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OpenGL Need help running SDL and OpenGL on Visual Express

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Player_0    99
Hello! I just started to try and use Visual Studio Express and Im having problems with it. I got my SDL program running nicely and I was able to initialize OpenGL with it but as soon as I tried to use any GL functions I ran into some problems. It said the functions were undefined so I figured it wasn't seeing the opengl32.dll. I included the system32 directory where the dll is in Tools->Options->->Projects->Directories under the Library section but that didn't do anything. Is there some way of adding the DLL to yer project? Anyway I also tried including "gl\gl.h" and that brought up 142 errors out of no where so I need help. Any suggestions are appreciated.

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Drew_Benton    1861
When you use OpenGL though SDL, you will just have to link in the library files with your project and the .DLLs will be used. The libraries you will probabally need are "opengl32.lib" as well as "glu32.lib". If you are using DevCpp it will be "libopengl32.a" and "libglu32.a". Also, you will just need to include "SDL_Opengl.h" and everything else will be taken care of header file wise, you do not need to include gl.h yourself. Good luck!

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Player_0    99
I used #pragma to include Opengl32.lib. I didn't get any error which means it finds it and uses it just like the SDL libs, but I still get the error saying the gl functions are undefined.

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Drew_Benton    1861
Yes, after you create your project:

Project-><Project Name> Properties (Last time in menu)
Expand the "Configuration Properties"
Expand the "Linker" (Under c/c++)
Click on the "Input"
On the right pane, enter in "SDLmain.lib SDL.lib OpenGL32.lib GLU32.lib" without quotes into the first box, which is "Additional Dependecies"

Do the same thing for the release configuration of your project as well. Change the configuration using the top left corner's combo box.

If you still get linker errors, please use the [source] Your Errors Here [/source] tags to show us.

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Player_0    99
This is the source to the program, just basic initialization. The gl function is called at the bottom.

#include "SDL.h"

bool Init_SDL();
bool Init_OGL();

int main(int argc, char **argv)
if(Init_SDL() == 0) fprintf( stderr, "Init Error... Exiting.\n");
return 0;

bool Init_SDL()
const SDL_VideoInfo* info = NULL;
int width = 0;
int height = 0;
int bpp = 0;
int flags = 0;

if( SDL_Init( SDL_INIT_VIDEO ) < 0 ) {
/* Failed, exit. */
fprintf( stderr, "Video initialization failed: %s\n",
SDL_GetError( ) );
return 0;

info = SDL_GetVideoInfo( );

if( !info ) {
fprintf( stderr, "Video query failed: %s\n",
SDL_GetError( ) );
return 0;

width = 640;
height = 480;
bpp = info->vfmt->BitsPerPixel;

SDL_GL_SetAttribute( SDL_GL_RED_SIZE, 5 );
SDL_GL_SetAttribute( SDL_GL_GREEN_SIZE, 5 );
SDL_GL_SetAttribute( SDL_GL_BLUE_SIZE, 5 );
SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, 16 );

flags = SDL_OPENGL;

if( SDL_SetVideoMode( width, height, bpp, flags ) == 0 ) {
fprintf( stderr, "Video mode set failed: %s\n",
SDL_GetError( ) );
return 0;

return 1;

bool Init_OGL()
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);

return 1;

I added those libraries like you said and Im still getting:

------ Build started: Project: ProjectRPG, Configuration: Debug Win32 ------
c:\documents and settings\om\desktop\project 1\projectrpg\projectrpg\main.cpp(63) : error C3861: 'glClearColor': identifier not found
Build log was saved at "file://c:\Documents and Settings\Om\Desktop\Project 1\ProjectRPG\ProjectRPG\Debug\BuildLog.htm"
ProjectRPG - 1 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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