An example model loader/viewer for OpenGL core profile. This code uses the GLTools library. Model details on the model format will be available at 3dgamedev.wordpress.com ...

blocks.uwsm

uwsm0_2
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LoadModel-GLTools.cpp

// loadModelDataTest-GLTools
// A simple app that loads model data from a custom data format
// the format is a (relatively) simple one based on how an individual
// mesh may be saved in a Collada file - currently the easiest way
// to make models, is with Google Sketchup, export to Collada, then
// manually hack the data and save.
//
// A version of this code which only requires GLEW and freeglut is to
// follow
// Daniel Livingstone, Oct 2010
//
// On Windows, the following define can remove some compiler problems,
// but remove the line if compiling for other platforms!
// - sometimes get problems compiling GLBatch.h otherwise :-(
#define WIN32

#include <GLTools.h>	// OpenGL toolkit
#include <GLMatrixStack.h>
#include <GLFrustum.h>
#include <GLBatch.h>
#include <GLMatrixStack.h>
#include <GLGeometryTransform.h>
#include <math3d.h>

#include <iostream>
#include <fstream>
#include <sstream>

#define FREEGLUT_STATIC
#include <GL/glut.h>

using namespace std;

// * Global Variables *
GLMatrixStack		projectionMatrix;
GLFrustum			viewFrustum;
GLShaderManager		shaderManager;
GLBatch				myObject;
GLMatrixStack		modelViewMatrix;
GLGeometryTransform	transformPipeline;
float angle = 0.0f;

// Functions
void reshape(GLint w, GLint h)
{
	glViewport(0, 0, w, h);
	viewFrustum.SetPerspective(35.0f, float(w) / float(h), 1.0f, 500.0f);
	projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix());
}

void keyboard(unsigned char key, GLint x, GLint y)
{ // could manually control the rotations using this function
}

void display(void)
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear window
	glEnable(GL_BLEND);
	glDisable(GL_CULL_FACE);
	projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix());

	GLfloat vColour[] = { 1.0f, 0.0f, 0.8f, 1.0f};
	GLfloat vLightPos[] = {0.0f, 3.0f, -3.0f};

	modelViewMatrix.PushMatrix();
	modelViewMatrix.Translate(-2.0f,-2.0f,-8.0f); // move object towards centre
	modelViewMatrix.Rotate(-90,1.0f,0.0f,0.0f);   // turn upright
	// next three transforms are to make the model rotate in place
	// (more or less) - this model has origin at one corner, instead of in middle
	modelViewMatrix.Translate(2.0f,-1.0f,0.0f);   // translate
	modelViewMatrix.Rotate(angle,0.0f,0.0f,1.0f); // ... rotate
	modelViewMatrix.Translate(-2.0f,1.0f,0.0f);   // ... inverse translate
	angle += 0.2f;

	modelViewMatrix.Scale(0.1f,0.1f,0.1f);
	shaderManager.UseStockShader(GLT_SHADER_POINT_LIGHT_DIFF, 
		modelViewMatrix.GetMatrix(), projectionMatrix.GetMatrix(), vLightPos, vColour);
	myObject.Draw();

	// could add more tranformations and draw our object again... 
	// or draw some other stuff!

	modelViewMatrix.PopMatrix();

	glutPostRedisplay();
	glutSwapBuffers();
}

// loadData function
// this function *assumes* that the data matches the particular
// format expected, and will blow-up if it does not
void loadData(GLBatch & object, char* fname)
{
	ifstream::pos_type size;
	char * memblock;
	string text;

	// file read based on example in cplusplus.com tutorial
	ifstream file (fname, ios::in|ios::binary|ios::ate);
	if (file.is_open())
	{
		size = file.tellg();
		//fSize = (GLuint) size;
		memblock = new char [size];
		file.seekg (0, ios::beg);
		file.read (memblock, size);
		file.close();
		cout << "file " << fname << " loaded" << endl;
		text.assign(memblock);
	}
	else
	{
		cout << "Unable to open file " << fname << endl;
		exit(1);
	}

	int count; //count is number of floats, ie verts x 3
	stringstream strstream;
	
	strstream << memblock;

	string magicnumber; // Basic check: is this a uwsm file?
	strstream >> magicnumber;
	if (magicnumber.compare(0,4,"uwsm")!=0)
	{ // could also use the version number, but not doing that just now
		cerr << "File " << fname << " is not a uwsm file." << endl;
		exit(1);
	}

	strstream >> count;
	M3DVector3f *vertices = new M3DVector3f[count/3];
	int i;
	for (i=0;i<count/3;i++)
		strstream >> vertices[i][0] >> vertices[i][1] >> vertices[i][2];

	strstream >> count; // how many normals? need not be same as vertices
	M3DVector3f *normals = new M3DVector3f[count/3];
	for (i=0;i<count/3;i++)
		strstream >> normals[i][0] >> normals[i][1] >> normals[i][2];
	
	strstream >> count; // how many texture coords? need not be same as vertices
	GLfloat nul;
	for (i=0;i<count;i++)
		strstream >> nul; // not using these just now!
	int triangles;
	strstream >> triangles; // how many *triangles* in mesh?
	M3DVector3f *meshVerts = new M3DVector3f[triangles*3];
	M3DVector3f *meshNormals = new M3DVector3f[triangles*3];
	int n;
	for (i=0;i<triangles*3;i++)
	{
		// commented out lines show how we *could* vary no. of normals & tex co-ords
		// from number of vertices. Useful for e.g. when a vertex is shared
		// by two faces with different textures on them
		strstream >> n; // vertex index
		m3dCopyVector3(meshVerts[i],vertices[n]);
		//strstream >> n; // normal index
		m3dCopyVector3(meshNormals[i],normals[n]);
		//strstream >> n; // texture u-v index - ignore for now
	}

	object.Begin(GL_TRIANGLES, triangles*3, 0);
	object.CopyVertexData3f(meshVerts);
	object.CopyNormalDataf(meshNormals);
	object.End();

	delete [] memblock; // I sure did allocate a lot of arrays!
	delete [] vertices; // could do more for less, I'm sure
	delete [] normals;
	delete [] meshVerts;
	delete [] meshNormals;
}


void init(void)
{
	glClearColor(1.0f, 1.0f, 1.0f, 1.0f ); // white background
	shaderManager.InitializeStockShaders();
	glEnable(GL_DEPTH_TEST);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

	transformPipeline.SetMatrixStacks(modelViewMatrix, projectionMatrix);
	modelViewMatrix.LoadIdentity();
	modelViewMatrix.Translate(0.0f,0.0f,-5.0f);

	loadData(myObject,"blocks.uwsm");
}

// Main function - program entry point
int main(int argc, char* argv[])
{
	gltSetWorkingDirectory(argv[0]);
	
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
	glutInitWindowSize(800, 600);
	glutCreateWindow("simple3Dapp");
	
	GLenum err = glewInit();
	if (GLEW_OK != err)
	{
		// Problem: glewInit failed, something is seriously wrong.
		// cerr is the standard error output stream
		cerr << "Error: " << glewGetErrorString(err) << endl;
		return 1;
	}	

	glutReshapeFunc(reshape);
	glutKeyboardFunc(keyboard);
	glutDisplayFunc(display);

	init();
	glutPostRedisplay(); // draw the scene once	

	glutMainLoop();
	return 0;
}