| // |
| // 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 |