This actually works...

Vexatos · Vexatos · commit b60a6dcb4e4d · 2016-03-10T01:02:34.000+01:00
diff --git a/src/main/resources/assets/minecraft/shaders/post/computronics_invert.json b/src/main/resources/assets/minecraft/shaders/post/computronics_invert.json
@@ -0,0 +1,17 @@
+{
+    "targets": [
+        "swap"
+    ],
+    "passes": [
+        {
+            "name": "computronics_invert",
+            "intarget": "minecraft:main",
+            "outtarget": "swap"
+        },
+        {
+            "name": "blit",
+            "intarget": "swap",
+            "outtarget": "minecraft:main"
+        }
+    ]
+}
diff --git a/src/main/resources/assets/minecraft/shaders/post/computronics_invert_x.json b/src/main/resources/assets/minecraft/shaders/post/computronics_invert_x.json
@@ -0,0 +1,17 @@
+{
+    "targets": [
+        "swap"
+    ],
+    "passes": [
+        {
+            "name": "computronics_invert_x",
+            "intarget": "minecraft:main",
+            "outtarget": "swap"
+        },
+        {
+            "name": "blit",
+            "intarget": "swap",
+            "outtarget": "minecraft:main"
+        }
+    ]
+}
diff --git a/src/main/resources/assets/minecraft/shaders/post/computronics_invert_y.json b/src/main/resources/assets/minecraft/shaders/post/computronics_invert_y.json
@@ -0,0 +1,17 @@
+{
+    "targets": [
+        "swap"
+    ],
+    "passes": [
+        {
+            "name": "computronics_invert_y",
+            "intarget": "minecraft:main",
+            "outtarget": "swap"
+        },
+        {
+            "name": "blit",
+            "intarget": "swap",
+            "outtarget": "minecraft:main"
+        }
+    ]
+}
diff --git a/src/main/resources/assets/minecraft/shaders/program/computronics_invert.json b/src/main/resources/assets/minecraft/shaders/program/computronics_invert.json
@@ -0,0 +1,20 @@
+{
+    "blend": {
+        "func": "add",
+        "srcrgb": "one",
+        "dstrgb": "zero"
+    },
+    "vertex": "computronics_invert",
+    "fragment": "blit",
+    "attributes": [ "Position" ],
+    "samplers": [
+        { "name": "DiffuseSampler" }
+    ],
+    "uniforms": [
+        { "name": "ProjMat",    "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+        { "name": "InSize",     "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "OutSize",    "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "ScreenSize", "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "Flip",       "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] }
+    ]
+}
diff --git a/src/main/resources/assets/minecraft/shaders/program/computronics_invert.vsh b/src/main/resources/assets/minecraft/shaders/program/computronics_invert.vsh
@@ -0,0 +1,31 @@
+#version 120
+
+attribute vec4 Position;
+
+uniform mat4 ProjMat;
+uniform vec2 InSize;
+uniform vec2 OutSize;
+uniform vec2 ScreenSize;
+uniform vec2 Flip;
+
+varying vec2 texCoord;
+
+void main(){
+    vec4 outPos = ProjMat * vec4(Position.xy, 0.0, 1.0);
+    if(Flip.x > 0) {
+    	outPos.x *= -1.0 * Flip.x;
+    	outPos.y *= -1.0 * Flip.x;
+    }
+    gl_Position = vec4(outPos.xy, 0.2, 1.0);
+    vec2 inOutRatio = OutSize / InSize;
+    vec2 inScreenRatio = ScreenSize / InSize;
+    texCoord = Position.xy / OutSize;
+    if(Flip.y > 0 && Flip.x > 0) {
+    	texCoord.y = 1.0 - texCoord.y;
+    }
+    texCoord.x = texCoord.x * inOutRatio.x;
+    texCoord.y = texCoord.y * inOutRatio.y;
+    if(Flip.y > 0 && Flip.x <= 0){
+    	texCoord.y -= 1.0 - inScreenRatio.y;
+    }
+}
diff --git a/src/main/resources/assets/minecraft/shaders/program/computronics_invert_x.json b/src/main/resources/assets/minecraft/shaders/program/computronics_invert_x.json
@@ -0,0 +1,20 @@
+{
+    "blend": {
+        "func": "add",
+        "srcrgb": "one",
+        "dstrgb": "zero"
+    },
+    "vertex": "computronics_invert",
+    "fragment": "blit",
+    "attributes": [ "Position" ],
+    "samplers": [
+        { "name": "DiffuseSampler" }
+    ],
+    "uniforms": [
+        { "name": "ProjMat",    "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+        { "name": "InSize",     "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "OutSize",    "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "ScreenSize", "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "Flip",       "type": "float",     "count": 2,  "values": [ 1.0,-1.0 ] }
+    ]
+}
diff --git a/src/main/resources/assets/minecraft/shaders/program/computronics_invert_y.json b/src/main/resources/assets/minecraft/shaders/program/computronics_invert_y.json
@@ -0,0 +1,20 @@
+{
+    "blend": {
+        "func": "add",
+        "srcrgb": "one",
+        "dstrgb": "zero"
+    },
+    "vertex": "computronics_invert",
+    "fragment": "blit",
+    "attributes": [ "Position" ],
+    "samplers": [
+        { "name": "DiffuseSampler" }
+    ],
+    "uniforms": [
+        { "name": "ProjMat",    "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+        { "name": "InSize",     "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "OutSize",    "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "ScreenSize", "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] },
+        { "name": "Flip",       "type": "float",     "count": 2,  "values": [-1.0, 1.0 ] }
+    ]
+}
