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Onek8
2025-01-22 16:18:30 +01:00
parent ed4603cf95
commit a36294b518
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84
Kha/Backends/Kinc-HL/hl/libs/fmt/mikkt.c Normal file
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#define HL_NAME(n) fmt_##n
#include <mikktspace.h>
#include <hl.h>
typedef struct {
hl_type *t;
float *buffer;
int stride;
int xpos;
int normalPos;
int uvPos;
float *tangents;
int tangentsStride;
int tangentPos;
int *indexes;
int indices;
} user_info;
typedef const SMikkTSpaceContext Mikkt;
static int get_num_faces( Mikkt *ctx ) {
user_info *i = (user_info*)ctx->m_pUserData;
return i->indices / 3;
}
static int get_num_vertices( Mikkt *ctx, int face ) {
return 3;
}
static void get_position( Mikkt *ctx, float fvPosOut[], const int iFace, const int iVert ) {
user_info *i = (user_info*)ctx->m_pUserData;
int idx = iFace * 3 + iVert;
int v = i->indexes[idx];
int p = v * i->stride + i->xpos;
fvPosOut[0] = i->buffer[p++];
fvPosOut[1] = i->buffer[p++];
fvPosOut[2] = i->buffer[p++];
}
static void get_normal( Mikkt *ctx, float fvPosOut[], const int iFace, const int iVert ) {
user_info *i = (user_info*)ctx->m_pUserData;
int idx = iFace * 3 + iVert;
int v = i->indexes[idx];
int p = v * i->stride + i->normalPos;
fvPosOut[0] = i->buffer[p++];
fvPosOut[1] = i->buffer[p++];
fvPosOut[2] = i->buffer[p++];
}
static void get_tcoord( Mikkt *ctx, float fvPosOut[], const int iFace, const int iVert ) {
user_info *i = (user_info*)ctx->m_pUserData;
int idx = iFace * 3 + iVert;
int v = i->indexes[idx];
int p = v * i->stride + i->uvPos;
fvPosOut[0] = i->buffer[p++];
fvPosOut[1] = i->buffer[p++];
}
static void set_tangent( Mikkt *ctx, const float fvTangent[], const float fSign, const int iFace, const int iVert ) {
user_info *i = (user_info*)ctx->m_pUserData;
int idx = iFace * 3 + iVert;
int p = idx * i->tangentsStride + i->tangentPos;
i->tangents[p++] = fvTangent[0];
i->tangents[p++] = fvTangent[1];
i->tangents[p++] = fvTangent[2];
i->tangents[p++] = fSign;
}
HL_PRIM bool HL_NAME(compute_mikkt_tangents)( user_info *inf, double threshold ) {
SMikkTSpaceContext ctx;
SMikkTSpaceInterface intf;
intf.m_getNumFaces = get_num_faces;
intf.m_getNumVerticesOfFace = get_num_vertices;
intf.m_getPosition = get_position;
intf.m_getNormal = get_normal;
intf.m_getTexCoord = get_tcoord;
intf.m_setTSpaceBasic = set_tangent;
intf.m_setTSpace = NULL;
ctx.m_pInterface = &intf;
ctx.m_pUserData = inf;
return genTangSpace(&ctx, (float)threshold);
}
DEFINE_PRIM(_BOOL, compute_mikkt_tangents, _DYN _F64);