1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ElapsedTimer.h>
#include <LibGL/GL/gl.h>
#include <LibGL/GLContext.h>
#include <LibGUI/Application.h>
#include <LibGUI/Icon.h>
#include <LibGUI/Painter.h>
#include <LibGUI/Widget.h>
#include <LibGUI/Window.h>
#include <LibGfx/Bitmap.h>
#include <unistd.h>
#include "Mesh.h"
#include "MeshLoader.h"
#include "WavefrontOBJLoader.h"
static constexpr u16 RENDER_WIDTH = 640;
static constexpr u16 RENDER_HEIGHT = 480;
class GLContextWidget final : public GUI::Widget {
C_OBJECT(GLContextWidget)
public:
private:
GLContextWidget()
{
m_bitmap = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRx8888, { RENDER_WIDTH, RENDER_HEIGHT });
m_context = GL::create_context(*m_bitmap);
start_timer(20);
GL::make_context_current(m_context);
glFrontFace(GL_CW);
glEnable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
// Set projection matrix
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-0.5, 0.5, -0.5, 0.5, 1, 1500);
m_init_list = glGenLists(1);
glNewList(m_init_list, GL_COMPILE);
{
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClearDepth(1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
glEndList();
// Load the teapot
auto mesh_loader = adopt_own(*new WavefrontOBJLoader());
m_teapot = mesh_loader->load("/res/gl/teapot.obj");
dbgln("GLTeapot: teapot mesh has {} triangles.", m_teapot->triangle_count());
}
virtual void paint_event(GUI::PaintEvent&) override;
virtual void timer_event(Core::TimerEvent&) override;
private:
RefPtr<Mesh> m_teapot;
RefPtr<Gfx::Bitmap> m_bitmap;
OwnPtr<GL::GLContext> m_context;
GLuint m_init_list { 0 };
};
void GLContextWidget::paint_event(GUI::PaintEvent& event)
{
GUI::Painter painter(*this);
painter.add_clip_rect(event.rect());
painter.draw_scaled_bitmap(rect(), *m_bitmap, m_bitmap->rect());
}
void GLContextWidget::timer_event(Core::TimerEvent&)
{
static float angle = 0.0f;
glCallList(m_init_list);
angle -= 0.01f;
auto matrix = FloatMatrix4x4::translate(FloatVector3(0, 0, -8.5))
* FloatMatrix4x4::rotate(FloatVector3(1, 0, 0), angle)
* FloatMatrix4x4::rotate(FloatVector3(0, 1, 0), 0.0f)
* FloatMatrix4x4::rotate(FloatVector3(0, 0, 1), angle);
// We need to transpose here because OpenGL expects matrices in column major order
// but our matrix class stores elements in row major order.
matrix = matrix.transpose();
glMatrixMode(GL_MODELVIEW);
glLoadMatrixf((float*)matrix.elements());
m_teapot->draw();
m_context->present();
update();
}
int main(int argc, char** argv)
{
auto app = GUI::Application::construct(argc, argv);
if (pledge("stdio recvfd sendfd rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
if (unveil("/res", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil(nullptr, nullptr) < 0) {
perror("unveil");
return 1;
}
// Construct the main window
auto window = GUI::Window::construct();
auto app_icon = GUI::Icon::default_icon("app-teapot");
window->set_icon(app_icon.bitmap_for_size(16));
window->set_title("GLTeapot");
window->resize(640, 480);
window->set_resizable(false);
window->set_double_buffering_enabled(true);
window->set_main_widget<GLContextWidget>();
window->show();
return app->exec();
}
|
