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/wrap/compute_shader.cc | 51 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 src/shader/wrap/compute_shader.cc

(limited to 'src/shader/wrap/compute_shader.cc')

diff --git a/src/shader/wrap/compute_shader.cc b/src/shader/wrap/compute_shader.cc
new file mode 100644
index 0000000..c90c370
--- /dev/null
+++ b/src/shader/wrap/compute_shader.cc
@@ -0,0 +1,51 @@
+#include "compute_shader.h"
+
+#include "shader/util.h"
+
+ComputeShader::Guard::Guard(GLuint id):
+	_id(id) {
+	glUseProgram(_id);
+}
+
+ComputeShader::Guard::~Guard() {
+	glUseProgram(0);
+}
+
+ComputeShader::Guard ComputeShader::use() const {
+	return Guard(_id);
+}
+
+ComputeShader::ComputeShader(const std::string& src):
+	_id(glCreateProgram()) {
+	GLint shader = util::compileShader(src, GL_COMPUTE_SHADER);
+
+	if ( shader != -1 ) {
+		glAttachShader(_id, shader);
+		glLinkProgram(_id);
+		_good = true;
+	}
+}
+
+ComputeShader::~ComputeShader() {
+	glDeleteProgram(_id);
+}
+
+bool ComputeShader::isGood() const {
+	return _good;
+}
+
+GLuint ComputeShader::setUniform(const std::string& name, float x, float y) const {
+	GLuint id = util::getUniform(_id, name);
+	glUniform2f(id, x, y);
+	return id;
+}
+
+void ComputeShader::workOn(GLuint bufferA, GLuint bufferB, GLuint bufferC) const {
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, bufferA);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, bufferB);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, bufferC);
+}
+
+void ComputeShader::dispatch() const {
+	glDispatchCompute(128, 128, 1);
+}
-- 
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