Struct Capabilities 

pub struct Capabilities {

    pub supported_glsl_versions: Vec<Version>,
    pub version: String,
    pub vendor: String,
    pub renderer: String,
    pub profile: Option<Profile>,
    pub debug: bool,
    pub forward_compatible: bool,
    pub robustness: bool,
    pub can_lose_context: bool,
    pub release_behavior: ReleaseBehavior,
    pub stereo: bool,
    pub srgb: bool,
    pub depth_bits: Option<u16>,
    pub stencil_bits: Option<u16>,
    pub internal_formats_textures: HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>,
    pub internal_formats_renderbuffers: HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>,
    pub max_combined_texture_image_units: c_int,
    pub max_texture_max_anisotropy: Option<c_float>,
    pub max_texture_size: c_int,
    pub max_texture_buffer_size: Option<c_int>,
    pub max_viewport_dims: (c_int, c_int),
    pub max_draw_buffers: c_int,
    pub max_patch_vertices: Option<c_int>,
    pub max_indexed_atomic_counter_buffer: c_int,
    pub max_indexed_shader_storage_buffer: c_int,
    pub max_indexed_transform_feedback_buffer: c_int,
    pub max_indexed_uniform_buffer: c_int,
    pub max_compute_work_group_count: (c_int, c_int, c_int),
    pub max_color_attachments: c_int,
    pub max_framebuffer_width: Option<c_int>,
    pub max_framebuffer_height: Option<c_int>,
    pub max_framebuffer_layers: Option<c_int>,
    pub max_framebuffer_samples: Option<c_int>,
}

Represents the capabilities of the context.

Contrary to the state, these values never change.

Fields

supported_glsl_versions: Vec<Version>

List of versions of GLSL that are supported by the compiler.

An empty list means that the backend doesn’t have a compiler.

version: String

Returns a version or release number. Vendor-specific information may follow the version number.

vendor: String

The company responsible for this GL implementation.

renderer: String

The name of the renderer. This name is typically specific to a particular configuration of a hardware platform.

profile: Option<Profile>

The OpenGL context profile if available.

The context profile is available from OpenGL 3.2 onwards. None if not supported.

debug: bool

The context is in debug mode, which may have additional error and performance issue reporting functionality.

forward_compatible: bool

The context is in “forward-compatible” mode, which means that no deprecated functionality will be supported.

robustness: bool

True if out-of-bound access on the GPU side can’t result in crashes.

can_lose_context: bool

True if it is possible for the OpenGL context to be lost.

release_behavior: ReleaseBehavior

What happens when you change the current OpenGL context.

stereo: bool

Whether the context supports left and right buffers.

srgb: bool

True if the default framebuffer is in sRGB.

depth_bits: Option<u16>

Number of bits in the default framebuffer’s depth buffer

stencil_bits: Option<u16>

Number of bits in the default framebuffer’s stencil buffer

internal_formats_textures: HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>

Informations about formats when used to create textures.

internal_formats_renderbuffers: HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>

Informations about formats when used to create renderbuffers.

max_combined_texture_image_units: c_int

Maximum number of textures that can be bound to a program.

glActiveTexture must be between GL_TEXTURE0 and GL_TEXTURE0 + this value - 1.

max_texture_max_anisotropy: Option<c_float>

Maximum value for GL_TEXTURE_MAX_ANISOTROPY_EXT​.

None if the extension is not supported by the hardware.

max_texture_size: c_int

Maximum size of a texture (i.e. GL_MAX_TEXTURE_SIZE)

max_texture_buffer_size: Option<c_int>

Maximum size of a buffer texture. None if this is not supported.

max_viewport_dims: (c_int, c_int)

Maximum width and height of glViewport.

max_draw_buffers: c_int

Maximum number of elements that can be passed with glDrawBuffers.

max_patch_vertices: Option<c_int>

Maximum number of vertices per patch. None if tessellation is not supported.

max_indexed_atomic_counter_buffer: c_int

Number of available buffer bind points for GL_ATOMIC_COUNTER_BUFFER.

max_indexed_shader_storage_buffer: c_int

Number of available buffer bind points for GL_SHADER_STORAGE_BUFFER.

max_indexed_transform_feedback_buffer: c_int

Number of available buffer bind points for GL_TRANSFORM_FEEDBACK_BUFFER.

max_indexed_uniform_buffer: c_int

Number of available buffer bind points for GL_UNIFORM_BUFFER.

max_compute_work_group_count: (c_int, c_int, c_int)

Number of work groups for compute shaders.

max_color_attachments: c_int

Maximum number of color attachment bind points.

max_framebuffer_width: Option<c_int>

Maximum width of an empty framebuffer. None if not supported.

max_framebuffer_height: Option<c_int>

Maximum height of an empty framebuffer. None if not supported.

max_framebuffer_layers: Option<c_int>

Maximum layers of an empty framebuffer. None if not supported.

max_framebuffer_samples: Option<c_int>

Maximum samples of an empty framebuffer. None if not supported.

Trait Implementations

impl Debug for Capabilities

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.