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f322da3794
There were a number of functions intended to support creating of new primitives using materials, but at this point they aren't used outside of Cogl so until someone has a usecase and we can get feedback on this API, it's being removed before we release Clutter 1.0.
663 lines
22 KiB
C
663 lines
22 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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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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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_MATERIAL_H__
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#define __COGL_MATERIAL_H__
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G_BEGIN_DECLS
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#include <cogl/cogl-types.h>
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#include <cogl/cogl-matrix.h>
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/**
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* SECTION:cogl-material
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* @short_description: Fuctions for creating and manipulating materials
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*
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* COGL allows creating and manipulating materials used to fill in
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* geometry. Materials may simply be lighting attributes (such as an
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* ambient and diffuse colour) or might represent one or more textures
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* blended together.
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*/
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/**
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* cogl_material_new:
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*
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* Allocates and initializes a blank white material
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*
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* Returns: a handle to the new material
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*/
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CoglHandle cogl_material_new (void);
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/**
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* cogl_material_ref:
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* @handle: a @CoglHandle.
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*
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* Increment the reference count for a cogl material.
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*
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* Returns: the @handle.
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*
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* Since 1.0
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*/
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CoglHandle cogl_material_ref (CoglHandle handle);
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/**
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* cogl_material_unref:
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* @handle: a @CoglHandle.
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*
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* Decrement the reference count for a cogl material.
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*
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* Since 1.0
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*/
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void cogl_material_unref (CoglHandle handle);
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/**
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* cogl_is_material:
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* @handle: A CoglHandle
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*
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* Gets whether the given handle references an existing material object.
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*
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* Returns: %TRUE if the handle references a #CoglMaterial,
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* %FALSE otherwise
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*/
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gboolean cogl_is_material (CoglHandle handle);
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/**
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* cogl_material_set_color:
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* @material: A CoglMaterial object
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* @color: The components of the color
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*
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* This is the basic color of the material, used when no lighting is enabled.
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*
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* The default value is (1.0, 1.0, 1.0, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_color (CoglHandle material, const CoglColor *color);
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/**
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* cogl_material_set_color4ub:
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* @material: A CoglMaterial object
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* @red: The red component
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* @green: The green component
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* @blue: The blue component
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* @alpha: The alpha component
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*
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* This is the basic color of the material, used when no lighting is enabled.
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*
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* The default value is (0xff, 0xff, 0xff, 0xff)
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*
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* Since 1.0
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*/
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void cogl_material_set_color4ub (CoglHandle material,
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guint8 red,
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guint8 green,
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guint8 blue,
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guint8 alpha);
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/**
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* cogl_material_set_color4f:
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* @material: A CoglMaterial object
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* @red: The red component
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* @green: The green component
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* @blue: The blue component
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* @alpha: The alpha component
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*
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* This is the basic color of the material, used when no lighting is enabled.
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*
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* The default value is (1.0, 1.0, 1.0, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_color4f (CoglHandle material,
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float red,
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float green,
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float blue,
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float alpha);
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/**
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* cogl_material_get_color:
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* @material: A CoglMaterial object
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* @color: The location to store the color
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*
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* This retrieves the current material color.
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*
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* Since 1.0
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*/
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void cogl_material_get_color (CoglHandle material, CoglColor *color);
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/**
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* cogl_material_set_ambient:
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* @material: A CoglMaterial object
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* @ambient: The components of the desired ambient color
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*
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* Exposing the standard OpenGL lighting model; this function sets
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* the material's ambient color. The ambient color affects the overall
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* color of the object. Since the diffuse color will be intense when
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* the light hits the surface directly, the ambient will most aparent
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* where the light hits at a slant.
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*
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* The default value is (0.2, 0.2, 0.2, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_ambient (CoglHandle material,
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const CoglColor *ambient);
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/**
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* cogl_material_get_ambient:
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* @material: A CoglMaterial object
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* @ambient: The location to store the ambient color
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*
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* This retrieves the materials current ambient color.
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*
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* Since 1.0
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*/
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void cogl_material_get_ambient (CoglHandle material, CoglColor *ambient);
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/**
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* cogl_material_set_diffuse:
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* @material: A CoglMaterial object
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* @diffuse: The components of the desired diffuse color
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*
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* Exposing the standard OpenGL lighting model; this function sets
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* the material's diffuse color. The diffuse color is most intense
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* where the light hits the surface directly; perpendicular to the
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* surface.
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*
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* The default value is (0.8, 0.8, 0.8, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_diffuse (CoglHandle material,
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const CoglColor *diffuse);
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/**
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* cogl_material_get_diffuse:
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* @material: A CoglMaterial object
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* @diffuse: The location to store the diffuse color
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*
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* This retrieves the materials current diffuse color.
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*
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* Since 1.0
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*/
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void cogl_material_get_diffuse (CoglHandle material, CoglColor *diffuse);
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/**
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* cogl_material_set_ambient_and_diffuse:
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* @material: A CoglMaterial object
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* @color: The components of the desired ambient and diffuse colors
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*
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* This is a convenience for setting the diffuse and ambient color
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* of the material at the same time.
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*
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* The default ambient color is (0.2, 0.2, 0.2, 1.0)
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* The default diffuse color is (0.8, 0.8, 0.8, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_ambient_and_diffuse (CoglHandle material,
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const CoglColor *color);
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/**
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* cogl_material_set_specular:
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* @material: A CoglMaterial object
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* @specular: The components of the desired specular color
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*
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* Exposing the standard OpenGL lighting model; this function sets
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* the material's specular color. The intensity of the specular color
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* depends on the viewport position, and is brightest along the lines
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* of reflection.
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*
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* The default value is (0.0, 0.0, 0.0, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_specular (CoglHandle material,
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const CoglColor *specular);
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/**
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* cogl_material_get_specular:
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* @material: A CoglMaterial object
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* @specular: The location to store the specular color
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*
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* This retrieves the materials current specular color.
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*
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* Since 1.0
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*/
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void cogl_material_get_specular (CoglHandle material, CoglColor *specular);
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/**
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* cogl_material_set_shininess:
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* @material: A CoglMaterial object
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* shininess: The desired shininess; range: [0.0, 1.0]
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*
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* This function sets the materials shininess which determines how
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* specular highlights are calculated. A higher shininess will produce
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* smaller brigher highlights.
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*
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* The default value is 0.0
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*
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* Since 1.0
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*/
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void cogl_material_set_shininess (CoglHandle material,
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float shininess);
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/**
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* cogl_material_get_shininess:
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* @material: A CoglMaterial object
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*
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* This retrieves the materials current emission color.
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*
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* Return value: The materials current shininess value
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*
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* Since 1.0
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*/
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float cogl_material_get_shininess (CoglHandle material);
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/**
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* cogl_material_set_emission:
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* @material: A CoglMaterial object
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* @emission: The components of the desired emissive color
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*
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* Exposing the standard OpenGL lighting model; this function sets
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* the material's emissive color. It will look like the surface is
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* a light source emitting this color.
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*
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* The default value is (0.0, 0.0, 0.0, 1.0)
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*
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* Since 1.0
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*/
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void cogl_material_set_emission (CoglHandle material,
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const CoglColor *emission);
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/**
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* cogl_material_get_emission:
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* @material: A CoglMaterial object
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* @emission: The location to store the emission color
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*
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* This retrieves the materials current emission color.
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*
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* Since 1.0
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*/
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void cogl_material_get_emission (CoglHandle material, CoglColor *emission);
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/**
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* CoglMaterialAlphaFunc:
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* @COGL_MATERIAL_ALPHA_FUNC_NEVER: Never let the fragment through.
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* @COGL_MATERIAL_ALPHA_FUNC_LESS: Let the fragment through if the incoming
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* alpha value is less than the reference alpha
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* value.
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* @COGL_MATERIAL_ALPHA_FUNC_EQUAL: Let the fragment through if the incoming
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* alpha value equals the reference alpha
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* value.
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* @COGL_MATERIAL_ALPHA_FUNC_LEQUAL: Let the fragment through if the incoming
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* alpha value is less than or equal to the
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* reference alpha value.
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* @COGL_MATERIAL_ALPHA_FUNC_GREATER: Let the fragment through if the incoming
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* alpha value is greater than the reference
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* alpha value.
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* @COGL_MATERIAL_ALPHA_FUNC_NOTEQUAL: Let the fragment through if the incoming
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* alpha value does not equal the reference
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* alpha value.
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* @COGL_MATERIAL_ALPHA_FUNC_GEQUAL: Let the fragment through if the incoming
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* alpha value is greater than or equal to the
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* reference alpha value.
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* @COGL_MATERIAL_ALPHA_FUNC_ALWAYS: Always let the fragment through.
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*
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* Alpha testing happens before blending primitives with the framebuffer and
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* gives an opportunity to discard fragments based on a comparison with the
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* incoming alpha value and a reference alpha value. The #CoglMaterialAlphaFunc
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* determines how the comparison is done.
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*/
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typedef enum _CoglMaterialAlphaFunc
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{
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COGL_MATERIAL_ALPHA_FUNC_NEVER = GL_NEVER,
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COGL_MATERIAL_ALPHA_FUNC_LESS = GL_LESS,
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COGL_MATERIAL_ALPHA_FUNC_EQUAL = GL_EQUAL,
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COGL_MATERIAL_ALPHA_FUNC_LEQUAL = GL_LEQUAL,
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COGL_MATERIAL_ALPHA_FUNC_GREATER = GL_GREATER,
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COGL_MATERIAL_ALPHA_FUNC_NOTEQUAL = GL_NOTEQUAL,
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COGL_MATERIAL_ALPHA_FUNC_GEQUAL = GL_GEQUAL,
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COGL_MATERIAL_ALPHA_FUNC_ALWAYS = GL_ALWAYS
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} CoglMaterialAlphaFunc;
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/**
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* cogl_material_set_alpha_test_function:
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* @material: A CoglMaterial object
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* @alpha_func: A @CoglMaterialAlphaFunc constant
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* @alpha_reference: A reference point that the chosen alpha function uses
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* to compare incoming fragments to.
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*
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* Before a primitive is blended with the framebuffer, it goes through an
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* alpha test stage which lets you discard fragments based on the current
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* alpha value. This function lets you change the function used to evaluate
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* the alpha channel, and thus determine which fragments are discarded
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* and which continue on to the blending stage.
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*
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* The default is COGL_MATERIAL_ALPHA_FUNC_ALWAYS
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*
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* Since 1.0
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*/
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void cogl_material_set_alpha_test_function (CoglHandle material,
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CoglMaterialAlphaFunc alpha_func,
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float alpha_reference);
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/**
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* cogl_material_set_blend:
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* @material: A CoglMaterial object
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* @blend_string: A <link linkend="cogl-Blend-Strings">Cogl blend string</link>
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* describing the desired blend function.
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* @error: A GError that may report lack of driver support if you give
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* separate blend string statements for the alpha channel and RGB
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* channels since some drivers or backends such as GLES 1.1 dont
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* support this.
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*
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* If not already familiar; please refer
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* <link linkend="cogl-Blend-Strings">here</link> for an overview of what blend
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* strings are and there syntax.
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*
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* Blending occurs after the alpha test function, and combines fragments with
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* the framebuffer.
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* Currently the only blend function Cogl exposes is ADD(). So any valid
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* blend statements will be of the form:
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*
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* <programlisting>
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* <channel-mask>=ADD(SRC_COLOR*(<factor>), DST_COLOR*(<factor>))
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* </programlisting>
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*
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* <b>NOTE: The brackets around blend factors are currently not optional!</b>
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*
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* This is the list of source-names usable as blend factors:
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* <itemizedlist>
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* <listitem>SRC_COLOR: The color of the in comming fragment</listitem>
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* <listitem>DST_COLOR: The color of the framebuffer</listitem>
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* <listitem>
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* CONSTANT: The constant set via cogl_material_set_blend_constant()</listitem>
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* </itemizedlist>
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* The source names can be used according to the
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* <link linkend="cogl-Blend-String-syntax">color-source and factor syntax</link>,
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* so for example "(1-SRC_COLOR[A])" would be a valid factor, as would
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* "(CONSTANT[RGB])"
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*
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* These can also be used as factors:
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* <itemizedlist>
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* <listitem>0: (0, 0, 0, 0)</listitem>
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* <listitem>1: (1, 1, 1, 1)</listitem>
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* <listitem>SRC_ALPHA_SATURATE_FACTOR: (f,f,f,1)
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* where f=MIN(SRC_COLOR[A],1-DST_COLOR[A])</listitem>
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* </itemizedlist>
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* <para>
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* Remember; all color components are normalized to the range [0, 1] before
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* computing the result of blending.
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* </para>
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* <section>
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* <title>Examples</title>
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* Blend a non-premultiplied source over a destination with
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* premultiplied alpha:
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* <programlisting>
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* "RGB = ADD(SRC_COLOR*(SRC_COLOR[A]), DST_COLOR*(1-SRC_COLOR[A]))"
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* "A = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
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* </programlisting>
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* Blend a premultiplied source over a destination with premultiplied alpha:
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* <programlisting>
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* "RGBA = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
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* </programlisting>
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* </section>
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*
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* Returns: TRUE if the blend string was successfully parsed, and the described
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* blending is supported by the underlying driver/hardware. If there
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* was an error, it returns FALSE.
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*
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* Since: 1.0
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*/
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gboolean cogl_material_set_blend (CoglHandle material,
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const char *blend_string,
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GError **error);
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/**
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* cogl_material_set_blend_constant:
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* @material: A CoglMaterial object
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* @constant_color: The constant color you want
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*
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* When blending is setup to reference a CONSTANT blend factor then
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* blending will depend on the constant set with this function.
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*
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* Since: 1.0
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*/
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void cogl_material_set_blend_constant (CoglHandle material,
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CoglColor *constant_color);
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/**
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* cogl_material_set_layer:
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* @material: A CoglMaterial object
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*
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* In addition to the standard OpenGL lighting model a Cogl material may have
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* one or more layers comprised of textures that can be blended together in
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* order, with a number of different texture combine modes. This function
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* defines a new texture layer.
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*
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* The index values of multiple layers do not have to be consecutive; it is
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* only their relative order that is important.
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*
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* XXX: In the future, we may define other types of material layers, such
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* as purely GLSL based layers.
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*
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* Since 1.0
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*/
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void cogl_material_set_layer (CoglHandle material,
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int layer_index,
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CoglHandle texture);
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/**
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* cogl_material_add_texture:
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* @material: A CoglMaterial object
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* @layer_index: Specifies the layer you want to remove
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*
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* This function removes a layer from your material
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*/
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void cogl_material_remove_layer (CoglHandle material,
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gint layer_index);
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/**
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* cogl_material_set_layer_combine:
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* @material: A CoglMaterial object
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* @layer_index: Specifies the layer you want define a combine function for
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* @blend_string: A <link linkend="cogl-Blend-Strings">Cogl blend string</link>
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* describing the desired texture combine function.
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* @error: A GError that may report parse errors or lack of GPU/driver support.
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*
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* If not already familiar; you can refer
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* <link linkend="cogl-Blend-Strings">here</link> for an overview of what blend
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* strings are and there syntax.
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*
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* These are all the functions available for texture combining:
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* <itemizedlist>
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* <listitem>REPLACE(arg0) = arg0</listitem>
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* <listitem>MODULATE(arg0, arg1) = arg0 x arg1</listitem>
|
|
* <listitem>ADD(arg0, arg1) = arg0 + arg1</listitem>
|
|
* <listitem>ADD_SIGNED(arg0, arg1) = arg0 + arg1 - 0.5</listitem>
|
|
* <listitem>INTERPOLATE(arg0, arg1, arg2) =
|
|
* arg0 x arg2 + arg1 x (1 - arg2)</listitem>
|
|
* <listitem>SUBTRACT(arg0, arg1) = arg0 - arg1</listitem>
|
|
* <listitem>
|
|
* DOT3_RGB(arg0, arg1) =
|
|
* <programlisting>
|
|
* 4 x ((arg0[R] - 0.5)) * (arg1[R] - 0.5) +
|
|
* (arg0[G] - 0.5)) * (arg1[G] - 0.5) +
|
|
* (arg0[B] - 0.5)) * (arg1[B] - 0.5))
|
|
* </programlisting>
|
|
* </listitem>
|
|
* <listitem>DOT3_RGBA(arg0, arg1) =
|
|
* <programlisting>
|
|
* 4 x ((arg0[R] - 0.5)) * (arg1[R] - 0.5) +
|
|
* (arg0[G] - 0.5)) * (arg1[G] - 0.5) +
|
|
* (arg0[B] - 0.5)) * (arg1[B] - 0.5))
|
|
* </programlisting>
|
|
* </listitem>
|
|
* </itemizedlist>
|
|
*
|
|
* Refer to the
|
|
* <link linkend="cogl-Blend-String-syntax">color-source syntax</link> for
|
|
* describing the arguments. The valid source names for texture combining
|
|
* are:
|
|
* <itemizedlist>
|
|
* <listitem>
|
|
* TEXTURE: Use the color from the current texture layer
|
|
* </listitem>
|
|
* <listitem>
|
|
* TEXTURE_0, TEXTURE_1, etc: Use the color from the specified texture layer
|
|
* </listitem>
|
|
* <listitem>
|
|
* CONSTANT: Use the color from the constant given with
|
|
* cogl_material_set_layer_constant()
|
|
* </listitem>
|
|
* <listitem>
|
|
* PRIMARY: Use the color of the material as set with cogl_material_set_color()
|
|
* </listitem>
|
|
* <listitem>
|
|
* PREVIOUS: Either use the texture color from the previous layer, or if this
|
|
* is layer 0, use the color of the material as set with
|
|
* cogl_material_set_color()
|
|
* </listitem>
|
|
* </itemizedlist>
|
|
* <section>
|
|
* <title>Example</title>
|
|
* This is effectively what the default blending is:
|
|
* <programlisting>
|
|
* "RGBA = MODULATE (PREVIOUS, TEXTURE)"
|
|
* </programlisting>
|
|
* This could be used to cross-fade between two images, using the alpha
|
|
* component of a constant as the interpolator. The constant color
|
|
* is given by calling cogl_material_set_layer_constant.
|
|
* <programlisting>
|
|
* RGBA = INTERPOLATE (PREVIOUS, TEXTURE, CONSTANT[A])
|
|
* </programlisting>
|
|
* </section>
|
|
* <b>Note: you can't give a multiplication factor for arguments as you can
|
|
* with blending.</b>
|
|
*
|
|
* Returns: TRUE if the blend string was successfully parsed, and the described
|
|
* texture combining is supported by the underlying driver/hardware.
|
|
* If there was an error, it returns FALSE.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
gboolean
|
|
cogl_material_set_layer_combine (CoglHandle material,
|
|
gint layer_index,
|
|
const char *blend_string,
|
|
GError **error);
|
|
|
|
/**
|
|
* cogl_material_set_layer_combine_constant:
|
|
* @material: A CoglMaterial object
|
|
* @layer_index: Specifies the layer you want to specify a constant used
|
|
* for texture combining
|
|
* @color_constant: The constant color you want
|
|
*
|
|
* When you are using the 'CONSTANT' color source in a layer combine
|
|
* description then you can use this function to define its value.
|
|
*
|
|
* Since 1.0
|
|
*/
|
|
void cogl_material_set_layer_combine_constant (CoglHandle material,
|
|
int layer_index,
|
|
CoglColor *constant);
|
|
|
|
/**
|
|
* cogl_material_set_layer_matrix:
|
|
* @material: A CoglMaterial object
|
|
*
|
|
* This function lets you set a matrix that can be used to e.g. translate
|
|
* and rotate a single layer of a material used to fill your geometry.
|
|
*/
|
|
void cogl_material_set_layer_matrix (CoglHandle material,
|
|
int layer_index,
|
|
CoglMatrix *matrix);
|
|
|
|
/**
|
|
* cogl_material_get_layers:
|
|
* @material: A CoglMaterial object
|
|
*
|
|
* This function lets you access a materials internal list of layers
|
|
* for iteration.
|
|
*
|
|
* Returns: A list of #CoglHandle<!-- -->'s that can be passed to the
|
|
* cogl_material_layer_* functions.
|
|
*/
|
|
const GList *cogl_material_get_layers (CoglHandle material_handle);
|
|
|
|
/**
|
|
* CoglMaterialLayerType:
|
|
* @COGL_MATERIAL_LAYER_TYPE_TEXTURE: The layer represents a
|
|
* <link linkend="cogl-Textures">Cogl texture</link>
|
|
*/
|
|
typedef enum _CoglMaterialLayerType
|
|
{
|
|
COGL_MATERIAL_LAYER_TYPE_TEXTURE
|
|
} CoglMaterialLayerType;
|
|
|
|
/**
|
|
* cogl_material_layer_get_type:
|
|
* @layer_handle: A Cogl material layer handle
|
|
*
|
|
* Currently there is only one type of layer defined:
|
|
* COGL_MATERIAL_LAYER_TYPE_TEXTURE, but considering we may add purely GLSL
|
|
* based layers in the future, you should write code that checks the type
|
|
* first.
|
|
*/
|
|
CoglMaterialLayerType cogl_material_layer_get_type (CoglHandle layer_handle);
|
|
|
|
/**
|
|
* cogl_material_layer_get_texture:
|
|
* @layer_handle: A CoglMaterialLayer handle
|
|
*
|
|
* This lets you extract a CoglTexture handle for a specific layer.
|
|
*
|
|
* Note: In the future, we may support purely GLSL based layers which will
|
|
* likely return COGL_INVALID_HANDLE if you try to get the texture.
|
|
* Considering this, you can call cogl_material_layer_get_type first,
|
|
* to check it is of type COGL_MATERIAL_LAYER_TYPE_TEXTURE.
|
|
*
|
|
* Note: It is possible for a layer object of type
|
|
* COGL_MATERIAL_LAYER_TYPE_TEXTURE to be realized before a texture
|
|
* object has been associated with the layer. For example this happens
|
|
* if you setup layer combining for a given layer index before calling
|
|
* cogl_material_set_layer for that index.
|
|
*
|
|
* Returns: A CoglHandle to the layers texture object or COGL_INVALID_HANDLE
|
|
* if a texture has not been set yet.
|
|
*/
|
|
CoglHandle cogl_material_layer_get_texture (CoglHandle layer_handle);
|
|
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_MATERIAL_H__ */
|
|
|