fix: Clearing cloned textures produces new internal copy when multi references

Author: robertleeplummerjr

dist/gpu-browser-core.js

@@ -4,8 +4,8 @@
  *
  * GPU Accelerated JavaScript
  *
- * @version 2.8.3
- * @date Mon Mar 16 2020 08:42:55 GMT-0400 (Eastern Daylight Time)
+ * @version 2.8.4
+ * @date Mon Mar 16 2020 10:58:11 GMT-0400 (Eastern Daylight Time)
  *
  * @license MIT
  * The MIT License
@@ -5591,7 +5591,16 @@ class GLTexture extends Texture {
   }
 
   clear() {
-    const { context: gl, size, texture } = this;
+    if (this.texture._refs) {
+      this.texture._refs--;
+      const gl = this.context;
+      const target = this.texture = gl.createTexture();
+      selectTexture(gl, target);
+      const size = this.size;
+      target._refs = 1;
+      gl.texImage2D(gl.TEXTURE_2D, 0, this.internalFormat, size[0], size[1], 0, this.textureFormat, this.textureType, null);
+    }
+    const { context: gl, texture } = this;
     gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer());
     gl.bindTexture(gl.TEXTURE_2D, texture);
     selectTexture(gl, texture);

dist/gpu-browser-core.min.js

@@ -4,8 +4,8 @@
  *
  * GPU Accelerated JavaScript
  *
- * @version 2.8.3
- * @date Mon Mar 16 2020 08:42:55 GMT-0400 (Eastern Daylight Time)
+ * @version 2.8.4
+ * @date Mon Mar 16 2020 10:58:11 GMT-0400 (Eastern Daylight Time)
  *
  * @license MIT
  * The MIT License
@@ -10044,7 +10044,16 @@ class GLTexture extends Texture {
   }
 
   clear() {
-    const { context: gl, size, texture } = this;
+    if (this.texture._refs) {
+      this.texture._refs--;
+      const gl = this.context;
+      const target = this.texture = gl.createTexture();
+      selectTexture(gl, target);
+      const size = this.size;
+      target._refs = 1;
+      gl.texImage2D(gl.TEXTURE_2D, 0, this.internalFormat, size[0], size[1], 0, this.textureFormat, this.textureType, null);
+    }
+    const { context: gl, texture } = this;
     gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer());
     gl.bindTexture(gl.TEXTURE_2D, texture);
     selectTexture(gl, texture);

dist/gpu-browser.js

@@ -1,6 +1,6 @@
 {
   "name": "gpu.js",
-  "version": "2.8.3",
+  "version": "2.8.4",
   "description": "GPU Accelerated JavaScript",
   "engines": {
     "node": ">=8.0.0"

dist/gpu-browser.min.js

@@ -49,7 +49,16 @@ class GLTexture extends Texture {
   }
 
   clear() {
-    const { context: gl, size, texture } = this;
+    if (this.texture._refs) {
+      this.texture._refs--;
+      const gl = this.context;
+      const target = this.texture = gl.createTexture();
+      selectTexture(gl, target);
+      const size = this.size;
+      target._refs = 1;
+      gl.texImage2D(gl.TEXTURE_2D, 0, this.internalFormat, size[0], size[1], 0, this.textureFormat, this.textureType, null);
+    }
+    const { context: gl, texture } = this;
     gl.bindFramebuffer(gl.FRAMEBUFFER, this.framebuffer());
     gl.bindTexture(gl.TEXTURE_2D, texture);
     selectTexture(gl, texture);

package-lock.json

@@ -54,3 +54,41 @@ test('unsigned precision auto', () => {
 (GPU.isSinglePrecisionSupported && GPU.isHeadlessGLSupported ? test : skip)('single precision headlessgl', () => {
   clearTexture('single', 'headlessgl');
 });
+
+
+function clearClonedTexture(mode) {
+  const gpu = new GPU({ mode });
+  const kernel = gpu.createKernel(function() {
+    return 1;
+  }, { output: [1], pipeline: true, immutable: true });
+  const result = kernel();
+  assert.equal(result.toArray()[0], 1);
+  const result2 = result.clone();
+  const result3 = result2.clone();
+  assert.equal(result2.toArray()[0], 1);
+  assert.equal(result3.toArray()[0], 1);
+  result2.clear();
+  assert.equal(result2.toArray()[0], 0);
+  assert.equal(result3.toArray()[0], 1);
+  gpu.destroy();
+}
+
+test('clear cloned texture auto', () => {
+  clearClonedTexture();
+});
+
+test('clear cloned texture gpu', () => {
+  clearClonedTexture('gpu');
+});
+
+(GPU.isWebGLSupported ? test : skip)('clear cloned texture webgl', () => {
+  clearClonedTexture('webgl');
+});
+
+(GPU.isWebGL2Supported ? test : skip)('clear cloned texture webgl2', () => {
+  clearClonedTexture('webgl2');
+});
+
+(GPU.isHeadlessGLSupported ? test : skip)('clear cloned texture headlessgl', () => {
+  clearClonedTexture('headlessgl');
+});