From 2f18d74f9ab3165da680ce2ee2f0c455ce7e0796 Mon Sep 17 00:00:00 2001
From: Cosmic Linden <cosmic@lindenlab.com>
Date: Mon, 13 Nov 2023 17:26:14 -0800
Subject: SL-20606: Full GLTF material preview. Works for most materials.

---
 indra/newview/llgltfmaterialpreviewmgr.h | 82 ++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 indra/newview/llgltfmaterialpreviewmgr.h

(limited to 'indra/newview/llgltfmaterialpreviewmgr.h')

diff --git a/indra/newview/llgltfmaterialpreviewmgr.h b/indra/newview/llgltfmaterialpreviewmgr.h
new file mode 100644
index 0000000000..cc40a6f2e2
--- /dev/null
+++ b/indra/newview/llgltfmaterialpreviewmgr.h
@@ -0,0 +1,82 @@
+/**
+ * @file llgltfmaterialpreviewmgr.h
+ *
+ * $LicenseInfo:firstyear=2023&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2023, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+#include "lldrawpool.h"
+#include "lldynamictexture.h"
+#include "llfetchedgltfmaterial.h"
+#include "llsingleton.h"
+#include "lltexture.h"
+
+class LLGLTFPreviewTexture : public LLViewerDynamicTexture
+{
+protected:
+    LLGLTFPreviewTexture(LLPointer<LLFetchedGLTFMaterial> material, S32 width);
+
+public:
+    // Width scales with size of material's textures
+    static LLPointer<LLGLTFPreviewTexture> create(LLPointer<LLFetchedGLTFMaterial> material);
+
+    BOOL needsRender() override { return mNeedsRender; }
+    void preRender(BOOL clear_depth = TRUE) override;
+    BOOL render() override;
+    void postRender(BOOL success) override;
+
+    struct MaterialLoadLevels
+    {
+        S32 levels[LLGLTFMaterial::GLTF_TEXTURE_INFO_COUNT];
+
+        MaterialLoadLevels();
+
+        S32& operator[](size_t i);
+
+        const S32& operator[](size_t i) const;
+
+        // Less is better
+        // Returns false if lhs is not strictly less or equal for all levels
+        bool operator<(const MaterialLoadLevels& other) const;
+
+        // Less is better
+        // Returns false if lhs is not strictly greater or equal for all levels
+        bool operator>(const MaterialLoadLevels& other) const;
+    };
+
+private:
+    LLPointer<LLFetchedGLTFMaterial> mGLTFMaterial;
+    bool mNeedsRender = true;
+    bool mShouldRender = true;
+    MaterialLoadLevels mBestLoad;
+};
+
+class LLGLTFMaterialPreviewMgr
+{
+  public:
+    // Returns null if the material is not loaded yet.
+    // *NOTE: User should cache the texture if the same material is being previewed
+    LLPointer<LLViewerTexture> getPreview(LLPointer<LLFetchedGLTFMaterial> &material);
+};
+
+extern LLGLTFMaterialPreviewMgr gGLTFMaterialPreviewMgr;
-- 
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