source: opengl-game/asteroid.frag@ 4762301

feature/imgui-sdl points-test
Last change on this file since 4762301 was 0e0f851, checked in by Dmitry Portnoy <dmp1488@…>, 6 years ago

Add a dedicated shader for asteroids, add an OpenGL debug callback, and start implementing the ability for asteroids to change color as they take damage.

  • Property mode set to 100644
File size: 1.6 KB
Line 
1#version 410
2
3in vec3 position_eye, normal_eye, color, light_position_eye, light2_position_eye;
4
5out vec4 frag_color;
6
7// fixed point light properties
8vec3 Ls = vec3(1.0, 1.0, 1.0);
9vec3 Ld = vec3(1.0, 1.0, 1.0);
10vec3 La = vec3(0.2, 0.2, 0.2);
11
12// surface reflectance
13vec3 Ks = vec3(1.0, 1.0, 1.0);
14vec3 Kd = vec3(1.0, 1.5, 1.0);
15vec3 Ka = vec3(0.2, 0.2, 0.2);
16float specular_exponent = 100.0; // specular 'power'
17
18void main() {
19 // ambient intensity
20 vec3 Ia = La * Ka;
21
22 // ambient intensity
23 vec3 Ia2 = La * Ka;
24
25 vec3 direction_to_light_eye = normalize(light_position_eye - position_eye);
26 float dot_prod = max(dot(direction_to_light_eye, normal_eye), 0.0);
27
28 // diffuse intensity
29 vec3 Id = Ld * color * dot_prod;
30
31 vec3 direction_to_light2_eye = normalize(light2_position_eye - position_eye);
32 float dot_prod2 = max(dot(direction_to_light2_eye, normal_eye), 0.0);
33
34 // diffuse intensity
35 vec3 Id2 = Ld * color * dot_prod2;
36
37 vec3 surface_to_viewer_eye = normalize(-position_eye);
38
39 vec3 reflection_eye = reflect(-direction_to_light_eye, normal_eye);
40 float dot_prod_specular = max(dot(reflection_eye, surface_to_viewer_eye), 0.0);
41 float specular_factor = pow(dot_prod_specular, specular_exponent);
42
43 vec3 reflection_eye2 = reflect(-direction_to_light2_eye, normal_eye);
44 float dot_prod_specular2 = max(dot(reflection_eye2, surface_to_viewer_eye), 0.0);
45 float specular_factor2 = pow(dot_prod_specular2, specular_exponent);
46
47 // specular intensity
48 vec3 Is = Ls * Ks * specular_factor;
49 vec3 Is2 = Ls * Ks * specular_factor2;
50
51 frag_color = vec4((Is + Id + Ia + Is2 + Id2 + Ia2)/2, 1.0);
52}
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