From a76f583c2d11043a94c3251ec6a5381d7836bdb4 Mon Sep 17 00:00:00 2001
From: LLLL Colonq <llll@colonq>
Date: Thu, 13 Nov 2025 22:04:56 -0500
Subject: Add TCG

---
 crates/renderer/src/assets/shaders/flat/frag.glsl  |  3 --
 .../renderer/src/assets/shaders/tcg_base/frag.glsl | 60 ++++++++++++++++++++++
 .../renderer/src/assets/shaders/tcg_base/vert.glsl |  4 ++
 .../src/assets/shaders/tcg_screen/frag.glsl        |  7 +--
 4 files changed, 66 insertions(+), 8 deletions(-)
 create mode 100644 crates/renderer/src/assets/shaders/tcg_base/frag.glsl
 create mode 100644 crates/renderer/src/assets/shaders/tcg_base/vert.glsl

(limited to 'crates/renderer/src/assets/shaders')

diff --git a/crates/renderer/src/assets/shaders/flat/frag.glsl b/crates/renderer/src/assets/shaders/flat/frag.glsl
index cab840d..69fe2ec 100644
--- a/crates/renderer/src/assets/shaders/flat/frag.glsl
+++ b/crates/renderer/src/assets/shaders/flat/frag.glsl
@@ -7,9 +7,6 @@ void main()
     float opacity = 1.0 - clamp(transparency, 0.0, 1.0);
     vec2 tcfull = vec2(vertex_texcoord.x, 1.0 - vertex_texcoord.y);
     vec4 texel = texture(texture_data, tcfull);
-    if (texel.a != 1.0) {
-        discard;
-    }
     texel.a *= opacity;
     frag_color = texel;
 } 
diff --git a/crates/renderer/src/assets/shaders/tcg_base/frag.glsl b/crates/renderer/src/assets/shaders/tcg_base/frag.glsl
new file mode 100644
index 0000000..b941d61
--- /dev/null
+++ b/crates/renderer/src/assets/shaders/tcg_base/frag.glsl
@@ -0,0 +1,60 @@
+uniform sampler2D texture_data;
+
+uniform vec4 shift_color;
+
+vec3 rgb_to_hsl(vec3 rgb) {
+    vec3 ret;
+    float min = min(min(rgb.r, rgb.g), rgb.b);
+    float max = max(max(rgb.r, rgb.g), rgb.b);
+    float lum = (max + min) / 2.0;
+    ret.z = lum;
+    if (max == min) {
+        ret.x = ret.y = 0.0;
+    } else {
+        float chroma = max - min;
+        ret.y = chroma / (1.0 - abs(2.0 * lum - 1.0));
+        if (max == rgb.r) {
+            ret.x = (rgb.g - rgb.b) / chroma + (rgb.g < rgb.b ? 6.0 : 0.0);
+        } else if (max == rgb.g) {
+            ret.x = (rgb.b - rgb.r) / chroma + 2.0;
+        } else {
+            ret.x = (rgb.r - rgb.g) / chroma + 4.0;
+        }
+        ret.x /= 6.0;
+    }
+    return ret;
+}
+
+float hue_to_rgb(float p, float q, float t) {
+   if (t < 0.0) t += 1.0;
+   if (t > 1.0) t -= 1.0;
+   if (t < 1.0/6.0) return p + (q - p) * 6.0 * t;
+   if (t < 1.0/2.0) return q;
+   if (t < 2.0/3.0) return p + (q - p) * (2.0/3.0 - t) * 6.0;
+   return p;
+}
+
+vec3 hsl_to_rgb(vec3 hsl) {
+    vec3 ret;
+    if (hsl.y == 0.0) {
+        ret.r = ret.g = ret.b = hsl.z;
+    } else {
+        float q = hsl.z < 0.5 ? hsl.z * (1.0 + hsl.y) : hsl.z + hsl.y - hsl.z * hsl.y;
+        float p = 2.0 * hsl.z - q;
+        ret.r = hue_to_rgb(p, q, hsl.x + 1.0/3.0);
+        ret.g = hue_to_rgb(p, q, hsl.x);
+        ret.b = hue_to_rgb(p, q, hsl.x - 1.0/3.0);
+    }
+    return ret;
+}
+
+void main()
+{
+    vec2 tcfull = vec2(vertex_texcoord.x, 1.0 - vertex_texcoord.y);
+    vec4 texel = texture(texture_data, tcfull);
+    vec3 hsl = rgb_to_hsl(texel.xyz);
+    vec3 shift_hsl = rgb_to_hsl(shift_color.xyz);
+    hsl.x = shift_hsl.x;
+    texel.xyz = hsl_to_rgb(hsl);
+    frag_color = texel;
+} 
diff --git a/crates/renderer/src/assets/shaders/tcg_base/vert.glsl b/crates/renderer/src/assets/shaders/tcg_base/vert.glsl
new file mode 100644
index 0000000..e324f7e
--- /dev/null
+++ b/crates/renderer/src/assets/shaders/tcg_base/vert.glsl
@@ -0,0 +1,4 @@
+void main()
+{
+    default_main();
+}
\ No newline at end of file
diff --git a/crates/renderer/src/assets/shaders/tcg_screen/frag.glsl b/crates/renderer/src/assets/shaders/tcg_screen/frag.glsl
index 2a14860..cb4a58f 100644
--- a/crates/renderer/src/assets/shaders/tcg_screen/frag.glsl
+++ b/crates/renderer/src/assets/shaders/tcg_screen/frag.glsl
@@ -1,15 +1,12 @@
 uniform sampler2D texture_data;
 
-uniform float transparency;
-
 void main()
 {
-    float opacity = 1.0 - clamp(transparency, 0.0, 1.0);
     vec2 tcfull = vec2(vertex_texcoord.x, vertex_texcoord.y);
     vec4 texel = texture(texture_data, tcfull);
-    if (texel.a != 1.0) {
+    if (texel.a == 0.0) {
         discard;
     }
-    texel.a *= opacity;
+    texel.a = 1.0;
     frag_color = texel;
 } 
-- 
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