sprite.frag

#version 330 core

in vec2 v_texcoord;
in vec4 v_color;

uniform sampler2D u_tex;
uniform mat4 u_combined;

out vec4 f_color;

void main()
{
    f_color = texture(u_tex, v_texcoord) * v_color;
}

sprite.vert

#version 330 core

layout (location = 0) in vec3 a_position;
layout (location = 1) in vec4 a_color;
layout (location = 2) in vec2 a_texcoord;

out vec2 v_texcoord;
out vec4 v_color;

uniform mat4 u_combined;

void main()
{
    v_color = a_color;
    v_texcoord = a_texcoord;
    gl_Position = u_combined * vec4(a_position, 1.0f);
}