gdk_gl_* functions
Quite straightforward wrapper around few necessary GLX calls and
should be easy to understand if you already know GLX.
gdk_gl_pixmap_* functions
Latest addition, not very well tested yet, enables rendering
to off-screen pixmaps. See examples/glpixmap.c.
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NAME
gdk_gl_query - query for OpenGL capability
C SPECIFICATION
gint gdk_gl_query( void )
DESCRIPTION
gdk_gl_query returns TRUE if OpenGL is supported.
SEE ALSO
glXQueryExtension
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NAME
gdk_gl_choose_visual - return visual that matches given attributes
C SPECIFICATION
GdkVisual *gdk_gl_choose_visual( int *attrList )
PARAMETERS
attrList
Specifies a list of Boolean attributes and enum/integer
attribute/value pairs. The last attribute must be NULL
DESCRIPTION
gtk_gl_choose_visual returns pointer to a GdkVisual matching
given attributes. If no match is found NULL is returned.
For explanation of attributes see glXChooseVisual man page.
Note that GLX_ prefix of attributes is changed to GDK_GL_ .
SEE ALSO
glXChooseVisual
gdk_gl_context_share_new
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NAME
gdk_gl_get_config - return information about visuals
C SPECIFICATION
gint gdk_gl_get_config( GdkVisual *visual, int attrib )
PARAMETERS
visual
Specifies visual to be queried.
attrib
Specifies visual attribute to be returned
DESCRIPTION
gdk_gl_get_config return value of attrib of windows or
gl pixmap created with respect to visual. gdk_gl_get_config
returns -1 if it fails. For explanation of attributes see
glXGetConfig man page. Note that GLX_ prefix is changed to
GDK_GL_.
SEE ALSO
glXGetConfig
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NAME
gdk_gl_context_new - create new OpenGL rendering context
C SPECIFICATION
GdkGLContext *gdk_gl_context_new( GdkVisual *visual )
PARAMETERS
visual
Specifies the visual that defines the frame buffer
resources available. It is a pointer to GdkVisual.
DESCRIPTION
This is backwards compatability/convinence
function equal to gdk_gl_context_share_new(visual, NULL, FALSE).
SEE ALSO
glXCreateContext
gdk_gl_choosevisual
gdk_gl_context_share_new
---------------------------------------------------------------
NAME
gdk_gl_context_share_new - create new rendering context
C SPECIFICATION
GdkGLContext *gdk_gl_context_share_new( GdkVisual *visual,
GdkGLContext *sharelist,
gint direct )
PARAMETERS
visual
Pointer to GdkVisual that defines the frame buffer resources
available to the rendering context.
shareList
Context with which to share display lists and textures.
NULL indicates no sharing.
direct
TRUE if direct connection to graphics system.
FALSE if connection through X server.
DESCRIPTION
gdk_gl_context_share_new creates new rendering context
with reference count of 1 and returns pointer to it.
If context creation fails NULL is returned.
SEE ALSO
glXCreateContext
gdk_gl_context_new
gdk_gl_choose_visual
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NAME
gdk_gl_context_ref - increase reference count
C SPECIFICATION
GdkGLContext *gdk_gl_context_ref( GdkGLContext *context )
PARAMETERS
context
Pointer to a GdkGLContext.
DESCRIPTION
Increases reference count of context by one, returns context.
SEE ALSO
gdk_gl_context_new
gdk_gl_context_share_new
gdk_gl_context_unref
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NAME
gdk_gl_context_unref - decrease reference count
C SPECIFICATION
void gdk_gl_context_unref( GdkGLContext *context )
PARAMETERS
context Pointer to a GdlGLContext.
DESCRIPTION
gdk_gl_context_unref decreases reference count by 1 and
deletes context if it count drops to 0.
SEE ALSO
glXDestroyContext
gdk_gl_context_new
gdk_gl_context_share_new
gdk_gl_context_ref
---------------------------------------------------------------
NAME
gdk_gl_make_current - attach context to drawable
C SPECIFICATION
gint gdk_gl_make_current( GdkDrawable *drawable,
GdkGLContext *context )
DESCRIPTION
gdk_gl_make_current makes context current OpenGL rendering
context, and it attaches context to gdk drawable. Drawable
must have underlying X window and be created with the same
visual as context. gdk_gl_make_current returns TRUE if
successful.
SEE ALSO
glXMakeCurrent
gdk_gl_pixmap_make_current
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NAME
gdk_gl_swap_buffers - exchange front and back buffers
C SPECIFICATION
void gdk_gl_swap_buffers( GdkDrawable *drawable )
DESCRIPTION
Promotes back buffer of drawable to front.
SEE ALSO
glXSwapBuffers
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NAME
gdk_gl_wait_gdk - complete gdk execution
C SRECIFICATION
void gdk_gl_wait_gdk( void )
DESCRIPTION
Gdk rendering calls made prior to gtk_gl_wait_gdk are
guarateed to be executed before OpenGL calls made
after gdk_gl_wait_gdk.
SEE ALSO
glXWaitX
gdk_gl_wait_gl
---------------------------------------------------------------
NAME
gdk_gl_wait_gl - complete OpenGL execution
C SRECIFICATION
void gdk_gl_wait_gl( void )
DESCRIPTION
OpenGL rendering calls made prior to gtk_gl_wait_gdk are
are guarateed to be executed before OpenGL calls made
after gdk_gl_wait_gdk.
SEE ALSO
glXWaitGL
gdk_gl_wait_gdk
---------------------------------------------------------------
NAME
gdk_gl_pixmap_new - create an off screen rendering area
C SPECIFICATION
GdkGLPixmap *gdk_gl_pixmap_new( GdkVisual *visual,
GdkPixmap *pixmap )
DESCRIPTION
gdk_gl_pixmap_new returns pointer to new GdkGLPixmap with
reference count of 1. pixmap will become front left buffer
of GdkGLPixmap.
SEE ALSO
glXCreateGLXPixmap
gdk_gl_pixmap_ref
gdk_gl_pixmap_unref
---------------------------------------------------------------
NAME
gdk_gl_pixmap_ref - increase glpixmap reference count
C SPECIFICATION
GdkGLPixmap *gdk_gl_pixmap_ref( GdkGLPixmap *glpixmap )
PARAMETERS
glpixmap
a pointer to GdkGLPixmap
DESCRIPTION
SEE ALSO
gdk_gl_pixmap_new
gdk_gl_pixmap_unref
---------------------------------------------------------------
NAME
gdk_gl_pixmap_unref - decrease glpixmap reference count
C SPECIFICATION
void gdk_gl_pixmap_unref( GdkGLPixmap *glpixmap )
PARAMETERS
glpixmap
a pointer to GdkGLPixmap
DESCRIPTION
gdk_gl_pixmap_unref decreases reference count of
GdkGLPixmap by 1 and deletes pixmap if reference count
reaches 0.
SEE ALSO
glXDestroyGLXPixmap
gdk_gl_pixmap_new
gdk_gl_pixmap_ref
---------------------------------------------------------------
NAME
gdk_gl_pixmap_make_current - attach context to glpixmap
C SPECIFICATION
gint gdk_gl_pixmap_make_current( GdkGLPixmap *glpixmap,
GdkGLContext *context )
PARAMETERS
glpixmap
a pointer to GdkGLPixmap
context
a pointer to GdkGLContext
DESCRIPTION
gdk_gl_pixmap_make_current make context current OpenGL
rendering context, and it attaches context to glpixmap.
gdk_gl_pixmap_make_current returns TRUE of successful.
SEE ALSO
glXMakeCurrent
gdk_gl_make_current
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NAME
gdk_gl_use_gdk_font
C SPECIFICATION
void gdk_gl_use_gdk_font( GdkFont *font,
int first,
int count,
int list_base )
PARAMETERS
font
Pointer to GdkFont structure, font type must be GDK_FONT_FONT.
first
Specifies the index of the first font glyph to be taken
count
Specifies the number of glyphs to be taken.
list_base
Specifies the index of the first display list to be generated.
DESCRIPTION
gdk_gl_use_gdk_font generates count display lists, named list_base
through list_base+count-1, each containing a single glBitmap command.
gdk_gl_use_gdk_font is ignored if there is no current context.
SEE ALSO
glXUseXFont
