This sample code will load and display a rotating 3D model. Uses OpenGL and the GLTools library from the OpenGL SuperBible. More details on the UWSM model format used (and sample model data) available at http://3dgamedev.wordpress.com

blocks.uwsm

uwsm0_2
378
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loadTexModel-GLTools.cpp

// texModelGLTools
// 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.
// Daniel Livingstone, Oct 2010

// On Windows, the following define can remove some compiler problems,
// but remove the line if compiling for other platforms!
#define WIN32

#include <GLTools.h>	// OpenGL toolkit
#include <GLMatrixStack.h>
#include <GLFrustum.h>
#include <GLBatch.h>
#include <GLMatrixStack.h>
#include <GLGeometryTransform.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;
GLTriangleBatch		myObject;
GLMatrixStack		modelViewMatrix;
GLGeometryTransform	transformPipeline;
GLfloat angle = 0.0f;		// going to animate the object
GLuint textures[1];			// only using one texture just now

GLuint loadTexture(char *fname, GLuint *texID)
{
	// generate texture ID
	glGenTextures(1, texID);
	// texture dimensions and data buffer
	GLint width, height, components;
	GLenum format;
	GLbyte *pBytes;

	// load file - using GLTools library
    pBytes = gltReadTGABits(fname, &width, &height, &components, &format);
	if (pBytes == NULL)
	{
		cerr << "Something went wrong loading texture " << fname << endl;
	}

	// bind texture and set parameters
	glBindTexture(GL_TEXTURE_2D, *texID);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexImage2D(GL_TEXTURE_2D,0,components,width, height, 0,
		format, GL_UNSIGNED_BYTE, pBytes);
	glGenerateMipmap(GL_TEXTURE_2D);

	// texture loaded, free the temporary buffer
	free(pBytes);

	return *texID;	// return value of texure ID - redundant

}

// loadUWSM function
// This function *assumes* that the data matches the particular
// format expected, with minimal checks, and will blow-up if it does not
void loadUWSM(char* fname)
{
	ifstream::pos_type size;
	char * memblock;

	ifstream file (fname, ios::in|ios::binary|ios::ate);
	if (file.is_open())
	{
		size = file.tellg();
		memblock = new char [size];
		file.seekg (0, ios::beg);
		file.read (memblock, size);
		file.close();
		cout << "file " << fname << " loaded" << endl;
	}
	else
	{	// Creates empty triangle mesh if file fails to load
		cerr << "Unable to open file " << fname << endl;
		myObject.BeginMesh(0);
		myObject.End();
		return;
	}

	stringstream strstream(memblock); 	// Copy file into a stringstream

	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;
		myObject.BeginMesh(0);
		myObject.End();
		return;
	}

	// Read geometry
	int i, count; //count is number of floats, ie verts x 3
	strstream >> count;
	M3DVector3f *vertices = new M3DVector3f[count/3];
	for (i=0;i<count/3;i++)
		strstream >> vertices[i][0] >> vertices[i][1] >> vertices[i][2];

	// Read normals
	strstream >> count; // how many normals? normally will 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];	

	// Read texture coordinates
	strstream >> count; // how many texture coords? need not be same as vertices
	M3DVector2f *uv = new M3DVector2f[count/2];
	if (count > 0)	// model has UV coordinates
		for (i=0;i<count/2;i++)
			strstream >> uv[i][0] >> uv[i][1]; 
	
	int triangles;
	strstream >> triangles; // how many *triangles* in mesh?

	// Add data to GLTools TriangleBatch object
	// GLTriangleBatch will remove identical vertices, and free any unused memory
	myObject.BeginMesh(triangles*3); 
	int v0, v1, v2, t0, t1, t2;
	M3DVector3f triangleVerts[3], triangleNorms[3]; 
	M3DVector2f triangleTex[3];
	for (i=0;i<triangles;i++)
	{
		// vertex & texture indices for one triangle
		strstream >> v0 >> t0 >> v1 >> t1 >> v2 >> t2;
		m3dCopyVector3(triangleVerts[0],vertices[v0]);
		m3dCopyVector3(triangleVerts[1],vertices[v1]);
		m3dCopyVector3(triangleVerts[2],vertices[v2]);

		m3dCopyVector3(triangleNorms[0],normals[v0]);
		m3dCopyVector3(triangleNorms[1],normals[v1]);
		m3dCopyVector3(triangleNorms[2],normals[v2]);

		m3dCopyVector2(triangleTex[0],uv[t0]);
		m3dCopyVector2(triangleTex[1],uv[t1]);
		m3dCopyVector2(triangleTex[2],uv[t2]);
		myObject.AddTriangle(triangleVerts,triangleNorms,triangleTex);
	}
	myObject.End();

	delete [] memblock;
	delete [] vertices; 
	delete [] normals;
	delete [] uv;
}

void reshape(GLint w, GLint h)
{
	glViewport(0, 0, w, h);
	viewFrustum.SetPerspective(60.0f, float(w) / float(h), 0.5f, 500.0f);
	projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix());
}

void display(void)
{
	GLfloat vColour[] = { 1.0f, 0.0f, 0.8f, 1.0f};
	GLfloat vLightPos[] = {-4.0f, 3.0f, -3.0f};

	// clear the screen
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
	// set up the projection matrix
	projectionMatrix.LoadMatrix(viewFrustum.GetProjectionMatrix());

	modelViewMatrix.LoadIdentity();
	modelViewMatrix.Translate(0.0f,0.0f,-10.0f);
	modelViewMatrix.Rotate(-45.0f,1.0f,0.0f,0.0f);
	modelViewMatrix.Rotate(angle,0.0f,0.0f,1.0f);	
	modelViewMatrix.Scale(0.1f,0.1f,0.1f);

	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D,textures[0]);
	shaderManager.UseStockShader(GLT_SHADER_TEXTURE_POINT_LIGHT_DIFF, 
		modelViewMatrix.GetMatrix(), projectionMatrix.GetMatrix(), vLightPos, vColour, 0);

	myObject.Draw();
	angle += 1.0;

	glutPostRedisplay();
	glutSwapBuffers();
}

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

	shaderManager.InitializeStockShaders();
	loadUWSM("blocks.uwsm");
	textures[0] = loadTexture("wall.tga",&textures[0]);

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

// 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 << "Error: " << glewGetErrorString(err) << endl;
		return 1;
	}	
	glutReshapeFunc(reshape);
	glutDisplayFunc(display);
	init();
	glutPostRedisplay(); // draw the scene once	
	glutMainLoop();
	return 0;
}