Lowering requirements (needs more work)

data/shaders/skybox.frag

@@ -1,7 +1,7 @@
 #version 130
 
-out vec4 out_Color;
-in vec3 cardial_color;
+out vec4 out_Color; // Get rid of out keyword then set version to 110
+varying vec3 cardial_color;
 
 void main(void) {
 	out_Color = vec4(cardial_color.xyz, 1.0f);

data/shaders/skybox.vert

@@ -1,8 +1,8 @@
-#version 130
+#version 110
 
-in vec3 position;
-in vec3 color;
-out vec3 cardial_color;
+attribute vec3 position;
+attribute vec3 color;
+varying vec3 cardial_color;
 
 uniform mat4 projectionMatrix;
 uniform mat4 viewMatrix;

src/Application.cpp

@@ -54,7 +54,7 @@ void Application::initialize()
 
 	// Set GL Attributes
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
-	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 1);
 	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
 	SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);