amethyst_renderer 0.10.4

High-level rendering engine with multiple backends
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

#version 150 core

layout (std140) uniform ViewArgs {
    mat4 proj;
    mat4 view;
};

// Quad transform.
in vec2 dir_x;
in vec2 dir_y;
in vec2 pos;
in float depth;

// Texture quad.
in vec2 u_offset;
in vec2 v_offset;

in vec4 color;


out VertexData {
    vec2 tex_uv;
    vec4 color;
} vertex;

const vec2 positions[6] = vec2[](
    // First triangle
    vec2(-0.5, -0.5), // Left bottom
    vec2(0.5, -0.5), // Right bottom
    vec2(0.5, 0.5), // Right top

    // Second triangle
    vec2(0.5, 0.5), // Right top
    vec2(-0.5, 0.5), // Left top
    vec2(-0.5, -0.5)  // Left bottom
);

// coords = 0.0 to 1.0 texture coordinates
vec2 texture_coords(vec2 coords, vec2 u, vec2 v) {
    return vec2(mix(u.x, u.y, coords.x+0.5), mix(v.x, v.y, coords.y+0.5));
}

void main() {
    float tex_u = positions[gl_VertexID][0];
    float tex_v = positions[gl_VertexID][1];

    vec2 uv = pos + tex_u * dir_x + tex_v * dir_y;
    vertex.tex_uv = texture_coords(vec2(tex_u, tex_v), u_offset, v_offset);
    vertex.color = color;
    vec4 vertex = vec4(uv, depth, 1.0);
    gl_Position = proj * view * vertex;
}