caper 0.13.0

Minimalist game framework
Documentation 
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/// Default shaders
pub mod default;
/// Distance shaders for roll off to white in relation to the camera position
pub mod dist;
/// Height shaders for rolling of to white in relation to the y-axis
pub mod height;
/// Line shaders for rendering wireframes
pub mod line;
/// Default post effect shader
pub mod post;
/// Shader for rendering with textures
pub mod texture;

use glium::texture::compressed_srgb_texture2d::CompressedSrgbTexture2d;
use glium::{Display, Program};
use std::collections::HashMap;
use std::error::Error;

/// Contains all the shaders to be used
pub struct Shaders {
    /// Map containing all the shaders used to render the RenderItems
    pub shaders: HashMap<&'static str, Program>,
    /// Map containing all the shaders to be used for post processing
    pub post_shaders: HashMap<&'static str, Program>,
    /// Texture that can be passed to the shaders
    pub textures: HashMap<&'static str, CompressedSrgbTexture2d>,
}

impl Shaders {
    /// Creates a new instance of Shaders
    pub fn new(display: &Display) -> Shaders {
        let mut shaders = HashMap::new();

        // the shader programs
        shaders.insert(
            "dist",
            program!(display,
            330 => {
                vertex: default::gl330::VERT,
                fragment: dist::gl330::FRAG,
                geometry: default::gl330::GEOM,
                tessellation_control: default::gl330::TESS_CONTROL,
                tessellation_evaluation: default::gl330::TESS_EVAL
            })
            .unwrap(),
        );

        shaders.insert(
            "height",
            program!(display,
            330 => {
                vertex: default::gl330::VERT,
                fragment: height::gl330::FRAG,
                geometry: default::gl330::GEOM,
                tessellation_control: default::gl330::TESS_CONTROL,
                tessellation_evaluation: default::gl330::TESS_EVAL
            })
            .unwrap(),
        );

        shaders.insert(
            "line",
            program!(display,
            330 => {
                vertex: default::gl330::VERT,
                fragment: line::gl330::FRAG,
                geometry: line::gl330::GEOM,
                tessellation_control: default::gl330::TESS_CONTROL,
                tessellation_evaluation: default::gl330::TESS_EVAL
            })
            .unwrap(),
        );

        // the shader programs
        shaders.insert(
            "texture",
            program!(display,
            330 => {
                vertex: default::gl330::VERT,
                fragment: texture::gl330::FRAG,
                geometry: default::gl330::GEOM,
                tessellation_control:
                    default::gl330::TESS_CONTROL,
                    tessellation_evaluation:
                        default::gl330::TESS_EVAL
            })
            .unwrap(),
        );

        let mut post_shaders = HashMap::new();

        post_shaders.insert(
            "default",
            program!(display,
            330 => {
                vertex: post::gl330::VERT,
                fragment: post::gl330::FRAG,
            })
            .unwrap(),
        );

        let mut textures = HashMap::new();

        textures.insert("default", load_texture!("../resources/caper.png", display));
        textures.insert(
            "default_normal",
            load_texture!("../resources/normal.png", display),
        );

        Shaders {
            shaders,
            post_shaders,
            textures,
        }
    }

    /// Add a new shader to the map that can used for rendering the RenderItems
    pub fn add_shader(
        &mut self,
        display: &Display,
        name: &'static str,
        vert: &'static str,
        frag: &'static str,
        geom: &'static str,
        tess_cont: &'static str,
        tess_eval: &'static str,
    ) -> Result<&str, &str> {
        let shader_prog = match program!(display,
        330 => {
            vertex: vert,
            fragment: frag,
            geometry: geom,
            tessellation_control: tess_cont,
            tessellation_evaluation: tess_eval,
        }) {
            Ok(s) => s,
            Err(e) => {
                println!("{}", e.source().unwrap_or(&e));
                return Err("Could not create shader");
            }
        };

        self.shaders.insert(name, shader_prog);

        Ok("shader added")
    }

    /// Add a new shader to the post_shaders map that can be used for rendering post processing
    pub fn add_post_shader(
        &mut self,
        display: &Display,
        name: &'static str,
        vert: &'static str,
        frag: &'static str,
    ) -> Result<&str, &str> {
        let post_shader_prog = match program!(display,
        330 => {
            vertex: vert,
            fragment: frag
        }) {
            Ok(s) => s,
            Err(e) => {
                println!("{}", e.source().unwrap_or(&e));
                return Err("Could not create post shader");
            }
        };

        self.post_shaders.insert(name, post_shader_prog);

        Ok("post shader added")
    }
}