tmpvar/opengl-learning.md

## opengl-learning.md

      
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              opengl-learning.md
            
          
    OpenGL

This is a notepad for my journey to learn opengl's programmable pipeline
Tutorials


http://www.arcsynthesis.org/gltut/Basics/Basics.html

Examples & Tutorials


http://learningwebgl.com/
http://www.opengl.org/wiki/VBO_-_just_examples
http://starstonesoftware.com/OpenGL/

Sections

Basics

Types

typedef unsigned int GLenum;
typedef unsigned char GLboolean;
typedef unsigned int GLbitfield;
typedef signed char GLbyte;
typedef short GLshort;
typedef int GLint;
typedef int GLsizei;
typedef unsigned char GLubyte;
typedef unsigned short GLushort;
typedef unsigned int GLuint;
typedef float GLfloat;
typedef float GLclampf;
typedef double GLdouble;
typedef double GLclampd;
typedef void GLvoid;

typedef long GLintptr;
typedef long GLsizeiptr;

Texturing


coords http://uploads.gamedev.net/monthly_06_2011/ccs-8549-0-98845200-1307472511_thumb.jpg

Q/A

Why do some of the examples I see have 4D's?

These are homogeneous coordinates : http://en.wikipedia.org/wiki/Homogeneous_coordinates
Why is only one pixel of my texture being rendered?

You need to enable the vertex attrib for the shader param that controls the texture.
GLint textureAttribute = glGetAttribLocation(program, name);
// ...
glEnableVertexAttribArray(textureAttribute);