Remove transform feedback validation in Blink

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 2221 matching lines @@
 void WebGLRenderingContextBase::drawElements(GLenum mode, GLsizei count, GLenum type, long long offset)
 {
     if (!validateDrawElements("drawElements", type, offset))
         return;
 
     if (!m_boundVertexArrayObject->isAllEnabledAttribBufferBound()) {
         synthesizeGLError(GL_INVALID_OPERATION, "drawElements", "no buffer is bound to enabled attribute");
         return;
     }
 
-    if (transformFeedbackActive() && !transformFeedbackPaused()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "drawElements", "transform feedback is active and not paused");
-        return;
-    }
-
     ScopedRGBEmulationColorMask emulationColorMask(contextGL(), m_colorMask, m_drawingBuffer.get());
     clearIfComposited();
     contextGL()->DrawElements(mode, count, type, reinterpret_cast<void*>(static_cast<intptr_t>(offset)));
     markContextChanged(CanvasChanged);
 }
 
 void WebGLRenderingContextBase::drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount)
 {
     if (!validateDrawArrays("drawArraysInstancedANGLE"))
         return;
@@ skipping 2660 matching lines @@
     bool deleted;
     if (!checkObjectToBeBound("useProgram", program, deleted))
         return;
     if (deleted)
         program = 0;
     if (program && !program->linkStatus(this)) {
         synthesizeGLError(GL_INVALID_OPERATION, "useProgram", "program not valid");
         return;
     }
 
-    if (transformFeedbackActive() && !transformFeedbackPaused()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "useProgram", "transform feedback is active and not paused");
-        return;
-    }
-
     if (m_currentProgram != program) {
         if (m_currentProgram)
             m_currentProgram->onDetached(contextGL());
         m_currentProgram = program;
         contextGL()->UseProgram(objectOrZero(program));
         if (program)
             program->onAttached();
         preserveObjectWrapper(scriptState, this, V8HiddenValue::webglMisc(scriptState->isolate()), &m_miscWrappers, static_cast<uint32_t>(PreservedProgram), program);
     }
 }
@@ skipping 1493 matching lines @@
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, 1);
 }
 
 void WebGLRenderingContextBase::restoreUnpackParameters()
 {
     if (m_unpackAlignment != 1)
         contextGL()->PixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
 }
 
 } // namespace blink