc(0, TimerFunction, 0);
	glutCloseFunc(Cleanup);
}

void ResizeFunction(int Width, int Height)
{
	CurrentWidth = Width;
	CurrentHeight = Height;
	glViewport(0, 0, CurrentWidth, CurrentHeight);
}

void RenderFunction(void)
{
	++FrameCount;

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	glDrawArrays(GL_TRIANGLES, 0, 3);

glutSwapBuffers();
	glutPostRedisplay();
}

void IdleFunction(void)
{
	glutPostRedisplay();
}

void TimerFunction(int Value)
{
	if (0 != Value) {
		char* TempString = (char*)
			malloc(512 + strlen(WINDOW_TITLE_PREFIX));

sprintf(
			TempString,
			"%s: %d Frames Per Second @ %d x %d",
			WINDOW_TITLE_PREFIX,
			FrameCount * 4,
			CurrentWidth,
			CurrentHeight
		);

glutSetWindowTitle(TempString);
		free(TempString);
	}
	
	FrameCount = 0;
	glutTimerFunc(250, TimerFunction, 1);
}

void Cleanup(void)
{
	DestroyShaders();
	DestroyVBO();
}

void CreateVBO(void)
{
	GLfloat Vertices[] = 
	{
		-0.8f, -0.8f, 0.0f, 1.0f,
		 0.0f,  0.8f, 0.0f, 1.0f,
		 0.8f, -0.8f, 0.0f, 1.0f
	};

GLfloat Colors[] = 
	{
		1.0f, 0.0f, 0.0f, 1.0f,
		0.0f, 1.0f, 0.0f, 1.0f,
		0.0f, 0.0f, 1.0f, 1.0f
	};

GLenum ErrorCheckValue = glGetError();
	
	glGenVertexArrays(1, &VaoId);
	glBindVertexArray(VaoId);

glGenBuffers(1, &VboId);
	glBindBuffer(GL_ARRAY_BUFFER, VboId);
	glBufferData(GL_ARRAY_BUFFER, sizeof(Vertices), Vertices, GL_STATIC_DRAW);
	glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);
	glEnableVertexAttribArray(0);
	
	glGenBuffers(1, &ColorBufferId);
	glBindBuffer(GL_ARRAY_BUFFER, ColorBufferId);
	glBufferData(GL_ARRAY_BUFFER, sizeof(Colors), Colors, GL_STATIC_DRAW);
	glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0, 0);
	glEnableVertexAttribArray(1);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not create a VBO: %s \n",
			gluErrorString(ErrorCheckValue)
		);

exit(-1);
	}
}

void DestroyVBO(void)
{
	GLenum ErrorCheckValue = glGetError();

glDisableVertexAttribArray(1);
	glDisableVertexAttribArray(0);
	
	glBindBuffer(GL_ARRAY_BUFFER, 0);

glDeleteBuffers(1, &ColorBufferId);
	glDeleteBuffers(1, &VboId);

glBindVertexArray(0);
	glDeleteVertexArrays(1, &VaoId);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not destroy the VBO: %s \n",
			gluErrorString(ErrorCheckValue)
		);

exit(-1);
	}
}

void CreateShaders(void)
{
	GLenum ErrorCheckValue = glGetError();
	
	VertexShaderId = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(VertexShaderId, 1, &VertexShader, NULL);
	glCompileShader(VertexShaderId);

FragmentShaderId = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(FragmentShaderId, 1, &FragmentShader, NULL);
	glCompileShader(FragmentShaderId);

ProgramId = glCreateProgram();
		glAttachShader(ProgramId, VertexShaderId);
		glAttachShader(ProgramId, FragmentShaderId);
	glLinkProgram(ProgramId);
	glUseProgram(ProgramId);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not create the shaders: %s \n",
			gluErrorString(ErrorCheckValue)
		);

exit(-1);
	}
}

void DestroyShaders(void)
{
	GLenum ErrorCheckValue = glGetError();

glUseProgram(0);

glDetachShader(ProgramId, VertexShaderId);
	glDetachShader(ProgramId, FragmentShaderId);

glDeleteShader(FragmentShaderId);
	glDeleteShader(VertexShaderId);

glDeleteProgram(ProgramId);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not destroy the shaders: %s \n",
			gluErrorString(ErrorCheckValue)
		);

exit(-1);
	}
}

更改後文本

開啟檔案

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <GL/glew.h>
#include <GL/freeglut.h>
#define WINDOW_TITLE_PREFIX "Chapter 2"

int CurrentWidth = 800,
CurrentHeight = 600,
WindowHandle = 0;

unsigned FrameCount = 0;

GLuint
VertexShaderId,
FragmentShaderId,
ProgramId,
VaoId,
VboId,
ColorBufferId;

const GLchar* VertexShader =
{
	"#version 400\n"\

"layout(location=0) in vec4 in_Position;\n"\
	"layout(location=1) in vec4 in_Color;\n"\
	"out vec4 ex_Color;\n"\

"void main(void)\n"\
	"{\n"\
	"	gl_Position = in_Position;\n"\
	"	ex_Color = in_Color;\n"\
	"}\n"
};

const GLchar* FragmentShader = 
{
	"#version 400\n"\

"in vec4 ex_Color;\n"\
	"out vec4 out_Color;\n"\

"void main(void)\n"\
	"{\n"\
	"	out_Color = ex_Color;\n"\
	"}\n"
};

void Initialize(int, char*[]);
void InitWindow(int, char*[]);
void ResizeFunction(int, int);
void RenderFunction(void);
void TimerFunction(int);
void IdleFunction(void);

void Cleanup(void);
void CreateVBO(void);
void DestroyVBO(void);
void CreateShaders(void);
void DestroyShaders(void);

int main(int argc, char* argv[])
{
	Initialize(argc, argv);

glutMainLoop();

exit(EXIT_SUCCESS);
}

void Initialize(int argc, char* argv[])
{
	GLenum GlewInitResult;

InitWindow(argc, argv);

GlewInitResult = glewInit();

if (GLEW_OK != GlewInitResult)
	{
		fprintf(stderr, "ERROR: %s/n", glewGetErrorString(GlewInitResult));
		exit(EXIT_FAILURE);
	}

fprintf(
		stdout,
		"INFO: OpenGL Version: %s\n",
		glGetString(GL_VERSION)
		);

CreateShaders();
	CreateVBO();
	glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
}

void InitWindow(int argc, char* argv[])
{
	glutInit(&argc, argv);

glutInitContextVersion(4, 0);
	glutInitContextFlags(GLUT_FORWARD_COMPATIBLE);
	glutInitContextProfile(GLUT_CORE_PROFILE);

glutSetOption(
		GLUT_ACTION_ON_WINDOW_CLOSE,
		GLUT_ACTION_GLUTMAINLOOP_RETURNS
		);

glutInitWindowSize(CurrentWidth, CurrentHeight);

glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);

WindowHandle = glutCreateWindow(WINDOW_TITLE_PREFIX);

if (WindowHandle < 1)
	{
		fprintf(
			stderr,
			"ERROR: Could not create a new rendering window.\n"
			);
		exit(EXIT_FAILURE);
	}

glutReshapeFunc(ResizeFunction);
	glutDisplayFunc(RenderFunction);
	glutIdleFunc(IdleFunction);
	glutTimerFunc(0, TimerFunction, 0);
	glutCloseFunc(Cleanup);
}

void ResizeFunction(int Width, int Height)
{
	CurrentWidth = Width;
	CurrentHeight = Height;
	glViewport(0, 0, CurrentWidth, CurrentHeight);
}

void RenderFunction(void)
{
	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glDrawArrays(GL_TRIANGLES, 0, 3);

glutSwapBuffers();
	glutPostRedisplay();
	++FrameCount;
}

void IdleFunction(void)
{
	glutPostRedisplay();
}

void TimerFunction(int Value)
{
	if (0 != Value)
	{
		char * TempString = (char*)
			malloc(512 + strlen(WINDOW_TITLE_PREFIX));

sprintf(TempString, "%s: %d Frames Per Second @ %d x %d", WINDOW_TITLE_PREFIX, FrameCount * 4, CurrentWidth, CurrentHeight);

glutSetWindowTitle(TempString);
		free(TempString);
	}

FrameCount = 0;
	glutTimerFunc(250, TimerFunction, 1);
}

void Cleanup(void)
{
	DestroyShaders();
	DestroyVBO();
}

void CreateVBO(void)
{
	GLfloat Vertices[] =
	{
		-0.8f, -0.8f, 0.0f, 1.0f,
		 0.0f, 0.8f, 0.0f, 1.0f,
		 0.8f, -0.8f, 0.0f, 1.0f
	};

GLfloat Colors[] =
	{
		1.0f, 0.0f, 0.0f, 1.0f,
		0.0f, 1.0f, 0.0f, 1.0f,
		0.0f, 0.0f, 1.0f, 1.0f
	};

GLenum ErrorCheckValue = glGetError();

glGenVertexArrays(1, &VaoId);
	glBindVertexArray(VaoId);

glGenBuffers(1, &ColorBufferId);
	glBindBuffer(GL_ARRAY_BUFFER, ColorBufferId);
	glBufferData(GL_ARRAY_BUFFER, sizeof(Colors), Colors, GL_STATIC_DRAW);
	glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, 0, 0);
	glEnableVertexAttribArray(1);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not create a VBO: %s \n",
			gluErrorString(ErrorCheckValue)
			);

exit(-1);
	}
}

void DestroyVBO(void)
{
	GLenum ErrorCheckValue = glGetError();

glDisableVertexAttribArray(1);
	glDisableVertexAttribArray(0);

glBindBuffer(GL_ARRAY_BUFFER, 0);

glDeleteBuffers(1, &ColorBufferId);
	glDeleteBuffers(1, &VboId);

glBindVertexArray(0);
	glDeleteVertexArrays(1, &VaoId);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not destroy the VBO: %s \n",
			gluErrorString(ErrorCheckValue)
			);

exit(-1);
	}
}

void CreateShaders(void)
{
	GLenum ErrorCheckValue = glGetError();

VertexShaderId = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(VertexShaderId, 1, &VertexShader, NULL);
	glCompileShader(VertexShaderId);

FragmentShaderId = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(FragmentShaderId, 1, &FragmentShader, NULL);
	glCompileShader(FragmentShaderId);

ProgramId = glCreateProgram();
	glAttachShader(ProgramId, VertexShaderId);
	glAttachShader(ProgramId, FragmentShaderId);
	glLinkProgram(ProgramId);
	glUseProgram(ProgramId);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not create the shaders: %s \n",
			gluErrorString(ErrorCheckValue)
			);

exit(-1);
	}
}

void DestroyShaders(void)
{
	GLenum ErrorCheckValue = glGetError();

glUseProgram(0);

glDetachShader(ProgramId, VertexShaderId);
	glDetachShader(ProgramId, FragmentShaderId);

glDeleteShader(FragmentShaderId);
	glDeleteShader(VertexShaderId);

glDeleteProgram(ProgramId);

ErrorCheckValue = glGetError();
	if (ErrorCheckValue != GL_NO_ERROR)
	{
		fprintf(
			stderr,
			"ERROR: Could not destroy the shaders: %s \n",
			gluErrorString(ErrorCheckValue)
			);

exit(-1);
	}
}