Hy,
As the title suggests I wanted to draw individual pixels to the screen. I've come a long way, but this is the essential code I've got now:
Code :
int main() {
	glewExperimental=GL_TRUE; 
	glewInit();
	GLuint BUFFER;
	glGenBuffers(1,&BUFFER);
	glBindBuffer(GL_PIXEL_UNPACK_BUFFER,BUFFER);
	glBufferData(GL_PIXEL_UNPACK_BUFFER,WIDTH*HEIGHT,NULL,GL_DYNAMIC_DRAW);
	unsigned char* buffer_map = (unsigned char*) glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
	fill_buffer(buffer_map, WIDTH, HEIGHT,objects);
}
 
void fill_buffer(unsigned char* buffer, unsigned int width, unsigned int height) {
	for (unsigned int pixelX = 0; pixelX < width; ++pixelX) {
		for (unsigned int pixelY = 0; pixelY < height; ++pixelY) {
			buffer[pixelX*height+pixelY] = 255;
		}
	}
 
	glDrawPixels(width,height,GL_RED,GL_UNSIGNED_BYTE,buffer);
}

It seems to work right. The buffer is intitialised correctly, plus it is loaded with the right values (as an test I just wanted to fill my screen with red). However though, the screen stays black, instead of being red.
Anyone a suggestion why this would be?