From 3cd092c41508dde2e6259f09df1736911a828548 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Nicolai=20H=C3=A4hnle?= Date: Wed, 18 Jan 2017 09:28:47 +0100 Subject: [PATCH] radeonsi: fix texture gather on stencil textures MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit At least on VI, texture gather doesn't work with a 24_8 data format, so use 8_8_8_8 and a modified swizzle instead. A bit of background: When creating a GL_STENCIL_INDEX8 texture, we select the X24S8 pipe format because we don't support stencil-only render targets properly. With mip-mapping this can lead to a setup where the tiling is incompatible with stencil texturing, and a flushed stencil texture is used. For the flushed stencil, a literal X24S8 is used because there were issues with an 8bpp DB->CB copy. Longer term, it would be good if we could get away from these workarounds, i.e. properly support an S8 format for stencil-only rendering and flushed stencil. Since stencil texturing is somewhat rare, it's not a high priority. Fixes GL45-CTS.texture_cube_map_array.sampling. Cc: 17.0 Reviewed-by: Marek Olšák Acked-by: Edward O'Callaghan --- src/gallium/drivers/radeonsi/si_state.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c index 0ec34f9..876cbf6 100644 --- a/src/gallium/drivers/radeonsi/si_state.c +++ b/src/gallium/drivers/radeonsi/si_state.c @@ -1365,11 +1365,17 @@ static uint32_t si_translate_texformat(struct pipe_screen *screen, case PIPE_FORMAT_Z16_UNORM: return V_008F14_IMG_DATA_FORMAT_16; case PIPE_FORMAT_X24S8_UINT: + case PIPE_FORMAT_S8X24_UINT: + /* + * Implemented as an 8_8_8_8 data format to fix texture + * gathers in stencil sampling. This affects at least + * GL45-CTS.texture_cube_map_array.sampling on VI. + */ + return V_008F14_IMG_DATA_FORMAT_8_8_8_8; case PIPE_FORMAT_Z24X8_UNORM: case PIPE_FORMAT_Z24_UNORM_S8_UINT: return V_008F14_IMG_DATA_FORMAT_8_24; case PIPE_FORMAT_X8Z24_UNORM: - case PIPE_FORMAT_S8X24_UINT: case PIPE_FORMAT_S8_UINT_Z24_UNORM: return V_008F14_IMG_DATA_FORMAT_24_8; case PIPE_FORMAT_S8_UINT: @@ -2796,14 +2802,22 @@ si_make_texture_descriptor(struct si_screen *screen, if (desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) { const unsigned char swizzle_xxxx[4] = {0, 0, 0, 0}; const unsigned char swizzle_yyyy[4] = {1, 1, 1, 1}; + const unsigned char swizzle_wwww[4] = {3, 3, 3, 3}; switch (pipe_format) { case PIPE_FORMAT_S8_UINT_Z24_UNORM: - case PIPE_FORMAT_X24S8_UINT: case PIPE_FORMAT_X32_S8X24_UINT: case PIPE_FORMAT_X8Z24_UNORM: util_format_compose_swizzles(swizzle_yyyy, state_swizzle, swizzle); break; + case PIPE_FORMAT_X24S8_UINT: + /* + * X24S8 is implemented as an 8_8_8_8 data format, to + * fix texture gathers. This affects at least + * GL45-CTS.texture_cube_map_array.sampling on VI. + */ + util_format_compose_swizzles(swizzle_wwww, state_swizzle, swizzle); + break; default: util_format_compose_swizzles(swizzle_xxxx, state_swizzle, swizzle); } -- 2.7.4