template<UnsignedInt dimensions>
Magnum::GL::MultisampleTexture class

Mulitsample texture.

Contents

Template class for 2D mulitsample texture and 2D multisample texture array. Used only from shaders for manual multisample resolve and other operations. See also AbstractTexture documentation for more information.

Usage

As multisample textures have no sampler state, the only thing you need is to set storage:

GL::MultisampleTexture2D texture;
texture.setStorage(16, GL::TextureFormat::RGBA8, {1024, 1024});

In shader, the texture is used via sampler2DMS / sampler2DMSArray, isampler2DMS / isampler2DMSArray or usampler2DMS / usampler2DMSArray. See AbstractShaderProgram documentation for more information about usage in shaders.

Note that multisample textures don't support compressed formats.

Base classes

class AbstractTexture
Base for textures.

Public types

enum (anonymous): UnsignedInt { Dimensions = dimensions }

Public static functions

static auto maxSize() -> VectorTypeFor<dimensions, Int>
Max supported multisample texture size.
static auto wrap(GLuint id, ObjectFlags flags = {}) -> MultisampleTexture<dimensions>
Wrap existing OpenGL multisample texture object.

Constructors, destructors, conversion operators

MultisampleTexture() explicit
Constructor.
MultisampleTexture(NoCreateT) explicit noexcept
Construct without creating the underlying OpenGL object.

Public functions

void bindImage(Int imageUnit, ImageAccess access, ImageFormat format)
Bind texture to given image unit.
void bindImage(Int imageUnit, Int layer, ImageAccess access, ImageFormat format)
Bind texture layer to given image unit.
void bindImageLayered(Int imageUnit, ImageAccess access, ImageFormat format)
Bind layered texture to given image unit.
auto setStorage(Int samples, TextureFormat internalFormat, const VectorTypeFor<dimensions, Int>& size, MultisampleTextureSampleLocations sampleLocations = MultisampleTextureSampleLocations::NotFixed) -> MultisampleTexture<dimensions>&
Set storage.
auto imageSize() -> VectorTypeFor<dimensions, Int>
Texture image size.
void invalidateImage()
Invalidate texture image.
void invalidateSubImage(const VectorTypeFor<dimensions, Int>& offset, const VectorTypeFor<dimensions, Int>& size)
Invalidate texture subimage.

Enum documentation

template<UnsignedInt dimensions>
enum Magnum::GL::MultisampleTexture<dimensions>::(anonymous): UnsignedInt

Enumerators
Dimensions

Texture dimension count

Function documentation

template<UnsignedInt dimensions>
static VectorTypeFor<dimensions, Int> Magnum::GL::MultisampleTexture<dimensions>::maxSize()

Max supported multisample texture size.

The result is cached, repeated queries don't result in repeated OpenGL calls. If neither extension ARB_texture_multisample (part of OpenGL 3.2) nor OpenGL ES 3.1 is available, returns zero vector.

template<UnsignedInt dimensions>
static MultisampleTexture<dimensions> Magnum::GL::MultisampleTexture<dimensions>::wrap(GLuint id, ObjectFlags flags = {})

Wrap existing OpenGL multisample texture object.

Parameters
id OpenGL multisample texture ID
flags Object creation flags

The id is expected to be of an existing OpenGL texture object with target GL_TEXTURE_2D_MULTISAMPLE or GL_TEXTURE_2D_MULTISAMPLE_ARRAY based on dimension count. Unlike texture created using constructor, the OpenGL object is by default not deleted on destruction, use flags for different behavior.

template<UnsignedInt dimensions>
Magnum::GL::MultisampleTexture<dimensions>::MultisampleTexture() explicit

Constructor.

Creates new OpenGL texture object. If ARB_direct_state_access (part of OpenGL 4.5) is not available, the texture is created on first use.

template<UnsignedInt dimensions>
Magnum::GL::MultisampleTexture<dimensions>::MultisampleTexture(NoCreateT) explicit noexcept

Construct without creating the underlying OpenGL object.

The constructed instance is equivalent to moved-from state. Useful in cases where you will overwrite the instance later anyway. Move another object over it to make it useful.

This function can be safely used for constructing (and later destructing) objects even without any OpenGL context being active.

template<UnsignedInt dimensions>
void Magnum::GL::MultisampleTexture<dimensions>::bindImage(Int imageUnit, ImageAccess access, ImageFormat format)

Bind texture to given image unit.

Parameters
imageUnit Image unit
access Image access
format Image format

Available only on 2D multisample textures.

template<UnsignedInt dimensions>
void Magnum::GL::MultisampleTexture<dimensions>::bindImage(Int imageUnit, Int layer, ImageAccess access, ImageFormat format)

Bind texture layer to given image unit.

Parameters
imageUnit Image unit
layer Texture layer
access Image access
format Image format

Available only on 2D multisample texture arrays.

template<UnsignedInt dimensions>
void Magnum::GL::MultisampleTexture<dimensions>::bindImageLayered(Int imageUnit, ImageAccess access, ImageFormat format)

Bind layered texture to given image unit.

Parameters
imageUnit Image unit
access Image access
format Image format

Available only on 2D multisample texture arrays.

template<UnsignedInt dimensions>
MultisampleTexture<dimensions>& Magnum::GL::MultisampleTexture<dimensions>::setStorage(Int samples, TextureFormat internalFormat, const VectorTypeFor<dimensions, Int>& size, MultisampleTextureSampleLocations sampleLocations = MultisampleTextureSampleLocations::NotFixed)

Set storage.

Parameters
samples Sample count
internalFormat Internal format
size Texture size
sampleLocations Whether to use fixed sample locations
Returns Reference to self (for method chaining)

After calling this function the texture is immutable and calling setStorage() again is not allowed.

If neither ARB_direct_state_access (part of OpenGL 4.5) nor EXT_direct_state_access desktop extension is available, the texture is bound before the operation (if not already). If ARB_texture_storage_multisample (part of OpenGL 4.3) is not available, the texture is bound and the feature is emulated using plain ARB_texture_multisample functionality.

template<UnsignedInt dimensions>
VectorTypeFor<dimensions, Int> Magnum::GL::MultisampleTexture<dimensions>::imageSize()

Texture image size.

See Texture::imageSize() for more information.

template<UnsignedInt dimensions>
void Magnum::GL::MultisampleTexture<dimensions>::invalidateImage()

Invalidate texture image.

See Texture::invalidateImage() for more information.

template<UnsignedInt dimensions>
void Magnum::GL::MultisampleTexture<dimensions>::invalidateSubImage(const VectorTypeFor<dimensions, Int>& offset, const VectorTypeFor<dimensions, Int>& size)

Invalidate texture subimage.

See Texture::invalidateSubImage() for more information.