librashader/librashader-runtime-gl/src/util.rs

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3.1 KiB
Rust
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use gl::types::{GLenum, GLint, GLuint};
use librashader_common::Size;
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use librashader_reflect::back::cross::GlVersion;
use librashader_reflect::reflect::semantics::BindingStage;
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use librashader_reflect::reflect::uniforms::{BindUniform, UniformStorage, UniformScalar};
use crate::binding::UniformLocation;
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pub fn calc_miplevel(size: Size<u32>) -> u32 {
let mut size = std::cmp::max(size.width, size.height);
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let mut levels = 0;
while size != 0 {
levels += 1;
size >>= 1;
}
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levels
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}
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pub trait RingBuffer<T> {
fn current(&self) -> &T;
fn current_mut(&mut self) -> &mut T;
fn next(&mut self);
}
impl<T, const SIZE: usize> RingBuffer<T> for InlineRingBuffer<T, SIZE> {
fn current(&self) -> &T {
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&self.items[self.index]
}
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fn current_mut(&mut self) -> &mut T {
&mut self.items[self.index]
}
fn next(&mut self) {
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self.index += 1;
if self.index >= SIZE {
self.index = 0
}
}
}
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pub struct InlineRingBuffer<T, const SIZE: usize> {
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items: [T; SIZE],
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index: usize,
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}
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impl<T, const SIZE: usize> InlineRingBuffer<T, SIZE>
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where
T: Copy,
T: Default,
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{
pub fn new() -> Self {
Self {
items: [T::default(); SIZE],
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index: 0,
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}
}
pub fn items(&self) -> &[T; SIZE] {
&self.items
}
pub fn items_mut(&mut self) -> &mut [T; SIZE] {
&mut self.items
}
}
pub unsafe fn gl_compile_shader(stage: GLenum, source: &str) -> GLuint {
let shader = gl::CreateShader(stage);
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gl::ShaderSource(
shader,
1,
&source.as_bytes().as_ptr().cast(),
std::ptr::null(),
);
gl::CompileShader(shader);
let mut compile_status = 0;
gl::GetShaderiv(shader, gl::COMPILE_STATUS, &mut compile_status);
if compile_status == 0 {
panic!("failed to compile")
}
shader
}
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pub fn gl_get_version() -> GlVersion {
let mut maj_ver = 0;
let mut min_ver = 0;
unsafe {
gl::GetIntegerv(gl::MAJOR_VERSION, &mut maj_ver);
gl::GetIntegerv(gl::MINOR_VERSION, &mut min_ver);
}
match maj_ver {
3 => match min_ver {
3 => GlVersion::V3_30,
2 => GlVersion::V1_50,
1 => GlVersion::V1_40,
0 => GlVersion::V1_30,
_ => GlVersion::V1_50,
}
4 => match min_ver {
6 => GlVersion::V4_60,
5 => GlVersion::V4_50,
4 => GlVersion::V4_40,
3 => GlVersion::V4_30,
2 => GlVersion::V4_20,
1 => GlVersion::V4_10,
0 => GlVersion::V4_00,
_ => GlVersion::V1_50
}
_ => GlVersion::V1_50
}
}
pub fn gl_u16_to_version(version: u16) -> GlVersion {
match version {
300 => GlVersion::V1_30,
310 => GlVersion::V1_40,
320 => GlVersion::V1_50,
330 => GlVersion::V3_30,
400 => GlVersion::V4_00,
410 => GlVersion::V4_10,
420 => GlVersion::V4_20,
430 => GlVersion::V4_30,
440 => GlVersion::V4_40,
450 => GlVersion::V4_50,
460 => GlVersion::V4_60,
_ => GlVersion::V1_50
}
}