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fix the baseline for font rendering

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This commit is contained in:
Mitchell Hashimoto
2022-04-19 19:30:30 -07:00
parent e2ed1ed745
commit d250bcda65
4 changed files with 23 additions and 11 deletions
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10
shaders/cell.v.glsl
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@@ -44,6 +44,7 @@ flat out uint mode;
uniform sampler2D text;
uniform vec2 cell_size;
uniform mat4 projection;
uniform float glyph_baseline;
/********************************************************************
* Modes
@@ -99,11 +100,12 @@ void main() {
break;
case MODE_FG:
// The glyph offset is upside down so we need to reverse it to
// be based on the offset of our cell. This is equivalent to
// "1 - value" to flip the value.
// The glyph_offset.y is the y bearing, a y value that when added
// to the baseline is the offset (+y is up). Our grid goes down.
// So we flip it with `cell_size.y - glyph_offset.y`. The glyph_baseline
// uniform sets our line baseline where characters "sit".
vec2 glyph_offset_calc = glyph_offset;
glyph_offset_calc.y = cell_size.y - glyph_offset.y;
glyph_offset_calc.y = cell_size.y - glyph_offset.y - glyph_baseline;
// Calculate the final position of the cell.
cell_pos = cell_pos + glyph_size * position + glyph_offset_calc;