mutter/cogl/cogl-attribute.h
Lionel Landwerlin 1b2dd815b4 Registers gtypes for all public objects and structs
This adds much more comprehensive support for gobject-introspection
based bindings by registering all objects as fundamental types that
inherit from CoglObject, and all structs as boxed types.

Co-Author: Robert Bragg <robert@linux.intel.com>

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2014-03-20 18:27:12 +00:00

559 lines
19 KiB
C

/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2010 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*
* Authors:
* Robert Bragg <robert@linux.intel.com>
*/
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_ATTRIBUTE_H__
#define __COGL_ATTRIBUTE_H__
/* We forward declare the CoglAttribute type here to avoid some circular
* dependency issues with the following headers.
*/
typedef struct _CoglAttribute CoglAttribute;
#include <cogl/cogl-attribute-buffer.h>
#include <cogl/cogl-indices.h>
#ifdef COGL_HAS_GTYPE_SUPPORT
#include <glib-object.h>
#endif
COGL_BEGIN_DECLS
/**
* SECTION:cogl-attribute
* @short_description: Functions for declaring and drawing vertex
* attributes
*
* FIXME
*/
#ifdef COGL_HAS_GTYPE_SUPPORT
/**
* cogl_attribute_get_gtype:
*
* Returns: a #GType that can be used with the GLib type system.
*/
GType cogl_attribute_get_gtype (void);
#endif
/**
* cogl_attribute_new: (constructor)
* @attribute_buffer: The #CoglAttributeBuffer containing the actual
* attribute data
* @name: The name of the attribute (used to reference it from GLSL)
* @stride: The number of bytes to jump to get to the next attribute
* value for the next vertex. (Usually
* <literal>sizeof (MyVertex)</literal>)
* @offset: The byte offset from the start of @attribute_buffer for
* the first attribute value. (Usually
* <literal>offsetof (MyVertex, component0)</literal>
* @components: The number of components (e.g. 4 for an rgba color or
* 3 for and (x,y,z) position)
* @type: FIXME
*
* Describes the layout for a list of vertex attribute values (For
* example, a list of texture coordinates or colors).
*
* The @name is used to access the attribute inside a GLSL vertex
* shader and there are some special names you should use if they are
* applicable:
* <itemizedlist>
* <listitem>"cogl_position_in" (used for vertex positions)</listitem>
* <listitem>"cogl_color_in" (used for vertex colors)</listitem>
* <listitem>"cogl_tex_coord0_in", "cogl_tex_coord1", ...
* (used for vertex texture coordinates)</listitem>
* <listitem>"cogl_normal_in" (used for vertex normals)</listitem>
* <listitem>"cogl_point_size_in" (used to set the size of points
* per-vertex. Note this can only be used if
* %COGL_FEATURE_ID_POINT_SIZE_ATTRIBUTE is advertised and
* cogl_pipeline_set_per_vertex_point_size() is called on the pipeline.
* </listitem>
* </itemizedlist>
*
* The attribute values corresponding to different vertices can either
* be tightly packed or interleaved with other attribute values. For
* example it's common to define a structure for a single vertex like:
* |[
* typedef struct
* {
* float x, y, z; /<!-- -->* position attribute *<!-- -->/
* float s, t; /<!-- -->* texture coordinate attribute *<!-- -->/
* } MyVertex;
* ]|
*
* And then create an array of vertex data something like:
* |[
* MyVertex vertices[100] = { .... }
* ]|
*
* In this case, to describe either the position or texture coordinate
* attribute you have to move <literal>sizeof (MyVertex)</literal> bytes to
* move from one vertex to the next. This is called the attribute
* @stride. If you weren't interleving attributes and you instead had
* a packed array of float x, y pairs then the attribute stride would
* be <literal>(2 * sizeof (float))</literal>. So the @stride is the number of
* bytes to move to find the attribute value of the next vertex.
*
* Normally a list of attributes starts at the beginning of an array.
* So for the <literal>MyVertex</literal> example above the @offset is the
* offset inside the <literal>MyVertex</literal> structure to the first
* component of the attribute. For the texture coordinate attribute
* the offset would be <literal>offsetof (MyVertex, s)</literal> or instead of
* using the offsetof macro you could use <literal>sizeof (float) *
* 3</literal>. If you've divided your @array into blocks of non-interleved
* attributes then you will need to calculate the @offset as the number of
* bytes in blocks preceding the attribute you're describing.
*
* An attribute often has more than one component. For example a color
* is often comprised of 4 red, green, blue and alpha @components, and a
* position may be comprised of 2 x and y @components. You should aim
* to keep the number of components to a minimum as more components
* means more data needs to be mapped into the GPU which can be a
* bottlneck when dealing with a large number of vertices.
*
* Finally you need to specify the component data type. Here you
* should aim to use the smallest type that meets your precision
* requirements. Again the larger the type then more data needs to be
* mapped into the GPU which can be a bottlneck when dealing with
* a large number of vertices.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* describing the layout for a list of attribute values
* stored in @array.
*
* Since: 1.4
* Stability: Unstable
*/
/* XXX: look for a precedent to see if the stride/offset args should
* have a different order. */
CoglAttribute *
cogl_attribute_new (CoglAttributeBuffer *attribute_buffer,
const char *name,
size_t stride,
size_t offset,
int components,
CoglAttributeType type);
/**
* cogl_attribute_new_const_1f:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @value: The constant value for the attribute
*
* Creates a new, single component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constant @value is a single precision floating point scalar
* which should have a corresponding declaration in GLSL code like:
*
* [|
* attribute float name;
* |]
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant @value.
*/
CoglAttribute *
cogl_attribute_new_const_1f (CoglContext *context,
const char *name,
float value);
/**
* cogl_attribute_new_const_2f:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @component0: The first component of a 2 component vector
* @component1: The second component of a 2 component vector
*
* Creates a new, 2 component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constants (@component0, @component1) represent a 2 component
* float vector which should have a corresponding declaration in GLSL
* code like:
*
* [|
* attribute vec2 name;
* |]
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant vector.
*/
CoglAttribute *
cogl_attribute_new_const_2f (CoglContext *context,
const char *name,
float component0,
float component1);
/**
* cogl_attribute_new_const_3f:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @component0: The first component of a 3 component vector
* @component1: The second component of a 3 component vector
* @component2: The third component of a 3 component vector
*
* Creates a new, 3 component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constants (@component0, @component1, @component2) represent a 3
* component float vector which should have a corresponding
* declaration in GLSL code like:
*
* [|
* attribute vec3 name;
* |]
*
* unless the built in name "cogl_normal_in" is being used where no
* explicit GLSL declaration need be made.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant vector.
*/
CoglAttribute *
cogl_attribute_new_const_3f (CoglContext *context,
const char *name,
float component0,
float component1,
float component2);
/**
* cogl_attribute_new_const_4f:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @component0: The first component of a 4 component vector
* @component1: The second component of a 4 component vector
* @component2: The third component of a 4 component vector
* @component3: The fourth component of a 4 component vector
*
* Creates a new, 4 component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constants (@component0, @component1, @component2, @constant3)
* represent a 4 component float vector which should have a
* corresponding declaration in GLSL code like:
*
* [|
* attribute vec4 name;
* |]
*
* unless one of the built in names "cogl_color_in",
* "cogl_tex_coord0_in or "cogl_tex_coord1_in" etc is being used where
* no explicit GLSL declaration need be made.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant vector.
*/
CoglAttribute *
cogl_attribute_new_const_4f (CoglContext *context,
const char *name,
float component0,
float component1,
float component2,
float component3);
/**
* cogl_attribute_new_const_2fv:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @value: A pointer to a 2 component float vector
*
* Creates a new, 2 component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constants (value[0], value[1]) represent a 2 component float
* vector which should have a corresponding declaration in GLSL code
* like:
*
* [|
* attribute vec2 name;
* |]
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant vector.
*/
CoglAttribute *
cogl_attribute_new_const_2fv (CoglContext *context,
const char *name,
const float *value);
/**
* cogl_attribute_new_const_3fv:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @value: A pointer to a 3 component float vector
*
* Creates a new, 3 component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constants (value[0], value[1], value[2]) represent a 3
* component float vector which should have a corresponding
* declaration in GLSL code like:
*
* [|
* attribute vec3 name;
* |]
*
* unless the built in name "cogl_normal_in" is being used where no
* explicit GLSL declaration need be made.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant vector.
*/
CoglAttribute *
cogl_attribute_new_const_3fv (CoglContext *context,
const char *name,
const float *value);
/**
* cogl_attribute_new_const_4fv:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @value: A pointer to a 4 component float vector
*
* Creates a new, 4 component, attribute whose value remains
* constant across all the vertices of a primitive without needing to
* duplicate the value for each vertex.
*
* The constants (value[0], value[1], value[2], value[3]) represent a
* 4 component float vector which should have a corresponding
* declaration in GLSL code like:
*
* [|
* attribute vec4 name;
* |]
*
* unless one of the built in names "cogl_color_in",
* "cogl_tex_coord0_in or "cogl_tex_coord1_in" etc is being used where
* no explicit GLSL declaration need be made.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant vector.
*/
CoglAttribute *
cogl_attribute_new_const_4fv (CoglContext *context,
const char *name,
const float *value);
/**
* cogl_attribute_new_const_2x2fv:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @matrix2x2: A pointer to a 2 by 2 matrix
* @transpose: Whether the matrix should be transposed on upload or
* not
*
* Creates a new matrix attribute whose value remains constant
* across all the vertices of a primitive without needing to duplicate
* the value for each vertex.
*
* @matrix2x2 represent a square 2 by 2 matrix specified in
* column-major order (each pair of consecutive numbers represents a
* column) which should have a corresponding declaration in GLSL code
* like:
*
* [|
* attribute mat2 name;
* |]
*
* If @transpose is %TRUE then all matrix components are rotated
* around the diagonal of the matrix such that the first column
* becomes the first row and the second column becomes the second row.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant matrix.
*/
CoglAttribute *
cogl_attribute_new_const_2x2fv (CoglContext *context,
const char *name,
const float *matrix2x2,
CoglBool transpose);
/**
* cogl_attribute_new_const_3x3fv:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @matrix3x3: A pointer to a 3 by 3 matrix
* @transpose: Whether the matrix should be transposed on upload or
* not
*
* Creates a new matrix attribute whose value remains constant
* across all the vertices of a primitive without needing to duplicate
* the value for each vertex.
*
* @matrix3x3 represent a square 3 by 3 matrix specified in
* column-major order (each triple of consecutive numbers represents a
* column) which should have a corresponding declaration in GLSL code
* like:
*
* [|
* attribute mat3 name;
* |]
*
* If @transpose is %TRUE then all matrix components are rotated
* around the diagonal of the matrix such that the first column
* becomes the first row and the second column becomes the second row
* etc.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant matrix.
*/
CoglAttribute *
cogl_attribute_new_const_3x3fv (CoglContext *context,
const char *name,
const float *matrix3x3,
CoglBool transpose);
/**
* cogl_attribute_new_const_4x4fv:
* @context: A #CoglContext
* @name: The name of the attribute (used to reference it from GLSL)
* @matrix4x4: A pointer to a 4 by 4 matrix
* @transpose: Whether the matrix should be transposed on upload or
* not
*
* Creates a new matrix attribute whose value remains constant
* across all the vertices of a primitive without needing to duplicate
* the value for each vertex.
*
* @matrix4x4 represent a square 4 by 4 matrix specified in
* column-major order (each 4-tuple of consecutive numbers represents a
* column) which should have a corresponding declaration in GLSL code
* like:
*
* [|
* attribute mat4 name;
* |]
*
* If @transpose is %TRUE then all matrix components are rotated
* around the diagonal of the matrix such that the first column
* becomes the first row and the second column becomes the second row
* etc.
*
* Return value: (transfer full): A newly allocated #CoglAttribute
* representing the given constant matrix.
*/
CoglAttribute *
cogl_attribute_new_const_4x4fv (CoglContext *context,
const char *name,
const float *matrix4x4,
CoglBool transpose);
/**
* cogl_attribute_set_normalized:
* @attribute: A #CoglAttribute
* @normalized: The new value for the normalized property.
*
* Sets whether fixed point attribute types are mapped to the range
* 0→1. For example when this property is TRUE and a
* %COGL_ATTRIBUTE_TYPE_UNSIGNED_BYTE type is used then the value 255
* will be mapped to 1.0.
*
* The default value of this property depends on the name of the
* attribute. For the builtin properties cogl_color_in and
* cogl_normal_in it will default to TRUE and for all other names it
* will default to FALSE.
*
* Stability: unstable
* Since: 1.10
*/
void
cogl_attribute_set_normalized (CoglAttribute *attribute,
CoglBool normalized);
/**
* cogl_attribute_get_normalized:
* @attribute: A #CoglAttribute
*
* Return value: the value of the normalized property set with
* cogl_attribute_set_normalized().
*
* Stability: unstable
* Since: 1.10
*/
CoglBool
cogl_attribute_get_normalized (CoglAttribute *attribute);
/**
* cogl_attribute_get_buffer:
* @attribute: A #CoglAttribute
*
* Return value: (transfer none): the #CoglAttributeBuffer that was
* set with cogl_attribute_set_buffer() or cogl_attribute_new().
*
* Stability: unstable
* Since: 1.10
*/
CoglAttributeBuffer *
cogl_attribute_get_buffer (CoglAttribute *attribute);
/**
* cogl_attribute_set_buffer:
* @attribute: A #CoglAttribute
* @attribute_buffer: A #CoglAttributeBuffer
*
* Sets a new #CoglAttributeBuffer for the attribute.
*
* Stability: unstable
* Since: 1.10
*/
void
cogl_attribute_set_buffer (CoglAttribute *attribute,
CoglAttributeBuffer *attribute_buffer);
/**
* cogl_is_attribute:
* @object: A #CoglObject
*
* Gets whether the given object references a #CoglAttribute.
*
* Return value: %TRUE if the @object references a #CoglAttribute,
* %FALSE otherwise
*/
CoglBool
cogl_is_attribute (void *object);
COGL_END_DECLS
#endif /* __COGL_ATTRIBUTE_H__ */