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underscorediscovery
34
examples/SimpleOpenGL/project.nmml
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34
examples/SimpleOpenGL/project.nmml
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<?xml version="1.0" encoding="utf-8"?>
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<project>
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<meta
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title="NMEGL Example - Simple OpenGL"
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package="com.underscorediscovery.nmegl_example_simple"
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version="1.0.0"
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company="underscorediscovery"
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/>
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<app
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main="Main"
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path="bin"
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file="nmegl_example_simple"
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/>
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<window
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width="960"
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height="640"
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orientation="landscape"
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fps="60"
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background="0x161616"
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require_shaders="true"
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resizable="true"
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hardware="true"
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/>
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<assets path="Assets" rename="assets" include="*"/>
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<source path="src" />
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<haxelib name="nmegl" />
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</project>
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184
examples/SimpleOpenGL/src/Main.hx
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184
examples/SimpleOpenGL/src/Main.hx
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import nmegl.utils.Assets;
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import nmegl.NMEGL;
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//Import GL stuff from nme
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import nmegl.gl.GL;
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import nmegl.gl.GLBuffer;
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import nmegl.gl.GLProgram;
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//utils
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import nmegl.utils.Float32Array;
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import nmegl.geometry.Matrix3D;
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class Main {
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public var lib : NMEGL;
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//Shader stuff for drawing
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private var shaderProgram:GLProgram;
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private var vertexAttribute:Int;
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//The vertices are stored in here for GL
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private var vertexBuffer:GLBuffer;
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//Some value to mess with the clear color
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private var red_value : Float = 1.0;
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private var red_direction : Int = 1;
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public function new( _nmegl : NMEGL) {
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lib = _nmegl;
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//NOTE : You cannot do anything before creating the actual window, which will call ready() for you when it is done
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}
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public function ready() {
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// Init the shaders and view
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init();
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//Tell it to let us draw here
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lib.set_render_function( on_render );
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lib.set_update_function( on_update );
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}
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public function on_update() {
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//called each frame by NMEGL for logic (called before render)
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//an awful magic number to change the value slowly
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red_value += red_direction * 0.005;
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if(red_value >= 1) {
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red_value = 1;
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red_direction = -red_direction;
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} else if(red_value <= 0) {
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red_value = 0;
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red_direction = -red_direction;
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}
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}
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public function on_render() {
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//Set the viewport for GL
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GL.viewport( 0, 0, lib.config.width, lib.config.height );
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//Set the clear color to a weird color that bounces around
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GL.clearColor( red_value, red_value*0.5, red_value*0.3, 1);
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//Clear the buffers
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GL.clear( GL.COLOR_BUFFER_BIT | GL.DEPTH_BUFFER_BIT );
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//Work out the middle of the viewport
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var positionX = lib.config.width / 2;
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var positionY = lib.config.height / 2;
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//Create the projection and modelview matrices
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var projectionMatrix = Matrix3D.createOrtho (0, lib.config.width, lib.config.height, 0, 1000, -1000);
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var modelViewMatrix = Matrix3D.create2D (positionX, positionY, 1, 0);
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//Bind the shader pointers to the vertex GL Buffer we made in init
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GL.bindBuffer (GL.ARRAY_BUFFER, vertexBuffer);
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GL.vertexAttribPointer (vertexAttribute, 3, GL.FLOAT, false, 0, 0);
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//Set the projection values in the shader so they can render accordingly
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var projectionMatrixUniform = GL.getUniformLocation (shaderProgram, "projectionMatrix");
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var modelViewMatrixUniform = GL.getUniformLocation (shaderProgram, "modelViewMatrix");
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//Update the GL Matrices
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GL.uniformMatrix3D (projectionMatrixUniform, false, projectionMatrix);
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GL.uniformMatrix3D (modelViewMatrixUniform, false, modelViewMatrix);
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//And finally, Draw the vertices with the applied shaders and view
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GL.drawArrays (GL.TRIANGLE_STRIP, 0, 4);
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}
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public function init() {
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//Set up shaders
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createProgram();
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//Create a set of vertices
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var vertices = [
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100, 100, 0,
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-100, 100, 0,
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100, -100, 0,
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-100, -100, 0
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];
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//Create a buffer from OpenGL
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vertexBuffer = GL.createBuffer ();
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//Bind it
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GL.bindBuffer (GL.ARRAY_BUFFER, vertexBuffer);
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//Point it to the vertex array!
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GL.bufferData (GL.ARRAY_BUFFER, new Float32Array (vertices), GL.STATIC_DRAW);
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}
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//Shader initialize
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private function createProgram ():Void {
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var vertexShaderSource =
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"attribute vec3 vertexPosition;
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uniform mat4 modelViewMatrix;
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uniform mat4 projectionMatrix;
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void main(void) {
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gl_Position = projectionMatrix * modelViewMatrix * vec4(vertexPosition, 1.0);
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}";
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var vertexShader = GL.createShader (GL.VERTEX_SHADER);
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GL.shaderSource (vertexShader, vertexShaderSource);
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GL.compileShader (vertexShader);
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if (GL.getShaderParameter (vertexShader, GL.COMPILE_STATUS) == 0) {
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throw "Error compiling vertex shader";
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}
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var fragmentShaderSource =
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"void main(void) {
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gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
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}";
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var fragmentShader = GL.createShader (GL.FRAGMENT_SHADER);
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GL.shaderSource (fragmentShader, fragmentShaderSource);
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GL.compileShader (fragmentShader);
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if (GL.getShaderParameter (fragmentShader, GL.COMPILE_STATUS) == 0) {
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throw "Error compiling fragment shader";
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}
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shaderProgram = GL.createProgram ();
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GL.attachShader (shaderProgram, vertexShader);
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GL.attachShader (shaderProgram, fragmentShader);
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GL.linkProgram (shaderProgram);
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if (GL.getProgramParameter (shaderProgram, GL.LINK_STATUS) == 0) {
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throw "Unable to initialize the shader program.";
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}
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GL.useProgram (shaderProgram);
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vertexAttribute = GL.getAttribLocation (shaderProgram, "vertexPosition");
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GL.enableVertexAttribArray (vertexAttribute);
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}
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}
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