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/util.cc | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/shader/util.cc

(limited to 'src/shader/util.cc')

diff --git a/src/shader/util.cc b/src/shader/util.cc
new file mode 100644
index 0000000..be59ac1
--- /dev/null
+++ b/src/shader/util.cc
@@ -0,0 +1,56 @@
+#include "util.h"
+
+#include <iostream>
+#include <vector>
+
+namespace util {
+
+GLint getUniform(GLuint program, const std::string& name) {
+	const GLint uniform = glGetUniformLocation(program, name.c_str());
+
+	if ( uniform == -1 ) {
+		std::cerr << "Could not bind uniform " << name << std::endl;
+		return -1;
+	}
+
+	return uniform;
+}
+
+GLint compileShader(const std::string& source, GLenum type) {
+	GLint shader = glCreateShader(type);
+
+	if ( !shader ) {
+		std::cerr << "Cannot create a shader of type " << type << std::endl;
+		return -1;
+	}
+
+	const char* source_data = source.c_str();
+	const int source_length = source.size();
+
+	glShaderSource(shader, 1, &source_data, &source_length);
+	glCompileShader(shader);
+
+	GLint compiled;
+	glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
+
+	if ( !compiled ) {
+		std::cerr << "Cannot compile shader" << std::endl;
+
+		GLint maxLength = 0;
+		glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &maxLength);
+
+		std::vector<GLchar> errorLog(maxLength);
+		glGetShaderInfoLog(shader, maxLength, &maxLength, &errorLog[0]);
+
+		for( auto c : errorLog ) {
+			std::cerr << c;
+		}
+		std::cerr << std::endl;
+
+		return -1;
+	}
+
+	return shader;
+}
+
+}
-- 
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