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zink: fix legacy depth texture rewriting for single component reads

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if only a single component is read, this instruction can (and must) be
rewritten to use that component since depth sampling in vulkan is single-component

cc: mesa-stable

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25795>
This commit is contained in:
Mike Blumenkrantz
2023-10-18 12:21:02 -04:00
committed by Marge Bot
parent b3e864b326
commit 0d2923dfbb
1 changed files with 10 additions and 7 deletions
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17
src/gallium/drivers/zink/zink_compiler.c
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@@ -3358,18 +3358,21 @@ rewrite_tex_dest(nir_builder *b, nir_tex_instr *tex, nir_variable *var, struct z
return NULL;
nir_def *dest = &tex->def;
if (rewrite_depth && zs) {
if (nir_def_components_read(dest) & ~1) {
/* this needs recompiles */
if (b->shader->info.stage == MESA_SHADER_FRAGMENT)
flag_shadow_tex(var, zs);
else
mesa_loge("unhandled old-style shadow sampler in non-fragment stage!");
return NULL;
}
/* If only .x is used in the NIR, then it's effectively not a legacy depth
* sample anyway and we don't want to ask for shader recompiles. This is
* the typical path, since GL_DEPTH_TEXTURE_MODE defaults to either RED or
* LUMINANCE, so apps just use the first channel.
*/
if (nir_def_components_read(dest) & ~1) {
if (b->shader->info.stage == MESA_SHADER_FRAGMENT)
flag_shadow_tex(var, zs);
else
mesa_loge("unhandled old-style shadow sampler in non-fragment stage!");
}
return NULL;
tex->def.num_components = 1;
tex->is_new_style_shadow = true;
}
if (bit_size != dest_size) {
tex->def.bit_size = bit_size;