1bcdf7d9eb
Bug 1219 - Clean up cogl.h * clutter/cogl/cogl.h.in: * clutter/cogl/cogl-offscreen.h: * clutter/cogl/cogl-path.h: * clutter/cogl/cogl-shader.h: * clutter/cogl/cogl-texture.h: * clutter/cogl/cogl-types.h: Split up the massive cogl.h file into sub-header for each section of the API. * clutter/cogl/gl/*: * clutter/cogl/gles/*: Update the GL and GLES implementations of COGL to cope with the new header structure. * doc/reference/cogl/Makefile.am: Fix symbol retrieval.
439 lines
15 KiB
C
439 lines
15 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __COGL_H__
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#define __COGL_H__
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#define __COGL_H_INSIDE__
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#include <glib.h>
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#include <cogl/cogl-defines-@CLUTTER_COGL@.h>
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#include <cogl/cogl-fixed.h>
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#include <cogl/cogl-color.h>
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#include <cogl/cogl-offscreen.h>
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#include <cogl/cogl-path.h>
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#include <cogl/cogl-shader.h>
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#include <cogl/cogl-texture.h>
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#include <cogl/cogl-types.h>
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G_BEGIN_DECLS
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/**
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* SECTION:cogl
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* @short_description: General purpose API
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*
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* General utility functions for COGL.
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*/
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/* Context manipulation */
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/**
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* cogl_create_context:
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*
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* FIXME
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*/
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gboolean cogl_create_context (void);
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/**
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* cogl_destroy_context:
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*
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* FIXME
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*/
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void cogl_destroy_context (void);
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/* Misc */
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/**
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* cogl_get_features:
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*
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* Returns all of the features supported by COGL.
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*
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* Return value: A logical OR of all the supported COGL features.
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*
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* Since: 0.8
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*/
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CoglFeatureFlags cogl_get_features (void);
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/**
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* cogl_features_available:
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* @features: A bitmask of features to check for
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*
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* Checks whether the given COGL features are available. Multiple
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* features can be checked for by or-ing them together with the '|'
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* operator. %TRUE is only returned if all of the requested features
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* are available.
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*
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* Return value: %TRUE if the features are available, %FALSE otherwise.
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*/
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gboolean cogl_features_available (CoglFeatureFlags features);
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/**
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* cogl_get_proc_address:
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* @name: the name of the function.
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*
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* Gets a pointer to a given GL or GL ES extension function. This acts
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* as a wrapper around glXGetProcAddress() or whatever is the
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* appropriate function for the current backend.
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*
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* Return value: a pointer to the requested function or %NULL if the
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* function is not available.
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*/
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CoglFuncPtr cogl_get_proc_address (const gchar *name);
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/**
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* cogl_check_extension:
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* @name: extension to check for
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* @ext: list of extensions
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*
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* Check whether @name occurs in list of extensions in @ext.
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*
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* Returns: %TRUE if the extension occurs in the list, %FALSE otherwize.
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*/
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gboolean cogl_check_extension (const gchar *name,
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const gchar *ext);
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/**
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* cogl_get_bitmasks:
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* @red: Return location for the number of red bits or %NULL
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* @green: Return location for the number of green bits or %NULL
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* @blue: Return location for the number of blue bits or %NULL
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* @alpha: Return location for the number of alpha bits or %NULL
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*
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* Gets the number of bitplanes used for each of the color components
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* in the color buffer. Pass %NULL for any of the arguments if the
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* value is not required.
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*/
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void cogl_get_bitmasks (gint *red,
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gint *green,
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gint *blue,
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gint *alpha);
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/**
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* cogl_perspective:
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* @fovy: Vertical of view angle in degrees.
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* @aspect: Aspect ratio of diesplay
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* @z_near: Nearest visible point
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* @z_far: Furthest visible point along the z-axis
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*
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* Replaces the current projection matrix with a perspective matrix
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* based on the provided values.
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*/
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void cogl_perspective (CoglFixed fovy,
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CoglFixed aspect,
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CoglFixed z_near,
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CoglFixed z_far);
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/**
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* cogl_frustum:
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* @left: Left clipping plane
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* @right: Right clipping plane
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* @bottom: Bottom clipping plane
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* @top: Top clipping plane
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* @z_near: Nearest visible point
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* @z_far: Furthest visible point along the z-axis
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*
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* Replaces the current projection matrix with a perspective matrix
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* for the given viewing frustum.
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*
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* Since: 0.8.2
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*/
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void cogl_frustum (CoglFixed left,
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CoglFixed right,
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CoglFixed bottom,
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CoglFixed top,
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CoglFixed z_near,
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CoglFixed z_far);
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/**
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* cogl_setup_viewport:
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* @width: Width of the viewport
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* @height: Height of the viewport
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* @fovy: Field of view angle in degrees
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* @aspect: Aspect ratio to determine the field of view along the x-axis
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* @z_near: Nearest visible point along the z-axis
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* @z_far: Furthest visible point along the z-axis
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*
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* Replaces the current viewport and projection matrix with the given
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* values. The viewport is placed at the top left corner of the window
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* with the given width and height. The projection matrix is replaced
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* with one that has a viewing angle of @fovy along the y-axis and a
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* view scaled according to @aspect along the x-axis. The view is
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* clipped according to @z_near and @z_far on the z-axis.
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*/
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void cogl_setup_viewport (guint width,
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guint height,
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CoglFixed fovy,
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CoglFixed aspect,
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CoglFixed z_near,
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CoglFixed z_far);
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/**
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* cogl_viewport:
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* @width: Width of the viewport
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* @height: Height of the viewport
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*
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* Replace the current viewport with the given values.
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*
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* Since: 0.8.2
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*/
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void cogl_viewport (guint width,
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guint height);
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/**
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* cogl_push_matrix:
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*
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* Store the current model-view matrix on the matrix stack. The matrix
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* can later be restored with cogl_pop_matrix().
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*/
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void cogl_push_matrix (void);
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/**
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* cogl_pop_matrix:
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*
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* Restore the current model-view matrix from the matrix stack.
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*/
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void cogl_pop_matrix (void);
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/**
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* cogl_scale:
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* @x: Amount to scale along the x-axis
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* @y: Amount to scale along the y-axis
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*
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* Multiplies the current model-view matrix by one that scales the x
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* and y axes by the given values.
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*/
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void cogl_scale (CoglFixed x,
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CoglFixed y);
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/**
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* cogl_translatex:
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* @x: Distance to translate along the x-axis
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* @y: Distance to translate along the y-axis
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* @z: Distance to translate along the z-axis
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*
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* Multiplies the current model-view matrix by one that translates the
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* model along all three axes according to the given values.
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*/
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void cogl_translatex (CoglFixed x,
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CoglFixed y,
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CoglFixed z);
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/**
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* cogl_translate:
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* @x: Distance to translate along the x-axis
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* @y: Distance to translate along the y-axis
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* @z: Distance to translate along the z-axis
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*
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* Integer version of cogl_translatex(). Multiplies the current
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* model-view matrix by one that translates the model along all three
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* axes according to the given values.
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*/
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void cogl_translate (gint x,
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gint y,
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gint z);
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/**
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* cogl_rotatex:
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* @angle: Angle in degrees to rotate.
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* @x: X-component of vertex to rotate around.
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* @y: Y-component of vertex to rotate around.
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* @z: Z-component of vertex to rotate around.
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*
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* Multiplies the current model-view matrix by one that rotates the
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* model around the vertex specified by @x, @y and @z. The rotation
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* follows the right-hand thumb rule so for example rotating by 10
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* degrees about the vertex (0, 0, 1) causes a small counter-clockwise
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* rotation.
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*/
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void cogl_rotatex (CoglFixed angle,
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gint x,
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gint y,
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gint z);
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/**
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* cogl_rotate:
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* @angle: Angle in degrees to rotate.
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* @x: X-component of vertex to rotate around.
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* @y: Y-component of vertex to rotate around.
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* @z: Z-component of vertex to rotate around.
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*
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* Integer version of cogl_rotatex(). Multiplies the current
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* model-view matrix by one that rotates the model around the vertex
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* specified by @x, @y and @z.
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*/
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void cogl_rotate (gint angle,
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gint x,
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gint y,
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gint z);
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/**
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* cogl_get_modelview_matrix:
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* @m: pointer to a 4x4 array of #CoglFixed<!-- -->s to receive the matrix
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*
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* Stores the current model-view matrix in @m. The matrix is in
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* column-major order.
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*/
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void cogl_get_modelview_matrix (CoglFixed m[16]);
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/**
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* cogl_get_projection_matrix:
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* @m: pointer to a 4x4 array of #CoglFixed<!-- -->s to receive the matrix
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*
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* Stores the current projection matrix in @m. The matrix is in
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* column-major order.
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*/
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void cogl_get_projection_matrix (CoglFixed m[16]);
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/**
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* cogl_get_viewport:
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* @v: pointer to a 4 element array of #CoglFixed<!-- -->s to
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* receive the viewport dimensions.
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*
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* Stores the current viewport in @v. @v[0] and @v[1] get the x and y
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* position of the viewport and @v[2] and @v[3] get the width and
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* height.
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*/
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void cogl_get_viewport (CoglFixed v[4]);
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/**
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* cogl_clip_set:
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* @x_offset: left edge of the clip rectangle
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* @y_offset: top edge of the clip rectangle
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* @width: width of the clip rectangle
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* @height: height of the clip rectangle
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*
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* Specifies a rectangular clipping area for all subsequent drawing
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* operations. Any drawing commands that extend outside the rectangle
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* will be clipped so that only the portion inside the rectangle will
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* be displayed. The rectangle dimensions are transformed by the
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* current model-view matrix.
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*/
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void cogl_clip_set (CoglFixed x_offset,
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CoglFixed y_offset,
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CoglFixed width,
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CoglFixed height);
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/**
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* cogl_clip_unset:
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*
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* Removes the current clipping rectangle so that all drawing
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* operations extend to full size of the viewport again.
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*/
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void cogl_clip_unset (void);
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/**
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* cogl_clip_stack_save:
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*
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* Save the entire state of the clipping stack and then clear all
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* clipping. The previous state can be returned to with
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* cogl_clip_stack_restore(). Each call to cogl_clip_set() after this
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* must be matched by a call to cogl_clip_unset() before calling
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* cogl_clip_stack_restore().
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*
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* Since: 0.8.2
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*/
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void cogl_clip_stack_save (void);
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/**
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* cogl_clip_stack_restore:
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*
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* Restore the state of the clipping stack that was previously saved
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* by cogl_clip_stack_save().
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*
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* Since: 0.8.2
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*/
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void cogl_clip_stack_restore (void);
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/**
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* cogl_enable_depth_test:
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* @setting: %TRUE to enable depth testing or %FALSE to disable.
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*
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* Sets whether depth testing is enabled. If it is disabled then the
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* order that actors are layered on the screen depends solely on the
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* order specified using clutter_actor_raise() and
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* clutter_actor_lower(), otherwise it will also take into account the
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* actor's depth. Depth testing is disabled by default.
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*/
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void cogl_enable_depth_test (gboolean setting);
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/**
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* cogl_enable_backface_culling:
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* @setting: %TRUE to enable backface culling or %FALSE to disable.
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*
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* Sets whether textures positioned so that their backface is showing
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* should be hidden. This can be used to efficiently draw two-sided
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* textures or fully closed cubes without enabling depth testing. Only
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* calls to cogl_texture_rectangle() and cogl_texture_polygon() are
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* affected. Backface culling is disabled by default.
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*/
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void cogl_enable_backface_culling (gboolean setting);
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/**
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* cogl_alpha_func:
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* @func: the comparison function to use, one of CGL_NEVER, CGL_LESS,
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* CGL_EQUAL, CGL_LEQUAL, CGL_GREATER, CGL_NOTEQUAL, CGL_GEQUAL and GL_ALWAYS.
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* @ref: reference value.
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*
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* Changes the alpha test to use the specified function specified in @func,
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* comparing with the value in @ref. The default function is CGL_ALWAYS the
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* initial reference value is 1.0.
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*/
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void cogl_alpha_func (COGLenum func,
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CoglFixed ref);
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/**
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* cogl_fog_set:
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* @fog_color: The color of the fog
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* @density: Ignored
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* @z_near: Position along z-axis where no fogging should be applied
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* @z_far: Position along z-axes where full fogging should be applied
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*
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* Enables fogging. Fogging causes vertices that are further away from
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* the eye to be rendered with a different color. The color is
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* linearly interpolated so that vertices at @z_near are drawn fully
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* with their original color and vertices at @z_far are drawn fully
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* with @fog_color. Fogging will remain enabled until the next call to
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* cogl_paint_init().
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*/
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void cogl_fog_set (const CoglColor *fog_color,
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CoglFixed density,
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CoglFixed z_near,
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CoglFixed z_far);
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/**
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* cogl_paint_init:
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* @color: Background color to clear to
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*
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* Clears the color buffer to @color. The depth buffer and stencil
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* buffers are also cleared and fogging and lighting are disabled.
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*/
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void cogl_paint_init (const CoglColor *color);
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G_END_DECLS
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#undef __COGL_H_INSIDE__
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#endif /* __COGL_H__ */
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