1 files changed, 248 insertions, 0 deletions
diff --git a/src/renderergl2/tr_extramath.cpp b/src/renderergl2/tr_extramath.cpp
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+++ b/src/renderergl2/tr_extramath.cpp
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+/*
+===========================================================================
+Copyright (C) 2010 James Canete (use.less01@gmail.com)
+Copyright (C) 2015-2019 GrangerHub
+
+This file is part of Tremulous.
+
+Tremulous 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 3 of the License,
+or (at your option) any later version.
+
+Tremulous 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 Tremulous; if not, see <https://www.gnu.org/licenses/>
+
+===========================================================================
+*/
+// tr_extramath.c - extra math needed by the renderer not in qmath.c
+
+#include "tr_local.h"
+
+// Some matrix helper functions
+// FIXME: do these already exist in ioq3 and I don't know about them?
+
+void Mat4Zero( mat4_t out )
+{
+	out[ 0] = 0.0f; out[ 4] = 0.0f; out[ 8] = 0.0f; out[12] = 0.0f;
+	out[ 1] = 0.0f; out[ 5] = 0.0f; out[ 9] = 0.0f; out[13] = 0.0f;
+	out[ 2] = 0.0f; out[ 6] = 0.0f; out[10] = 0.0f; out[14] = 0.0f;
+	out[ 3] = 0.0f; out[ 7] = 0.0f; out[11] = 0.0f; out[15] = 0.0f;
+}
+
+void Mat4Identity( mat4_t out )
+{
+	out[ 0] = 1.0f; out[ 4] = 0.0f; out[ 8] = 0.0f; out[12] = 0.0f;
+	out[ 1] = 0.0f; out[ 5] = 1.0f; out[ 9] = 0.0f; out[13] = 0.0f;
+	out[ 2] = 0.0f; out[ 6] = 0.0f; out[10] = 1.0f; out[14] = 0.0f;
+	out[ 3] = 0.0f; out[ 7] = 0.0f; out[11] = 0.0f; out[15] = 1.0f;
+}
+
+void Mat4Copy( const mat4_t in, mat4_t out )
+{
+	out[ 0] = in[ 0]; out[ 4] = in[ 4]; out[ 8] = in[ 8]; out[12] = in[12]; 
+	out[ 1] = in[ 1]; out[ 5] = in[ 5]; out[ 9] = in[ 9]; out[13] = in[13]; 
+	out[ 2] = in[ 2]; out[ 6] = in[ 6]; out[10] = in[10]; out[14] = in[14]; 
+	out[ 3] = in[ 3]; out[ 7] = in[ 7]; out[11] = in[11]; out[15] = in[15]; 
+}
+
+void Mat4Multiply( const mat4_t in1, const mat4_t in2, mat4_t out )
+{
+	out[ 0] = in1[ 0] * in2[ 0] + in1[ 4] * in2[ 1] + in1[ 8] * in2[ 2] + in1[12] * in2[ 3];
+	out[ 1] = in1[ 1] * in2[ 0] + in1[ 5] * in2[ 1] + in1[ 9] * in2[ 2] + in1[13] * in2[ 3];
+	out[ 2] = in1[ 2] * in2[ 0] + in1[ 6] * in2[ 1] + in1[10] * in2[ 2] + in1[14] * in2[ 3];
+	out[ 3] = in1[ 3] * in2[ 0] + in1[ 7] * in2[ 1] + in1[11] * in2[ 2] + in1[15] * in2[ 3];
+
+	out[ 4] = in1[ 0] * in2[ 4] + in1[ 4] * in2[ 5] + in1[ 8] * in2[ 6] + in1[12] * in2[ 7];
+	out[ 5] = in1[ 1] * in2[ 4] + in1[ 5] * in2[ 5] + in1[ 9] * in2[ 6] + in1[13] * in2[ 7];
+	out[ 6] = in1[ 2] * in2[ 4] + in1[ 6] * in2[ 5] + in1[10] * in2[ 6] + in1[14] * in2[ 7];
+	out[ 7] = in1[ 3] * in2[ 4] + in1[ 7] * in2[ 5] + in1[11] * in2[ 6] + in1[15] * in2[ 7];
+
+	out[ 8] = in1[ 0] * in2[ 8] + in1[ 4] * in2[ 9] + in1[ 8] * in2[10] + in1[12] * in2[11];
+	out[ 9] = in1[ 1] * in2[ 8] + in1[ 5] * in2[ 9] + in1[ 9] * in2[10] + in1[13] * in2[11];
+	out[10] = in1[ 2] * in2[ 8] + in1[ 6] * in2[ 9] + in1[10] * in2[10] + in1[14] * in2[11];
+	out[11] = in1[ 3] * in2[ 8] + in1[ 7] * in2[ 9] + in1[11] * in2[10] + in1[15] * in2[11];
+
+	out[12] = in1[ 0] * in2[12] + in1[ 4] * in2[13] + in1[ 8] * in2[14] + in1[12] * in2[15];
+	out[13] = in1[ 1] * in2[12] + in1[ 5] * in2[13] + in1[ 9] * in2[14] + in1[13] * in2[15];
+	out[14] = in1[ 2] * in2[12] + in1[ 6] * in2[13] + in1[10] * in2[14] + in1[14] * in2[15];
+	out[15] = in1[ 3] * in2[12] + in1[ 7] * in2[13] + in1[11] * in2[14] + in1[15] * in2[15];
+}
+
+void Mat4Transform( const mat4_t in1, const vec4_t in2, vec4_t out )
+{
+	out[ 0] = in1[ 0] * in2[ 0] + in1[ 4] * in2[ 1] + in1[ 8] * in2[ 2] + in1[12] * in2[ 3];
+	out[ 1] = in1[ 1] * in2[ 0] + in1[ 5] * in2[ 1] + in1[ 9] * in2[ 2] + in1[13] * in2[ 3];
+	out[ 2] = in1[ 2] * in2[ 0] + in1[ 6] * in2[ 1] + in1[10] * in2[ 2] + in1[14] * in2[ 3];
+	out[ 3] = in1[ 3] * in2[ 0] + in1[ 7] * in2[ 1] + in1[11] * in2[ 2] + in1[15] * in2[ 3];
+}
+
+bool Mat4Compare( const mat4_t a, const mat4_t b )
+{
+	return !(a[ 0] != b[ 0] || a[ 4] != b[ 4] || a[ 8] != b[ 8] || a[12] != b[12] ||
+             a[ 1] != b[ 1] || a[ 5] != b[ 5] || a[ 9] != b[ 9] || a[13] != b[13] ||
+		     a[ 2] != b[ 2] || a[ 6] != b[ 6] || a[10] != b[10] || a[14] != b[14] ||
+		     a[ 3] != b[ 3] || a[ 7] != b[ 7] || a[11] != b[11] || a[15] != b[15]);
+}
+
+void Mat4Dump( const mat4_t in )
+{
+	ri.Printf(PRINT_ALL, "%3.5f %3.5f %3.5f %3.5f\n", in[ 0], in[ 4], in[ 8], in[12]);
+	ri.Printf(PRINT_ALL, "%3.5f %3.5f %3.5f %3.5f\n", in[ 1], in[ 5], in[ 9], in[13]);
+	ri.Printf(PRINT_ALL, "%3.5f %3.5f %3.5f %3.5f\n", in[ 2], in[ 6], in[10], in[14]);
+	ri.Printf(PRINT_ALL, "%3.5f %3.5f %3.5f %3.5f\n", in[ 3], in[ 7], in[11], in[15]);
+}
+
+void Mat4Translation( vec3_t vec, mat4_t out )
+{
+	out[ 0] = 1.0f; out[ 4] = 0.0f; out[ 8] = 0.0f; out[12] = vec[0];
+	out[ 1] = 0.0f; out[ 5] = 1.0f; out[ 9] = 0.0f; out[13] = vec[1];
+	out[ 2] = 0.0f; out[ 6] = 0.0f; out[10] = 1.0f; out[14] = vec[2];
+	out[ 3] = 0.0f; out[ 7] = 0.0f; out[11] = 0.0f; out[15] = 1.0f;
+}
+
+void Mat4Ortho( float left, float right, float bottom, float top, float znear, float zfar, mat4_t out )
+{
+	out[ 0] = 2.0f / (right - left); out[ 4] = 0.0f;                  out[ 8] = 0.0f;                  out[12] = -(right + left) / (right - left);
+	out[ 1] = 0.0f;                  out[ 5] = 2.0f / (top - bottom); out[ 9] = 0.0f;                  out[13] = -(top + bottom) / (top - bottom);
+	out[ 2] = 0.0f;                  out[ 6] = 0.0f;                  out[10] = 2.0f / (zfar - znear); out[14] = -(zfar + znear) / (zfar - znear);
+	out[ 3] = 0.0f;                  out[ 7] = 0.0f;                  out[11] = 0.0f;                  out[15] = 1.0f;
+}
+
+void Mat4View(vec3_t axes[3], vec3_t origin, mat4_t out)
+{
+	out[0]  = axes[0][0];
+	out[1]  = axes[1][0];
+	out[2]  = axes[2][0];
+	out[3]  = 0;
+
+	out[4]  = axes[0][1];
+	out[5]  = axes[1][1];
+	out[6]  = axes[2][1];
+	out[7]  = 0;
+
+	out[8]  = axes[0][2];
+	out[9]  = axes[1][2];
+	out[10] = axes[2][2];
+	out[11] = 0;
+
+	out[12] = -DotProduct(origin, axes[0]);
+	out[13] = -DotProduct(origin, axes[1]);
+	out[14] = -DotProduct(origin, axes[2]);
+	out[15] = 1;
+}
+
+void Mat4SimpleInverse( const mat4_t in, mat4_t out)
+{
+	vec3_t v;
+	float invSqrLen;
+ 
+	VectorCopy(in + 0, v);
+	invSqrLen = 1.0f / DotProduct(v, v); VectorScale(v, invSqrLen, v);
+	out[ 0] = v[0]; out[ 4] = v[1]; out[ 8] = v[2]; out[12] = -DotProduct(v, &in[12]);
+
+	VectorCopy(in + 4, v);
+	invSqrLen = 1.0f / DotProduct(v, v); VectorScale(v, invSqrLen, v);
+	out[ 1] = v[0]; out[ 5] = v[1]; out[ 9] = v[2]; out[13] = -DotProduct(v, &in[12]);
+
+	VectorCopy(in + 8, v);
+	invSqrLen = 1.0f / DotProduct(v, v); VectorScale(v, invSqrLen, v);
+	out[ 2] = v[0]; out[ 6] = v[1]; out[10] = v[2]; out[14] = -DotProduct(v, &in[12]);
+
+	out[ 3] = 0.0f; out[ 7] = 0.0f; out[11] = 0.0f; out[15] = 1.0f;
+}
+
+void VectorLerp( vec3_t a, vec3_t b, float lerp, vec3_t c)
+{
+	c[0] = a[0] * (1.0f - lerp) + b[0] * lerp;
+	c[1] = a[1] * (1.0f - lerp) + b[1] * lerp;
+	c[2] = a[2] * (1.0f - lerp) + b[2] * lerp;
+}
+
+bool SpheresIntersect(vec3_t origin1, float radius1, vec3_t origin2, float radius2)
+{
+	float radiusSum = radius1 + radius2;
+	vec3_t diff;
+	
+	VectorSubtract(origin1, origin2, diff);
+
+	if (DotProduct(diff, diff) <= radiusSum * radiusSum)
+	{
+		return true;
+	}
+
+	return false;
+}
+
+void BoundingSphereOfSpheres(vec3_t origin1, float radius1, vec3_t origin2, float radius2, vec3_t origin3, float *radius3)
+{
+	vec3_t diff;
+
+	VectorScale(origin1, 0.5f, origin3);
+	VectorMA(origin3, 0.5f, origin2, origin3);
+
+	VectorSubtract(origin1, origin2, diff);
+	*radius3 = VectorLength(diff) * 0.5f + MAX(radius1, radius2);
+}
+
+int NextPowerOfTwo(int in)
+{
+	int out;
+
+	for (out = 1; out < in; out <<= 1)
+		;
+
+	return out;
+}
+
+union f32_u {
+	float f;
+	uint32_t ui;
+	struct {
+		unsigned int fraction:23;
+		unsigned int exponent:8;
+		unsigned int sign:1;
+	} pack;
+};
+
+union f16_u {
+	uint16_t ui;
+	struct {
+		unsigned int fraction:10;
+		unsigned int exponent:5;
+		unsigned int sign:1;
+	} pack;
+};
+
+uint16_t FloatToHalf(float in)
+{
+	union f32_u f32;
+	union f16_u f16;
+
+	f32.f = in;
+
+	f16.pack.exponent = CLAMP((int)(f32.pack.exponent) - 112, 0, 31);
+	f16.pack.fraction = f32.pack.fraction >> 13;
+	f16.pack.sign     = f32.pack.sign;
+
+	return f16.ui;
+}
+
+float HalfToFloat(uint16_t in)
+{
+	union f32_u f32;
+	union f16_u f16;
+
+	f16.ui = in;
+
+	f32.pack.exponent = (int)(f16.pack.exponent) + 112;
+	f32.pack.fraction = f16.pack.fraction << 13;
+	f32.pack.sign = f16.pack.sign;
+
+	return f32.f;
+}