Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/command_buffer/SkCommandBufferGLContext.cpp

Index: src/gpu/gl/command_buffer/SkCommandBufferGLContext.cpp
diff --git a/src/gpu/gl/command_buffer/SkCommandBufferGLContext.cpp b/src/gpu/gl/command_buffer/SkCommandBufferGLContext.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..516c155fcc984d8f9132c9979fab6cbe3ab4e271
--- /dev/null
+++ b/src/gpu/gl/command_buffer/SkCommandBufferGLContext.cpp
@@ -0,0 +1,338 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+#include "SkOnce.h"
+#include "gl/GrGLInterface.h"
+#include "gl/GrGLAssembleInterface.h"
+#include "gl/command_buffer/SkCommandBufferGLContext.h"
+#include "../ports/SkOSEnvironment.h"
+#include "../ports/SkOSLibrary.h"
+
+#if defined SK_BUILD_FOR_MAC
+
+// EGL doesn't exist on the mac, so expose what we need to get the command buffer's EGL running.
+typedef void *EGLDisplay;
+typedef unsigned int EGLBoolean;
+typedef void *EGLConfig;
+typedef void *EGLSurface;
+typedef void *EGLContext;
+typedef int32_t EGLint;
+typedef void* EGLNativeDisplayType;
+typedef void* EGLNativeWindowType;
+typedef void (*__eglMustCastToProperFunctionPointerType)(void);
+#define EGL_FALSE 0
+#define EGL_OPENGL_ES2_BIT 0x0004
+#define EGL_CONTEXT_CLIENT_VERSION 0x3098
+#define EGL_NO_SURFACE ((EGLSurface)0)
+#define EGL_NO_DISPLAY ((EGLDisplay)0)
+#define EGL_NO_CONTEXT ((EGLContext)0)
+#define EGL_DEFAULT_DISPLAY ((EGLNativeDisplayType)0)
+#define EGL_SURFACE_TYPE 0x3033
+#define EGL_PBUFFER_BIT 0x0001
+#define EGL_RENDERABLE_TYPE 0x3040
+#define EGL_RED_SIZE 0x3024
+#define EGL_GREEN_SIZE 0x3023
+#define EGL_BLUE_SIZE 0x3022
+#define EGL_ALPHA_SIZE 0x3021
+#define EGL_DEPTH_SIZE 0x3025
+#define EGL_STENCIL_SIZE 0x3025
+#define EGL_SAMPLES 0x3031
+#define EGL_SAMPLE_BUFFERS 0x3032
+#define EGL_NONE 0x3038
+#define EGL_WIDTH 0x3057
+#define EGL_HEIGHT 0x3056
+
+#else
+
+#include <EGL/egl.h>
+
+#endif
+
+typedef EGLDisplay (*GetDisplayProc)(EGLNativeDisplayType display_id);
+typedef EGLBoolean (*InitializeProc)(EGLDisplay dpy, EGLint *major, EGLint *minor);
+typedef EGLBoolean (*TerminateProc)(EGLDisplay dpy);
+typedef EGLBoolean (*ChooseConfigProc)(EGLDisplay dpy, const EGLint* attrib_list, EGLConfig* configs, EGLint config_size, EGLint* num_config);
+typedef EGLBoolean (*GetConfigAttrib)(EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint* value);
+typedef EGLSurface (*CreateWindowSurfaceProc)(EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint* attrib_list);
+typedef EGLSurface (*CreatePbufferSurfaceProc)(EGLDisplay dpy, EGLConfig config, const EGLint* attrib_list);
+typedef EGLBoolean (*DestroySurfaceProc)(EGLDisplay dpy, EGLSurface surface);
+typedef EGLContext (*CreateContextProc)(EGLDisplay dpy, EGLConfig config, EGLContext share_context, const EGLint* attrib_list);
+typedef EGLBoolean (*DestroyContextProc)(EGLDisplay dpy, EGLContext ctx);
+typedef EGLBoolean (*MakeCurrentProc)(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx);
+typedef EGLBoolean (*SwapBuffersProc)(EGLDisplay dpy, EGLSurface surface);
+typedef __eglMustCastToProperFunctionPointerType (*GetProcAddressProc)(const char* procname);
+
+static GetDisplayProc gfGetDisplay = nullptr;
+static InitializeProc gfInitialize = nullptr;
+static TerminateProc gfTerminate = nullptr;
+static ChooseConfigProc gfChooseConfig = nullptr;
+static GetConfigAttrib gfGetConfigAttrib = nullptr;
+static CreateWindowSurfaceProc gfCreateWindowSurface = nullptr;
+static CreatePbufferSurfaceProc gfCreatePbufferSurface = nullptr;
+static DestroySurfaceProc gfDestroySurface = nullptr;
+static CreateContextProc gfCreateContext = nullptr;
+static DestroyContextProc gfDestroyContext = nullptr;
+static MakeCurrentProc gfMakeCurrent = nullptr;
+static SwapBuffersProc gfSwapBuffers = nullptr;
+static GetProcAddressProc gfGetProcAddress = nullptr;
+
+static void* gLibrary = nullptr;
+static bool gfFunctionsLoadedSuccessfully = false;
+
+static void load_command_buffer_functions() {
+    if (!gLibrary) {
+#if defined _WIN32
+        gLibrary = DynamicLoadLibrary("command_buffer_gles2.dll");
+#elif defined SK_BUILD_FOR_MAC
+        gLibrary = DynamicLoadLibrary("libcommand_buffer_gles2.dylib");
+#else
+        gLibrary = DynamicLoadLibrary("libcommand_buffer_gles2.so");
+#endif // defined _WIN32
+        if (gLibrary) {
+            gfGetDisplay = (GetDisplayProc)GetProcedureAddress(gLibrary, "eglGetDisplay");
+            gfInitialize = (InitializeProc)GetProcedureAddress(gLibrary, "eglInitialize");
+            gfTerminate = (TerminateProc)GetProcedureAddress(gLibrary, "eglTerminate");
+            gfChooseConfig = (ChooseConfigProc)GetProcedureAddress(gLibrary, "eglChooseConfig");
+            gfGetConfigAttrib = (GetConfigAttrib)GetProcedureAddress(gLibrary, "eglGetConfigAttrib");
+            gfCreateWindowSurface = (CreateWindowSurfaceProc)GetProcedureAddress(gLibrary, "eglCreateWindowSurface");
+            gfCreatePbufferSurface = (CreatePbufferSurfaceProc)GetProcedureAddress(gLibrary, "eglCreatePbufferSurface");
+            gfDestroySurface = (DestroySurfaceProc)GetProcedureAddress(gLibrary, "eglDestroySurface");
+            gfCreateContext = (CreateContextProc)GetProcedureAddress(gLibrary, "eglCreateContext");
+            gfDestroyContext = (DestroyContextProc)GetProcedureAddress(gLibrary, "eglDestroyContext");
+            gfMakeCurrent = (MakeCurrentProc)GetProcedureAddress(gLibrary, "eglMakeCurrent");
+            gfSwapBuffers = (SwapBuffersProc)GetProcedureAddress(gLibrary, "eglSwapBuffers");
+            gfGetProcAddress = (GetProcAddressProc)GetProcedureAddress(gLibrary, "eglGetProcAddress");
+
+            gfFunctionsLoadedSuccessfully = gfGetDisplay && gfInitialize && gfTerminate &&
+                                            gfChooseConfig && gfCreateWindowSurface &&
+                                            gfCreatePbufferSurface && gfDestroySurface &&
+                                            gfCreateContext && gfDestroyContext && gfMakeCurrent &&
+                                            gfSwapBuffers && gfGetProcAddress;
+
+        }
+    }
+}
+
+static GrGLFuncPtr command_buffer_get_gl_proc(void* ctx, const char name[]) {
+    if (!gfFunctionsLoadedSuccessfully) {
+        return nullptr;
+    }
+    return gfGetProcAddress(name);
+}
+
+SK_DECLARE_STATIC_ONCE(loadCommandBufferOnce);
+void LoadCommandBufferOnce() {
+    SkOnce(&loadCommandBufferOnce, load_command_buffer_functions);
+}
+
+const GrGLInterface* GrGLCreateCommandBufferInterface() {
+    LoadCommandBufferOnce();
+    if (!gfFunctionsLoadedSuccessfully) {
+        return nullptr;
+    }
+    return GrGLAssembleGLESInterface(gLibrary, command_buffer_get_gl_proc);
+}
+
+SkCommandBufferGLContext::SkCommandBufferGLContext()
+    : fContext(EGL_NO_CONTEXT)
+    , fDisplay(EGL_NO_DISPLAY)
+    , fSurface(EGL_NO_SURFACE) {
+
+    static const EGLint configAttribs[] = {
+        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+        EGL_RED_SIZE, 8,
+        EGL_GREEN_SIZE, 8,
+        EGL_BLUE_SIZE, 8,
+        EGL_ALPHA_SIZE, 8,
+        EGL_NONE
+    };
+
+    static const EGLint surfaceAttribs[] = {
+        EGL_WIDTH, 1,
+        EGL_HEIGHT, 1,
+        EGL_NONE
+    };
+
+    initializeGLContext(nullptr, configAttribs, surfaceAttribs);
+}
+
+SkCommandBufferGLContext::SkCommandBufferGLContext(void* nativeWindow, int msaaSampleCount) {
+    static const EGLint surfaceAttribs[] = { EGL_NONE };
+
+    EGLint configAttribs[] = {
+        EGL_RED_SIZE,       8,
+        EGL_GREEN_SIZE,     8,
+        EGL_BLUE_SIZE,      8,
+        EGL_ALPHA_SIZE,     8,
+        EGL_DEPTH_SIZE,     8,
+        EGL_STENCIL_SIZE,   8,
+        EGL_SAMPLE_BUFFERS, 1,
+        EGL_SAMPLES,        msaaSampleCount,
+        EGL_NONE
+    };
+    if (msaaSampleCount == 0) {
+        configAttribs[12] = EGL_NONE;
+    }
+
+    initializeGLContext(nativeWindow, configAttribs, surfaceAttribs);
+}
+
+void SkCommandBufferGLContext::initializeGLContext(void* nativeWindow, const int* configAttribs,
+                                                   const int* surfaceAttribs) {
+    LoadCommandBufferOnce();
+    if (!gfFunctionsLoadedSuccessfully) {
+        SkDebugf("Command Buffer: Could not load EGL functions.\n");
+        return;
+    }
+
+    // Make sure CHROMIUM_path_rendering is enabled for NVPR support.
+    sk_setenv("CHROME_COMMAND_BUFFER_GLES2_ARGS", "--enable-gl-path-rendering");
+    fDisplay = gfGetDisplay(EGL_DEFAULT_DISPLAY);
+    if (EGL_NO_DISPLAY == fDisplay) {
+        SkDebugf("Command Buffer: Could not create EGL display.\n");
+        return;
+    }
+
+    EGLint majorVersion;
+    EGLint minorVersion;
+    if (!gfInitialize(fDisplay, &majorVersion, &minorVersion)) {
+        SkDebugf("Command Buffer: Could not initialize EGL display.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    EGLint numConfigs;
+    if (!gfChooseConfig(fDisplay, configAttribs, static_cast<EGLConfig*>(&fConfig), 1,
+                        &numConfigs) || numConfigs != 1) {
+        SkDebugf("Command Buffer: Could not choose EGL config.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    if (nativeWindow) {
+        fSurface = gfCreateWindowSurface(fDisplay,
+                                         static_cast<EGLConfig>(fConfig),
+                                         (EGLNativeWindowType)nativeWindow,
+                                         surfaceAttribs);
+    } else {
+        fSurface = gfCreatePbufferSurface(fDisplay,
+                                          static_cast<EGLConfig>(fConfig),
+                                          surfaceAttribs);
+    }
+    if (EGL_NO_SURFACE == fSurface) {
+        SkDebugf("Command Buffer: Could not create EGL surface.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    static const EGLint contextAttribs[] = {
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+        EGL_NONE
+    };
+    fContext = gfCreateContext(fDisplay, static_cast<EGLConfig>(fConfig), nullptr, contextAttribs);
+    if (EGL_NO_CONTEXT == fContext) {
+        SkDebugf("Command Buffer: Could not create EGL context.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    if (!gfMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
+        SkDebugf("Command Buffer: Could not make EGL context current.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    SkAutoTUnref<const GrGLInterface> gl(GrGLCreateCommandBufferInterface());
+    if (nullptr == gl.get()) {
+        SkDebugf("Command Buffer: Could not create CommandBuffer GL interface.\n");
+        this->destroyGLContext();
+        return;
+    }
+    if (!gl->validate()) {
+        SkDebugf("Command Buffer: Could not validate CommandBuffer GL interface.\n");
+        this->destroyGLContext();
+        return;
+    }
+
+    this->init(gl.release());
+}
+
+SkCommandBufferGLContext::~SkCommandBufferGLContext() {
+    this->teardown();
+    this->destroyGLContext();
+}
+
+void SkCommandBufferGLContext::destroyGLContext() {
+    if (!gfFunctionsLoadedSuccessfully) {
+        return;
+    }
+    if (fDisplay) {
+        gfMakeCurrent(fDisplay, 0, 0, 0);
+
+        if (fContext) {
+            gfDestroyContext(fDisplay, fContext);
+            fContext = EGL_NO_CONTEXT;
+        }
+
+        if (fSurface) {
+            gfDestroySurface(fDisplay, fSurface);
+            fSurface = EGL_NO_SURFACE;
+        }
+
+        gfTerminate(fDisplay);
+        fDisplay = EGL_NO_DISPLAY;
+    }
+}
+
+void SkCommandBufferGLContext::onPlatformMakeCurrent() const {
+    if (!gfFunctionsLoadedSuccessfully) {
+        return;
+    }
+    if (!gfMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
+        SkDebugf("Command Buffer: Could not make EGL context current.\n");
+    }
+}
+
+void SkCommandBufferGLContext::onPlatformSwapBuffers() const {
+    if (!gfFunctionsLoadedSuccessfully) {
+        return;
+    }
+    if (!gfSwapBuffers(fDisplay, fSurface)) {
+        SkDebugf("Command Buffer: Could not complete gfSwapBuffers.\n");
+    }
+}
+
+GrGLFuncPtr SkCommandBufferGLContext::onPlatformGetProcAddress(const char* name) const {
+    if (!gfFunctionsLoadedSuccessfully) {
+        return nullptr;
+    }
+    return gfGetProcAddress(name);
+}
+
+void SkCommandBufferGLContext::presentCommandBuffer() {
+    if (this->gl()) {
+        this->gl()->fFunctions.fFlush();
+    }
+
+    this->onPlatformSwapBuffers();
+}
+
+bool SkCommandBufferGLContext::makeCurrent() {
+    return gfMakeCurrent(fDisplay, fSurface, fSurface, fContext) != EGL_FALSE;
+}
+
+int SkCommandBufferGLContext::getStencilBits() {
+    EGLint result = 0;
+    gfGetConfigAttrib(fDisplay, static_cast<EGLConfig>(fConfig), EGL_STENCIL_SIZE, &result);
+    return result;
+}
+
+int SkCommandBufferGLContext::getSampleCount() {
+    EGLint result = 0;
+    gfGetConfigAttrib(fDisplay, static_cast<EGLConfig>(fConfig), EGL_SAMPLES, &result);
+    return result;
+}