From 3509d29964b42f51fbcd9688d35925218b37db19 Mon Sep 17 00:00:00 2001
From: outfrost <kotlet.bahn@gmail.com>
Date: Thu, 4 Jun 2020 01:59:20 +0200
Subject: [PATCH] Implement rudimentary player movement; fix geometry logic
 bugs

---
 Makefile                     |  1 +
 src/engine/geometry.c        |  9 ++++++---
 src/engine/geometry.h        |  2 +-
 src/{engine => game}/input.c |  8 +++++++-
 src/{engine => game}/input.h |  0
 src/game/player.c            | 21 +++++++++++++++++----
 src/main.c                   |  3 ++-
 7 files changed, 34 insertions(+), 10 deletions(-)
 rename src/{engine => game}/input.c (52%)
 rename src/{engine => game}/input.h (100%)

diff --git a/Makefile b/Makefile
index fe1e34a..9a9e0e5 100644
--- a/Makefile
+++ b/Makefile
@@ -22,6 +22,7 @@ sources ::= main.c \
             engine/scene.c \
             engine/tga.c \
             engine/ui.c \
+            game/input.c \
             game/level.c \
             game/player.c
 
diff --git a/src/engine/geometry.c b/src/engine/geometry.c
index 7af8c1c..2cfb0aa 100644
--- a/src/engine/geometry.c
+++ b/src/engine/geometry.c
@@ -17,17 +17,19 @@ Transform identity() {
 Transform multiply(Transform t1, Transform t2) {
 	GLfloat* a = (GLfloat*) &t1;
 	GLfloat* b = (GLfloat*) &t2;
+	Transform result;
+	GLfloat* c = (GLfloat*) &result;
 
 	for (size_t row = 0; row < 4; ++row) {
 		for (size_t col = 0; col < 4; ++col) {
-			b[(row * 4) + col] =
+			c[(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];
 		}
 	}
-	return t2;
+	return result;
 }
 
 void translate(Transform* transform, Vector3D vec) {
@@ -47,6 +49,7 @@ void rotate(Transform* transform, Vector3D axis, float angle) {
 	float sinA = sinf(angle);
 	float cosA = cosf(angle);
 	float omcA = 1 - cosA;
+
 	*transform = multiply(
 		(Transform) { l*l*omcA + cosA, m*l*omcA - n*sinA, n*l*omcA + m*sinA, 0.0f,
 		              l*m*omcA + n*sinA, m*m*omcA + cosA, n*m*omcA - l*sinA, 0.0f,
@@ -55,7 +58,7 @@ void rotate(Transform* transform, Vector3D axis, float angle) {
 		*transform);
 }
 
-Vector3D applyTransform(Transform* transform, Vector3D vec) {
+Vector3D applyTransform(Transform transform, Vector3D vec) {
 	GLfloat* a = (GLfloat*) &transform;
 	GLfloat b[4] = { vec.x, vec.y, vec.z, 1.0f };
 	GLfloat c[4];
diff --git a/src/engine/geometry.h b/src/engine/geometry.h
index 76e7cd0..ff45938 100644
--- a/src/engine/geometry.h
+++ b/src/engine/geometry.h
@@ -25,7 +25,7 @@ Transform identity();
 Transform multiply(Transform t1, Transform t2);
 void translate(Transform* transform, Vector3D vec);
 void rotate(Transform* transform, Vector3D axis, float angle);
-Vector3D applyTransform(Transform* transform, Vector3D vec);
+Vector3D applyTransform(Transform transform, Vector3D vec);
 Vector3D translationOf(Transform transform);
 Vector3D normalized(Vector3D vec);
 
diff --git a/src/engine/input.c b/src/game/input.c
similarity index 52%
rename from src/engine/input.c
rename to src/game/input.c
index 30c3ea0..447e92e 100644
--- a/src/engine/input.c
+++ b/src/game/input.c
@@ -5,10 +5,16 @@
 void onKeyPressed(unsigned char key, int x, int y) {
 	switch (key) {
 		case 'w':
+			playerMovementInput(0.0f, 1.0f);
+			break;
 		case 's':
+			playerMovementInput(0.0f, -1.0f);
+			break;
 		case 'a':
+			playerMovementInput(-1.0f, 0.0f);
+			break;
 		case 'd':
-			//playerMovementInput();
+			playerMovementInput(1.0f, 0.0f);
 			break;
 		default:
 			break;
diff --git a/src/engine/input.h b/src/game/input.h
similarity index 100%
rename from src/engine/input.h
rename to src/game/input.h
diff --git a/src/game/player.c b/src/game/player.c
index ed0dab9..560a044 100644
--- a/src/game/player.c
+++ b/src/game/player.c
@@ -4,10 +4,14 @@
 #include "engine/render.h"
 
 Scene* playerCharacter;
+static Transform movementDirectionTransform;
 
 
 
 void initPlayer() {
+	movementDirectionTransform = identity();
+	rotate(&movementDirectionTransform, (Vector3D) { 0.0f, 1.0f, 0.0f }, - TAU / 8.0f);
+
 	playerCharacter = newScene();
 	cameraAnchor = playerCharacter;
 	playerCharacter->solid = importSolid("assets/playercharacter.3ds");
@@ -19,8 +23,17 @@ void spawnPlayer(Transform transform) {
 }
 
 void playerMovementInput(float x, float y) {
-	Transform rotation = identity();
-	rotate(&rotation, (Vector3D) { 0.0f, 1.0f, 0.0f }, TAU / 8.0f);
-	Vector3D movementDirection = (Vector3D) { x, 0.0f, -y };
-	movementDirection = normalized(applyTransform(&rotation, movementDirection));
+	if (!playerCharacter) {
+		return;
+	}
+
+	Vector3D direction = (Vector3D) { x, 0.0f, -y };
+	direction = normalized(
+		applyTransform(movementDirectionTransform, direction));
+	float velocity = 1.0f;
+	Vector3D movement = { direction.x * velocity,
+	                      direction.y * velocity,
+	                      direction.z * velocity };
+
+	translate(&(playerCharacter->transform), movement);
 }
diff --git a/src/main.c b/src/main.c
index 7372d8e..abfd8e9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -6,6 +6,7 @@
 #include "engine/render.h"
 #include "engine/ui.h"
 
+#include "game/input.h"
 #include "game/level.h"
 #include "game/player.h"
 
@@ -50,7 +51,7 @@ int main(int argc, char** argv) {
 	
 	glutDisplayFunc(renderFrame);
 	glutReshapeFunc(resizeStage);
-	//glutKeyboardFunc(key_pressed);
+	glutKeyboardFunc(onKeyPressed);
 	//glutMouseFunc(mouse_button_event);
 	//glutMotionFunc(mouse_motion_event);
 	
-- 
2.44.0