From fd229306734ac8f9243a278b31d8643b1ada9529 Mon Sep 17 00:00:00 2001
From: Allanis <allanis@saracraft.net>
Date: Fri, 1 Feb 2013 22:47:04 +0000
Subject: [PATCH] [Fix] Stars make a bit more sense now! :D

---
 src/space.c | 50 ++++++++++++++++++++++++++++----------------------
 1 file changed, 28 insertions(+), 22 deletions(-)

diff --git a/src/space.c b/src/space.c
index 7351a66..437ce81 100644
--- a/src/space.c
+++ b/src/space.c
@@ -54,8 +54,8 @@ static gl_texture* starBG_create(const int density) {
   w = (int)((float)gl_screen.w * 1.5);
   if((w & (w-1)) != 0) {
     w = 1;
-    while(h < (int)((float)gl_screen.h*1.5))
-      h <<= 1;
+    while(w < (int)((float)gl_screen.w*1.5))
+      w <<= 1;
   }
   h = (int)((float)gl_screen.h * 1.5);
   if((h & (h-1)) != 0) {
@@ -94,12 +94,13 @@ void space_init(void) {
 
 void space_render(FP dt) {
   int i;
-  Vec2 tmp = { .x = starPos[0].x };
+  Vec2 tmp;
+  FP f;
 
   for(i = 0; i < STAR_LAYERS; i++) {
     // Movement.
-    starPos[i].x -= player->solid->vel.x / (FP)(2*i+4)*dt;
-    starPos[i].y -= player->solid->vel.y / (FP)(2*i+4)*dt;
+    starPos[i].x -= player->solid->vel.x / (FP)(2*i+10)*dt;
+    starPos[i].y -= player->solid->vel.y / (FP)(2*i+104)*dt;
 
     // Displaces x if reaches edge.
     if(starPos[i].x > 0)
@@ -119,23 +120,28 @@ void space_render(FP dt) {
     tmp.x = starPos[i].x;
     tmp.y = starPos[i].y;
 
-    // TODO: This needs optimizing.
-    tmp.x -= starBG[i]->w;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.y += starBG[i]->h;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.x += starBG[i]->w;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.x += starBG[i]->w;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.y -= starBG[i]->h;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.y -= starBG[i]->h;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.x -= starBG[i]->w;
-    gl_blitStatic(starBG[i], &tmp);
-    tmp.x -= starBG[i]->w;
-    gl_blitStatic(starBG[i], &tmp);
+    // More blits if part of the screen is blank.
+    if(starPos[i].x < starBG[i]->w/4.)
+      tmp.x += starBG[i]->w;
+    else if(starPos[i].x < starBG[i]->w*3./4.)
+      tmp.y -= starBG[i]->w;
+
+    if(starPos[i].y < starBG[i]->h/4.)
+      tmp.y += starBG[i]->h;
+    else if(starPos[i].y < starBG[i]->h*3./4.)
+      tmp.y -= starBG[i]->h;
+
+    if(tmp.x != starPos[i].x && tmp.y != starPos[i].y) {
+      gl_blitStatic(starBG[i], &tmp);
+      f = tmp.x;
+      tmp.x = starPos[i].x;
+      gl_blitStatic(starBG[i], &tmp);
+      tmp.x = f;
+      tmp.y = starPos[i].y;
+      gl_blitStatic(starBG[i], &tmp);
+    }
+    else if(tmp.x != starPos[i].x || tmp.y != starPos[i].y)
+      gl_blitStatic(starBG[i], &tmp);
   }
 }