i965: Disable dual source blending when shader doesn't support it on gen8+
Dual source blending behaviour is undefined when shader doesn't have second color output, dismissing fragment in such situation leads to a hang on gen8+ if depth test in enabled. Since blending cannot be gracefully fixed in such case and the result is undefined - blending is simply disabled. v2 (Kenneth Graunke): - Listen to BRW_NEW_FS_PROG_DATA in 3DSTATE_PS_BLEND - Also whack BLEND_STATE[] to keep the two in sync, since we're not sure exactly which copy of the redundant info the hardware will use. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107088 Signed-off-by: Danylo Piliaiev <danylo.piliaiev@globallogic.com> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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@ -3051,7 +3051,26 @@ set_blend_entry_bits(struct brw_context *brw, BLEND_ENTRY_GENXML *entry, int i,
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dstA = fix_dual_blend_alpha_to_one(dstA);
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}
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entry->ColorBufferBlendEnable = true;
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/* BRW_NEW_FS_PROG_DATA */
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const struct brw_wm_prog_data *wm_prog_data =
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brw_wm_prog_data(brw->wm.base.prog_data);
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/* The Dual Source Blending documentation says:
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*
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* "If SRC1 is included in a src/dst blend factor and
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* a DualSource RT Write message is not used, results
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* are UNDEFINED. (This reflects the same restriction in DX APIs,
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* where undefined results are produced if “o1” is not written
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* by a PS – there are no default values defined).
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* If SRC1 is not included in a src/dst blend factor,
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* dual source blending must be disabled."
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*
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* There is no way to gracefully fix this undefined situation
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* so we just disable the blending to prevent possible issues.
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*/
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entry->ColorBufferBlendEnable =
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!ctx->Color.Blend[0]._UsesDualSrc || wm_prog_data->dual_src_blend;
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entry->DestinationBlendFactor = blend_factor(dstRGB);
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entry->SourceBlendFactor = blend_factor(srcRGB);
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entry->DestinationAlphaBlendFactor = blend_factor(dstA);
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@ -3197,6 +3216,7 @@ static const struct brw_tracked_state genX(blend_state) = {
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_NEW_MULTISAMPLE,
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.brw = BRW_NEW_BATCH |
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BRW_NEW_BLORP |
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BRW_NEW_FS_PROG_DATA |
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BRW_NEW_STATE_BASE_ADDRESS,
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},
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.emit = genX(upload_blend_state),
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@ -4829,7 +4849,25 @@ genX(upload_ps_blend)(struct brw_context *brw)
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dstA = fix_dual_blend_alpha_to_one(dstA);
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}
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pb.ColorBufferBlendEnable = true;
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/* BRW_NEW_FS_PROG_DATA */
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const struct brw_wm_prog_data *wm_prog_data =
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brw_wm_prog_data(brw->wm.base.prog_data);
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/* The Dual Source Blending documentation says:
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*
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* "If SRC1 is included in a src/dst blend factor and
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* a DualSource RT Write message is not used, results
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* are UNDEFINED. (This reflects the same restriction in DX APIs,
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* where undefined results are produced if “o1” is not written
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* by a PS – there are no default values defined).
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* If SRC1 is not included in a src/dst blend factor,
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* dual source blending must be disabled."
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*
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* There is no way to gracefully fix this undefined situation
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* so we just disable the blending to prevent possible issues.
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*/
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pb.ColorBufferBlendEnable =
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!color->Blend[0]._UsesDualSrc || wm_prog_data->dual_src_blend;
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pb.SourceAlphaBlendFactor = brw_translate_blend_factor(srcA);
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pb.DestinationAlphaBlendFactor = brw_translate_blend_factor(dstA);
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pb.SourceBlendFactor = brw_translate_blend_factor(srcRGB);
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@ -4848,7 +4886,8 @@ static const struct brw_tracked_state genX(ps_blend) = {
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_NEW_MULTISAMPLE,
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.brw = BRW_NEW_BLORP |
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BRW_NEW_CONTEXT |
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BRW_NEW_FRAGMENT_PROGRAM,
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BRW_NEW_FRAGMENT_PROGRAM |
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BRW_NEW_FS_PROG_DATA,
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},
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.emit = genX(upload_ps_blend)
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};
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