From 7e98126419074cfd01ac838272f55a56ae73f3d9 Mon Sep 17 00:00:00 2001
From: hyzboy <hyzboy@gmail.com>
Date: Wed, 15 Jul 2020 18:45:20 +0800
Subject: [PATCH] add BackgroundGrid.frag

---
 shader/BackgroundGrid.frag | 40 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 shader/BackgroundGrid.frag

diff --git a/shader/BackgroundGrid.frag b/shader/BackgroundGrid.frag
new file mode 100644
index 0000000..578e4fd
--- /dev/null
+++ b/shader/BackgroundGrid.frag
@@ -0,0 +1,40 @@
+#version 450 core
+
+layout(location=0) out vec4 FragColor;
+
+layout(binding=1) uniform ColorMaterial
+{
+    vec4 color;
+} color_material;
+
+layout(binding=10) uniform WorldMatrix     // hgl/math/Math.h
+{
+    mat4 ortho;
+
+    mat4 projection;
+    mat4 inverse_projection;
+
+    mat4 modelview;
+    mat4 inverse_modelview;
+
+    mat4 mvp;
+    mat4 inverse_mvp;
+
+    vec4 view_pos;
+    vec2 canvas_resolution;
+    vec2 viewport_resolution;
+}fs_world;
+
+float bg_grid_texture(vec2 coord)
+{
+    vec2 index = ceil(coord * 0.1);
+
+    return 0.7 + 0.5*mod(index.x + index.y, 2.0);
+}
+
+void main()
+{
+    float strong=bg_grid_texture(gl_FragCoord.xy);
+
+    FragColor=vec4(color_material.color.rgb*strong,1.0);
+}