//
// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Platform.h: The public interface ANGLE exposes to the API layer, for
// doing platform-specific tasks like gathering data, or for tracing.
#ifndef ANGLE_PLATFORM_H
#define ANGLE_PLATFORM_H
#include <stdint.h>
#include <array>
#define EGL_PLATFORM_ANGLE_PLATFORM_METHODS_ANGLEX 0x3482
#if defined(_WIN32)
# if !defined(LIBANGLE_IMPLEMENTATION)
# define ANGLE_PLATFORM_EXPORT __declspec(dllimport)
# else
# define ANGLE_PLATFORM_EXPORT __declspec(dllexport)
# endif
#elif defined(__GNUC__) || defined(__clang__)
# define ANGLE_PLATFORM_EXPORT __attribute__((visibility ("default")))
#endif
#if !defined(ANGLE_PLATFORM_EXPORT)
# define ANGLE_PLATFORM_EXPORT
#endif
#if defined(_WIN32)
# define ANGLE_APIENTRY __stdcall
#else
# define ANGLE_APIENTRY
#endif
namespace angle
{
struct WorkaroundsD3D;
struct FeaturesVk;
using TraceEventHandle = uint64_t;
using EGLDisplayType = void *;
struct PlatformMethods;
// Use a C-like API to not trigger undefined calling behaviour.
// Avoid using decltype here to work around sanitizer limitations.
// TODO(jmadill): Use decltype here if/when UBSAN is fixed.
// System --------------------------------------------------------------
// Wall clock time in seconds since the epoch.
// TODO(jmadill): investigate using an ANGLE internal time library
using CurrentTimeFunc = double (*)(PlatformMethods *platform);
inline double DefaultCurrentTime(PlatformMethods *platform)
{
return 0.0;
}
// Monotonically increasing time in seconds from an arbitrary fixed point in the past.
// This function is expected to return at least millisecond-precision values. For this reason,
// it is recommended that the fixed point be no further in the past than the epoch.
using MonotonicallyIncreasingTimeFunc = double (*)(PlatformMethods *platform);
inline double DefaultMonotonicallyIncreasingTime(PlatformMethods *platform)
{
return 0.0;
}
// Logging ------------------------------------------------------------
// Log an error message within the platform implementation.
using LogErrorFunc = void (*)(PlatformMethods *platform, const char *errorMessage);
inline void DefaultLogError(PlatformMethods *platform, const char *errorMessage)
{
}
// Log a warning message within the platform implementation.
using LogWarningFunc = void (*)(PlatformMethods *platform, const char *warningMessage);
inline void DefaultLogWarning(PlatformMethods *platform, const char *warningMessage)
{
}
// Log an info message within the platform implementation.
using LogInfoFunc = void (*)(PlatformMethods *platform, const char *infoMessage);
inline void DefaultLogInfo(PlatformMethods *platform, const char *infoMessage)
{
}
// Tracing --------
// Get a pointer to the enabled state of the given trace category. The
// embedder can dynamically change the enabled state as trace event
// recording is started and stopped by the application. Only long-lived
// literal strings should be given as the category name. The implementation
// expects the returned pointer to be held permanently in a local static. If
// the unsigned char is non-zero, tracing is enabled. If tracing is enabled,
// addTraceEvent is expected to be called by the trace event macros.
using GetTraceCategoryEnabledFlagFunc = const unsigned char *(*)(PlatformMethods *platform,
const char *categoryName);
inline const unsigned char *DefaultGetTraceCategoryEnabledFlag(PlatformMethods *platform,
const char *categoryName)
{
return nullptr;
}
//
// Add a trace event to the platform tracing system. Depending on the actual
// enabled state, this event may be recorded or dropped.
// - phase specifies the type of event:
// - BEGIN ('B'): Marks the beginning of a scoped event.
// - END ('E'): Marks the end of a scoped event.
// - COMPLETE ('X'): Marks the beginning of a scoped event, but doesn't
// need a matching END event. Instead, at the end of the scope,
// updateTraceEventDuration() must be called with the TraceEventHandle
// returned from addTraceEvent().
// - INSTANT ('I'): Standalone, instantaneous event.
// - START ('S'): Marks the beginning of an asynchronous event (the end
// event can occur in a different scope or thread). The id parameter is
// used to match START/FINISH pairs.
// - FINISH ('F'): Marks the end of an asynchronous event.
// - COUNTER ('C'): Used to trace integer quantities that change over
// time. The argument values are expected to be of type int.
// - METADATA ('M'): Reserved for internal use.
// - categoryEnabled is the pointer returned by getTraceCategoryEnabledFlag.
// - name is the name of the event. Also used to match BEGIN/END and
// START/FINISH pairs.
// - id optionally allows events of the same name to be distinguished from
// each other. For example, to trace the construction and destruction of
// objects, specify the pointer as the id parameter.
// - timestamp should be a time value returned from monotonicallyIncreasingTime.
// - numArgs specifies the number of elements in argNames, argTypes, and
// argValues.
// - argNames is the array of argument names. Use long-lived literal strings
// or specify the COPY flag.
// - argTypes is the array of argument types:
// - BOOL (1): bool
// - UINT (2): unsigned long long
// - INT (3): long long
// - DOUBLE (4): double
// - POINTER (5): void*
// - STRING (6): char* (long-lived null-terminated char* string)
// - COPY_STRING (7): char* (temporary null-terminated char* string)
// - CONVERTABLE (8): WebConvertableToTraceFormat
// - argValues is the array of argument values. Each value is the unsigned
// long long member of a union of all supported types.
// - flags can be 0 or one or more of the following, ORed together:
// - COPY (0x1): treat all strings (name, argNames and argValues of type
// string) as temporary so that they will be copied by addTraceEvent.
// - HAS_ID (0x2): use the id argument to uniquely identify the event for
// matching with other events of the same name.
// - MANGLE_ID (0x4): specify this flag if the id parameter is the value
// of a pointer.
using AddTraceEventFunc = angle::TraceEventHandle (*)(PlatformMethods *platform,
char phase,
const unsigned char *categoryEnabledFlag,
const char *name,
unsigned long long id,
double timestamp,
int numArgs,
const char **argNames,
const unsigned char *argTypes,
const unsigned long long *argValues,
unsigned char flags);
inline angle::TraceEventHandle DefaultAddTraceEvent(PlatformMethods *platform,
char phase,
const unsigned char *categoryEnabledFlag,
const char *name,
unsigned long long id,
double timestamp,
int numArgs,
const char **argNames,
const unsigned char *argTypes,
const unsigned long long *argValues,
unsigned char flags)
{
return 0;
}
// Set the duration field of a COMPLETE trace event.
using UpdateTraceEventDurationFunc = void (*)(PlatformMethods *platform,
const unsigned char *categoryEnabledFlag,
const char *name,
angle::TraceEventHandle eventHandle);
inline void DefaultUpdateTraceEventDuration(PlatformMethods *platform,
const unsigned char *categoryEnabledFlag,
const char *name,
angle::TraceEventHandle eventHandle)
{
}
// Callbacks for reporting histogram data.
// CustomCounts histogram has exponential bucket sizes, so that min=1, max=1000000, bucketCount=50
// would do.
using HistogramCustomCountsFunc = void (*)(PlatformMethods *platform,
const char *name,
int sample,
int min,
int max,
int bucketCount);
inline void DefaultHistogramCustomCounts(PlatformMethods *platform,
const char *name,
int sample,
int min,
int max,
int bucketCount)
{
}
// Enumeration histogram buckets are linear, boundaryValue should be larger than any possible sample
// value.
using HistogramEnumerationFunc = void (*)(PlatformMethods *platform,
const char *name,
int sample,
int boundaryValue);
inline void DefaultHistogramEnumeration(PlatformMethods *platform,
const char *name,
int sample,
int boundaryValue)
{
}
// Unlike enumeration histograms, sparse histograms only allocate memory for non-empty buckets.
using HistogramSparseFunc = void (*)(PlatformMethods *platform, const char *name, int sample);
inline void DefaultHistogramSparse(PlatformMethods *platform, const char *name, int sample)
{
}
// Boolean histograms track two-state variables.
using HistogramBooleanFunc = void (*)(PlatformMethods *platform, const char *name, bool sample);
inline void DefaultHistogramBoolean(PlatformMethods *platform, const char *name, bool sample)
{
}
// Allows us to programatically override ANGLE's default workarounds for testing purposes.
using OverrideWorkaroundsD3DFunc = void (*)(PlatformMethods *platform,
angle::WorkaroundsD3D *workaroundsD3D);
inline void DefaultOverrideWorkaroundsD3D(PlatformMethods *platform,
angle::WorkaroundsD3D *workaroundsD3D)
{
}
using OverrideFeaturesVkFunc = void (*)(PlatformMethods *platform,
angle::FeaturesVk *workaroundsVulkan);
inline void DefaultOverrideFeaturesVk(PlatformMethods *platform,
angle::FeaturesVk *workaroundsVulkan)
{
}
// Callback on a successful program link with the program binary. Can be used to store
// shaders to disk. Keys are a 160-bit SHA-1 hash.
using ProgramKeyType = std::array<uint8_t, 20>;
using CacheProgramFunc = void (*)(PlatformMethods *platform,
const ProgramKeyType &key,
size_t programSize,
const uint8_t *programBytes);
inline void DefaultCacheProgram(PlatformMethods *platform,
const ProgramKeyType &key,
size_t programSize,
const uint8_t *programBytes)
{
}
// Platform methods are enumerated here once.
#define ANGLE_PLATFORM_OP(OP) \
OP(currentTime, CurrentTime) \
OP(monotonicallyIncreasingTime, MonotonicallyIncreasingTime) \
OP(logError, LogError) \
OP(logWarning, LogWarning) \
OP(logInfo, LogInfo) \
OP(getTraceCategoryEnabledFlag, GetTraceCategoryEnabledFlag) \
OP(addTraceEvent, AddTraceEvent) \
OP(updateTraceEventDuration, UpdateTraceEventDuration) \
OP(histogramCustomCounts, HistogramCustomCounts) \
OP(histogramEnumeration, HistogramEnumeration) \
OP(histogramSparse, HistogramSparse) \
OP(histogramBoolean, HistogramBoolean) \
OP(overrideWorkaroundsD3D, OverrideWorkaroundsD3D) \
OP(overrideFeaturesVk, OverrideFeaturesVk) \
OP(cacheProgram, CacheProgram)
#define ANGLE_PLATFORM_METHOD_DEF(Name, CapsName) CapsName##Func Name = Default##CapsName;
struct ANGLE_PLATFORM_EXPORT PlatformMethods
{
PlatformMethods() {}
// User data pointer for any implementation specific members. Put it at the start of the
// platform structure so it doesn't become overwritten if one version of the platform
// adds or removes new members.
void *context = 0;
ANGLE_PLATFORM_OP(ANGLE_PLATFORM_METHOD_DEF);
};
#undef ANGLE_PLATFORM_METHOD_DEF
// Subtract one to account for the context pointer.
constexpr unsigned int g_NumPlatformMethods = (sizeof(PlatformMethods) / sizeof(uintptr_t)) - 1;
#define ANGLE_PLATFORM_METHOD_STRING(Name) #Name
#define ANGLE_PLATFORM_METHOD_STRING2(Name, CapsName) ANGLE_PLATFORM_METHOD_STRING(Name),
constexpr const char *const g_PlatformMethodNames[g_NumPlatformMethods] = {
ANGLE_PLATFORM_OP(ANGLE_PLATFORM_METHOD_STRING2)};
#undef ANGLE_PLATFORM_METHOD_STRING2
#undef ANGLE_PLATFORM_METHOD_STRING
} // namespace angle
extern "C" {
// Gets the platform methods on the passed-in EGL display. If the method name signature does not
// match the compiled signature for this ANGLE, false is returned. On success true is returned.
// The application should set any platform methods it cares about on the returned pointer.
// If display is not valid, behaviour is undefined.
ANGLE_PLATFORM_EXPORT bool ANGLE_APIENTRY ANGLEGetDisplayPlatform(angle::EGLDisplayType display,
const char *const methodNames[],
unsigned int methodNameCount,
void *context,
void *platformMethodsOut);
// Sets the platform methods back to their defaults.
// If display is not valid, behaviour is undefined.
ANGLE_PLATFORM_EXPORT void ANGLE_APIENTRY ANGLEResetDisplayPlatform(angle::EGLDisplayType display);
} // extern "C"
namespace angle
{
typedef bool(ANGLE_APIENTRY *GetDisplayPlatformFunc)(angle::EGLDisplayType,
const char *const *,
unsigned int,
void *,
void *);
typedef void(ANGLE_APIENTRY *ResetDisplayPlatformFunc)(angle::EGLDisplayType);
} // namespace angle
// This function is not exported
angle::PlatformMethods *ANGLEPlatformCurrent();
#endif // ANGLE_PLATFORM_H