Unknown problem(updated)

OpenGL OpenGL: Basic Coding
1

The frame only draws once and if i remove the comment the glutPostRedisplay the screen is rendered white.


#include <gl\GLut.h>

int DLFloorBlock(0);
int DLCharacter(0);
int DLBackground(0);
GLfloat CharPos[3] = {3, 3, 0};
//GLfloat CharXPos();
//GLfloat CharYPos();
void DisplayList()
{
	// Floor Block

	DLFloorBlock = glGenLists(1);
	glNewList(DLFloorBlock, GL_COMPILE);
		glBegin(GL_QUADS);
			glColor3f(1, 0, 0);
			glVertex2f( 0, 2);
			glVertex2f( 0, 0);
			glVertex2f( 3, 0);
			glVertex2f( 3, 2);
		glEnd();
	glEndList();

	// Character

	DLCharacter = glGenLists(2);
	glNewList(DLCharacter, GL_COMPILE);
		glBegin(GL_QUADS);
			glColor3i(1, 0, 1);
			glVertex2f(4, 5);
			glVertex2f(0, 5);
			glVertex2f(0, 0);
			glVertex2f(4, 0);
		glEnd();
	glEndList();

	// Background

	DLBackground = glGenLists(3);
	glNewList(DLBackground, GL_COMPILE);
		glBegin(GL_QUADS);
			glColor3f(0, 1, 0);
			glVertex3f(0, 0, -1);
			glVertex3f(100, 0, -1);
			glVertex3f(100, 100, -1);
			glVertex3f(0, 100, -1);
		glEnd();
	glEndList();

}

void DrawCharacter()
{
	glPushMatrix();
		glTranslatef(3, 3, 0);
		glCallList(DLCharacter);

	glPopMatrix();
}
void DrawStage()
{
	glPushMatrix();
	// ***************************************START FLOOR***
		glTranslatef(0, 1, 0);
		glCallList(DLFloorBlock); 
		
		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);
		
		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);
	
		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock);

		glTranslatef(3,0 , 0);
		glCallList(DLFloorBlock); 
		//*********************************END FLOOR***

	glPopMatrix();		
}
void render()
{
	glClearColor(1, 1, 1, 1);
	glClearDepth(0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

	glOrtho(0, 50, 0, 50, -1, 1);

	glPushMatrix();
		glCallList(DLBackground);
		DrawStage();
		DrawCharacter();
		
	glPopMatrix();

	glutSwapBuffers();
	cout << "Frame done";
}
void Movement(int key, int x, int y)
{
	if(key = GLUT_KEY_RIGHT)
		CharPos[0] += 1;
	if(key = GLUT_KEY_LEFT)
		CharPos[0] -= 1;
	cout << "Move done";
}
void LevelOneMain()
{
	DisplayList();
	glutDisplayFunc(render);
	glutSpecialFunc(Movement);
	glutPostRedisplay();

	glutMainLoop();

}


// Create the window
void WindowInitGL(float Width, float Height, int argc, char **argv)
{
	glutInit(&argc, argv);
	glutInitWindowPosition(0, 0);
	glutInitWindowSize(Width, Height);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
	glutCreateWindow("Box Test");
}




void DrawFrame()
{
	glClearColor(1,1,1,1);
	glClearDepth(0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	glOrtho(0, 100, 0, 100, -1, 1);
	glCallList(DLFloorBlock);
	glFlush();
	glutSwapBuffers();
}



int main(int argc, char **argv)
{
	WindowInitGL(800, 600, argc, argv);
	LevelOneMain();
	

}
2

OpenGL functions are executed in program order, just like regular C/C++ functions. Therefore, if you want the glTranslate to affect the glCallList function, it needs to be called before glCallList.

3

Thank you, you’d be amazed at how many times i keep getting that wrong AND for the background, even though it’s Depth is -1 (behind everything, if something is executed before it but in front it won’t be shown and has to be executed after the background(a green square that covers the screen)