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//
// Copyright 2018 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.
//
// entry_point_utils:
// These helpers are used in GL/GLES entry point routines.
#ifndef LIBANGLE_ENTRY_POINT_UTILS_H_
#define LIBANGLE_ENTRY_POINT_UTILS_H_
#include "angle_gl.h"
#include "common/Optional.h"
#include "common/PackedEnums.h"
#include "common/angleutils.h"
#include "common/mathutil.h"
#include "libANGLE/entry_points_enum_autogen.h"
namespace gl
{
// A template struct for determining the default value to return for each entry point.
template <EntryPoint EP, typename ReturnType>
struct DefaultReturnValue;
// Default return values for each basic return type.
template <EntryPoint EP>
struct DefaultReturnValue<EP, GLint>
{
static constexpr GLint kValue = -1;
};
// This doubles as the GLenum return value.
template <EntryPoint EP>
struct DefaultReturnValue<EP, GLuint>
{
static constexpr GLuint kValue = 0;
};
template <EntryPoint EP>
struct DefaultReturnValue<EP, GLboolean>
{
static constexpr GLboolean kValue = GL_FALSE;
};
// Catch-all rules for pointer types.
template <EntryPoint EP, typename PointerType>
struct DefaultReturnValue<EP, const PointerType *>
{
static constexpr const PointerType *kValue = nullptr;
};
template <EntryPoint EP, typename PointerType>
struct DefaultReturnValue<EP, PointerType *>
{
static constexpr PointerType *kValue = nullptr;
};
// Overloaded to return invalid index
template <>
struct DefaultReturnValue<EntryPoint::GetUniformBlockIndex, GLuint>
{
static constexpr GLuint kValue = GL_INVALID_INDEX;
};
// Specialized enum error value.
template <>
struct DefaultReturnValue<EntryPoint::ClientWaitSync, GLenum>
{
static constexpr GLenum kValue = GL_WAIT_FAILED;
};
// glTestFenceNV should still return TRUE for an invalid fence.
template <>
struct DefaultReturnValue<EntryPoint::TestFenceNV, GLboolean>
{
static constexpr GLboolean kValue = GL_TRUE;
};
template <EntryPoint EP, typename ReturnType>
constexpr ANGLE_INLINE ReturnType GetDefaultReturnValue()
{
return DefaultReturnValue<EP, ReturnType>::kValue;
}
#if ANGLE_CAPTURE_ENABLED
# define ANGLE_CAPTURE(Func, ...) \
CaptureCallToFrameCapture("gl" ANGLE_STRINGIFY(Func), Capture##Func, Validate##Func, \
__VA_ARGS__)
#else
# define ANGLE_CAPTURE(...)
#endif // ANGLE_CAPTURE_ENABLED
} // namespace gl
#endif // LIBANGLE_ENTRY_POINT_UTILS_H_
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