OpenGL 4 Shading Language Cookbook - Third Edition

How to do it...

To compile a shader, use the following steps:

1. Create the shader object:

GLuint vertShader = glCreateShader( GL_VERTEX_SHADER ); 
if( 0 == vertShader ) { 
  std::cerr << "Error creating vertex shader." << std::endl;
  exit(EXIT_FAILURE); 
} 

2. Copy the source code into the shader object:

std::string shaderCode = loadShaderAsString("basic.vert.glsl"); 
const GLchar * codeArray[] = { shaderCode.c_str() }; 
glShaderSource( vertShader, 1, codeArray, NULL ); 

3. Compile the shader:

glCompileShader( vertShader );

4. Verify the compilation status:

GLint result; 
glGetShaderiv( vertShader, GL_COMPILE_STATUS, &result ); 
if( GL_FALSE == result ) { 
  std::cerr << "Vertex shader compilation failed!" << std::endl;
  // Get and print the info log GLint ...