Hi,

I'm writing a simple game engine and I'm using glfw. I'm trying to make this work on both Mac and Windows. I'm a bit confused about what happens on Win. This is the way I initialize glfw:

if (!glfwInit())
	exit(-1);

//glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
//glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
//glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
//glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
        
window = glfwCreateWindow(width, height, appName, NULL, NULL);
if (!window) {	
	glfwTerminate();
	exit(-1);
}
glfwMakeContextCurrent(window);

With this initialization, everything works and I can render correctly a test quad on the screen. Just to give you an idea, this is the renderer and OpenGL version I get:

Renderer: Quadro NVS 295/PCIe/SSE2
OpenGL version supported 3.3.0

If however I uncomment the first three glfwWindowHint, everything works but I don't see anything on the screen (the same happens on the Mac). I still see that the OpenGL version supported is 3.3.0. Why the quad stops being rendered when I hint the GL version? For completeness, these are the shaders I'm using (very simple)

#version 330 core

layout(location=0) in vec3 g_position;
layout(location=2) in vec2 g_texcoord;

uniform mat4 g_mvMat;
uniform mat4 g_projMat;

out vec2 Tex;

void main ()
{
	Tex = g_texcoord;
	gl_Position = g_projMat * g_mvMat * vec4 ( g_position, 1.0 );
}

#version 330 core

in vec3 Position;
in vec2 Tex;

out vec4 fragColor;

uniform sampler2D Tex1;

void main()
{
	vec4 texColor = texture( Tex1, Tex );
    if (texColor.a < 0.5)
        discard;
	fragColor = texColor;

}

Thanks!

For anyone who has the same problem, I found that the app didn't render anything because I was not using VAO, and in core profile they are mandatory!