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authorx2048 <codeforsmile@gmail.com>2021-10-31 19:18:30 +0100
committerGitHub <noreply@github.com>2021-10-31 19:18:30 +0100
commitcef016d393959e989df259aeacd055fc702a55ca (patch)
treefc1907616d74818da7a321567952db22eabd5641 /client
parent532d5b21fdff8bd8aa460b010ebd3bef1b9878dd (diff)
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Apply shadow only to the naturally lit part of the fragment color (#11722)
Fragment color for nodes is now calculated from: * Texture color, highlighted by artificial light if present (light color conveyed via vertex color). * Texture color highlighted by natural light (conveyed via vertex color) filtered by shadow. * Reflected day/moonlight filtered by shadow (color and intensity), assuming some portion of the light is directly reflected from the materials.
Diffstat (limited to 'client')
-rw-r--r--client/shaders/nodes_shader/opengl_fragment.glsl27
-rw-r--r--client/shaders/shadow_shaders/pass1_trans_fragment.glsl5
2 files changed, 22 insertions, 10 deletions
diff --git a/client/shaders/nodes_shader/opengl_fragment.glsl b/client/shaders/nodes_shader/opengl_fragment.glsl
index e21890710..b4a605b28 100644
--- a/client/shaders/nodes_shader/opengl_fragment.glsl
+++ b/client/shaders/nodes_shader/opengl_fragment.glsl
@@ -1,5 +1,6 @@
uniform sampler2D baseTexture;
+uniform vec3 dayLight;
uniform vec4 skyBgColor;
uniform float fogDistance;
uniform vec3 eyePosition;
@@ -497,23 +498,35 @@ void main(void)
shadow_int = visibility.r;
shadow_color = visibility.gba;
#else
- shadow_int = getShadow(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
+ if (cosLight > 0.0)
+ shadow_int = getShadow(ShadowMapSampler, posLightSpace.xy, posLightSpace.z);
+ else
+ shadow_int = 1.0;
#endif
shadow_int *= distance_rate;
- shadow_int *= 1.0 - nightRatio;
-
+ shadow_int = clamp(shadow_int, 0.0, 1.0);
}
+ // turns out that nightRatio falls off much faster than
+ // actual brightness of artificial light in relation to natual light.
+ // Power ratio was measured on torches in MTG (brightness = 14).
+ float adjusted_night_ratio = pow(nightRatio, 0.6);
+
if (f_normal_length != 0 && cosLight < 0.035) {
- shadow_int = max(shadow_int, min(clamp(1.0-nightRatio, 0.0, 1.0), 1 - clamp(cosLight, 0.0, 0.035)/0.035));
+ shadow_int = max(shadow_int, 1 - clamp(cosLight, 0.0, 0.035)/0.035);
}
- shadow_int = 1.0 - (shadow_int * f_adj_shadow_strength);
+ shadow_int *= f_adj_shadow_strength;
- // apply shadow (+color) as a factor to the material color
- col.rgb = col.rgb * (1.0 - (1.0 - shadow_color) * (1.0 - pow(shadow_int, 2.0)));
+ // calculate fragment color from components:
+ col.rgb =
+ adjusted_night_ratio * col.rgb + // artificial light
+ (1.0 - adjusted_night_ratio) * ( // natural light
+ col.rgb * (1.0 - shadow_int * (1.0 - shadow_color)) + // filtered texture color
+ dayLight * shadow_color * shadow_int); // reflected filtered sunlight/moonlight
// col.r = 0.5 * clamp(getPenumbraRadius(ShadowMapSampler, posLightSpace.xy, posLightSpace.z, 1.0) / SOFTSHADOWRADIUS, 0.0, 1.0) + 0.5 * col.r;
+ // col.r = adjusted_night_ratio; // debug night ratio adjustment
#endif
#if ENABLE_TONE_MAPPING
diff --git a/client/shaders/shadow_shaders/pass1_trans_fragment.glsl b/client/shaders/shadow_shaders/pass1_trans_fragment.glsl
index 032cd9379..b267c2214 100644
--- a/client/shaders/shadow_shaders/pass1_trans_fragment.glsl
+++ b/client/shaders/shadow_shaders/pass1_trans_fragment.glsl
@@ -33,9 +33,8 @@ void main()
//col.rgb = col.a == 1.0 ? vec3(1.0) : col.rgb;
#ifdef COLORED_SHADOWS
col.rgb *= varColor.rgb;
- // alpha 0.0 results in all-white, 0.5 means full color, 1.0 means all black
- // resulting color is used as a factor in the final shader
- float packedColor = packColor(mix(mix(vec3(1.0), col.rgb, 2.0 * clamp(col.a, 0.0, 0.5)), black, 2.0 * clamp(col.a - 0.5, 0.0, 0.5)));
+ // premultiply color alpha (see-through side)
+ float packedColor = packColor(col.rgb * (1.0 - col.a));
gl_FragColor = vec4(depth, packedColor, 0.0,1.0);
#else
gl_FragColor = vec4(depth, 0.0, 0.0, 1.0);