From b67db796d4e5eb30afd319d021573b53eba61730 Mon Sep 17 00:00:00 2001
From: Chukobyte <michaelsmith8293@gmail.com>
Date: Sun, 28 Jan 2024 18:09:30 -0500
Subject: [PATCH] Adding transform2d lerp.

---
 seika/math/se_math.c | 18 +++++++++++++-----
 seika/math/se_math.h |  5 +++--
 vcpkg.json           |  2 +-
 3 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/seika/math/se_math.c b/seika/math/se_math.c
index cf0ee19..40e46b6 100644
--- a/seika/math/se_math.c
+++ b/seika/math/se_math.c
@@ -5,10 +5,10 @@ bool ska_math_vec2_equals(const SKAVector2* v1, const SKAVector2* v2) {
     return v1->x == v2->x && v1->y == v2->y;
 }
 
-SKAVector2 ska_math_vec2_lerp(const SKAVector2* v1, const SKAVector2* v2, float t) {
+SKAVector2 ska_math_vec2_lerp(const SKAVector2* v1, const SKAVector2* v2, float alpha) {
     return (SKAVector2) {
-        .x = ska_math_lerpf(v1->x, v2->x, t),
-        .y = ska_math_lerpf(v1->y, v2->y, t)
+        .x = ska_math_lerpf(v1->x, v2->x, alpha),
+        .y = ska_math_lerpf(v1->y, v2->y, alpha)
     };
 }
 
@@ -55,6 +55,14 @@ void ska_transform2d_transform_to_mat4(const SKATransform2D* transform, mat4 mat
     glm_scale(matrix, (vec3){transform->scale.x, transform->scale.y, 1.0f});
 }
 
+SKATransform2D ska_transform2d_lerp(const SKATransform2D* tA, const SKATransform2D* tB, float alpha) {
+    return (SKATransform2D) {
+            .position = ska_math_vec2_lerp(&tA->position, &tB->position, alpha),
+            .scale = ska_math_vec2_lerp(&tA->scale, &tB->scale, alpha),
+            .rotation = ska_math_lerpf(tA->rotation, tB->rotation, alpha)
+    };
+}
+
 // --- Transform2D Model --- //
 SKATransform2D ska_transform2d_model_convert_to_transform(SKATransformModel2D* transformModel2D) {
     SKATransform2D transform2D;
@@ -104,8 +112,8 @@ SKAVector2 ska_math_minmax_vec2_get_random_in_range(const SKAMinMaxVec2* minmax)
 }
 
 // --- Misc --- //
-float ska_math_lerpf(float a, float b, float t) {
-    return a + (b - a) * t;
+float ska_math_lerpf(float a, float b, float alpha) {
+    return a + (b - a) * alpha;
 }
 
 float ska_math_map_to_range(float input, float inputMin, float inputMax, float outputMin, float outputMax) {
diff --git a/seika/math/se_math.h b/seika/math/se_math.h
index e7e9ae2..5dc44a8 100644
--- a/seika/math/se_math.h
+++ b/seika/math/se_math.h
@@ -33,7 +33,7 @@ typedef struct SKAVector2 {
 #define SKA_VECTOR2_DOWN SKA_STRUCT_LITERAL(SKAVector2){ 0.0f, 1.0f }
 
 bool ska_math_vec2_equals(const SKAVector2* v1, const SKAVector2* v2);
-SKAVector2 ska_math_vec2_lerp(const SKAVector2* v1, const SKAVector2* v2, float t);
+SKAVector2 ska_math_vec2_lerp(const SKAVector2* v1, const SKAVector2* v2, float alpha);
 float ska_math_vec2_angle(const SKAVector2* v);
 
 // --- SKAVector2i --- //
@@ -77,6 +77,7 @@ typedef struct SKATransform2D {
 
 void ska_transform2d_mat4_to_transform(mat4 matrix, SKATransform2D* transform);
 void ska_transform2d_transform_to_mat4(const SKATransform2D* transform, mat4 matrix);
+SKATransform2D ska_transform2d_lerp(const SKATransform2D* tA, const SKATransform2D* tB, float alpha);
 
 #define SKA_TRANSFORM_IDENTITY SKA_STRUCT_LITERAL(SKATransform2D){ \
     .position = SKA_VECTOR2_ZERO, \
@@ -147,7 +148,7 @@ typedef struct SKAMinMaxVec2 {
 SKAVector2 ska_math_minmax_vec2_get_random_in_range(const SKAMinMaxVec2* minmax);
 
 // --- Misc --- //
-float ska_math_lerpf(float a, float b, float t);
+float ska_math_lerpf(float a, float b, float alpha);
 float ska_math_map_to_range(float input, float inputMin, float inputMax, float outputMin, float outputMax);
 float ska_math_map_to_unit(float input, float inputMin, float inputMax);
 double ska_math_map_to_range_double(double input, double inputMin, double inputMax, double outputMin, double outputMax);
diff --git a/vcpkg.json b/vcpkg.json
index 2a9d83f..b7ac841 100644
--- a/vcpkg.json
+++ b/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "seika",
-  "version": "0.0.24",
+  "version": "0.0.25",
   "dependencies": [
     {
       "name": "sdl2",