From 0bf4ad9e4a9e1c97e92aa23a365405dfef89bd7c Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 17 Jan 2021 19:36:30 +0000
Subject: Big reshuffle

Fixes code quality warnings now picked up.
---
 gfx/models/mesh.cpp | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 gfx/models/mesh.cpp

(limited to 'gfx/models/mesh.cpp')

diff --git a/gfx/models/mesh.cpp b/gfx/models/mesh.cpp
new file mode 100644
index 0000000..8c304b3
--- /dev/null
+++ b/gfx/models/mesh.cpp
@@ -0,0 +1,75 @@
+#include "mesh.h"
+#include "obj_loader.h"
+#include "vertex.hpp"
+#include <glm/glm.hpp>
+#include <memory>
+#include <vector>
+
+Mesh::Mesh(const std::string & fileName) : Mesh(OBJModel(fileName).ToIndexedModel()) { }
+
+Mesh::Mesh(const IndexedModel & model) :
+	m_vertexArrayObject {}, m_vertexArrayBuffers {}, m_numIndices {model.indices.size()}
+{
+	glGenVertexArrays(1, &m_vertexArrayObject);
+	glBindVertexArray(m_vertexArrayObject);
+
+	glGenBuffers(NUM_BUFFERS, m_vertexArrayBuffers.data());
+
+	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, nullptr);
+
+	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, nullptr);
+
+	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, nullptr);
+
+	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) :
+	Mesh {[vertices, numVertices, indices, 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]);
+		}
+
+		return model;
+	}()}
+{
+}
+
+Mesh::~Mesh()
+{
+	glDeleteBuffers(NUM_BUFFERS, m_vertexArrayBuffers.data());
+	glDeleteVertexArrays(1, &m_vertexArrayObject);
+}
+
+void
+Mesh::Draw()
+{
+	glBindVertexArray(m_vertexArrayObject);
+
+	glDrawElementsBaseVertex(GL_TRIANGLES, m_numIndices, GL_UNSIGNED_INT, nullptr, 0);
+
+	glBindVertexArray(0);
+}
-- 
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