Remove a bunch of OS(MACOSX) code

sky/engine/core/html/canvas/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 2004 matching lines @@
     WebGLTexture* tex = validateTextureBinding("generateMipmap", target, false);
     if (!tex)
         return;
     if (!tex->canGenerateMipmaps()) {
         synthesizeGLError(GL_INVALID_OPERATION, "generateMipmap", "level 0 not power of 2 or not all the same size");
         return;
     }
     if (!validateSettableTexFormat("generateMipmap", tex->getInternalFormat(target, 0)))
         return;
 
-    // generateMipmap won't work properly if minFilter is not NEAREST_MIPMAP_LINEAR
-    // on Mac.  Remove the hack once this driver bug is fixed.
-#if OS(MACOSX)
-    bool needToResetMinFilter = false;
-    if (tex->getMinFilter() != GL_NEAREST_MIPMAP_LINEAR) {
-        webContext()->texParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
-        needToResetMinFilter = true;
-    }
-#endif
     webContext()->generateMipmap(target);
-#if OS(MACOSX)
-    if (needToResetMinFilter)
-        webContext()->texParameteri(target, GL_TEXTURE_MIN_FILTER, tex->getMinFilter());
-#endif
     tex->generateMipmapLevelInfo();
 }
 
 PassRefPtr<WebGLActiveInfo> WebGLRenderingContextBase::getActiveAttrib(WebGLProgram* program, GLuint index)
 {
     if (isContextLost() || !validateWebGLObject("getActiveAttrib", program))
         return nullptr;
     blink::WebGraphicsContext3D::ActiveInfo info;
     if (!webContext()->getActiveAttrib(objectOrZero(program), index, info))
         return nullptr;
@@ skipping 1079 matching lines @@
         return;
     }
 
     clearIfComposited();
     void* data = pixels->baseAddress();
 
     {
         ScopedDrawingBufferBinder binder(drawingBuffer(), m_framebufferBinding.get());
         webContext()->readPixels(x, y, width, height, format, type, data);
     }
-
-#if OS(MACOSX)
-    // FIXME: remove this section when GL driver bug on Mac is fixed, i.e.,
-    // when alpha is off, readPixels should set alpha to 255 instead of 0.
-    if (!m_framebufferBinding && !drawingBuffer()->getActualAttributes().alpha) {
-        unsigned char* pixels = reinterpret_cast<unsigned char*>(data);
-        for (GLsizei iy = 0; iy < height; ++iy) {
-            for (GLsizei ix = 0; ix < width; ++ix) {
-                pixels[3] = 255;
-                pixels += 4;
-            }
-            pixels += padding;
-        }
-    }
-#endif
 }
 
 void WebGLRenderingContextBase::renderbufferStorage(GLenum target, GLenum internalformat, GLsizei width, GLsizei height)
 {
     if (isContextLost())
         return;
     if (target != GL_RENDERBUFFER) {
         synthesizeGLError(GL_INVALID_ENUM, "renderbufferStorage", "invalid target");
         return;
     }
@@ skipping 2516 matching lines @@
     return m_sharedWebGraphicsContext3D ? m_sharedWebGraphicsContext3D->drawingBuffer() : 0;
 }
 #else
 DrawingBuffer* WebGLRenderingContextBase::drawingBuffer() const
 {
     return m_drawingBuffer.get();
 }
 #endif
 
 } // namespace blink