Skip to main content

OpenGL


OpenGL is an interface to graphics hardware. The GL stands for Graphics Library. It provides commands for specifying geometric objects in two or three dimensions, and for controlling how these objects are drawn on the display. Objects, in this case, are points, lines, polygons, images, and bitmaps.

How to Install in Microsoft Visual Studio:
After downloading glut-3.7.6-bin.zip

  1. Copy all the .h files into the C:\Program Files\Microsoft SDKs\Windows\v6.1\Include\GL folder. This should be glut.h, freeglut.h, freeglut_ext.h, and freeglut_std.h.
  2. Copy all the .lib files into the C:\Program Files\Microsoft SDKs\Windows\v6.1\Lib folder. This should be freeglut.lib and glut32.lib.
  3. Copy all the .dll files into the C:\Windows\system32 folder. This should be freeglut.dll and glut32.dll.

For Details:
http://thoughtsfrommylife.com/article-748-OpenGL_and_Visual_Studio_Express_2008


My first Program

Open a c++ project in VS 2005/2008/2000
Select win32 Console Applocation
Click Finish.
Then Copy the program & Run it.
Let me know if u face any problem.

triangle.c

#include
/*
* triangle.c -- A simple example of OpenGL and GLUT.
*/

#include

void displayCB(void) /* function called whenever redisplay needed */
{
glClear(GL_COLOR_BUFFER_BIT); /* clear the display */
glColor3f(1.0, 1.0, 1.0); /* set current color to white */
glBegin(GL_POLYGON); /* draw filled triangle */
glVertex2i(200,125); /* specify each vertex of triangle */
glVertex2i(100,375);
glVertex2i(300,375);
glEnd(); /* OpenGL draws the filled triangle */
glFlush(); /* Complete any pending operations */
}

void keyCB(unsigned char key, int x, int y) /* called on key press */
{
if( key == 'q' ) exit(0);
}

int main(int argc, char *argv[])
{
int win;

glutInit(&argc, argv); /* initialize GLUT system */

glutInitDisplayMode(GLUT_RGB);
glutInitWindowSize(400,500); /* width=400pixels height=500pixels */
win = glutCreateWindow("Triangle"); /* create window */

/* from this point on the current window is win */

glClearColor(0.0,0.0,0.0,0.0); /* set background to black */
gluOrtho2D(0,400,0,500); /* how object is mapped to window */
glutDisplayFunc(displayCB); /* set window's display callback */
glutKeyboardFunc(keyCB); /* set window's key callback */

glutMainLoop(); /* start processing events... */

/* execution never reaches this point */

return 0;
}

Comments

Post a Comment

Popular posts from this blog

Creating dynamic email templates using C# and Office Outlook

It is quite common for many applications to send automated email notifications. Couple of months ago, I have worked on improving our old email template format to make it more user friendly . In this tutorial I will walk you though regarding how I took advantage of Microsoft Outlook to quickly generate custom email template and later using the html template for building an automated custom email application using C#. Steps: Creating Templates: Using the rich text editor support  in Outlook create a nicely formatted email. Use placeholder text for the values you like to change dynamically based on your task completion status. To keep this tutorial simple, I have created a  simple table with placeholder text inside the third bracket  [place holder text]. However, you can use anything supported by outlook editor. Figure: Email Template Getting HTML code: Send the created email to your own address. After that, open the sent email and right click to view source . It
5 comments
Read more

Why using XOR might not be a good hash code implementation?

Using XOR for computing hash codes works great for most of the cases specially when order of computation does not matter. It also has the following benefits: XOR has the best bit shuffling properties of all bit-operations and provides better distributions of hash values. It is a quick single cycle operation in most computer  Order of computation does not matter. i.e. a^b = b^a However, if ordering of elements matter then it is often not a good choice. Example For simplicity consider you have a class with two string properties named Prop1 and Prop2  and your GetHashCode returns the xor of their hash code. It will work fine for most of the cases except cases where same values are assigned to different properties. It will generate same hash-code i.e. collision in that case as can be seen in the below example . However, using the modified approach as recommenced by Joshua Bloch's in Effective Java which uses prime multiplication and hash chaining provides more unif
Post a Comment
Read more

SQL Performance improvement for User defined table types

Recently, I have dealt with an interesting performance issue with one of my SQL query and thought I will share the experience here. Context: We had a legacy stored procedure responsible for saving large amount of excel row data to our database tables. It was using   User Defined Table Types as one of the parameter to get a list of row data from excel. However, the stored procedure was taking very long time to save the large data set. Root Cause: After quite a bit of investigation using execution plan in SSMS, I was able to narrow down the performance issue to the following: Joining with User defined table type was taking >90 percent of the time A custom hash function which has been used multiple times as a join criteria was also quite expensive to compute. After doing additional research using stack overflow , I was able to figure out that the primary reason for the poor performance doing a  JOIN on Table Valued parameters is that : it does not keep statistics and a
Post a Comment
Read more