new stuff

vendor/assimp/tools/assimp_view/MaterialManager.h

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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2026, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the following
+conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+---------------------------------------------------------------------------
+*/
+
+#pragma once
+
+#include <map>
+
+#include "AssetHelper.h"
+
+namespace AssimpView {
+
+//-------------------------------------------------------------------------------
+/* Helper class to create, access and destroy materials
+    */
+//-------------------------------------------------------------------------------
+class CMaterialManager {
+    friend class CDisplay;
+
+public:
+    //------------------------------------------------------------------
+    // Singleton accessors
+    inline static CMaterialManager &Instance() {
+        return s_cInstance;
+    }
+
+    //------------------------------------------------------------------
+    // Delete all resources of a given material
+    //
+    // Must be called before CreateMaterial() to prevent memory leaking
+    void DeleteMaterial(AssetHelper::MeshHelper *pcIn);
+
+    /// @brief  Create the material for a mesh.
+    ///
+    /// The function checks whether an identical shader is already in use.
+    /// A shader is considered to be identical if it has the same input
+    /// signature and takes the same number of texture channels.
+    int CreateMaterial(AssetHelper::MeshHelper *pcMesh, const aiMesh *pcSource);
+
+    ///	@brief  Setup the material for a given mesh.
+    /// @param  pcMesh   Mesh to be rendered
+    /// @param  pcProj   Projection matrix
+    /// @param  aiMe     Current world matrix
+    /// @param  pcCam    Camera matrix
+    /// @param  vPos     Position of the camera
+    /// @return 0 if successful.
+    int SetupMaterial(AssetHelper::MeshHelper *pcMesh,
+            const aiMatrix4x4 &pcProj,
+            const aiMatrix4x4 &aiMe,
+            const aiMatrix4x4 &pcCam,
+            const aiVector3D &vPos);
+
+    //------------------------------------------------------------------
+    // End the material for a given mesh
+    // Called after mesh rendering is complete
+    // pcMesh Mesh object
+    int EndMaterial(AssetHelper::MeshHelper *pcMesh);
+
+    //------------------------------------------------------------------
+    // Recreate all specular materials depending on the current
+    // specularity settings
+    //
+    // Diffuse-only materials are ignored.
+    // Must be called after specular highlights have been toggled
+    int UpdateSpecularMaterials();
+
+    //------------------------------------------------------------------
+    // find a valid path to a texture file
+    //
+    // Handle 8.3 syntax correctly, search the environment of the
+    // executable and the asset for a texture with a name very similar
+    // to a given one
+    int FindValidPath(aiString *p_szString);
+
+    //------------------------------------------------------------------
+    // Load a texture into memory and create a native D3D texture resource
+    //
+    // The function tries to find a valid path for a texture
+    int LoadTexture(IDirect3DTexture9 **p_ppiOut, aiString *szPath);
+
+    //------------------------------------------------------------------
+    // Getter for m_iShaderCount
+    //
+    inline unsigned int GetShaderCount() {
+        return this->m_iShaderCount;
+    }
+
+    //------------------------------------------------------------------
+    // Reset the state of the class
+    // Called whenever a new asset is loaded
+    inline void Reset() {
+        m_iShaderCount = 0;
+        for (auto & sCachedTexture : sCachedTextures) {
+            sCachedTexture.second->Release();
+        }
+        sCachedTextures.clear();
+    }
+
+private:
+    // The default constructor
+    CMaterialManager() :
+            m_iShaderCount(0),
+            sDefaultTexture() {
+        // empty
+    }
+
+    // Destructor, private.
+    ~CMaterialManager() {
+        if (sDefaultTexture) {
+            sDefaultTexture->Release();
+        }
+        Reset();
+    }
+
+    //------------------------------------------------------------------
+    // find a valid path to a texture file
+    //
+    // Handle 8.3 syntax correctly, search the environment of the
+    // executable and the asset for a texture with a name very similar
+    // to a given one
+    bool TryLongerPath(char *szTemp, aiString *p_szString);
+
+    //------------------------------------------------------------------
+    // Setup the default texture for a texture channel
+    //
+    // Generates a default checker pattern for a texture
+    int SetDefaultTexture(IDirect3DTexture9 **p_ppiOut);
+
+    //------------------------------------------------------------------
+    // Convert a height map to a normal map if necessary
+    //
+    // The function tries to detect the type of a texture automatically.
+    // However, this won't work in every case.
+    void HMtoNMIfNecessary(IDirect3DTexture9 *piTexture,
+            IDirect3DTexture9 **piTextureOut,
+            bool bWasOriginallyHM = true);
+
+    //------------------------------------------------------------------
+    // Search for non-opaque pixels in a texture
+    //
+    // A pixel is considered to be non-opaque if its alpha value is
+    // less than 255
+    //------------------------------------------------------------------
+    bool HasAlphaPixels(IDirect3DTexture9 *piTexture);
+
+private:
+    static CMaterialManager s_cInstance;
+
+    // Specifies the number of different shaders generated for
+    // the current asset. This number is incremented by CreateMaterial()
+    // each time a shader isn't found in cache and needs to be created
+    unsigned int m_iShaderCount;
+    IDirect3DTexture9 *sDefaultTexture;
+    using TextureCache = std::map<std::string, IDirect3DTexture9 *>;
+    TextureCache sCachedTextures;
+};
+
+} // namespace AssimpView