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render: add a Vulkan-only static sun receiver bias margin for toolchain rounding differences

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This commit is contained in:
mchughalex 2026-07-21 07:57:12 +01:00
parent fbcffc1445
commit b6d9442b45
2 changed files with 19 additions and 1 deletions
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10
src/skate3_native_scene.cpp
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@ -753,6 +753,16 @@ REXCVAR_DEFINE_DOUBLE(skate3_native_render_scene_shadow_static_bias, 0.08,
"static shadows visibly detach from their casters.")
.range(0.0, 0.5)
.lifecycle(rex::cvar::Lifecycle::kHotReload);
REXCVAR_DEFINE_DOUBLE(skate3_native_render_scene_shadow_static_bias_vk, 0.05,
"Skate 3",
"Additional static sun-shadow receiver bias in METERS "
"applied on the Vulkan backend only. The caster and "
"receiver depth terms compile through different "
"toolchains per backend; their rounding differences "
"left borderline texels flipping at map rebuilds on "
"Vulkan (triangular ground flicker while moving).")
.range(0.0, 0.5)
.lifecycle(rex::cvar::Lifecycle::kHotReload);
REXCVAR_DEFINE_BOOL(skate3_native_render_scene_char_shadow_exact, true,
"Skate 3",
"Characters sample the CSM atlas with the game's own math: "

10
src/skate3_native_scene_gpu.cpp
View file

@ -104,6 +104,7 @@ REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_pcss_max_m);
REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_pcss_min_texel);
REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_pcss_sun_deg);
REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_static_bias);
REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_static_bias_vk);
REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_static_radius);
REXCVAR_DECLARE(int32_t, skate3_native_render_scene_shadow_static_size);
REXCVAR_DECLARE(double, skate3_native_render_scene_shadow_static_strength);
@ -7548,8 +7549,15 @@ bool RenderScene(const NativeGuestOutputRenderContext& context, void* /*user_dat
float(REXCVAR_GET(
skate3_native_render_scene_shadow_pcss_min_texel)) /
float(std::max(1u, g_r.static_sun_size));
const float bias_m = float(
float bias_m = float(
REXCVAR_GET(skate3_native_render_scene_shadow_static_bias));
if (context.device->backend() == nrhi::Backend::kVulkan) {
// The two backends compile the caster/receiver depth math through
// different shader toolchains; their rounding differences leave
// borderline texels flipping at map rebuilds without this margin.
bias_m += float(
REXCVAR_GET(skate3_native_render_scene_shadow_static_bias_vk));
}
cb[160] = bias_m / g_r.nsm_depth_range; // base receiver bias
cb[161] = bias_m / g_r.nsm_depth_range; // slope-scaled term
cb[162] = 0.0f; // reserved (cascade ratios are shader constants)