Hello Triangle: An OpenGL ES 3.0 Example - Praise for OpenGL ES 30 Programming Guide - page 31

Example 2-1 Hello_Triangle.c Example (continued)

" gl_Position = vPosition; \n"
"} \n";

char fShaderStr[] =
"#version 300 es \n"
"precision mediump float; \n"
"out vec4 fragColor; \n"
"void main() \n"
"{ \n"
" \n"

"} \n";

fragColor = vec4 ( 1.0, 0.0, 0.0, 1.0 );

GLuint vertexShader;
GLuint fragmentShader;
GLuint programObject;
GLint linked;

// Load the vertex/fragment shaders
vertexShader = LoadShader ( GL_VERTEX_SHADER, vShaderStr );
fragmentShader = LoadShader ( GL_FRAGMENT_SHADER, fShaderStr );

// Create the program object
programObject = glCreateProgram ( );

if ( programObject == 0 )
return 0;

glAttachShader ( programObject, vertexShader );
glAttachShader ( programObject, fragmentShader );

// Link the program
glLinkProgram ( programObject );

// Check the link status
glGetProgramiv ( programObject, GL_LINK_STATUS, &linked );

if ( !linked )
{
GLint infoLen = 0;

glGetProgramiv ( programObject, GL_INFO_LOG_LENGTH, &infoLen );

if ( infoLen > 1 )
{
char* infoLog = malloc (sizeof(char) * infoLen );

glGetProgramInfoLog ( programObject, infoLen, NULL, infoLog );
(continues)