v0.0.4

• Removed instancing
• Now there are four static cubes with minecraft grass texture
• You can move light up-down with c-space and on XZ axis after switching to light move mode clicking L key
• Light is drawn as little white cube
• first cube = plain texture, second cube = texture + specular, third cube = texture + diffuse, 4th cube = texture + phong
• added support for GPUs that don't support GL_ARB_gl_spirv extension