Linker Error using SDL+ GL

Author

255

February 19, 2005 09:35 PM

I don't know where to put this questions so I'll ask here since I'm using SDL+OpenGL to render. I could compile this app using devcpp with full optomization but I just got myself MSVc++6 and it won't compile on "release' mode. Only debug. C++

Release Build:
--------------------Configuration: torus - Win32 Release--------------------
Compiling...
torus.cpp
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(106) : warning C4305: 'argument' : truncation from 'const double' to 'float'
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(106) : warning C4305: 'argument' : truncation from 'const double' to 'float'
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(152) : warning C4101: 'znear' : unreferenced local variable
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(152) : warning C4101: 'aspect' : unreferenced local variable
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(152) : warning C4101: 'zfar' : unreferenced local variable
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(152) : warning C4101: 'FOVy' : unreferenced local variable
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(257) : warning C4244: 'initializing' : conversion from 'double' to 'float', possible loss of data
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(258) : warning C4244: 'initializing' : conversion from 'double' to 'float', possible loss of data
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(260) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(261) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
C:\Program Files\Microsoft Visual Studio\MyProjects\torus\torus.cpp(262) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
Linking...
msvcrt.lib(MSVCRT.dll) : error LNK2005: _exit already defined in LIBC.lib(crt0dat.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: _strncpy already defined in LIBC.lib(strncpy.obj)
msvcrt.lib(MSVCRT.dll) : error LNK2005: __isctype already defined in LIBC.lib(isctype.obj)
LIBC.lib(crt0init.obj) : warning LNK4098: defaultlib "msvcrt.lib" conflicts with use of other libs; use /NODEFAULTLIB:library
Release/torus.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

torus.exe - 4 error(s), 12 warning(s)






Here's the DEBUG build:

Deleting intermediate files and output files for project 'torus - Win32 Debug'.
--------------------Configuration: torus - Win32 Debug--------------------
Compiling...
torus.cpp
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(106) : warning C4305: 'argument' : truncation from 'const double' to 'float'
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(106) : warning C4305: 'argument' : truncation from 'const double' to 'float'
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(152) : warning C4101: 'znear' : unreferenced local variable
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(152) : warning C4101: 'aspect' : unreferenced local variable
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(152) : warning C4101: 'zfar' : unreferenced local variable
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(152) : warning C4101: 'FOVy' : unreferenced local variable
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(257) : warning C4244: 'initializing' : conversion from 'double' to 'float', possible loss of data
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(258) : warning C4244: 'initializing' : conversion from 'double' to 'float', possible loss of data
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(260) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(261) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
c:\program files\microsoft visual studio\myprojects\torus\torus.cpp(262) : warning C4244: '=' : conversion from 'double' to 'float', possible loss of data
Linking...

torus.exe - 0 error(s), 11 warning(s)

Here's the source: C++

/* Testing compile in VC++ 6
   Relsoft 2004
   Rel.Betterwebber.com
   Bug : can't compile in "Release" mode only "Debug"
*/
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <string.h>
#include <sdl/SDL.h>
#include <gl/gl.h>
#include <gl/glu.h>
#include <math.h>


struct vector
{
	float x;
	float y;
	float z;
};

struct point3d
{
	float  x;
	float  y;
	float  z;
	float  r;
	float  g;
	float  b;
	int color;
};

struct poly
{
	int p1;
	int p2;
	int p3;
	float u1;
	float v1;
	float u2;
	float v2;
	float u3;
	float v3;	
	int color;
	int idx;
};



#define PI = 3.141593

#define TOR_NUM_RINGS  35
#define TOR_NUM_BANDS  28
#define TOR_RING_RAD   1.20 * 1
#define TOR_BAND_RAD   0.30 * 1
#define TOR_MAX_POINTS TOR_NUM_RINGS * TOR_NUM_BANDS


#define SCR_WIDTH 640
#define SCR_HEIGHT 480
#define SCR_BPP 16

//Macros
#define rgb(r, g, b)  (r) << 16 | (g) << 8 | (b)
#define relmin(x, y) ( (x) < (y) ? (x) : (y) )


void Init_SDL_GL(int width, int height, int bpp);
void Init_GL(int width, int height);
void Render_Scene(point3d *model, poly *modeltri,
                  int max3dpoint, int tor_max_poly);
int Get_Max_Poly(int rings, int bands);
void Load_Torus(point3d *model, int rings, int bands,
                float ringradius, float bandradius);
void Set_Torus_Faces(poly *tri, int rings, int bands);

/* The screen surface */
SDL_Surface *screen = NULL;

GLfloat LightAmbient[]=  { 0.5f, 0.5f, 0.5f, 1.0f };	// Ambient Light Values
GLfloat LightDiffuse[]=	 { 1.0f, 1.0f, 1.0f, 1.0f };	// Diffuse Light Values
GLfloat LightPosition[]= { 0.0f, 0.0f, 2.0f, 1.0f };	// Light Position




int main (int argc, char *argv[])
{
    int done;
    static point3d *torus;
  	int max3dpoint =  TOR_NUM_RINGS * TOR_NUM_BANDS ;
	if (!(torus = new point3d[max3dpoint]))
	     exit(1);

	int maxpoly = Get_Max_Poly(TOR_NUM_RINGS, TOR_NUM_BANDS);
	static poly *torpoly;


  	if (!(torpoly = new poly[maxpoly]))
        exit (1);
    

        
  	Load_Torus (torus, TOR_NUM_RINGS, TOR_NUM_BANDS,
                TOR_RING_RAD, TOR_BAND_RAD);
	Set_Torus_Faces(torpoly, TOR_NUM_RINGS, TOR_NUM_BANDS);
                
    Init_SDL_GL(SCR_WIDTH, SCR_HEIGHT, SCR_BPP);
    Init_GL(SCR_WIDTH, SCR_HEIGHT);
    
    
    done = 0;
    
    while (!done)
    {
        SDL_Event event;

        /* Check for events */
        while (SDL_PollEvent (&event))
        {
            switch (event.type)
            {
               case SDL_KEYDOWN:
                  if ( event.key.keysym.sym == SDLK_ESCAPE )
                  {
                    done = 1;
                    break;
                  }
               case SDL_QUIT:
                  done = 1;
                  break;
               default:
                  break;
            }
        }

        /* Draw to screen */
        glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        Render_Scene (torus, torpoly, max3dpoint, maxpoly);
   		SDL_GL_SwapBuffers();
		SDL_PumpEvents();
    }

    SDL_Quit();
    return 0;
}

void Init_SDL_GL(int width, int height, int bpp)
{
    int SDL_flags;
    float FOVy, aspect, znear, zfar;
    SDL_flags = SDL_HWSURFACE | SDL_DOUBLEBUF | SDL_OPENGL; 
    //SDL_flags |=  SDL_FULLSCREEN;
    /* Initialize SDL */
    if (SDL_Init (SDL_INIT_VIDEO) < 0)
    {
       
        exit (1);
    }
    atexit (SDL_Quit);
    screen = SDL_SetVideoMode (width, height, bpp, SDL_flags);
    if (screen == NULL)
    {
       
        exit (2);
    }
    SDL_WM_SetCaption ("SDL+GL Test", NULL);

	
}

void Init_GL(int width, int height)
{
    glViewport (0, 0, width, height);
	glMatrixMode (GL_PROJECTION);
	glLoadIdentity();

    float FOVy = (float)80/2.0f;
    float aspect = (float)width / (float)height;
    float znear = 5.0f;
    float zfar = 1000.0f;
	gluPerspective (FOVy, aspect, znear, zfar);

	glMatrixMode (GL_MODELVIEW);
	glLoadIdentity();

	glShadeModel (GL_SMOOTH);
	glClearColor (0.0f, 0.0f, 0.0f, 0.5f);
	glClearDepth (1.0f);
	glEnable (GL_DEPTH_TEST);
	glDepthFunc (GL_LEQUAL);
	glEnable (GL_COLOR_MATERIAL);
	glHint (GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	
	/*glColor4f(1.0f,1.0f,1.0f,0.0f);			// Full Brightness, 0% Alpha ( NEW )
	glBlendFunc(GL_SRC_ALPHA,GL_ONE);		// Blending Function For Translucency 
	glEnable(GL_BLEND);		
	glDisable(GL_DEPTH_TEST);*/
	
	
	
	

}

void Render_Scene(point3d *model, poly *modeltri,
                  int max3dpoint, int tor_max_poly)
{
    static float tortheta = 0.00f;
    
    //torus
    glPushMatrix();
    glLoadIdentity();
    glTranslatef (0.0f, 0.0f, -10.0f);
    //glTranslatef (200.0f, 200.0f, -256.0f);
    glScalef (2.5f, 2.5f, 2.5f);
    glRotatef (tortheta, 1.0f, 0.0f, 0.0f);
    glRotatef (tortheta, 0.0f, 0.0f, 1.0f);
    glRotatef (tortheta, 0.0f, 1.0f, 0.0f);

	glBegin (GL_TRIANGLES);

		for (int i = 0; i < tor_max_poly; i++)
		{
       
    		 glColor3fv  (&model[modeltri.p1].r);
			 glVertex3fv (&model[modeltri.p1].x);

			 glColor3fv  (&model[modeltri.p2].r);
			 glVertex3fv (&model[modeltri.p2].x);

			 glColor3fv  (&model[modeltri.p3].r);
			 glVertex3fv (&model[modeltri.p3].x);
      
		}
	glEnd();


    glPopMatrix();
    tortheta += 1.0f;
    glFlush();

}

void Load_Torus(point3d *model, int rings, int bands,
                float ringradius, float bandradius)
{
	     
	float a1 = 2 * 3.141593f / (float)rings;
	float a2 = 2 * 3.141593f / (float)bands;
	int i = 0;
	for (int s2 = 0; s2 < bands; s2++)
	{
		for (int s1 = 0; s1 < rings; s1++)
		{
			float x1 = cos(s1 * a1) * ringradius;
			float y1 = sin(s1 * a1) * ringradius;

			model.x = x1 + cos(s1 * a1) * cos(s2 * a2) * bandradius;
			model.y = y1 + sin(s1 * a1) * cos(s2 * a2) * bandradius;
			model.z = sin(s2 * a2) * bandradius;
			model.r = (float)rand() / (float)RAND_MAX;
			model.g = (float)rand() / (float)RAND_MAX;
			model.b = (float)rand() / (float)RAND_MAX;
			i++;
		}
	}
}

int Get_Max_Poly(int rings, int bands)
{
  int i = 0;
  int maxtri = 0;
  for (int s1 = (bands - 1); s1 >= 0; s1--)
  {
	for (int s2 = (rings - 1); s2 >= 0; s2--)
	{
		i++;
		maxtri++;
		i++;
		maxtri++;
	}
  }
  return maxtri;
}

void Set_Torus_Faces(poly *tri, int rings, int bands)
{
	int maxpoint = rings * bands;
	int i = 0;

	int r, g, b;
	r = 64;
	g = 32;
	b = 16;
	for (int s1 = (bands - 1); s1 >= 0; s1--)
	{
		for (int s2 = (rings - 1); s2 >= 0; s2--)
		{
			tri.p3 = (s1 * rings + s2 + rings) % maxpoint;
			tri.p2 = s1 * rings + (s2 + 1) % rings;
			tri.p1 = s1 * rings + s2;
			tri.color = rgb(r,g,b);
			tri.idx = i;
			i++;
			tri.p3 = (s1 * rings + s2 + rings) % maxpoint;
			tri.p2 = (s1 * rings + (s2 + 1) % rings + rings) % maxpoint;
			tri.p1 = s1 * rings + (s2 + 1) % rings;
			tri.color =rgb(r,g,b);
			tri.idx = i;
			i++;
		}
	  }
}

Hi.

kman12

174

February 19, 2005 10:15 PM

IIRC, you have to set the project options to multi-threaded DLL somewhere to compile SDL apps in MSVC6. I forget exactly where it is, but maybe someone else remembers.

kman

Nightbird1225

126

February 19, 2005 10:32 PM

Look in the very first tut listed on the www.libsdl.org site.
it tells you in there.

-Nightbird

relsoft

Author

255

February 20, 2005 04:18 AM

kman: It's already set to 'multithreaded DLL"

Night: The settings this (http://sol.planet-d.net/gp/ch01.html) tells me are the same settings I have.

thanks anyways.

Hi.

Drew_Benton

1,865

February 20, 2005 12:56 PM

relsoft give this a try - In the linker tab I believe, there is a edit box to ignore specific libraries. Try adding in "LIBC.lib" and see if that works. I do not have my compiler installed currently so I can't point exactly where it is, but it's somewhere in that linker tab. If that does not work, then try using "msvcrt.lib" instead. I belieive its one of those.

- Drew

relsoft

Author

255

February 20, 2005 10:35 PM

Got it to compile for release. Thanks guys, My Ide somehow reverts back to single threaded even after I choose release and set it to multithreaded dll. I reinstalled and all worked fine. :*)

Hi.

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