From f6c0498c9728a286c13980ed3b60763d02e1b3a0 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Sat, 11 May 2019 12:08:45 +0800
Subject: *misc

---
 .../graphics/shaders/image_slice.shader.h          | 64 ++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 source/Asura.Editor/graphics/shaders/image_slice.shader.h

(limited to 'source/Asura.Editor/graphics/shaders/image_slice.shader.h')

diff --git a/source/Asura.Editor/graphics/shaders/image_slice.shader.h b/source/Asura.Editor/graphics/shaders/image_slice.shader.h
new file mode 100644
index 0000000..58be2b1
--- /dev/null
+++ b/source/Asura.Editor/graphics/shaders/image_slice.shader.h
@@ -0,0 +1,64 @@
+#ifndef __ASURA_EDITOR_SHADER_H__
+#include "../shader.h"
+#endif
+
+// 九宫格分割的图片
+static AsuraEditor::Graphics::ShaderProgram image_slice_shader =
+{
+R"(
+in vec2 _position; 
+
+uniform _mvp_matrix;
+
+out vec2 offset; // top-left
+
+void main() 
+{
+	gl_Position = _mvp_matrix * vec4(_position, 0, 1);
+	offset = _position - vec2(0.5, 0.5);
+}
+
+)",
+
+R"(
+in vec2 offset;
+
+uniform vec4 _sliceline; // l, r, t, b
+uniform vec2 _texsize; // w0, h0 in pixel
+uniform sampler2D _maintex;
+uniform vec2 _area; // w, h
+// 如果在(a, b]范围内，返回1，否则返回0
+int factor(float v, float a, float b)
+{
+	return clamp(sign(v-a), 0, 1) * step(-b, -v);
+}
+
+void main() 
+{
+	float x = offset.x; 
+	float y = offset.y;
+	float l = _sliceline.x; 
+	float r = _sliceline.y; 
+	float t = _sliceline.z; 
+	float b = _sliceline.w; 
+	float w0 = _texsize.x;
+	float h0 = _texsize.y;
+	float w = _area.x;
+	float h = _area.y;
+
+	vec2 uv = vec2(0, 0);
+
+	//uv.x *= 0; // x = 0
+	uv.x *= factor(x, 0, l) * x / w0; // 0<x<=l
+	uv.x *= factor(x, l, w-r) * (l/w0 + (x-l)/(w-l-r) * (w0-l-r) / w0); // l<x<=w-r
+	uv.x *= factor(x, w-r, w) * (1 - (w-x)/w0); // w-r<x<=w
+	
+	//uv.y *= 0; // y = 0
+		
+
+	gl_FragColor = texture2D(_maintex, uv);
+	
+}
+
+)"
+};
-- 
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