Revert "raymath.h: Use C99 inline semantics"

This reverts commit 6ffc8cb7990fb4ff40f205cb53bec797b10e48a2.
and commit e4d7bbec1ef08279495ac41f5f8c4be359c58cf0.
which I pushed by mistake...

3 files changed, 144 insertions, 59 deletions

diff --git a/src/core.c b/src/core.c
index 0382aacd..137c0b61 100644
--- a/src/core.c
+++ b/src/core.c
@@ -98,12 +98,13 @@
     #define _POSIX_C_SOURCE 199309L // Required for CLOCK_MONOTONIC if compiled with c99 without gnu ext.
 #endif
 
-#define RAYMATH_IMPLEMENTATION  // Define external out-of-line implementation of raymath here
-#include "raymath.h"            // Required for: Vector3 and Matrix functions
-
 #include "rlgl.h"           // raylib OpenGL abstraction layer to OpenGL 1.1, 3.3+ or ES2
 #include "utils.h"          // Required for: fopen() Android mapping
 
+#define RAYMATH_IMPLEMENTATION  // Use raymath as a header-only library (includes implementation)
+#define RAYMATH_EXTERN_INLINE   // Compile raymath functions as static inline (remember, it's a compiler hint)
+#include "raymath.h"            // Required for: Vector3 and Matrix functions
+
 #if defined(SUPPORT_GESTURES_SYSTEM)
     #define GESTURES_IMPLEMENTATION
     #include "gestures.h"       // Gestures detection functionality
diff --git a/src/raylib.h b/src/raylib.h
index 66598b27..41755dc3 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -742,6 +742,13 @@ RLAPI Vector3 ColorToHSV(Color color);                            // Returns HSV
 RLAPI Color GetColor(int hexValue);                               // Returns a Color struct from hexadecimal value
 RLAPI Color Fade(Color color, float alpha);                       // Color fade-in or fade-out, alpha goes from 0.0f to 1.0f
 
+// Math useful functions (available from raymath.h)
+RLAPI float *Vector3ToFloat(Vector3 vec);                         // Returns Vector3 as float array
+RLAPI float *MatrixToFloat(Matrix mat);                           // Returns Matrix as float array
+RLAPI Vector3 Vector3Zero(void);                                  // Vector with components value 0.0f
+RLAPI Vector3 Vector3One(void);                                   // Vector with components value 1.0f
+RLAPI Matrix MatrixIdentity(void);                                // Returns identity matrix
+
 // Misc. functions
 RLAPI void ShowLogo(void);                                        // Activate raylib logo at startup (can be done with flags)
 RLAPI void SetConfigFlags(unsigned char flags);                   // Setup window configuration flags (view FLAGS)
diff --git a/src/raymath.h b/src/raymath.h
index a781ec80..c29c6b95 100644
--- a/src/raymath.h
+++ b/src/raymath.h
@@ -9,9 +9,8 @@
 *       If not defined, the library is in header only mode and can be included in other headers
 *       or source files without problems. But only ONE file should hold the implementation.
 *
-*   #define RAYMATH_HEADER_ONLY
-*       Define static inline functions code, so #include header suffices for use.
-*       This may use up lots of memory.
+*   #define RAYMATH_EXTERN_INLINE
+*       Inlines all functions code, so it runs faster. This requires lots of memory on system.
 *   
 *   #define RAYMATH_STANDALONE
 *       Avoid raylib.h header inclusion in this file. 
@@ -42,8 +41,8 @@
 #ifndef RAYMATH_H
 #define RAYMATH_H
 
-//#define RAYMATH_STANDALONE      // NOTE: To use raymath as standalone lib, just uncomment this line
-//#define RAYMATH_HEADER_ONLY     // NOTE: To compile functions as static inline, uncomment this line
+//#define RAYMATH_STANDALONE        // NOTE: To use raymath as standalone lib, just uncomment this line
+//#define RAYMATH_EXTERN_INLINE     // NOTE: To compile functions as static inline, uncomment this line
 
 #ifndef RAYMATH_STANDALONE
     #include "raylib.h"             // Required for structs: Vector3, Matrix
@@ -52,22 +51,15 @@
 #ifdef __cplusplus
     #define RMEXTERN extern "C"     // Functions visible from other files (no name mangling of functions in C++)
 #else
-    #define RMEXTERN                // Functions visible from other files
+    #define RMEXTERN extern         // Functions visible from other files
 #endif
 
-#if defined RAYMATH_IMPLEMENTATION && defined RAYMATH_HEADER_ONLY
-    #error "Specifying both RAYMATH_IMPLEMENTATION and RAYMATH_HEADER_ONLY is contradictory"
-#endif
-
-#ifdef RAYMATH_IMPLEMENTATION
-    #define RMDEF extern inline // Provide external definition
-#elif defined RAYMATH_HEADER_ONLY
-    #define RMDEF static inline // Functions may be inlined, no external out-of-line definition
+#if defined(RAYMATH_EXTERN_INLINE)
+    #define RMDEF RMEXTERN inline   // Functions are embeded inline (compiler generated code)
 #else
-    #define RMDEF inline        // Functions may be inlined or external definition used
+    #define RMDEF RMEXTERN
 #endif
 
-
 //----------------------------------------------------------------------------------
 // Defines and Macros
 //----------------------------------------------------------------------------------
@@ -110,14 +102,6 @@
     } Matrix;
 #endif
 
-// Helper types to be used instead of array return types for *ToFloat functions
-typedef struct Float3 {
-    float f[3];
-} Float3;
-typedef struct Float16 {
-    float f[16];
-} Float16;
-
 // Quaternion type
 typedef struct Quaternion {
     float x;
@@ -126,6 +110,105 @@ typedef struct Quaternion {
     float w;
 } Quaternion;
 
+#ifndef RAYMATH_EXTERN_INLINE
+
+//------------------------------------------------------------------------------------
+// Functions Declaration - math utils
+//------------------------------------------------------------------------------------
+RMDEF float Clamp(float value, float min, float max);           // Clamp float value
+
+//------------------------------------------------------------------------------------
+// Functions Declaration to work with Vector2
+//------------------------------------------------------------------------------------
+RMDEF Vector2 Vector2Zero(void);                                // Vector with components value 0.0f
+RMDEF Vector2 Vector2One(void);                                 // Vector with components value 1.0f
+RMDEF Vector2 Vector2Add(Vector2 v1, Vector2 v2);               // Add two vectors (v1 + v2)
+RMDEF Vector2 Vector2Subtract(Vector2 v1, Vector2 v2);          // Subtract two vectors (v1 - v2)
+RMDEF float Vector2Length(Vector2 v);                           // Calculate vector length
+RMDEF float Vector2DotProduct(Vector2 v1, Vector2 v2);          // Calculate two vectors dot product
+RMDEF float Vector2Distance(Vector2 v1, Vector2 v2);            // Calculate distance between two vectors
+RMDEF float Vector2Angle(Vector2 v1, Vector2 v2);               // Calculate angle between two vectors in X-axis
+RMDEF void Vector2Scale(Vector2 *v, float scale);               // Scale vector (multiply by value)
+RMDEF void Vector2Negate(Vector2 *v);                           // Negate vector
+RMDEF void Vector2Divide(Vector2 *v, float div);                // Divide vector by a float value
+RMDEF void Vector2Normalize(Vector2 *v);                        // Normalize provided vector
+
+//------------------------------------------------------------------------------------
+// Functions Declaration to work with Vector3
+//------------------------------------------------------------------------------------
+RMDEF Vector3 Vector3Zero(void);                                 // Vector with components value 0.0f
+RMDEF Vector3 Vector3One(void);                                  // Vector with components value 1.0f
+RMDEF Vector3 Vector3Add(Vector3 v1, Vector3 v2);                // Add two vectors
+RMDEF Vector3 Vector3Multiply(Vector3 v, float scalar);          // Multiply vector by scalar
+RMDEF Vector3 Vector3MultiplyV(Vector3 v1, Vector3 v2);          // Multiply vector by vector
+RMDEF Vector3 Vector3Subtract(Vector3 v1, Vector3 v2);           // Substract two vectors
+RMDEF Vector3 Vector3CrossProduct(Vector3 v1, Vector3 v2);       // Calculate two vectors cross product
+RMDEF Vector3 Vector3Perpendicular(Vector3 v);                   // Calculate one vector perpendicular vector
+RMDEF float Vector3Length(const Vector3 v);                      // Calculate vector length
+RMDEF float Vector3DotProduct(Vector3 v1, Vector3 v2);           // Calculate two vectors dot product
+RMDEF float Vector3Distance(Vector3 v1, Vector3 v2);             // Calculate distance between two points
+RMDEF void Vector3Scale(Vector3 *v, float scale);                // Scale provided vector
+RMDEF void Vector3Negate(Vector3 *v);                            // Negate provided vector (invert direction)
+RMDEF void Vector3Normalize(Vector3 *v);                         // Normalize provided vector
+RMDEF void Vector3Transform(Vector3 *v, Matrix mat);             // Transforms a Vector3 by a given Matrix
+RMDEF Vector3 Vector3Lerp(Vector3 v1, Vector3 v2, float amount); // Calculate linear interpolation between two vectors
+RMDEF Vector3 Vector3Reflect(Vector3 vector, Vector3 normal);    // Calculate reflected vector to normal
+RMDEF Vector3 Vector3Min(Vector3 vec1, Vector3 vec2);            // Return min value for each pair of components
+RMDEF Vector3 Vector3Max(Vector3 vec1, Vector3 vec2);            // Return max value for each pair of components
+RMDEF Vector3 Vector3Barycenter(Vector3 p, Vector3 a, Vector3 b, Vector3 c); // Barycenter coords for p in triangle abc
+RMDEF float *Vector3ToFloat(Vector3 vec);                        // Returns Vector3 as float array
+
+//------------------------------------------------------------------------------------
+// Functions Declaration to work with Matrix
+//------------------------------------------------------------------------------------
+RMDEF float MatrixDeterminant(Matrix mat);                      // Compute matrix determinant
+RMDEF float MatrixTrace(Matrix mat);                            // Returns the trace of the matrix (sum of the values along the diagonal)
+RMDEF void MatrixTranspose(Matrix *mat);                        // Transposes provided matrix
+RMDEF void MatrixInvert(Matrix *mat);                           // Invert provided matrix
+RMDEF void MatrixNormalize(Matrix *mat);                        // Normalize provided matrix
+RMDEF Matrix MatrixIdentity(void);                              // Returns identity matrix
+RMDEF Matrix MatrixAdd(Matrix left, Matrix right);              // Add two matrices
+RMDEF Matrix MatrixSubstract(Matrix left, Matrix right);        // Substract two matrices (left - right)
+RMDEF Matrix MatrixTranslate(float x, float y, float z);        // Returns translation matrix
+RMDEF Matrix MatrixRotate(Vector3 axis, float angle);           // Returns rotation matrix for an angle around an specified axis (angle in radians)
+RMDEF Matrix MatrixRotateX(float angle);                        // Returns x-rotation matrix (angle in radians)
+RMDEF Matrix MatrixRotateY(float angle);                        // Returns y-rotation matrix (angle in radians)
+RMDEF Matrix MatrixRotateZ(float angle);                        // Returns z-rotation matrix (angle in radians)
+RMDEF Matrix MatrixScale(float x, float y, float z);            // Returns scaling matrix
+RMDEF Matrix MatrixMultiply(Matrix left, Matrix right);         // Returns two matrix multiplication
+RMDEF Matrix MatrixFrustum(double left, double right, double bottom, double top, double near, double far);  // Returns perspective projection matrix
+RMDEF Matrix MatrixPerspective(double fovy, double aspect, double near, double far);                        // Returns perspective projection matrix
+RMDEF Matrix MatrixOrtho(double left, double right, double bottom, double top, double near, double far);    // Returns orthographic projection matrix
+RMDEF Matrix MatrixLookAt(Vector3 position, Vector3 target, Vector3 up);  // Returns camera look-at matrix (view matrix)
+RMDEF float *MatrixToFloat(Matrix mat);                         // Returns float array of Matrix data
+
+//------------------------------------------------------------------------------------
+// Functions Declaration to work with Quaternions
+//------------------------------------------------------------------------------------
+RMDEF Quaternion QuaternionIdentity(void);                      // Returns identity quaternion
+RMDEF float QuaternionLength(Quaternion quat);                  // Compute the length of a quaternion
+RMDEF void QuaternionNormalize(Quaternion *q);                  // Normalize provided quaternion
+RMDEF void QuaternionInvert(Quaternion *quat);                  // Invert provided quaternion
+RMDEF Quaternion QuaternionMultiply(Quaternion q1, Quaternion q2);    // Calculate two quaternion multiplication
+RMDEF Quaternion QuaternionLerp(Quaternion q1, Quaternion q2, float amount);    // Calculate linear interpolation between two quaternions
+RMDEF Quaternion QuaternionNlerp(Quaternion q1, Quaternion q2, float amount);   // Calculate slerp-optimized interpolation between two quaternions
+RMDEF Quaternion QuaternionSlerp(Quaternion q1, Quaternion q2, float amount);   // Calculates spherical linear interpolation between two quaternions
+RMDEF Quaternion QuaternionFromVector3ToVector3(Vector3 from, Vector3 to);      // Calculate quaternion based on the rotation from one vector to another
+RMDEF Quaternion QuaternionFromMatrix(Matrix matrix);                 // Returns a quaternion for a given rotation matrix
+RMDEF Matrix QuaternionToMatrix(Quaternion q);                        // Returns a matrix for a given quaternion
+RMDEF Quaternion QuaternionFromAxisAngle(Vector3 axis, float angle);  // Returns rotation quaternion for an angle and axis
+RMDEF void QuaternionToAxisAngle(Quaternion q, Vector3 *outAxis, float *outAngle);  // Returns the rotation angle and axis for a given quaternion
+RMDEF Quaternion QuaternionFromEuler(float roll, float pitch, float yaw);           // Returns he quaternion equivalent to Euler angles
+RMDEF Vector3 QuaternionToEuler(Quaternion q);                  // Return the Euler angles equivalent to quaternion (roll, pitch, yaw)
+RMDEF void QuaternionTransform(Quaternion *q, Matrix mat);      // Transform a quaternion given a transformation matrix
+
+#endif  // notdef RAYMATH_EXTERN_INLINE
+
+#endif  // RAYMATH_H
+//////////////////////////////////////////////////////////////////// end of header file
+
+#if defined(RAYMATH_IMPLEMENTATION) || defined(RAYMATH_EXTERN_INLINE)
+
 #include <math.h>       // Required for: sinf(), cosf(), tan(), fabs()
 
 //----------------------------------------------------------------------------------
@@ -465,19 +548,16 @@ RMDEF Vector3 Vector3Barycenter(Vector3 p, Vector3 a, Vector3 b, Vector3 c)
 }
 
 // Returns Vector3 as float array
-RMDEF Float3 Vector3ToFloat_(Vector3 vec)
+RMDEF float *Vector3ToFloat(Vector3 vec)
 {
-    Float3 buffer;
+    static float buffer[3];
 
-    buffer.f[0] = vec.x;
-    buffer.f[1] = vec.y;
-    buffer.f[2] = vec.z;
+    buffer[0] = vec.x;
+    buffer[1] = vec.y;
+    buffer[2] = vec.z;
 
     return buffer;
 }
-#ifndef Vector3ToFloat
-#define Vector3ToFloat(vec) (Vector3ToFloat_(vec).f) 
-#endif
 
 //----------------------------------------------------------------------------------
 // Module Functions Definition - Matrix math
@@ -913,32 +993,29 @@ RMDEF Matrix MatrixLookAt(Vector3 eye, Vector3 target, Vector3 up)
 }
 
 // Returns float array of matrix data
-RMDEF Float16 MatrixToFloat_(Matrix mat)
-{
-    Float16 buffer;
-
-    buffer.f[0] = mat.m0;
-    buffer.f[1] = mat.m1;
-    buffer.f[2] = mat.m2;
-    buffer.f[3] = mat.m3;
-    buffer.f[4] = mat.m4;
-    buffer.f[5] = mat.m5;
-    buffer.f[6] = mat.m6;
-    buffer.f[7] = mat.m7;
-    buffer.f[8] = mat.m8;
-    buffer.f[9] = mat.m9;
-    buffer.f[10] = mat.m10;
-    buffer.f[11] = mat.m11;
-    buffer.f[12] = mat.m12;
-    buffer.f[13] = mat.m13;
-    buffer.f[14] = mat.m14;
-    buffer.f[15] = mat.m15;
+RMDEF float *MatrixToFloat(Matrix mat)
+{
+    static float buffer[16];
+
+    buffer[0] = mat.m0;
+    buffer[1] = mat.m1;
+    buffer[2] = mat.m2;
+    buffer[3] = mat.m3;
+    buffer[4] = mat.m4;
+    buffer[5] = mat.m5;
+    buffer[6] = mat.m6;
+    buffer[7] = mat.m7;
+    buffer[8] = mat.m8;
+    buffer[9] = mat.m9;
+    buffer[10] = mat.m10;
+    buffer[11] = mat.m11;
+    buffer[12] = mat.m12;
+    buffer[13] = mat.m13;
+    buffer[14] = mat.m14;
+    buffer[15] = mat.m15;
 
     return buffer;
 }
-#ifndef MatrixToFloat
-#define MatrixToFloat(mat) (MatrixToFloat_(mat).f)
-#endif
 
 //----------------------------------------------------------------------------------
 // Module Functions Definition - Quaternion math
@@ -1301,4 +1378,4 @@ RMDEF void QuaternionTransform(Quaternion *q, Matrix mat)
     q->w = mat.m3*x + mat.m7*y + mat.m11*z + mat.m15*w;
 }
 
-#endif  // RAYMATH_H
+#endif  // RAYMATH_IMPLEMENTATION