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C/C++ Quellcode

Texture my_sub_image(const Rect rect) 
{        
	assert(rect !is null);
	/// Damit bleibt das gesamte Fenster weiß.        
	/*        
	glMatrixMode(GL_MODELVIEW_MATRIX);
	glLoadIdentity();
	*/        
	glViewport(0, 0, rect.width, rect.height);
	GLuint subId;
	glGenTextures(1, &subId);
	// Binden den Zieltextur        
	glBindTexture(GL_TEXTURE_2D, subId);
	// Parameter der Zieltextur        
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	//glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
	glTexImage2D(GL_TEXTURE_2D, 0, this._format, rect.width, rect.height, 0, this._format, GL_UNSIGNED_BYTE, null);
	// Quelltextur binden        
	this.bind();
	// Quelltextur zeichnen        
	glBegin(GL_QUADS);
	// top left            
	glTexCoord2i(0, 0);
	glVertex2f(0, 0);
	// top right            
	glTexCoord2i(1, 0);
	glVertex2f(rect.width, 0);
	// bottom right            
	glTexCoord2i(1, 1);
	glVertex2f(rect.width, rect.height);
	// bottom left            
	glTexCoord2i(0, 1);
	glVertex2f(0, rect.height);
	glEnd();
	// Zieltextur binden        
	glBindTexture(GL_TEXTURE_2D, subId);
	// kopieren        
	glCopyTexSubImage2D(            GL_TEXTURE_2D,            0,            rect.get_x(), rect.get_x(), // x, y 
                                                          0, 0,            rect.width, rect.height        );
	glViewport(0, 0, 400, 400);
	return new Texture(null, subId, this);
}

C/C++ Quellcode

glGenTextures(1, &texture[0]);					// Create The first Texture
 
		// Typical Texture Generation Using Data From The Bitmap
		glBindTexture(GL_TEXTURE_2D, texture[0]);
		glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
 
 
 
		glGenTextures(1, &texture[1]);					// Create The second Texture (SubTexture from)
		glBindTexture(GL_TEXTURE_2D, texture[1]);
		glTexImage2D(GL_TEXTURE_2D, 0, 3, 245, 95, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL /*TextureImage[0]->data*/);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
 
		// Render 2D Scene
		glEnable(GL_TEXTURE_2D);
		glDisable(GL_DEPTH_TEST);
		glShadeModel(GL_FLAT);
 
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	
		glViewport(0, 0, 256, 256);
		glMatrixMode(GL_PROJECTION);				// Select The Projection Matrix
		glLoadIdentity();							// Reset The Projection Matrix
		glOrtho(0, 256, 0, 256, 1, -1);
		glMatrixMode(GL_MODELVIEW);					// Select The Modelview Matrix
		glLoadIdentity();							// Reset The Modelview Matrix
 
		glBindTexture(GL_TEXTURE_2D, texture[0]);	// Render first Texture to Backbuffer
		glBegin(GL_QUADS);
			glColor3f(1,1,1);
			glTexCoord2f(0, 1); glVertex2f(0, 0);
			glTexCoord2f(1, 1); glVertex2f(0 + 256, 0);
			glTexCoord2f(1, 0); glVertex2f(0 + 256, 0 + 256);
			glTexCoord2f(0, 0); glVertex2f(0, 0 + 256);
		glEnd();
		glEnable(GL_DEPTH_TEST);
 
		glBindTexture(GL_TEXTURE_2D, texture[1]);	// Selekt second Texture and Copy Backbuffer
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 5, 30, 245, 95);
		//glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 0, 0, 245, 95, 0);

C/C++ Quellcode

Texture subimage(const Rect rect) 
{
	assert(rect !is null);						// Rechteck gülltig?
 
	GLuint SubTexture;
	glGenTextures(1, &SubTexture);				// Texture erstellen (1)
	glBindTexture(GL_TEXTURE_2D, SubTexture);	// Und Binden
 
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexImage2D(GL_TEXTURE_2D, 0, 3, rect.width, rect.height, 0, this._format, GL_UNSIGNED_BYTE, null);	// Texture Dimensionen festlegen (this._format == GL_RGB[A]?)
 
	// Backbuffer rendern
	glEnable(GL_TEXTURE_2D);
	glDisable(GL_DEPTH_TEST);
	glShadeModel(GL_FLAT);
 
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);	
	glViewport(0, 0, rect.width, rect.height);
	glMatrixMode(GL_PROJECTION);				
	glLoadIdentity();							
	glOrtho(0, rect.width, 0, rect.height, 1, -1);
	glMatrixMode(GL_MODELVIEW);					
	glLoadIdentity();							
 
	//glBindTexture(GL_TEXTURE_2D, this.textureid());	
	this.bind();
	glBegin(GL_QUADS);
		glColor3f(1, 1, 1);
		glTexCoord2f(0, 1); glVertex2f(0, 0 + rect.height);
		glTexCoord2f(1, 1); glVertex2f(0 + rect.width, 0 + rect.height);
		glTexCoord2f(1, 0); glVertex2f(0 + rect.width, 0 );
		glTexCoord2f(0, 0); glVertex2f(0, 0);
	glEnd();
	glFlush();
 
	// Teilrechteck auf neue Texture kopieren
	glBindTexture(GL_TEXTURE_2D, SubTexture);	 
	glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, rect.get_x(), rect.get_y(), rect.width, rect.height);
 
	return new Texture(null, SubTexture, this);
}