imporve w & s

src/main.c

@@ -45,6 +45,7 @@ int framesSinceUpdate = 0;
 GLfloat step = 0.0f;
 const GLfloat pi = 3.14159f;
 
+vec3 origin = {0.0f, 0.0f, 0.0f};
 vec3 cameraPosition = {0.0f, 2.0f, 1.0f};
 vec3 objectPosition = {0.0f, 0.0f, 0.0f};
 
@@ -102,10 +103,26 @@ void handleInputs(double deltaTime) {
     }
     if (!cameraTraveling) {
         if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS) {
-            cameraPosition.z += deltaTime * 10;
+            vec3 delta;
+
+            vec3Subtract(&delta, &origin, &cameraPosition);
+            vec3Normalise(&delta, &delta);
+            vec3Multiply(&delta, &delta, -10);
+            vec3Multiply(&delta, &delta, deltaTime);
+
+            vec3Add(&cameraPosition, &cameraPosition, &delta);
         }
         if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS) {
-            cameraPosition.z -= deltaTime * 10;
+            vec3 delta;
+            vec3Subtract(&delta, &origin, &cameraPosition);
+            if (vec3Length(&delta) > 0.1) {
+                vec3Normalise(&delta, &delta);
+                vec3Multiply(&delta, &delta, 10);
+                vec3Multiply(&delta, &delta, deltaTime);
+
+                vec3Add(&cameraPosition, &cameraPosition, &delta);
+            }
+            
         }
         if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS) {
             cameraPosition.x += deltaTime * 10;
@@ -342,7 +359,6 @@ void draw(void) {
     GLfloat stepi = step * pi * 2;
 
     // ------------- VIEWING TRANSFORMATION -------------------
-    vec3 origin = {0.0f, 0.0f, 0.0f};
     vec3 up = {0.0f, 1.0f, 0.0f};
 
     lookAt(&viewingTransformation, &cameraPosition, &origin, &up);