Basic vertex shader.

Default.vs

#version 330

// Input from program: vertex, texture coordinates,
// and color.
//
// In IronClad, these are part of a vertex2_t struct
// that is passed to the VBO after being loaded with
// mesh data.
smooth   in vec2     vs_vertex;
smooth   in vec2     vs_texc;
smooth   in vec4     vs_color;

// Projection and model-view (basically position) matrices.
uniform mat4 proj;
uniform mat4 mv;

// To fragment shader, color and texture coordinates.
smooth  out vec4 fs_color;
smooth  out vec2 fs_texc;

void main()
{
    gl_Position = proj * mv * vec4(vs_vertex, 1.0, 1.0);
    fs_color    = vs_color;
    fs_texc     = vs_texc;
}