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|
use std::collections::HashMap;
use glow::HasContext;
use crate::{context, mesh};
const COMMON_VERT: &'static str = include_str!("assets/shaders/common/vert.glsl");
const COMMON_FRAG: &'static str = include_str!("assets/shaders/common/frag.glsl");
#[derive(Clone)]
pub struct Shader {
pub program: glow::Program,
pub uniforms: std::rc::Rc<HashMap<String, glow::UniformLocation>>
}
impl Shader {
pub fn new_nolib(ctx: &context::Context, vsrc: &str, fsrc: &str) -> Self {
unsafe {
let program = ctx.gl.create_program()
.expect("cannot create shader program");
let vert = ctx.gl.create_shader(glow::VERTEX_SHADER)
.expect("cannot create shader");
ctx.gl.shader_source(vert, &vsrc);
ctx.gl.compile_shader(vert);
if !ctx.gl.get_shader_compile_status(vert) {
panic!(
"failed to compile vertex shader:\n{}",
ctx.gl.get_shader_info_log(vert)
);
}
ctx.gl.attach_shader(program, vert);
let frag = ctx.gl.create_shader(glow::FRAGMENT_SHADER)
.expect("cannot create shader");
ctx.gl.shader_source(frag, &fsrc);
ctx.gl.compile_shader(frag);
if !ctx.gl.get_shader_compile_status(frag) {
panic!(
"failed to compile fragment shader:\n{}",
ctx.gl.get_shader_info_log(frag)
);
}
ctx.gl.attach_shader(program, frag);
ctx.gl.bind_attrib_location(program, mesh::ATTRIB_VERTEX, "vertex");
ctx.gl.bind_attrib_location(program, mesh::ATTRIB_NORMAL, "normal");
ctx.gl.bind_attrib_location(program, mesh::ATTRIB_TEXCOORD, "texcoord");
ctx.gl.link_program(program);
if !ctx.gl.get_program_link_status(program) {
panic!(
"failed to link shader program:\n{}",
ctx.gl.get_program_info_log(program),
);
}
ctx.gl.detach_shader(program, vert);
ctx.gl.delete_shader(vert);
ctx.gl.detach_shader(program, frag);
ctx.gl.delete_shader(frag);
let mut uniforms = HashMap::new();
for index in 0..ctx.gl.get_active_uniforms(program) {
if let Some(active) = ctx.gl.get_active_uniform(program, index) {
let loc = ctx.gl.get_uniform_location(program, &active.name)
.expect(&format!("failed to get location for uniform: {}", active.name));
uniforms.insert(active.name, loc);
}
}
Self {
program,
uniforms: std::rc::Rc::new(uniforms),
}
}
}
pub fn new(ctx: &context::Context, vsrcstr: &str, fsrcstr: &str) -> Self {
let vsrc = format!("{}\n{}\n", COMMON_VERT, vsrcstr);
let fsrc = format!("{}\n{}\n", COMMON_FRAG, fsrcstr);
Self::new_nolib(ctx, &vsrc, &fsrc)
}
pub fn set_i32(&self, ctx: &context::Context, name: &str, val: i32) {
if let Some(loc) = self.uniforms.get(name) {
unsafe { ctx.gl.uniform_1_i32(Some(loc), val) }
}
}
pub fn set_i32_array(&self, ctx: &context::Context, name: &str, val: &[i32]) {
if let Some(loc) = self.uniforms.get(name) {
unsafe {
ctx.gl.uniform_1_i32_slice(Some(loc), val)
}
}
}
pub fn set_f32(&self, ctx: &context::Context, name: &str, val: f32) {
if let Some(loc) = self.uniforms.get(name) {
unsafe { ctx.gl.uniform_1_f32(Some(loc), val) }
}
}
pub fn set_vec3(&self, ctx: &context::Context, name: &str, val: &glam::Vec3) {
if let Some(loc) = self.uniforms.get(name) {
unsafe {
ctx.gl.uniform_3_f32(
Some(loc),
val.x,
val.y,
val.z,
);
}
}
}
pub fn set_vec4(&self, ctx: &context::Context, name: &str, val: &glam::Vec4) {
if let Some(loc) = self.uniforms.get(name) {
unsafe {
ctx.gl.uniform_4_f32(
Some(loc),
val.x,
val.y,
val.z,
val.w,
);
}
}
}
pub fn set_mat4(&self, ctx: &context::Context, name: &str, val: &glam::Mat4) {
if let Some(loc) = self.uniforms.get(name) {
unsafe {
ctx.gl.uniform_matrix_4_f32_slice(
Some(loc),
false,
&val.to_cols_array(),
);
}
}
}
pub fn set_position_3d(&self, ctx: &context::Context, position: &glam::Mat4) {
self.set_mat4(&ctx, "position", &position);
self.set_mat4(&ctx, "normal_matrix", &position.inverse().transpose());
}
pub fn set_position_2d(&self, ctx: &context::Context, pos: &glam::Vec2, dims: &glam::Vec2) {
let halfwidth = dims.x / 2.0;
let halfheight = dims.y / 2.0;
self.set_mat4(
&ctx, "position",
&glam::Mat4::from_scale_rotation_translation(
glam::Vec3::new(halfwidth, halfheight, 1.0),
glam::Quat::IDENTITY,
glam::Vec3::new(
-context::RENDER_WIDTH / 2.0 + pos.x + halfwidth,
context::RENDER_HEIGHT / 2.0 - pos.y - halfheight,
0.0,
),
)
);
}
pub fn bind(&self, ctx: &context::Context) {
unsafe {
ctx.gl.use_program(Some(self.program));
}
}
}
|
