Switch to using uniform buffer for MVP matrices

gpu.h

@@ -31,6 +31,12 @@ typedef struct {
 	VkFramebuffer framebuffers[SWAPCHAIN_IMG_BUFFER_SIZE];
 	VkShaderModule vert_shader;
 	VkShaderModule frag_shader;
+	VkDescriptorSetLayout desc_set_layout;
+	VkDescriptorPool desc_pool;
+	VkDescriptorSet desc_sets[SWAPCHAIN_IMG_BUFFER_SIZE];
+	VkBuffer mvp_buffer;
+	VkDeviceMemory mvp_buffer_mem;
+	mvp_t *mvps;
 	VkPipelineLayout pipeline_layout;
 	VkRenderPass render_pass;
 	VkPipeline pipeline;