first commit

shaderpacks/Reimagined - Low/shaders/lib/misc/reprojection.glsl

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+#if !defined REPROJECTION_FILE
+#define REPROJECTION_FILE
+
+// Previous frame reprojection from Chocapic13
+vec2 Reprojection(vec3 pos, vec3 cameraOffset) {
+    pos = pos * 2.0 - 1.0;
+
+    vec4 viewPosPrev = gbufferProjectionInverse * vec4(pos, 1.0);
+    viewPosPrev /= viewPosPrev.w;
+    viewPosPrev = gbufferModelViewInverse * viewPosPrev;
+
+    vec4 previousPosition = viewPosPrev + vec4(cameraOffset, 0.0);
+    previousPosition = gbufferPreviousModelView * previousPosition;
+    previousPosition = gbufferPreviousProjection * previousPosition;
+    return previousPosition.xy / previousPosition.w * 0.5 + 0.5;
+}
+
+vec3 FHalfReprojection(vec3 pos) {
+    pos = pos * 2.0 - 1.0;
+
+    vec4 viewPosPrev = gbufferProjectionInverse * vec4(pos, 1.0);
+    viewPosPrev /= viewPosPrev.w;
+    viewPosPrev = gbufferModelViewInverse * viewPosPrev;
+
+    return viewPosPrev.xyz;
+}
+
+vec2 SHalfReprojection(vec3 playerPos, vec3 cameraOffset) {
+    vec4 proPos = vec4(playerPos + cameraOffset, 1.0);
+    vec4 previousPosition = gbufferPreviousModelView * proPos;
+    previousPosition = gbufferPreviousProjection * previousPosition;
+    return previousPosition.xy / previousPosition.w * 0.5 + 0.5;
+}
+
+#endif