OGLplus (0.52.0) a C++ wrapper for OpenGL

oglplus/001_triangle_glsl120.cpp

Shows the basic usage of OGLplus by drawing a blue triangle (using GLSL 120).

001_triangle_glsl120.png

Copyright 2008-2013 Matus Chochlik. Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

#include <oglplus/gl.hpp>
#include <oglplus/all.hpp>
#include "example.hpp"
namespace oglplus {
class TriangleExample : public Example
{
private:
// wrapper around the current OpenGL context
Context gl;
// Vertex shader
// Fragment shader
// Program
Program prog;
// A vertex array object for the rendered triangle
VertexArray triangle;
// VBO for the triangle's vertices
Buffer verts;
public:
TriangleExample(void)
{
// Set the vertex shader source and compile it
vs.Source(StrCRef(" \
#version 120\n \
attribute vec3 Position; \
void main(void) \
{ \
gl_Position = vec4(Position, 1.0); \
} \
")).Compile();
// set the fragment shader source and compile it
fs.Source(StrCRef(" \
#version 120\n \
void main(void) \
{ \
gl_FragColor = vec4(0.0, 0.0, 1.0, 1.0); \
} \
")).Compile();
// attach the shaders to the program
prog.AttachShader(vs).AttachShader(fs);
// link and use it
prog.Link().Use();
// bind the VAO for the triangle
triangle.Bind();
GLfloat triangle_verts[9] = {
0.0f, 0.0f, 0.0f,
1.0f, 0.0f, 0.0f,
0.0f,-1.0f, 0.0f
};
// bind the VBO for the triangle vertices
verts.Bind(Buffer::Target::Array);
// upload the data
// since triangle_vertices is a static array
// it is not necessary to specify its element count
Buffer::Data(Buffer::Target::Array, triangle_verts);
// setup the vertex attribs array for the vertices
(prog|"Position").Setup<Vec3f>().Enable();
gl.ClearColor(0.5f, 0.5f, 0.5f, 0.0f);
gl.Disable(Capability::DepthTest);
}
void Reshape(GLuint width, GLuint height)
{
gl.Viewport(width, height);
}
void Render(double)
{
gl.Clear().ColorBuffer();
gl.DrawArrays(PrimitiveType::Triangles, 0, 3);
}
};
void setupExample(ExampleParams& /*params*/){ }
std::unique_ptr<ExampleThread> makeExampleThread(
Example& /*example*/,
unsigned /*thread_id*/,
const ExampleParams& /*params*/
){ return std::unique_ptr<ExampleThread>(); }
std::unique_ptr<Example> makeExample(const ExampleParams& /*params*/)
{
return std::unique_ptr<Example>(new TriangleExample);
}
} // namespace oglplus

Copyright © 2010-2014 Matúš Chochlík, University of Žilina, Žilina, Slovakia.
<matus.chochlik -at- fri.uniza.sk>
<chochlik -at -gmail.com>
Documentation generated on Mon Sep 22 2014 by Doxygen (version 1.8.6).