psxm.hh

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/*
 
MIT License
 
Copyright (c) 2026 PCSX-Redux authors
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
 
*/
 
#pragma once
 
#include <stdint.h>
 
namespace psxm {
 
struct Header {
    char magic[4];  
    uint16_t vertexCount;
    uint16_t normalCount;
    uint16_t triangleCount;
    uint16_t reserved;  
    uint32_t vertexOffset;
    uint32_t normalOffset;
    uint32_t triangleOffset;
};
static_assert(sizeof(Header) == 24, "PXM2 header size mismatch");
 
struct Vec3 {
    int16_t x, y, z;
};
static_assert(sizeof(Vec3) == 6, "PXM2 vector size mismatch");
 
struct UV {
    uint8_t u, v;
};
 
struct Triangle {
    uint16_t vertices[3];
    uint16_t normals[3];
    UV uv[3];
    uint16_t padding;  
};
static_assert(sizeof(Triangle) == 20, "PXM2 triangle size mismatch");
 
class Model {
  public:
    bool parse(const uint8_t* blob) {
        auto header = reinterpret_cast<const Header*>(blob);
        if (header->magic[0] != 'P' || header->magic[1] != 'X' || header->magic[2] != 'M' || header->magic[3] != '2') {
            return false;
        }
        m_header = header;
        m_vertices = reinterpret_cast<const Vec3*>(blob + header->vertexOffset);
        m_normals = reinterpret_cast<const Vec3*>(blob + header->normalOffset);
        m_triangles = reinterpret_cast<const Triangle*>(blob + header->triangleOffset);
        return true;
    }
 
    unsigned vertexCount() const { return m_header->vertexCount; }
    unsigned normalCount() const { return m_header->normalCount; }
    unsigned triangleCount() const { return m_header->triangleCount; }
 
    const Vec3* vertices() const { return m_vertices; }
    const Vec3* normals() const { return m_normals; }
    const Triangle* triangles() const { return m_triangles; }
 
  private:
    const Header* m_header = nullptr;
    const Vec3* m_vertices = nullptr;
    const Vec3* m_normals = nullptr;
    const Triangle* m_triangles = nullptr;
};
 
}  // namespace psxm