Improvise interactive wall drawing

Internal wall cells need to be disabled to prevent delayed propagation
of the reflected populations.

This is just quickly thrown together - both the visual drawing and the backend's
material handling remain to be improved.

2 files changed, 69 insertions, 0 deletions

diff --git a/src/buffer/vertex/material_buffer.cc b/src/buffer/vertex/material_buffer.cc
new file mode 100644
index 0000000..82ccea2
--- /dev/null
+++ b/src/buffer/vertex/material_buffer.cc
@@ -0,0 +1,51 @@
+#include "material_buffer.h"
+
+#include <vector>
+
+MaterialBuffer::MaterialBuffer(GLuint nX, GLuint nY):
+	_nX(nX), _nY(nY) {
+	glGenVertexArrays(1, &_array);
+	glGenBuffers(1, &_buffer);
+
+	glBindVertexArray(_array);
+	glBindBuffer(GL_ARRAY_BUFFER, _buffer);
+
+	std::vector<GLint> data(nX*nY, GLint{1});
+
+	for ( int x = 0; x < nX; ++x ) {
+		data[     0*nX + x] = 0;
+		data[(nY-1)*nX + x] = 0;
+	}
+	for ( int y = 0; y < nY; ++y ) {
+		data[y*nX +    0] = 0;
+		data[y*nX + nX-1] = 0;
+	}
+
+	for ( int x = 1; x < nX-1; ++x ) {
+		data[     1*nX + x] = 2;
+		data[(nY-2)*nX + x] = 2;
+	}
+	for ( int y = 1; y < nY-1; ++y ) {
+		data[y*nX +    1] = 2;
+		data[y*nX + nX-2] = 2;
+	}
+
+	glBufferData(
+		GL_ARRAY_BUFFER,
+		data.size() * sizeof(GLint),
+		data.data(),
+		GL_STATIC_DRAW
+	);
+
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 1, GL_INT, GL_FALSE, 0, nullptr);
+}
+
+MaterialBuffer::~MaterialBuffer() {
+	glDeleteBuffers(1, &_buffer);
+	glDeleteVertexArrays(1, &_array);
+}
+
+GLuint MaterialBuffer::getBuffer() const {
+	return _buffer;
+}
diff --git a/src/buffer/vertex/material_buffer.h b/src/buffer/vertex/material_buffer.h
new file mode 100644
index 0000000..eccf008
--- /dev/null
+++ b/src/buffer/vertex/material_buffer.h
@@ -0,0 +1,18 @@
+#pragma once
+
+#include <GL/glew.h>
+
+class MaterialBuffer {
+private:
+	const GLuint _nX;
+	const GLuint _nY;
+
+	GLuint _array;
+	GLuint _buffer;
+
+public:
+	MaterialBuffer(GLuint nX, GLuint nY);
+	~MaterialBuffer();
+
+	GLuint getBuffer() const;
+};