diff --git a/screenshot/DrawText.png b/screenshot/DrawText.png
new file mode 100644
index 0000000..1390bb7
Binary files /dev/null and b/screenshot/DrawText.png differ
diff --git a/shader/FlatAlphaTexture.frag b/shader/FlatAlphaTexture.frag
new file mode 100644
index 0000000..9459860
--- /dev/null
+++ b/shader/FlatAlphaTexture.frag
@@ -0,0 +1,18 @@
+#version 450 core
+
+layout(binding = 2) uniform sampler2D tex;
+
+layout(location = 0) in vec2 FragmentTexCoord;
+layout(location = 0) out vec4 FragColor;
+
+layout(binding = 1) uniform ColorMaterial
+{
+    vec4 color;
+} color_material;
+
+void main()
+{
+    float alpha=texture(tex,FragmentTexCoord).r;
+
+    FragColor=vec4(color_material.color.rgb,color_material.color.a*alpha);
+}
diff --git a/shader/FlatLumTexture.frag b/shader/FlatLumTexture.frag
new file mode 100644
index 0000000..4c5117d
--- /dev/null
+++ b/shader/FlatLumTexture.frag
@@ -0,0 +1,18 @@
+#version 450 core
+
+layout(binding = 2) uniform sampler2D tex;
+
+layout(location = 0) in vec2 FragmentTexCoord;
+layout(location = 0) out vec4 FragColor;
+
+layout(binding = 1) uniform ColorMaterial
+{
+    vec4 color;
+} color_material;
+
+void main()
+{
+    float lum=texture(tex,FragmentTexCoord).r;
+
+    FragColor=vec4(color_material.color.rgb*lum,color_material.color.a);
+}