MD3 c++ opengl loader help

[Viglen]

Hey guys, Im looking for some help with a MD3 loader im coding with C++,
I have some basic code written, I have the header wirtten and some of the cpp file, at the moment im looking for a website to actually explain how the C++ file to be written, there is enough information about the header file but none about coding/createing the cpp file. I have seen the other post on this forum about a MD3 loader but i have luck in making that one work,

Here is my header file

Code: Select all

 #include <GL/glew.h>
#include <GL/gl.h>
#include <string>
#include <stdlib.h>
#include <iostream>
#include <fstream>
#include <vectormath/scalar/cpp/vectormath_aos.h>

#include "GameAsset.h"

using namespace std;
using namespace Vectormath::Aos;

#ifndef MD3ASSET_H_
#define MD3ASSET_H_

class Md3Asset : public GameAsset{
public:
	Md3Asset();
	Md3Asset(const string &filename);
	virtual ~Md3Asset();

	virtual void update();
private:

	void import_md3_asset(const string &filename);

	struct md3_header
	{
		int ident;
		int version;

		char name[64];

		int flags;

		int num_frames;
		int num_tags;
		int num_surfaces;
		int num_skins;

		int ofs_frames;
		int ofs_tags;
		int ofs_surfaces;
		int ofs_eof;

		struct md3_frame
		{
			Vector3 min_bounds;
			Vector3 max_bounds;
			Vector3 local_origin;
			float radius;
			char name[16];
		};

		struct md3_tag
		{
			char name[64];
			Vector3 origin;
			Vector3 axis[3];
		};

		struct md3_surface
		{
			int ident;

			char name[64];

			int flags;

			int num_frames;
			int num_shaders;
			int num_verts;
			int num_triangles;

			int ofs_triangles;
			int ofs_shaders;
			int ofs_ST;
			int ofs_xyzNormal;
			int ofs_end;

			struct md3_shader
			{
				char name[64];
				int shader_index;
			};
			struct md3_triangle
			{
				int indexes[3];
			};

			struct md3_st
			{
				float st[3];
			};

			struct md3_vertex
			{
				short coord[3];
				short normal;
			};

		};

	};
	//Not sure about this
	typedef float vec3[3];
	//Not sure about this

	md3_header::md3_surface::md3_triangle * triangles;
	md3_header::md3_surface * surfaces;

};
#endif /* MD3ASSET_H_ */

Here is my cpp file code

Code: Select all

#include "Md3Asset.h"

Md3Asset::Md3Asset(const string &filename) {

        import_md3_asset(filename);

	// make the objects to display
	if(0 == make_resources()) {
	  cout << "Can't make the required OpenGL resources for Md3Asset." << endl;
	  // TODO: exit nicely here
	}

}

Md3Asset::Md3Asset(){}

Md3Asset::~Md3Asset() {
  // TODO: clean up
}

void Md3Asset::update() {
}

void Md3Asset::import_md3_asset(const string &filename) {
	ifstream md3file;
	md3file.open(filename.c_str(), ios::in|ios::binary);

	// C stuff
	md3_header * md3header = (struct md3_header *)
			malloc(sizeof(struct md3_header));
	md3file.read((char*) md3header, sizeof(struct md3_header));
	if((md3header->ident != 860898377)||(md3header->version !=15))
		{
		cout << md3header->version << endl;
		cout << md3header->ident << endl;
			cerr<<"Bad Version or identifier"<<endl;
		}

	// Get the triange data
	this->triangles = (md3_header::md3_surface::md3_triangle*)
			calloc(this->surfaces->num_triangles, sizeof(struct md3_header::md3_surface));

	cout<<triangles<<endl;
}

If anyone has a some source code for the header a cpp file for me to have a look at and get to grips with,

Cheers

[^misantropia^]

Why don't you copy the MD3 loader from the q3map2 or ioquake3 source code?

[Viglen]

is that in C++ and also where may i find this? i dont want a C# version as i dont really understand C# cmpared to C++ could you give me a link if possible

[Eraser]

I get the impression that you aren't asking for information about how the MD3 format works, but about how one goes about writing a computer progrma in C++.

How experienced are you in the field of programming? How much experience do you have with C++? How much experience do you have with writing 3D renderers, specifically in OpenGL?

I mean, there are probably countless of examples and tutorials about writing an OpenGL renderer. Once you're familiar with that, the specifics you need to know are how to extract the triangle data from an MD3 model. Technically speaking, all you need is a specification of the MD3 file format.

Here's some documentation on that:
http://icculus.org/homepages/phaethon/q ... ormat.html

Not sure how complete or how accurate that is though.

[Viglen]

Ive done C++ for 3 years or so now, but not hardcore as im at university and im learning more then jsut C++ so i cant just sit down and keep at one thing , I havent done a renderer for openGL ever but we have been given one to use for us to make a MD3 loader, I have the header but i just cant seem to read the file correctly, every time i try i try and load it i get some random data that isnt correct, Im using a MD3 model that a MD3 C# programer used, so i know its not the model, Im just trying to create a C++ file that will load the MD3 file, extract the surfaces, triangles, tags bla bla bla, nothing else at the moment, i just want to be able to extract the correct data. thats it