On 26 February 2013 12:39, Eric Anholt wrote:
> This will let the presentation of stencil work like presentation of
> depth.
> ---
> tests/texturing/depthstencil-render-miplevels.cpp | 13 +++--
> 1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/tests/texturing/depthstencil-render-miplevels.cpp
> b/tests/texturing/depthstencil-render-miplevels.cpp
> index 4fcc95a..b41fea8 100644
> --- a/tests/texturing/depthstencil-render-miplevels.cpp
> +++ b/tests/texturing/depthstencil-render-miplevels.cpp
> @@ -227,6 +227,14 @@ set_up_framebuffer_for_miplevel(int level)
> }
> }
>
> +uint8_t
> +stencil_for_level(int level)
> +{
> + int step = 254 / max_miplevel;
> +
> + return 1 + step * level;
> +}
> +
>
This doesn't yield results consistent with the depth values. I'd recommend
doing this instead:
uint8_t
stencil_for_level(int level)
{
float float_value = float(level + 1) / (max_miplevel + 1);
return (uint8_t) round(float_value * 255.0);
}
> /**
> * Using glClear, set the contents of the depth and stencil buffers
> * (if present) to a value that is unique to this miplevel.
> @@ -242,7 +250,7 @@ populate_miplevel(int level)
> clear_mask |= GL_DEPTH_BUFFER_BIT;
> }
> if (attach_stencil) {
> - glClearStencil(level + 1);
> + glClearStencil(stencil_for_level(level));
> clear_mask |= GL_STENCIL_BUFFER_BIT;
> }
>
> @@ -268,7 +276,8 @@ test_miplevel(int level)
>
> if (attach_stencil) {
> printf("Probing miplevel %d stencil\n", level);
> - pass = piglit_probe_rect_stencil(0, 0, dim, dim, level + 1)
> + pass = piglit_probe_rect_stencil(0, 0, dim, dim,
> +stencil_for_level(level))
> && pass;
> }
>
> --
> 1.7.10.4
>
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