X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=progs%2Fdemos%2Fsmooth_opengl3%2Fsmooth_opengl3.c;h=93e708d1c625957491cb3c04ca329937ef2d2fd2;hb=7ff5f34c5ec3b44e3bc6a022122fc101ed8f584f;hp=622b95cd22df08cf494665625824868e71c0763e;hpb=7f16b88649f41b77a0532422e3861e260d683d9f;p=freeglut

diff --git a/progs/demos/smooth_opengl3/smooth_opengl3.c b/progs/demos/smooth_opengl3/smooth_opengl3.c
index 622b95c..93e708d 100755
--- a/progs/demos/smooth_opengl3/smooth_opengl3.c
+++ b/progs/demos/smooth_opengl3/smooth_opengl3.c
@@ -153,9 +153,19 @@ void initExtensionEntries(void)
 {
    gl_GenVertexArrays = (PFNGLGENVERTEXARRAYSPROC) glutGetProcAddress ("glGenVertexArrays");
    gl_BindVertexArray = (PFNGLBINDVERTEXARRAYPROC) glutGetProcAddress ("glBindVertexArray");
+   if (!gl_GenVertexArrays || !gl_BindVertexArray)
+   {
+       fprintf (stderr, "glGenVertexArrays or glBindVertexArray not found");
+       exit(1);
+   }
    gl_GenBuffers = (PFNGLGENBUFFERSPROC) glutGetProcAddress ("glGenBuffers");
    gl_BindBuffer = (PFNGLBINDBUFFERPROC) glutGetProcAddress ("glBindBuffer");
    gl_BufferData = (PFNGLBUFFERDATAPROC) glutGetProcAddress ("glBufferData");
+   if (!gl_GenBuffers || !gl_BindBuffer || !gl_BufferData)
+   {
+       fprintf (stderr, "glGenBuffers, glBindBuffer or glBufferData not found");
+       exit(1);
+   }
    gl_CreateShader = (PFNGLCREATESHADERPROC) glutGetProcAddress ("glCreateShader");
    gl_ShaderSource = (PFNGLSHADERSOURCEPROC) glutGetProcAddress ("glShaderSource");
    gl_CompileShader = (PFNGLCOMPILESHADERPROC) glutGetProcAddress ("glCompileShader");
@@ -172,6 +182,11 @@ void initExtensionEntries(void)
    gl_EnableVertexAttribArray = (PFNGLENABLEVERTEXATTRIBARRAYPROC) glutGetProcAddress ("glEnableVertexAttribArray");
    gl_GetUniformLocation = (PFNGLGETUNIFORMLOCATIONPROC) glutGetProcAddress ("glGetUniformLocation");
    gl_UniformMatrix4fv = (PFNGLUNIFORMMATRIX4FVPROC) glutGetProcAddress ("glUniformMatrix4fv");
+   if (!gl_CreateShader || !gl_ShaderSource || !gl_CompileShader || !gl_CreateProgram || !gl_AttachShader || !gl_LinkProgram || !gl_UseProgram || !gl_GetShaderiv || !gl_GetShaderInfoLog || !gl_GetProgramiv || !gl_GetProgramInfoLog || !gl_GetAttribLocation || !gl_VertexAttribPointer || !gl_EnableVertexAttribArray || !gl_GetUniformLocation || !gl_UniformMatrix4fv)
+   {
+       fprintf (stderr, "glCreateShader, glShaderSource, glCompileShader, glCreateProgram, glAttachShader, glLinkProgram, glUseProgram, glGetShaderiv, glGetShaderInfoLog, glGetProgramiv, glGetProgramInfoLog, glGetAttribLocation, glVertexAttribPointer, glEnableVertexAttribArray, glGetUniformLocation or glUniformMatrix4fv not found");
+       exit(1);
+   }
 }
 
 /* vertex array data for a colored 2D triangle, consisting of RGB color values
@@ -419,8 +434,12 @@ void keyboard(unsigned char key, int x, int y)
    }
 }
 
+void samplemenu(int menuID)
+{}
+
 int main(int argc, char** argv)
 {
+   int menuA;
    glutInit(&argc, argv);
    glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
    /* add command line argument "classic" for a pre-3.x context */
@@ -436,6 +455,15 @@ int main(int argc, char** argv)
    glutDisplayFunc(display); 
    glutReshapeFunc(reshape);
    glutKeyboardFunc (keyboard);
+
+   /* Add a menu. They have their own context and should thus work with forward compatible main windows too. */
+   menuA = glutCreateMenu(samplemenu);
+   glutAddMenuEntry("Sub menu A1 (01)",1);
+   glutAddMenuEntry("Sub menu A2 (02)",2);
+   glutAddMenuEntry("Sub menu A3 (03)",3);
+   glutSetMenu(menuA);
+   glutAttachMenu(GLUT_RIGHT_BUTTON);
+
    glutMainLoop();
    return 0;
 }