Add floor

gpu.h

@@ -28,11 +28,14 @@ typedef struct {
 	VkDeviceMemory depth_img_mem;
 	VkImageView depth_img_view;
 	VkFramebuffer framebuffers[MAX_FRAMES_IN_FLIGHT];
+	VkShaderModule floor_vert_shader;
 	VkShaderModule model_vert_shader;
 	VkShaderModule frag_shader;
 	VkDescriptorSetLayout desc_set_layout;
 	VkDescriptorPool desc_pool;
 	VkRenderPass render_pass;
+	VkPipelineLayout floor_pipeline_layout;
+	VkPipeline floor_pipeline;
 	VkPipelineLayout model_pipeline_layout;
 	VkPipeline model_pipeline;
 	VkCommandPool cmd_pool;