protected override void OnRenderFrame(FrameEventArgs e)
{
base.OnRenderFrame(e);
// set up viewport
GL.Viewport(0, 0, Size.X, Size.Y);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// determinate object view rotation vectors and apply them
_objectView = _baseView;
var rotation = _rotateVectors[_rotateIndex];
if (rotation != Vector3.Zero)
{
_objectView *= Matrix4.CreateFromAxisAngle(_rotateVectors[_rotateIndex], (float)(_stopwatch.Elapsed.TotalSeconds * 1.0));
}
// set transformation matrix
_textureProgram.Use();
_textureProgram.ModelViewProjectionMatrix.Set(_objectView * ActiveCamera.ViewProjectionMatrix);
_cube.Draw();
// swap buffers
SwapBuffers();
}
protected override void OnRenderFrame(FrameEventArgs e)
{
// set up viewport
GL.Viewport(0, 0, Size.X, Size.Y);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
SetupPerspective();
// determinate object view rotation vectors and apply them
_objectView = _baseView;
var rotation = _rotateVectors[_rotateIndex];
if (rotation != Vector3.Zero)
{
_objectView *= Matrix4.CreateFromAxisAngle(_rotateVectors[_rotateIndex], (float)(_stopwatch.Elapsed.TotalSeconds * 1.0));
}
// set transformation matrix
_textureProgram.Use();
_textureProgram.ModelViewProjectionMatrix.Set(_objectView * ModelView * Projection);
// render cube with texture
_cubeVao.Bind();
_cubeVao.DrawArrays(_cube.DefaultMode, 0, _cube.VertexBuffer.ElementCount);
// swap buffers
SwapBuffers();
}
protected override void OnRenderFrame(FrameEventArgs e)
{
base.OnRenderFrame(e);
// set up render to texture
_framebuffer.Bind(FramebufferTarget.Framebuffer);
GL.Viewport(0, 0, FramebufferWidth, FramebufferHeight);
GL.ClearColor(Color.Black);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// render rotating cube to texture
_colorProgram.Use();
_colorProgram.ModelViewProjectionMatrix.Set(
Matrix4.CreateRotationX((float)FrameTimer.TimeRunning / 1000)
* Matrix4.CreateRotationY((float)FrameTimer.TimeRunning / 1000)
* Matrix4.CreateTranslation(0, 0, -5)
* Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, FramebufferWidth / (float)FramebufferHeight, 0.1f, 100));
_cube.Draw();
// reset to default framebuffer
Framebuffer.Unbind(FramebufferTarget.Framebuffer);
// set up viewport for the window
GL.Viewport(0, 0, Size.X, Size.Y);
GL.ClearColor(Color.MidnightBlue);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// render quad with texture
_textureProgram.Use();
_textureProgram.ModelViewProjectionMatrix.Set(ActiveCamera.ViewProjectionMatrix);
_quad.Draw();
// swap buffers
SwapBuffers();
}
private void OnRenderFrame(object sender, FrameEventArgs e)
{
// set up render to texture
_framebuffer.Bind(FramebufferTarget.Framebuffer);
GL.Viewport(0, 0, FramebufferWidth, FramebufferHeight);
GL.ClearColor(Color.Black);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// render rotating cube to texture
_colorProgram.Use();
_colorProgram.ModelViewProjectionMatrix.Set(
Matrix4.CreateRotationX((float)FrameTimer.TimeRunning / 1000)
* Matrix4.CreateRotationY((float)FrameTimer.TimeRunning / 1000)
* Matrix4.CreateTranslation(0, 0, -5)
* Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4, FramebufferWidth / (float)FramebufferHeight, 0.1f, 100));
_cubeVao.Bind();
_cubeVao.DrawElements(PrimitiveType.Triangles, _cube.IndexBuffer.ElementCount);
// reset to default framebuffer
Framebuffer.Unbind(FramebufferTarget.Framebuffer);
// set up viewport for the window
GL.Viewport(0, 0, Width, Height);
GL.ClearColor(Color.MidnightBlue);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
SetupPerspective();
// render quad with texture
_textureProgram.Use();
_textureProgram.ModelViewProjectionMatrix.Set(ModelView * Projection);
_quadVao.Bind();
_quadVao.DrawArrays(PrimitiveType.TriangleStrip, 0, _quad.VertexBuffer.ElementCount);
// swap buffers
SwapBuffers();
}
private void OnLoad(object sender, EventArgs e)
{
// load texture from file
using (var bitmap = new Bitmap("Data/Textures/checker.jpg"))
{
BitmapTexture.CreateCompatible(bitmap, out _texture);
_texture.LoadBitmap(bitmap);
}
_texture.GenerateMipMaps();
// initialize sampler
_sampler = new Sampler();
_sampler.SetWrapMode(TextureWrapMode.Repeat);
// create vertex data for a big plane
const int a = 10;
const int b = 10;
var vertices = new[]
{
new Vertex(-a, 0, -a, 0, 0),
new Vertex(a, 0, -a, b, 0),
new Vertex(-a, 0, a, 0, b),
new Vertex(a, 0, a, b, b)
};
// create buffer object and upload vertex data
_vbo = new Buffer <Vertex>();
_vbo.Init(BufferTarget.ArrayBuffer, vertices);
// initialize shader
_program = ProgramFactory.Create <SimpleTextureProgram>();
// activate shader program
_program.Use();
// bind sampler
_sampler.Bind(TextureUnit.Texture0);
// bind texture
_program.Texture.BindTexture(TextureUnit.Texture0, _texture);
// which is equivalent to
//_program.Texture.Set(TextureUnit.Texture0);
//_texture.Bind(TextureUnit.Texture0);
// set up vertex array and attributes
_vao = new VertexArray();
_vao.Bind();
// memory layout of our data is XYZUVXYZUV...
// the buffer abstraction knows the total size of one "pack" of vertex data
// and if a vertex attribute is bound without further arguments the first N elements are taken from each pack
// where N is provided via the VertexAttribAttribute on the program property:
_vao.BindAttribute(_program.InPosition, _vbo);
// if data should not be taken from the start of each pack, the offset must be given in bytes
// to reach the texture coordinates UV the XYZ coordinates must be skipped, that is 3 floats, i.e. an offset of 12 bytes is needed
_vao.BindAttribute(_program.InTexCoord, _vbo, 12);
// if needed all the available arguments can be specified manually, e.g.
//_vao.BindAttribute(_program.InTexCoord, _vbo, 2, VertexAttribPointerType.Float, Marshal.SizeOf(typeof(Vertex)), 12, false);
// set default camera
Camera.DefaultState.Position = new Vector3(0, 0.5f, 3);
Camera.ResetToDefault();
// set a nice clear color
GL.ClearColor(Color.MidnightBlue);
}