cpu projection inverse fog

core/src/main/java/com/seibel/distanthorizons/core/render/renderer/shaders/FogShader.java

@@ -49,7 +49,7 @@ public class FogShader extends AbstractShaderRenderer
 		// because disabling fog can cause the GLSL to optimize out most (if not all) uniforms
 		
 		
-		this.gModelViewProjectionUniform = this.shader.tryGetUniformLocation("gMvmProj");
+		this.gModelViewProjectionUniform = this.shader.tryGetUniformLocation("gMvmProjInv");
 		this.gDepthMapUniform = this.shader.tryGetUniformLocation("gDepthMap");
 		
 		// Fog uniforms
@@ -115,13 +115,13 @@ public class FogShader extends AbstractShaderRenderer
 		
 		return fogColor;
 	}
+
 	private Color getSpecialFogColor(float partialTicks) { return MC_RENDER.getSpecialFogColor(partialTicks); }
 	
 	public void setModelViewProjectionMatrix(Mat4f combinedModelViewProjectionMatrix)
 	{
 		this.shader.bind();
-		this.shader.setUniform(this.gModelViewProjectionUniform, combinedModelViewProjectionMatrix);
+		this.shader.setUniform(this.gModelViewProjectionUniform, combinedModelViewProjectionMatrix.invert());
 		this.shader.unbind();
 	}
-	
 }

core/src/main/resources/shaders/fog/fog.frag

@@ -5,7 +5,7 @@ out vec4 fragColor;
 
 uniform sampler2D gDepthMap;
 // model view matrix and projection matrix
-uniform mat4 gMvmProj;
+uniform mat4 gMvmProjInv;
 
 uniform float fogScale;
 uniform float fogVerticalScale;
@@ -63,7 +63,7 @@ vec3 calcViewPosition(float fragmentDepth)
     ndc.xyz = ndc.xyz * 2.0 - 1.0;
 
     // TODO: This inverse() should be moved CPU side
-    vec4 eyeCoord = inverse(gMvmProj) * ndc;
+    vec4 eyeCoord = gMvmProjInv * ndc;
     return eyeCoord.xyz / eyeCoord.w;
 }