Add small programmable text display gimmick

Use Third_Party/gen_atlas to create a 512x512 texture and put it in the
texture slot (the resolution is hardcoded to 512 in shader). Use sliders to
control the grid size. If desired, use global offset to make it possible
to linearly animate between e.g. 0-9 and have it display as ASCII
'0'-'9'.

1 files changed, 65 insertions, 0 deletions

diff --git a/tooner_lighting.cginc b/tooner_lighting.cginc
index 45de66c..92bd069 100644
--- a/tooner_lighting.cginc
+++ b/tooner_lighting.cginc
@@ -2309,6 +2309,68 @@ float4 effect(inout v2f i, out float depth)
   }
 #endif  // _GIMMICK_LETTER_GRID
 
+#if defined(_GIMMICK_LETTER_GRID_2)
+  float3 gimmick_letter_grid_2_emission = 0;
+#if defined(_GIMMICK_LETTER_GRID_2_MASK)
+  float mask = _Gimmick_Letter_Grid_2_Mask.SampleLevel(linear_repeat_s, get_uv_by_channel(i, 0), 0);
+#else
+  float mask = 1;
+#endif
+  {
+    int2 cell_pos;
+    int2 font_res = int2(round(_Gimmick_Letter_Grid_2_Tex_Res_X), round(_Gimmick_Letter_Grid_2_Tex_Res_Y));
+    int2 grid_res = int2(round(_Gimmick_Letter_Grid_2_Res_X), round(_Gimmick_Letter_Grid_2_Res_Y));
+    float2 cell_uv;  // uv within each letter cell
+
+    float4 scoff = _Gimmick_Letter_Grid_2_UV_Scale_Offset;
+    float2 uv = ((get_uv_by_channel(i, 0) - 0.5) - scoff.zw) * scoff.xy + 0.5;
+
+    bool in_box = getBoxLoc(uv,
+        /*bottom_left=*/0,
+        /*top_right=*/1,
+        /*res=*/grid_res,
+        /*padding=*/_Gimmick_Letter_Grid_2_Padding,
+        cell_pos, cell_uv);
+
+    // Extract char from _Gimmick_Letter_Grid_2_Data_Row_0 et al using cell_pos.
+    cell_pos.y = (grid_res.y - cell_pos.y) - 1;
+    float c = lerp(
+      lerp(
+        _Gimmick_Letter_Grid_2_Data_Row_0[cell_pos.x],
+        _Gimmick_Letter_Grid_2_Data_Row_1[cell_pos.x],
+        cell_pos.y),
+      lerp(
+        _Gimmick_Letter_Grid_2_Data_Row_2[cell_pos.x],
+        _Gimmick_Letter_Grid_2_Data_Row_3[cell_pos.x],
+        cell_pos.y - 2),
+      cell_pos.y/2);
+    c += _Gimmick_Letter_Grid_2_Global_Offset;
+
+    float3 msd = renderInBox(c, uv, cell_uv, _Gimmick_Letter_Grid_2_Texture, font_res).rgb;
+    float sd = median(msd);
+    // screenPxRange()
+    float screen_px_range;
+    {
+      float px_range = 2;  // determined by msdf-atlas-gen.exe; 2 is default
+      float texture_res = 512;
+      // Implementation detail from gen_atlas.
+      float2 real_cell_size = floor(texture_res / grid_res);
+      float2 unit_range = 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), 2.0);
+    }
+    float screen_px_distance = screen_px_range * (sd - 0.5);
+    float op = saturate(screen_px_distance + 0.5);
+    op *= mask;
+    op = floor(op);
+
+    albedo = lerp(albedo, _Gimmick_Letter_Grid_2_Color, op * in_box);
+    metallic = lerp(metallic, _Gimmick_Letter_Grid_2_Metallic, op * in_box);
+    roughness = lerp(roughness, _Gimmick_Letter_Grid_2_Roughness, op * in_box);
+    gimmick_letter_grid_2_emission = _Gimmick_Letter_Grid_2_Color * _Gimmick_Letter_Grid_2_Emission * op * in_box;
+  }
+#endif  // _GIMMICK_LETTER_GRID
+
 
 #if defined(_OKLAB)
   // Do hue shift in perceptually uniform color space so it doesn't look like
@@ -2511,6 +2573,9 @@ float4 effect(inout v2f i, out float depth)
 #if defined(_GIMMICK_LETTER_GRID)
   result.rgb += gimmick_letter_grid_emission;
 #endif
+#if defined(_GIMMICK_LETTER_GRID_2)
+  result.rgb += gimmick_letter_grid_2_emission;
+#endif
 
 #if defined(_EXPLODE) && defined(_AUDIOLINK)
   if (AudioLinkIsAvailable() && _Explode_Phase > 1E-6) {