refactor(math_tools): convert free functions to inline in header

include/Cubed/tools/math_tools.hpp

@@ -1,18 +1,103 @@
 #pragma once
+#include <algorithm>
 #include <glm/glm.hpp>
-
+#include <glm/gtc/type_ptr.hpp>
 namespace Cubed {
 
 namespace Math {
 
-void extract_frustum_planes(const glm::mat4& mvp_matrix,
-                            std::vector<glm::vec4>& planes);
+inline void extract_frustum_planes(const glm::mat4& mvp_matrix,
+                                   std::vector<glm::vec4>& planes) {
+    if (planes.size() != 6) {
+        planes.resize(6);
+    }
 
-float smootherstep(float edge0, float edge1, float x);
-bool is_aabb_in_frustum(const glm::vec3& center, const glm::vec3& half_extents,
-                        const std::vector<glm::vec4>& planes);
-float deterministic_random(int x, int z, uint64_t seed);
-glm::vec3 slerp(const glm::vec3& from, const glm::vec3& to, float t);
+    const float* m = glm::value_ptr(mvp_matrix);
+
+    // left plane
+    planes[0] =
+        glm::vec4(m[3] + m[0], m[7] + m[4], m[11] + m[8], m[15] + m[12]);
+    // right plane
+    planes[1] =
+        glm::vec4(m[3] - m[0], m[7] - m[4], m[11] - m[8], m[15] - m[12]);
+    // bottom plane
+    planes[2] =
+        glm::vec4(m[3] + m[1], m[7] + m[5], m[11] + m[9], m[15] + m[13]);
+    // top plane
+    planes[3] =
+        glm::vec4(m[3] - m[1], m[7] - m[5], m[11] - m[9], m[15] - m[13]);
+    // near plane
+    planes[4] =
+        glm::vec4(m[3] + m[2], m[7] + m[6], m[11] + m[10], m[15] + m[14]);
+    // far plane
+    planes[5] =
+        glm::vec4(m[3] - m[2], m[7] - m[6], m[11] - m[10], m[15] - m[14]);
+
+    for (auto& p : planes) {
+        p = glm::normalize(p);
+    }
+}
+
+inline float smootherstep(float edge0, float edge1, float x) {
+
+    x = std::clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
+
+    return x * x * x * (x * (6.0f * x - 15.0f) + 10.0f);
+}
+
+inline bool is_aabb_in_frustum(const glm::vec3& center,
+                               const glm::vec3& half_extents,
+                               const std::vector<glm::vec4>& planes) {
+    for (const auto& plane : planes) {
+        // distance
+        float d = glm::dot(glm::vec3(plane), center) + plane.w;
+        float r = half_extents.x * std::abs(plane.x) +
+                  half_extents.y * std::abs(plane.y) +
+                  half_extents.z * std::abs(plane.z);
+        if (d + r < 0) {
+            return false;
+        }
+    }
+    return true;
+}
+inline float deterministic_random(int x, int z, uint64_t seed) {
+    uint64_t h = seed;
+    h = h * 6364136223846793005ULL + (uint64_t)x;
+    h = h * 6364136223846793005ULL + (uint64_t)z;
+    return (float)(h >> 40) / (float)(1 << 24);
+}
+
+inline glm::vec3 slerp(const glm::vec3& from, const glm::vec3& to, float t) {
+
+    float cos_theta = glm::clamp(glm::dot(from, to), -1.0f, 1.0f);
+
+    if (cos_theta > 0.9995f) {
+        return glm::normalize(glm::mix(from, to, t));
+    }
+
+    if (cos_theta < -0.9995f) {
+
+        glm::vec3 axis = (std::fabs(from.x) < 0.9f)
+                             ? glm::vec3(1.0f, 0.0f, 0.0f)
+                             : glm::vec3(0.0f, 1.0f, 0.0f);
+        glm::vec3 ortho = glm::normalize(glm::cross(from, axis));
+
+        float angle = glm::pi<float>() * t;
+
+        glm::vec3 rotated =
+            from * std::cos(angle) + glm::cross(ortho, from) * std::sin(angle);
+
+        return glm::normalize(rotated);
+    }
+
+    float theta = std::acos(cos_theta);
+    float sin_theta = std::sin(theta);
+
+    float a = std::sin((1.0f - t) * theta) / sin_theta;
+    float b = std::sin(t * theta) / sin_theta;
+
+    return glm::normalize(a * from + b * to);
+}
 
 inline float distance2(const glm::vec3& a, const glm::vec3& b) {
     glm::vec3 diff = a - b;

src/CMakeLists.txt

@@ -15,7 +15,6 @@ target_sources(${PROJECT_NAME}
         shader.cpp
         texture_manager.cpp
         tools/cubed_random.cpp
-        tools/math_tools.cpp
         tools/shader_tools.cpp
         tools/font.cpp
         tools/perlin_noise.cpp

src/tools/math_tools.cpp

@@ -1,105 +0,0 @@
-#include "Cubed/tools/math_tools.hpp"
-
-#include <algorithm>
-#include <glm/glm.hpp>
-#include <glm/gtc/type_ptr.hpp>
-
-namespace Cubed {
-
-namespace Math {
-
-void extract_frustum_planes(const glm::mat4& mvp_matrix,
-                            std::vector<glm::vec4>& planes) {
-    if (planes.size() != 6) {
-        planes.resize(6);
-    }
-
-    const float* m = glm::value_ptr(mvp_matrix);
-
-    // left plane
-    planes[0] =
-        glm::vec4(m[3] + m[0], m[7] + m[4], m[11] + m[8], m[15] + m[12]);
-    // right plane
-    planes[1] =
-        glm::vec4(m[3] - m[0], m[7] - m[4], m[11] - m[8], m[15] - m[12]);
-    // bottom plane
-    planes[2] =
-        glm::vec4(m[3] + m[1], m[7] + m[5], m[11] + m[9], m[15] + m[13]);
-    // top plane
-    planes[3] =
-        glm::vec4(m[3] - m[1], m[7] - m[5], m[11] - m[9], m[15] - m[13]);
-    // near plane
-    planes[4] =
-        glm::vec4(m[3] + m[2], m[7] + m[6], m[11] + m[10], m[15] + m[14]);
-    // far plane
-    planes[5] =
-        glm::vec4(m[3] - m[2], m[7] - m[6], m[11] - m[10], m[15] - m[14]);
-
-    for (auto& p : planes) {
-        p = glm::normalize(p);
-    }
-}
-
-float smootherstep(float edge0, float edge1, float x) {
-
-    x = std::clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
-
-    return x * x * x * (x * (6.0f * x - 15.0f) + 10.0f);
-}
-
-bool is_aabb_in_frustum(const glm::vec3& center, const glm::vec3& half_extents,
-                        const std::vector<glm::vec4>& planes) {
-    for (const auto& plane : planes) {
-        // distance
-        float d = glm::dot(glm::vec3(plane), center) + plane.w;
-        float r = half_extents.x * std::abs(plane.x) +
-                  half_extents.y * std::abs(plane.y) +
-                  half_extents.z * std::abs(plane.z);
-        if (d + r < 0) {
-            return false;
-        }
-    }
-    return true;
-}
-float deterministic_random(int x, int z, uint64_t seed) {
-    uint64_t h = seed;
-    h = h * 6364136223846793005ULL + (uint64_t)x;
-    h = h * 6364136223846793005ULL + (uint64_t)z;
-    return (float)(h >> 40) / (float)(1 << 24);
-}
-
-glm::vec3 slerp(const glm::vec3& from, const glm::vec3& to, float t) {
-
-    float cos_theta = glm::clamp(glm::dot(from, to), -1.0f, 1.0f);
-
-    if (cos_theta > 0.9995f) {
-        return glm::normalize(glm::mix(from, to, t));
-    }
-
-    if (cos_theta < -0.9995f) {
-
-        glm::vec3 axis = (std::fabs(from.x) < 0.9f)
-                             ? glm::vec3(1.0f, 0.0f, 0.0f)
-                             : glm::vec3(0.0f, 1.0f, 0.0f);
-        glm::vec3 ortho = glm::normalize(glm::cross(from, axis));
-
-        float angle = glm::pi<float>() * t;
-
-        glm::vec3 rotated =
-            from * std::cos(angle) + glm::cross(ortho, from) * std::sin(angle);
-
-        return glm::normalize(rotated);
-    }
-
-    float theta = std::acos(cos_theta);
-    float sin_theta = std::sin(theta);
-
-    float a = std::sin((1.0f - t) * theta) / sin_theta;
-    float b = std::sin(t * theta) / sin_theta;
-
-    return glm::normalize(a * from + b * to);
-}
-
-} // namespace Math
-
-} // namespace Cubed