Introduction to OpenGL Programming - Korea...

Introduction to

OpenGL Programming

Jung Lee

Korea University Computer Graphics Lab.

Jung Lee | September 26, 2012 | # 2 KUCG |

OpenGL Reference Sites

• OpenGL Official Site

http://www.opengl.org/

• Khronos Group

http://www.khronos.org/

• Nehe Productions

http://nehe.gamedev.net/

http://www.opengl.org/

http://www.khronos.org/

http://nehe.gamedev.net/



OpenGL-Related Files

• Header File • gl.h, glaux.h, glu.h, glut.h

To the ‘include’ directory

• Static Library • opengl32.lib, glaux.lib, glu32.lib, glut32.lib

To the ‘lib’ directory

• Dynamic Library • opengl32.dll, glu32.dll, glut.dll, glut32.dll

C:\WINDOWS\system32



Project Creation [Visual Studio 6.0] (1/3)

• [File] [New] (Ctrl+N)

[Win32 Console Application]

Enter the project name [OK]

[An empty project] [Finish]




• [Project] [Settings] (Alt+F7)

[Link] Object/library modules

• Type ‘opengl32.lib glu32.lib glut32.lib glaux.lib’




• [File] [New] (Ctrl+N)

[C++ Source File]

Enter the main file name




• [File] [New] [Project] (Ctrl+Shift+N)

[Visual C++] [Win32] [Win32 Console App]

Enter the project name

[빈 프로젝트]




• [Project] [속성] (Alt+F7)

[구성 속성] [링커] [입력]

[추가 종속성]





• [소스 파일] 우클릭 [새 항목 추가]

[코드] [C++파일(.cpp)]

Enter the main file name [추가(A)]



Project Creation [Visual Studio 2008] (1/2)

• [File] [New] (Ctrl+Shift+N)

[Project types] [General]

[Templates] [Empty Project]

Enter the project file name




• [Project] [Settings…] (Alt+F7)

[Link] [Input] [Additional Dependencies]





• [File] [New] [Project] (Ctrl+Shift+N)

[Visual C++] [Win32] [Win32 Console App]

Enter the project name

[Empty project]




• [Project] [Properties] (Alt+F7)

[Configuration Properties] [Linker] [Input]

[Additional Dependencies]




Example

ex00_red_square_single.exe



OpenGL Primitives

• Point GL_POINTS

• Line GL_LINES

GL_LINE_STRIP

GL_LINE_LOOP

• Polygon GL_POLYGON

GL_TRIANGLES

GL_TRIANGLE_STRIP

GL_TRIANGLE_FAN

GL_QUAD_STRIP

• Miscellaneous

Cube

Tetrahedron

Icosahedron

Sphere

Torus

Cone



Point

• GL_POINTS

glBegin(GL_POINTS);

glVertex3f(v1x, v1y, v1z);




glEnd();

v1 v2

v3 v4



Line (1/3)

• GL_LINES

glBegin(GL_LINES);





glEnd();

v1 v2

v3 v4



Line (2/3)

• GL_LINE_STRIP

glBegin(GL_LINE_STRIP);





glEnd();

v1 v2

v3 v4



Line (3/3)

• GL_LINE_LOOP

glBegin(GL_LINE_LOOP);





glEnd();

v1 v2

v3 v4



Triangle (1/3)

• GL_TRIANGLES

glBegin(GL_TRIANGLES);




glEnd();

v1 v3

v2



Triangle (2/3)

• GL_TRIANGLE_STRIP

glBegin(GL_TRIANGLE_STRIP);






glEnd();

v1

v2

v3

v4

v5



Triangle (3/3)

• GL_TRIANGLE_FAN

glBegin(GL_TRIANGLE_FAN);






glEnd(); v1

v2

v3

v4 v5



Quadrilateral (1/2)

• GL_QUADS

glBegin(GL_QUADS);





glEnd();

v1 v4

v3 v2



Quadrilateral (2/2)

• GL_QUAD_STRIP

glBegin(GL_QUAD_STRIP);







glEnd();

v1

v2

v3

v4

v5

v6



Polygon

• GL_POLYGON

glBegin(GL_POLYGON);







glEnd();

v1

v2

v3 v4

v6

v5



Miscellaneous (1/3)

• Cube

void glutSolidCube(GLdouble size)

void glutWireCube(GLdouble size)

• Tetrahedron

void glutSolidTetrahedron(void)

void glutWireTetrahedron(void)

• Icosahedron

void glutSolidIcosahedron(void)

void glutWireIcosahedron(void)



Miscellaneous (2/3)

• Sphere

void glutSolidSphere(GLdouble radius, GLint

slices, GLint stacks)

void glutWireSphere(GLdouble radius, GLint

slices, GLint stacks)

• Torus

void glutSolidTorus(GLdouble innerRadius,

GLdouble outerRadius, GLint nsides, GLint rings)

void glutWireTorus(GLdouble innerRadius,

GLdouble outerRadius, GLint nsides, GLint rings)



Miscellaneous (3/3)

• Cone

void glutSolidCone(GLdouble base_radius,

GLdouble height, GLint slices, GLint stacks)

void glutWireCone(GLdouble base_radius,

GLdouble height, GLint slices, GLint stacks)

• Teapot

void glutSolidTeapot(GLdouble size)

void glutWireTeapot(GLdouble size)



Teapot Example

ex01_teapot.exe



Basic Functions (1/2)

• glPointSize(GLfloat size)

glGetFloatv(GL_POINT_SIZE_RANGE)

• Returns the range of the point size that the hardware supports

• glLineWidth(GLfloat width)

glGetFloatv(GL_LINE_WIDTH_RANGE)

• Returns the range of the line width that the hardware supports



Point Example

ex02_dot_circle.exe



Basic Functions (2/2)

• glShadeModel(mode)

Sets the polygon filling method

mode

• GL_FLAT

– By only one color

• GL_SMOOTH

– By the weighted averaging the colors of member vertices (gradation)

– Default value



Line Example

ex03_gouraud_line.exe



Triangle Example

ex04_gouraud_triangle.exe



Rectangle Example : Revisited

ex05_red_square_double.exe



‘Single vs. Double Buffering’ glFlush() vs. glutSwapBuffers()

• Single Buffering (GLUT_SINGLE, Default)

• Double Buffering (GLUT_DOUBLE)

cf.) triple buffering

Graphic Processor

Frame Buffer

Video Controller

Display Device

Graphic Processor

Front Buffer

Video Controller

Display Device

Back Buffer

Slow Very Fast

Introduction to OpenGL Programming - Korea...

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