pke: add bounding region to glyphs for ui overdraw

1 files changed, 9 insertions, 2 deletions

diff --git a/assets/shaders/glyph.frag b/assets/shaders/glyph.frag
index 867c58c..9867925 100644
--- a/assets/shaders/glyph.frag
+++ b/assets/shaders/glyph.frag
@@ -2,8 +2,11 @@
 
 layout(location = 0) in vec4 in_fg_color;
 layout(location = 1) in vec4 in_bg_color;
-layout(location = 2) in vec2 in_uv;
-layout(location = 3) in float in_width;
+layout(location = 2) in vec2 in_bounding_region_min;
+layout(location = 3) in vec2 in_bounding_region_max;
+layout(location = 4) in vec2 in_uv;
+layout(location = 5) in vec2 in_screen_px;
+layout(location = 6) in float in_width;
 
 layout(location = 0) out vec4 out_color;
 
@@ -14,6 +17,10 @@ float median(float r, float g, float b) {
 }
 
 void main() {
+	if (in_screen_px.x < in_bounding_region_min.x) discard;
+	if (in_screen_px.y < in_bounding_region_min.y) discard;
+	if (in_screen_px.x > in_bounding_region_max.x) discard;
+	if (in_screen_px.y > in_bounding_region_max.y) discard;
 	vec4 msd = texture(mtsdf_sampler, in_uv);
 	float sd = median(msd.r, msd.g, msd.b);
 	float screenPxDistance = in_width * (sd - 0.5);