Revert of Move SkGLContext and some GrGLInterface implementations to skgputest module

src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp

Index: src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
diff --git a/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp b/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1644254c09800852c8b6e869debb501383d69c9a
--- /dev/null
+++ b/src/gpu/gl/egl/SkCreatePlatformGLContext_egl.cpp
@@ -0,0 +1,333 @@
+/*
+ * Copyright 2011 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"
+
+#include <GLES2/gl2.h>
+
+#define EGL_EGLEXT_PROTOTYPES
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include "gl/GrGLDefines.h"
+#include "gl/GrGLUtil.h"
+
+namespace {
+
+// TODO: Share this class with ANGLE if/when it gets support for EGL_KHR_fence_sync.
+class SkEGLFenceSync : public SkGpuFenceSync {
+public:
+    static SkEGLFenceSync* CreateIfSupported(EGLDisplay);
+
+    SkPlatformGpuFence SK_WARN_UNUSED_RESULT insertFence() const override;
+    bool waitFence(SkPlatformGpuFence fence, bool flush) const override;
+    void deleteFence(SkPlatformGpuFence fence) const override;
+
+private:
+    SkEGLFenceSync(EGLDisplay display) : fDisplay(display) {}
+
+    EGLDisplay                    fDisplay;
+
+    typedef SkGpuFenceSync INHERITED;
+};
+
+class EGLGLContext : public SkGLContext  {
+public:
+    EGLGLContext(GrGLStandard forcedGpuAPI);
+    ~EGLGLContext() override;
+
+    GrEGLImage texture2DToEGLImage(GrGLuint texID) const override;
+    void destroyEGLImage(GrEGLImage) const override;
+    GrGLuint eglImageToExternalTexture(GrEGLImage) const override;
+    SkGLContext* createNew() const override;
+
+private:
+    void destroyGLContext();
+
+    void onPlatformMakeCurrent() const override;
+    void onPlatformSwapBuffers() const override;
+    GrGLFuncPtr onPlatformGetProcAddress(const char*) const override;
+
+    EGLContext fContext;
+    EGLDisplay fDisplay;
+    EGLSurface fSurface;
+};
+
+EGLGLContext::EGLGLContext(GrGLStandard forcedGpuAPI)
+    : fContext(EGL_NO_CONTEXT)
+    , fDisplay(EGL_NO_DISPLAY)
+    , fSurface(EGL_NO_SURFACE) {
+    static const EGLint kEGLContextAttribsForOpenGL[] = {
+        EGL_NONE
+    };
+
+    static const EGLint kEGLContextAttribsForOpenGLES[] = {
+        EGL_CONTEXT_CLIENT_VERSION, 2,
+        EGL_NONE
+    };
+
+    static const struct {
+        const EGLint* fContextAttribs;
+        EGLenum fAPI;
+        EGLint  fRenderableTypeBit;
+        GrGLStandard fStandard;
+    } kAPIs[] = {
+        {   // OpenGL
+            kEGLContextAttribsForOpenGL,
+            EGL_OPENGL_API,
+            EGL_OPENGL_BIT,
+            kGL_GrGLStandard
+        },
+        {   // OpenGL ES. This seems to work for both ES2 and 3 (when available).
+            kEGLContextAttribsForOpenGLES,
+            EGL_OPENGL_ES_API,
+            EGL_OPENGL_ES2_BIT,
+            kGLES_GrGLStandard
+        },
+    };
+
+    size_t apiLimit = SK_ARRAY_COUNT(kAPIs);
+    size_t api = 0;
+    if (forcedGpuAPI == kGL_GrGLStandard) {
+        apiLimit = 1;
+    } else if (forcedGpuAPI == kGLES_GrGLStandard) {
+        api = 1;
+    }
+    SkASSERT(forcedGpuAPI == kNone_GrGLStandard || kAPIs[api].fStandard == forcedGpuAPI);
+
+    SkAutoTUnref<const GrGLInterface> gl;
+
+    for (; nullptr == gl.get() && api < apiLimit; ++api) {
+        fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+
+        EGLint majorVersion;
+        EGLint minorVersion;
+        eglInitialize(fDisplay, &majorVersion, &minorVersion);
+
+#if 0
+        SkDebugf("VENDOR: %s\n", eglQueryString(fDisplay, EGL_VENDOR));
+        SkDebugf("APIS: %s\n", eglQueryString(fDisplay, EGL_CLIENT_APIS));
+        SkDebugf("VERSION: %s\n", eglQueryString(fDisplay, EGL_VERSION));
+        SkDebugf("EXTENSIONS %s\n", eglQueryString(fDisplay, EGL_EXTENSIONS));
+#endif
+
+        if (!eglBindAPI(kAPIs[api].fAPI)) {
+            continue;
+        }
+
+        EGLint numConfigs = 0;
+        const EGLint configAttribs[] = {
+            EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+            EGL_RENDERABLE_TYPE, kAPIs[api].fRenderableTypeBit,
+            EGL_RED_SIZE, 8,
+            EGL_GREEN_SIZE, 8,
+            EGL_BLUE_SIZE, 8,
+            EGL_ALPHA_SIZE, 8,
+            EGL_NONE
+        };
+
+        EGLConfig surfaceConfig;
+        if (!eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs)) {
+            SkDebugf("eglChooseConfig failed. EGL Error: 0x%08x\n", eglGetError());
+            continue;
+        }
+
+        if (0 == numConfigs) {
+            SkDebugf("No suitable EGL config found.\n");
+            continue;
+        }
+
+        fContext = eglCreateContext(fDisplay, surfaceConfig, nullptr, kAPIs[api].fContextAttribs);
+        if (EGL_NO_CONTEXT == fContext) {
+            SkDebugf("eglCreateContext failed.  EGL Error: 0x%08x\n", eglGetError());
+            continue;
+        }
+
+        static const EGLint kSurfaceAttribs[] = {
+            EGL_WIDTH, 1,
+            EGL_HEIGHT, 1,
+            EGL_NONE
+        };
+
+        fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, kSurfaceAttribs);
+        if (EGL_NO_SURFACE == fSurface) {
+            SkDebugf("eglCreatePbufferSurface failed. EGL Error: 0x%08x\n", eglGetError());
+            this->destroyGLContext();
+            continue;
+        }
+
+        if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
+            SkDebugf("eglMakeCurrent failed.  EGL Error: 0x%08x\n", eglGetError());
+            this->destroyGLContext();
+            continue;
+        }
+
+        gl.reset(GrGLCreateNativeInterface());
+        if (nullptr == gl.get()) {
+            SkDebugf("Failed to create gl interface.\n");
+            this->destroyGLContext();
+            continue;
+        }
+
+        if (!gl->validate()) {
+            SkDebugf("Failed to validate gl interface.\n");
+            this->destroyGLContext();
+            continue;
+        }
+
+        this->init(gl.release(), SkEGLFenceSync::CreateIfSupported(fDisplay));
+        break;
+    }
+}
+
+EGLGLContext::~EGLGLContext() {
+    this->teardown();
+    this->destroyGLContext();
+}
+
+void EGLGLContext::destroyGLContext() {
+    if (fDisplay) {
+        eglMakeCurrent(fDisplay, 0, 0, 0);
+
+        if (fContext) {
+            eglDestroyContext(fDisplay, fContext);
+            fContext = EGL_NO_CONTEXT;
+        }
+
+        if (fSurface) {
+            eglDestroySurface(fDisplay, fSurface);
+            fSurface = EGL_NO_SURFACE;
+        }
+
+        //TODO should we close the display?
+        fDisplay = EGL_NO_DISPLAY;
+    }
+}
+
+GrEGLImage EGLGLContext::texture2DToEGLImage(GrGLuint texID) const {
+    if (!this->gl()->hasExtension("EGL_KHR_gl_texture_2D_image")) {
+        return GR_EGL_NO_IMAGE;
+    }
+    GrEGLImage img;
+    GrEGLint attribs[] = { GR_EGL_GL_TEXTURE_LEVEL, 0, GR_EGL_NONE };
+    GrEGLClientBuffer clientBuffer = reinterpret_cast<GrEGLClientBuffer>(texID);
+    GR_GL_CALL_RET(this->gl(), img,
+                   EGLCreateImage(fDisplay, fContext, GR_EGL_GL_TEXTURE_2D, clientBuffer, attribs));
+    return img;
+}
+
+void EGLGLContext::destroyEGLImage(GrEGLImage image) const {
+    GR_GL_CALL(this->gl(), EGLDestroyImage(fDisplay, image));
+}
+
+GrGLuint EGLGLContext::eglImageToExternalTexture(GrEGLImage image) const {
+    GrGLClearErr(this->gl());
+    if (!this->gl()->hasExtension("GL_OES_EGL_image_external")) {
+        return 0;
+    }
+    typedef GrGLvoid (*EGLImageTargetTexture2DProc)(GrGLenum, GrGLeglImage);
+
+    EGLImageTargetTexture2DProc glEGLImageTargetTexture2D =
+        (EGLImageTargetTexture2DProc) eglGetProcAddress("glEGLImageTargetTexture2DOES");
+    if (!glEGLImageTargetTexture2D) {
+        return 0;
+    }
+    GrGLuint texID;
+    glGenTextures(1, &texID);
+    if (!texID) {
+        return 0;
+    }
+    glBindTexture(GR_GL_TEXTURE_EXTERNAL, texID);
+    if (glGetError() != GR_GL_NO_ERROR) {
+        glDeleteTextures(1, &texID);
+        return 0;
+    }
+    glEGLImageTargetTexture2D(GR_GL_TEXTURE_EXTERNAL, image);
+    if (glGetError() != GR_GL_NO_ERROR) {
+        glDeleteTextures(1, &texID);
+        return 0;
+    }
+    return texID;
+}
+
+SkGLContext* EGLGLContext::createNew() const {
+    SkGLContext* ctx = SkCreatePlatformGLContext(this->gl()->fStandard);
+    if (ctx) {
+        ctx->makeCurrent();
+    }
+    return ctx;
+}
+
+void EGLGLContext::onPlatformMakeCurrent() const {
+    if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
+        SkDebugf("Could not set the context.\n");
+    }
+}
+
+void EGLGLContext::onPlatformSwapBuffers() const {
+    if (!eglSwapBuffers(fDisplay, fSurface)) {
+        SkDebugf("Could not complete eglSwapBuffers.\n");
+    }
+}
+
+GrGLFuncPtr EGLGLContext::onPlatformGetProcAddress(const char* procName) const {
+    return eglGetProcAddress(procName);
+}
+
+static bool supports_egl_extension(EGLDisplay display, const char* extension) {
+    size_t extensionLength = strlen(extension);
+    const char* extensionsStr = eglQueryString(display, EGL_EXTENSIONS);
+    while (const char* match = strstr(extensionsStr, extension)) {
+        // Ensure the string we found is its own extension, not a substring of a larger extension
+        // (e.g. GL_ARB_occlusion_query / GL_ARB_occlusion_query2).
+        if ((match == extensionsStr || match[-1] == ' ') &&
+            (match[extensionLength] == ' ' || match[extensionLength] == '\0')) {
+            return true;
+        }
+        extensionsStr = match + extensionLength;
+    }
+    return false;
+}
+
+SkEGLFenceSync* SkEGLFenceSync::CreateIfSupported(EGLDisplay display) {
+    if (!display || !supports_egl_extension(display, "EGL_KHR_fence_sync")) {
+        return nullptr;
+    }
+    return new SkEGLFenceSync(display);
+}
+
+SkPlatformGpuFence SkEGLFenceSync::insertFence() const {
+    return eglCreateSyncKHR(fDisplay, EGL_SYNC_FENCE_KHR, nullptr);
+}
+
+bool SkEGLFenceSync::waitFence(SkPlatformGpuFence platformFence, bool flush) const {
+    EGLSyncKHR eglsync = static_cast<EGLSyncKHR>(platformFence);
+    return EGL_CONDITION_SATISFIED_KHR ==
+            eglClientWaitSyncKHR(fDisplay,
+                                 eglsync,
+                                 flush ? EGL_SYNC_FLUSH_COMMANDS_BIT_KHR : 0,
+                                 EGL_FOREVER_KHR);
+}
+
+void SkEGLFenceSync::deleteFence(SkPlatformGpuFence platformFence) const {
+    EGLSyncKHR eglsync = static_cast<EGLSyncKHR>(platformFence);
+    eglDestroySyncKHR(fDisplay, eglsync);
+}
+
+} // anonymous namespace
+
+SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI, SkGLContext* shareContext) {
+    SkASSERT(!shareContext);
+    if (shareContext) {
+        return nullptr;
+    }
+    EGLGLContext* ctx = new EGLGLContext(forcedGpuAPI);
+    if (!ctx->isValid()) {
+        delete ctx;
+        return nullptr;
+    }
+    return ctx;
+}