cpu projection inverse

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

@@ -46,9 +46,9 @@ public class SSAOShader extends AbstractShaderRenderer
 				MC_RENDER.getTargetFrameBufferViewportWidth() / (float) MC_RENDER.getTargetFrameBufferViewportHeight(),
 				RenderUtil.getNearClipPlaneDistanceInBlocks(partialTicks),
 				(float) ((RenderUtil.getFarClipPlaneDistanceInBlocks() + LodUtil.REGION_WIDTH) * Math.sqrt(2)));
-		
-		
+
 		this.shader.setUniform(this.shader.getUniformLocation("gProj"), perspective);
+		this.shader.setUniform(this.shader.getUniformLocation("gProjInv"), perspective.invert());
 		this.shader.setUniform(this.shader.getUniformLocation("gSampleRad"), 3.0f);
 		this.shader.setUniform(this.shader.getUniformLocation("gFactor"), 0.8f);
 		this.shader.setUniform(this.shader.getUniformLocation("gPower"), 1.0f);

core/src/main/resources/shaders/ssao/ao.frag

@@ -9,6 +9,7 @@ uniform float gSampleRad;
 uniform float gFactor;
 uniform float gPower;
 uniform mat4 gProj;
+uniform mat4 gProjInv;
 
 const int MAX_KERNEL_SIZE = 32;
 const float INV_MAX_KERNEL_SIZE_F = 1.0 / float(MAX_KERNEL_SIZE);
@@ -20,8 +21,7 @@ vec3 calcViewPosition(vec2 coords) {
     vec4 ndc = vec4(coords.xy, fragmentDepth, 1.0);
     ndc.xyz = ndc.xyz * 2.0 - 1.0;
 
-    // TODO: This inverse() call should be moved CPU side
-    vec4 vs_pos = inverse(gProj) * ndc;
+    vec4 vs_pos = gProjInv * ndc;
     return vs_pos.xyz / vs_pos.w;
 }