Create mesh abstraction
This commit is contained in:
171
src/main.cc
171
src/main.cc
@@ -69,18 +69,38 @@ class Shader {
|
||||
|
||||
class Texture2D {
|
||||
public:
|
||||
Texture2D(const char *filename, GLint texture_unit);
|
||||
Texture2D(const char *filename, GLint texture_unit, const char *name);
|
||||
~Texture2D();
|
||||
void activate();
|
||||
void activate() const;
|
||||
int width;
|
||||
int height;
|
||||
int channels;
|
||||
GLint texture_unit;
|
||||
std::string name;
|
||||
private:
|
||||
GLuint texture;
|
||||
GLint texture_unit;
|
||||
GLint format;
|
||||
};
|
||||
|
||||
struct Vertex {
|
||||
glm::vec3 position;
|
||||
glm::vec3 normal;
|
||||
glm::vec2 tex_coord;
|
||||
};
|
||||
|
||||
class Mesh {
|
||||
public:
|
||||
std::vector<Vertex> vertices;
|
||||
std::vector<GLuint> indices;
|
||||
std::vector<Texture2D> textures;
|
||||
|
||||
Mesh(std::vector<Vertex> vertices, std::vector<GLuint> indices, std::vector<Texture2D> textures);
|
||||
void draw(Shader &Shader);
|
||||
private:
|
||||
GLuint vao, vbo, ebo;
|
||||
void setup_mesh();
|
||||
};
|
||||
|
||||
int main() {
|
||||
if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
|
||||
return EXIT_CODE_SDL_INIT_FAILED;
|
||||
@@ -116,32 +136,32 @@ int main() {
|
||||
|
||||
glEnable(GL_DEPTH_TEST);
|
||||
|
||||
std::vector<GLfloat> vertices = {
|
||||
// positions // normals // texture coords
|
||||
-0.5f, -0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
|
||||
0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
|
||||
0.5f, 0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
|
||||
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
|
||||
0.5f, -0.5f, 0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
|
||||
0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 1.0f,
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f,
|
||||
0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f,
|
||||
-0.5f, -0.5f, -0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 1.0f,
|
||||
0.5f, 0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 1.0f, 1.0f,
|
||||
0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 1.0f, 0.0f,
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, -1.0f, 0.0f, 0.0f, 0.0f,
|
||||
0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 1.0f,
|
||||
0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 0.0f,
|
||||
0.5f, -0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 1.0f, 0.0f,
|
||||
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f,
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
|
||||
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f,
|
||||
-0.5f, -0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f,
|
||||
-0.5f, 0.5f, -0.5f, 0.0f, 0.0f, -1.0f, 0.0f, 1.0f,
|
||||
-0.5f, 0.5f, -0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 1.0f,
|
||||
0.5f, 0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f,
|
||||
-0.5f, 0.5f, 0.5f, -1.0f, 0.0f, 0.0f, 1.0f, 0.0f,
|
||||
0.5f, -0.5f, -0.5f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f,
|
||||
std::vector<Vertex> vertices = {
|
||||
// positions // normals // texture coords
|
||||
Vertex{glm::vec3(-0.5f, -0.5f, -0.5f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec2(0.0f, 1.0f)},
|
||||
Vertex{glm::vec3( 0.5f, 0.5f, 0.5f), 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::vec2(1.0f, 1.0f)},
|
||||
Vertex{glm::vec3(-0.5f, 0.5f, 0.5f), glm::vec3( 0.0f, 0.0f, 1.0f), glm::vec2(0.0f, 1.0f)},
|
||||
Vertex{glm::vec3( 0.5f, -0.5f, 0.5f), 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, -1.0f, 0.0f), glm::vec2(1.0f, 1.0f)},
|
||||
Vertex{glm::vec3(-0.5f, -0.5f, -0.5f), glm::vec3( 0.0f, 0.0f, -1.0f), glm::vec2(0.0f, 0.0f)},
|
||||
Vertex{glm::vec3( 0.5f, -0.5f, 0.5f), 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::vec2(0.0f, 1.0f)},
|
||||
Vertex{glm::vec3( 0.5f, 0.5f, 0.5f), 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, -1.0f, 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::vec2(0.0f, 0.0f)},
|
||||
Vertex{glm::vec3( 0.5f, 0.5f, -0.5f), 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, 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::vec2(1.0f, 0.0f)},
|
||||
Vertex{glm::vec3(-0.5f, 0.5f, 0.5f), 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::vec2(0.0f, 1.0f)},
|
||||
Vertex{glm::vec3(-0.5f, -0.5f, 0.5f), glm::vec3( 0.0f, 0.0f, 1.0f), glm::vec2(0.0f, 0.0f)},
|
||||
Vertex{glm::vec3(-0.5f, -0.5f, 0.5f), glm::vec3(-1.0f, 0.0f, 0.0f), glm::vec2(0.0f, 0.0f)},
|
||||
Vertex{glm::vec3(-0.5f, 0.5f, -0.5f), glm::vec3( 0.0f, 0.0f, -1.0f), glm::vec2(0.0f, 1.0f)},
|
||||
Vertex{glm::vec3(-0.5f, 0.5f, -0.5f), glm::vec3(-1.0f, 0.0f, 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::vec2(1.0f, 1.0f)},
|
||||
Vertex{glm::vec3(-0.5f, 0.5f, 0.5f), 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::vec2(0.0f, 1.0f)},
|
||||
};
|
||||
|
||||
std::vector<GLuint> indices = {
|
||||
@@ -159,48 +179,17 @@ int main() {
|
||||
13, 15, 16
|
||||
};
|
||||
|
||||
GLuint vao = 0;
|
||||
glGenVertexArrays(1, &vao);
|
||||
glBindVertexArray(vao);
|
||||
std::vector<Texture2D> textures = {
|
||||
Texture2D("images/container2.png", GL_TEXTURE0, "material.diffuse"),
|
||||
Texture2D("images/container2_specular.png", GL_TEXTURE1, "material.specular"),
|
||||
};
|
||||
|
||||
GLuint ebo = 0;
|
||||
glGenBuffers(1, &ebo);
|
||||
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
|
||||
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), indices.data(), GL_STATIC_DRAW);
|
||||
|
||||
GLuint vbo = 0;
|
||||
glGenBuffers(1, &vbo);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, vbo);
|
||||
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(GLfloat), vertices.data(), GL_STATIC_DRAW);
|
||||
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void *)0);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void *)(3 * sizeof(GLfloat)));
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void *)(6 * sizeof(GLfloat)));
|
||||
glEnableVertexAttribArray(2);
|
||||
|
||||
GLuint light_vao = 0;
|
||||
glGenVertexArrays(1, &light_vao);
|
||||
glBindVertexArray(light_vao);
|
||||
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, vbo);
|
||||
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(GLfloat), (void *)0);
|
||||
glEnableVertexAttribArray(0);
|
||||
|
||||
glBindVertexArray(0);
|
||||
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
|
||||
glBindBuffer(GL_ARRAY_BUFFER, 0);
|
||||
Mesh container = {vertices, indices, textures};
|
||||
Mesh light = {vertices, indices, {}};
|
||||
|
||||
Shader main_shader {"shaders/vert.glsl", "shaders/frag.glsl"};
|
||||
Shader light_shader {"shaders/vert.glsl", "shaders/light_frag.glsl"};
|
||||
|
||||
Texture2D diffuse_map = Texture2D("images/container2.png", GL_TEXTURE0);
|
||||
Texture2D specular_map = Texture2D("images/container2_specular.png", GL_TEXTURE1);
|
||||
main_shader.set_int("material.diffuse", 0);
|
||||
main_shader.set_int("material.specular", 1);
|
||||
|
||||
const float camera_speed = 25.0f;
|
||||
glm::vec3 camera_position = glm::vec3(-2.0f, 0.0f, 6.0f);
|
||||
glm::vec3 camera_forward = glm::vec3(0.0f);
|
||||
@@ -382,10 +371,7 @@ int main() {
|
||||
main_shader.activate();
|
||||
main_shader.set_mat4("model", model);
|
||||
main_shader.set_mat3("normal_mat", normal_mat);
|
||||
diffuse_map.activate();
|
||||
specular_map.activate();
|
||||
glBindVertexArray(vao);
|
||||
glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, (void *)0);
|
||||
container.draw(main_shader);
|
||||
}
|
||||
|
||||
// Draw light source
|
||||
@@ -395,8 +381,7 @@ int main() {
|
||||
light_shader.activate();
|
||||
light_shader.set_mat4("model", model);
|
||||
light_shader.set_vec3("light_diffuse", light_diffuse);
|
||||
glBindVertexArray(light_vao);
|
||||
glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, (void *)0);
|
||||
light.draw(light_shader);
|
||||
}
|
||||
|
||||
SDL_GL_SwapWindow(window);
|
||||
@@ -546,7 +531,7 @@ const char *Shader::get_shader_type_string(GLenum shader_type) {
|
||||
return output;
|
||||
}
|
||||
|
||||
Texture2D::Texture2D(const char *filename, GLint texture_unit) : texture_unit(texture_unit) {
|
||||
Texture2D::Texture2D(const char *filename, GLint texture_unit, const char *name) : texture_unit(texture_unit), name(name) {
|
||||
uint8_t *image = stbi_load(filename, &width, &height, &channels, 0);
|
||||
if (!image) {
|
||||
return;
|
||||
@@ -572,7 +557,45 @@ Texture2D::Texture2D(const char *filename, GLint texture_unit) : texture_unit(te
|
||||
|
||||
Texture2D::~Texture2D() {}
|
||||
|
||||
void Texture2D::activate() {
|
||||
void Texture2D::activate() const {
|
||||
glActiveTexture(texture_unit);
|
||||
glBindTexture(GL_TEXTURE_2D, texture);
|
||||
}
|
||||
|
||||
Mesh::Mesh(std::vector<Vertex> vertices, std::vector<GLuint> indices, std::vector<Texture2D> textures)
|
||||
: vertices(vertices), indices(indices), textures(textures) {
|
||||
setup_mesh();
|
||||
}
|
||||
|
||||
void Mesh::setup_mesh() {
|
||||
glGenVertexArrays(1, &vao);
|
||||
glGenBuffers(1, &ebo);
|
||||
glGenBuffers(1, &vbo);
|
||||
|
||||
glBindVertexArray(vao);
|
||||
|
||||
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
|
||||
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), indices.data(), GL_STATIC_DRAW);
|
||||
|
||||
glBindBuffer(GL_ARRAY_BUFFER, vbo);
|
||||
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW);
|
||||
|
||||
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)0);
|
||||
glEnableVertexAttribArray(0);
|
||||
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)(offsetof(Vertex, normal)));
|
||||
glEnableVertexAttribArray(1);
|
||||
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void *)(offsetof(Vertex, tex_coord)));
|
||||
glEnableVertexAttribArray(2);
|
||||
}
|
||||
|
||||
void Mesh::draw(Shader &shader) {
|
||||
for (int i = 0; i < textures.size(); ++i) {
|
||||
const Texture2D &texture = textures[i];
|
||||
shader.set_int(texture.name.c_str(), texture.texture_unit - GL_TEXTURE0);
|
||||
texture.activate();
|
||||
}
|
||||
|
||||
glBindVertexArray(vao);
|
||||
glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, (void *)0);
|
||||
glBindVertexArray(0);
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user