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radv: ignore dual-source blending when blending isn't enabled for MRT0

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The Vulkan spec says:
    "VUID-vkCmdDraw-maxFragmentDualSrcAttachments-09239
     If blending is enabled for any attachment where either the source
     or destination blend factors for that attachment use the secondary
     color input, the maximum value of Location for any output attachment
     statically used in the Fragment Execution Model executed by this
     command must be less than maxFragmentDualSrcAttachments"

Which means it must be disabled.

Cc: mesa-stable
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/14190
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38107>
This commit is contained in:
Samuel Pitoiset 2025-10-28 12:32:38 +01:00 • committed by Marge Bot
parent 14667eef53
commit b2badb2b24
1 changed files with 9 additions and 2 deletions
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11
src/amd/vulkan/radv_cmd_buffer.c
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@ -6089,6 +6089,13 @@ radv_emit_tess_domain_origin_state(struct radv_cmd_buffer *cmd_buffer)
radeon_end();
}
static bool
radv_is_dual_src_enabled(const struct radv_dynamic_state *dynamic_state)
{
/* Dual-source blending must be ignored if blending isn't enabled for MRT0. */
return dynamic_state->blend_eq.mrt0_is_dual_src && !!(dynamic_state->color_blend_enable & 1u);
}
static struct radv_shader_part *
lookup_ps_epilog(struct radv_cmd_buffer *cmd_buffer)
{
@ -6122,7 +6129,7 @@ lookup_ps_epilog(struct radv_cmd_buffer *cmd_buffer)
state.color_write_mask = d->color_write_mask;
state.color_blend_enable = d->color_blend_enable;
state.mrt0_is_dual_src = d->blend_eq.mrt0_is_dual_src;
state.mrt0_is_dual_src = radv_is_dual_src_enabled(&cmd_buffer->state.dynamic);
if (d->vk.ms.alpha_to_coverage_enable) {
/* Select a color export format with alpha when alpha to coverage is enabled. */
@ -11683,7 +11690,7 @@ radv_emit_cb_render_state(struct radv_cmd_buffer *cmd_buffer)
const struct radv_rendering_state *render = &cmd_buffer->state.render;
const struct radv_dynamic_state *d = &cmd_buffer->state.dynamic;
unsigned cb_blend_control[MAX_RTS], sx_mrt_blend_opt[MAX_RTS];
const bool mrt0_is_dual_src = d->blend_eq.mrt0_is_dual_src;
const bool mrt0_is_dual_src = radv_is_dual_src_enabled(&cmd_buffer->state.dynamic);
uint32_t cb_color_control = 0;
const uint32_t cb_target_mask = d->color_write_enable & d->color_write_mask;