Renderer/Texture: Add static helpers

src/Nazara/Renderer/Texture.cpp

@@ -3,9 +3,72 @@
 // For conditions of distribution and use, see copyright notice in Config.hpp
 
 #include <Nazara/Renderer/Texture.hpp>
+#include <Nazara/Core/Error.hpp>
+#include <Nazara/Renderer/RenderDevice.hpp>
+#include <Nazara/Utility/Image.hpp>
 #include <Nazara/Renderer/Debug.hpp>
 
 namespace Nz
 {
 	Texture::~Texture() = default;
+
+	bool TextureParams::IsValid() const
+	{
+		if (!ImageParams::IsValid())
+			return false;
+
+		if (!renderDevice)
+		{
+			NazaraError("no render device set");
+			return false;
+		}
+
+		if (!usageFlags)
+		{
+			NazaraError("a texture should have at least one usage flag");
+			return false;
+		}
+
+		return true;
+	}
+
+	std::shared_ptr<Texture> Texture::CreateFromImage(const Image& image, const TextureParams& params)
+	{
+		NazaraAssert(params.IsValid(), "Invalid TextureParams");
+
+		Nz::TextureInfo texParams;
+		texParams.depth = image.GetDepth();
+		texParams.height = image.GetHeight();
+		texParams.pixelFormat = image.GetFormat();
+		texParams.type = image.GetType();
+		texParams.width = image.GetWidth();
+		texParams.usageFlags = params.usageFlags;
+
+		std::shared_ptr<Nz::Texture> texture = params.renderDevice->InstantiateTexture(texParams);
+		if (!texture->Update(image.GetConstPixels()))
+		{
+			NazaraError("failed to update texture");
+			return {};
+		}
+
+		return texture;
+	}
+
+	std::shared_ptr<Texture> Texture::LoadFromFile(const std::filesystem::path& filePath, const TextureParams& params)
+	{
+		std::shared_ptr<Image> image = Image::LoadFromFile(filePath, params);
+		return CreateFromImage(*image, params);
+	}
+
+	std::shared_ptr<Texture> Texture::LoadFromMemory(const void* data, std::size_t size, const TextureParams& params)
+	{
+		std::shared_ptr<Image> image = Image::LoadFromMemory(data, size, params);
+		return CreateFromImage(*image, params);
+	}
+
+	std::shared_ptr<Texture> Texture::LoadFromStream(Stream& stream, const TextureParams& params)
+	{
+		std::shared_ptr<Image> image = Image::LoadFromStream(stream, params);
+		return CreateFromImage(*image, params);
+	}
 }