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

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use crate::framebuffer::{Framebuffer, GlImage};
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use gl::types::{GLenum, GLuint};
use librashader::{FilterMode, WrapMode};
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pub fn calc_miplevel(width: u32, height: u32) -> u32 {
let mut size = std::cmp::max(width, height);
let mut levels = 0;
while size != 0 {
levels += 1;
size >>= 1;
}
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levels
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}
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#[derive(Default, Debug, Copy, Clone)]
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pub struct Texture {
pub image: GlImage,
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pub filter: FilterMode,
pub mip_filter: FilterMode,
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pub wrap_mode: WrapMode,
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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
}