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use gleam::gl;
#[cfg(feature = "serde")]
use serde::{Deserialize, Deserializer, Serialize, Serializer};
#[derive(Debug, Clone)]
pub struct GLLimits {
pub max_vertex_attribs: u32,
pub max_tex_size: u32,
pub max_cube_map_tex_size: u32,
pub max_combined_texture_image_units: u32,
pub max_fragment_uniform_vectors: u32,
pub max_renderbuffer_size: u32,
pub max_texture_image_units: u32,
pub max_varying_vectors: u32,
pub max_vertex_texture_image_units: u32,
pub max_vertex_uniform_vectors: u32
}
#[cfg(feature = "serde")]
impl<'de> Deserialize<'de> for GLLimits {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where D: Deserializer<'de>
{
let values = try!(<[_; 10]>::deserialize(deserializer));
Ok(GLLimits {
max_vertex_attribs: values[0],
max_tex_size: values[1],
max_cube_map_tex_size: values[2],
max_combined_texture_image_units: values[3],
max_fragment_uniform_vectors: values[4],
max_renderbuffer_size: values[5],
max_texture_image_units: values[6],
max_varying_vectors: values[7],
max_vertex_texture_image_units: values[8],
max_vertex_uniform_vectors: values[9],
})
}
}
#[cfg(feature = "serde")]
impl Serialize for GLLimits {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where S: Serializer
{
[self.max_vertex_attribs, self.max_tex_size, self.max_cube_map_tex_size,
self.max_combined_texture_image_units, self.max_fragment_uniform_vectors,
self.max_renderbuffer_size, self.max_texture_image_units, self.max_varying_vectors,
self.max_vertex_texture_image_units, self.max_vertex_uniform_vectors]
.serialize(serializer)
}
}
macro_rules! gl_integer {
($gl:ident, $pname:ident) => {
{
debug_assert!($gl.get_error() == gl::NO_ERROR);
let mut val = [0];
unsafe {
$gl.get_integer_v(gl::$pname, &mut val);
}
assert_eq!($gl.get_error(), gl::NO_ERROR, "Error retrieving {}", stringify!($pname));
val[0] as u32
}
}
}
fn gl_fallible_integer(gl_: &gl::Gl, pname: gl::GLenum) -> Result<u32, ()> {
let mut val = [0];
unsafe {
gl_.get_integer_v(pname, &mut val);
}
let err = gl_.get_error();
if err == gl::INVALID_ENUM {
return Err(());
}
assert_eq!(err, gl::NO_ERROR);
Ok(val[0] as u32)
}
impl GLLimits {
pub fn detect(gl_: &gl::Gl) -> GLLimits {
let max_vertex_attribs = gl_integer!(gl_, MAX_VERTEX_ATTRIBS);
let max_tex_size = gl_integer!(gl_, MAX_TEXTURE_SIZE);
let max_cube_map_tex_size = gl_integer!(gl_, MAX_CUBE_MAP_TEXTURE_SIZE);
let max_combined_texture_image_units = gl_integer!(gl_, MAX_COMBINED_TEXTURE_IMAGE_UNITS);
let max_renderbuffer_size = gl_integer!(gl_, MAX_RENDERBUFFER_SIZE);
let max_texture_image_units = gl_integer!(gl_, MAX_TEXTURE_IMAGE_UNITS);
let max_vertex_texture_image_units = gl_integer!(gl_, MAX_VERTEX_TEXTURE_IMAGE_UNITS);
let (max_fragment_uniform_vectors,
max_varying_vectors,
max_vertex_uniform_vectors) = match gl_fallible_integer(gl_, gl::MAX_FRAGMENT_UNIFORM_VECTORS) {
Ok(limit) => {
(limit,
gl_integer!(gl_, MAX_VARYING_VECTORS),
gl_integer!(gl_, MAX_VERTEX_UNIFORM_VECTORS))
}
Err(()) => {
let max_fragment_uniform_components =
gl_integer!(gl_, MAX_FRAGMENT_UNIFORM_COMPONENTS);
let max_vertex_uniform_components =
gl_integer!(gl_, MAX_VERTEX_UNIFORM_COMPONENTS);
let max_vertex_output_components =
gl_fallible_integer(gl_, gl::MAX_VERTEX_OUTPUT_COMPONENTS).unwrap_or(0);
let max_fragment_input_components =
gl_fallible_integer(gl_, gl::MAX_FRAGMENT_INPUT_COMPONENTS).unwrap_or(0);
let max_varying_components =
max_vertex_output_components.min(max_fragment_input_components).max(16);
(max_fragment_uniform_components / 4,
max_varying_components / 4,
max_vertex_uniform_components / 4)
}
};
GLLimits {
max_vertex_attribs,
max_tex_size,
max_cube_map_tex_size,
max_combined_texture_image_units,
max_fragment_uniform_vectors,
max_renderbuffer_size,
max_texture_image_units,
max_varying_vectors,
max_vertex_texture_image_units,
max_vertex_uniform_vectors,
}
}
}