readd braid-rewind with syntax fix

motionblur/braid-rewind.slangp

@@ -0,0 +1,5 @@
+shaders = 1
+
+shader0 = shaders/braid-rewind.slang
+filter_linear0 = false
+scale_type0 = source

motionblur/shaders/braid-rewind.slang

@@ -0,0 +1,66 @@
+#version 450
+/*
+    Braid Rewind
+    Authors: hunterk, cgwg
+ 
+    This program is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the Free
+    Software Foundation; either version 2 of the License, or (at your option)
+    any later version.
+*/
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+    mat4 MVP;
+    vec4 OutputSize;
+    vec4 OriginalSize;
+    vec4 SourceSize;
+    int FrameDirection;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+    gl_Position = global.MVP * Position;
+    vTexCoord   = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+layout(set = 0, binding = 3) uniform sampler2D OriginalHistory1;
+layout(set = 0, binding = 4) uniform sampler2D OriginalHistory2;
+layout(set = 0, binding = 5) uniform sampler2D OriginalHistory3;
+layout(set = 0, binding = 6) uniform sampler2D OriginalHistory4;
+layout(set = 0, binding = 7) uniform sampler2D OriginalHistory5;
+layout(set = 0, binding = 8) uniform sampler2D OriginalHistory6;
+layout(set = 0, binding = 9) uniform sampler2D OriginalHistory7;
+
+void main()
+{
+    vec4 current = texture(Source, vTexCoord);
+
+    vec4 color = 
+        texture(OriginalHistory7, vTexCoord) +
+        texture(OriginalHistory6, vTexCoord) +
+        texture(OriginalHistory5, vTexCoord) +
+        texture(OriginalHistory4, vTexCoord) +
+        texture(OriginalHistory3, vTexCoord) +
+        texture(OriginalHistory2, vTexCoord) +
+        texture(OriginalHistory1, vTexCoord) +
+        current;
+
+    vec4 sepia = vec4(1.0, 0.8, 0.6, 1.0); 
+
+    if (global.FrameDirection < 0)
+    {
+        current = ((current + (color * 0.142857142857143)) * 0.5) * sepia;
+    }
+
+    FragColor = current;
+}