100 lines
3.7 KiB
C++
100 lines
3.7 KiB
C++
#include "GenerateMikkTSpaceTangents.h"
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#include <assimp/scene.h>
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#include <assimp/postprocess.h>
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namespace Assimp {
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static int get_num_faces(const SMikkTSpaceContext *context);
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static int get_num_vertices_of_face(const SMikkTSpaceContext *context, int iFace);
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static void get_position(const SMikkTSpaceContext *context, float outpos[], int iFace, int iVert);
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static void get_normal(const SMikkTSpaceContext *context, float outnormal[], int iFace, int iVert);
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static void get_tex_coords(const SMikkTSpaceContext *context, float outuv[], int iFace, int iVert);
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static void set_tspace_basic(const SMikkTSpaceContext *context, const float tangentu[], float fSign, int iFace, int iVert);
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static int get_num_faces(const SMikkTSpaceContext *context) {
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const aiMesh *currentMesh = static_cast<aiMesh*>(context->m_pUserData);
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const int numFaces = static_cast<int>(currentMesh->mNumFaces);
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return numFaces;
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}
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static int get_num_vertices_of_face(const SMikkTSpaceContext *context, int iFace) {
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const aiMesh *currentMesh = static_cast<aiMesh*>(context->m_pUserData);
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const aiFace &face = currentMesh->mFaces[iFace];
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return face.mNumIndices;
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}
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static void get_position(const SMikkTSpaceContext *context, float outpos[], int /*iFace*/, int iVert) {
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const aiMesh *currentMesh = static_cast<aiMesh*>(context->m_pUserData);
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const aiVector3D &v = currentMesh->mVertices[static_cast<size_t>(iVert)];
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outpos[0] = v.x;
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outpos[1] = v.y;
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outpos[2] = v.z;
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}
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static void get_normal(const SMikkTSpaceContext *context, float outnormal[], int /*iFace*/, int iVert) {
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const aiMesh *currentMesh = static_cast<aiMesh*>(context->m_pUserData);
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const aiVector3D &n = currentMesh->mNormals[static_cast<size_t>(iVert)];
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outnormal[0] = n.x;
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outnormal[1] = n.y;
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outnormal[2] = n.z;
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}
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static void get_tex_coords(const SMikkTSpaceContext *context, float outuv[], int /*iFace*/, int iVert) {
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const aiMesh *currentMesh = static_cast<aiMesh*>(context->m_pUserData);
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aiVector3D &t = currentMesh->mTextureCoords[static_cast<size_t>(iVert)][0];
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if (currentMesh->mNumUVComponents[iVert] == 2) {
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outuv[0] = t.x;
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outuv[1] = t.y;
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} else if (currentMesh->mNumUVComponents[iVert] == 3){
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outuv[0] = t.x;
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outuv[1] = t.y;
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outuv[2] = 0.0;
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}
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}
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static void set_tspace_basic(const SMikkTSpaceContext *context, const float tangentu[], float /*fSign*/, int /*iFace*/, int iVert) {
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const aiMesh *currentMesh = static_cast<aiMesh*>(context->m_pUserData);
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currentMesh->mTangents[iVert].x = tangentu[0];
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currentMesh->mTangents[iVert].y = tangentu[1];
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currentMesh->mTangents[iVert].z = tangentu[2];
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}
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bool GenerateMikkTSpaceTangents::IsActive(unsigned int pFlags) const {
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const bool active = (pFlags & aiProcess_CalcTangentSpace) != 0;
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if (mActive) {
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return active;
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}
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return false;
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}
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void GenerateMikkTSpaceTangents::Execute(aiScene* pScene) {
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mIface.m_getNumFaces = get_num_faces;
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mIface.m_getNumVerticesOfFace = get_num_vertices_of_face;
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mIface.m_getNormal = get_normal;
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mIface.m_getPosition = get_position;
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mIface.m_getTexCoord = get_tex_coords;
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mIface.m_setTSpaceBasic = set_tspace_basic;
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mContext.m_pInterface = &mIface;
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for (size_t i=0; i<pScene->mNumMeshes; ++i) {
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aiMesh *mesh = pScene->mMeshes[i];
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ExecutePerMesh(mesh);
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}
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}
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void GenerateMikkTSpaceTangents::SetupProperties(const Importer *pImp) {
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mActive = pImp->GetPropertyBool(AI_CONFIG_POSTPROCESS_USE_MIKKTSPACE_TANGENTS, false);
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}
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void GenerateMikkTSpaceTangents::ExecutePerMesh(aiMesh *mesh) {
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if (mesh == nullptr) {
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return;
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}
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mContext.m_pUserData = mesh;
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genTangSpaceDefault(&mContext);
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}
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} // namespace Assimp
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