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/*
* 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 GLTestContext_DEFINED
#define GLTestContext_DEFINED
#include "gl/GrGLInterface.h"
#include "../private/SkGpuFenceSync.h"
namespace sk_gpu_test {
/**
* Create an offscreen Oppengl context. Provides a GrGLInterface struct of function pointers for
* the context. This class is intended for Skia's internal testing needs and not for general use.
*/
class GLTestContext : public SkNoncopyable {
public:
virtual ~GLTestContext();
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 GLTestContext *createNew() const { return nullptr; }
class GLFenceSync; // SkGpuFenceSync implementation that uses the OpenGL functionality.
/*
* returns the fencesync object owned by this GLTestContext
*/
SkGpuFenceSync *fenceSync() { return fFenceSync.get(); }
protected:
GLTestContext();
/*
* 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 GLTestContext created
* with SkCreatePlatformGLTestContext. 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.
*/
GLTestContext* CreatePlatformGLTestContext(GrGLStandard forcedGpuAPI, GLTestContext *shareContext = nullptr);
} // namespace sk_gpu_test
#endif
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