From cfc7accbb1b4cddaa3ab53558d5067218afcdd0e Mon Sep 17 00:00:00 2001
From: LLLL Colonq <llll@colonq>
Date: Fri, 5 Jun 2026 16:20:33 -0400
Subject: Add transparency flag

---
 crates/teleia/src/assets/shaders/uber/frag.glsl |  5 ++++
 crates/teleia/src/context.rs                    |  3 ++-
 crates/teleia/src/renderer.rs                   | 31 +++++++++++++++++--------
 3 files changed, 28 insertions(+), 11 deletions(-)

(limited to 'crates')

diff --git a/crates/teleia/src/assets/shaders/uber/frag.glsl b/crates/teleia/src/assets/shaders/uber/frag.glsl
index 6778156..31efd0d 100644
--- a/crates/teleia/src/assets/shaders/uber/frag.glsl
+++ b/crates/teleia/src/assets/shaders/uber/frag.glsl
@@ -22,6 +22,8 @@ uniform float effect_flash;
 uniform float effect_hueshift;
 uniform float effect_huescale;
 
+uniform float opacity;
+
 in vec2 vertex_texcoord;
 in vec3 vertex_color;
 in vec3 vertex_normal;
@@ -190,4 +192,7 @@ void main() {
     if (flag(VERTEX_COLOR)) {
         frag_color.rgb = vertex_color;
     }
+    if (flag(OPACITY)) {
+        frag_color.a *= opacity;
+    }
 }
diff --git a/crates/teleia/src/context.rs b/crates/teleia/src/context.rs
index bc0272c..82ce27f 100644
--- a/crates/teleia/src/context.rs
+++ b/crates/teleia/src/context.rs
@@ -111,7 +111,8 @@ impl Context {
             self.gl.depth_func(glow::LEQUAL);
 
             self.gl.enable(glow::BLEND);
-            self.gl.blend_func(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA);
+            self.gl.blend_equation_separate(glow::FUNC_ADD, glow::MAX);
+            self.gl.blend_func_separate(glow::SRC_ALPHA, glow::ONE_MINUS_SRC_ALPHA, glow::ONE, glow::ZERO);
 
             self.gl.enable(glow::STENCIL_TEST);
 
diff --git a/crates/teleia/src/renderer.rs b/crates/teleia/src/renderer.rs
index 32ce016..faad4f7 100644
--- a/crates/teleia/src/renderer.rs
+++ b/crates/teleia/src/renderer.rs
@@ -5,16 +5,17 @@ use bitflags::bitflags;
 bitflags! {
     #[derive(Clone, Copy, Debug, PartialEq, Eq)]
     pub struct UberFlags: u32 {
-        const TEXTURE_COLOR       = 0b0000000001;
-        const TEXTURE_NORMAL      = 0b0000000010;
-        const FLIP_TEXTURE        = 0b0000000100;
-        const LIGHT_AMBIENT       = 0b0000001000;
-        const LIGHT_DIR           = 0b0000010000;
-        const LIGHT_POINT         = 0b0000100000;
-        const SPRITE              = 0b0001000000;
-        const EFFECTS             = 0b0010000000;
-        const YSKEW               = 0b0100000000;
-        const VERTEX_COLOR        = 0b1000000000;
+        const TEXTURE_COLOR       = 0b00000000001;
+        const TEXTURE_NORMAL      = 0b00000000010;
+        const FLIP_TEXTURE        = 0b00000000100;
+        const LIGHT_AMBIENT       = 0b00000001000;
+        const LIGHT_DIR           = 0b00000010000;
+        const LIGHT_POINT         = 0b00000100000;
+        const SPRITE              = 0b00001000000;
+        const EFFECTS             = 0b00010000000;
+        const YSKEW               = 0b00100000000;
+        const VERTEX_COLOR        = 0b01000000000;
+        const OPACITY             = 0b10000000000;
     }
 }
 impl UberFlags {
@@ -223,6 +224,16 @@ impl<A: Assets> Renderer<A> {
         );
     }
 
+    pub fn clear(&mut self,
+        ctx: &context::Context, _st: &mut state::State,
+        color: glam::Vec4
+    ) {
+        self.texture = BoundTexture::None;
+        self.shader = BoundShader::None;
+        ctx.clear_color(color);
+        ctx.clear();
+    }
+
     /// Common case: draw the given textured mesh in the world (units are world tiles)
     pub fn textured_mesh_world(&mut self,
         ctx: &context::Context, st: &mut state::State,
-- 
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