From 44f5ac32a68a617f93704d44c4339f7db13b323e Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Sat, 15 Dec 2018 23:09:32 +0100
Subject: Hacky D2Q9 BGK LBM on GPU using GLSL compute shaders

Improvised on top of computicles's scaffolding.

Works in a world where _works_ is defined as "displays stuff on screen that invokes thoughts of fluid movement".
---
 src/shader/code/stream.glsl | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/shader/code/stream.glsl

(limited to 'src/shader/code/stream.glsl')

diff --git a/src/shader/code/stream.glsl b/src/shader/code/stream.glsl
new file mode 100644
index 0000000..7dd5ba8
--- /dev/null
+++ b/src/shader/code/stream.glsl
@@ -0,0 +1,30 @@
+static const std::string STREAM_SHADER_CODE = R"(
+#version 430
+
+layout (local_size_x = 1, local_size_y = 1) in;
+layout (std430, binding=1) buffer bufferCollide{ float collideCells[]; };
+layout (std430, binding=2) buffer bufferStream{  float streamCells[]; };
+
+float get(uint x, uint y, int i, int j) {
+	return collideCells[9*128*y + 9*x + (i+1)*3 + j+1];
+}
+
+void set(uint x, uint y, int i, int j, float v) {
+	streamCells[9*128*y + 9*x + (i+1)*3 + j+1] = v;
+}
+
+void main() {
+	const uint x = gl_GlobalInvocationID.x;
+	const uint y = gl_GlobalInvocationID.y;
+
+	if ( x != 0 && x != 128-1 && y != 0 && y != 128-1 ) {
+		for ( int i = -1; i <= 1; ++i ) {
+			for ( int j = -1; j <= 1; ++j ) {
+				set(x+i,y+j,i,j, get(x,y,i,j));
+			}
+		}
+	} else {
+
+	}
+}
+)";
-- 
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