Mesa (main): panfrost: Fix gl_FragColor lowering

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Module: Mesa
Branch: main
Commit: e0335ad8881d3feeb89b571b1047bb8799ae23b7
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=e0335ad8881d3feeb89b571b1047bb8799ae23b7

Author: Alyssa Rosenzweig <alyssa at collabora.com>
Date:   Sat Oct 16 16:14:00 2021 -0400

panfrost: Fix gl_FragColor lowering

The gl_FragColor lowering in the fragment shader depends on the number
of render targets, which can change every set_framebuffer_state.
set_framebuffer_state thus needs to force a rebind of the fragment
shader.

Fixes a regression in Piglit fbo-drawbuffers-none gl_FragColor -auto
-fbo from enabling AFBC on Mali G52.

Fixes: 28ac4d1e005 ("panfrost: Call nir_lower_fragcolor based on key")
Signed-off-by: Alyssa Rosenzweig <alyssa at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13498>

---

 src/gallium/drivers/panfrost/pan_context.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/panfrost/pan_context.c b/src/gallium/drivers/panfrost/pan_context.c
index 51d4530c9ae..69bbc43f826 100644
--- a/src/gallium/drivers/panfrost/pan_context.c
+++ b/src/gallium/drivers/panfrost/pan_context.c
@@ -688,11 +688,10 @@ panfrost_set_framebuffer_state(struct pipe_context *pctx,
         }
 
         /* We may need to generate a new variant if the fragment shader is
-         * keyed to the framebuffer format (due to EXT_framebuffer_fetch) */
+         * keyed to the framebuffer format or render target count */
         struct panfrost_shader_variants *fs = ctx->shader[PIPE_SHADER_FRAGMENT];
 
-        if (fs && fs->variant_count &&
-            fs->variants[fs->active_variant].info.fs.outputs_read)
+        if (fs && fs->variant_count)
                 ctx->base.bind_fs_state(&ctx->base, fs);
 }