Add TCG

1 files changed, 60 insertions, 0 deletions

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;
+}