love-demo2/shader/test.frag

#version 330 core

in vec3 PixelNormal;
in vec2 PixelTexture;
in float PixelBlock;

out vec4 FragColor;

uniform sampler2D TerrainSampler;

/*layout (std140) uniform TexturesLayout
{
  uint Textures[256];
  };*/
int Textures[256] = int[256](
185,
1,
0,
2,
16,
4,
15,
17,
205,
205,
237,
237,
18,
19,
32,
33,
34,
20,
52,
48,
49,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
0,
185,
185,
185,
64,
185,
13,
12,
29,
28,
39,
38,
5,
5,
7,
8,
35,
36,
37,
80,
31,
65,
4,
27,
84,
50,
40,
43,
88,
87,
44,
61,
185,
81,
83,
128,
16,
185,
96,
6,
82,
6,
51,
51,
115,
99,
185,
66,
67,
66,
70,
72,
73,
74,
4,
102,
103,
104,
105,
14,
102,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185,
185
                                   );

void main()
{
  vec3 light_direction = normalize(vec3(-1, -0.5, 0.5));
  float diffuse_intensity = max(dot(normalize(PixelNormal), light_direction), 0.0);

  int terrain_ix = int(Textures[int(PixelBlock)]);
  int terrain_x = terrain_ix % 16;
  int terrain_y = terrain_ix / 16;
  ivec2 coord = ivec2(terrain_x, terrain_y) * 16;
  coord += ivec2(PixelTexture.xy * 16.0);

  vec4 texture_color = texelFetch(TerrainSampler, coord, 0);
  if (texture_color.w != 1.0) {
    discard;
    return;
  }

  if (int(PixelBlock) == 18) // leaves
    texture_color.xyz *= vec3(0.125, 0.494, 0.027);

  FragColor = vec4(texture_color.xyz * vec3(diffuse_intensity), 1.0);
}