1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151

// Copyright (c) 2021 Joone Hur <joone@kldp.org> All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

extern crate gl;

use self::gl::types::*;
use std::ffi::CString;
use std::ptr;
use std::str;

use crate::stage::Stage;
use crate::actor::Actor;
use crate::actor::EventHandler;

const VERTEX_SHADER_SOURCE: &str = r#"
    #version 330 core
    layout(location = 0) in vec4 a_position;
    layout(location = 1) in vec2 a_texCoord;

    uniform mat4 transform;
    out vec2 v_texCoord;

    void main() {
      gl_Position = transform * a_position;
      v_texCoord = a_texCoord;
    }
"#;

const FRAGMENT_SHADER_SOURCE: &str = r#"
    #version 330 core
    out vec4 outColor;
    uniform vec4 color;

    in vec2 v_texCoord;
    uniform sampler2D s_texture;

    void main() {
      if (v_texCoord[0] == 0.0f)
        outColor = color;
      else {
        outColor = texture(s_texture, v_texCoord);
      }
    }
"#;

pub fn render(name:String) {
   println!("Render {}", name);
}

pub struct Play<'a>  {
  name : String,
  pub stage_list: Vec<Stage<'a>>,
  shader_program: GLuint,
}

impl<'a> Play<'a>  {
  pub fn new(name: String) -> Self {
    Play {
      name : name,
      stage_list: Vec::new(),
      shader_program: 0,
    }
  }

pub fn initialize(&mut self) {
  self.compile_shader();
}

/*pub fn new_actor(&self, name: String, w: u32, h: u32, evet_handler: Box<&'a mut (dyn EventHandler + 'a)>) -> Actor {
  Actor::new(name, w, h, evet_handler)
}*/

 // https://github.com/bwasty/learn-opengl-rs/blob/master/src/_1_getting_started/_2_1_hello_triangle.rs
 fn compile_shader(&mut self) {
    unsafe {
      // build and compile our shader program
      // vertex shader
      let vertex_shader = gl::CreateShader(gl::VERTEX_SHADER);
      let c_str_vert = CString::new(VERTEX_SHADER_SOURCE.as_bytes()).unwrap();
      gl::ShaderSource(vertex_shader, 1, &c_str_vert.as_ptr(), ptr::null());
      gl::CompileShader(vertex_shader);

      // check for shader compile errors
      let mut success = gl::FALSE as GLint;
      let mut info_log = Vec::with_capacity(512);
      info_log.set_len(512 - 1); // subtract 1 to skip the trailing null character
      gl::GetShaderiv(vertex_shader, gl::COMPILE_STATUS, &mut success);
      if success != gl::TRUE as GLint {
          gl::GetShaderInfoLog(vertex_shader, 512, ptr::null_mut(), info_log.as_mut_ptr() as *mut GLchar);
          //println!("ERROR::SHADER::VERTEX::COMPILATION_FAILED\n{}", str::from_utf8(&info_log).unwrap());
          let s = str::from_utf8(&info_log);
            match s {
            Err(_) => { println!("Failed to decode using"); }
            Ok(s) => { println!("Decoded with  to '{}'", s); }
        }
      }

      // fragment shader
      let fragment_shader = gl::CreateShader(gl::FRAGMENT_SHADER);
      let c_str_frag = CString::new(FRAGMENT_SHADER_SOURCE.as_bytes()).unwrap();
      gl::ShaderSource(fragment_shader, 1, &c_str_frag.as_ptr(), ptr::null());
      gl::CompileShader(fragment_shader);
      // check for shader compile errors
      gl::GetShaderiv(fragment_shader, gl::COMPILE_STATUS, &mut success);
      if success != gl::TRUE as GLint {
          gl::GetShaderInfoLog(fragment_shader, 512, ptr::null_mut(), info_log.as_mut_ptr() as *mut GLchar);
          println!("ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n{}", str::from_utf8(&info_log).unwrap());
      }

      // link shaders
      self.shader_program = gl::CreateProgram();
      gl::AttachShader(self.shader_program, vertex_shader);
      gl::AttachShader(self.shader_program, fragment_shader);
      gl::LinkProgram(self.shader_program);
      // check for linking errors
      gl::GetProgramiv(self.shader_program, gl::LINK_STATUS, &mut success);
      if success != gl::TRUE as GLint {
          gl::GetProgramInfoLog(self.shader_program, 512, ptr::null_mut(), info_log.as_mut_ptr() as *mut GLchar);
          println!("ERROR::SHADER::PROGRAM::COMPILATION_FAILED\n{}", str::from_utf8(&info_log).unwrap());
      }
      gl::DeleteShader(vertex_shader);
      gl::DeleteShader(fragment_shader);
    }
  }

  pub fn add_stage(&mut self,  mut stage: Stage<'a>) -> usize {
    stage.initialize();
    self.stage_list.push(stage);

    return self.stage_list.len() - 1
  }

  pub fn handle_input(&mut self, key: usize) {
    // println!("key: {}", key);
    for stage in self.stage_list.iter_mut() {
        stage.handle_input(key);
    }
  }

  pub fn render(&mut self) {
    unsafe {
      gl::ClearColor(0.2, 0.3, 0.3, 1.0);
      gl::Clear(gl::COLOR_BUFFER_BIT);

      for stage in self.stage_list.iter_mut() {
        stage.render(self.shader_program);
      }
    }
  }
}