/* Copyright (c) 2016-2026 Li Jin <dragon-fly@qq.com>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

extern "C" {
	fn pass_type() -> i32;
	fn pass_set_grab_pass(slf: i64, val: i32);
	fn pass_is_grab_pass(slf: i64) -> i32;
	fn pass_set(slf: i64, name: i64, val: f32);
	fn pass_set_vec4(slf: i64, name: i64, val_1: f32, val_2: f32, val_3: f32, val_4: f32);
	fn pass_set_color(slf: i64, name: i64, val: i32);
	fn pass_set_texture(slf: i64, name: i64, texture: i64, slot: i32);
	fn pass_remove(slf: i64, name: i64);
	fn pass_new(vert_shader: i64, frag_shader: i64) -> i64;
}
use crate::dora::IObject;
/// A struct representing a shader pass.
pub struct Pass { raw: i64 }
crate::dora_object!(Pass);
impl Pass {
	pub(crate) fn type_info() -> (i32, fn(i64) -> Option<Box<dyn IObject>>) {
		(unsafe { pass_type() }, |raw: i64| -> Option<Box<dyn IObject>> {
			match raw {
				0 => None,
				_ => Some(Box::new(Pass { raw: raw }))
			}
		})
	}
	/// Sets whether this Pass should be a grab pass.
	/// A grab pass will render a portion of game scene into a texture frame buffer.
	/// Then use this texture frame buffer as an input for next render pass.
	pub fn set_grab_pass(&mut self, val: bool) {
		unsafe { pass_set_grab_pass(self.raw(), if val { 1 } else { 0 }) };
	}
	/// Gets whether this Pass should be a grab pass.
	/// A grab pass will render a portion of game scene into a texture frame buffer.
	/// Then use this texture frame buffer as an input for next render pass.
	pub fn is_grab_pass(&self) -> bool {
		return unsafe { pass_is_grab_pass(self.raw()) != 0 };
	}
	/// Sets the value of shader parameters.
	///
	/// # Arguments
	///
	/// * `name` - The name of the parameter to set.
	/// * `val` - The numeric value to set.
	pub fn set(&mut self, name: &str, val: f32) {
		unsafe { pass_set(self.raw(), crate::dora::from_string(name), val); }
	}
	/// Sets the values of shader parameters.
	///
	/// # Arguments
	///
	/// * `name` - The name of the parameter to set.
	/// * `val1` - The first numeric value to set.
	/// * `val2` - An optional second numeric value to set.
	/// * `val3` - An optional third numeric value to set.
	/// * `val4` - An optional fourth numeric value to set.
	pub fn set_vec4(&mut self, name: &str, val_1: f32, val_2: f32, val_3: f32, val_4: f32) {
		unsafe { pass_set_vec4(self.raw(), crate::dora::from_string(name), val_1, val_2, val_3, val_4); }
	}
	/// Another function that sets the values of shader parameters.
	///
	/// Works the same as:
	/// pass.set("varName", color.r / 255.0, color.g / 255.0, color.b / 255.0, color.opacity);
	///
	/// # Arguments
	///
	/// * `name` - The name of the parameter to set.
	/// * `val` - The Color object to set.
	pub fn set_color(&mut self, name: &str, val: &crate::dora::Color) {
		unsafe { pass_set_color(self.raw(), crate::dora::from_string(name), val.to_argb() as i32); }
	}
	/// Binds a texture to a sampler uniform and texture slot.
	///
	/// # Arguments
	///
	/// * `name` - The sampler name in the shader.
	/// * `texture` - The texture to bind.
	/// * `slot` - The texture slot index.
	pub fn set_texture(&mut self, name: &str, texture: &crate::dora::Texture2D, slot: i32) {
		unsafe { pass_set_texture(self.raw(), crate::dora::from_string(name), texture.raw(), slot); }
	}
	/// Removes a previously set uniform or sampler binding by name.
	///
	/// # Arguments
	///
	/// * `name` - The uniform name in the shader.
	pub fn remove(&mut self, name: &str) {
		unsafe { pass_remove(self.raw(), crate::dora::from_string(name)); }
	}
	/// Creates a new Pass object.
	///
	/// # Arguments
	///
	/// * `vert_shader` - The vertex shader file string.
	/// * `frag_shader` - The fragment shader file string.
	///
	/// A shader file string must be one of the formats:
	///     * `builtin:` + theBuiltinShaderName
	///     * `shader_compiled_file.bin`
	///     * `Shader/shader_source_file.sc`
	///
	/// Details:
	///     * `"builtin:" + name` loads an embedded built-in shader.
	///     * For `.sc` files, the given path is loaded as shader source and compiled immediately.
	///     * For `.bin` files, if the given path exists, it is loaded directly.
	///     * Otherwise the engine tries `renderer_dir/filename.bin`, where `renderer_dir`
	///       depends on the active backend, such as `dx11`, `metal`, `glsl`, `essl`, or `spirv`.
	///
	/// # Returns
	///
	/// * `Pass` - A new Pass object.
	pub fn new(vert_shader: &str, frag_shader: &str) -> Pass {
		unsafe { return Pass { raw: pass_new(crate::dora::from_string(vert_shader), crate::dora::from_string(frag_shader)) }; }
	}
}