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Mesh.cpp
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Mesh.cpp
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#include <iterator>
#include <glad/glad.h>
#include <glm/glm.hpp>
#include <glm/ext/scalar_constants.hpp>
#include "Mesh.h"
Mesh::Mesh() {
vertexArray = 0;
vertexBuffer = 0;
elementBuffer = 0;
isLoaded = false;
}
bool Mesh::createTetrahedron() {
if (textures.empty()) {
if (!loadTextures()) {
return false;
}
}
const float sqrt1_3 = glm::inversesqrt(3.0f);
const float sqrt1_12 = 0.5f * sqrt1_3;
const float sqrt3_8 = glm::sqrt(0.375f);
const float sqrt1_24 = 0.5f * glm::inversesqrt(6.0f);
const float sqrt2 = glm::sqrt(2.0f);
const float sqrt2_3 = glm::sqrt(2.0f / 3.0f);
vertices = {
Vertex(glm::vec3(0.5f, -sqrt1_24, -sqrt1_12), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(0.0f)),
Vertex(glm::vec3(0.0f, -sqrt1_24, sqrt1_3), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(0.0f)),
Vertex(glm::vec3(-0.5f, -sqrt1_24, -sqrt1_12), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f)),
Vertex(glm::vec3(0.0f, sqrt3_8, 0.0f), glm::vec3(-sqrt2_3, 1.0f / 3.0f, sqrt2 / 3.0f),
glm::vec3(1.0f, 1.0f, 0.0f), glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(-0.5f, -sqrt1_24, -sqrt1_12), glm::vec3(-sqrt2_3, 1.0f / 3.0f, sqrt2 / 3.0f),
glm::vec3(1.0f, 0.0f, 0.0f), glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.0f, -sqrt1_24, sqrt1_3), glm::vec3(-sqrt2_3, 1.0f / 3.0f, sqrt2 / 3.0f),
glm::vec3(0.0f, 1.0f, 0.0f), glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.0f, sqrt3_8, 0.0f), glm::vec3(sqrt2_3, 1.0f / 3.0f, sqrt2 / 3.0f),
glm::vec3(1.0f, 1.0f, 0.0f), glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(0.0f, -sqrt1_24, sqrt1_3), glm::vec3(sqrt2_3, 1.0f / 3.0f, sqrt2 / 3.0f),
glm::vec3(0.0f, 1.0f, 0.0f), glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.5f, -sqrt1_24, -sqrt1_12), glm::vec3(sqrt2_3, 1.0f / 3.0f, sqrt2 / 3.0f),
glm::vec3(0.0f, 0.0f, 1.0f), glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(0.0f, sqrt3_8, 0.0f), glm::vec3(0.0f, 1.0f / 3.0f, -2.0f * sqrt2 / 3.0f),
glm::vec3(1.0f, 1.0f, 0.0f), glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(0.5f, -sqrt1_24, -sqrt1_12), glm::vec3(0.0f, 1.0f / 3.0f, -2.0f * sqrt2 / 3.0f),
glm::vec3(0.0f, 0.0f, 1.0f), glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(-0.5f, -sqrt1_24, -sqrt1_12), glm::vec3(0.0f, 1.0f / 3.0f, -2.0f * sqrt2 / 3.0f),
glm::vec3(1.0f, 0.0f, 0.0f), glm::vec2(0.0f, 1.0f))
};
indices = {};
loadVertexArray();
isLoaded = true;
return true;
}
bool Mesh::createCube() {
if (textures.empty()) {
if (!loadTextures()) {
return false;
}
}
vertices = {
// front face
Vertex(glm::vec3(-0.5f, -0.5f, 0.5f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.5f, -0.5f, 0.5f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.5f, 0.5f, 0.5f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(-0.5f, 0.5f, 0.5f), glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 1.0f)),
// back face
Vertex(glm::vec3(0.5f, -0.5f, -0.5f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(-0.5f, -0.5f, -0.5f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(-0.5f, 0.5f, -0.5f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(0.5f, 0.5f, -0.5f), glm::vec3(0.0f, 0.0f, -1.0f), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 1.0f)),
// right face
Vertex(glm::vec3(0.5f, -0.5f, 0.5f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.5f, -0.5f, -0.5f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.5f, 0.5f, -0.5f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(0.5f, 0.5f, 0.5f), glm::vec3(1.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(0.0f, 1.0f)),
// left face
Vertex(glm::vec3(-0.5f, -0.5f, -0.5f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(-0.5f, -0.5f, 0.5f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(-0.5f, 0.5f, 0.5f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(-0.5f, 0.5f, -0.5f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(0.0f, 1.0f)),
// top face
Vertex(glm::vec3(-0.5f, 0.5f, 0.5f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.5f, 0.5f, 0.5f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.5f, 0.5f, -0.5f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(-0.5f, 0.5f, -0.5f), glm::vec3(0.0f, 1.0f, 0.0f), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(0.0f, 1.0f)),
// bottom face
Vertex(glm::vec3(-0.5f, -0.5f, -0.5f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.5f, -0.5f, -0.5f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.5f, -0.5f, 0.5f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(-0.5f, -0.5f, 0.5f), glm::vec3(0.0f, -1.0f, 0.0f), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 1.0f))
};
indices = {
0, 1, 2,
0, 2, 3,
4, 5, 6,
4, 6, 7,
8, 9, 10,
8, 10, 11,
12, 13, 14,
12, 14, 15,
16, 17, 18,
16, 18, 19,
20, 21, 22,
20, 22, 23
};
loadVertexArray();
isLoaded = true;
return true;
}
bool Mesh::createOctahedron() {
if (textures.empty()) {
if (!loadTextures()) {
return false;
}
}
const float sqrt1_2 = glm::sqrt(0.5f);
const float sqrt1_3 = glm::inversesqrt(3.0f);
vertices = {
Vertex(glm::vec3(-sqrt1_2, 0.0f, 0.0f), glm::vec3(-sqrt1_3, sqrt1_3, sqrt1_3), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.0f, 0.0f, sqrt1_2), glm::vec3(-sqrt1_3, sqrt1_3, sqrt1_3), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.0f, sqrt1_2, 0.0f), glm::vec3(-sqrt1_3, sqrt1_3, sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(0.0f, 0.0f, sqrt1_2), glm::vec3(sqrt1_3, sqrt1_3, sqrt1_3), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(sqrt1_2, 0.0f, 0.0f), glm::vec3(sqrt1_3, sqrt1_3, sqrt1_3), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(0.0f, sqrt1_2, 0.0f), glm::vec3(sqrt1_3, sqrt1_3, sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(sqrt1_2, 0.0f, 0.0f), glm::vec3(sqrt1_3, sqrt1_3, -sqrt1_3), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(0.0f, 0.0f, -sqrt1_2), glm::vec3(sqrt1_3, sqrt1_3, -sqrt1_3), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 1.0f)),
Vertex(glm::vec3(0.0f, sqrt1_2, 0.0f), glm::vec3(sqrt1_3, sqrt1_3, -sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(0.0f, 0.0f, -sqrt1_2), glm::vec3(-sqrt1_3, sqrt1_3, -sqrt1_3), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 1.0f)),
Vertex(glm::vec3(-sqrt1_2, 0.0f, 0.0f), glm::vec3(-sqrt1_3, sqrt1_3, -sqrt1_3), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.0f, sqrt1_2, 0.0f), glm::vec3(-sqrt1_3, sqrt1_3, -sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(-sqrt1_2, 0.0f, 0.0f), glm::vec3(-sqrt1_3, -sqrt1_3, sqrt1_3), glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 0.0f)),
Vertex(glm::vec3(0.0f, -sqrt1_2, 0.0f), glm::vec3(-sqrt1_3, -sqrt1_3, sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(0.0f, 0.0f, sqrt1_2), glm::vec3(-sqrt1_3, -sqrt1_3, sqrt1_3), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.0f, 0.0f, sqrt1_2), glm::vec3(sqrt1_3, -sqrt1_3, sqrt1_3), glm::vec3(0.0f, 1.0f, 0.0f),
glm::vec2(1.0f, 0.0f)),
Vertex(glm::vec3(0.0f, -sqrt1_2, 0.0f), glm::vec3(sqrt1_3, -sqrt1_3, sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(sqrt1_2, 0.0f, 0.0f), glm::vec3(sqrt1_3, -sqrt1_3, sqrt1_3), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(sqrt1_2, 0.0f, 0.0f), glm::vec3(sqrt1_3, -sqrt1_3, -sqrt1_3), glm::vec3(0.0f, 0.0f, 1.0f),
glm::vec2(1.0f, 1.0f)),
Vertex(glm::vec3(0.0f, -sqrt1_2, 0.0f), glm::vec3(sqrt1_3, -sqrt1_3, -sqrt1_3), glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(0.0f, 0.0f, -sqrt1_2), glm::vec3(sqrt1_3, -sqrt1_3, -sqrt1_3), glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 1.0f)),
Vertex(glm::vec3(0.0f, 0.0f, -sqrt1_2), glm::vec3(-sqrt1_3, -sqrt1_3, -sqrt1_3),
glm::vec3(1.0f, 1.0f, 0.0f),
glm::vec2(0.0f, 1.0f)),
Vertex(glm::vec3(0.0f, -sqrt1_2, 0.0f), glm::vec3(-sqrt1_3, -sqrt1_3, -sqrt1_3),
glm::vec3(0.5f, 0.5f, 0.5f),
glm::vec2(0.5f, 0.5f)),
Vertex(glm::vec3(-sqrt1_2, 0.0f, 0.0f), glm::vec3(-sqrt1_3, -sqrt1_3, -sqrt1_3),
glm::vec3(1.0f, 0.0f, 0.0f),
glm::vec2(0.0f, 0.0f))
};
indices = {};
loadVertexArray();
isLoaded = true;
return true;
}
bool Mesh::createTorus() {
if (textures.empty()) {
if (!loadTextures()) {
return false;
}
}
vertices = {};
indices = {};
const float largeRadius = 0.75f;
const float smallRadius = 0.25f;
const int largeSegments = 16;
const int smallSegments = 16;
const float largeAngleShift = 2.0f * glm::pi<float>() / (float) largeSegments;
const float smallAngleShift = 2.0f * glm::pi<float>() / (float) smallSegments;
const glm::vec3 redColor(1.0f, 0.0f, 0.0f);
const glm::vec3 greenColor(0.0f, 1.0f, 0.0f);
const glm::vec3 blueColor(0.0f, 0.0f, 1.0f);
const glm::vec3 yellowColor(1.0f, 1.0f, 0.0f);
for (int largeIndex = 0; largeIndex <= largeSegments; ++largeIndex) {
float largeAngle = largeAngleShift * (float) largeIndex;
float largeOffset = (float) largeIndex / (float) largeSegments * 4.0f;
glm::vec3 color;
if (largeOffset < 1.0f) {
color = glm::mix(redColor, greenColor, largeOffset);
} else if (largeOffset < 2.0f) {
color = glm::mix(greenColor, blueColor, largeOffset - 1.0f);
} else if (largeOffset < 3.0f) {
color = glm::mix(blueColor, yellowColor, largeOffset - 2.0f);
} else {
color = glm::mix(yellowColor, redColor, largeOffset - 3.0f);
}
for (int smallIndex = 0; smallIndex <= smallSegments; ++smallIndex) {
float smallAngle = smallAngleShift * (float) smallIndex;
float smallOffset = (float) smallIndex / (float) smallSegments * 2.0f;
glm::vec3 position(
(largeRadius + smallRadius * glm::cos(smallAngle)) * glm::cos(largeAngle),
smallRadius * glm::sin(smallAngle),
(largeRadius + smallRadius * glm::cos(smallAngle)) * glm::sin(largeAngle)
);
glm::vec3 normal(
smallRadius * glm::cos(smallAngle) * glm::cos(largeAngle),
smallRadius * glm::sin(smallAngle),
smallRadius * glm::cos(smallAngle) * glm::sin(largeAngle)
);
vertices.emplace_back(position, glm::normalize(normal), color,
glm::vec2(largeOffset, smallOffset));
if (smallIndex == smallSegments || largeIndex == largeSegments) {
continue;
}
indices.push_back(largeIndex * (smallSegments + 1) + smallIndex);
indices.push_back(largeIndex * (smallSegments + 1) + smallIndex + 1);
indices.push_back((largeIndex + 1) * (smallSegments + 1) + smallIndex + 1);
indices.push_back(largeIndex * (smallSegments + 1) + smallIndex);
indices.push_back((largeIndex + 1) * (smallSegments + 1) + smallIndex + 1);
indices.push_back((largeIndex + 1) * (smallSegments + 1) + smallIndex);
}
}
loadVertexArray();
isLoaded = true;
return true;
}
void Mesh::useTexturesOf(const Mesh &mesh) {
textures.clear();
std::copy(mesh.textures.begin(), mesh.textures.end(), std::back_inserter(textures));
}
void Mesh::attachTextures(const Shader &shader) const {
for (const auto &texture: textures) {
texture.attach(shader);
}
}
void Mesh::drawArrays() const {
for (const auto &texture: textures) {
texture.use();
}
glBindVertexArray(vertexArray);
glDrawArrays(GL_TRIANGLES, 0, (int) vertices.size());
glBindVertexArray(0);
}
void Mesh::drawElements() const {
for (const auto &texture: textures) {
texture.use();
}
glBindVertexArray(vertexArray);
glDrawElements(GL_TRIANGLES, (int) indices.size(), GL_UNSIGNED_INT, nullptr);
glBindVertexArray(0);
}
void Mesh::dispose() {
for (auto &texture: textures) {
texture.dispose();
}
textures.clear();
indices.clear();
vertices.clear();
if (isLoaded) {
glBindVertexArray(vertexArray);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glBindVertexArray(0);
glDeleteBuffers(1, &vertexBuffer);
glDeleteBuffers(1, &elementBuffer);
glDeleteVertexArrays(1, &vertexArray);
vertexBuffer = 0;
elementBuffer = 0;
vertexArray = 0;
isLoaded = false;
}
}
bool Mesh::loadTextures() {
textures = {
Texture("material.backgroundTexture", "resources/textures/background.png", 0),
Texture("material.foregroundTexture", "resources/textures/foreground.png", 1),
Texture("material.specularTexture", "resources/textures/specular.png", 2)
};
for (auto &texture: textures) {
if (!texture.load()) {
dispose();
return false;
}
}
return true;
}
void Mesh::loadVertexArray() {
glGenVertexArrays(1, &vertexArray);
glGenBuffers(1, &vertexBuffer);
if (!indices.empty()) {
glGenBuffers(1, &elementBuffer);
}
glBindVertexArray(vertexArray);
glBindBuffer(GL_ARRAY_BUFFER, vertexBuffer);
glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr) (vertices.size() * sizeof(Vertex)), vertices.data(), GL_STATIC_DRAW);
if (!indices.empty()) {
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementBuffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr) (indices.size() * sizeof(unsigned int)), indices.data(),
GL_STATIC_DRAW);
}
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *) offsetof(Vertex, position));
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *) offsetof(Vertex, normal));
glEnableVertexAttribArray(1);
glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *) offsetof(Vertex, vertexColor));
glEnableVertexAttribArray(2);
glVertexAttribPointer(3, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *) offsetof(Vertex, textureCoordinates));
glEnableVertexAttribArray(3);
glBindVertexArray(0);
}