3D Modelling with OpenGL

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3D Modelling with OpenGL

• Brian Farrimond
• Robina Hetherington

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Schedule
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Todays class

• Programming in C
• Using .NET Visual C
• Compiling Linking Building a program
• C programming with OpenGL
• Computer Graphics
• A first OpenGL program

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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

Include information about the standard library
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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

A C function. Its name is main
A C program consists of a collection of functions
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Programming in C

• A C function consists of
• a header line
• a body made up of statements enclosed by and

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

This is where the program actually starts.
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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

Every C program has a main function
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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

printf is a library function to print characters
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Programming in C

• The Hello world program
• / hello.cpp /
• include ltstdio.hgt
• int main()
• printf(hello, world\n)
• return 0

Return from the main function i.e. end the
program
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.NET Visual C

• Microsofts C programming environment
• Program code is placed inside a .NET project
• .NET builds the program (or application) with
  this project
• We shall build a console application (as opposed
  to a Windows application)

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Using .NET

• Copy the folder
• dotNetExamples\hello
• from the CD to your disc space
• Launch .NET
• Open the hello project using File Open and
  navigate to hello.sln inside the hello folder

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Exploring the hello project

• Solution tree

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Exploring the hello project

• Solution tree
• Double click on hello.cpp to see the program code

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Hello.cpp
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Building the program

• To build the program, select the menu item
• Build Build Solution

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Running the program

• To run the program, select menu item
• Debug Start

Or use this button
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Use of getchar()

• Without getchar() the program terminates at once
  before we can see what printf has done
• getchar() pauses the program until we press the
  return key.

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Exercises

• Modify the text inside the printf statement
• Modify the program so that it prints out
• One
• Two
• Three

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Building Compiling linking

• Building is a two stage process
• Compiling source code into object code
• Linking object code and library code to produce
  the program (known as the executable)

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More on Building

• See using dotNET IDE in C page 16

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Separate compilation

• Large programs are made up of many source files
• Each file compiled separately
• Advantages
• Changing the code of one file does not require
  recompiling the entire program
• Team of programmers can work on different files

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Multifile example
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The multifile .NET project

• Copy the folder
• dotNetExamples\multifile
• from the CD to your disc space
• Open the project using
• File Open
• Examine the solution tree

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The multifile .NET project

• Build and run the program
• Edit func2.cpp so that it prints out
• This is the new func 2
• Rebuild and rerun the program