[Mesa-dev] [PATCH v2 1/2] gallium/util: add helper to compute zmin/zmax for a viewport state

[Brian Paul]

On Sun, Aug 14, 2016 at 11:09 AM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:

> Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
> Cc: "11.2 12.0" <mesa-stable at lists.freedesktop.org>
> ---
>  src/gallium/auxiliary/Makefile.sources  |  3 +-
>  src/gallium/auxiliary/util/u_viewport.h | 59
> +++++++++++++++++++++++++++++++++
>  2 files changed, 61 insertions(+), 1 deletion(-)
>  create mode 100644 src/gallium/auxiliary/util/u_viewport.h
>
> diff --git a/src/gallium/auxiliary/Makefile.sources
> b/src/gallium/auxiliary/Makefile.sources
> index 586f057..2a4919b 100644
> --- a/src/gallium/auxiliary/Makefile.sources
> +++ b/src/gallium/auxiliary/Makefile.sources
> @@ -309,7 +309,8 @@ C_SOURCES := \
>         util/u_upload_mgr.h \
>         util/u_vbuf.c \
>         util/u_vbuf.h \
> -       util/u_video.h
> +       util/u_video.h \
> +       util/u_viewport.h
>
>  NIR_SOURCES := \
>         nir/tgsi_to_nir.c \
> diff --git a/src/gallium/auxiliary/util/u_viewport.h
> b/src/gallium/auxiliary/util/u_viewport.h
> new file mode 100644
> index 0000000..a731b34
> --- /dev/null
> +++ b/src/gallium/auxiliary/util/u_viewport.h
> @@ -0,0 +1,59 @@
> +/**********************************************************
> ****************
> + *
> + * Copyright 2016 Ilia Mirkin.
> + * All Rights Reserved.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the
> + * "Software"), to deal in the Software without restriction, including
> + * without limitation the rights to use, copy, modify, merge, publish,
> + * distribute, sub license, and/or sell copies of the Software, and to
> + * permit persons to whom the Software is furnished to do so, subject to
> + * the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the
> + * next paragraph) shall be included in all copies or substantial portions
> + * of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
> + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
> + * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
> + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
> CONTRACT,
> + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
> + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
> + *
> + ************************************************************
> **************/
> +
> +#ifndef U_VIEWPORT_H
> +#define U_VIEWPORT_H
> +
> +#include "c99_compat.h"
> +#include "pipe/p_state.h"
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +static inline void
> +util_viewport_zmin_zmax(const struct pipe_viewport_state *vp, bool halfz,
> +                        float *zmin, float *zmax)
> +{
> +   float a, b;
> +   if (halfz) {
> +      a = vp->translate[2];
> +      b = vp->translate[2] + vp->scale[2];
> +   } else {
> +      a = vp->translate[2] - vp->scale[2];
> +      b = vp->translate[2] + vp->scale[2];
> +   }
> +
> +   *zmin = a < b ? a : b;
> +   *zmax = a < b ? b : a;
>

or, *zmin = MIN2(a, b);  *zmax = MAX2(a, b);

-Brian


> +}
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif
> --
> 2.7.3
>
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