Copy shaders from WR repo.

resources/shaders/ps_gradient.vs.glsl

@@ -0,0 +1,45 @@
+#line 1
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define DIR_HORIZONTAL      uint(0)
+#define DIR_VERTICAL        uint(1)
+
+struct Gradient {
+	PrimitiveInfo info;
+    vec4 color0;
+    vec4 color1;
+    uvec4 dir;
+    Clip clip;
+};
+
+layout(std140) uniform Items {
+    Gradient gradients[WR_MAX_PRIM_ITEMS];
+};
+
+void main(void) {
+    Gradient gradient = gradients[gl_InstanceID];
+    VertexInfo vi = write_vertex(gradient.info);
+
+    vec2 f = (vi.local_clamped_pos - gradient.info.local_rect.xy) / gradient.info.local_rect.zw;
+
+    switch (gradient.dir.x) {
+        case DIR_HORIZONTAL:
+            vF = f.x;
+            break;
+        case DIR_VERTICAL:
+            vF = f.y;
+            break;
+    }
+
+    vClipRect = vec4(gradient.clip.rect.xy, gradient.clip.rect.xy + gradient.clip.rect.zw);
+    vClipRadius = vec4(gradient.clip.top_left.outer_inner_radius.x,
+                       gradient.clip.top_right.outer_inner_radius.x,
+                       gradient.clip.bottom_right.outer_inner_radius.x,
+                       gradient.clip.bottom_left.outer_inner_radius.x);
+    vPos = vi.local_clamped_pos;
+
+    vColor0 = gradient.color0;
+    vColor1 = gradient.color1;
+}