| Flutter Impeller |

Public Types | Public Member Functions | Public Attributes | List of all members
impeller::GLProc< T > Struct Template Reference

`#include <proc_table_gles.h>`

## Public Types
using | GLFunctionType = T

## Public Member Functions
template<class... Args>
auto | operator() (Args &&... args) const
| Call the GL function with the appropriate parameters. Lookup the documentation for the GL function being called to understand the arguments and return types. The arguments types must match and will be type checked. More...
constexpr bool | IsAvailable () const
void | Reset ()

## Public Attributes
const char * | name = nullptr
GLFunctionType * | function = nullptr
PFNGLGETERRORPROC | error_fn = nullptr

## Detailed Description

### template<class T>
struct impeller::GLProc< T >

Definition at line 49 of file proc_table_gles.h.

## Member Typedef Documentation

## ◆ GLFunctionType

template<class T >

using impeller::GLProc< T >::GLFunctionType = T

Definition at line 50 of file proc_table_gles.h.

## Member Function Documentation

## ◆ IsAvailable()

template<class T >

constexpr bool impeller::GLProc< T >::IsAvailable | ( |  | ) | const
| inline constexpr

Definition at line 88 of file proc_table_gles.h.

88 { return function != nullptr; }

Referenced by impeller::GLProc< T >::operator()().

## ◆ operator()()

template<class T >
template<class... Args>

auto impeller::GLProc< T >::operator() | ( | Args &&... | args | ) | const
| inline

Call the GL function with the appropriate parameters. Lookup the documentation for the GL function being called to understand the arguments and return types. The arguments types must match and will be type checked.

Definition at line 76 of file proc_table_gles.h.

76 {
77 #if defined(IMPELLER_DEBUG) && !defined(NDEBUG)
78 AutoErrorCheck error(error_fn, name);
79 // We check for the existence of extensions, and reset the function pointer
80 // but it's still called unconditionally below, and will segfault. This
81 // validation log will at least give us a hint as to what's going on.
82 FML_CHECK(IsAvailable()) << "GL function " << name << " is not available. "
83 << "This is likely due to a missing extension.";
84 #endif // defined(IMPELLER_DEBUG) && !defined(NDEBUG)
85 return function(std::forward<Args>(args)...);
86 }

References impeller::GLProc< T >::error_fn, impeller::GLProc< T >::IsAvailable(), and impeller::GLProc< T >::name.

## ◆ Reset()

template<class T >

void impeller::GLProc< T >::Reset | ( |  | ) |
| inline

Definition at line 90 of file proc_table_gles.h.

90 {
91 function = nullptr;
92 error_fn = nullptr;
93 }

References impeller::GLProc< T >::error_fn.

## Member Data Documentation

## ◆ error_fn

template<class T >

PFNGLGETERRORPROC impeller::GLProc< T >::error_fn = nullptr

An optional error function. If present, all calls will be followed by an error check.

Definition at line 67 of file proc_table_gles.h.

Referenced by impeller::GLProc< T >::operator()(), and impeller::GLProc< T >::Reset().

## ◆ function

template<class T >

GLFunctionType* impeller::GLProc< T >::function = nullptr

The pointer to the GL function.

Definition at line 61 of file proc_table_gles.h.

## ◆ name

template<class T >

const char* impeller::GLProc< T >::name = nullptr

The name of the GL function.

Definition at line 56 of file proc_table_gles.h.

Referenced by impeller::GLProc< T >::operator()().

The documentation for this struct was generated from the following file:

- impeller/renderer/backend/gles/proc_table_gles.h

impeller::GLProc::IsAvailable
constexpr bool IsAvailable() const
Definition: proc_table_gles.h:88
impeller::GLProc::error_fn
PFNGLGETERRORPROC error_fn
Definition: proc_table_gles.h:67
impeller::GLProc::name
const char * name
Definition: proc_table_gles.h:56