65 lines
2 KiB
C++
65 lines
2 KiB
C++
#include "Mesh.h"
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Mesh::Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices,
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std::vector<Texture> textures) {
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this->vertices = vertices;
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this->indices = indices;
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this->textures = textures;
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setupMesh();
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}
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void Mesh::setupMesh() {
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glGenVertexArrays(1, &VAO);
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glGenBuffers(1, &VBO);
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glGenBuffers(1, &EBO);
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glBindVertexArray(VAO);
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glBindBuffer(GL_ARRAY_BUFFER, VBO);
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glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0],
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GL_STATIC_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int),
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&indices[0], GL_STATIC_DRAW);
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// vertex positions
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)0);
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// vertex normals
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
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(void *)offsetof(Vertex, Normal));
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// vertex texture coords
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glEnableVertexAttribArray(2);
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glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),
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(void *)offsetof(Vertex, TexCoords));
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glBindVertexArray(0);
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}
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void Mesh::draw(ShaderLoader &shader) {
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unsigned int diffuseNr = 1;
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unsigned int specularNr = 1;
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for (unsigned int i = 0; i < textures.size(); i++) {
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// activate proper texture unit before binding
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glActiveTexture(GL_TEXTURE0 + i);
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// retrieve texture number (the N in diffuse_textureN)
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std::string number;
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std::string name = textures[i].type;
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if (name == "texture_diffuse")
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number = std::to_string(diffuseNr++);
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else if (name == "texture_specular")
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number = std::to_string(specularNr++);
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shader.setFloat(("material." + name + number).c_str(), i);
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glBindTexture(GL_TEXTURE_2D, textures[i].id);
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}
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glActiveTexture(GL_TEXTURE0);
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// draw mesh
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glBindVertexArray(VAO);
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glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);
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glBindVertexArray(0);
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}
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