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COGL 0.8.2 Reference Manual | ![]() |
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gboolean cogl_create_context (void); void cogl_destroy_context (void); #define COGL_INVALID_HANDLE typedef CoglHandle; void (*CoglFuncPtr) (void); enum CoglFeatureFlags; ClutterFeatureFlags cogl_get_features (void); gboolean cogl_features_available (CoglFeatureFlags features); CoglFuncPtr cogl_get_proc_address (const gchar *name); gboolean cogl_check_extension (const gchar *name, const gchar *ext); void cogl_get_bitmasks (gint *red, gint *green, gint *blue, gint *alpha); void cogl_paint_init (const ClutterColor *color); int cogl_util_next_p2 (int a);
#define COGL_INVALID_HANDLE NULL
A COGL handle that is not valid, used for unitialized handles as well as error conditions.
typedef gpointer CoglHandle;
Type used for storing references to cogl objects, the CoglHandle is a fully opaque type without any public data members.
void (*CoglFuncPtr) (void);
The type used by cogl for function pointers, note that this type is used as a generic catch-all cast for function pointers and the actual arguments and return type may be different.
typedef enum { COGL_FEATURE_TEXTURE_RECTANGLE = (1 << 1), COGL_FEATURE_TEXTURE_NPOT = (1 << 2), COGL_FEATURE_TEXTURE_YUV = (1 << 3), COGL_FEATURE_TEXTURE_READ_PIXELS = (1 << 4), COGL_FEATURE_SHADERS_GLSL = (1 << 5), COGL_FEATURE_OFFSCREEN = (1 << 6), COGL_FEATURE_OFFSCREEN_MULTISAMPLE = (1 << 7), COGL_FEATURE_OFFSCREEN_BLIT = (1 << 8), COGL_FEATURE_FOUR_CLIP_PLANES = (1 << 9), COGL_FEATURE_STENCIL_BUFFER = (1 << 10) } CoglFeatureFlags;
Flags for the supported features.
ClutterFeatureFlags cogl_get_features (void);
Returns all of the features supported by COGL.
Returns : |
A logical OR of all the supported COGL features. |
Since 0.8
gboolean cogl_features_available (CoglFeatureFlags features);
Checks whether the given COGL features are available. Multiple
features can be checked for by or-ing them together with the '|'
operator. TRUE
is only returned if all of the requested features
are available.
CoglFuncPtr cogl_get_proc_address (const gchar *name);
Gets a pointer to a given GL or GL ES extension function. This acts
as a wrapper around glXGetProcAddress()
or whatever is the
appropriate function for the current backend.
|
the name of the function. |
Returns : |
a pointer to the requested function or NULL if the
function is not available.
|
gboolean cogl_check_extension (const gchar *name, const gchar *ext);
Check whether name
occurs in list of extensions in ext
.
void cogl_get_bitmasks (gint *red, gint *green, gint *blue, gint *alpha);
Gets the number of bitplanes used for each of the color components
in the color buffer. Pass NULL
for any of the arguments if the
value is not required.
void cogl_paint_init (const ClutterColor *color);
Clears the color buffer to color
. The depth buffer and stencil
buffers are also cleared and fogging and lighting are disabled.
|
Background color to clear to |