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POHello World OpenGL program: "glEnableVertexAttribArray was not declared it this scope"
 

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  1. POHello World OpenGL program: "glEnableVertexAttribArray was not declared it this scope"
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    <p>It's getting frustrating. I've been trying to get a simple hello world type program to run, but it just isn't happening.</p> <p>I'm using Windows 7 and my graphics card does support the newer OpenGL stuff. Writing in C with freeglut, and I am compiling with MinGW and Code::Blocks. In the linker I have freeglut, opengl32 and glu32. I keep the freeglut stuff in the freeglut folder that is located in my MinGW folder, so under search directories in my build settings I have "C:\MinGW\freeglut\include" for the compiler and "C:\MinGW\freeglut\lib" for the linker.</p> <p>Here's my code:</p> <pre><code>#include &lt;stdlib.h&gt; #include &lt;GL/glut.h&gt; void NIAppIdle(void); void NIAppDisplay(void); int main(int argc, char *argv[]) { // Setup windwing glutInit(&amp;argc, argv); glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE); glutInitWindowSize(800, 600); glutCreateWindow("HELLO WORLD"); // Define GLUT callbacks glutIdleFunc(NIAppIdle); glutDisplayFunc(NIAppDisplay); // Enter render loop glutMainLoop(); return 0; } void NIAppIdle(void) { glutPostRedisplay(); } void NIAppDisplay(void) { glClearColor(0.0f, 1.0f, 0.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); float geometry[] = { -0.5f, 0.5f, 0.0f, 1.0f, 0.5f, -5.0f, 0.0f, 1.0f, 0.0f, 0.5f, 0.0f, 1.0f }; glEnableVertexAttribArray(0); glVertexAttribPointer(0, 4, GL_FLOAT, 0, 0, geometry); glDrawArrays(GL_TRIANGLES, 0, 3); glutSwapBuffers(); } </code></pre> <p>The problem is with the "glEnableVertexAttribArray" and "glVertexAttribPointer" functions. The compiler says that they are "not declared it this scope".</p> <p>Program can run without those lines, so I guess OpenGL is linked properly, but I simply can't use those functions for some reason, and I know they are a part of OpenGL. Is it something to do with the version of OpenGL I have or something?</p> <p>Anyway, it is my first time learning OpenGL, I've probably done something horribly wrong, so I'm asking for somebody to help me. I'm sorry if this post seems a bit crappy, this is also my first time posting in this site. Also I'm sorry for my grammar, English isn't my first language.</p>
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    1. COWhere did you get this "Hello World" program from?
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    2. COhttp://www.eng.utah.edu/~cs5600/schedule.html Lecture 15 - Hardware Acceleration, the video
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