fast functions of common math (untested!)

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.24)
-project(BLT VERSION 0.5.0)
+project(BLT VERSION 0.5.1)
 
 set(CMAKE_CXX_STANDARD 17)
 

cmake-build-release/CMakeCache.txt

@@ -181,7 +181,7 @@ CMAKE_PROJECT_HOMEPAGE_URL:STATIC=
 CMAKE_PROJECT_NAME:STATIC=BLT_TESTS
 
 //Value Computed by CMake
-CMAKE_PROJECT_VERSION:STATIC=0.5.0
+CMAKE_PROJECT_VERSION:STATIC=0.5.1
 
 //Value Computed by CMake
 CMAKE_PROJECT_VERSION_MAJOR:STATIC=0
@@ -190,7 +190,7 @@ CMAKE_PROJECT_VERSION_MAJOR:STATIC=0
 CMAKE_PROJECT_VERSION_MINOR:STATIC=5
 
 //Value Computed by CMake
-CMAKE_PROJECT_VERSION_PATCH:STATIC=0
+CMAKE_PROJECT_VERSION_PATCH:STATIC=1
 
 //Value Computed by CMake
 CMAKE_PROJECT_VERSION_TWEAK:STATIC=

cmake-build-release/CMakeFiles/clion-Release-log.txt

@@ -3,7 +3,7 @@ Standard Files /home/brett/Documents/code/c++/BLT/src/blt/std/filesystem.cpp;/ho
 Profiler Files /home/brett/Documents/code/c++/BLT/src/blt/profiling/profiler.cpp
 Source: /home/brett/Documents/code/c++/BLT
 Current Source: /home/brett/Documents/code/c++/BLT
-BLT 0.5.0 Successfully included!
+BLT 0.5.1 Successfully included!
 BLT tests included!
 -- Configuring done
 -- Generating done

include/blt/math/math.h

@@ -11,6 +11,30 @@
 #include <blt/math/matrix.h>
 
 namespace blt {
+
+    /**
+     * fast number integer
+     */
+    unsigned int f_randi(unsigned int seed) {
+        seed = (seed << 13) ^ seed;
+        return ((seed * (seed * seed * 15731 + 789221) + 1376312589) & 0x7fffffff);
+    }
+    
+    /**
+     * fast inverse sqrt
+     */
+    float fsqrt(float n){
+        int i;
+        float x, y;
+        x = n * 0.5f;
+        y = n;
+        i = * (int*) &y;
+        i = 0x5f3759df - (i >> 1);
+        y = * (float*) &i;
+        y = y * (1.5f - (x * y * y));
+        y = y * (1.5f - (x * y * y));
+        return y;
+    }
     
 //    inline std::ostream& operator<<(std::ostream& out, const mat4x4& v) {
 //        return out << "\rMatrix4x4{" << v.m00() << ", " << v.m01() << ", " << v.m02() << ", " << v.m03() << "} \n"\

include/blt/math/matrix.h

@@ -262,6 +262,7 @@ namespace blt {
     
     // https://www.scratchapixel.com/lessons/3d-basic-rendering/perspective-and-orthographic-projection-matrix/building-basic-perspective-projection-matrix.html
     // https://ogldev.org/www/tutorial12/tutorial12.html
+    // http://www.songho.ca/opengl/gl_projectionmatrix.html
     static inline mat4x4 perspective(float fov, float aspect_ratio, float near, float far){
         mat4x4 perspectiveMat4x4 {emptyMatrix};