a

1 files changed, 20 insertions, 0 deletions

diff --git a/assets/shaders/2d_overlay.vsh b/assets/shaders/2d_overlay.vsh
new file mode 100644
index 0000000..512ef91
--- /dev/null
+++ b/assets/shaders/2d_overlay.vsh
@@ -0,0 +1,20 @@
+attribute vec4 in_position;
+attribute vec2 in_texcoord;
+attribute vec2 in_texcoord2;
+
+varying vec2 g_texcoord;
+varying vec2 g_texcoord2;
+uniform vec4 g_screenratio;
+
+void main() {
+  vec2 halfscreen = vec2( 1.0 / g_screenratio[0], 1.0 / g_screenratio[1] );
+
+  vec4 pos = in_position;
+  pos[0] -= halfscreen[0];
+  pos[1] -= halfscreen[1];
+  pos[1] *= -1.0;
+
+  gl_Position = ( pos ) * g_screenratio;
+  g_texcoord  = in_texcoord;
+  g_texcoord2 = in_texcoord2;
+}