Method CopyVertices

engine/PoseidonGL33/EngineGL33_VertexBuffer.cpp:72–109

}

void VertexBufferGL33::CopyVertices(const Shape& src)
{
    if (_vertexCount <= 0)
        return;

    glBindBuffer(GL_ARRAY_BUFFER, _vbo);
    // The map-flag combination is selected by the named helper.  There
    // is no API exposed by `Poseidon::render::buf` that maps a static buffer with
    // INVALIDATE (B-028) or a dynamic buffer without it — picking the
    // wrong helper is the only way to land in the bug class, and the
    // helper name makes the mistake glaring.  See
    // `engine/Poseidon/Graphics/Core/GLBufferMap.hpp`.
    void* mapped = _dynamic ? Poseidon::render::buf::MapDynamicWriteInvalidate(GL_ARRAY_BUFFER, 0, _vertexCount * sizeof(SVertex))
                            : Poseidon::render::buf::MapStaticWriteOnce(GL_ARRAY_BUFFER);
    SVertex* sData = static_cast<SVertex*>(mapped);
    if (!sData)
    {
        LOG_ERROR(Graphics, "GL33: VBO map failed");
        return;
    }

    const UVPair* uv = &src.UV(0);
    const Vector3* pos = &src.Pos(0);
    const Vector3* norm = &src.Norm(0);
    for (int i = src.NVertex(); --i >= 0;)
    {
        sData->pos = Vector3P(pos->X(), pos->Y(), pos->Z());
        // Normals are negated (matches D3D11 convention)
        sData->norm = Vector3P(-norm->X(), -norm->Y(), -norm->Z());
        pos++;
        norm++;
        sData->t0 = *uv;
        uv++;
        sData++;
    }

    glUnmapBuffer(GL_ARRAY_BUFFER);
}

bool VertexBufferGL33::Init(const Shape& src, VBType type)
{