Vulkan: Fix struct init for VkClearAttachment

The changes from godotengine#38835 were not sufficient to fix godotengine#38829, as VkClearAttachment
still had uninitialized member structs in its VkClearColor member struct.

The struct rabbit hole goes deep and trying to do validation as done in godotengine#38829
doesn't appear realistic.

drivers/vulkan/rendering_device_vulkan.cpp

@@ -2997,16 +2997,10 @@ VkRenderPass RenderingDeviceVulkan::_render_pass_create(const Vector<AttachmentF
 		ERR_FAIL_COND_V_MSG(!(p_format[i].usage_flags & (TEXTURE_USAGE_COLOR_ATTACHMENT_BIT | TEXTURE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT | TEXTURE_USAGE_RESOLVE_ATTACHMENT_BIT)),
 				VK_NULL_HANDLE, "Texture format for index (" + itos(i) + ") requires an attachment (depth, stencil or resolve) bit set.");
 
-		VkAttachmentDescription description;
+		VkAttachmentDescription description = {};
 		description.flags = 0;
 		description.format = vulkan_formats[p_format[i].format];
 		description.samples = rasterization_sample_count[p_format[i].samples];
-		description.loadOp = VK_ATTACHMENT_LOAD_OP_MAX_ENUM; // Invalid value.
-		description.storeOp = VK_ATTACHMENT_STORE_OP_MAX_ENUM; // Invalid value.
-		description.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_MAX_ENUM; // Invalid value.
-		description.stencilStoreOp = VK_ATTACHMENT_STORE_OP_MAX_ENUM; // Invalid value.
-		description.initialLayout = VK_IMAGE_LAYOUT_MAX_ENUM; // Invalid value.
-		description.finalLayout = VK_IMAGE_LAYOUT_MAX_ENUM; // Invalid value.
 
 		bool is_depth_stencil = p_format[i].usage_flags & TEXTURE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
 		bool is_sampled = p_format[i].usage_flags & TEXTURE_USAGE_SAMPLING_BIT;
@@ -3120,15 +3114,6 @@ VkRenderPass RenderingDeviceVulkan::_render_pass_create(const Vector<AttachmentF
 			}
 		}
 
-		// Ensure VkAttachmentDescription has been initialized properly.
-		ERR_CONTINUE_MSG(description.loadOp == VK_ATTACHMENT_LOAD_OP_MAX_ENUM ||
-								 description.storeOp == VK_ATTACHMENT_STORE_OP_MAX_ENUM ||
-								 description.stencilLoadOp == VK_ATTACHMENT_LOAD_OP_MAX_ENUM ||
-								 description.stencilStoreOp == VK_ATTACHMENT_STORE_OP_MAX_ENUM ||
-								 description.initialLayout == VK_IMAGE_LAYOUT_MAX_ENUM ||
-								 description.finalLayout == VK_IMAGE_LAYOUT_MAX_ENUM,
-				"Bug: VkAttachmentDescription not initialized properly.");
-
 		attachments.push_back(description);
 
 		VkAttachmentReference reference;
@@ -5658,10 +5643,7 @@ void RenderingDeviceVulkan::_draw_list_insert_clear_region(DrawList *draw_list,
 	int color_index = 0;
 	for (int i = 0; i < framebuffer->texture_ids.size(); i++) {
 		Texture *texture = texture_owner.getornull(framebuffer->texture_ids[i]);
-		VkClearAttachment clear_at;
-		clear_at.aspectMask = VK_IMAGE_ASPECT_FLAG_BITS_MAX_ENUM; // Invalid value.
-		clear_at.colorAttachment = uint32_t(-1); // Invalid value.
-		clear_at.clearValue.depthStencil.stencil = uint32_t(-1); // Invalid value.
+		VkClearAttachment clear_at = {};
 
 		if (p_clear_color && texture->usage_flags & TEXTURE_USAGE_COLOR_ATTACHMENT_BIT) {
 			ERR_FAIL_INDEX(color_index, p_clear_colors.size()); //a bug
@@ -5683,13 +5665,6 @@ void RenderingDeviceVulkan::_draw_list_insert_clear_region(DrawList *draw_list,
 		} else {
 			ERR_CONTINUE(true);
 		}
-
-		// Ensure VkClearAttachment has been initialized properly.
-		ERR_CONTINUE_MSG(clear_at.aspectMask == VK_IMAGE_ASPECT_FLAG_BITS_MAX_ENUM ||
-								 clear_at.colorAttachment == uint32_t(-1) ||
-								 clear_at.clearValue.depthStencil.stencil == uint32_t(-1),
-				"Bug: VkClearAttachment not initialized properly.");
-
 		clear_attachments.push_back(clear_at);
 	}