From df0f07fbca15c64034ff9f04ddf1eafc688be958 Mon Sep 17 00:00:00 2001
From: jgk <justin.g.kruger@gmail.com>
Date: Sun, 21 Feb 2021 11:27:27 +0100
Subject: [PATCH] Add background shaders

---
 shader/.background.geom.swp | Bin 0 -> 12288 bytes
 shader/background.frag      |  10 ++++++++++
 shader/background.geom      |  28 ++++++++++++++++++++++++++++
 shader/background.vert      |  11 +++++++++++
 4 files changed, 49 insertions(+)
 create mode 100644 shader/.background.geom.swp
 create mode 100644 shader/background.frag
 create mode 100644 shader/background.geom
 create mode 100644 shader/background.vert

diff --git a/shader/.background.geom.swp b/shader/.background.geom.swp
new file mode 100644
index 0000000000000000000000000000000000000000..a5aa6110e05752d39c96264859e44b9154b60e1a
GIT binary patch
literal 12288
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literal 0
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diff --git a/shader/background.frag b/shader/background.frag
new file mode 100644
index 000000000..fa8987fd8
--- /dev/null
+++ b/shader/background.frag
@@ -0,0 +1,10 @@
+#version 430 core
+in vec2 gTexPos;
+out vec4 fColor;
+
+uniform sampler2D aTexture;
+
+void main()
+{
+    fColor = texture(aTexture, gTexPos);
+}
diff --git a/shader/background.geom b/shader/background.geom
new file mode 100644
index 000000000..51e1fe969
--- /dev/null
+++ b/shader/background.geom
@@ -0,0 +1,28 @@
+#version 430 core
+layout (points) in;
+layout (triangle_strip, max_vertices = 4) out;
+in vec4 vParams [];
+in vec2 vWinSize [];
+out vec2 gTexPos;
+
+void main()
+{
+  vec2 cPos = vec2(vParams[0].x / 250 , vParams[0].y /250 );
+  float zoom = vParams[0].w;
+  float xoff = vWinSize[0].x / (500*zoom) ;
+  float yoff = vWinSize[0].y / (500*zoom) ;
+  gTexPos = vec2 (cPos.x + xoff,cPos.y + yoff);
+  gl_Position = vec4 (1,1,0.9,1);
+  EmitVertex();
+  gTexPos = vec2 (cPos.x + xoff,cPos.y - yoff);
+  gl_Position = vec4 (1,-1,0.9,1);
+  EmitVertex();
+  gTexPos = vec2 (cPos.x - xoff,cPos.y + yoff);
+  gl_Position = vec4 (-1,1,0.9,1);
+  EmitVertex();
+  gTexPos = vec2 (cPos.x - xoff,cPos.y - yoff);
+  gl_Position = vec4 (-1,-1,0.9,1);
+  EmitVertex();
+
+  EndPrimitive();
+}
diff --git a/shader/background.vert b/shader/background.vert
new file mode 100644
index 000000000..cd37b6199
--- /dev/null
+++ b/shader/background.vert
@@ -0,0 +1,11 @@
+#version 430 core
+layout (location = 0) in vec4 params;
+layout (location = 1) in vec2 winSize;
+out vec4 vParams;
+out vec2 vWinSize;
+void main()
+{
+  gl_Position = vec4(0,0,0,0);
+  vParams = params;
+  vWinSize = winSize;
+}