OpenGL program error. need help - opengl

Question

//
// This code was created by Lionel Brits / Jeff Molofee '99
//
// If you've found this code useful, please let me know.
//
// Visit NeHe Productions at www.demonews.com/hosted/nehe
//
/**************************************************************/
// This code was ported to MacOS by Tony Parker.
// I'd also appreciate it if you could drop me a line if you found
// this code useful.
//
// Tony Parker - asp#usc.edu
//
// Have a nice day.
#include <stdio.h> // Header File For Standard Input / Output
#include <stdarg.h> // Header File For Variable Argument Routines
#include <string.h> // Header File For String Management
#include <stdlib.h>
#include <stdbool.h>
#include <OpenGL/gl.h> // Header File For The OpenGL32 Library
#include <OpenGL/glu.h> // Header File For The GLu32 Library
#include <GLUT/glut.h> // Header File For The GLUT Library
#include "math.h"
#include "model.h"
// Constants ----------------------------------------------------------------------
#define kWindowHeight 400
#define kWindowWidth 400
// Structures ----------------------------------------------------------------
typedef struct // Create A Structure
{
GLubyte *imageData; // Image Data (Up To 32 Bits)
GLuint bpp; // Image Color Depth In Bits Per Pixel.
GLuint width; // Image Width
GLuint height; // Image Height
GLuint texID; // Texture ID Used To Select A Texture
} TextureImage; // Structure Name
// Function Prototypes -------------------------------------------------------
bool LoadTGA(TextureImage *texture, char *filename);
float rad(float angle);
void readstr(FILE *f,char *string);
void SetupWorld(void);
GLvoid InitGL(GLvoid);
GLvoid DrawGLScene(GLvoid);
GLvoid ReSizeGLScene(int Width, int Height);
GLvoid Idle(GLvoid);
GLvoid LoadGLTextures(void);
GLvoid Keyboard(unsigned char key, int x, int y);
// Global Variables ----------------------------------------------------------
char *worldfile = "world.txt";
bool light; // Lighting ON/OFF
bool gBlend; // Blending ON/OFF
GLfloat xrot; // X Rotation
GLfloat yrot; // Y Rotation
GLfloat xspeed; // X Rotation Speed
GLfloat yspeed; // Y Rotation Speed
GLfloat walkbias = 0;
GLfloat walkbiasangle = 0;
GLfloat lookupdown = 0.0f;
const float piover180 = 0.0174532925f;
float heading, xpos, zpos;
GLfloat camx=0, camy=0, camz=0; // Camera Location
GLfloat therotate;
GLfloat z=0.0f; // Depth Into The Screen
GLfloat LightAmbient[] = { 0.5f, 0.5f, 0.5f, 1.0f }; // Ambient Light
GLfloat LightDiffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f }; // Diffuse Light
GLfloat LightPosition[] = { 0.0f, 0.0f, 2.0f, 1.0f }; // Light Position
GLuint filter; // Which Filter To Use
TextureImage texture[3]; // Storage for 3 textures
// Our Model Goes Here:
SECTOR sector1;
// rad -----------------------------------------------------------------------
// Converts Degrees To Radians. There Are 2 PI Radians In 360 Degrees.
float rad(float angle)
{
return angle * piover180;
}
// readstr -------------------------------------------------------------------
void readstr(FILE *f,char *string)
{
do
{
fgets(string, 255, f);
} while ((string[0] == '/') || (string[0] == '\n'));
return;
}
// SetupWorld ----------------------------------------------------------------
void SetupWorld(void)
{
float x, y, z, u, v;
int numtriangles;
FILE *filein;
char oneline[255];
filein = fopen(worldfile, "rt");
readstr(filein,oneline);
sscanf(oneline, "NUMPOLLIES %d\n", &numtriangles);
sector1.triangle = new TRIANGLE[numtriangles];
sector1.numtriangles = numtriangles;
int loop;
for ( loop = 0; loop < numtriangles; loop++)
{
int vert;
for ( vert = 0; vert < 3; vert++)
{
readstr(filein,oneline);
sscanf(oneline, "%f %f %f %f %f", &x, &y, &z, &u, &v);
sector1.triangle[loop].vertex[vert].x = x;
sector1.triangle[loop].vertex[vert].y = y;
sector1.triangle[loop].vertex[vert].z = z;
sector1.triangle[loop].vertex[vert].u = u;
sector1.triangle[loop].vertex[vert].v = v;
}
}
fclose(filein);
return;
}
#pragma mark -
// Main ----------------------------------------------------------------------
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(kWindowWidth, kWindowHeight);
glutInitWindowPosition (100, 100);
glutCreateWindow (argv[0]);
SetupWorld();
InitGL();
glutDisplayFunc(DrawGLScene);
glutReshapeFunc(ReSizeGLScene);
glutKeyboardFunc(Keyboard);
glutMainLoop();
return 0;
}
// InitGL ---------------------------------------------------------------------
GLvoid InitGL(GLvoid)
{
LoadGLTextures(); // Load The Texture ( ADD )
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping ( ADD )
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
glLoadIdentity(); // Reset The Projection Matrix
gluPerspective(45.0f, (GLfloat) kWindowWidth / (GLfloat) kWindowHeight, 0.1f, 100.0f);
// Calculate The Aspect Ratio Of The Window
glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);
glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);
glLightfv(GL_LIGHT1, GL_POSITION,LightPosition);
glEnable(GL_LIGHT1);
}
// Idle ---------------------------------------------------------------------
GLvoid Idle(GLvoid)
{
glutPostRedisplay();
}
// Keyboard -----------------------------------------------------------------
void Keyboard(unsigned char key, int x, int y)
{
#pragma unused (x, y)
switch(key)
{
case 'b': // turn blending on/off
gBlend = !gBlend;
if (!gBlend)
{
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
}
else
{
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
}
break;
case 'f':
filter+=1;
if (filter > 2)
{
filter = 0;
}
break;
case 'l':
light = !light;
if (!light)
glDisable(GL_LIGHTING);
else
glEnable(GL_LIGHTING);
break;
case 'w': // walk forward
xpos -= (float)sin(heading*piover180) * 0.05f;
zpos -= (float)cos(heading*piover180) * 0.05f;
if (walkbiasangle >= 359.0f)
walkbiasangle = 0.0f;
else
walkbiasangle+= 10;
walkbias = (float)sin(walkbiasangle * piover180)/20.0f;
//lookupdown -= 1.0f;
break;
case 'x': // walk back
xpos += (float)sin(heading*piover180) * 0.05f;
zpos += (float)cos(heading*piover180) * 0.05f;
if (walkbiasangle <= 1.0f)
walkbiasangle = 359.0f;
else
walkbiasangle-= 10;
walkbias = (float)sin(walkbiasangle * piover180)/20.0f;
//lookupdown += 1.0f;
break;
case 'd': // turn right
heading -= 1.0f;
yrot = heading;
break;
case 'a': // turn left
heading += 1.0f;
yrot = heading;
break;
case 'q':
z += 0.02f;
break;
case 'z':
z += 0.02f;
break;
default:
break;
}
glutPostRedisplay();
}
// DrawGLScene -------------------------------------------------------------
GLvoid DrawGLScene(GLvoid)
{
GLfloat x_m, y_m, z_m, u_m, v_m;
GLfloat xtrans, ztrans, ytrans;
GLfloat sceneroty;
xtrans = -xpos;
ztrans = -zpos;
ytrans = -walkbias-0.25f;
sceneroty = 360.0f- yrot;
int numtriangles;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The View
glRotatef(lookupdown,1.0f,0,0);
glRotatef(sceneroty,0,1.0f,0);
glTranslatef(xtrans, ytrans, ztrans);
glBindTexture(GL_TEXTURE_2D, texture[filter].texID);
numtriangles = sector1.numtriangles;
// Process Each Triangle
int loop_m;
for ( loop_m = 0; loop_m < numtriangles; loop_m++)
{
glBegin(GL_TRIANGLES);
glNormal3f( 0.0f, 0.0f, 1.0f);
x_m = sector1.triangle[loop_m].vertex[0].x;
y_m = sector1.triangle[loop_m].vertex[0].y;
z_m = sector1.triangle[loop_m].vertex[0].z;
u_m = sector1.triangle[loop_m].vertex[0].u;
v_m = sector1.triangle[loop_m].vertex[0].v;
glTexCoord2f(u_m,v_m); glVertex3f(x_m,y_m,z_m);
x_m = sector1.triangle[loop_m].vertex[1].x;
y_m = sector1.triangle[loop_m].vertex[1].y;
z_m = sector1.triangle[loop_m].vertex[1].z;
u_m = sector1.triangle[loop_m].vertex[1].u;
v_m = sector1.triangle[loop_m].vertex[1].v;
glTexCoord2f(u_m,v_m); glVertex3f(x_m,y_m,z_m);
x_m = sector1.triangle[loop_m].vertex[2].x;
y_m = sector1.triangle[loop_m].vertex[2].y;
z_m = sector1.triangle[loop_m].vertex[2].z;
u_m = sector1.triangle[loop_m].vertex[2].u;
v_m = sector1.triangle[loop_m].vertex[2].v;
glTexCoord2f(u_m,v_m); glVertex3f(x_m,y_m,z_m);
glEnd();
}
glutSwapBuffers();
glFlush();
}
// ReSizeGLScene ------------------------------------------------------------
GLvoid ReSizeGLScene(int Width, int Height)
{
glViewport (0, 0, (GLsizei) Width, (GLsizei) Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (GLfloat) Width / (GLfloat) Height, 0.1, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
// LoadGLTextures ------------------------------------------------------------
GLvoid LoadGLTextures(GLvoid)
{
//load texture
LoadTGA(&texture[0], "mud.tga");
LoadTGA(&texture[1], "mud.tga");
LoadTGA(&texture[2], "mud.tga");
// Create Nearest Filtered Texture
glBindTexture(GL_TEXTURE_2D, texture[0].texID);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
//glTexImage2D(GL_TEXTURE_2D, 0, 3, texture1->sizeX, texture1->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, texture1->data);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture[0].width, texture[0].height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture[0].imageData);
// Create Linear Filtered Texture
glBindTexture(GL_TEXTURE_2D, texture[1].texID);
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, texture1->sizeX, texture1->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, texture1->data);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture[1].width, texture[1].height, 0, GL_RGB, GL_UNSIGNED_BYTE, texture[1].imageData);
// Create MipMapped Texture
glBindTexture(GL_TEXTURE_2D, texture[2].texID);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, texture[2].width, texture[2].height, GL_RGB, GL_UNSIGNED_BYTE, texture[2].imageData);
}
/********************> LoadTGA() <*****/
bool LoadTGA(TextureImage *texture, char *filename) // Loads A TGA File Into Memory
{
GLubyte TGAheader[12]={0,0,2,0,0,0,0,0,0,0,0,0}; // Uncompressed TGA Header
GLubyte TGAcompare[12]; // Used To Compare TGA Header
GLubyte header[6]; // First 6 Useful Bytes From The Header
GLuint bytesPerPixel; // Holds Number Of Bytes Per Pixel Used In The TGA File
GLuint imageSize; // Used To Store The Image Size When Setting Aside Ram
GLuint temp; // Temporary Variable
GLuint type=GL_RGBA; // Set The Default GL Mode To RBGA (32 BPP)
FILE *file = fopen(filename, "rb"); // Open The TGA File
if( file==NULL || // Does File Even Exist?
fread(TGAcompare,1,sizeof(TGAcompare),file)!=sizeof(TGAcompare) || // Are There 12 Bytes To Read?
memcmp(TGAheader,TGAcompare,sizeof(TGAheader))!=0 || // Does The Header Match What We Want?
fread(header,1,sizeof(header),file)!=sizeof(header)) // If So Read Next 6 Header Bytes
{
fclose(file); // If Anything Failed, Close The File
return false; // Return False
}
texture->width = header[1] * 256 + header[0]; // Determine The TGA Width (highbyte*256+lowbyte)
texture->height = header[3] * 256 + header[2]; // Determine The TGA Height (highbyte*256+lowbyte)
if( texture->width <=0 || // Is The Width Less Than Or Equal To Zero
texture->height <=0 || // Is The Height Less Than Or Equal To Zero
(header[4]!=24 && header[4]!=32)) // Is The TGA 24 or 32 Bit?
{
fclose(file); // If Anything Failed, Close The File
return false; // Return False
}
texture->bpp = header[4]; // Grab The TGA's Bits Per Pixel (24 or 32)
bytesPerPixel = texture->bpp/8; // Divide By 8 To Get The Bytes Per Pixel
imageSize = texture->width*texture->height*bytesPerPixel; // Calculate The Memory Required For The TGA Data
texture->imageData=(GLubyte *)malloc(imageSize); // Reserve Memory To Hold The TGA Data
if( texture->imageData==NULL || // Does The Storage Memory Exist?
fread(texture->imageData, 1, imageSize, file)!=imageSize) // Does The Image Size Match The Memory Reserved?
{
if(texture->imageData!=NULL) // Was Image Data Loaded
free(texture->imageData); // If So, Release The Image Data
fclose(file); // Close The File
return false; // Return False
}
GLuint i;
for( i=0; i<imageSize; i= i + bytesPerPixel) // Loop Through The Image Data
{ // Swaps The 1st And 3rd Bytes ('R'ed and 'B'lue)
temp=texture->imageData[i]; // Temporarily Store The Value At Image Data 'i'
texture->imageData[i] = texture->imageData[i + 2]; // Set The 1st Byte To The Value Of The 3rd Byte
texture->imageData[i + 2] = temp; // Set The 3rd Byte To The Value In 'temp' (1st Byte Value)
}
fclose (file); // Close The File
if (texture[0].bpp==24) // Was The TGA 24 Bits
{
type=GL_RGB; // If So Set The 'type' To GL_RGB
}
// Build A Texture From The Data
// We're doing this in a different function in this tutorial
glGenTextures(1, &texture[0].texID); // Generate OpenGL texture IDs
/*
glBindTexture(GL_TEXTURE_2D, texture[0].texID); // Bind Our Texture
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); // Linear Filtered
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); // Linear Filtered
glTexImage2D(GL_TEXTURE_2D, 0, type, texture[0].width, texture[0].height, 0, type, GL_UNSIGNED_BYTE, texture[0].imageData);
*/
return true; // Texture Building Went Ok, Return True
}
NEED HELP.
I got this error:
/Users//Desktop/XcodeGLUT/../gora.cs.illinois.edu:display:cs418sp11:Home/Lesson
10 Folder/main.c:126:0
/Users//Desktop/XcodeGLUT/../gora.cs.illinois.edu:display:cs418sp11:Home/Lesson
10 Folder/main.c:126: error: 'new'
undeclared (first use in this
function)

Answer 1

rename the file to main.cpp, seems the file is compiled using the c-compiler and not the C++ compiler where new is a keyword for allocating on the heap (instead of malloc/calloc)