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Drawing nearest pixel #77

@Synismusist

Description

@Synismusist

By default Walnut::Image is set to use linear filter and not nearest filter. I changed the magFilter, minFilter and mipmapMode in the VkSamplerCreateInfo to nearest, but i still get interpolation between pixels. Does anyone know if there is something else i must change?

`

void Image::AllocateMemory(uint64_t size)
{
	VkDevice device = Walnut::Application::GetDevice();

	VkResult err;

	VkFormat vulkanFormat = Utils::WalnutFormatToVulkanFormat(m_Format);

	// Create the Image
	{
		uint32_t queueFamilyIndices[2] = { Walnut::Application::GetGraphicsQueueFamily(), Walnut::Application::GetComputeQueueFamily() };
		VkImageCreateInfo info = {};
		info.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
		info.imageType = VK_IMAGE_TYPE_2D;
		info.format = vulkanFormat;
		info.extent.width = m_Width;
		info.extent.height = m_Height;
		info.extent.depth = 1;
		info.mipLevels = 1;
		info.arrayLayers = 1;
		info.samples = VK_SAMPLE_COUNT_1_BIT;
		info.tiling = VK_IMAGE_TILING_OPTIMAL;
		info.usage = VK_IMAGE_USAGE_SAMPLED_BIT | VK_IMAGE_USAGE_TRANSFER_DST_BIT;
		info.sharingMode = VK_SHARING_MODE_CONCURRENT;
		info.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
		info.pQueueFamilyIndices = queueFamilyIndices;
		info.queueFamilyIndexCount = 2;
		err = vkCreateImage(device, &info, nullptr, &m_Image);
		check_vk_result(err);
		VkMemoryRequirements req;
		vkGetImageMemoryRequirements(device, m_Image, &req);
		VkMemoryAllocateInfo alloc_info = {};
		alloc_info.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
		alloc_info.allocationSize = req.size;
		alloc_info.memoryTypeIndex = Utils::GetVulkanMemoryType(VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, req.memoryTypeBits);
		err = vkAllocateMemory(device, &alloc_info, nullptr, &m_Memory);
		check_vk_result(err);
		err = vkBindImageMemory(device, m_Image, m_Memory, 0);
		check_vk_result(err);
	}

	// Create the Image View:
	{
		VkImageViewCreateInfo info = {};
		info.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
		info.image = m_Image;
		info.viewType = VK_IMAGE_VIEW_TYPE_2D;
		info.format = vulkanFormat;
		info.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
		info.subresourceRange.levelCount = 1;
		info.subresourceRange.layerCount = 1;
		err = vkCreateImageView(device, &info, nullptr, &m_ImageView);
		check_vk_result(err);
	}

	// Create sampler:
	{
		VkSamplerCreateInfo info = {};
		info.sType = VK_STRUCTURE_TYPE_SAMPLER_CREATE_INFO;
		info.magFilter = VK_FILTER_NEAREST;
		info.minFilter = VK_FILTER_NEAREST;
		info.mipmapMode = VK_SAMPLER_MIPMAP_MODE_NEAREST;
		info.addressModeU = VK_SAMPLER_ADDRESS_MODE_REPEAT;
		info.addressModeV = VK_SAMPLER_ADDRESS_MODE_REPEAT;
		info.addressModeW = VK_SAMPLER_ADDRESS_MODE_REPEAT;
		info.mipLodBias = 0.f;
		info.minLod = 0.f;
		info.maxLod = 0.f;
		info.anisotropyEnable = VK_FALSE;
		info.maxAnisotropy = 0.f;
		info.unnormalizedCoordinates = VK_FALSE;
		VkResult err = vkCreateSampler(device, &info, nullptr, &m_Sampler);
		check_vk_result(err);
	}

	// Create the Descriptor Set:
	m_DescriptorSet = (VkDescriptorSet)ImGui_ImplVulkan_AddTexture(m_Sampler, m_ImageView, VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
}

`

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