Implement water simulation and surface shader for forest pond

[libs/gl.git] / demos / forestpond / data / water_variance_y.glsl

diff --git a/demos/forestpond/data/water_variance_y.glsl b/demos/forestpond/data/water_variance_y.glsl
new file mode 100644 (file)
index 0000000..bb4dd13
--- /dev/null
+++ b/demos/forestpond/data/water_variance_y.glsl
@@ -0,0 +1,14 @@
+#pragma MSP stage(compute)
+layout(local_size_x=8, local_size_y=8) in;
+
+uniform sampler2D variance_in;
+layout(r16f) uniform image2D variance_out;
+
+void main()
+{
+       ivec2 coord = ivec2(gl_GlobalInvocationID.xy)+ivec2(1, 4);
+       float variance = 0.0;
+       for(int i=-3; i<=3; ++i)
+               variance += texelFetch(variance_in, coord+ivec2(0, i), 0).x;
+       imageStore(variance_out, coord, vec4(variance/7.0, 0.0, 0.0, 0.0));
+}