Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module (patchset #13 id:240001 of https://codereview.chromium.org/1815823002/ )

Reason for revert:
red bots

Original issue's description:
> Move SkGLContext and some GrGLInterface implementations to skgputest module
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1815823002
> CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot
>
> Committed: https://skia.googlesource.com/skia/+/fe3456cb006110d045b26ff3f8681b893a757b58

TBR=jvanverth@google.com,bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1845473004

1 files changed, 106 insertions, 0 deletions

diff --git a/src/gpu/gl/iOS/SkCreatePlatformGLContext_iOS.mm b/src/gpu/gl/iOS/SkCreatePlatformGLContext_iOS.mm
new file mode 100644
index 0000000000..54dc59af03
--- /dev/null
+++ b/src/gpu/gl/iOS/SkCreatePlatformGLContext_iOS.mm
@@ -0,0 +1,106 @@
+
+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gl/SkGLContext.h"
+#import <OpenGLES/EAGL.h>
+#include <dlfcn.h>
+
+#define EAGLCTX ((EAGLContext*)(fEAGLContext))
+
+namespace {
+
+class IOSGLContext : public SkGLContext {
+public:
+    IOSGLContext();
+    ~IOSGLContext() override;
+
+private:
+    void destroyGLContext();
+
+    void onPlatformMakeCurrent() const override;
+    void onPlatformSwapBuffers() const override;
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override;
+
+    void* fEAGLContext;
+    void* fGLLibrary;
+};
+
+IOSGLContext::IOSGLContext()
+    : fEAGLContext(NULL)
+    , fGLLibrary(RTLD_DEFAULT) {
+
+    fEAGLContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
+    [EAGLContext setCurrentContext:EAGLCTX];
+
+    SkAutoTUnref<const GrGLInterface> gl(GrGLCreateNativeInterface());
+    if (NULL == gl.get()) {
+        SkDebugf("Failed to create gl interface");
+        this->destroyGLContext();
+        return;
+    }
+    if (!gl->validate()) {
+        SkDebugf("Failed to validate gl interface");
+        this->destroyGLContext();
+        return;
+    }
+
+    fGLLibrary = dlopen(
+        "/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib",
+        RTLD_LAZY);
+
+    this->init(gl.release());
+}
+
+IOSGLContext::~IOSGLContext() {
+    this->teardown();
+    this->destroyGLContext();
+}
+
+void IOSGLContext::destroyGLContext() {
+    if (fEAGLContext) {
+        if ([EAGLContext currentContext] == EAGLCTX) {
+            [EAGLContext setCurrentContext:nil];
+        }
+        [EAGLCTX release];
+        fEAGLContext = NULL;
+    }
+    if (RTLD_DEFAULT != fGLLibrary) {
+        dlclose(fGLLibrary);
+    }
+}
+
+
+void IOSGLContext::onPlatformMakeCurrent() const {
+    if (![EAGLContext setCurrentContext:EAGLCTX]) {
+        SkDebugf("Could not set the context.\n");
+    }
+}
+
+void IOSGLContext::onPlatformSwapBuffers() const { }
+
+GrGLFuncPtr IOSGLContext::onPlatformGetProcAddress(const char* procName) const {
+    return reinterpret_cast<GrGLFuncPtr>(dlsym(fGLLibrary, procName));
+}
+
+} // anonymous namespace
+
+SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI, SkGLContext* shareContext) {
+    SkASSERT(!shareContext);
+    if (shareContext) {
+        return NULL;
+    }
+    if (kGL_GrGLStandard == forcedGpuAPI) {
+        return NULL;
+    }
+    IOSGLContext* ctx = new IOSGLContext;
+    if (!ctx->isValid()) {
+        delete ctx;
+        return NULL;
+    }
+    return ctx;
+}