CoglPrimitive

typedef struct _CoglPrimitive CoglPrimitive;

cogl_primitive_new ()

CoglPrimitive *     cogl_primitive_new                  (CoglVerticesMode mode,
                                                         int n_vertices,
                                                         ...);

Combines a set of CoglAttributes with a specific draw mode and defines a vertex count so a CoglPrimitive object can be retained and drawn later with no addition information required.

The value passed as n_vertices will simply update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_with_attributes ()

CoglPrimitive *     cogl_primitive_new_with_attributes  (CoglVerticesMode mode,
                                                         int n_vertices,
                                                         CoglAttribute **attributes,
                                                         int n_attributes);

Combines a set of CoglAttributes with a specific draw mode and defines a vertex count so a CoglPrimitive object can be retained and drawn later with no addition information required.

The value passed as n_vertices will simply update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p2 ()

CoglPrimitive *     cogl_primitive_new_p2               (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP2 *data);

data: (array length=n_vertices): (type Cogl.VertexP2): An array of CoglVertexP2 vertices

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position attribute with a CoglAttribute and upload your data.

For example to draw a convex polygon you can do:

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CoglVertexP2 triangle[] =
{
  { 0,   300 },
  { 150, 0,  },
  { 300, 300 }
};
prim = cogl_primitive_new_p2 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                              3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p3 ()

CoglPrimitive *     cogl_primitive_new_p3               (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP3 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position attribute with a CoglAttribute and upload your data.

For example to draw a convex polygon you can do:

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CoglVertexP3 triangle[] =
{
  { 0,   300, 0 },
  { 150, 0,   0 },
  { 300, 300, 0 }
};
prim = cogl_primitive_new_p3 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                              3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p2c4 ()

CoglPrimitive *     cogl_primitive_new_p2c4             (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP2C4 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position and color attributes with CoglAttributes and upload your data.

For example to draw a convex polygon with a linear gradient you can do:

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CoglVertexP2C4 triangle[] =
{
  { 0,   300,  0xff, 0x00, 0x00, 0xff },
  { 150, 0,    0x00, 0xff, 0x00, 0xff },
  { 300, 300,  0xff, 0x00, 0x00, 0xff }
};
prim = cogl_primitive_new_p2c4 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                                3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p3c4 ()

CoglPrimitive *     cogl_primitive_new_p3c4             (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP3C4 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position and color attributes with CoglAttributes and upload your data.

For example to draw a convex polygon with a linear gradient you can do:

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CoglVertexP3C4 triangle[] =
{
  { 0,   300, 0,  0xff, 0x00, 0x00, 0xff },
  { 150, 0,   0,  0x00, 0xff, 0x00, 0xff },
  { 300, 300, 0,  0xff, 0x00, 0x00, 0xff }
};
prim = cogl_primitive_new_p3c4 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                                3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p2t2 ()

CoglPrimitive *     cogl_primitive_new_p2t2             (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP2T2 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position and texture coordinate attributes with CoglAttributes and upload your data.

For example to draw a convex polygon with texture mapping you can do:

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CoglVertexP2T2 triangle[] =
{
  { 0,   300,  0.0, 1.0},
  { 150, 0,    0.5, 0.0},
  { 300, 300,  1.0, 1.0}
};
prim = cogl_primitive_new_p2t2 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                                3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p3t2 ()

CoglPrimitive *     cogl_primitive_new_p3t2             (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP3T2 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position and texture coordinate attributes with CoglAttributes and upload your data.

For example to draw a convex polygon with texture mapping you can do:

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CoglVertexP3T2 triangle[] =
{
  { 0,   300, 0,  0.0, 1.0},
  { 150, 0,   0,  0.5, 0.0},
  { 300, 300, 0,  1.0, 1.0}
};
prim = cogl_primitive_new_p3t2 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                                3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p2t2c4 ()

CoglPrimitive *     cogl_primitive_new_p2t2c4           (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP2T2C4 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position, texture coordinate and color attributes with CoglAttributes and upload your data.

For example to draw a convex polygon with texture mapping and a linear gradient you can do:

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CoglVertexP2T2C4 triangle[] =
{
  { 0,   300,  0.0, 1.0,  0xff, 0x00, 0x00, 0xff},
  { 150, 0,    0.5, 0.0,  0x00, 0xff, 0x00, 0xff},
  { 300, 300,  1.0, 1.0,  0xff, 0x00, 0x00, 0xff}
};
prim = cogl_primitive_new_p2t2c4 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                                  3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_primitive_new_p3t2c4 ()

CoglPrimitive *     cogl_primitive_new_p3t2c4           (CoglContext *context,
                                                         CoglVerticesMode mode,
                                                         int n_vertices,
                                                         const CoglVertexP3T2C4 *data);

Provides a convenient way to describe a primitive, such as a single triangle strip or a triangle fan, that will internally allocate the necessary CoglAttributeBuffer storage, describe the position, texture coordinate and color attributes with CoglAttributes and upload your data.

For example to draw a convex polygon with texture mapping and a linear gradient you can do:

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CoglVertexP3T2C4 triangle[] =
{
  { 0,   300, 0,  0.0, 1.0,  0xff, 0x00, 0x00, 0xff},
  { 150, 0,   0,  0.5, 0.0,  0x00, 0xff, 0x00, 0xff},
  { 300, 300, 0,  1.0, 1.0,  0xff, 0x00, 0x00, 0xff}
};
prim = cogl_primitive_new_p3t2c4 (COGL_VERTICES_MODE_TRIANGLE_FAN,
                                  3, triangle);
cogl_primitive_draw (prim);

The value passed as n_vertices is initially used to determine how much can be read from data but it will also be used to update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to read when drawing.

Since 1.6

Stability Level: Unstable

cogl_is_primitive ()

CoglBool            cogl_is_primitive                   (void *object);

Gets whether the given object references a CoglPrimitive.

Since 1.6

Stability Level: Unstable

cogl_primitive_get_first_vertex ()

int                 cogl_primitive_get_first_vertex     (CoglPrimitive *primitive);

cogl_primitive_set_first_vertex ()

void                cogl_primitive_set_first_vertex     (CoglPrimitive *primitive,
                                                         int first_vertex);

cogl_primitive_get_n_vertices ()

int                 cogl_primitive_get_n_vertices       (CoglPrimitive *primitive);

Queries the number of vertices to read when drawing the given primitive. Usually this value is implicitly set when associating vertex data or indices with a CoglPrimitive.

If cogl_primitive_set_indices() has been used to associate a sequence of CoglIndices with the given primitive then the number of vertices to read can also be phrased as the number of indices to read.

Since 1.8

Stability Level: Unstable

cogl_primitive_set_n_vertices ()

void                cogl_primitive_set_n_vertices       (CoglPrimitive *primitive,
                                                         int n_vertices);

Specifies how many vertices should be read when drawing the given primitive.

Usually this value is set implicitly when associating vertex data or indices with a CoglPrimitive.

Since 1.8

Stability Level: Unstable

cogl_primitive_get_mode ()

CoglVerticesMode    cogl_primitive_get_mode             (CoglPrimitive *primitive);

cogl_primitive_set_mode ()

void                cogl_primitive_set_mode             (CoglPrimitive *primitive,
                                                         CoglVerticesMode mode);

cogl_primitive_set_attributes ()

void                cogl_primitive_set_attributes       (CoglPrimitive *primitive,
                                                         CoglAttribute **attributes,
                                                         int n_attributes);

Replaces all the attributes of the given CoglPrimitive object.

Since 1.6

Stability Level: Unstable

cogl_primitive_get_indices ()

CoglIndices *       cogl_primitive_get_indices          (CoglPrimitive *primitive);

Since 1.10

Stability Level: Unstable

cogl_primitive_set_indices ()

void                cogl_primitive_set_indices          (CoglPrimitive *primitive,
                                                         CoglIndices *indices,
                                                         int n_indices);

Associates a sequence of CoglIndices with the given primitive.

CoglIndices provide a way to virtualize your real vertex data by providing a sequence of indices that index into your real vertex data. The GPU will walk though the index values to indirectly lookup the data for each vertex instead of sequentially walking through the data directly. This lets you save memory by indexing shared data multiple times instead of duplicating the data.

The value passed as n_indices will simply update the CoglPrimitive n_vertices property as if cogl_primitive_set_n_vertices() were called. This property defines the number of vertices to draw or, put another way, how many indices should be read from indices when drawing.

Since 1.10

Stability Level: Unstable

cogl_primitive_copy ()

CoglPrimitive *     cogl_primitive_copy                 (CoglPrimitive *primitive);

Makes a copy of an existing CoglPrimitive. Note that the primitive is a shallow copy which means it will use the same attributes and attribute buffers as the original primitive.

Since 1.10

Stability Level: Unstable

CoglPrimitiveAttributeCallback ()

CoglBool            (*CoglPrimitiveAttributeCallback)   (CoglPrimitive *primitive,
                                                         CoglAttribute *attribute,
                                                         void *user_data);

The callback prototype used with cogl_primitive_foreach_attribute() for iterating all the attributes of a CoglPrimitive.

The function should return TRUE to continue iteration or FALSE to stop.

Since 1.10

Stability Level: Unstable

cogl_primitive_foreach_attribute ()

void                cogl_primitive_foreach_attribute    (CoglPrimitive *primitive,
                                                         CoglPrimitiveAttributeCallback callback,
                                                         void *user_data);

Iterates all the attributes of the given CoglPrimitive.

Since 1.10

Stability Level: Unstable

cogl_primitive_draw ()

void                cogl_primitive_draw                 (CoglPrimitive *primitive,
                                                         CoglFramebuffer *framebuffer,
                                                         CoglPipeline *pipeline);

Draws the given primitive geometry to the specified destination framebuffer using the graphics processing state described by pipeline.

This drawing api doesn't support high-level meta texture types such as CoglTexture2DSliced so it is the user's responsibility to ensure that only low-level textures that can be directly sampled by a GPU such as CoglTexture2D, CoglTextureRectangle or CoglTexture3D are associated with layers of the given pipeline.

Since 1.16

Stability Level: Unstable