Reenable fog but add option to disable it

1 files changed, 40 insertions, 0 deletions

diff --git a/src/main/resources/shaders/chunk_fog.frag b/src/main/resources/shaders/chunk_fog.frag
new file mode 100644
index 0000000..ab188ab
--- /dev/null
+++ b/src/main/resources/shaders/chunk_fog.frag
@@ -0,0 +1,40 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoord;
+in vec2 BTexCoord;
+in vec4 DaColor;
+in vec4 Viewport;
+in mat4 ProjInv;
+in vec4 FogColor;
+in vec2 FogStartEnd;
+
+uniform sampler2D atlas;
+uniform sampler2D lightTex;
+
+void main()
+{	
+	vec4 texColor = texture(atlas, TexCoord);
+	vec4 colorMult = DaColor/256.0;
+	
+	vec4 lightyColor = texture(lightTex, (BTexCoord + 8.0) / 256.0);
+	
+	vec4 rasterColor = ((texColor * colorMult) * lightyColor);
+	
+	float s = FogStartEnd.x;
+	float e = FogStartEnd.y;
+	
+	vec4 ndcPos;
+	ndcPos.xy = ((2.0 * gl_FragCoord.xy) - (2.0 * Viewport.xy)) / (Viewport.zw) - 1;
+	ndcPos.z = (2.0 * gl_FragCoord.z - gl_DepthRange.near - gl_DepthRange.far) /
+		(gl_DepthRange.far - gl_DepthRange.near);
+	ndcPos.w = 1.0;
+
+	vec4 clipPos = ndcPos / gl_FragCoord.w;
+	vec4 eyePos = ProjInv * clipPos;
+	
+	float z = length(eyePos);
+	float f = (e - z) / (e - s);
+	f = clamp(f, 0, 1);
+	FragColor = mix(FogColor, rasterColor, f);
+}