sync latest fix from desktop gl

Author: codeanticode

core/src/processing/opengl/PGraphicsOpenGL.java

@@ -6250,11 +6250,15 @@ protected PImage wrapTexture(Texture tex) {
 
   protected void updateTexture(PImage img, Texture tex) {
     if (tex != null) {
-      int x = img.getModifiedX1();
-      int y = img.getModifiedY1();
-      int w = img.getModifiedX2() - x;
-      int h = img.getModifiedY2() - y;
-      tex.set(img.pixels, x, y, w, h, img.format);
+      if (img.isModified()) {
+        int x = img.getModifiedX1();
+        int y = img.getModifiedY1();
+        int w = img.getModifiedX2() - x;
+        int h = img.getModifiedY2() - y;
+        tex.set(img.pixels, x, y, w, h, img.format);
+      } else if (img.isLoaded()) {
+        tex.set(img.pixels, 0, 0, img.width, img.height, img.format);
+      }
     }
     img.setModified(false);
     img.setLoaded(false);

core/src/processing/opengl/Texture.java

@@ -329,8 +329,7 @@ public void set(int[] pixels, int x, int y, int w, int h, int format) {
       return;
     }
 
-    if (pixels.length == 0) {
-      // Nothing to do (means that w == h == 0) but not an erroneous situation
+    if (pixels.length == 0 || w == 0 || h == 0) {
       return;
     }
 
@@ -1267,7 +1266,7 @@ protected void copyTexture(Texture tex, int x, int y, int w, int h,
     pg.setFramebuffer(tempFbo);
     // Clear the color buffer to make sure that the alpha channel is set to
     // full transparency
-    pgl.clearColor(1, 1, 1, 1);
+    pgl.clearColor(0, 0, 0, 0);
     pgl.clear(PGL.COLOR_BUFFER_BIT);
     if (scale) {
       // Rendering tex into "this", and scaling the source rectangle