Access library dependencies through a single object.

Bug 18752589

Change-Id: I93155cead50b30faa876023f9ed00f60b7c9e34e
Reviewed-on: https://swiftshader-review.googlesource.com/2831
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Greg Hartman <ghartman@google.com>
Tested-by: Greg Hartman <ghartman@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>

src/OpenGL/libEGL/libEGL.hpp

diff --git a/src/OpenGL/libEGL/libEGL.hpp b/src/OpenGL/libEGL/libEGL.hpp
new file mode 100644
index 0000000..2fd614d
--- /dev/null
+++ b/src/OpenGL/libEGL/libEGL.hpp
@@ -0,0 +1,108 @@
+#ifndef libEGL_hpp
+#define libEGL_hpp
+
+#define EGLAPI
+#include <EGL/egl.h>
+#define EGL_EGLEXT_PROTOTYPES
+#include <EGL/eglext.h>
+
+#include "Common/SharedLibrary.hpp"
+
+class LibEGLexports
+{
+public:
+	LibEGLexports();
+
+	EGLint (EGLAPIENTRY *eglGetError)(void);
+	EGLDisplay (EGLAPIENTRY *eglGetDisplay)(EGLNativeDisplayType display_id);
+	EGLBoolean (EGLAPIENTRY *eglInitialize)(EGLDisplay dpy, EGLint *major, EGLint *minor);
+	EGLBoolean (EGLAPIENTRY *eglTerminate)(EGLDisplay dpy);
+	const char *(EGLAPIENTRY *eglQueryString)(EGLDisplay dpy, EGLint name);
+	EGLBoolean (EGLAPIENTRY *eglGetConfigs)(EGLDisplay dpy, EGLConfig *configs, EGLint config_size, EGLint *num_config);
+	EGLBoolean (EGLAPIENTRY *eglChooseConfig)(EGLDisplay dpy, const EGLint *attrib_list, EGLConfig *configs, EGLint config_size, EGLint *num_config);
+	EGLBoolean (EGLAPIENTRY *eglGetConfigAttrib)(EGLDisplay dpy, EGLConfig config, EGLint attribute, EGLint *value);
+	EGLSurface (EGLAPIENTRY *eglCreateWindowSurface)(EGLDisplay dpy, EGLConfig config, EGLNativeWindowType window, const EGLint *attrib_list);
+	EGLSurface (EGLAPIENTRY *eglCreatePbufferSurface)(EGLDisplay dpy, EGLConfig config, const EGLint *attrib_list);
+	EGLSurface (EGLAPIENTRY *eglCreatePixmapSurface)(EGLDisplay dpy, EGLConfig config, EGLNativePixmapType pixmap, const EGLint *attrib_list);
+	EGLBoolean (EGLAPIENTRY *eglDestroySurface)(EGLDisplay dpy, EGLSurface surface);
+	EGLBoolean (EGLAPIENTRY *eglQuerySurface)(EGLDisplay dpy, EGLSurface surface, EGLint attribute, EGLint *value);
+	EGLBoolean (EGLAPIENTRY *eglBindAPI)(EGLenum api);
+	EGLenum (EGLAPIENTRY *eglQueryAPI)(void);
+	EGLBoolean (EGLAPIENTRY *eglWaitClient)(void);
+	EGLBoolean (EGLAPIENTRY *eglReleaseThread)(void);
+	EGLSurface (EGLAPIENTRY *eglCreatePbufferFromClientBuffer)(EGLDisplay dpy, EGLenum buftype, EGLClientBuffer buffer, EGLConfig config, const EGLint *attrib_list);
+	EGLBoolean (EGLAPIENTRY *eglSurfaceAttrib)(EGLDisplay dpy, EGLSurface surface, EGLint attribute, EGLint value);
+	EGLBoolean (EGLAPIENTRY *eglBindTexImage)(EGLDisplay dpy, EGLSurface surface, EGLint buffer);
+	EGLBoolean (EGLAPIENTRY *eglReleaseTexImage)(EGLDisplay dpy, EGLSurface surface, EGLint buffer);
+	EGLBoolean (EGLAPIENTRY *eglSwapInterval)(EGLDisplay dpy, EGLint interval);
+	EGLContext (EGLAPIENTRY *eglCreateContext)(EGLDisplay dpy, EGLConfig config, EGLContext share_context, const EGLint *attrib_list);
+	EGLBoolean (EGLAPIENTRY *eglDestroyContext)(EGLDisplay dpy, EGLContext ctx);
+	EGLBoolean (EGLAPIENTRY *eglMakeCurrent)(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx);
+	EGLContext (EGLAPIENTRY *eglGetCurrentContext)(void);
+	EGLSurface (EGLAPIENTRY *eglGetCurrentSurface)(EGLint readdraw);
+	EGLDisplay (EGLAPIENTRY *eglGetCurrentDisplay)(void);
+	EGLBoolean (EGLAPIENTRY *eglQueryContext)(EGLDisplay dpy, EGLContext ctx, EGLint attribute, EGLint *value);
+	EGLBoolean (EGLAPIENTRY *eglWaitGL)(void);
+	EGLBoolean (EGLAPIENTRY *eglWaitNative)(EGLint engine);
+	EGLBoolean (EGLAPIENTRY *eglSwapBuffers)(EGLDisplay dpy, EGLSurface surface);
+	EGLBoolean (EGLAPIENTRY *eglCopyBuffers)(EGLDisplay dpy, EGLSurface surface, EGLNativePixmapType target);
+	EGLImageKHR (EGLAPIENTRY *eglCreateImageKHR)(EGLDisplay dpy, EGLContext ctx, EGLenum target, EGLClientBuffer buffer, const EGLint *attrib_list);
+	EGLBoolean (EGLAPIENTRY *eglDestroyImageKHR)(EGLDisplay dpy, EGLImageKHR image);
+	__eglMustCastToProperFunctionPointerType (EGLAPIENTRY *eglGetProcAddress)(const char*);
+
+	// Functions that don't change the error code, for use by client APIs
+	egl::Context *(*clientGetCurrentContext)();
+	egl::Display *(*clientGetCurrentDisplay)();
+};
+
+class LibEGL
+{
+public:
+	LibEGL()
+	{
+		libEGL = nullptr;
+		libEGLexports = nullptr;
+	}
+
+	~LibEGL()
+	{
+		freeLibrary(libEGL);
+	}
+
+	LibEGLexports *operator->()
+	{
+		return loadExports();
+	}
+
+private:
+	LibEGLexports *loadExports()
+	{
+		if(!libEGL)
+		{
+			#if defined(_WIN32)
+			const char *libEGL_lib[] = {"libEGL.dll", "libEGL_translator.dll"};
+			#elif defined(__ANDROID__)
+			const char *libEGL_lib[] = {"/vendor/lib/egl/libEGL_swiftshader.so"};
+			#elif defined(__LP64__)
+			const char *libEGL_lib[] = {"lib64EGL_translator.so", "libEGL.so.1", "libEGL.so"};
+			#else
+			const char *libEGL_lib[] = {"libEGL_translator.so", "libEGL.so.1", "libEGL.so"};
+			#endif
+
+			libEGL = loadLibrary(libEGL_lib);
+
+			if(libEGL)
+			{
+				auto libEGLexportsProc = (LibEGLexports *(*)())getProcAddress(libEGL, "libEGLexports");
+				libEGLexports = libEGLexportsProc();
+			}
+		}
+
+		return libEGLexports;
+	}
+
+	void *libEGL;
+	LibEGLexports *libEGLexports;
+};
+
+#endif   // libEGL_hpp