Move SkGLContext and some GrGLInterface implementations to skgputest module

include/gpu/gl/SkGLContext.h

-
-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#ifndef SkGLContext_DEFINED
-#define SkGLContext_DEFINED
-
-#include "GrGLInterface.h"
-#include "../private/SkGpuFenceSync.h"
-
-/**
- * Create an offscreen opengl context with an RGBA8 / 8bit stencil FBO.
- * Provides a GrGLInterface struct of function pointers for the context.
- * This class is intended for Skia's testing needs and not for general
- * use.
- */
-class SK_API SkGLContext : public SkNoncopyable {
-public:
-    virtual ~SkGLContext();
-
-    bool isValid() const { return NULL != gl(); }
-
-    const GrGLInterface* gl() const { return fGL.get(); }
-
-    bool fenceSyncSupport() const { return fFenceSync != nullptr; }
-
-    bool getMaxGpuFrameLag(int* maxFrameLag) const {
-        if (!fFenceSync) {
-            return false;
-        }
-        *maxFrameLag = kMaxFrameLag;
-        return true;
-    }
-
-    void makeCurrent() const;
-
-    /** Used for testing EGLImage integration. Take a GL_TEXTURE_2D and wraps it in an EGL Image */
-    virtual GrEGLImage texture2DToEGLImage(GrGLuint /*texID*/) const { return 0; }
-    virtual void destroyEGLImage(GrEGLImage) const {}
-
-    /** Used for testing GL_TEXTURE_RECTANGLE integration. */
-    GrGLint createTextureRectangle(int width, int height, GrGLenum internalFormat,
-                                   GrGLenum externalFormat, GrGLenum externalType,
-                                   GrGLvoid* data);
-
-    /**
-     * Used for testing EGLImage integration. Takes a EGLImage and wraps it in a
-     * GL_TEXTURE_EXTERNAL_OES.
-     */
-    virtual GrGLuint eglImageToExternalTexture(GrEGLImage) const { return 0; }
-
-    void swapBuffers();
-
-    /**
-     * The only purpose of this function it to provide a means of scheduling
-     * work on the GPU (since all of the subclasses create primary buffers for
-     * testing that are small and not meant to be rendered to the screen).
-     *
-     * If the platform supports fence sync (OpenGL 3.2+ or EGL_KHR_fence_sync),
-     * this will not swap any buffers, but rather emulate triple buffer
-     * synchronization using fences.
-     *
-     * Otherwise it will call the platform SwapBuffers method. This may or may
-     * not perform some sort of synchronization, depending on whether the
-     * drawing surface provided by the platform is double buffered.
-     */
-    void waitOnSyncOrSwap();
-
-    /**
-     * This notifies the context that we are deliberately testing abandoning
-     * the context. It is useful for debugging contexts that would otherwise
-     * test that GPU resources are properly deleted. It also allows a debugging
-     * context to test that further GL calls are not made by Skia GPU code.
-     */
-    void testAbandon();
-
-    /**
-     * Creates a new GL context of the same type and makes the returned context current
-     * (if not null).
-     */
-    virtual SkGLContext* createNew() const { return nullptr; }
-
-    class GLFenceSync;  // SkGpuFenceSync implementation that uses the OpenGL functionality.
-
-    /*
-     * returns the fencesync object owned by this SkGLContext
-     */
-    SkGpuFenceSync* fenceSync() { return fFenceSync.get(); }
-
-protected:
-    SkGLContext();
-
-    /*
-     * Methods that sublcasses must call from their constructors and destructors.
-     */
-    void init(const GrGLInterface*, SkGpuFenceSync* = NULL);
-    void teardown();
-
-    /*
-     * Operations that have a platform-dependent implementation.
-     */
-    virtual void onPlatformMakeCurrent() const = 0;
-    virtual void onPlatformSwapBuffers() const = 0;
-    virtual GrGLFuncPtr onPlatformGetProcAddress(const char*) const = 0;
-
-private:
-    enum { kMaxFrameLag = 3 };
-
-    SkAutoTDelete<SkGpuFenceSync> fFenceSync;
-    SkPlatformGpuFence            fFrameFences[kMaxFrameLag - 1];
-    int                           fCurrentFenceIdx;
-
-    /** Subclass provides the gl interface object if construction was
-     *  successful. */
-    SkAutoTUnref<const GrGLInterface> fGL;
-
-    friend class GLFenceSync;  // For onPlatformGetProcAddress.
-};
-
-/** Creates platform-dependent GL context object.  The shareContext parameter is in an optional
- * context with which to share display lists. This should be a pointer to an SkGLContext created
- * with SkCreatePlatformGLContext.  NULL indicates that no sharing is to take place. Returns a valid
- * gl context object or NULL if such can not be created.
- * Note: If Skia embedder needs a custom GL context that sets up the GL interface, this function
- * should be implemented by the embedder. Otherwise, the default implementation for the platform
- * should be compiled in the library.
- */
-SK_API SkGLContext* SkCreatePlatformGLContext(GrGLStandard forcedGpuAPI,
-                                              SkGLContext* shareContext = nullptr);
-
-/**
- * Helper macros for using the GL context through the GrGLInterface. Example:
- * SK_GL(glCtx, GenTextures(1, &texID));
- */
-#define SK_GL(ctx, X) (ctx).gl()->fFunctions.f ## X;    \
-                      SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
-#define SK_GL_RET(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X;    \
-                  SkASSERT(0 == (ctx).gl()->fFunctions.fGetError())
-#define SK_GL_NOERRCHECK(ctx, X) (ctx).gl()->fFunctions.f ## X
-#define SK_GL_RET_NOERRCHECK(ctx, RET, X) (RET) = (ctx).gl()->fFunctions.f ## X
-
-#endif