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buteman
01-15-2014, 02:22 PM
I tried to compile a program I am developing but it complains about gl3.h being missing. i have searched all over but cannot find it. Even here on the opengl site there is a link to it but it is a dead link.
Any idea how I can resolve this please?



#include <stdio.h>
#include <stdlib.h>
/* If using gl3.h */
/* Ensure we are using opengl's core profile only */
#define GL3_PROTOTYPES 1
#include <GL/gl3.h>

#include <SDL.h>
#define PROGRAM_NAME "Tutorial1"

/* A simple function that prints a message, the error code returned by SDL,
* and quits the application */
void sdldie(const char *msg)
{
printf("%s: %s\n", msg, SDL_GetError());
SDL_Quit();
exit(1);
}


void checkSDLError(int line ) /*= -1)*/
{
#ifndef NDEBUG
const char *error = SDL_GetError();
if (*error != '\0')
{
printf("SDL Error: %s\n", error);
if (line != -1)
printf(" + line: %i\n", line);
SDL_ClearError();
}
#endif
}


/* Our program's entry point */
int main(int argc, char *argv[])
{
SDL_Window *mainwindow; /* Our window handle */
SDL_GLContext maincontext; /* Our opengl context handle */

if (SDL_Init(SDL_INIT_VIDEO) < 0) /* Initialize SDL's Video subsystem */
sdldie("Unable to initialize SDL"); /* Or die on error */

/* Request opengl 3.2 context.
* SDL doesn't have the ability to choose which profile at this time of writing,
* but it should default to the core profile */
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);

/* Turn on double buffering with a 24bit Z buffer.
* You may need to change this to 16 or 32 for your system */
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);

/* Create our window centered at 512x512 resolution */
mainwindow = SDL_CreateWindow(PROGRAM_NAME, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
512, 512, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
if (!mainwindow) /* Die if creation failed */
sdldie("Unable to create window");

checkSDLError(__LINE__);

/* Create our opengl context and attach it to our window */
maincontext = SDL_GL_CreateContext(mainwindow);
checkSDLError(__LINE__);


/* This makes our buffer swap syncronized with the monitor's vertical refresh */
SDL_GL_SetSwapInterval(1);

/* Clear our buffer with a red background */
glClearColor ( 1.0, 0.0, 0.0, 1.0 );
glClear ( GL_COLOR_BUFFER_BIT );
/* Swap our back buffer to the front */
SDL_GL_SwapWindow(mainwindow);
/* Wait 2 seconds */
SDL_Delay(2000);

/* Same as above, but green */
glClearColor ( 0.0, 1.0, 0.0, 1.0 );
glClear ( GL_COLOR_BUFFER_BIT );
SDL_GL_SwapWindow(mainwindow);
SDL_Delay(2000);

/* Same as above, but blue */
glClearColor ( 0.0, 0.0, 1.0, 1.0 );
glClear ( GL_COLOR_BUFFER_BIT );
SDL_GL_SwapWindow(mainwindow);
SDL_Delay(2000);

/* Delete our opengl context, destroy our window, and shutdown SDL */
SDL_GL_DeleteContext(maincontext);
SDL_DestroyWindow(mainwindow);
SDL_Quit();

return 0;
}


I am trying to compile it with


gcc tut1.c -lGL $(sdl-config --cflags --libs)