1 files changed, 27 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/object_motion_frag.glsl b/source/blender/draw/engines/eevee/shaders/object_motion_frag.glsl
new file mode 100644
index 00000000000..66b098ef6c5
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/object_motion_frag.glsl
@@ -0,0 +1,27 @@
+
+uniform mat4 prevViewProjMatrix;
+uniform mat4 currViewProjMatrix;
+uniform mat4 nextViewProjMatrix;
+
+in vec3 prevWorldPos;
+in vec3 currWorldPos;
+in vec3 nextWorldPos;
+
+out vec4 outData;
+
+void main()
+{
+  vec4 prev_wpos = prevViewProjMatrix * vec4(prevWorldPos, 1.0);
+  vec4 curr_wpos = currViewProjMatrix * vec4(currWorldPos, 1.0);
+  vec4 next_wpos = nextViewProjMatrix * vec4(nextWorldPos, 1.0);
+
+  vec2 prev_uv = (prev_wpos.xy / prev_wpos.w);
+  vec2 curr_uv = (curr_wpos.xy / curr_wpos.w);
+  vec2 next_uv = (next_wpos.xy / next_wpos.w);
+
+  outData.xy = prev_uv - curr_uv;
+  outData.zw = next_uv - curr_uv;
+
+  /* Encode to unsigned normalized 16bit texture. */
+  outData = outData * 0.5 + 0.5;
+}