Mesa (master): r600/sfn: Add a forced output swizzle for depth write

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Module: Mesa
Branch: master
Commit: c18b1c6df5108112445c34b30680d8818202a4cb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c18b1c6df5108112445c34b30680d8818202a4cb

Author: Gert Wollny <gert.wollny at collabora.com>
Date:   Sat Jul 18 21:33:54 2020 +0200

r600/sfn: Add a forced output swizzle for depth write

This makes sure no components are written that shouldn't be written.

Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5963>

---

 src/gallium/drivers/r600/sfn/sfn_shader_fragment.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gallium/drivers/r600/sfn/sfn_shader_fragment.cpp b/src/gallium/drivers/r600/sfn/sfn_shader_fragment.cpp
index 850092ef843..978d96277d1 100644
--- a/src/gallium/drivers/r600/sfn/sfn_shader_fragment.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_shader_fragment.cpp
@@ -701,6 +701,10 @@ bool FragmentShaderFromNir::emit_export_pixel(const nir_variable *out_var, nir_i
    std::array<uint32_t,4> swizzle;
    unsigned writemask = nir_intrinsic_write_mask(instr);
    switch (out_var->data.location) {
+   case FRAG_RESULT_DEPTH:
+      writemask = 1;
+      swizzle = {0,7,7,7};
+      break;
    case FRAG_RESULT_STENCIL:
       writemask = 2;
       swizzle = {7,0,7,7};