#[macro_use]
extern crate glium;
extern crate cgmath;
extern crate image;
use glium::glutin;
use glium::index::PrimitiveType;
use glium::Surface;
use glium::DisplayBuild;
use std::io::Cursor;
mod support;
fn main() {
use cgmath::SquareMatrix;
use glium::DisplayBuild;
let display = glutin::WindowBuilder::new()
.with_dimensions(800, 500)
.with_title(format!("Glium Deferred Example"))
.build_glium()
.unwrap();
let image = image::load(Cursor::new(&include_bytes!("../tests/fixture/opengl.png")[..]), image::PNG).unwrap().to_rgba();
let image_dimensions = image.dimensions();
let image = glium::texture::RawImage2d::from_raw_rgba_reversed(image.into_raw(), image_dimensions);
let opengl_texture = glium::texture::Texture2d::new(&display, image).unwrap();
let floor_vertex_buffer = {
#[derive(Copy, Clone)]
struct Vertex {
position: [f32; 4],
normal: [f32; 4],
texcoord: [f32; 2]
}
implement_vertex!(Vertex, position, normal, texcoord);
glium::VertexBuffer::new(&display,
&[
Vertex { position: [-1.0, 0.0, -1.0, 1.0], normal: [0.0, 1.0, 0.0, 1.0], texcoord: [1.0, 0.0] },
Vertex { position: [1.0, 0.0, -1.0, 1.0], normal: [0.0, 1.0, 0.0, 1.0], texcoord: [0.0, 0.0] },
Vertex { position: [1.0, 0.0, 1.0, 1.0], normal: [0.0, 1.0, 0.0, 1.0], texcoord: [0.0, 1.0] },
Vertex { position: [-1.0, 0.0, 1.0, 1.0], normal: [0.0, 1.0, 0.0, 1.0], texcoord: [1.0, 1.0] },
]
).unwrap()
};
let floor_index_buffer = glium::IndexBuffer::new(&display, PrimitiveType::TrianglesList,
&[0u16, 1, 2, 0, 2, 3]).unwrap();
let quad_vertex_buffer = {
#[derive(Copy, Clone)]
struct Vertex {
position: [f32; 4],
texcoord: [f32; 2]
}
implement_vertex!(Vertex, position, texcoord);
glium::VertexBuffer::new(&display,
&[
Vertex { position: [0.0, 0.0, 0.0, 1.0], texcoord: [0.0, 0.0] },
Vertex { position: [800.0, 0.0, 0.0, 1.0], texcoord: [1.0, 0.0] },
Vertex { position: [800.0, 500.0, 0.0, 1.0], texcoord: [1.0, 1.0] },
Vertex { position: [0.0, 500.0, 0.0, 1.0], texcoord: [0.0, 1.0] },
]
).unwrap()
};
let quad_index_buffer = glium::IndexBuffer::new(&display, PrimitiveType::TrianglesList,
&[0u16, 1, 2, 0, 2, 3]).unwrap();
let prepass_program = glium::Program::from_source(&display,
"
#version 140
uniform mat4 perspective_matrix;
uniform mat4 view_matrix;
uniform mat4 model_matrix;
in vec4 position;
in vec4 normal;
in vec2 texcoord;
smooth out vec4 frag_position;
smooth out vec4 frag_normal;
smooth out vec2 frag_texcoord;
void main() {
frag_position = model_matrix * position;
frag_normal = model_matrix * normal;
frag_texcoord = texcoord;
gl_Position = perspective_matrix * view_matrix * frag_position;
}
",
"
#version 140
uniform sampler2D tex;
smooth in vec4 frag_position;
smooth in vec4 frag_normal;
smooth in vec2 frag_texcoord;
out vec4 output1;
out vec4 output2;
out vec4 output3;
out vec4 output4;
void main() {
output1 = vec4(frag_position);
output2 = vec4(frag_normal);
output3 = texture(tex, frag_texcoord);
output4 = vec4(1.0, 0.0, 1.0, 1.0);
}
",
None)
.unwrap();
let lighting_program = glium::Program::from_source(&display,
"
#version 140
uniform mat4 matrix;
in vec4 position;
in vec2 texcoord;
smooth out vec2 frag_texcoord;
void main() {
gl_Position = matrix * position;
frag_texcoord = texcoord;
}
",
"
#version 140
uniform sampler2D position_texture;
uniform sampler2D normal_texture;
uniform vec4 light_position;
uniform vec3 light_color;
uniform vec3 light_attenuation;
uniform float light_radius;
smooth in vec2 frag_texcoord;
out vec4 frag_output;
void main() {
vec4 position = texture(position_texture, frag_texcoord);
vec4 normal = texture(normal_texture, frag_texcoord);
vec3 light_vector = light_position.xyz - position.xyz;
float light_distance = abs(length(light_vector));
vec3 normal_vector = normalize(normal.xyz);
float diffuse = max(dot(normal_vector, light_vector), 0.0);
if (diffuse > 0.0) {
float attenuation_factor = 1.0 / (
light_attenuation.x +
(light_attenuation.y * light_distance) +
(light_attenuation.z * light_distance * light_distance)
);
attenuation_factor *= (1.0 - pow((light_distance / light_radius), 2.0));
diffuse *= attenuation_factor;
}
frag_output = vec4(light_color * diffuse, 1.0);
}
",
None)
.unwrap();
let composition_program = glium::Program::from_source(&display,
"
#version 140
uniform mat4 matrix;
in vec4 position;
in vec2 texcoord;
smooth out vec2 frag_texcoord;
void main() {
frag_texcoord = texcoord;
gl_Position = matrix * position;
}
",
"
#version 140
uniform sampler2D decal_texture;
uniform sampler2D lighting_texture;
smooth in vec2 frag_texcoord;
out vec4 frag_output;
void main() {
vec4 lighting_value = texture(lighting_texture, frag_texcoord);
frag_output = vec4(texture(decal_texture, frag_texcoord).rgb * lighting_value.rgb, 1.0);
}
",
None)
.unwrap();
struct Light {
position: [f32; 4],
color: [f32; 3],
attenuation: [f32; 3],
radius: f32
}
let texture1 = glium::texture::Texture2d::empty_with_format(&display, glium::texture::UncompressedFloatFormat::F32F32F32F32, glium::texture::MipmapsOption::NoMipmap, 800, 500).unwrap();
let texture2 = glium::texture::Texture2d::empty_with_format(&display, glium::texture::UncompressedFloatFormat::F32F32F32F32, glium::texture::MipmapsOption::NoMipmap, 800, 500).unwrap();
let texture3 = glium::texture::Texture2d::empty_with_format(&display, glium::texture::UncompressedFloatFormat::F32F32F32F32, glium::texture::MipmapsOption::NoMipmap, 800, 500).unwrap();
let texture4 = glium::texture::Texture2d::empty_with_format(&display, glium::texture::UncompressedFloatFormat::F32F32F32F32, glium::texture::MipmapsOption::NoMipmap, 800, 500).unwrap();
let depthtexture = glium::texture::DepthTexture2d::empty_with_format(&display, glium::texture::DepthFormat::F32, glium::texture::MipmapsOption::NoMipmap, 800, 500).unwrap();
let output = &[("output1", &texture1), ("output2", &texture2), ("output3", &texture3), ("output4", &texture4)];
let mut framebuffer = glium::framebuffer::MultiOutputFrameBuffer::with_depth_buffer(&display, output.iter().cloned(), &depthtexture).unwrap();
let light_texture = glium::texture::Texture2d::empty_with_format(&display, glium::texture::UncompressedFloatFormat::F32F32F32F32, glium::texture::MipmapsOption::NoMipmap, 800, 500).unwrap();
let mut light_buffer = glium::framebuffer::SimpleFrameBuffer::with_depth_buffer(&display, &light_texture, &depthtexture).unwrap();
let ortho_matrix: cgmath::Matrix4<f32> = cgmath::ortho(0.0, 800.0, 0.0, 500.0, -1.0, 1.0);
let perspective_matrix: cgmath::Matrix4<f32> = cgmath::perspective(cgmath::deg(45.0), 1.333, 0.0001, 100.0);
let view_eye: cgmath::Point3<f32> = cgmath::Point3::new(0.0, 2.0, -2.0);
let view_center: cgmath::Point3<f32> = cgmath::Point3::new(0.0, 0.0, 0.0);
let view_up: cgmath::Vector3<f32> = cgmath::Vector3::new(0.0, 1.0, 0.0);
let view_matrix: cgmath::Matrix4<f32> = cgmath::Matrix4::look_at(view_eye, view_center, view_up);
let model_matrix: cgmath::Matrix4<f32> = cgmath::Matrix4::identity();
let lights = [
Light {
position: [1.0, 1.0, 1.0, 1.0],
attenuation: [0.8, 0.00125, 0.0000001],
color: [1.0, 0.0, 0.0],
radius: 1.5
},
Light {
position: [0.0, 1.0, 0.0, 1.0],
attenuation: [0.8, 0.00125, 0.0000001],
color: [0.0, 1.0, 0.0],
radius: 1.5
},
Light {
position: [0.0, 1.0, 1.0, 1.0],
attenuation: [0.8, 0.00125, 0.0000001],
color: [0.0, 0.0, 1.0],
radius: 1.5
},
Light {
position: [1.0, 1.0, 0.0, 1.0],
attenuation: [0.8, 0.00125, 0.0000001],
color: [1.0, 1.0, 0.0],
radius: 1.5
}
];
support::start_loop(|| {
let uniforms = uniform! {
perspective_matrix: Into::<[[f32; 4]; 4]>::into(perspective_matrix),
view_matrix: Into::<[[f32; 4]; 4]>::into(view_matrix),
model_matrix: Into::<[[f32; 4]; 4]>::into(model_matrix),
tex: &opengl_texture
};
framebuffer.clear_color(0.0, 0.0, 0.0, 0.0);
framebuffer.draw(&floor_vertex_buffer, &floor_index_buffer, &prepass_program, &uniforms, &Default::default()).unwrap();
let draw_params = glium::DrawParameters {
blend: glium::Blend {
color: glium::BlendingFunction::Addition {
source: glium::LinearBlendingFactor::One,
destination: glium::LinearBlendingFactor::One
},
alpha: glium::BlendingFunction::Addition {
source: glium::LinearBlendingFactor::One,
destination: glium::LinearBlendingFactor::One
},
constant_value: (1.0, 1.0, 1.0, 1.0)
},
.. Default::default()
};
light_buffer.clear_color(0.0, 0.0, 0.0, 0.0);
for light in lights.iter() {
let uniforms = uniform! {
matrix: Into::<[[f32; 4]; 4]>::into(ortho_matrix),
position_texture: &texture1,
normal_texture: &texture2,
light_position: light.position,
light_attenuation: light.attenuation,
light_color: light.color,
light_radius: light.radius
};
light_buffer.draw(&quad_vertex_buffer, &quad_index_buffer, &lighting_program, &uniforms, &draw_params).unwrap();
}
let uniforms = uniform! {
matrix: Into::<[[f32; 4]; 4]>::into(ortho_matrix),
decal_texture: &texture3,
lighting_texture: &light_texture
};
let mut target = display.draw();
target.clear_color(0.0, 0.0, 0.0, 0.0);
target.draw(&quad_vertex_buffer, &quad_index_buffer, &composition_program, &uniforms, &Default::default()).unwrap();
target.finish().unwrap();
for event in display.poll_events() {
match event {
glutin::Event::Closed => return support::Action::Stop,
_ => ()
}
}
support::Action::Continue
});
}