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use std::ffi::CStr;
use std::ptr::null_mut;
use crate::matrix::Matrix;
use crate::opengl::currently_bound::CurrentlyBound;
use crate::shader::Kind;
use crate::vector::Vec3;
#[derive(Debug)]
pub struct Shader
{
shader: gl::types::GLuint,
}
impl Shader
{
pub fn new(kind: Kind) -> Self
{
let shader = unsafe { gl::CreateShader(kind.into_gl()) };
Self { shader }
}
pub fn set_source(&self, source: &str) -> Result<(), Error>
{
if !source.is_ascii() {
return Err(Error::SourceNotAscii);
}
unsafe {
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
gl::ShaderSource(
self.shader,
1,
&source.as_ptr().cast(),
&(source.len() as gl::types::GLint),
);
}
Ok(())
}
pub fn compile(&self) -> Result<(), Error>
{
unsafe {
gl::CompileShader(self.shader);
}
let mut compile_success = gl::types::GLint::default();
unsafe {
gl::GetShaderiv(self.shader, gl::COMPILE_STATUS, &mut compile_success);
}
if compile_success == 0 {
let info_log = self.get_info_log();
return Err(Error::CompileFailed(info_log));
}
Ok(())
}
fn get_info_log(&self) -> String
{
let mut buf = vec![gl::types::GLchar::default(); 512];
unsafe {
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
gl::GetShaderInfoLog(
self.shader,
buf.len() as gl::types::GLsizei,
null_mut(),
buf.as_mut_ptr(),
);
}
let info_log = unsafe { CStr::from_ptr(buf.as_ptr()) };
unsafe { String::from_utf8_unchecked(info_log.to_bytes().to_vec()) }
}
}
impl Drop for Shader
{
fn drop(&mut self)
{
unsafe {
gl::DeleteShader(self.shader);
}
}
}
impl Kind
{
fn into_gl(self) -> gl::types::GLenum
{
match self {
Self::Vertex => gl::VERTEX_SHADER,
Self::Fragment => gl::FRAGMENT_SHADER,
}
}
}
/// Shader program
#[derive(Debug, PartialEq, Eq, Hash)]
pub struct Program
{
program: gl::types::GLuint,
}
impl Program
{
pub fn new() -> Self
{
let program = unsafe { gl::CreateProgram() };
Self { program }
}
pub fn attach(&self, shader: &Shader)
{
unsafe {
gl::AttachShader(self.program, shader.shader);
}
}
pub fn link(&self) -> Result<(), Error>
{
unsafe {
gl::LinkProgram(self.program);
}
let mut link_success = gl::types::GLint::default();
unsafe {
gl::GetProgramiv(self.program, gl::LINK_STATUS, &mut link_success);
}
if link_success == 0 {
let info_log = self.get_info_log();
return Err(Error::CompileFailed(info_log));
}
Ok(())
}
pub fn activate<Ret>(&self, cb: impl FnOnce(CurrentlyBound<'_, Self>) -> Ret) -> Ret
{
unsafe {
gl::UseProgram(self.program);
}
// SAFETY: The shader program object is bound above
let currently_bound = unsafe { CurrentlyBound::new() };
cb(currently_bound)
}
pub fn set_uniform_matrix_4fv(
&self,
_: &CurrentlyBound<Self>,
name: &CStr,
matrix: &Matrix<f32, 4, 4>,
)
{
let uniform_location =
unsafe { gl::GetUniformLocation(self.program, name.as_ptr().cast()) };
unsafe {
gl::UniformMatrix4fv(uniform_location, 1, gl::FALSE, matrix.as_ptr());
}
}
pub fn set_uniform_vec_3fv(
&self,
_: &CurrentlyBound<Self>,
name: &CStr,
vec: &Vec3<f32>,
)
{
let uniform_location =
unsafe { gl::GetUniformLocation(self.program, name.as_ptr().cast()) };
unsafe {
gl::Uniform3fv(uniform_location, 1, vec.as_ptr());
}
}
pub fn set_uniform_1fv(&self, _: &CurrentlyBound<Self>, name: &CStr, num: f32)
{
let uniform_location =
unsafe { gl::GetUniformLocation(self.program, name.as_ptr().cast()) };
unsafe {
gl::Uniform1fv(uniform_location, 1, &num);
}
}
pub fn set_uniform_1i(&self, _: &CurrentlyBound<Self>, name: &CStr, num: i32)
{
let uniform_location =
unsafe { gl::GetUniformLocation(self.program, name.as_ptr().cast()) };
unsafe {
gl::Uniform1i(uniform_location, num);
}
}
fn get_info_log(&self) -> String
{
let mut buf = vec![gl::types::GLchar::default(); 512];
unsafe {
#[allow(clippy::cast_possible_wrap, clippy::cast_possible_truncation)]
gl::GetProgramInfoLog(
self.program,
buf.len() as gl::types::GLsizei,
null_mut(),
buf.as_mut_ptr(),
);
}
let info_log = unsafe { CStr::from_ptr(buf.as_ptr()) };
unsafe { String::from_utf8_unchecked(info_log.to_bytes().to_vec()) }
}
}
impl Drop for Program
{
fn drop(&mut self)
{
unsafe {
gl::DeleteProgram(self.program);
}
}
}
/// Shader error.
#[derive(Debug, thiserror::Error)]
pub enum Error
{
#[error("All characters in source are not within the ASCII range")]
SourceNotAscii,
#[error("Failed to compile: {0}")]
CompileFailed(String),
}
|
