From: Steinar H. Gunderson Date: Sat, 20 Feb 2016 13:19:19 +0000 (+0100) Subject: Correct/update a comment on rounding. X-Git-Tag: 1.4.0~24 X-Git-Url: https://git.sesse.net/?p=movit;a=commitdiff_plain;h=96fd7f56bf3e5a8e769f9982505889e0273addeb Correct/update a comment on rounding. --- diff --git a/init.h b/init.h index 7e1e130..9646cd4 100644 --- a/init.h +++ b/init.h @@ -50,17 +50,13 @@ extern float movit_texel_subpixel_precision; // Some GPUs use very inaccurate fixed-function circuits for rounding // floating-point values to 8-bit outputs, leading to absurdities like -// the roundoff point between 128 and 129 being 128.62 instead of 128.6. +// the roundoff point between 128 and 129 being 128.62 instead of 128.5. // We test, for every integer, x+0.48 and x+0.52 and check that they // round the right way (giving some leeway, but not a lot); the number // of errors are stored here. // -// If this value is above 0, the extension GL_EXT_gpu_shader4 is available -// (giving round()) and you have enabled dithering, we will round off -// explicitly at the very end of the shader. -// -// Note: I don't know of any cards that round off wrong (well, outside -// our tolerance) and do not have this extension. +// If this value is above 0, we will round off explicitly at the very end +// of the shader. extern int movit_num_wrongly_rounded; extern bool movit_shader_rounding_supported;