retire USES_GL_EMULATION

Author: hujiajie

src/compiler.js

@@ -169,10 +169,6 @@ EXPORTED_FUNCTIONS = set(EXPORTED_FUNCTIONS);
 EXCEPTION_CATCHING_WHITELIST = set(EXCEPTION_CATCHING_WHITELIST);
 IMPLEMENTED_FUNCTIONS = set(IMPLEMENTED_FUNCTIONS);
 
-// TODO: Implement support for proper preprocessing, e.g. "#if A || B" and "#if defined(A) || defined(B)" to
-// avoid needing this here.
-USES_GL_EMULATION = FULL_ES2 || LEGACY_GL_EMULATION;
-
 DEAD_FUNCTIONS.forEach(function(dead) {
   DEFAULT_LIBRARY_FUNCS_TO_INCLUDE.push(dead.substr(1));
 });

src/library_browser.js

@@ -1188,7 +1188,7 @@ var LibraryBrowser = {
 
       // Signal GL rendering layer that processing of a new frame is about to start. This helps it optimize
       // VBO double-buffering and reduce GPU stalls.
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
       GL.newRenderingFrameStarted();
 #endif
 

src/library_gl.js

@@ -40,7 +40,7 @@ var LibraryGL = {
     syncs: [],
 #endif
 
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
     currArrayBuffer: 0,
     currElementArrayBuffer: 0,
 #endif
@@ -77,7 +77,7 @@ var LibraryGL = {
     unpackAlignment: 4, // default alignment is 4 bytes
 
     init: function() {
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
       GL.createLog2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
 #endif
       GL.miniTempBuffer = new Float32Array(GL.MINI_TEMP_BUFFER_SIZE);
@@ -113,7 +113,7 @@ var LibraryGL = {
     miniTempBuffer: null,
     miniTempBufferViews: [0], // index i has the view of size i+1
 
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
     // When user GL code wants to render from client-side memory, we need to upload the vertex data to a temp VBO
     // for rendering. Maintain a set of temp VBOs that are created-on-demand to appropriate sizes, and never destroyed.
     // Also, for best performance the VBOs are double-buffered, i.e. every second frame we switch the set of VBOs we
@@ -3642,7 +3642,7 @@ var LibraryGL = {
 #endif
     var bufferObj = buffer ? GL.buffers[buffer] : null;
 
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
     if (target == GLctx.ARRAY_BUFFER) {
       GL.currArrayBuffer = buffer;
 #if LEGACY_GL_EMULATION
@@ -4282,7 +4282,7 @@ var LibraryGL = {
 #endif
     GLctx['bindVertexArray'](GL.vaos[vao]);
 #endif
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
     var ibo = GLctx.getParameter(GLctx.ELEMENT_ARRAY_BUFFER_BINDING);
     GL.currElementArrayBuffer = ibo ? (ibo.name | 0) : 0;
 #endif

src/library_vr.js

@@ -195,7 +195,7 @@ var LibraryWebVR = {
         /* Prevent scheduler being called twice when loop is changed */
         display.mainLoop.running = true;
 
-#if USES_GL_EMULATION
+#if FULL_ES2 || LEGACY_GL_EMULATION
         GL.newRenderingFrameStarted();
 #endif