renderer/mesh.cpp at main · Ratchette/renderer · GitHub

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#include "mesh.hpp"

Mesh::Mesh(vector<Vertex> vertices, vector<unsigned int> indices, vector<Texture> textures) :
	vertices{ vertices }, indices{ indices }, textures{ textures } {

	glGenVertexArrays(1, &VAO);
	glGenBuffers(1, &VBO);
	glGenBuffers(1, &EBO);

	glBindVertexArray(VAO);
	glBindBuffer(GL_ARRAY_BUFFER, VBO);

	glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_STATIC_DRAW);

	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
	glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_STATIC_DRAW);

	// Vertex positions
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);

	// Vertex normals
	glEnableVertexAttribArray(1);
	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, normal));

	// Texture coordinates
	glEnableVertexAttribArray(2);
	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, textureCoordinates));

	// vertex tangent
	glEnableVertexAttribArray(3);
	glVertexAttribPointer(3, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Tangent));

	// vertex bitangent
	glEnableVertexAttribArray(4);
	glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, Bitangent));

	// ids
	glEnableVertexAttribArray(5);
	glVertexAttribIPointer(5, 4, GL_INT, sizeof(Vertex), (void*)offsetof(Vertex, m_BoneIDs));

	// weights
	glEnableVertexAttribArray(6);
	glVertexAttribPointer(6, 4, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, m_Weights));

	glBindVertexArray(0);
}

void Mesh::Draw(Shader& shader) {
	unsigned int diffuseNum = 0;
	unsigned int specularNum = 0;
	unsigned int normalNum = 0;
	unsigned int heightNum = 0;

	for (int i = 0; i < textures.size(); i++) {
		glActiveTexture(GL_TEXTURE0 + i);

		string number;
		string name = textures[i].type;

		if (name == "texture_diffuse") {
			number = std::to_string(diffuseNum++);
		} else if (name == "texture_specular") {
			number = std::to_string(specularNum++);
		} else if (name == "texture_normal") {
			number = std::to_string(normalNum++);
		} else if (name == "texture_height") {
			number = std::to_string(heightNum++);
		}

		shader.setInt((name + number).c_str(), i);
		glBindTexture(GL_TEXTURE_2D, textures[i].id);
	}

	glBindVertexArray(VAO);
	glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);
	glBindVertexArray(0);

	glActiveTexture(GL_TEXTURE0);
}