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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]);
}
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) {
// Convert a cell color to an actual color based on the color table
int t = int(c & BYTE_MASK);
uint r;
switch(t) {
case 1:
r = color_table[(c >> 8) & BYTE_MASK];
break;
case 2:
r = c >> 8;
break;
default:
r = defval;
}
return r;
uint is_one = uint(one_if_equal_zero_otherwise(t, 1));
uint is_two = uint(one_if_equal_zero_otherwise(t, 2));
uint is_neither_one_nor_two = 1u - is_one - is_two;
return is_one * color_table[(c >> 8) & BYTE_MASK] + is_two * (c >> 8) + is_neither_one_nor_two * defval;
}
vec3 to_color(uint c, uint defval) {