glium/context/capabilities.rs
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use crate::context::ExtensionsList;
use crate::version::Version;
use crate::version::Api;
use std::cmp;
use std::collections::HashMap;
use std::ffi::CStr;
use std::hash::BuildHasherDefault;
use fnv::FnvHasher;
use crate::gl;
use crate::ToGlEnum;
use crate::CapabilitiesSource;
use crate::image_format::TextureFormat;
/// Describes the OpenGL context profile.
#[derive(Debug, Copy, Clone)]
pub enum Profile {
/// The context uses only future-compatible functions and definitions.
Core,
/// The context includes all immediate mode functions and definitions.
Compatibility
}
/// Represents the capabilities of the context.
///
/// Contrary to the state, these values never change.
#[derive(Debug)]
pub struct Capabilities {
/// List of versions of GLSL that are supported by the compiler.
///
/// An empty list means that the backend doesn't have a compiler.
pub supported_glsl_versions: Vec<Version>,
/// Returns a version or release number. Vendor-specific information may follow the version
/// number.
pub version: String,
/// The company responsible for this GL implementation.
pub vendor: String,
/// The name of the renderer. This name is typically specific to a particular
/// configuration of a hardware platform.
pub renderer: String,
/// The OpenGL context profile if available.
///
/// The context profile is available from OpenGL 3.2 onwards. `None` if not supported.
pub profile: Option<Profile>,
/// The context is in debug mode, which may have additional error and performance issue
/// reporting functionality.
pub debug: bool,
/// The context is in "forward-compatible" mode, which means that no deprecated functionality
/// will be supported.
pub forward_compatible: bool,
/// True if out-of-bound access on the GPU side can't result in crashes.
pub robustness: bool,
/// True if it is possible for the OpenGL context to be lost.
pub can_lose_context: bool,
/// What happens when you change the current OpenGL context.
pub release_behavior: ReleaseBehavior,
/// Whether the context supports left and right buffers.
pub stereo: bool,
/// True if the default framebuffer is in sRGB.
pub srgb: bool,
/// Number of bits in the default framebuffer's depth buffer
pub depth_bits: Option<u16>,
/// Number of bits in the default framebuffer's stencil buffer
pub stencil_bits: Option<u16>,
/// Informations about formats when used to create textures.
pub internal_formats_textures: HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>,
/// Informations about formats when used to create renderbuffers.
pub internal_formats_renderbuffers: HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>,
/// Maximum number of textures that can be bound to a program.
///
/// `glActiveTexture` must be between `GL_TEXTURE0` and `GL_TEXTURE0` + this value - 1.
pub max_combined_texture_image_units: gl::types::GLint,
/// Maximum value for `GL_TEXTURE_MAX_ANISOTROPY_EXT​`.
///
/// `None` if the extension is not supported by the hardware.
pub max_texture_max_anisotropy: Option<gl::types::GLfloat>,
/// Maximum size of a texture (i.e. GL_MAX_TEXTURE_SIZE)
pub max_texture_size: gl::types::GLint,
/// Maximum size of a buffer texture. `None` if this is not supported.
pub max_texture_buffer_size: Option<gl::types::GLint>,
/// Maximum width and height of `glViewport`.
pub max_viewport_dims: (gl::types::GLint, gl::types::GLint),
/// Maximum number of elements that can be passed with `glDrawBuffers`.
pub max_draw_buffers: gl::types::GLint,
/// Maximum number of vertices per patch. `None` if tessellation is not supported.
pub max_patch_vertices: Option<gl::types::GLint>,
/// Number of available buffer bind points for `GL_ATOMIC_COUNTER_BUFFER`.
pub max_indexed_atomic_counter_buffer: gl::types::GLint,
/// Number of available buffer bind points for `GL_SHADER_STORAGE_BUFFER`.
pub max_indexed_shader_storage_buffer: gl::types::GLint,
/// Number of available buffer bind points for `GL_TRANSFORM_FEEDBACK_BUFFER`.
pub max_indexed_transform_feedback_buffer: gl::types::GLint,
/// Number of available buffer bind points for `GL_UNIFORM_BUFFER`.
pub max_indexed_uniform_buffer: gl::types::GLint,
/// Number of work groups for compute shaders.
pub max_compute_work_group_count: (gl::types::GLint, gl::types::GLint, gl::types::GLint),
/// Maximum number of color attachment bind points.
pub max_color_attachments: gl::types::GLint,
/// Maximum width of an empty framebuffer. `None` if not supported.
pub max_framebuffer_width: Option<gl::types::GLint>,
/// Maximum height of an empty framebuffer. `None` if not supported.
pub max_framebuffer_height: Option<gl::types::GLint>,
/// Maximum layers of an empty framebuffer. `None` if not supported.
pub max_framebuffer_layers: Option<gl::types::GLint>,
/// Maximum samples of an empty framebuffer. `None` if not supported.
pub max_framebuffer_samples: Option<gl::types::GLint>,
}
/// Information about an internal format.
#[derive(Debug)]
pub struct FormatInfos {
/// Possible values for multisampling. `None` if unknown.
pub multisamples: Option<Vec<gl::types::GLint>>,
}
/// Defines what happens when you change the current context.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum ReleaseBehavior {
/// Nothing is done when using another context.
None,
/// The commands queue of the current context is flushed.
Flush,
}
/// Loads the capabilities.
///
/// *Safety*: the OpenGL context corresponding to `gl` must be current in the thread.
///
/// ## Panic
///
/// Can panic if the version number or extensions list don't match the backend, leading to
/// unloaded functions being called.
///
pub unsafe fn get_capabilities(gl: &gl::Gl, version: &Version, extensions: &ExtensionsList)
-> Capabilities
{
// GL_CONTEXT_FLAGS are only available from GL 3.0 onwards
let (debug, forward_compatible) = if version >= &Version(Api::Gl, 3, 0) {
let mut val = 0;
gl.GetIntegerv(gl::CONTEXT_FLAGS, &mut val);
let val = val as gl::types::GLenum;
((val & gl::CONTEXT_FLAG_DEBUG_BIT) != 0,
(val & gl::CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT) != 0)
} else {
(false, false)
};
// getting the value of `GL_RENDERER`
let renderer = {
let s = gl.GetString(gl::RENDERER);
assert!(!s.is_null());
String::from_utf8(CStr::from_ptr(s as *const _).to_bytes().to_vec()).ok()
.expect("glGetString(GL_RENDERER) returned a non-UTF8 string")
};
Capabilities {
supported_glsl_versions: {
get_supported_glsl(gl, version, extensions)
},
version: {
let s = gl.GetString(gl::VERSION);
assert!(!s.is_null());
String::from_utf8(CStr::from_ptr(s as *const _).to_bytes().to_vec()).ok()
.expect("glGetString(GL_VERSION) returned a non-UTF8 string")
},
vendor: {
let s = gl.GetString(gl::VENDOR);
assert!(!s.is_null());
String::from_utf8(CStr::from_ptr(s as *const _).to_bytes().to_vec()).ok()
.expect("glGetString(GL_VENDOR) returned a non-UTF8 string")
},
profile: {
if version >= &Version(Api::Gl, 3, 2) {
let mut val = 0;
gl.GetIntegerv(gl::CONTEXT_PROFILE_MASK, &mut val);
let val = val as gl::types::GLenum;
if (val & gl::CONTEXT_COMPATIBILITY_PROFILE_BIT) != 0 {
Some(Profile::Compatibility)
} else if (val & gl::CONTEXT_CORE_PROFILE_BIT) != 0 {
Some(Profile::Core)
} else {
None
}
} else {
None
}
},
debug,
forward_compatible,
robustness: if version >= &Version(Api::Gl, 4, 5) || version >= &Version(Api::GlEs, 3, 2) ||
(version >= &Version(Api::Gl, 3, 0) && extensions.gl_arb_robustness)
{
// TODO: there seems to be no way to query `GL_CONTEXT_FLAGS` before OpenGL 3.0, even
// if `GL_ARB_robustness` is there
let mut val = 0;
gl.GetIntegerv(gl::CONTEXT_FLAGS, &mut val);
let val = val as gl::types::GLenum;
(val & gl::CONTEXT_FLAG_ROBUST_ACCESS_BIT) != 0
} else if extensions.gl_khr_robustness || extensions.gl_ext_robustness {
let mut val = 0;
gl.GetBooleanv(gl::CONTEXT_ROBUST_ACCESS, &mut val);
val != 0
} else {
false
},
can_lose_context: if version >= &Version(Api::Gl, 4, 5) || extensions.gl_khr_robustness ||
extensions.gl_arb_robustness || extensions.gl_ext_robustness
{
let mut val = 0;
gl.GetIntegerv(gl::RESET_NOTIFICATION_STRATEGY, &mut val);
match val as gl::types::GLenum {
gl::LOSE_CONTEXT_ON_RESET => true,
gl::NO_RESET_NOTIFICATION => false,
// WORK-AROUND: AMD drivers erroneously return this value, which doesn't even
// correspond to any GLenum in the specs. We work around this bug
// by interpreting it as `false`.
0x31BE => false,
// WORK-AROUND: Adreno 430/506 drivers return NO_ERROR.
gl::NO_ERROR => false,
_ => unreachable!()
}
} else {
false
},
release_behavior: if extensions.gl_khr_context_flush_control {
let mut val = 0;
gl.GetIntegerv(gl::CONTEXT_RELEASE_BEHAVIOR, &mut val);
match val as gl::types::GLenum {
gl::NONE => ReleaseBehavior::None,
gl::CONTEXT_RELEASE_BEHAVIOR_FLUSH => ReleaseBehavior::Flush,
_ => unreachable!()
}
} else {
ReleaseBehavior::Flush
},
stereo: {
if version >= &Version(Api::Gl, 1, 0) {
let mut val: gl::types::GLboolean = 0;
gl.GetBooleanv(gl::STEREO, &mut val);
val != 0
} else {
false
}
},
srgb: {
// `glGetFramebufferAttachmentParameteriv` incorrectly returns GL_INVALID_ENUM on some
// drivers, so we prefer using `glGetIntegerv` if possible.
if version >= &Version(Api::Gl, 3, 0) && !extensions.gl_ext_framebuffer_srgb {
let mut fb = 0;
gl.GetIntegerv(gl::DRAW_FRAMEBUFFER_BINDING, &mut fb);
let attachment = if fb == 0 { gl::FRONT_LEFT } else { gl::COLOR_ATTACHMENT0 };
let mut value = 0;
gl.GetFramebufferAttachmentParameteriv(gl::FRAMEBUFFER, attachment,
gl::FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING,
&mut value);
value as gl::types::GLenum == gl::SRGB
} else if extensions.gl_ext_framebuffer_srgb {
let mut value = 0;
gl.GetBooleanv(gl::FRAMEBUFFER_SRGB_CAPABLE_EXT, &mut value);
value != 0
} else {
false
}
},
depth_bits: {
let mut value = 0;
// `glGetFramebufferAttachmentParameteriv` incorrectly returns GL_INVALID_ENUM on some
// drivers, so we prefer using `glGetIntegerv` if possible.
//
// Also note that `gl_arb_es2_compatibility` may provide `GL_DEPTH_BITS` but os/x
// doesn't even though it provides this extension. I'm not sure whether this is a bug
// with OS/X or just the extension actually not providing it.
if version >= &Version(Api::Gl, 3, 0) && !extensions.gl_arb_compatibility {
let mut fb = 0;
gl.GetIntegerv(gl::DRAW_FRAMEBUFFER_BINDING, &mut fb);
let attachment = if fb == 0 { gl::DEPTH } else { gl::DEPTH_ATTACHMENT };
let mut ty = 0;
gl.GetFramebufferAttachmentParameteriv(gl::FRAMEBUFFER, attachment,
gl::FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
&mut ty);
if ty as gl::types::GLenum == gl::NONE {
value = 0;
} else {
gl.GetFramebufferAttachmentParameteriv(gl::FRAMEBUFFER, attachment,
gl::FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE,
&mut value);
}
} else {
gl.GetIntegerv(gl::DEPTH_BITS, &mut value);
};
match value {
0 => None,
v => Some(v as u16),
}
},
stencil_bits: {
let mut value = 0;
// `glGetFramebufferAttachmentParameteriv` incorrectly returns GL_INVALID_ENUM on some
// drivers, so we prefer using `glGetIntegerv` if possible.
//
// Also note that `gl_arb_es2_compatibility` may provide `GL_STENCIL_BITS` but os/x
// doesn't even though it provides this extension. I'm not sure whether this is a bug
// with OS/X or just the extension actually not providing it.
if version >= &Version(Api::Gl, 3, 0) && !extensions.gl_arb_compatibility {
let mut fb = 0;
gl.GetIntegerv(gl::DRAW_FRAMEBUFFER_BINDING, &mut fb);
let attachment = if fb == 0 { gl::STENCIL } else { gl::STENCIL_ATTACHMENT };
let mut ty = 0;
gl.GetFramebufferAttachmentParameteriv(gl::FRAMEBUFFER, attachment,
gl::FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE,
&mut ty);
if ty as gl::types::GLenum == gl::NONE {
value = 0;
} else {
gl.GetFramebufferAttachmentParameteriv(gl::FRAMEBUFFER, attachment,
gl::FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE,
&mut value);
}
} else {
gl.GetIntegerv(gl::STENCIL_BITS, &mut value);
};
match value {
0 => None,
v => Some(v as u16),
}
},
internal_formats_textures: get_internal_formats(gl, version, extensions, false),
internal_formats_renderbuffers: get_internal_formats(gl, version, extensions, true),
max_combined_texture_image_units: {
let mut val = 2;
gl.GetIntegerv(gl::MAX_COMBINED_TEXTURE_IMAGE_UNITS, &mut val);
// WORK-AROUND (issue #1181)
// Some Radeon drivers crash if you use texture units 32 or more.
if renderer.contains("Radeon") {
val = cmp::min(val, 32);
}
val
},
max_texture_max_anisotropy: if !extensions.gl_ext_texture_filter_anisotropic {
None
} else {
Some({
let mut val = 0.0;
gl.GetFloatv(gl::MAX_TEXTURE_MAX_ANISOTROPY_EXT, &mut val);
val
})
},
max_texture_size: {
let mut val = 0;
gl.GetIntegerv(gl::MAX_TEXTURE_SIZE, &mut val);
val
},
max_texture_buffer_size: {
if version >= &Version(Api::Gl, 3, 0) || extensions.gl_arb_texture_buffer_object ||
extensions.gl_ext_texture_buffer_object || extensions.gl_oes_texture_buffer ||
extensions.gl_ext_texture_buffer
{
Some({
let mut val = 0;
gl.GetIntegerv(gl::MAX_TEXTURE_BUFFER_SIZE, &mut val);
val
})
} else {
None
}
},
max_viewport_dims: {
let mut val: [gl::types::GLint; 2] = [ 0, 0 ];
gl.GetIntegerv(gl::MAX_VIEWPORT_DIMS, val.as_mut_ptr());
(val[0], val[1])
},
max_draw_buffers: {
if version >= &Version(Api::Gl, 2, 0) ||
version >= &Version(Api::GlEs, 3, 0) ||
extensions.gl_ati_draw_buffers || extensions.gl_arb_draw_buffers
{
let mut val = 1;
gl.GetIntegerv(gl::MAX_DRAW_BUFFERS, &mut val);
val
} else {
1
}
},
max_patch_vertices: if version >= &Version(Api::Gl, 4, 0) ||
extensions.gl_arb_tessellation_shader
{
Some({
let mut val = 0;
gl.GetIntegerv(gl::MAX_PATCH_VERTICES, &mut val);
val
})
} else {
None
},
max_indexed_atomic_counter_buffer: if version >= &Version(Api::Gl, 4, 2) { // TODO: ARB_shader_atomic_counters // TODO: GLES
let mut val = 0;
gl.GetIntegerv(gl::MAX_ATOMIC_COUNTER_BUFFER_BINDINGS, &mut val);
val
} else {
0
},
max_indexed_shader_storage_buffer: {
if version >= &Version(Api::Gl, 4, 3) || extensions.gl_arb_shader_storage_buffer_object { // TODO: GLES
let mut val = 0;
gl.GetIntegerv(gl::MAX_SHADER_STORAGE_BUFFER_BINDINGS, &mut val);
val
} else {
0
}
},
max_indexed_transform_feedback_buffer: {
if version >= &Version(Api::Gl, 4, 0) || extensions.gl_arb_transform_feedback3 { // TODO: GLES
let mut val = 0;
gl.GetIntegerv(gl::MAX_TRANSFORM_FEEDBACK_BUFFERS, &mut val);
val
} else if version >= &Version(Api::Gl, 3, 0) || extensions.gl_ext_transform_feedback {
let mut val = 0;
gl.GetIntegerv(gl::MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS_EXT, &mut val);
val
} else {
0
}
},
max_indexed_uniform_buffer: {
if version >= &Version(Api::Gl, 3, 1) || extensions.gl_arb_uniform_buffer_object { // TODO: GLES
let mut val = 0;
gl.GetIntegerv(gl::MAX_UNIFORM_BUFFER_BINDINGS, &mut val);
val
} else {
0
}
},
max_compute_work_group_count: if version >= &Version(Api::Gl, 4, 3) ||
version >= &Version(Api::GlEs, 3, 1) ||
extensions.gl_arb_compute_shader
{
let mut val1 = 0;
let mut val2 = 0;
let mut val3 = 0;
gl.GetIntegeri_v(gl::MAX_COMPUTE_WORK_GROUP_COUNT, 0, &mut val1);
gl.GetIntegeri_v(gl::MAX_COMPUTE_WORK_GROUP_COUNT, 1, &mut val2);
gl.GetIntegeri_v(gl::MAX_COMPUTE_WORK_GROUP_COUNT, 2, &mut val3);
(val1, val2, val3)
} else {
(0, 0, 0)
},
max_color_attachments: {
if version >= &Version(Api::Gl, 3, 0) || version >= &Version(Api::GlEs, 3, 0) ||
extensions.gl_arb_framebuffer_object || extensions.gl_ext_framebuffer_object ||
extensions.gl_nv_fbo_color_attachments
{
let mut val = 4;
gl.GetIntegerv(gl::MAX_COLOR_ATTACHMENTS, &mut val);
val
} else if version >= &Version(Api::GlEs, 2, 0) {
1
} else {
// glium doesn't allow creating contexts that don't support FBOs
unreachable!()
}
},
max_framebuffer_width: {
if version >= &Version(Api::Gl, 4, 3) || version >= &Version(Api::GlEs, 3, 1) ||
extensions.gl_arb_framebuffer_no_attachments
{
let mut val = 0;
gl.GetIntegerv(gl::MAX_FRAMEBUFFER_WIDTH, &mut val);
Some(val)
} else {
None
}
},
max_framebuffer_height: {
if version >= &Version(Api::Gl, 4, 3) || version >= &Version(Api::GlEs, 3, 1) ||
extensions.gl_arb_framebuffer_no_attachments
{
let mut val = 0;
gl.GetIntegerv(gl::MAX_FRAMEBUFFER_HEIGHT, &mut val);
Some(val)
} else {
None
}
},
max_framebuffer_layers: {
if version >= &Version(Api::Gl, 4, 3) || version >= &Version(Api::GlEs, 3, 2) ||
extensions.gl_arb_framebuffer_no_attachments
{
let mut val = 0;
gl.GetIntegerv(gl::MAX_FRAMEBUFFER_LAYERS, &mut val);
Some(val)
} else {
None
}
},
max_framebuffer_samples: {
if version >= &Version(Api::Gl, 4, 3) || version >= &Version(Api::GlEs, 3, 1) ||
extensions.gl_arb_framebuffer_no_attachments
{
let mut val = 0;
gl.GetIntegerv(gl::MAX_FRAMEBUFFER_SAMPLES, &mut val);
Some(val)
} else {
None
}
},
renderer,
}
}
/// Gets the list of GLSL versions supported by the backend.
///
/// *Safety*: the OpenGL context corresponding to `gl` must be current in the thread.
///
/// ## Panic
///
/// Can panic if the version number or extensions list don't match the backend, leading to
/// unloaded functions being called.
///
pub unsafe fn get_supported_glsl(gl: &gl::Gl, version: &Version, extensions: &ExtensionsList)
-> Vec<Version>
{
// checking if the implementation has a shader compiler
// a compiler is optional in OpenGL ES
if version.0 == Api::GlEs {
let mut val = 0;
gl.GetBooleanv(gl::SHADER_COMPILER, &mut val);
if val == 0 {
return vec![];
}
}
// some recent versions have an API to determine the list of supported versions
if version >= &Version(Api::Gl, 4, 3) {
// FIXME: implement this and return the result directly
}
let mut result = Vec::with_capacity(8);
if version >= &Version(Api::GlEs, 2, 0) || version >= &Version(Api::Gl, 4, 1) ||
extensions.gl_arb_es2_compatibility
{
result.push(Version(Api::GlEs, 1, 0));
}
if version >= &Version(Api::GlEs, 3, 0) || version >= &Version(Api::Gl, 4, 3) ||
extensions.gl_arb_es3_compatibility
{
result.push(Version(Api::GlEs, 3, 0));
}
if version >= &Version(Api::GlEs, 3, 1) || version >= &Version(Api::Gl, 4, 5) ||
extensions.gl_arb_es3_1_compatibility
{
result.push(Version(Api::GlEs, 3, 1));
}
if version >= &Version(Api::GlEs, 3, 2) || extensions.gl_arb_es3_2_compatibility {
result.push(Version(Api::GlEs, 3, 2));
}
if version >= &Version(Api::Gl, 2, 0) && version <= &Version(Api::Gl, 3, 0) ||
extensions.gl_arb_compatibility
{
result.push(Version(Api::Gl, 1, 1));
}
if version >= &Version(Api::Gl, 2, 1) && version <= &Version(Api::Gl, 3, 0) ||
extensions.gl_arb_compatibility
{
result.push(Version(Api::Gl, 1, 2));
}
if version == &Version(Api::Gl, 3, 0) || extensions.gl_arb_compatibility {
result.push(Version(Api::Gl, 1, 3));
}
if version >= &Version(Api::Gl, 3, 1) {
result.push(Version(Api::Gl, 1, 4));
}
if version >= &Version(Api::Gl, 3, 2) {
result.push(Version(Api::Gl, 1, 5));
}
for &(major, minor) in &[(3, 3), (4, 0), (4, 1), (4, 2), (4, 3), (4, 4), (4, 5)] {
if version >= &Version(Api::Gl, major, minor) {
result.push(Version(Api::Gl, major, minor));
}
}
result
}
/// Returns all informations about all supported internal formats.
pub fn get_internal_formats(gl: &gl::Gl, version: &Version, extensions: &ExtensionsList,
renderbuffer: bool) -> HashMap<TextureFormat, FormatInfos, BuildHasherDefault<FnvHasher>>
{
// We create a dummy object to implement the `CapabilitiesSource` trait.
let dummy = {
struct DummyCaps<'a>(&'a Version, &'a ExtensionsList);
impl<'a> CapabilitiesSource for DummyCaps<'a> {
fn get_version(&self) -> &Version { self.0 }
fn get_extensions(&self) -> &ExtensionsList { self.1 }
fn get_capabilities(&self) -> &Capabilities { unreachable!() }
}
DummyCaps(version, extensions)
};
TextureFormat::get_formats_list().into_iter().filter_map(|format| {
if renderbuffer {
if !format.is_supported_for_renderbuffers(&dummy) {
return None;
}
} else if !format.is_supported_for_textures(&dummy) {
return None;
}
let infos = get_internal_format(gl, version, extensions, format, renderbuffer);
Some((format, infos))
}).collect()
}
/// Returns informations about a precise internal format.
pub fn get_internal_format(gl: &gl::Gl, version: &Version, extensions: &ExtensionsList,
format: TextureFormat, renderbuffer: bool) -> FormatInfos
{
// We create a dummy object to implement the `CapabilitiesSource` trait.
let dummy = {
struct DummyCaps<'a>(&'a Version, &'a ExtensionsList);
impl<'a> CapabilitiesSource for DummyCaps<'a> {
fn get_version(&self) -> &Version { self.0 }
fn get_extensions(&self) -> &ExtensionsList { self.1 }
fn get_capabilities(&self) -> &Capabilities { unreachable!() }
}
DummyCaps(version, extensions)
};
unsafe {
let target = if renderbuffer { gl::RENDERBUFFER } else { gl::TEXTURE_2D_MULTISAMPLE };
let samples = if format.is_renderable(&dummy) &&
((version >= &Version(Api::GlEs, 3, 0) && renderbuffer) ||
version >= &Version(Api::Gl, 4, 2) ||
extensions.gl_arb_internalformat_query)
{
let mut num = 0;
gl.GetInternalformativ(target, format.to_glenum(), gl::NUM_SAMPLE_COUNTS, 1, &mut num);
if num >= 1 {
let mut formats = Vec::with_capacity(num as usize);
gl.GetInternalformativ(target, format.to_glenum(), gl::SAMPLES, num,
formats.as_mut_ptr());
formats.set_len(num as usize);
Some(formats)
} else {
Some(Vec::new())
}
} else {
None
};
FormatInfos {
multisamples: samples,
}
}
}