Multitexture rendering prototyping.

data/multi_texture.vert

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+#version 450
+
+layout(binding = 0) uniform Uniform_Buffer_Object {
+  mat4 model;
+  mat4 view;
+  mat4 proj;
+} ubo;
+
+layout(location = 0) in vec3 in_position;
+layout(location = 1) in vec3 in_color;
+layout(location = 2) in vec2 in_tex_coord;
+layout(location = 3) in vec2 in_tex_coord2;
+
+layout(location = 0) out vec3 frag_color;
+layout(location = 1) out vec2 frag_tex_coord;
+layout(location = 2) out vec2 frag_tex_coord2;
+
+out gl_PerVertex {
+    vec4 gl_Position;
+};
+
+void main() {
+    gl_Position = ubo.proj * ubo.view * ubo.model * vec4(in_position, 1.0);
+    frag_color = in_color;
+    frag_tex_coord = in_tex_coord;
+    frag_tex_coord2 = in_tex_coord2;
+}