ShaderNode: Add preview / cast / texture sampling

src/ShaderNode/Previews/PreviewModel.cpp

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+#include <Previews/PreviewModel.hpp>
+
+PreviewModel::~PreviewModel() = default;

src/ShaderNode/Previews/PreviewModel.hpp

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+#pragma once
+
+#ifndef NAZARA_SHADERNODES_PREVIEWMODEL_HPP
+#define NAZARA_SHADERNODES_PREVIEWMODEL_HPP
+
+#include <Enums.hpp>
+
+class QImage;
+
+class PreviewModel
+{
+	public:
+		PreviewModel() = default;
+		virtual ~PreviewModel();
+
+		virtual QImage GetImage(InputRole role, std::size_t roleIndex) const = 0;
+};
+
+#include <Previews/PreviewModel.inl>
+
+#endif

src/ShaderNode/Previews/PreviewModel.inl

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+#include <Previews/PreviewModel.hpp>

src/ShaderNode/Previews/QuadPreview.cpp

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+#include <Previews/QuadPreview.hpp>
+#include <cassert>
+
+QImage QuadPreview::GetImage(InputRole role, std::size_t roleIndex) const
+{
+	assert(role == InputRole::TexCoord);
+	assert(roleIndex == 0);
+
+	QImage uv(128, 128, QImage::Format_RGBA8888);
+
+	std::uint8_t* content = uv.bits();
+	for (std::size_t y = 0; y < 128; ++y)
+	{
+		for (std::size_t x = 0; x < 128; ++x)
+		{
+			*content++ = (x * 255) / 128;
+			*content++ = (y * 255) / 128;
+			*content++ = 0;
+			*content++ = 255;
+		}
+	}
+
+	return uv;
+}

src/ShaderNode/Previews/QuadPreview.hpp

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+#pragma once
+
+#ifndef NAZARA_SHADERNODES_QUADPREVIEW_HPP
+#define NAZARA_SHADERNODES_QUADPREVIEW_HPP
+
+#include <Previews/PreviewModel.hpp>
+#include <QtGui/QImage>
+
+class QuadPreview : public PreviewModel
+{
+	public:
+		QuadPreview() = default;
+		~QuadPreview() = default;
+
+		QImage GetImage(InputRole role, std::size_t roleIndex) const override;
+};
+
+#include <Previews/QuadPreview.inl>
+
+#endif

src/ShaderNode/Previews/QuadPreview.inl

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+#include <Previews/QuadPreview.hpp>