render triangle tester

testbed/shaders/triangle.vert

@@ -0,0 +1,16 @@
+#version 450
+
+layout (location = 0) in vec2 position;
+layout (location = 1) in vec3 color;
+
+layout (location = 0) out vec3 fragColor;
+
+layout (push_constant) uniform Push {
+  mat4 transform;
+  vec4 color;
+} push;
+
+void main() {
+  gl_Position = vec4(push.transform * vec4(position, 0.0, 1.0));
+  fragColor = color;
+}