ADD: [gles] enable contrast & brightness controls

1 files changed, 8 insertions, 1 deletions

diff --git a/system/shaders/guishader_frag_rgba_bob.glsl b/system/shaders/guishader_frag_rgba_bob.glsl
index 3b02726496..d2d75f977b 100644
--- a/system/shaders/guishader_frag_rgba_bob.glsl
+++ b/system/shaders/guishader_frag_rgba_bob.glsl
@@ -28,6 +28,9 @@ uniform int       m_method;
 uniform int       m_field;
 uniform float     m_step;
 
+uniform float     m_brightness;
+uniform float     m_contrast;
+
 void main ()
 {
   vec2 source;
@@ -43,5 +46,9 @@ void main ()
   below.x = source.x;
   below.y = source.y + (2.0*m_step*bstep);
 
-  gl_FragColor = mix(texture2D(m_samp0, source), texture2D(m_samp0, below), 0.5);
+  vec4 color = mix(texture2D(m_samp0, source), texture2D(m_samp0, below), 0.5);
+  color = color * m_contrast;
+  color = color + m_brightness;
+
+  gl_FragColor.rgba = color;
 }