From b1a90a7f915e7779aad975a70b503788b0a1b228 Mon Sep 17 00:00:00 2001
From: raysan5 <raysan5@gmail.com>
Date: Wed, 2 Sep 2015 02:44:16 +0200
Subject: Added some useful postprocessing shaders

Shaders come in two flavours:
- shaders/gl330: OpenGL 3.3+ (Windows, Linux, OSX)
- shaders/gles100:  OpenGL ES 2.0 (Android, RPI, HTML5)
---
 shaders/gl330/cross_stitching.fs | 54 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 shaders/gl330/cross_stitching.fs

(limited to 'shaders/gl330/cross_stitching.fs')

diff --git a/shaders/gl330/cross_stitching.fs b/shaders/gl330/cross_stitching.fs
new file mode 100644
index 00000000..041bf1dc
--- /dev/null
+++ b/shaders/gl330/cross_stitching.fs
@@ -0,0 +1,54 @@
+#version 330
+
+in vec2 fragTexCoord;
+
+out vec4 fragColor;
+
+uniform sampler2D texture0;
+uniform vec4 tintColor;
+
+// NOTE: Add here your custom variables
+
+const float renderWidth = 1280;
+const float renderHeight = 720;
+
+float stitchingSize = 6.0f;
+
+uniform int invert = 0;
+
+vec4 PostFX(sampler2D tex, vec2 uv)
+{
+    vec4 c = vec4(0.0);
+    float size = stitchingSize;
+    vec2 cPos = uv * vec2(renderWidth, renderHeight);
+    vec2 tlPos = floor(cPos / vec2(size, size));
+    tlPos *= size;
+
+    int remX = int(mod(cPos.x, size));
+    int remY = int(mod(cPos.y, size));
+
+    if (remX == 0 && remY == 0) tlPos = cPos;
+
+    vec2 blPos = tlPos;
+    blPos.y += (size - 1.0);
+
+    if ((remX == remY) || (((int(cPos.x) - int(blPos.x)) == (int(blPos.y) - int(cPos.y)))))
+    {
+        if (invert == 1) c = vec4(0.2, 0.15, 0.05, 1.0);
+        else c = texture2D(tex, tlPos * vec2(1.0/renderWidth, 1.0/renderHeight)) * 1.4;
+    }
+    else
+    {
+        if (invert == 1) c = texture2D(tex, tlPos * vec2(1.0/renderWidth, 1.0/renderHeight)) * 1.4;
+        else c = vec4(0.0, 0.0, 0.0, 1.0);
+    }
+    
+    return c;
+}
+
+void main(void)
+{
+    vec3 tc = PostFX(texture0, fragTexCoord).rgb;
+
+    fragColor = vec4(tc, 1.0);
+}
\ No newline at end of file
-- 
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