load_shaders.cxx

const char* vertShader = R"(
#version 150
uniform mat4 project;
uniform mat4 modelview;
in float x;
in float y;
in float z;

void main() {
	gl_Position = project * modelview * vec4(x, y, z, 1.0);
}
)"

const char* fragShader = R"(
#version 150
out vec4 gl_FragColor;

void main() {
	gl_FragColor = vec4(0.2, 1.0, 0.2, 1.0);
}
)"

GLenum loadShaderProgram(void) {
	// create handles for shader objects
	auto vert = glCreateShader(GL_VERTEX_SHADER);
	auto frag = glCreateShader(GL_FRAGMENT_SHADER);

	// load source strings
	glShaderSource(vert, 1, &vertShader, NULL);
	glShaderSource(frag, 1, &fragShader, NULL);

	// compile source into shader objects
	glCompileShader(vert);
	glCompileShader(frag);

	// create a handle for shading program
	auto program = glCreateProgram();

	// attach shader objects
	glAttachShader(program, vert);
	glAttachShader(program, frag);

	// link shader objects into a program
	glLinkProgram(program);

	// use fresh compiled program for rendering
	glUseProgram(program);

	return program;
}