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Add OBJ loader

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This commit is contained in:
Meoweg 2015-11-05 14:28:18 +00:00
parent adf105ecfe
commit bada59af72
4 changed files with 11415 additions and 76 deletions
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7474
data/models/bunny.obj Normal file
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File diff suppressed because it is too large Load diff

1478
data/models/suzanne.obj Normal file
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File diff suppressed because it is too large Load diff

2392
data/models/teapot.obj Normal file
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147
main.cpp
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@ -1,4 +1,7 @@
#include <cstdlib>
#include <vector>
#include <fstream>
#include <sstream>
#include <glm/glm.hpp>
#include <glm/gtc/type_ptr.hpp>
@ -28,76 +31,21 @@ static bool keys[GLFW_KEY_LAST];
static float pos_x = 0, pos_y = -4;
static float delta_z = 0, delta_x = 0;
static GLuint cube_id;
static GLuint pyramid_id;
static std::vector<GLfloat> positions;
static std::vector<GLfloat> colors;
static GLfloat vertices[] = {
// front
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
// back
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
-1.0, 1.0, -1.0,
// pyramid
0.0, 0.0, 1.0,
-0.5, -0.5, 0.0,
0.5, 0.5, 0.0,
-0.5, 0.5, 0.0,
0.5, -0.5, 0.0,
struct Model
{
std::vector<GLushort> elements;
GLsizei count;
GLuint id;
};
const GLfloat colors[] = {
// front colors
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
1.0, 1.0, 1.0,
// back colors
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
1.0, 1.0, 1.0,
// pyramid
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
1.0, 1.0, 0.0,
1.0, 0.0, 1.0,
};
static void load_obj(const char *filename, Model *model);
const GLushort cube[] = {
// front
0, 1, 2,
2, 3, 0,
// top
3, 2, 6,
6, 7, 3,
// back
7, 6, 5,
5, 4, 7,
// bottom
4, 5, 1,
1, 0, 4,
// left
4, 0, 3,
3, 7, 4,
// right
1, 5, 6,
6, 2, 1,
};
const GLushort pyramid[] = {
8, 9, 11,
8, 9, 12,
8, 10, 11,
8, 10, 12,
9, 10, 11,
9, 10, 12,
};
static Model suzanne;
static Model teapot;
static Model bunny;
int main()
{
@ -125,15 +73,16 @@ int main()
mvp_id = glGetUniformLocation(program, "mvp");
create_array_buffer(0, sizeof(vertices), vertices, 3, GL_FLOAT);
load_obj("/data/models/suzanne.obj", &suzanne);
load_obj("/data/models/teapot.obj", &teapot);
load_obj("/data/models/bunny.obj", &bunny);
create_array_buffer(0, 21000 * sizeof(GLfloat), positions.data(), 3, GL_FLOAT);
glEnableVertexAttribArray(0);
create_array_buffer(1, sizeof(colors), colors, 3, GL_FLOAT);
create_array_buffer(1, 21000 * sizeof(GLfloat), colors.data(), 3, GL_FLOAT);
glEnableVertexAttribArray(1);
cube_id = create_element_array_buffer(sizeof(cube), cube);
pyramid_id = create_element_array_buffer(sizeof(pyramid), pyramid);
glViewport(0, 0, 640, 480);
glEnable(GL_DEPTH_TEST);
@ -239,15 +188,22 @@ void iterate()
glUniformMatrix4fv(mvp_id, 1, GL_FALSE, glm::value_ptr(mvp));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cube_id);
glDrawElements(GL_TRIANGLES, 6 * 2 * 3, GL_UNSIGNED_SHORT, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, suzanne.id);
glDrawElements(GL_TRIANGLES, suzanne.count, GL_UNSIGNED_SHORT, 0);
mvp = glm::translate(mvp, glm::vec3(2.0f, 0.0f, 0.0f))
mvp = glm::translate(mvp, glm::vec3(4.0f, 0.0f, 0.0f))
* glm::rotate(glm::mat4(1.0f), glm::radians(-45.0f), glm::vec3(0.0f, 0.0f, 1.0f));
glUniformMatrix4fv(mvp_id, 1, GL_FALSE, glm::value_ptr(mvp));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, pyramid_id);
glDrawElements(GL_TRIANGLES, 6 * 3, GL_UNSIGNED_SHORT, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, teapot.id);
glDrawElements(GL_TRIANGLES, teapot.count, GL_UNSIGNED_SHORT, 0);
mvp = glm::translate(mvp, glm::vec3(-4.0f, 0.0f, 0.0f))
* glm::rotate(glm::mat4(1.0f), glm::radians(-45.0f), glm::vec3(0.0f, 0.0f, 1.0f));
glUniformMatrix4fv(mvp_id, 1, GL_FALSE, glm::value_ptr(mvp));
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bunny.id);
glDrawElements(GL_TRIANGLES, bunny.count, GL_UNSIGNED_SHORT, 0);
}
GLFWCALL void on_key(int key, int action)
@ -274,3 +230,42 @@ EM_BOOL on_em_mousemove(int event_type, const EmscriptenMouseEvent *mouse_event,
return true;
}
void load_obj(const char *filename, Model *model)
{
const GLsizei offset = positions.size() / 3;
std::ifstream file(filename, std::ios::in);
std::string line;
while (std::getline(file, line))
{
if (line.substr(0,2) == "v ")
{
std::istringstream s(line.substr(2));
GLfloat x, y, z;
s >> x; s >> y, s >> z;
positions.push_back(x);
positions.push_back(y);
positions.push_back(z);
colors.push_back(1.0f);
colors.push_back(0.0f);
colors.push_back(0.0f);
}
else
if (line.substr(0,2) == "f ")
{
std::istringstream s(line.substr(2));
GLushort a, b, c;
s >> a;
s >> b;
s >> c;
model->elements.push_back(offset + a - 1);
model->elements.push_back(offset + b - 1);
model->elements.push_back(offset + c - 1);
}
}
model->count = model->elements.size();
model->id = create_element_array_buffer(model->count * sizeof(GLushort), model->elements.data());
}