#if __APPLE_CC__
#include <GLUT/glut.h>
#else
#include <windows.h>
#include <gl\gl.h>
#include <gl\glu.h>
#include "glut.h"
#endif
#include <math.h>
#include <stdio.h>
#include "scene.h"
#include <string.h>
extern float g_t;
//function prototypes for the local functions
void drawCone(float x, float y, float z, float radius, float height, int nSides, float startColor[3], float endColor[3]);
void drawBox(float left, float bottom, float front,
float length, float height, float depth);
/*
this function is called whenever OpenGL needs to redraw
the screen
*/
void drawScene(void)
{
float startColor[3] = { 0.5, 0.0, 0.0}, endColor[3] = {1.0, 1.0, 0.0};
// drawCone(0,-1,0, 0.5, 1.0, 20, startColor, endColor);
// drawCone(0,1,0, 0.5, -1.0, 20, startColor, endColor);
// glEnable(GL_CULL_FACE);
// glCullFace(GL_BACK);
//tabletop
drawBox(-1, 1, 0.5, 2.0, 0.1, 1);
//left, front leg
drawBox(-1, 0, 0.5, .1, 1, .1);
glColor3f(0,0,0);
glutWireTorus(0.1, .25, 12, 16);
glTranslatef(0.0, 1.25, 0.0);
glutWireTeapot(0.2);
glTranslatef(0.0, -1.25, 0.0);
}//drawScene
void drawCone(float x, float y, float z, float radius, float height, int nSides, float startColor[3], float endColor[3])
{
int i, j, next;
float angle;
float circlePoints[100][3];
float colors[100][3];
//first calculate the points on a circle and the color for each point
for(i = 0; i < nSides; ++i)
{
angle = 2* M_PI/nSides * i;
circlePoints[i][0] = radius * sin(angle) + x;
circlePoints[i][1] = y;
circlePoints[i][2] = radius * cos(angle) + z;
colors[i][0] = (endColor[0]- startColor[0])/ nSides * i + startColor[0];
colors[i][1] = (endColor[1]- startColor[1])/ nSides * i + startColor[1];
colors[i][2] = (endColor[2]- startColor[2])/ nSides * i + startColor[2];
}
//draw the cone
glBegin(GL_TRIANGLES);
for(i = 0; i < nSides; ++i)
{
next = (i + 1) % nSides;
glColor3f(colors[i][0], colors[i][1], colors[i][2]);
glVertex3f(circlePoints[next][0], circlePoints[next][1], circlePoints[next][2]);
glVertex3f(x, y + height, z);
glVertex3f(circlePoints[i][0], circlePoints[i][1], circlePoints[i][2]);
// glVertex3f(x, y + height, z);
}
glEnd();
//draw the circle
glBegin(GL_POLYGON);
for(i = 0; i < nSides; ++i)
{
glColor3f(startColor[0], startColor[1], startColor[2]);
glVertex3f(circlePoints[i][0], circlePoints[i][1], circlePoints[i][2]);
}
glVertex3f(circlePoints[0][0], circlePoints[0][1], circlePoints[0][2]);
glEnd();
}
/*
x,X left
y,Y bottom
z Z front
l L length
h H height
d D depth
*/
void handleKey(char key)
{
printf("key = %c\n", key);
}
void drawBox(float left, float bottom, float front,
float length, float height, float depth)
{
float right = left + length;
float top = bottom + height;
float back = front - depth;
//draw the front
glBegin(GL_QUADS);
//front
glColor3f(1.0, 0.0, 0.0);
glVertex3f(left, bottom, front);
glVertex3f(right, bottom, front);
glVertex3f(right, top, front);
glVertex3f(left, top, front);
//left
glColor3f(0.0, 1.0, 0.0);
glVertex3f(left, bottom, front);
glVertex3f(left, top, front);
glVertex3f(left, top, back);
glVertex3f(left, bottom, back);
//back
glColor3f(0.0, 0.0, 1.0);
glVertex3f(left, bottom, back);
glVertex3f(left, top, back);
glVertex3f(right, top, back);
glVertex3f(right, bottom, back);
//top
glColor3f(0.0, 1.0, 1.0);
glVertex3f(left, top, front);
glVertex3f(right, top, front);
glVertex3f(right, top, back);
glVertex3f(left, top, back);
//bottom
glColor3f(1.0, 0.0, 1.0);
glVertex3f(left, bottom, front);
glVertex3f(right, bottom, front);
glVertex3f(right, bottom, back);
glVertex3f(left, bottom, back);
glEnd();
}
Undefined symbols for architecture x86_64: "_main", referenced from: implicit entry/start for main executable ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
i copy pasted this because i needed more words in body
Ld /Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Products/Debug/scene normal (in target 'scene' from project 'scene') cd /Users/dahirali/Desktop/1101/scene /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -target x86_64-apple-macos10.15 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -L/Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Products/Debug -F/Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Products/Debug -filelist /Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Intermediates.noindex/scene.build/Debug/scene.build/Objects-normal/x86_64/scene.LinkFileList -Xlinker -object_path_lto -Xlinker /Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Intermediates.noindex/scene.build/Debug/scene.build/Objects-normal/x86_64/scene_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -Xlinker -dependency_info -Xlinker /Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Intermediates.noindex/scene.build/Debug/scene.build/Objects-normal/x86_64/scene_dependency_info.dat -o /Users/dahirali/Library/Developer/Xcode/DerivedData/scene-ccsieluddlpredauupsijrhisooo/Build/Products/Debug/scene
It means you tried to compile a C source file as an executable, but there's no main function. main is called by the operating system when the executable is run.