Run the magic smoke wallpaper at lower priority, and make its animation

time based so it runs at constant speed regardless of framerate.
Also fix the red flash when first starting the wallpaper.

1 files changed, 25 insertions, 14 deletions

diff --git a/res/raw/clouds.rs b/res/raw/clouds.rs
index 2d867e9..1c02c03 100644
--- a/res/raw/clouds.rs
+++ b/res/raw/clouds.rs
@@ -33,7 +33,8 @@ float rotation[5];
 float scale[5];
 float alphafactor;
 int currentpreset;
-
+int lastuptime;
+float timedelta;
 
 void drawCloud(float *ident, int id, int idx) {
     float mat1[16];
@@ -63,35 +64,42 @@ void drawClouds(float* ident) {
 
     matrixLoadMat(mat1,ident);
 
+    if (State->mRotate != 0) {
+        rotation[0] += 0.10 * timedelta;
+        rotation[1] += 0.102f * timedelta;
+        rotation[2] += 0.106f * timedelta;
+        rotation[3] += 0.114f * timedelta;
+        rotation[4] += 0.123f * timedelta;
+    }
 
     int mask = State->mTextureMask;
     if (mask & 1) {
+        xshift[0] += 0.0010f * timedelta;
         if (State->mTextureSwap != 0) {
             drawCloud(mat1, NAMED_Tnoise5, 0);
         } else {
             drawCloud(mat1, NAMED_Tnoise1, 0);
         }
-        xshift[0] += 0.0010f;
     }
 
     if (mask & 2) {
+        xshift[1] += 0.00106 * timedelta;
         drawCloud(mat1, NAMED_Tnoise2, 1);
-        xshift[1] += 0.00106;
     }
 
     if (mask & 4) {
+        xshift[2] += 0.00114f * timedelta;
         drawCloud(mat1, NAMED_Tnoise3, 2);
-        xshift[2] += 0.00114f;
     }
 
     if (mask & 8) {
+        xshift[3] += 0.00118f * timedelta;
         drawCloud(mat1, NAMED_Tnoise4, 3);
-        xshift[3] += 0.00118f;
     }
 
     if (mask & 16) {
+        xshift[4] += 0.00127f * timedelta;
         drawCloud(mat1, NAMED_Tnoise5, 4);
-        xshift[4] += 0.00127f;
     }
 
     // Make sure the texture coordinates don't continuously increase
@@ -100,14 +108,6 @@ void drawClouds(float* ident) {
             xshift[i] -= 1.f;
         }
     }
-    if (State->mRotate != 0) {
-        rotation[0] += 0.10;
-        rotation[1] += 0.102f;
-        rotation[2] += 0.106f;
-        rotation[3] += 0.114f;
-        rotation[4] += 0.123f;
-    }
-
     // Make sure the rotation angles don't continuously increase
     for(i = 0; i < 5; i++) {
         while (rotation[i] >= 360.f) {
@@ -263,6 +263,8 @@ void init() {
     scale[4] = 4.2f;
 
     currentpreset = -1;
+    lastuptime = uptimeMillis();
+    timedelta = 0;
 }
 
 
@@ -282,6 +284,15 @@ int main(int launchID) {
     } else {
         bindProgramStore(NAMED_PFSBackgroundSrc);
     }
+
+    int now = uptimeMillis();
+    timedelta = ((float)(now - lastuptime)) / 44.f;
+    lastuptime = now;
+    if (timedelta > 100) {
+        // If we didn't render anything for several seconds, just pretend time stopped.
+        timedelta = 1;
+    }
+
     i = State->mPreset;
     if (i != currentpreset) {
         currentpreset = i;