The GtkRadiant sources as originally released under the GPL license.

radiant/brush_primit.h

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+/*
+Copyright (C) 1999-2006 Id Software, Inc. and contributors.
+For a list of contributors, see the accompanying CONTRIBUTORS file.
+
+This file is part of GtkRadiant.
+
+GtkRadiant is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+GtkRadiant is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GtkRadiant; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#if !defined(INCLUDED_BRUSH_PRIMIT_H)
+#define INCLUDED_BRUSH_PRIMIT_H
+
+#include "math/vector.h"
+#include "itexdef.h"
+// Timo
+// new brush primitive texdef
+struct brushprimit_texdef_t
+{
+  brushprimit_texdef_t()
+  {
+    coords[0][0] = 2.0f;
+    coords[0][1] = 0.f;
+    coords[0][2] = 0.f;
+    coords[1][0] = 0.f;
+    coords[1][1] = 2.0f;
+    coords[1][2] = 0.f;
+  }
+  void removeScale(std::size_t width, std::size_t height)
+  {
+#if 1
+    coords[0][0] *= width;
+    coords[0][1] *= width;
+    coords[0][2] *= width;
+    coords[1][0] *= height;
+    coords[1][1] *= height;
+    coords[1][2] *= height;
+#endif
+  }
+  void addScale(std::size_t width, std::size_t height)
+  {
+#if 1
+    coords[0][0] /= width;
+    coords[0][1] /= width;
+    coords[0][2] /= width;
+    coords[1][0] /= height;
+    coords[1][1] /= height;
+    coords[1][2] /= height;
+#endif
+  }
+	float coords[2][3];
+};
+
+class TextureProjection
+{
+public:
+	texdef_t m_texdef;
+	brushprimit_texdef_t m_brushprimit_texdef;
+  Vector3 m_basis_s;
+  Vector3 m_basis_t;
+
+  TextureProjection()
+  {
+  }
+  TextureProjection(
+    const texdef_t& texdef,
+    const brushprimit_texdef_t& brushprimit_texdef,
+    const Vector3& basis_s,
+    const Vector3& basis_t
+  ) :
+    m_texdef(texdef),
+    m_brushprimit_texdef(brushprimit_texdef),
+    m_basis_s(basis_s),
+    m_basis_t(basis_t)
+  {
+  }
+};
+
+float Texdef_getDefaultTextureScale();
+
+class texdef_t;
+struct Winding;
+template<typename Element> class BasicVector3;
+typedef BasicVector3<float> Vector3;
+template<typename Element> class BasicVector4;
+typedef BasicVector4<float> Vector4;
+typedef Vector4 Quaternion;
+class Matrix4;
+class Plane3;
+
+void Normal_GetTransform(const Vector3& normal, Matrix4& transform);
+
+void TexDef_Construct_Default(TextureProjection& projection);
+
+void Texdef_Assign(TextureProjection& projection, const TextureProjection& other);
+void Texdef_Shift(TextureProjection& projection, float s, float t);
+void Texdef_Scale(TextureProjection& projection, float s, float t);
+void Texdef_Rotate(TextureProjection& projection, float angle);
+void Texdef_FitTexture(TextureProjection& projection, std::size_t width, std::size_t height, const Vector3& normal, const Winding& w, float s_repeat, float t_repeat);
+void Texdef_EmitTextureCoordinates(const TextureProjection& projection, std::size_t width, std::size_t height, Winding& w, const Vector3& normal, const Matrix4& localToWorld);
+
+void ShiftScaleRotate_fromFace(texdef_t& shiftScaleRotate, const TextureProjection& projection);
+void ShiftScaleRotate_toFace(const texdef_t& shiftScaleRotate, TextureProjection& projection);
+
+void Texdef_transformLocked(TextureProjection& projection, std::size_t width, std::size_t height, const Plane3& plane, const Matrix4& transform);
+void Texdef_normalise(TextureProjection& projection, float width, float height);
+
+enum TexdefTypeId
+{
+  TEXDEFTYPEID_QUAKE,
+  TEXDEFTYPEID_BRUSHPRIMITIVES,
+  TEXDEFTYPEID_HALFLIFE,
+};
+
+struct bp_globals_t
+{
+  // tells if we are internally using brush primitive (texture coordinates and map format)
+  // this is a shortcut for IntForKey( g_qeglobals.d_project_entity, "brush_primit" )
+  // NOTE: must keep the two ones in sync
+  TexdefTypeId m_texdefTypeId;
+};
+
+extern bp_globals_t g_bp_globals;
+extern float g_texdef_default_scale;
+
+#endif