Updated color calculation in shader.

1 files changed, 5 insertions, 2 deletions

diff --git a/bullet_fragment.glsl b/bullet_fragment.glsl
index 66f53a4..5e8becd 100644
--- a/bullet_fragment.glsl
+++ b/bullet_fragment.glsl
@@ -7,6 +7,9 @@ void main() {
 	l_uv -= l_offset;
 	l_uv = vec2(v_tex_rot * vec4(l_uv, 0.0, 1.0));
 	l_uv += l_offset;
-	gl_FragColor = vec4(texture2D(tex, l_uv));
-	gl_FragColor.xyz += gl_Color.xyz - gl_Color.xyz * gl_FragColor.x;
+	gl_FragColor = texture2D(tex, l_uv);
+	float M = max(max(gl_FragColor.x, gl_FragColor.y), gl_FragColor.z);
+	float C = M - min(min(gl_FragColor.x, gl_FragColor.y), gl_FragColor.z);
+	float S = C > 0.0 ? C / M : 0.0;
+	gl_FragColor.xyz = M * mix(vec3(1.0, 1.0, 1.0), gl_Color.xyz, S);
 }