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Use correct lightmap coefficients to ensure that the directional lightmap mode looks correct

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Also remove the metallic option from directional lightmap as it is guaranteed to return negative numbers in many cases

(cherry picked from commit f4ccba7508)
This commit is contained in:
clayjohn
2024-08-21 00:30:59 -07:00
committed by Rémi Verschelde
parent e79157af72
commit 0a1724f713
6 changed files with 48 additions and 44 deletions
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14
drivers/gles3/shaders/scene.glsl
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@@ -1738,16 +1738,10 @@ void main() {
vec3 n = normalize(lightmap_normal_xform * normal);
ambient_light += lm_light_l0 * 0.282095f;
ambient_light += lm_light_l1n1 * 0.32573 * n.y * lightmap_exposure_normalization;
ambient_light += lm_light_l1_0 * 0.32573 * n.z * lightmap_exposure_normalization;
ambient_light += lm_light_l1p1 * 0.32573 * n.x * lightmap_exposure_normalization;
if (metallic > 0.01) { // Since the more direct bounced light is lost, we can kind of fake it with this trick.
vec3 r = reflect(normalize(-vertex), normal);
specular_light += lm_light_l1n1 * 0.32573 * r.y * lightmap_exposure_normalization;
specular_light += lm_light_l1_0 * 0.32573 * r.z * lightmap_exposure_normalization;
specular_light += lm_light_l1p1 * 0.32573 * r.x * lightmap_exposure_normalization;
}
ambient_light += lm_light_l0 * lightmap_exposure_normalization;
ambient_light += lm_light_l1n1 * n.y * lightmap_exposure_normalization;
ambient_light += lm_light_l1_0 * n.z * lightmap_exposure_normalization;
ambient_light += lm_light_l1p1 * n.x * lightmap_exposure_normalization;
#else
ambient_light += textureLod(lightmap_textures, uvw, 0.0).rgb * lightmap_exposure_normalization;
#endif