X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=shaders%2Fgpos.fs;fp=shaders%2Fgpos.fs;h=b21f7a7ff6b2b0bfb59112dd3c2bf9a841a76b94;hb=ecc4dfbfb3adf91d2dfc03ba0ec9a821fcc2390c;hp=0000000000000000000000000000000000000000;hpb=3bb0287d544a4cb75de9afe2927ac8e946f3a18e;p=carveJwlIkooP6JGAAIwe30JlM.git

diff --git a/shaders/gpos.fs b/shaders/gpos.fs
new file mode 100644
index 0000000..b21f7a7
--- /dev/null
+++ b/shaders/gpos.fs
@@ -0,0 +1,30 @@
+out vec4 FragColor;
+
+uniform vec3 uCamera;
+
+in vec4 aColour;
+in vec2 aUv;
+in vec3 aNorm;
+in vec3 aCo;
+
+#include "common_world.glsl"
+
+// Water blending
+// ==============
+
+float water_depth( vec3 pos, vec3 halfview )
+{
+   vec3 pnorm = g_water_plane.xyz;
+   float pdist = g_water_plane.w;
+
+   float d = dot( pnorm, halfview );
+   float t = dot((pnorm*pdist - pos), pnorm) / d;
+   return t * g_water_fog;
+}
+
+void main()
+{
+   vec3 halfview = normalize( uCamera - aCo );
+   vec3 world_pos = vec3( aCo.y, aCo.x, aCo.z );
+   FragColor = vec4( world_pos, water_depth( aCo, halfview ) );
+}