Streak324 Streak324 - 1 month ago 26
Linux Question

OpenGL 3.3 on Arch Linux

I need help doing some OpenGL 3.3 programming with core profile. I'm running on an Arch Linux OS with the packages

xf86-video-intel
and
mesa-libgl
installed. I have Intel HD 4400 built into my CPU

When I enter
glxinfo | grep OpenGL
into terminal, It shows I can support OpenGL 3.3

OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile
OpenGL core profile version string: 3.3 (Core Profile) Mesa 12.0.3
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 12.0.3
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 12.0.3
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:


I'm using GLFW3 and GLEW to setup OpenGL

if(!glfwInit()) {
return -1;
}
GLFWwindow* window = glfwCreateWindow(800, 600, "Hello Guys", NULL, NULL);
if(!window) {
glfwTerminate();
return -1;
}

glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

glfwMakeContextCurrent(window);

if(glewInit() != GLEW_OK) {
printf("GLEW did not initialize\n");
glfwTerminate();
return -1;
}


However, when I try to compile shaders, I get the error
GLSL 3.30 is not supported. Supported versions are: 1.10, 1.20, 1.30, 1.00 ES, and 3.00 ES


It seems Mesa or GLFW3 is making my PC use the forward compatible profile instead of the core profile. How can I fix this?

Answer

From the docs (emphasis mine):

void glfwWindowHint( int hint, int value )        

This function sets hints for the next call to glfwCreateWindow. ...

So: set hints before you create the window:

glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

GLFWwindow* window = glfwCreateWindow(800, 600, "Hello Guys", NULL, NULL);
if(!window) {
    glfwTerminate();
    return -1;
}