https://github.com/evanw/gl

A small C++ library for working with OpenGL
https://github.com/evanw/gl

Last synced: about 2 months ago
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A small C++ library for working with OpenGL

• Host: GitHub
• URL: https://github.com/evanw/gl
• Owner: evanw
• Created: 2013-07-05T02:19:38.000Z (almost 12 years ago)
• Default Branch: master
• Last Pushed: 2013-07-05T02:29:45.000Z (almost 12 years ago)
• Last Synced: 2025-04-11T00:12:41.728Z (about 2 months ago)
• Language: C++
• Size: 98.6 KB
• Stars: 24
• Watchers: 3
• Forks: 7
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Introduction

This library provides simple C++ wrappers around some OpenGL functionality. It was modified from an [OpenGL 4 library](https://github.com/evanw/gl4) created for the [Advanced GPU Programming](http://cs.brown.edu/courses/cs195v/) course at Brown University.

## Example

    #ifdef __APPLE_CC__

    #include 

    #else

    #include 

    #endif

    #include "gl.h"

    Shader shader;

    Buffer quad;

    VAO layout;

    void setup() {

        shader.vertexShader(glsl(

            attribute vec2 vertex;

            varying vec2 coord;

            void main() {

                coord = vertex * 0.5 + 0.5;

                gl_Position = vec4(vertex, 0.0, 1.0);

            }

        )).fragmentShader(glsl(

            varying vec2 coord;

            void main() {

                gl_FragColor = vec4(coord, 0.0, 1.0);

            }

        )).link();

        quad << vec2(-1, -1) << vec2(1, -1) << vec2(-1, 1) << vec2(1, 1);

        quad.upload();

        layout.create(shader, quad).attribute("vertex", 2).check();

    }

    void draw() {

        glClear(GL_COLOR_BUFFER_BIT);

        shader.use();

        layout.draw(GL_TRIANGLE_STRIP);

        shader.unuse();

        glutSwapBuffers();

    }

    int main(int argc, char *argv[]) {

        glutInit(&argc, argv);

        glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);

        glutCreateWindow("Example");

        glutReshapeWindow(800, 600);

        glutDisplayFunc(draw);

        setup();

        glutMainLoop();

        return 0;

    }