Add background shaders

2021-02-21 11:27:27 +01:00
parent 2c3d8d5b01
commit df0f07fbca
4 changed files with 49 additions and 0 deletions
@@ -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();
+}