Core
SDL core operations
Operations
- ClearError
- GLExtensionSupported
- GLGetAttribute
- GLGetCurrentWindow
- GLGetSwapInterval
- GLLoadLibrary
- GLResetAttributes
- GLSetAttribute
- GLSetSwapInterval
- GLUnloadLibrary
- GetError
- Init
- InitSubSystem
- Quit
- QuitSubSystem
- WasInit
GLExtensionSupported # function
Check if an OpenGL extension is supported for the current context
function : GLExtensionSupported(extension:String) ~ BoolParameters
| Name | Type | Description |
|---|---|---|
| extension | String | the name of the extension to check |
Return
| Type | Description |
|---|---|
| Bool | true if the extension is supported, false otherwise |
GLGetAttribute # function
Get the actual value for an attribute from the current context
function : GLGetAttribute(attr:GLattr, value:IntRef) ~ IntParameters
| Name | Type | Description |
|---|---|---|
| attr | GLattr | the SDL_GLattr structure to query |
| value | IntRef | pointer filled in with the current value of attr |
Return
| Type | Description |
|---|---|
| Int | 0 on success or a negative error code on failure |
GLGetCurrentWindow # function
Get the currently active OpenGL window
function : GLGetCurrentWindow() ~ WindowReturn
| Type | Description |
|---|---|
| Window | active window |
GLGetSwapInterval # function
Get the swap interval for the current OpenGL context
function : GLGetSwapInterval() ~ IntReturn
| Type | Description |
|---|---|
| Int | 0 if there is no vertical retrace synchronization, 1 if the buffer swap is synchronized with the vertical retrace, and -1 if late swaps happen immediately instead of waiting for the next retrace; |
GLLoadLibrary # function
dynamically load an OpenGL library
function : GLLoadLibrary(path:String) ~ IntParameters
| Name | Type | Description |
|---|---|---|
| path | String | the platform dependent OpenGL library name, or Nil to open the default OpenGL library |
GLResetAttributes # function
Reset all previously set OpenGL context attributes to their default values
function : GLResetAttributes() ~ NilGLSetAttribute # function
Set an OpenGL window attribute before window creation
function : GLSetAttribute(attr:GLattr, value:Int) ~ IntParameters
| Name | Type | Description |
|---|---|---|
| attr | GLattr | the OpenGL attribute to set; see Remarks for details |
| value | Int | the desired value for the attribute |
Return
| Type | Description |
|---|---|
| Int | 0 on success or a negative error code on failure |
GLSetSwapInterval # function
Set the swap interval for the current OpenGL context
function : GLSetSwapInterval(interval:Int) ~ IntParameters
| Name | Type | Description |
|---|---|---|
| interval | Int | 0 for immediate updates, 1 for updates synchronized with the vertical retrace, -1 for adaptive vsync |
Return
| Type | Description |
|---|---|
| Int | 0 on success or -1 if setting the swap interval is not supported |
GLUnloadLibrary # function
Unload the OpenGL library previously loaded
function : GLUnloadLibrary() ~ NilGetError # function
Retrieve a message about the last error that occurred
function : GetError() ~ StringReturn
| Type | Description |
|---|---|
| String | message with information about the specific error that occurred |
Init # function
Initialize the SDL library. This must be called before using most other SDL functions.
function : Init(flags:Int) ~ IntParameters
| Name | Type | Description |
|---|---|---|
| flags | Int | subsystem initialization flags |
InitSubSystem # function
Initialize specific SDL subsystems
function : InitSubSystem(flags:Int) ~ IntParameters
| Name | Type | Description |
|---|---|---|
| flags | Int | subsystem initialization flags |
Quit # function
Clean up all initialized subsystems. You should call it upon all exit conditions.
function : Quit() ~ Nil