Add floor

CMakeLists.txt

@@ -30,10 +30,12 @@ function(add_shaders target)
 endfunction()
 
 add_shaders(shaders
+  floor-vert.glsl
   model-vert.glsl
   default-frag.glsl
 )
 target_compile_definitions(shaders INTERFACE
+  FLOOR_VERT_SHADER_SPV="${CMAKE_CURRENT_BINARY_DIR}/shaders/floor-vert.spv"
   MODEL_VERT_SHADER_SPV="${CMAKE_CURRENT_BINARY_DIR}/shaders/model-vert.spv"
   FRAG_SHADER_SPV="${CMAKE_CURRENT_BINARY_DIR}/shaders/default-frag.spv")