[Piglit] [PATCH 2/5] util/gl: Wrapper to load hex values for half floats
Alejandro Piñeiro
apinheiro at igalia.com
Wed Jun 29 14:28:36 UTC 2016
Reviewed-by: Alejandro Piñeiro <apinheiro at igalia.com>
On 14/06/16 23:36, Andres Gomez wrote:
> For some cases we want to have shaders where we load an exact bit
> pattern into a half float.
>
> Signed-off-by: Andres Gomez <agomez at igalia.com>
> ---
> tests/util/piglit-util-gl.h | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/tests/util/piglit-util-gl.h b/tests/util/piglit-util-gl.h
> index 0954ef5..b416e50 100644
> --- a/tests/util/piglit-util-gl.h
> +++ b/tests/util/piglit-util-gl.h
> @@ -29,6 +29,9 @@
> extern "C" {
> #endif
>
> +#include <errno.h>
> +#include <limits.h>
> +
> #include "piglit-util.h"
>
> #include <piglit/gl_wrap.h>
> @@ -244,6 +247,30 @@ void piglit_draw_rect_from_arrays(const void *verts, const void *tex,
>
> unsigned short piglit_half_from_float(float val);
>
> +/**
> + * Wrapper for piglit_half_from_float() which allows using an exact
> + * hex bit pattern to generate a half float value.
> + */
> +static inline unsigned short
> +strtohf_hex(const char *nptr, char **endptr)
> +{
> + /* skip spaces and tabs */
> + while (*nptr == ' ' || *nptr == '\t')
> + nptr++;
> +
> + if (strncmp(nptr, "0x", 2) == 0) {
> + uint32_t u = strtoul(nptr, endptr, 16);
> + if (u > USHRT_MAX) {
> + errno = ERANGE;
> + return USHRT_MAX;
> + } else {
> + return u;
> + }
> + } else {
> + return piglit_half_from_float(strtod_inf(nptr, endptr));
> + }
> +}
> +
> void piglit_escape_exit_key(unsigned char key, int x, int y);
>
> void piglit_gen_ortho_projection(double left, double right, double bottom,
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