From 472f280108a6c5fca158c3f4436269ae40bf548c Mon Sep 17 00:00:00 2001
From: trotFunky <teo.couprie_diaz@telecom-sudparis.eu>
Date: Tue, 24 Sep 2019 09:34:53 +0200
Subject: [PATCH] Base program with rotating pyramids

---
 .gitignore     |   2 +
 CMakeLists.txt |  22 +++++++++
 src/main.cpp   | 121 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 145 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CMakeLists.txt
 create mode 100644 src/main.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..822dd55
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+cmake-build-*/
+.idea/
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..b47a9b3
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.14)
+project(tests_opengl)
+
+set(CMAKE_CXX_STANDARD 14)
+
+find_package(OpenGL REQUIRED)
+find_package(GLUT REQUIRED)
+
+if(NOT ${OPENGL_GLU_FOUND})
+    message(FATAL_ERROR "Glu not installed!")
+endif()
+
+add_executable(tests_opengl
+        src/main.cpp)
+
+target_link_libraries(tests_opengl
+        ${OPENGL_LIBRARIES}
+        ${GLUT_LIBRARIES})
+
+target_include_directories(tests_opengl PRIVATE
+        ${OPENGL_INCLUDE_DIR}
+        ${GLUT_INCLUDE_DIR})
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..cb2b7c4
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,121 @@
+#include "GL/glut.h"
+
+
+volatile unsigned long long int timer_ticks = 0;
+
+/// Displays a square based pyramid from a base position, height and side length
+/// \param x X coordinate of the center
+/// \param y Y coordinate of the center
+/// \param z Z coordinate of the center
+/// \param c Side length of the square
+/// \param h Height of the pyramid
+void display_pyramid(float x, float y, float z, float c, float h)
+{
+    glBegin(GL_TRIANGLES);
+
+    // First side
+    glColor3f(1,0,0);
+
+    // Summit
+    glVertex3f(x,y+h,z);
+    glVertex3f(x+c/2,y,z+c/2);
+    glVertex3f(x-c/2,y,z+c/2);
+
+    // Second side
+    glColor3f(0,1,0);
+
+    glVertex3f(x,y+h,z);
+    glVertex3f(x+c/2,y,z+c/2);
+    glVertex3f(x+c/2,y,z-c/2);
+
+    // Third side
+    glColor3f(0,0,1);
+
+    glVertex3f(x,y+h,z);
+    glVertex3f(x-c/2,y,z+c/2);
+    glVertex3f(x-c/2,y,z-c/2);
+
+    // Fourth side
+    glColor3f(1,1,0);
+
+    glVertex3f(x,y+h,z);
+    glVertex3f(x-c/2,y,z-c/2);
+    glVertex3f(x+c/2,y,z-c/2);
+
+    glEnd();
+    // Bottom
+    glBegin(GL_QUADS);
+
+    glColor3f(0,1,1);
+    glVertex3f(x-c/2,y,z-c/2);
+    glVertex3f(x-c/2,y,z+c/2);
+    glVertex3f(x+c/2,y,z+c/2);
+    glVertex3f(x+c/2,y,z-c/2);
+
+    glEnd();
+}
+
+/// Draw a pyramid rotated around its axis
+void display_rotating_pyramid(float x, float y, float z, float c, float h, float alpha)
+{
+    glPushMatrix();
+    glTranslatef(x,0,z);
+    glRotatef(alpha,0,1,0);
+    glTranslatef(-x,0,-z);
+    display_pyramid(x,y,z,c,h);
+    glPopMatrix();
+}
+
+void display()
+{
+    float angleY = 1*timer_ticks;
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glMatrixMode(GL_PROJECTION);
+    // Prepare view
+    glLoadIdentity();
+    gluPerspective(60,(double)glutGet(GLUT_WINDOW_WIDTH)/(double)glutGet(GLUT_WINDOW_HEIGHT),10,30000);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    gluLookAt(10, 10, 10,
+              0, 0, 1,
+              0, 1, 0);
+
+
+    display_rotating_pyramid(0,-2,0,2,4,angleY);
+    display_rotating_pyramid(3,-2,0,1,5,angleY);
+    display_rotating_pyramid(-2,-2,4,3,2,angleY);
+
+    glutSwapBuffers();
+}
+
+void update_angle(int value)
+{
+    timer_ticks++;
+    glutTimerFunc(50,update_angle,0);
+}
+
+int main(int argc, char** argv)
+{
+    glutInit(&argc,argv);
+    // Generate window with GLUT
+    glutInitDisplayMode(GLUT_RGB| GLUT_DEPTH | GLUT_DOUBLE);
+    glutCreateWindow("Hello");
+
+    // Init OpenGL
+    glClearColor(0,0,0,1);
+    glClearDepth(1.0);
+//    glEnable(GL_LIGHTING);
+//    glEnable(GL_LIGHT0);
+    glEnable(GL_DEPTH_TEST);
+
+    glViewport(0,0,glutGet(GLUT_WINDOW_WIDTH),glutGet(GLUT_WINDOW_HEIGHT));
+
+    glutIdleFunc(display);
+    glutTimerFunc(50,update_angle,0);
+
+    // Enters main loop, managed by GLUT
+    glutMainLoop();
+	return 0;
+}