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
|
#ifndef __LETTER_GRID_INC
#define __LETTER_GRID_INC
#include "disinfo.cginc"
#include "features.cginc"
#include "globals.cginc"
#include "interpolators.cginc"
#include "math.cginc"
#include "texture_utils.cginc"
#if defined(_LETTER_GRID)
struct LetterGridOutput {
float4 albedo;
float metallic;
float roughness;
float3 emission;
};
LetterGridOutput LetterGrid(v2f i) {
LetterGridOutput output;
int2 cell_pos;
int2 font_res = int2(round(_Letter_Grid_Tex_Res_X), round(_Letter_Grid_Tex_Res_Y));
int2 grid_res = int2(round(_Letter_Grid_Res_X), round(_Letter_Grid_Res_Y));
float2 cell_uv; // uv within each letter cell
float4 scoff = _Letter_Grid_UV_Scale_Offset;
float2 uv = ((i.uv01.xy - 0.5) - scoff.zw) * scoff.xy + 0.5;
bool in_box = getBoxLoc(uv, 0, 1, grid_res, _Letter_Grid_Padding, cell_pos, cell_uv);
// Extract char from _Letter_Grid_Data_Row_0 et al using cell_pos.
cell_pos.y = (grid_res.y - cell_pos.y) - 1;
float c = lerp(
lerp(
_Letter_Grid_Data_Row_0[cell_pos.x],
_Letter_Grid_Data_Row_1[cell_pos.x],
cell_pos.y),
lerp(
_Letter_Grid_Data_Row_2[cell_pos.x],
_Letter_Grid_Data_Row_3[cell_pos.x],
cell_pos.y - 2),
cell_pos.y/2);
c += _Letter_Grid_Global_Offset;
float3 msd = renderInBox(c, uv, cell_uv, _Letter_Grid_Texture, font_res).rgb;
float sd = median(msd);
// Calculate screen pixel range
float screen_px_range;
{
float2 tex_size = float2(_Letter_Grid_Texture_TexelSize.zw);
float2 real_cell_size = floor(tex_size / grid_res); // size of cell in texels
float2 unit_range = _Letter_Grid_Screen_Px_Range / real_cell_size;
float2 screen_tex_size = 1 / fwidth(cell_uv);
screen_px_range = max(0.5 * dot(unit_range, screen_tex_size), _Letter_Grid_Min_Screen_Px_Range);
}
float screen_px_distance = screen_px_range * (sd - _Letter_Grid_Alpha_Threshold);
float smooth_range = (length(grid_res) / sqrt(screen_px_range)) * _Letter_Grid_Blurriness;
float op = smoothstep(-smooth_range, smooth_range, screen_px_distance);
// Sample mask if enabled
#if defined(_LETTER_GRID_MASK)
float mask = _Letter_Grid_Mask.Sample(linear_repeat_s, i.uv01.xy).r;
#else
float mask = 1.0;
#endif
op *= mask;
// Apply blending to output
output.albedo = float4(_Letter_Grid_Color.rgb, op * in_box);
output.metallic = _Letter_Grid_Metallic;
output.roughness = _Letter_Grid_Roughness;
output.emission = _Letter_Grid_Color.rgb * _Letter_Grid_Emission;
return output;
}
#endif // _LETTER_GRID
#endif // __LETTER_GRID_INC
|
