282abe91f7
We strongly suggest people should be using cogl_material_copy(), but it was hidden behind the deprecation guards.
805 lines
27 KiB
C
805 lines
27 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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* CoglMaterialFilter:
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* @COGL_MATERIAL_FILTER_NEAREST: Measuring in manhatten distance from the,
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* current pixel center, use the nearest texture texel
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* @COGL_MATERIAL_FILTER_LINEAR: Use the weighted average of the 4 texels
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* nearest the current pixel center
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* @COGL_MATERIAL_FILTER_NEAREST_MIPMAP_NEAREST: Select the mimap level whose
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* texel size most closely matches the current pixel, and use the
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* %COGL_MATERIAL_FILTER_NEAREST criterion
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* @COGL_MATERIAL_FILTER_LINEAR_MIPMAP_NEAREST: Select the mimap level whose
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* texel size most closely matches the current pixel, and use the
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* %COGL_MATERIAL_FILTER_LINEAR criterion
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* @COGL_MATERIAL_FILTER_NEAREST_MIPMAP_LINEAR: Select the two mimap levels
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* whose texel size most closely matches the current pixel, use
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* the %COGL_MATERIAL_FILTER_NEAREST criterion on each one and take
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* their weighted average
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* @COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR: Select the two mimap levels
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* whose texel size most closely matches the current pixel, use
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* the %COGL_MATERIAL_FILTER_LINEAR criterion on each one and take
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* their weighted average
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*
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* Texture filtering is used whenever the current pixel maps either to more
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* than one texture element (texel) or less than one. These filter enums
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* correspond to different strategies used to come up with a pixel color, by
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* possibly referring to multiple neighbouring texels and taking a weighted
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* average or simply using the nearest texel.
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*/
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typedef enum {
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COGL_MATERIAL_FILTER_NEAREST = GL_NEAREST,
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COGL_MATERIAL_FILTER_LINEAR = GL_LINEAR,
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COGL_MATERIAL_FILTER_NEAREST_MIPMAP_NEAREST = GL_NEAREST_MIPMAP_NEAREST,
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COGL_MATERIAL_FILTER_LINEAR_MIPMAP_NEAREST = GL_LINEAR_MIPMAP_NEAREST,
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COGL_MATERIAL_FILTER_NEAREST_MIPMAP_LINEAR = GL_NEAREST_MIPMAP_LINEAR,
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COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR = GL_LINEAR_MIPMAP_LINEAR
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} CoglMaterialFilter;
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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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* Return value: 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_copy:
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*
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* Creates a new material handle with the configuration copied from the
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* source material.
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*
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* We would strongly advise developers to always aim to use
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* cogl_material_copy() instead of cogl_material_new() whenever there will
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* be any similarity between two materials. Copying a material helps Cogl
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* keep track of a materials ancestry which we may use to help minimize GPU
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* state changes.
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*
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* Returns: a handle to the new material
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*
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* Since: 1.2
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*/
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CoglHandle cogl_material_copy (CoglHandle source);
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#ifndef COGL_DISABLE_DEPRECATED
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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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* Return value: the @handle.
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*
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* Since: 1.0
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*
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* Deprecated: 1.2: Use cogl_handle_ref() instead
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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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* Deprecated: 1.2: Use cogl_handle_unref() instead
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*/
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void cogl_material_unref (CoglHandle handle);
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#endif /* COGL_DISABLE_DEPRECATED */
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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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* Return value: %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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* Sets the basic color of the material, used when no lighting is enabled.
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*
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* Note that if you don't add any layers to the material then the color
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* will be blended unmodified with the destination; the default blend
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* expects premultiplied colors: for example, use (0.5, 0.0, 0.0, 0.5) for
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* semi-transparent red. See cogl_color_premultiply().
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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,
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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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* Sets 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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* Sets 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: (out): The location to store the color
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*
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* 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,
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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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* Sets the material's ambient color, in the standard OpenGL lighting
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* model. The ambient color affects the overall color of the object.
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*
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* Since the diffuse color will be intense when the light hits the surface
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* directly, the ambient will be most apparent where the light hits at a
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* 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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* Retrieves the current ambient color for @material
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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,
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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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* Sets the material's diffuse color, in the standard OpenGL lighting
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* model. The diffuse color is most intense where the light hits the
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* surface directly - perpendicular to the 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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* Retrieves the current diffuse color for @material
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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,
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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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* Conveniently sets the diffuse and ambient color of @material at the same
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* time. See cogl_material_set_ambient() and cogl_material_set_diffuse().
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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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*
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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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* Sets the material's specular color, in the standard OpenGL lighting
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* model. The intensity of the specular color depends on the viewport
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* position, and is brightest along the lines 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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* 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,
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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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* Sets the materials shininess, in the standard OpenGL lighting model,
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* which determines how specular highlights are calculated. A higher
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* @shininess will produce 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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* 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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* Sets the material's emissive color, in the standard OpenGL lighting
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* model. It will look like the surface is a light source emitting this
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* 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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* 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,
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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 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 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 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 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 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 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 {
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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: return location for a #GError that may report lack of driver
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* support if you give separate blend string statements for the alpha
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* channel and RGB channels since some drivers, or backends such as
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* GLES 1.1, don't support this feature. May be %NULL, in which case a
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* warning will be printed out using GLib's logging facilities if an
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* error is encountered.
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*
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* If not already familiar; please refer <link linkend="cogl-Blend-Strings">here</link>
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* for an overview of what blend strings are, and their 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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* |[
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* <channel-mask>=ADD(SRC_COLOR*(<factor>), DST_COLOR*(<factor>))
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* ]|
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*
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* <warning>The brackets around blend factors are currently not
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* optional!</warning>
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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><para>SRC_COLOR: The color of the in comming fragment</para></listitem>
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* <listitem><para>DST_COLOR: The color of the framebuffer</para></listitem>
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* <listitem><para>CONSTANT: The constant set via cogl_material_set_blend_constant()</para></listitem>
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* </itemizedlist>
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*
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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) where f = MIN(SRC_COLOR[A],1-DST_COLOR[A])</listitem>
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* </itemizedlist>
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*
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* <note>Remember; all color components are normalized to the range [0, 1]
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* before computing the result of blending.</note>
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*
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* <example id="cogl-Blend-Strings-blend-unpremul">
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* <title>Blend Strings/1</title>
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* <para>Blend a non-premultiplied source over a destination with
|
|
* premultiplied alpha:</para>
|
|
* <programlisting>
|
|
* "RGB = ADD(SRC_COLOR*(SRC_COLOR[A]), DST_COLOR*(1-SRC_COLOR[A]))"
|
|
* "A = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
|
|
* </programlisting>
|
|
* </example>
|
|
*
|
|
* <example id="cogl-Blend-Strings-blend-premul">
|
|
* <title>Blend Strings/2</title>
|
|
* <para>Blend a premultiplied source over a destination with
|
|
* premultiplied alpha</para>
|
|
* <programlisting>
|
|
* "RGBA = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
|
|
* </programlisting>
|
|
* </example>
|
|
*
|
|
* The default blend string is:
|
|
* |[
|
|
* RGBA = ADD (SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))
|
|
* ]|
|
|
*
|
|
* That gives normal alpha-blending when the calculated color for the material
|
|
* is in premultiplied form.
|
|
*
|
|
* Return value: %TRUE if the blend string was successfully parsed, and the
|
|
* described blending is supported by the underlying driver/hardware. If
|
|
* there was an error, %FALSE is returned and @error is set accordingly (if
|
|
* present).
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
gboolean cogl_material_set_blend (CoglHandle material,
|
|
const char *blend_string,
|
|
GError **error);
|
|
|
|
/**
|
|
* cogl_material_set_blend_constant:
|
|
* @material: A CoglMaterial object
|
|
* @constant_color: The constant color you want
|
|
*
|
|
* When blending is setup to reference a CONSTANT blend factor then
|
|
* blending will depend on the constant set with this function.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void cogl_material_set_blend_constant (CoglHandle material,
|
|
CoglColor *constant_color);
|
|
|
|
/**
|
|
* cogl_material_set_layer:
|
|
* @material: A #CoglHandle for a material object
|
|
* @layer_index: the index of the layer
|
|
* @texture: a #CoglHandle for the layer object
|
|
*
|
|
* In addition to the standard OpenGL lighting model a Cogl material may have
|
|
* one or more layers comprised of textures that can be blended together in
|
|
* order, with a number of different texture combine modes. This function
|
|
* defines a new texture layer.
|
|
*
|
|
* The index values of multiple layers do not have to be consecutive; it is
|
|
* only their relative order that is important.
|
|
*
|
|
* <note>In the future, we may define other types of material layers, such
|
|
* as purely GLSL based layers.</note>
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
void cogl_material_set_layer (CoglHandle material,
|
|
int layer_index,
|
|
CoglHandle texture);
|
|
|
|
/**
|
|
* cogl_material_remove_layer:
|
|
* @material: A CoglMaterial object
|
|
* @layer_index: Specifies the layer you want to remove
|
|
*
|
|
* This function removes a layer from your material
|
|
*/
|
|
void cogl_material_remove_layer (CoglHandle material,
|
|
gint layer_index);
|
|
|
|
|
|
/**
|
|
* cogl_material_set_layer_combine:
|
|
* @material: A CoglMaterial object
|
|
* @layer_index: Specifies the layer you want define a combine function for
|
|
* @blend_string: A <link linkend="cogl-Blend-Strings">Cogl blend string</link>
|
|
* describing the desired texture combine function.
|
|
* @error: A #GError that may report parse errors or lack of GPU/driver
|
|
* support. May be %NULL, in which case a warning will be printed out if an
|
|
* error is encountered.
|
|
*
|
|
* If not already familiar; you can refer
|
|
* <link linkend="cogl-Blend-Strings">here</link> for an overview of what blend
|
|
* strings are and there syntax.
|
|
*
|
|
* These are all the functions available for texture combining:
|
|
* <itemizedlist>
|
|
* <listitem>REPLACE(arg0) = arg0</listitem>
|
|
* <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>
|
|
* <programlisting>
|
|
* DOT3_RGB(arg0, arg1) = 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>
|
|
* <programlisting>
|
|
* DOT3_RGBA(arg0, arg1) = 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:
|
|
* <variablelist>
|
|
* <varlistentry>
|
|
* <term>TEXTURE</term>
|
|
* <listitem>Use the color from the current texture layer</listitem>
|
|
* </varlistentry>
|
|
* <varlistentry>
|
|
* <term>TEXTURE_0, TEXTURE_1, etc</term>
|
|
* <listitem>Use the color from the specified texture layer</listitem>
|
|
* </varlistentry>
|
|
* <varlistentry>
|
|
* <term>CONSTANT</term>
|
|
* <listitem>Use the color from the constant given with
|
|
* cogl_material_set_layer_constant()</listitem>
|
|
* </varlistentry>
|
|
* <varlistentry>
|
|
* <term>PRIMARY</term>
|
|
* <listitem>Use the color of the material as set with
|
|
* cogl_material_set_color()</listitem>
|
|
* </varlistentry>
|
|
* <varlistentry>
|
|
* <term>PREVIOUS</term>
|
|
* <listitem>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>
|
|
* </varlistentry>
|
|
* </variablelist>
|
|
*
|
|
* <refsect2 id="cogl-Layer-Combine-Examples">
|
|
* <title>Layer Combine Examples</title>
|
|
* <para>This is effectively what the default blending is:</para>
|
|
* <informalexample><programlisting>
|
|
* RGBA = MODULATE (PREVIOUS, TEXTURE)
|
|
* </programlisting></informalexample>
|
|
* <para>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.</para>
|
|
* <informalexample><programlisting>
|
|
* RGBA = INTERPOLATE (PREVIOUS, TEXTURE, CONSTANT[A])
|
|
* </programlisting></informalexample>
|
|
* </refsect2>
|
|
*
|
|
* <note>You can't give a multiplication factor for arguments as you can
|
|
* with blending.</note>
|
|
*
|
|
* Return value: %TRUE if the blend string was successfully parsed, and the
|
|
* described texture combining is supported by the underlying driver and
|
|
* or hardware. On failure, %FALSE is returned and @error is set
|
|
*
|
|
* 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
|
|
* @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
|
|
* @layer_index: the index for the layer inside @material
|
|
* @matrix: the transformation matrix for the layer
|
|
*
|
|
* 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 #CoglHandle for a material
|
|
*
|
|
* This function lets you access a materials internal list of layers
|
|
* for iteration.
|
|
*
|
|
* Return value: (element-type Handle) (transfer none): A list of
|
|
* #CoglHandle<!-- -->'s that can be passed to the cogl_material_layer_*
|
|
* functions. The list is owned by COGL and it should not be modified or
|
|
* freed
|
|
*/
|
|
G_CONST_RETURN GList *cogl_material_get_layers (CoglHandle material);
|
|
|
|
/**
|
|
* cogl_material_get_n_layers:
|
|
* @material: a #CoglHandle for a material
|
|
*
|
|
* Retrieves the number of layers defined for the given @material
|
|
*
|
|
* Return value: the number of layers
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
int cogl_material_get_n_layers (CoglHandle material);
|
|
|
|
/**
|
|
* CoglMaterialLayerType:
|
|
* @COGL_MATERIAL_LAYER_TYPE_TEXTURE: The layer represents a
|
|
* <link linkend="cogl-Textures">texture</link>
|
|
*
|
|
* Available types of layers for a #CoglMaterial. This enumeration
|
|
* might be expanded in later versions.
|
|
*
|
|
* Since: 1.0
|
|
*/
|
|
typedef enum {
|
|
COGL_MATERIAL_LAYER_TYPE_TEXTURE
|
|
} CoglMaterialLayerType;
|
|
|
|
|
|
/**
|
|
* cogl_material_layer_get_type:
|
|
* @layer: A #CoglHandle for a material layer
|
|
*
|
|
* Retrieves the type of the layer
|
|
*
|
|
* 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.
|
|
*
|
|
* Return value: the type of the layer
|
|
*/
|
|
CoglMaterialLayerType cogl_material_layer_get_type (CoglHandle layer);
|
|
|
|
/**
|
|
* cogl_material_layer_get_texture:
|
|
* @layer: A #CoglHandle for a material layer
|
|
*
|
|
* Extracts a texture handle for a specific layer.
|
|
*
|
|
* <note>In the future Cogl may support purely GLSL based layers; for those
|
|
* layers this function which will likely return %COGL_INVALID_HANDLE if you
|
|
* try to get the texture handle from them. Considering this scenario, you
|
|
* should call cogl_material_layer_get_type() first in order check it is of
|
|
* type %COGL_MATERIAL_LAYER_TYPE_TEXTURE before calling this function.</note>
|
|
*
|
|
* Return value: a #CoglHandle for the texture inside the layer
|
|
*/
|
|
CoglHandle cogl_material_layer_get_texture (CoglHandle layer);
|
|
|
|
/**
|
|
* cogl_material_layer_get_min_filter:
|
|
* @layer: a #CoglHandle for a material layer
|
|
*
|
|
* Queries the currently set downscaling filter for a material layer
|
|
*
|
|
* Return value: the current downscaling filter
|
|
*/
|
|
CoglMaterialFilter cogl_material_layer_get_min_filter (CoglHandle layer);
|
|
|
|
/**
|
|
* cogl_material_layer_get_mag_filter:
|
|
* @layer: a #CoglHandle for a material layer
|
|
*
|
|
* Queries the currently set downscaling filter for a material later
|
|
*
|
|
* Return value: the current downscaling filter
|
|
*/
|
|
CoglMaterialFilter cogl_material_layer_get_mag_filter (CoglHandle layer);
|
|
|
|
/**
|
|
* cogl_material_set_layer_filters:
|
|
* @material: a #CoglHandle to a material.
|
|
* @layer_index: the layer number to change.
|
|
* @min_filter: the filter used when scaling a texture down.
|
|
* @mag_filter: the filter used when magnifying a texture.
|
|
*
|
|
* Changes the decimation and interpolation filters used when a texture is
|
|
* drawn at other scales than 100%.
|
|
*/
|
|
void cogl_material_set_layer_filters (CoglHandle material,
|
|
gint layer_index,
|
|
CoglMaterialFilter min_filter,
|
|
CoglMaterialFilter mag_filter);
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_MATERIAL_H__ */
|