Split quad::Pipeline into core and compatibility

glow/src/shader/core/quad.vert

@@ -0,0 +1,52 @@
+#version 130
+
+uniform mat4 u_Transform;
+uniform float u_Scale;
+
+in vec2 i_Pos;
+in vec2 i_Scale;
+in vec4 i_Color;
+in vec4 i_BorderColor;
+in float i_BorderRadius;
+in float i_BorderWidth;
+
+out vec4 v_Color;
+out vec4 v_BorderColor;
+out vec2 v_Pos;
+out vec2 v_Scale;
+out float v_BorderRadius;
+out float v_BorderWidth;
+
+const vec2 positions[4] = vec2[](
+    vec2(0.0, 0.0),
+    vec2(0.0, 1.0),
+    vec2(1.0, 0.0),
+    vec2(1.0, 1.0)
+);
+
+void main() {
+    vec2 q_Pos = positions[gl_VertexID];
+    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);
+}