SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/sp_alpha_test.frag

@@ -0,0 +1,41 @@
+in float hue_change;
+
+in vec4 color;
+in vec3 normal;
+in vec2 uv;
+
+layout(location = 0) out vec4 o_diffuse_color;
+layout(location = 1) out vec4 o_normal_color;
+
+#stk_include "utils/encode_normal.frag"
+#stk_include "utils/rgb_conversion.frag"
+#stk_include "utils/sp_texture_sampling.frag"
+
+void main(void)
+{
+    vec4 col = sampleTextureLayer0(uv);
+    if (col.a * color.a < 0.5)
+    {
+        discard;
+    }
+
+    if (hue_change > 0.0)
+    {
+        vec3 old_hsv = rgbToHsv(col.rgb);
+        vec2 new_xy = vec2(hue_change, old_hsv.y);
+        vec3 new_color = hsvToRgb(vec3(new_xy.x, new_xy.y, old_hsv.z));
+        col = vec4(new_color.r, new_color.g, new_color.b, col.a);
+    }
+    col.xyz *= color.xyz;
+
+#if defined(Advanced_Lighting_Enabled)
+    vec4 layer_2 = sampleTextureLayer2(uv);
+    o_diffuse_color = vec4(col.xyz, layer_2.z);
+
+    o_normal_color.xy = EncodeNormal(normalize(normal));
+    o_normal_color.zw = layer_2.xy;
+#else
+    o_diffuse_color = vec4(col.xyz, 1.0);
+#endif
+
+}