oglplusのミニマムコード modified official example "standalone/001_triangle_glut_glew.cpp"

gistfile1.cpp

#include <iostream>
#include <GL/glew.h>
#include <GL/glut.h>
#include <oglplus/all.hpp>

oglplus::Context* gl;

void Display(void);

int main(int argc, char* argv[]){
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH);
	glutInitWindowSize(800, 600);
	glutInitWindowPosition(100, 100);
	glutCreateWindow("OGLplus+GLUT+GLEW");

	if(glewInit() == GLEW_OK){

		// Get OpenGL Context.
		// This should be put AFTER glewInit().
		gl = new oglplus::Context();

		// Compile vertex shader
		oglplus::VertexShader vs;
		vs.Source(
				"#version 330\n"
				"in vec3 Position;"
				"void main(void){"
				"gl_Position = vec4(Position, 1.0);"
				"}"
				);
		vs.Compile();

		// Compile fragment shader
		oglplus::FragmentShader fs;
		fs.Source(
				"#version 330\n"
				"out vec4 fragColor;"
				" void main(void){"
				"fragColor = vec4(1.0, 0.0, 0.0, 1.0);"
				"}"
				);
		fs.Compile();

		// Generate shader program object
		oglplus::Program prog;
		prog.AttachShader(vs);
		prog.AttachShader(fs);
		prog.Link();
		prog.Use();

		// VAO
		oglplus::VertexArray triangle;
		triangle.Bind();

		// VBO
		oglplus::Buffer verts;
		verts.Bind(oglplus::Buffer::Target::Array);
		GLfloat triangle_verts[9] = {
				0.0f, 0.0f, 0.0f,
				1.0f, 0.0f, 0.0f,
				0.0f, 1.0f, 0.0f
		};
		oglplus::Buffer::Data(
				oglplus::Buffer::Target::Array,
				9,
				triangle_verts
				);
		oglplus::VertexArrayAttrib vert_attr(prog, "Position");
		vert_attr.Setup<GLfloat>(3);
		vert_attr.Enable();

		gl->ClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		gl->ClearDepth(1.0f);

		glutDisplayFunc(Display);
		glutMainLoop();
		return 0;
	}
	return 1;
}

void Display(void){
	gl->Clear().ColorBuffer().DepthBuffer();
	gl->DrawArrays(oglplus::PrimitiveType::Triangles, 0, 3);
	glutSwapBuffers();
}