Comments on: [Shader Library] Posterization Post Processing Effect (GLSL) http://www.geeks3d.com/20091027/shader-library-posterization-post-processing-effect-glsl/ 3D Tech News, Pixel Hacking, Data Visualization and 3D Programming Sun, 14 Mar 2010 19:12:45 +0200 http://wordpress.org/?v=2.9.1 hourly 1 By: JeGX http://www.geeks3d.com/20091027/shader-library-posterization-post-processing-effect-glsl/comment-page-1/#comment-8180 JeGX Wed, 28 Oct 2009 19:10:12 +0000 http://www.geeks3d.com/?p=5906#comment-8180 you mean: c = pow(c, gamma.rrr); in place of tc = pow(tc, vec3(gamma, gamma, gamma)) ? If so, it's just for the sake of clarity. c = pow(c, gamma.rrr) does not compile with ATI Radeon: "Fragment shader failed to compile with the following errors: WARNING: 0:13: warning(#153) Field selection requires structure, vector, or matrix on left hand side rrr" but c = pow(c, vec3(gamma.rrr)) is okay on Radeon. Funny! you mean:
c = pow(c, gamma.rrr);
in place of
tc = pow(tc, vec3(gamma, gamma, gamma)) ?

If so, it’s just for the sake of clarity.

c = pow(c, gamma.rrr) does not compile with ATI Radeon:
”Fragment shader failed to compile with the following errors:
WARNING: 0:13: warning(#153) Field selection requires structure, vector, or matrix on left hand side rrr”

but
c = pow(c, vec3(gamma.rrr))
is okay on Radeon. Funny!

]]> By: n00body http://www.geeks3d.com/20091027/shader-library-posterization-post-processing-effect-glsl/comment-page-1/#comment-8179 n00body Wed, 28 Oct 2009 18:44:08 +0000 http://www.geeks3d.com/?p=5906#comment-8179 Why didn't the shader author just smear the gamma value? (ie "gamma.rrr" vs "vec3(gamma, gamma, gamma)") Why didn’t the shader author just smear the gamma value? (ie “gamma.rrr” vs “vec3(gamma, gamma, gamma)”)

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