[MPlayer-cvslog] r34014 - trunk/libvo/gl_common.c

[Clément Bœsch]

On Fri, Aug 26, 2011 at 08:51:52PM +0200, reimar wrote:
> Author: reimar
> Date: Fri Aug 26 20:51:51 2011
> New Revision: 34014
> 
> Log:
> Add disabled feature: noise filter for vo_gl.
> 
> Modified:
>    trunk/libvo/gl_common.c
> 
> Modified: trunk/libvo/gl_common.c
> ==============================================================================
> --- trunk/libvo/gl_common.c	Fri Aug 26 11:46:42 2011	(r34013)
> +++ trunk/libvo/gl_common.c	Fri Aug 26 20:51:51 2011	(r34014)
> @@ -897,6 +897,36 @@ static void gen_spline_lookup_tex(GLenum
>    free(tex);
>  }
>  
> +#define NOISE_RES 2048
> +
> +/**
> + * \brief creates the 1D lookup texture needed to generate pseudo-random numbers.
> + * \param unit texture unit to attach texture to
> + */

IIRC the current preferred Doxygen syntax is with '@'

> +static void gen_noise_lookup_tex(GLenum unit) {
> +  GLfloat *tex = calloc(NOISE_RES, sizeof(*tex));
> +  uint32_t lcg = 0x79381c11;
> +  int i;
> +  for (i = 0; i < NOISE_RES; i++)
> +    tex[i] = (double)i / (NOISE_RES - 1);
> +  for (i = 0; i < NOISE_RES - 1; i++) {
> +    int remain = NOISE_RES - i;
> +    int idx = i + (lcg >> 16) % remain;
> +    GLfloat tmp = tex[i];
> +    tex[i] = tex[idx];
> +    tex[idx] = tmp;
> +    lcg = lcg * 1664525 + 1013904223;

Maybe use av_lfg?

BTW, what is this for? -vf noise is too slow?

-- 
Clément B.
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