From f8c6c26ece3fc6b34f3934aa5f5d719b015b1b7b Mon Sep 17 00:00:00 2001
From: outfrost <kotlet.bahn@gmail.com>
Date: Wed, 27 May 2020 01:31:50 +0200
Subject: [PATCH] Separate tranform code into geometry

---
 Makefile              |  1 +
 src/engine/geometry.c | 36 ++++++++++++++++++++++++++++++++++++
 src/engine/geometry.h | 14 ++++++++++++++
 src/engine/scene.c    | 34 +---------------------------------
 src/engine/scene.h    | 12 ------------
 src/game/player.h     |  1 -
 6 files changed, 52 insertions(+), 46 deletions(-)
 create mode 100644 src/engine/geometry.c

diff --git a/Makefile b/Makefile
index 4184930..cf09258 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@ LDLIBS ::= -lGL -lGLEW -lglut -lassimp $(LDLIBS)
 
 sources ::= main.c \
             engine/asset.c \
+            engine/geometry.c \
             engine/logger.c \
             engine/performance.c \
             engine/render.c \
diff --git a/src/engine/geometry.c b/src/engine/geometry.c
new file mode 100644
index 0000000..5e0efab
--- /dev/null
+++ b/src/engine/geometry.c
@@ -0,0 +1,36 @@
+#include <stddef.h>
+
+#include "geometry.h"
+
+Transform identity() {
+	return (Transform) { .a1 = 1.0f, .a2 = 0.0f, .a3 = 0.0f, .a4 = 0.0f,
+	                     .b1 = 0.0f, .b2 = 1.0f, .b3 = 0.0f, .b4 = 0.0f,
+	                     .c1 = 0.0f, .c2 = 0.0f, .c3 = 1.0f, .c4 = 0.0f,
+	                     .d1 = 0.0f, .d2 = 0.0f, .d3 = 0.0f, .d4 = 1.0f };
+}
+
+void multiply(Transform* transform, Transform by) {
+	GLfloat* a = (GLfloat*) &by;
+	GLfloat* b = (GLfloat*) transform;
+
+	for (size_t row = 0; row < 4; ++row) {
+		for (size_t col = 0; col < 4; ++col) {
+			b[(row * 4) + col] =
+				a[(row * 4) + 0] * b[(0 * 4) + col]
+				+ a[(row * 4) + 1] * b[(1 * 4) + col]
+				+ a[(row * 4) + 2] * b[(2 * 4) + col]
+				+ a[(row * 4) + 3] * b[(3 * 4) + col];
+		}
+	}
+}
+
+void translate(Transform* transform, Vector3D vec) {
+	multiply(transform, (Transform) { .a1 = 1.0f, .a2 = 0.0f, .a3 = 0.0f, .a4 = vec.x,
+                                      .b1 = 0.0f, .b2 = 1.0f, .b3 = 0.0f, .b4 = vec.y,
+                                      .c1 = 0.0f, .c2 = 0.0f, .c3 = 1.0f, .c4 = vec.z,
+                                      .d1 = 0.0f, .d2 = 0.0f, .d3 = 0.0f, .d4 = 1.0f });
+}
+
+Vector3D translationOf(Transform transform) {
+	return (Vector3D) { transform.a4, transform.b4, transform.c4 };
+}
diff --git a/src/engine/geometry.h b/src/engine/geometry.h
index 9f6dc58..32642a5 100644
--- a/src/engine/geometry.h
+++ b/src/engine/geometry.h
@@ -1,7 +1,10 @@
 #ifndef GEOMETRY_H_
 #define GEOMETRY_H_
 
+#include <GL/gl.h>
+
 typedef struct Vector3D Vector3D;
+typedef struct Transform Transform;
 
 struct Vector3D {
 	float x;
@@ -9,4 +12,15 @@ struct Vector3D {
 	float z;
 };
 
+struct Transform {
+	GLfloat a1, a2, a3, a4;
+	GLfloat b1, b2, b3, b4;
+	GLfloat c1, c2, c3, c4;
+	GLfloat d1, d2, d3, d4;
+};
+
+Transform identity();
+void translate(Transform* transform, Vector3D vec);
+Vector3D translationOf(Transform transform);
+
 #endif
diff --git a/src/engine/scene.c b/src/engine/scene.c
index 5cbe405..0812c79 100644
--- a/src/engine/scene.c
+++ b/src/engine/scene.c
@@ -2,45 +2,13 @@
 
 #include "engine/logger.h"
 
+#include "geometry.h"
 #include "scene.h"
 
 Scene* currentScene = NULL;
 
 
 
-Transform identity() {
-	return (Transform) { .a1 = 1.0f, .a2 = 0.0f, .a3 = 0.0f, .a4 = 0.0f,
-	                     .b1 = 0.0f, .b2 = 1.0f, .b3 = 0.0f, .b4 = 0.0f,
-	                     .c1 = 0.0f, .c2 = 0.0f, .c3 = 1.0f, .c4 = 0.0f,
-	                     .d1 = 0.0f, .d2 = 0.0f, .d3 = 0.0f, .d4 = 1.0f };
-}
-
-void multiply(Transform* transform, Transform by) {
-	GLfloat* a = (GLfloat*) &by;
-	GLfloat* b = (GLfloat*) transform;
-
-	for (size_t row = 0; row < 4; ++row) {
-		for (size_t col = 0; col < 4; ++col) {
-			b[(row * 4) + col] =
-				a[(row * 4) + 0] * b[(0 * 4) + col]
-				+ a[(row * 4) + 1] * b[(1 * 4) + col]
-				+ a[(row * 4) + 2] * b[(2 * 4) + col]
-				+ a[(row * 4) + 3] * b[(3 * 4) + col];
-		}
-	}
-}
-
-void translate(Transform* transform, Vector3D vec) {
-	multiply(transform, (Transform) { .a1 = 1.0f, .a2 = 0.0f, .a3 = 0.0f, .a4 = vec.x,
-                                      .b1 = 0.0f, .b2 = 1.0f, .b3 = 0.0f, .b4 = vec.y,
-                                      .c1 = 0.0f, .c2 = 0.0f, .c3 = 1.0f, .c4 = vec.z,
-                                      .d1 = 0.0f, .d2 = 0.0f, .d3 = 0.0f, .d4 = 1.0f });
-}
-
-Vector3D translationOf(Transform transform) {
-	return (Vector3D) { transform.a4, transform.b4, transform.c4 };
-}
-
 Scene* newScene() {
 	Scene* scene = malloc(sizeof(Scene));
 	*scene = (Scene) { .parent = NULL,
diff --git a/src/engine/scene.h b/src/engine/scene.h
index 24b308a..c32694a 100644
--- a/src/engine/scene.h
+++ b/src/engine/scene.h
@@ -4,14 +4,6 @@
 #include "asset.h"
 
 typedef struct Scene Scene;
-typedef struct Transform Transform;
-
-struct Transform {
-	GLfloat a1, a2, a3, a4;
-	GLfloat b1, b2, b3, b4;
-	GLfloat c1, c2, c3, c4;
-	GLfloat d1, d2, d3, d4;
-};
 
 struct Scene {
 	Scene* parent;
@@ -23,10 +15,6 @@ struct Scene {
 
 Scene* currentScene;
 
-Transform identity();
-void translate(Transform* transform, Vector3D vec);
-Vector3D translationOf(Transform transform);
-
 Scene* newScene();
 void insertChildScene(Scene* scene, Scene* newChild);
 void reparentScene(Scene* scene, Scene* newParent);
diff --git a/src/game/player.h b/src/game/player.h
index 9a7c250..373204f 100644
--- a/src/game/player.h
+++ b/src/game/player.h
@@ -3,7 +3,6 @@
 
 #include <GL/gl.h>
 
-#include "engine/geometry.h"
 #include "engine/scene.h"
 
 Scene* playerCharacter;
-- 
2.44.0