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Increase precision of SpotLight attenuation calculation to avoid driver bug on Intel devices

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This commit is contained in:
clayjohn 2025-09-09 13:05:17 -07:00
parent 2dd26a027a
commit 0576b12699
1 changed files with 6 additions and 6 deletions
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12
servers/rendering/renderer_rd/shaders/scene_forward_lights_inc.glsl
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@ -746,12 +746,12 @@ void light_process_spot(uint idx, vec3 vertex, hvec3 eye_vec, hvec3 normal, vec3
float light_length = length(light_rel_vec);
hvec3 light_rel_vec_norm = hvec3(light_rel_vec / light_length);
half spot_attenuation = get_omni_attenuation(light_length, spot_lights.data[idx].inv_radius, spot_lights.data[idx].attenuation);
hvec3 spot_dir = hvec3(spot_lights.data[idx].direction);
half cone_angle = half(spot_lights.data[idx].cone_angle);
half scos = max(dot(-light_rel_vec_norm, spot_dir), cone_angle);
vec3 spot_dir = spot_lights.data[idx].direction;
float cone_angle = spot_lights.data[idx].cone_angle;
float scos = max(dot(-vec3(light_rel_vec_norm), spot_dir), cone_angle);
// This conversion to a highp float is crucial to prevent light leaking due to precision errors.
float spot_rim = max(1e-4, float(half(1.0) - scos) / float(half(1.0) - cone_angle));
float spot_rim = max(1e-4, (1.0 - scos) / (1.0 - cone_angle));
spot_attenuation *= half(1.0 - pow(spot_rim, spot_lights.data[idx].cone_attenuation));
// Compute size.
@ -779,7 +779,7 @@ void light_process_spot(uint idx, vec3 vertex, hvec3 eye_vec, hvec3 normal, vec3
//soft shadow
//find blocker
float z_norm = dot(vec3(spot_dir), -light_rel_vec) * spot_lights.data[idx].inv_radius;
float z_norm = dot(spot_dir, -light_rel_vec) * spot_lights.data[idx].inv_radius;
vec2 shadow_uv = splane.xy * spot_lights.data[idx].atlas_rect.zw + spot_lights.data[idx].atlas_rect.xy;
@ -857,7 +857,7 @@ void light_process_spot(uint idx, vec3 vertex, hvec3 eye_vec, hvec3 normal, vec3
shadow_z = 2.0 * z_near * z_far / (z_far + z_near - shadow_z * (z_far - z_near));
//distance to light plane
float z = dot(vec3(spot_dir), -light_rel_vec);
float z = dot(spot_dir, -light_rel_vec);
transmittance_z = half(z - shadow_z);
}
#endif // !SHADOWS_DISABLED