UPBGE: Implement Moto function to generate frustum box.

The new function MT_FrustumBox in MT_Frustum is used to generate the
8 vertices of a box using the combinaison of the projection and
modelview matrix of a camera.

intern/moto/CMakeLists.txt

@@ -34,6 +34,7 @@ set(INC_SYS
 
 set(SRC
 	intern/MT_CmMatrix4x4.cpp
+	intern/MT_Frustum.cpp
 	intern/MT_Matrix3x3.cpp
 	intern/MT_Matrix4x4.cpp
 	intern/MT_Quaternion.cpp
@@ -44,6 +45,7 @@ set(SRC
 	intern/MT_random.cpp
 
 	include/MT_CmMatrix4x4.h
+	include/MT_Frustum.h
 	include/MT_Matrix3x3.h
 	include/MT_Matrix4x4.h
 	include/MT_MinMax.h
@@ -57,6 +59,7 @@ set(SRC
 	include/MT_Vector4.h
 	include/MT_random.h
 
+	include/MT_Frustum.inl
 	include/MT_Matrix3x3.inl
 	include/MT_Matrix4x4.inl
 	include/MT_Quaternion.inl

intern/moto/include/MT_Frustum.h

@@ -0,0 +1,35 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Tristan Porteries.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file moto/include/MT_Frustum.h
+ *  \ingroup moto
+ */
+
+#include "MT_Matrix4x4.h"
+
+#include <array>
+
+void MT_FrustumBox(const MT_Matrix4x4& mat, std::array<MT_Vector3, 8>& box);
+
+#ifdef GEN_INLINED
+#  include "MT_Frustum.inl"
+#endif

intern/moto/include/MT_Frustum.inl

@@ -0,0 +1,48 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Tristan Porteries.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file moto/include/MT_Frustum.inl
+ *  \ingroup moto
+ */
+
+#include "MT_Optimize.h"
+
+GEN_INLINE void MT_FrustumBox(const MT_Matrix4x4& mat, std::array<MT_Vector3, 8>& box)
+{
+	static const MT_Vector3 normalizedBox[8] = {
+		MT_Vector3(-1.0f, -1.0f, -1.0f),
+		MT_Vector3(-1.0f, 1.0f, -1.0f),
+		MT_Vector3(1.0f, 1.0f, -1.0f),
+		MT_Vector3(1.0f, -1.0f, -1.0f),
+		MT_Vector3(-1.0f, -1.0f, 1.0f),
+		MT_Vector3(-1.0f, 1.0f, 1.0f),
+		MT_Vector3(1.0f, 1.0f, 1.0f),
+		MT_Vector3(1.0f, -1.0f, 1.0f)
+	};
+
+	for (unsigned short i = 0; i < 8; ++i) {
+		const MT_Vector3& p3 = normalizedBox[i];
+		const MT_Vector4 p4 = mat * MT_Vector4(p3.x(), p3.y(), p3.z(), 1.0f);
+
+		box[i] = p4.to3d() / p4.w();
+	}
+}

intern/moto/intern/MT_Frustum.cpp

@@ -0,0 +1,32 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program 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.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): Tristan Porteries.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file moto/include/MT_Frustum.cpp
+ *  \ingroup moto
+ */
+
+
+#include "MT_Frustum.h"
+
+#ifndef GEN_INLINED
+#  include "MT_Frustum.inl"
+#endif

source/gameengine/Rasterizer/RAS_DebugDraw.cpp

@@ -27,6 +27,8 @@
 #include "RAS_DebugDraw.h"
 #include "RAS_OpenGLDebugDraw.h"
 
+#include "MT_Frustum.h"
+
 RAS_DebugDraw::Shape::Shape(const MT_Vector4& color)
 	:m_color(color)
 {
@@ -118,37 +120,12 @@ void RAS_DebugDraw::DrawSolidBox(const std::array<MT_Vector3, 8>& vertices, cons
 void RAS_DebugDraw::DrawCameraFrustum(const MT_Matrix4x4& projmat, const MT_Matrix4x4& viewmat)
 {
 	std::array<MT_Vector3, 8> box;
-
-	box[0][0] = box[1][0] = box[4][0] = box[5][0] = -1.0f;
-	box[2][0] = box[3][0] = box[6][0] = box[7][0] = 1.0f;
-	box[0][1] = box[3][1] = box[4][1] = box[7][1] = -1.0f;
-	box[1][1] = box[2][1] = box[5][1] = box[6][1] = 1.0f;
-	box[0][2] = box[1][2] = box[2][2] = box[3][2] = -1.0f;
-	box[4][2] = box[5][2] = box[6][2] = box[7][2] = 1.0f;
-
-	const MT_Matrix4x4 mv = (projmat * viewmat).inverse();
-
-	for (MT_Vector3& p3 : box) {
-		const MT_Vector4 p4 = mv * MT_Vector4(p3.x(), p3.y(), p3.z(), 1.0f);
-		p3 = MT_Vector3(p4.x() / p4.w(), p4.y() / p4.w(), p4.z() / p4.w());
-	}
+	MT_FrustumBox((projmat * viewmat).inverse(), box);
 
 	DrawSolidBox(box, MT_Vector4(0.4f, 0.4f, 0.4f, 0.4f), MT_Vector4(0.0f, 0.0f, 0.0f, 0.4f),
 		MT_Vector4(0.8f, 0.5f, 0.0f, 1.0f));
 }
 
-/*void RAS_DebugDraw::DisableForText()
-{
-	SetAlphaBlend(GPU_BLEND_ALPHA);
-	SetLines(false); // needed for texture fonts otherwise they render as wireframe
-
-	Enable(RAS_CULL_FACE);
-
-	ProcessLighting(false, MT_Transform::Identity());
-
-	m_impl->DisableForText();
-}*/
-
 void RAS_DebugDraw::RenderBox2D(const MT_Vector2& pos, const MT_Vector2& size, const MT_Vector4& color)
 {
 	m_boxes2D.emplace_back(pos, size, color);