1 files changed, 46 insertions, 0 deletions
diff --git a/glow/src/shader/compatibility/quad.vert b/glow/src/shader/compatibility/quad.vert
new file mode 100644
index 00000000..0d02e9d0
--- /dev/null
+++ b/glow/src/shader/compatibility/quad.vert
@@ -0,0 +1,46 @@
+#version 100
+
+uniform mat4 u_Transform;
+uniform float u_Scale;
+
+attribute vec2 i_Pos;
+attribute vec2 i_Scale;
+attribute vec4 i_Color;
+attribute vec4 i_BorderColor;
+attribute float i_BorderRadius;
+attribute float i_BorderWidth;
+attribute vec2 q_Pos;
+
+varying vec4 v_Color;
+varying vec4 v_BorderColor;
+varying vec2 v_Pos;
+varying vec2 v_Scale;
+varying float v_BorderRadius;
+varying float v_BorderWidth;
+
+
+void main() {
+    vec2 p_Pos = i_Pos * u_Scale;
+    vec2 p_Scale = i_Scale  * u_Scale;
+
+    float i_BorderRadius = min(
+        i_BorderRadius,
+        min(i_Scale.x, i_Scale.y) / 2.0
+    );
+
+    mat4 i_Transform = mat4(
+        vec4(p_Scale.x + 1.0, 0.0, 0.0, 0.0),
+        vec4(0.0, p_Scale.y + 1.0, 0.0, 0.0),
+        vec4(0.0, 0.0, 1.0, 0.0),
+        vec4(p_Pos - vec2(0.5, 0.5), 0.0, 1.0)
+    );
+
+    v_Color = i_Color;
+    v_BorderColor = i_BorderColor;
+    v_Pos = p_Pos;
+    v_Scale = p_Scale;
+    v_BorderRadius = i_BorderRadius * u_Scale;
+    v_BorderWidth = i_BorderWidth * u_Scale;
+
+    gl_Position = u_Transform * i_Transform * vec4(q_Pos, 0.0, 1.0);
+}