Remove WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG (#20925)

See #7459

Author: sbc100

ChangeLog.md

@@ -20,6 +20,9 @@ See docs/process.md for more on how version tagging works.
 
 3.1.52 (in development)
 -----------------------
+- The WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG setting was
+  removed.  This was a workaround from 2018 (#7459) that should no longer be
+  needed. (#20925)
 - The `--default-obj-ext` command line flag was removed. (#20917)
 - emcc will now treat `.bc` files as source files.  These means that will get
   compiled by clang before being passed to the linker.  This matches the

src/library_webgl.js

@@ -1065,41 +1065,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
         GLctx: ctx
       };
 
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      context.cannotHandleOffsetsInUniformArrayViews = (function(g) {
-        function b(c, t) {
-          var s = g.createShader(t);
-          g.shaderSource(s, c);
-          g.compileShader(s);
-          return s;
-        }
-        try {
-          // Note: we do not delete this program so it stays part of the context
-          // we created, but that is ok - it does not do anything and we want to
-          // keep this detection size minimal.
-          var p = g.createProgram();
-          g.attachShader(p, b("attribute vec4 p;void main(){gl_Position=p;}", 0x8B31 /*GL_VERTEX_SHADER*/));
-          g.attachShader(p, b("precision lowp float;uniform vec4 u;void main(){gl_FragColor=u;}", 0x8B30 /*GL_FRAGMENT_SHADER*/));
-          g.linkProgram(p);
-          var h = new Float32Array(8);
-          h[4] = 1;
-          g.useProgram(p);
-          var l = g.getUniformLocation(p, "u");
-          // Uploading a 4-vector GL uniform from last four elements of array
-          // [0,0,0,0,1,0,0,0], i.e. uploading vec4=(1,0,0,0) at offset=4.
-          g.uniform4fv(l, h.subarray(4, 8));
-          // in proper WebGL we expect to read back the vector we just uploaded:
-          // (1,0,0,0). On buggy browser would instead have uploaded offset=0 of
-          // above array, i.e. vec4=(0,0,0,0)
-          return !g.getUniform(p, l)[0];i
-        } catch(e) {
-          // If we get an exception, we assume we got some other error, and do
-          // not trigger this workaround.
-          return false;
-        }
-      })();
-#endif
-
       // Store the created context object so that we can access the context
       // given a canvas without having to pass the parameters again.
       if (ctx.canvas) ctx.canvas.GLctxObject = context;
@@ -2515,9 +2480,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('32', 'value', 'value+count*4') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Int32Array(view);
-#endif
     }
     GLctx.uniform1iv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2560,9 +2522,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('32', 'value', 'value+count*8') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Int32Array(view);
-#endif
     }
     GLctx.uniform2iv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2606,9 +2565,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('32', 'value', 'value+count*12') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Int32Array(view);
-#endif
     }
     GLctx.uniform3iv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2655,9 +2611,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('32', 'value', 'value+count*16') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Int32Array(view);
-#endif
     }
     GLctx.uniform4iv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2699,9 +2652,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*4') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniform1fv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2746,9 +2696,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*8') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniform2fv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2794,9 +2741,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*12') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniform3fv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2847,9 +2791,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*16') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniform4fv(webglGetUniformLocation(location), view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2896,9 +2837,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*16') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniformMatrix2fv(webglGetUniformLocation(location), !!transpose, view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -2950,9 +2888,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*36') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniformMatrix3fv(webglGetUniformLocation(location), !!transpose, view);
 #endif // MIN_WEBGL_VERSION >= 2
@@ -3015,9 +2950,6 @@ for (/**@suppress{duplicate}*/var i = 0; i < {{{ GL_POOL_TEMP_BUFFERS_SIZE }}};
 #endif
     {
       var view = {{{ makeHEAPView('F32', 'value', 'value+count*64') }}};
-#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
-      if (GL.currentContext.cannotHandleOffsetsInUniformArrayViews) view = new Float32Array(view);
-#endif
     }
     GLctx.uniformMatrix4fv(webglGetUniformLocation(location), !!transpose, view);
 #endif // MIN_WEBGL_VERSION >= 2

src/settings.js

@@ -492,13 +492,6 @@ var GL_SUPPORT_EXPLICIT_SWAP_CONTROL = false;
 // [link]
 var GL_POOL_TEMP_BUFFERS = true;
 
-// Some old Android WeChat (Chromium 37?) browser has a WebGL bug that it ignores
-// the offset of a typed array view pointing to an ArrayBuffer. Set this to
-// 1 to enable a polyfill that works around the issue when it appears. This
-// bug is only relevant to WebGL 1, the affected browsers do not support WebGL 2.
-// [link]
-var WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG = false;
-
 // If true, enables support for the EMSCRIPTEN_explicit_uniform_location WebGL
 // extension. See docs/EMSCRIPTEN_explicit_uniform_location.txt
 var GL_EXPLICIT_UNIFORM_LOCATION = false;
@@ -611,7 +604,6 @@ var POLYFILL_OLD_MATH_FUNCTIONS = false;
 // the highest possible probability of the code working everywhere, even in rare old
 // browsers and shell environments. Specifically:
 //  * Add polyfilling for Math.clz32, Math.trunc, Math.imul, Math.fround. (-sPOLYFILL_OLD_MATH_FUNCTIONS)
-//  * Work around old Chromium WebGL 1 bug (-sWORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG)
 //  * Disable WebAssembly. (Must be paired with -sWASM=0)
 //  * Adjusts MIN_X_VERSION settings to 0 to include support for all browser versions.
 //  * Avoid TypedArray.fill, if necessary, in zeroMemory utility function.
@@ -2159,4 +2151,5 @@ var LEGACY_SETTINGS = [
   ['RUNTIME_LOGGING', 'RUNTIME_DEBUG'],
   ['MIN_EDGE_VERSION', [0x7FFFFFFF], 'No longer supported'],
   ['MIN_IE_VERSION', [0x7FFFFFFF], 'No longer supported'],
+  ['WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG', [0], 'No longer supported'],
 ];

test/test_browser.py

@@ -2794,7 +2794,7 @@ def test_webgl_unmasked_vendor_webgl(self):
   @requires_graphics_hardware
   @parameterized({
     'legacy_browser': (['-sMIN_CHROME_VERSION=0', '-Wno-transpile'],),
-    'closure': (['-O2', '-g1', '--closure=1', '-sWORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG'],),
+    'closure': (['-O2', '-g1', '--closure=1'],),
     'full_es2': (['-sFULL_ES2'],),
   })
   def test_webgl2(self, args):
@@ -4750,11 +4750,6 @@ def test_webgl_offscreen_framebuffer_state_restoration(self):
       cmd = args + ['-lGL', '-sOFFSCREEN_FRAMEBUFFER', '-DEXPLICIT_SWAP=1']
       self.btest_exit('webgl_offscreen_framebuffer_swap_with_bad_state.c', args=cmd)
 
-  # Tests that -sWORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG rendering works.
-  @requires_graphics_hardware
-  def test_webgl_workaround_webgl_uniform_upload_bug(self):
-    self.btest_exit('webgl_draw_triangle_with_uniform_color.c',  args=['-lGL', '-sWORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG'])
-
   # Tests that using an array of structs in GL uniforms works.
   @requires_graphics_hardware
   def test_webgl_array_of_structs_uniform(self):

tools/link.py

@@ -1101,9 +1101,6 @@ def phase_linker_setup(options, state, newargs):
     settings.MIN_CHROME_VERSION = 0
     settings.MIN_NODE_VERSION = 0
 
-  if settings.MIN_CHROME_VERSION <= 37:
-    settings.WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG = 1
-
   # 10.19.0 is the oldest version of node that we do any testing with.
   # Keep this in sync with the test-node-compat in .circleci/config.yml
   # and MINIMUM_NODE_VERSION in tools/shared.py
@@ -1153,7 +1150,6 @@ def phase_linker_setup(options, state, newargs):
   # Silently drop any individual backwards compatibility emulation flags that are known never to occur on browsers that support WebAssembly.
   if not settings.WASM2JS:
     settings.POLYFILL_OLD_MATH_FUNCTIONS = 0
-    settings.WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG = 0
 
   if settings.STB_IMAGE and final_suffix in EXECUTABLE_ENDINGS:
     state.forced_stdlibs.append('libstb_image')