diff options
| author | yum <yum.food.vr@gmail.com> | 2025-03-25 17:03:16 -0700 |
|---|---|---|
| committer | yum <yum.food.vr@gmail.com> | 2025-03-25 17:03:16 -0700 |
| commit | 2a5186af2dce81d7d630f2969cfc5bcf2e2ddd66 (patch) | |
| tree | 4ed8dac2899cc5e250551585391dc96f51dfe423 /letter_grid.cginc | |
| parent | b377dd05175d5bffaeef9c55051cd396c127daef (diff) | |
Add letter grid gimmick
Diffstat (limited to 'letter_grid.cginc')
| -rw-r--r-- | letter_grid.cginc | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/letter_grid.cginc b/letter_grid.cginc new file mode 100644 index 0000000..0cd197d --- /dev/null +++ b/letter_grid.cginc @@ -0,0 +1,85 @@ +#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
+
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