I'm a complete beginner with OpenGL, just trying to learn (starting with freeglut for the moment). So far I have the following code that should draw some basic 3D objects. The problem is that whatever I put in the render function (although it does execute), it only displays a blank window.
#include "stdafx.h"
#include <iostream>
#include "dependente\glew\glew.h"
#include "dependente\freeglut\glut.h"
void render()
{
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_DEPTH_TEST);
glTranslatef(-1.5f, 1.0f, -6.0f); // Translate back and to the left
glPushMatrix(); // Push the current modelview matrix on the matrix // Rotate on all 3 axis
glBegin(GL_TRIANGLES); // Draw a pyramid
glColor3f(1.0f, 0.0f, 0.0f); // Red
glVertex3f(0.0f, 1.0f, 0.0f); // Top of front face
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(-1.0f, -1.0f, 1.0f); // Left of front face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(1.0f, -1.0f, 1.0f); // Right of front face
glColor3f(1.0f, 0.0f, 0.0f); // Red
glVertex3f(0.0f, 1.0f, 0.0f); // Top of right face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(1.0f, -1.0f, 1.0f); // Left of right face
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(1.0f, -1.0f, -1.0f); // Right of right face
glColor3f(1.0f, 0.0f, 0.0f); // Red
glVertex3f(0.0f, 1.0f, 0.0f); // Top of back face
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(1.0f, -1.0f, -1.0f); // Left of back face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(-1.0f, -1.0f, -1.0f); // Right of back face
glColor3f(1.0f, 0.0f, 0.0f); // Red
glVertex3f(0.0f, 1.0f, 0.0f); // Top of left face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(-1.0f, -1.0f, -1.0f); // Left of left face
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(-1.0f, -1.0f, 1.0f); // Right of left face
glEnd();
// Render a quad for the bottom of our pyramid
glBegin(GL_QUADS);
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(-1.0f, -1.0f, 1.0f); // Left/right of front/left face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(1.0f, -1.0f, 1.0f); // Right/left of front/right face
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(1.0f, -1.0f, -1.0f); // Right/left of right/back face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(-1.0f, -1.0f, -1.0f); // Left/right of right/back face
glEnd();
glPopMatrix();
glTranslatef(3.0f, 0.0f, 0.0f); // Translate right
glPushMatrix(); // Push the current modelview matrix on the matrix stack // Rotate the primitive on all 3 axis
glBegin(GL_QUADS);
// Top face
glColor3f(0.0f, 1.0f, 0.0f); // Green
glVertex3f(1.0f, 1.0f, -1.0f); // Top-right of top face
glVertex3f(-1.0f, 1.0f, -1.0f); // Top-left of top face
glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom-left of top face
glVertex3f(1.0f, 1.0f, 1.0f); // Bottom-right of top face
// Bottom face
glColor3f(1.0f, 0.5f, 0.0f); // Orange
glVertex3f(1.0f, -1.0f, -1.0f); // Top-right of bottom face
glVertex3f(-1.0f, -1.0f, -1.0f); // Top-left of bottom face
glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom-left of bottom face
glVertex3f(1.0f, -1.0f, 1.0f); // Bottom-right of bottom face
// Front face
glColor3f(1.0f, 0.0f, 0.0f); // Red
glVertex3f(1.0f, 1.0f, 1.0f); // Top-Right of front face
glVertex3f(-1.0f, 1.0f, 1.0f); // Top-left of front face
glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom-left of front face
glVertex3f(1.0f, -1.0f, 1.0f); // Bottom-right of front face
// Back face
glColor3f(1.0f, 1.0f, 0.0f); // Yellow
glVertex3f(1.0f, -1.0f, -1.0f); // Bottom-Left of back face
glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom-Right of back face
glVertex3f(-1.0f, 1.0f, -1.0f); // Top-Right of back face
glVertex3f(1.0f, 1.0f, -1.0f); // Top-Left of back face
// Left face
glColor3f(0.0f, 0.0f, 1.0f); // Blue
glVertex3f(-1.0f, 1.0f, 1.0f); // Top-Right of left face
glVertex3f(-1.0f, 1.0f, -1.0f); // Top-Left of left face
glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom-Left of left face
glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom-Right of left face
// Right face
glColor3f(1.0f, 0.0f, 1.0f); // Violet
glVertex3f(1.0f, 1.0f, 1.0f); // Top-Right of left face
glVertex3f(1.0f, 1.0f, -1.0f); // Top-Left of left face
glVertex3f(1.0f, -1.0f, -1.0f); // Bottom-Left of left face
glVertex3f(1.0f, -1.0f, 1.0f); // Bottom-Right of left face
glEnd();
glPopMatrix();
glTranslatef(-1.5f, -3.0f, 0.0f); // Back to center and lower screen
glPushMatrix();
glColor3f(1.0f, 1.0f, 0.0f); // Yellow
glutSolidSphere(1.0f, 16, 16); // Use GLUT to draw a solid sphere
glScalef(1.01f, 1.01f, 1.01f);
glColor3f(1.0f, 0.0f, 0.0f); // Red
glutWireSphere(1.0f, 16, 16); // Use GLUT to draw a wireframe sphere
glPopMatrix();
}
void initGlut(int argc, char* argv[]) {
std::cout << "Initialise OpenGL..." << std::endl;
glutInit(&argc, argv);
int iScreenWidth = glutGet(GLUT_SCREEN_WIDTH);
int iScreenHeight = glutGet(GLUT_SCREEN_HEIGHT);
glutInitDisplayMode(GLUT_RGBA | GLUT_ALPHA | GLUT_DOUBLE | GLUT_DEPTH);
glutInitWindowPosition(120, 120);
glutInitWindowSize(600, 600);
glutCreateWindow("OpenGL");
// Register GLUT callbacks
glutDisplayFunc(render);
// Setup initial GL State
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
glClearDepth(1.0f);
glShadeModel(GL_SMOOTH);
glutMainLoop();
std::cout << "Initialise OpenGL: Success!" << std::endl;
}
int _tmain(int argc, char* argv[])
{
initGlut(argc, argv);
return 0;
}
Hopefully someone with more experience will let me know what obvious thing I'm missing.