1 files changed, 31 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/effect_mist_frag.glsl b/source/blender/draw/engines/eevee/shaders/effect_mist_frag.glsl
new file mode 100644
index 00000000000..fe38b2e9aac
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/effect_mist_frag.glsl
@@ -0,0 +1,31 @@
+/* Convert depth to Mist factor */
+uniform vec3 mistSettings;
+
+#define mistStart         mistSettings.x
+#define mistInvDistance   mistSettings.y
+#define mistFalloff       mistSettings.z
+
+out vec4 fragColor;
+
+void main()
+{
+	vec2 texel_size = 1.0 / vec2(textureSize(depthBuffer, 0)).xy;
+	vec2 uvs = gl_FragCoord.xy * texel_size;
+
+	float depth = textureLod(depthBuffer, uvs, 0.0).r;
+	vec3 co = get_view_space_from_depth(uvs, depth);
+
+	float zcor = (ProjectionMatrix[3][3] == 0.0) ? length(co) : -co.z;
+
+	/* bring depth into 0..1 range */
+	float mist = saturate((zcor - mistStart) * mistInvDistance);
+
+	/* falloff */
+	mist = pow(mist, mistFalloff);
+
+	fragColor = vec4(mist);
+
+	// if (mist > 0.999) fragColor = vec4(1.0);
+	// else if (mist > 0.0001) fragColor = vec4(0.5);
+	// else fragColor = vec4(0.0);
+}