Eevee: Add special shader for depth prespass.

This way we can extend it to output more data (like motion vectors).
Add a variation that uses clip distances.

1 files changed, 18 insertions, 0 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/prepass_vert.glsl b/source/blender/draw/engines/eevee/shaders/prepass_vert.glsl
new file mode 100644
index 00000000000..6f26a815736
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/prepass_vert.glsl
@@ -0,0 +1,18 @@
+
+uniform mat4 ModelViewProjectionMatrix;
+uniform mat4 ModelMatrix;
+#ifdef CLIP_PLANES
+uniform vec4 ClipPlanes[1];
+#endif
+
+in vec3 pos;
+
+void main()
+{
+	gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
+#ifdef CLIP_PLANES
+	vec4 worldPosition = (ModelMatrix * vec4(pos, 1.0));
+	gl_ClipDistance[0] = dot(worldPosition, ClipPlanes[0]);
+#endif
+	/* TODO motion vectors */
+}