From 400410fcd436d5e4310bfa779f0309c5fae5b2c2 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 16 Jan 2021 18:09:15 +0000
Subject: Initial commit

Stripped back and formatted from https://github.com/BennyQBD/ModernOpenGLTutorial/
---
 mesh.cpp | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 mesh.cpp

(limited to 'mesh.cpp')

diff --git a/mesh.cpp b/mesh.cpp
new file mode 100644
index 0000000..19f3a82
--- /dev/null
+++ b/mesh.cpp
@@ -0,0 +1,80 @@
+#include "mesh.h"
+#include "debugTimer.h"
+#include "util.h"
+#include <algorithm>
+#include <fstream>
+#include <iostream>
+#include <map>
+#include <stdlib.h>
+
+Mesh::Mesh(const std::string & fileName)
+{
+	InitMesh(OBJModel(fileName).ToIndexedModel());
+}
+
+void
+Mesh::InitMesh(const IndexedModel & model)
+{
+	m_numIndices = model.indices.size();
+
+	glGenVertexArrays(1, &m_vertexArrayObject);
+	glBindVertexArray(m_vertexArrayObject);
+
+	glGenBuffers(NUM_BUFFERS, m_vertexArrayBuffers);
+
+	glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffers[POSITION_VB]);
+	glBufferData(
+			GL_ARRAY_BUFFER, sizeof(model.positions[0]) * model.positions.size(), &model.positions[0], GL_STATIC_DRAW);
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
+
+	glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffers[TEXCOORD_VB]);
+	glBufferData(
+			GL_ARRAY_BUFFER, sizeof(model.texCoords[0]) * model.texCoords.size(), &model.texCoords[0], GL_STATIC_DRAW);
+	glEnableVertexAttribArray(1);
+	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, 0);
+
+	glBindBuffer(GL_ARRAY_BUFFER, m_vertexArrayBuffers[NORMAL_VB]);
+	glBufferData(GL_ARRAY_BUFFER, sizeof(model.normals[0]) * model.normals.size(), &model.normals[0], GL_STATIC_DRAW);
+	glEnableVertexAttribArray(2);
+	glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 0, 0);
+
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_vertexArrayBuffers[INDEX_VB]);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(model.indices[0]) * model.indices.size(), &model.indices[0],
+			GL_STATIC_DRAW);
+
+	glBindVertexArray(0);
+}
+
+Mesh::Mesh(Vertex * vertices, unsigned int numVertices, unsigned int * indices, unsigned int numIndices)
+{
+	IndexedModel model;
+
+	for (unsigned int i = 0; i < numVertices; i++) {
+		model.positions.push_back(*vertices[i].GetPos());
+		model.texCoords.push_back(*vertices[i].GetTexCoord());
+		model.normals.push_back(*vertices[i].GetNormal());
+	}
+
+	for (unsigned int i = 0; i < numIndices; i++)
+		model.indices.push_back(indices[i]);
+
+	InitMesh(model);
+}
+
+Mesh::~Mesh()
+{
+	glDeleteBuffers(NUM_BUFFERS, m_vertexArrayBuffers);
+	glDeleteVertexArrays(1, &m_vertexArrayObject);
+}
+
+void
+Mesh::Draw()
+{
+	glBindVertexArray(m_vertexArrayObject);
+
+	// glDrawElements(GL_TRIANGLES, m_numIndices, GL_UNSIGNED_INT, 0);
+	glDrawElementsBaseVertex(GL_TRIANGLES, m_numIndices, GL_UNSIGNED_INT, 0, 0);
+
+	glBindVertexArray(0);
+}
-- 
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