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Index

GetOpenGLStateTrackerApi() glACreateContext() glADestroyContext() glAGetConfig()
glAGetCurrentContext() glAGetProcAddress() glAMakeCurrent() glASetRast()
glASwapBuffers()      

GetOpenGLStateTrackerApi()

Synopsis

APTR GetOpenGLStateTrackerApi(
 )

Function

This is a PRIVATE function used by egl.library to receive pointer to
api structure of OpenGL. Do not use this function in your application.

glACreateContext()

Synopsis

GLAContext glACreateContext(
 struct TagItem *tagList)

Function

Crates a GL rendering context that can be later used in subsequent
calls.

Inputs

tagList - a pointer to tags to be used during creation.

Tags

GLA_Left   - specifies the left rendering offset on the rastport.
             Typically equals to window->BorderLeft.

GLA_Top    - specifies the top rendering offset on the rastport.
             Typically equals to window->BorderTop.

GLA_Right  - specifies the right rendering offset on the rastport.
             Typically equals to window->BorderRight.

GLA_Bottom - specifies the bottom rendering offset on the rastport.
             Typically equals to window->BorderBottom.

GLA_Width  - specifies the width of the rendering area.
             GLA_Width + GLA_Left + GLA_Right should equal the width of
             the rastport. The GLA_Width is interchangable at cration
             time with GLA_Right. Later durring window resizing, width
             is calculated from scalled left, righ and window width.

GLA_Height - specifies the height of the rendering area.
             GLA_Height + GLA_Top + GLA_Bottom should equal the height
             of the rastport. The GLA_Height is interchangable at
             cration time with GLA_Bottom. Later durring window resizing
             , height is calculated from scalled top, bottom and window
             height.

GLA_Screen - pointer to Screen onto which scene is to be rendered. When
             selecting RastPort has lower priority than GLA_Window.

GLA_Window - pointer to Window onto which scene is to be rendered. Must
             be provided.

GLA_RastPort - ignored. Use GLA_Window.

GLA_DoubleBuf - ignored. All rendering is always double buffered.

GLA_RGBMode - ignored. All rendering is done in RGB. Indexed modes are
              not supported.

GLA_AlphaFlag - ignored. All rendering is done with alpha channel.

GLA_NoDepth - disables the depth/Z buffer. Depth buffer is enabled by
              default and is 16 or 24 bit based on rendering
              capabilities.

GLA_NoStencil - disables the stencil buffer. Stencil buffer is enabled
                by default.

GLA_NoAccum - disables the accumulation buffer. Accumulation buffer is
              enabled by default.

Result

A valid GL context or NULL of creation was not succesfull.

glADestroyContext()

Synopsis

void glADestroyContext(
 GLAContext ctx)

Function

Destroys the GL rendering context and frees all resoureces.

Inputs

ctx - pointer to GL rendering context. A NULL pointer will be
        ignored.

Result

The GL context is destroyed. Do no use it anymore.

glAGetConfig()

Synopsis

void glAGetConfig(
 GLAContext ctx,
 GLenum pname,
 GLint * params)

Function

Gets value of selected parameter

Inputs

pname - enum value of parameter

params - pointer to integer where the value is to be put

Result

None

glAGetCurrentContext()

Synopsis

GLAContext glAGetCurrentContext(
 )

Function

Returns the currently selected GL rendering context.

Result

The GL rendering context which is currently active.

glAGetProcAddress()

Synopsis

GLAProc glAGetProcAddress(
 const GLubyte * procname)

Result

Pointer to procname function or NULL if function is not supported

glAMakeCurrent()

Synopsis

void glAMakeCurrent(
 GLAContext ctx)

Function

Make the selected GL rendering context active.

Inputs

ctx - GL rendering context to be made active for all following GL
        calls.

glASetRast()

Synopsis

void glASetRast(
 GLAContext ctx,
 struct TagItem * tagList)

Function

Sets a new rendering target for an existing context

Inputs

ctx -
tagList - a pointer to tags to be used during creation.

Tags

GLA_Window - pointer to Window onto which scene is to be rendered. Must
             be provided.

Result

None

glASwapBuffers()

Synopsis

void glASwapBuffers(
 GLAContext ctx)

Function

Swaps the back with front buffers. MUST BE used to display the effect
of rendering onto the target RastPort, since GLA always work in
double buffer mode.

Inputs

ctx - GL rendering context on which swap is to be performed.

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