/// <summary>
/// Initialises the scene.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
/// <param name="width">The width of the screen.</param>
/// <param name="height">The height of the screen.</param>
public void Initialise(OpenGL gl, float width, float height)
{
// Set a blue clear colour.
gl.ClearColor(0.4f, 0.6f, 0.9f, 0.5f);
{
// Create the shader program.
var vertexShaderSource = ManifestResourceLoader.LoadTextFile("Shader.vert");
var fragmentShaderSource = ManifestResourceLoader.LoadTextFile("Shader.frag");
var shaderProgram = new ShaderProgram();
shaderProgram.Create(gl, vertexShaderSource, fragmentShaderSource, null);
shaderProgram.BindAttributeLocation(gl, attributeIndexPosition, "in_Position");
shaderProgram.BindAttributeLocation(gl, attributeIndexColour, "in_Color");
shaderProgram.AssertValid(gl);
this.shaderProgram = shaderProgram;
}
{
// Create the shader program.
var vertexShaderSource = ColorCodedPickingShaderHelper.GetShaderSource(ColorCodedPickingShaderHelper.ShaderTypes.VertexShader);
var fragmentShaderSource = ColorCodedPickingShaderHelper.GetShaderSource(ColorCodedPickingShaderHelper.ShaderTypes.FragmentShader);
var shaderProgram = new ShaderProgram();
shaderProgram.Create(gl, vertexShaderSource, fragmentShaderSource, null);
shaderProgram.BindAttributeLocation(gl, attributeIndexPosition, "in_Position");
shaderProgram.BindAttributeLocation(gl, attributeIndexColour, "in_Color");
shaderProgram.AssertValid(gl);
this.pickingShaderProgram = shaderProgram;
}
// Create a perspective projection matrix.
const float rads = (60.0f / 360.0f) * (float)Math.PI * 2.0f;
projectionMatrix = glm.perspective(rads, width / height, 0.1f, 100.0f);
// Create a view matrix to move us back a bit.
viewMatrix = glm.translate(new mat4(1.0f), new vec3(0.0f, 0.0f, -5.0f));
// Create a model matrix to make the model a little bigger.
modelMatrix = glm.scale(new mat4(1.0f), new vec3(2.5f));
IPerspectiveCamera camera = this.cameraRotation.Camera;
projectionMatrix = camera.GetProjectionMat4();
viewMatrix = this.cameraRotation.Camera.GetViewMat4();
modelMatrix = mat4.identity();
// Now create the geometry for the square.
CreateVertices(gl);
}
/// <summary>
/// Draws the scene.
/// </summary>
/// <param name="gl">The OpenGL instance.</param>
public void Draw(OpenGL gl, RenderMode renderMode = RenderMode.Render)
{
var shader = (renderMode == RenderMode.HitTest) ? pickingShaderProgram : shaderProgram;
if (renderMode == RenderMode.HitTest)
{
gl.ClearColor(1, 1, 1, 1);
}
else
{
// Set a blue clear colour.
gl.ClearColor(0.4f, 0.6f, 0.9f, 0.5f);
}
// Clear the scene.
gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT | OpenGL.GL_STENCIL_BUFFER_BIT);
gl.PointSize(3);
// Update matrices.
IPerspectiveCamera camera = this.cameraRotation.Camera;
projectionMatrix = camera.GetProjectionMat4();
viewMatrix = this.cameraRotation.Camera.GetViewMat4();
modelMatrix = mat4.identity();
// Bind the shader, set the matrices.
shader.Bind(gl);
shader.SetUniformMatrix4(gl, "projectionMatrix", projectionMatrix.to_array());
shader.SetUniformMatrix4(gl, "viewMatrix", viewMatrix.to_array());
shader.SetUniformMatrix4(gl, "modelMatrix", modelMatrix.to_array());
// Bind the out vertex array.
vertexBufferArray.Bind(gl);
// Draw the square.
//gl.DrawArrays(OpenGL.GL_TRIANGLES, 0, vertices.Length);
gl.DrawArrays(OpenGL.GL_POINTS, 0, vertices.Length);
// Unbind our vertex array and shader.
vertexBufferArray.Unbind(gl);
shader.Unbind(gl);
gl.Flush();
}