vo_opengl: fix compatibility with OpenGL 2.1

The srgb_compand() function passes bvec to mix(), which is apparently
not available on GL 2.1 / GLSL 1.20:

0:0(0): error: no matching function for call to `mix(vec3, vec3, bvec3)'
0:0(0): error: candidates are: float mix(float, float, float)
0:0(0): error:                 vec2 mix(vec2, vec2, vec2)
0:0(0): error:                 vec3 mix(vec3, vec3, vec3)
0:0(0): error:                 vec4 mix(vec4, vec4, vec4)
0:0(0): error:                 vec2 mix(vec2, vec2, float)
0:0(0): error:                 vec3 mix(vec3, vec3, float)
0:0(0): error:                 vec4 mix(vec4, vec4, float)

Also add back disabling color management on older GL, as the
srgb_compand() function is needed for that.

1 files changed, 3 insertions, 0 deletions

diff --git a/libvo/vo_opengl_shaders.glsl b/libvo/vo_opengl_shaders.glsl
index 5dd67bbd52..1f302889e4 100644
--- a/libvo/vo_opengl_shaders.glsl
+++ b/libvo/vo_opengl_shaders.glsl
@@ -37,11 +37,14 @@
 # define in varying
 #endif
 
+// Earlier GLSL doesn't support mix() with bvec
+#if __VERSION__ >= 130
 vec3 srgb_compand(vec3 v)
 {
     return mix(1.055 * pow(v, vec3(1.0/2.4)) - vec3(0.055), v * 12.92,
                lessThanEqual(v, vec3(0.0031308)));
 }
+#endif
 
 #!section vertex_all