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Remove a switch in the cell vertex shader

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Kovid Goyal
2024-12-15 22:13:11 +05:30
parent e8fa5a3717
commit eb322913c3
1 changed files with 8 additions and 12 deletions
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20
kitty/cell_vertex.glsl
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@@ -76,21 +76,17 @@ vec3 color_to_vec(uint c) {
return vec3(gamma_lut[r], gamma_lut[g], gamma_lut[b]); return vec3(gamma_lut[r], gamma_lut[g], gamma_lut[b]);
} }
float one_if_equal_zero_otherwise(int a, int b) {
return 1.0f - clamp(abs(float(a) - float(b)), 0.0f, 1.0f);
}
uint resolve_color(uint c, uint defval) { uint resolve_color(uint c, uint defval) {
// Convert a cell color to an actual color based on the color table // Convert a cell color to an actual color based on the color table
int t = int(c & BYTE_MASK); int t = int(c & BYTE_MASK);
uint r; uint is_one = uint(one_if_equal_zero_otherwise(t, 1));
switch(t) { uint is_two = uint(one_if_equal_zero_otherwise(t, 2));
case 1: uint is_neither_one_nor_two = 1u - is_one - is_two;
r = color_table[(c >> 8) & BYTE_MASK]; return is_one * color_table[(c >> 8) & BYTE_MASK] + is_two * (c >> 8) + is_neither_one_nor_two * defval;
break;
case 2:
r = c >> 8;
break;
default:
r = defval;
}
return r;
} }
vec3 to_color(uint c, uint defval) { vec3 to_color(uint c, uint defval) {