public virtual void SetupVertexAttribs(IReadOnlyList <VertexFormatDescriptor> desc)
{
vao.Bind();
uint vertexSize = 0;
for (int count = desc.Count, i = 0; i < count; i++)
{
vertexSize += desc[i].ComponentCount * desc[i].ComponentSize;
}
uint index = 0;
uint offset = 0;
for (int count = desc.Count, i = 0; i < count; i++)
{
var e = desc[i];
uint type = uint.MaxValue;
if (!e.IsFloat)
{
if (e.ComponentSize == 4)
{
type = e.IsSigned ? GL_INT : GL_UNSIGNED_INT;
}
else if (e.ComponentSize == 2)
{
type = e.IsSigned ? GL_SHORT : GL_UNSIGNED_SHORT;
}
else if (e.ComponentSize == 1)
{
type = e.IsSigned ? GL_BYTE : GL_UNSIGNED_BYTE;
}
}
else
{
if (e.ComponentSize == 4)
{
type = GL_FLOAT;
}
else if (e.ComponentSize == 8)
{
type = GL_DOUBLE;
}
}
Debug.Assert(type != uint.MaxValue);
vao.SetVertexAttrib(index, vertexBuffer, (int)e.ComponentCount, (DataType)type, true, (int)vertexSize, offset);
offset += e.ComponentSize * e.ComponentCount;
index++;
}
}
public override void Start()
{
this.EnableDraw(true); // set to be rendered
map = new NoiseMap(0, size);
vao = new VertexArray();
vbo = GenVertices();
vao.Bind(vbo, OpenTK.Graphics.OpenGL4.BufferTarget.ArrayBuffer);
vao.AttributePointer(0, 3, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 6, 0);
vao.AttributePointer(1, 3, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 6, sizeof(float) * 3);
ebo = GenIndices();
vao.Bind(ebo, OpenTK.Graphics.OpenGL4.BufferTarget.ElementArrayBuffer);
}
public override void Start()
{
base.Start();
vbo = Primitive.Plane;
ebo = Primitive.PlaneIndices;
vao = new VertexArray();
vao.Bind(vbo, OpenTK.Graphics.OpenGL4.BufferTarget.ArrayBuffer);
vao.Bind(ebo, OpenTK.Graphics.OpenGL4.BufferTarget.ElementArrayBuffer);
vao.AttributePointer(0, 3, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 8, 0);
vao.AttributePointer(1, 3, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 8, sizeof(float) * 5);
vao.AttributePointer(2, 2, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 8, sizeof(float) * 3);
}
public void DrawDirectionalLight(Vector3 eyePosition, DirectionalLight light)
{
_directionalProgram.Use();
_directionalProgram.ModelViewProjectionMatrix.Set(Matrix4.Identity);
_directionalProgram.EyePosition.Set(eyePosition);
// set light properties
_directionalProgram.LightDirection.Set(light.Direction);
_directionalProgram.LightColor.Set(light.Color);
_directionalProgram.AmbientIntensity.Set(light.AmbientIntensity);
_directionalProgram.DiffuseIntensity.Set(light.DiffuseIntensity);
_gbuffer.BindBuffers(_directionalProgram);
// draw fullscreen quad
_vaoFullScreenQuad.Bind();
_vaoFullScreenQuad.DrawArrays(_quad.DefaultMode, 0, _quad.Vertices.Length);
}
public void Render(VertexArray vao, int indiceCount, RenderData data, IResourceProvider provider)
{
foreach (KeyValuePair <int, Texture> pair in textures) // Bind textures
{
pair.Value.Bind(pair.Key);
}
BindFrameBufferTextures(provider, true);
{
shader.Bind();
{
SetUniformValues(data);
vao.Bind();
{
GL.DrawElements(PrimitiveType.Triangles, indiceCount, DrawElementsType.UnsignedInt, 0);
}
vao.Unbind();
}
shader.Unbind();
}
BindFrameBufferTextures(provider, false);
foreach (Texture texture in textures.Values)
{
texture.Unbind();
}
}
public override void Draw(float time)
{
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
_time += goBack ? -time : time;
Lamp.Shader.Use();
Lamp.Shader.SetMatrix4("model", Matrix4.Identity);
Lamp.Shader.SetMatrix4("view", Camera.View);
Lamp.Shader.SetMatrix4("projection", Camera.Projection);
Lamp.Shader.SetVector3("objectColor", Lamp.Position);
Lamp.Shader.SetVector3("lightColor", new Vector3(_time));
Lamp.Shader.SetFloat("time", _time);
Lamp.Shader.SetVector3("viewPos", Camera.Position);
Lamp.Shader.SetVector3("lightPos", Lamp.Position);
Lamp.Bind();
GL.DrawArrays(PrimitiveType.Triangles, 0, 36);
_modelShader.Use();
var lampMatrix = Matrix4.Identity;
lampMatrix *= Matrix4.CreateScale(0.5f);
lampMatrix *= Matrix4.CreateTranslation(Lamp.Position) * Matrix4.CreateRotationY((Lamp.Position * _time).X);
_modelShader.SetMatrix4("model", lampMatrix);
_modelShader.SetMatrix4("view", Camera.View);
_modelShader.SetMatrix4("projection", Camera.Projection);
_modelVao.Bind();
GL.DrawArrays(PrimitiveType.Triangles, 0, 36);
if (_time >= 360.0f || _time < 0.0f)
{
goBack = !goBack;
}
base.Draw(time);
}
private void OnLoad(object sender, EventArgs e)
{
// initialize shader
_program = ProgramFactory.Create<SkyboxProgram>();
// initialize cube shape
_cube = new Cube();
_cube.UpdateBuffers();
// initialize vertex array and attributes
_vao = new VertexArray();
_vao.Bind();
_vao.BindAttribute(_program.InPosition, _cube.VertexBuffer);
_vao.BindElementBuffer(_cube.IndexBuffer);
// create cubemap texture and load all faces
for (var i = 0; i < 6; i++)
{
using (var bitmap = new Bitmap(string.Format("Data/Textures/city{0}.jpg", i)))
{
bitmap.RotateFlip(RotateFlipType.RotateNoneFlipX);
if (_skybox == null) BitmapTexture.CreateCompatible(bitmap, out _skybox, 1);
_skybox.LoadBitmap(bitmap, i);
}
}
// activate shader and bind texture to it
_program.Use();
_program.Texture.BindTexture(TextureUnit.Texture0, _skybox);
// enable seamless filtering to reduce artifacts at the edges of the cube faces
GL.Enable(EnableCap.TextureCubeMapSeamless);
// cull front faces because we are inside the cube
// this is not really necessary but removes some artifacts when the user leaves the cube
// which should be impossible for a real skybox, but in this demonstration it is possible by zooming out
GL.Enable(EnableCap.CullFace);
GL.CullFace(CullFaceMode.Front);
// set a nice clear color
GL.ClearColor(Color.MidnightBlue);
}
private void OnLoad(object sender, EventArgs e)
{
// maximize window
WindowState = WindowState.Maximized;
// load program
_programOdd = ProgramFactory.Create <GeodesicProgramOdd>();
_programEqual = ProgramFactory.Create <GeodesicProgram>();
_program = _programOdd;
// create icosahedron and set model matrix
_modelMatrix = Matrix4.CreateScale(1);
_icosahedron = new Icosahedron(5);
_icosahedron.UpdateBuffers();
// bind it to an vao
_vao = new VertexArray();
_vao.Bind();
_vao.BindElementBuffer(_icosahedron.IndexBuffer);
_vao.BindAttribute(_program.Position, _icosahedron.VertexBuffer);
// set some reasonable default state
GL.ClearColor(Color4.Black);
GL.Enable(EnableCap.DepthTest);
// backface culling is done in the tesselation control shader
GL.Enable(EnableCap.CullFace);
GL.CullFace(CullFaceMode.Back);
GL.PatchParameter(PatchParameterInt.PatchVertices, 3);
// lighting stuff
_deferredRenderer = new DeferredRenderer();
// enable controls
_variableHandler.Enable(this);
}
private void OnLoad(object sender, EventArgs e)
{
// initialize shader (load sources, create/compile/link shader program, error checking)
// when using the factory method the shader sources are retrieved from the ShaderSourceAttributes
_program = ProgramFactory.Create <ExampleProgram>();
// this program will be used all the time so just activate it once and for all
_program.Use();
// create vertices for a triangle
var vertices = new[] { new Vector3(-1, -1, 0), new Vector3(1, -1, 0), new Vector3(0, 1, 0) };
// create buffer object and upload vertex data
_vbo = new Buffer <Vector3>();
_vbo.Init(BufferTarget.ArrayBuffer, vertices);
// create and bind a vertex array
_vao = new VertexArray();
_vao.Bind();
// set up binding of the shader variable to the buffer object
_vao.BindAttribute(_program.InPosition, _vbo);
// set camera position
Camera.DefaultState.Position = new Vector3(0, 0, 3);
Camera.ResetToDefault();
// set a nice clear color
GL.ClearColor(Color.MidnightBlue);
}
/*
* public static Program GenerateProgram(Dictionary<ShaderType, Shader.Shader> shaderList)
* {
* Program program = new Program(shaderList);
* shaderList.Clear();
* return program;
* } //for each group of shaders, put that into a loop within some xml loading function, xml passed from Main
*/
public static void Draw()
{
//todo: everything, clean up
//this is going to consist of several other methods, skybox pass, normal pass, hud pass, post process pass etc
//TODO: Generalize, right now this function is used for testing.
GL.ClearColor(OpenTK.Color.Aqua);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
//currentProgram.Use();
//foreach vao
//something to segregate shaders and buffers
context.ProgramList["default"].Use();
OpenTK.Matrix4 model, view, projection;
model = OpenTK.Matrix4.Identity;//OpenTK.Matrix4.CreateTranslation(15.0f, 0.0f, 0.0f);
view = OpenTK.Matrix4.Identity;
projection = OpenTK.Matrix4.CreatePerspectiveFieldOfView(1.7f, 1.67f, 0.1f, 100.0f);
context.ProgramList["default"].SetAttribute("model", model);
context.ProgramList["default"].SetAttribute("view", view);
context.ProgramList["default"].SetAttribute("projection", projection);
currentVAO.Bind();
GL.DrawArrays(PrimitiveType.Triangles, 0, 3);
currentVAO.Unbind();
}
private void CreateBuffers()
{
_dataSpecification = new BufferDataSpecification
{
Count = 2,
Name = "in_position",
Offset = 0,
ShouldBeNormalised = false,
Stride = 0,
Type = VertexAttribPointerType.Float
};
_vertexArray = new VertexArray {
DrawPrimitiveType = PrimitiveType.Triangles
};
_vertexArray.Bind();
var size = 3 * 2 * sizeof(float);
_vertexBuffer = new VertexBuffer
{
BufferUsage = BufferUsageHint.StreamDraw,
DrawableIndices = 3,
MaxSize = size
};
_vertexBuffer.Bind();
_vertexBuffer.Initialise();
_vertexBuffer.DataSpecifications.Add(_dataSpecification);
_vertexArray.Load(_shaderProgram, _vertexBuffer);
_vertexArray.UnBind();
}
protected override void OnLoad(EventArgs e)
{
prog = new ShaderProgram(Shader.FromFile(vertPath), Shader.FromFile(fragPath));
textureWall = new Texture(System.Drawing.Image.FromFile("Data/wall.jpg"), 0, "wall");
textureContainer = new Texture(System.Drawing.Image.FromFile("Data/container2.png"), 1, "container");
vbo = new VertexBuffer <float>();
vbo.Bind();
vbo.BufferData(vertices);
vao = new VertexArray();
vao.Bind();
ibo = new IndexBuffer();
ibo.Bind();
ibo.BufferData(indices);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 5 * 4, 0);
GL.EnableVertexAttribArray(0);
GL.VertexAttribPointer(1, 2, VertexAttribPointerType.Float, false, 5 * 4, 3 * 4);
GL.EnableVertexAttribArray(1);
vao.Unbind();
ibo.Unbind();
vbo.Unbind();
prog.Use();
GL.PolygonMode(MaterialFace.FrontAndBack, PolygonMode.Fill);
}
public void CreateBuffers()
{
if (!BufferInitialized)
{
Vao = new VertexArray();
IndexBuffer = new Buffer <int>();
VertexBuffer = new Buffer <T>();
BufferInitialized = true;
Vao.Bind();
Vao.BindElementBuffer(IndexBuffer);
if (TempIndices.Count > 0)
{
IndexBuffer.Init(BufferTarget.ElementArrayBuffer, TempIndices.ToArray());
}
if (TempVertices.Count > 0)
{
VertexBuffer.Init(BufferTarget.ArrayBuffer, TempVertices.ToArray());
}
TempIndices.Clear();
TempVertices.Clear();
}
}
public static void RenderElements()
{
UIShader.Use();
UIShader.Projection.Set(ProjectionMatrix);
VAO.Bind();
VBO.Init(OpenTK.Graphics.OpenGL.BufferTarget.ArrayBuffer, VertexList.ToArray());
foreach (var spriteGroup in SpritesToRender.GroupBy(x => x.Texture))
{
spriteGroup.Key.Bind(OpenTK.Graphics.OpenGL.TextureUnit.Texture1);
UIShader.Texture.BindTexture(OpenTK.Graphics.OpenGL.TextureUnit.Texture1, spriteGroup.Key);
foreach (var sprite in spriteGroup)
{
UIShader.Opacity.Set(sprite.Opacity);
VAO.DrawArrays(OpenTK.Graphics.OpenGL.PrimitiveType.Quads, sprite.Offset, sprite.ElemCount);
}
}
if (Freetype6Loaded)
{
TextRenderer.RefreshBuffers();
TextRenderer.Draw();
TextRenderer.DisableShader();
}
}
private void OnLoad(object sender, EventArgs e)
{
// initialize shader (load sources, create/compile/link shader program, error checking)
// when using the factory method the shader sources are retrieved from the ShaderSourceAttributes
_program = ProgramFactory.Create<ExampleProgram>();
// this program will be used all the time so just activate it once and for all
_program.Use();
// create vertices for a triangle
var vertices = new[] { new Vector3(-1,-1,0), new Vector3(1,-1,0), new Vector3(0,1,0) };
// create buffer object and upload vertex data
_vbo = new Buffer<Vector3>();
_vbo.Init(BufferTarget.ArrayBuffer, vertices);
// create and bind a vertex array
_vao = new VertexArray();
_vao.Bind();
// set up binding of the shader variable to the buffer object
_vao.BindAttribute(_program.InPosition, _vbo);
// set camera position
Camera.DefaultState.Position = new Vector3(0,0,3);
Camera.ResetToDefault();
// set a nice clear color
GL.ClearColor(Color.MidnightBlue);
}
private void GenerateMesh(int width, int height)
{
if (_initialized)
{
Dispose();
}
_sampler = new Sampler();
_sampler.SetWrapMode(TextureWrapMode.Clamp);
_program = ProgramFactory.Create <SpriteShaderProgram>();
var w = width / 2;
var h = height / 2;
var vertices = new[] {
new Vertex(-w, h, 0, 0, 0),
new Vertex(w, h, 0, 1, 0),
new Vertex(-w, -h, 0, 0, 1),
new Vertex(w, -h, 0, 1, 1)
};
_vbo = new Buffer <Vertex>();
_vbo.Init(BufferTarget.ArrayBuffer, vertices);
_vao = new VertexArray();
_vao.Bind();
_vao.BindAttribute(_program.InPosition, _vbo);
_vao.BindAttribute(_program.InTexCoord, _vbo, 12);
_initialized = true;
}
public override void Draw(float time)
{
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
Lamp.Shader.Use();
_diffuseMap.Bind(0);
Lamp.Shader.SetInt("material.diffuse", 0);
_specularMap.Bind(1);
Lamp.Shader.SetInt("material.specular", 1);
Lamp.Shader.SetMatrix4("model", Matrix4.Identity);
Lamp.Shader.SetMatrix4("view", Camera.View);
Lamp.Shader.SetMatrix4("projection", Camera.Projection);
Lamp.Shader.SetVector3("light.position", Lamp.Position);
Lamp.Shader.SetVector3("light.ambient", new Vector3(0.2f));
Lamp.Shader.SetVector3("light.diffuse", new Vector3(.5f));
Lamp.Shader.SetVector3("light.specular", new Vector3(1.0f));
Lamp.Shader.SetVector3("viewPos", Camera.Position);
Lamp.Bind();
GL.DrawArrays(PrimitiveType.Triangles, 0, 36);
_modelShader.Use();
var lampMatrix = Matrix4.Identity;
lampMatrix *= Matrix4.CreateScale(0.2f);
lampMatrix *= Matrix4.CreateTranslation(Lamp.Position);
_modelShader.SetMatrix4("model", lampMatrix);
_modelShader.SetMatrix4("view", Camera.View);
_modelShader.SetMatrix4("projection", Camera.Projection);
_modelVao.Bind();
GL.DrawArrays(PrimitiveType.Triangles, 0, 36);
base.Draw(time);
}
public void Render(Matrix4 viewMatrix, Matrix4 viewProjectionMatrix)
{
SetDefaultMaterialParameter(ref Material, this.GameObject.LocalToWorldMatrix, viewMatrix, viewProjectionMatrix, GameObject.NormalMatrix);
vertexBuffer.Bind();
vertexBuffer.BufferData();
vertexArray.Bind();
indexBuffer.Bind();
indexBuffer.BufferData();
GL.DrawElements(BeginMode.Triangles, indexBuffer.Count, DrawElementsType.UnsignedShort, 0);
foreach (var renderer in subMeshRenderers)
{
renderer.Render(viewMatrix, viewProjectionMatrix);
}
// reset state for potential further draw calls (optional, but good practice)
vertexArray.Reset();
vertexBuffer.Reset();
indexBuffer.Reset();
Material.CleanUp();
}
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 OnLoad()
{
// initialize shader (load sources, create/compile/link shader program, error checking)
// when using the factory method the shader sources are retrieved from the ShaderSourceAttributes
_program = ProgramFactory.Create <GravityProgram>();
// this program will be used all the time so just activate it once and for all
_program.Use();
// create and bind a vertex array
_vao = new VertexArray();
_vao.Bind();
// create and bind transform feedback object
_feedback = new TransformFeedback();
_feedback.Bind();
// Writing to a buffer while reading from it is not allowed
// so we need two buffer objects here, which can be achieved by using the BufferPod<T> type.
// It contains two buffers, Ping and Pong, to simplify this process.
_buffers = new BufferPod <Particle>();
InitializeParticles(_particleCount);
// enable point sprite rendering
GL.Enable(EnableCap.PointSprite);
// enable modification of the point sprite size from the program (vertex shader in this case)
GL.Enable(EnableCap.ProgramPointSize);
// enable depth testing
GL.Enable(EnableCap.DepthTest);
// set a nice clear color
GL.ClearColor(Color.Black);
// set a nice camera angle
Camera.DefaultState.Position = new Vector3(0, 2, -8);
Camera.ResetToDefault();
}
protected override void OnRenderFrame(FrameEventArgs e)
{
t += (float)e.Time;
GL.ClearColor(0.1f, 0.1f, 0.1f, 1.0f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
prog.Use();
textureWall.ActivateTextureUnit();
textureWall.Bind();
GL.Uniform1(prog.GetUniformLoc("ourTexture1"), textureWall.TextureUnitAsInt);
textureContainer.ActivateTextureUnit();
textureContainer.Bind();
GL.Uniform1(prog.GetUniformLoc("ourTexture2"), textureContainer.TextureUnitAsInt);
vao.Bind();
GL.DrawElements(BeginMode.Triangles, 6, DrawElementsType.UnsignedInt, 0);
vao.Unbind();
this.SwapBuffers();
}
/// <summary>
/// Draws all the entities
/// </summary>
/// <param name="cameraMatrix"></param>
private void DrawEntities(Matrix4f cameraMatrix)
{
uint currentIndicieCount = 0;
foreach (IRenderable comp in renderComponents)
{
uint quadsCount = (uint)(comp.Vertices.Length / 4);
if (!comp.Enabled || !comp.Entity.Enabled)
{
currentIndicieCount += quadsCount * 6 * sizeof(int);
continue;
}
// Set Model view perspective
Matrix4f mvp = cameraMatrix * comp.Entity.Transform.GetMatrix();
testShader.SetUniformM4("MVP", mvp);
testShader.Bind();
VertexArray.Bind();
IndexBuffer.Bind();
for (int i = 0; i < quadsCount; i++)
{
Gl.DrawElements(PrimitiveType.Triangles, 6, DrawElementsType.UnsignedInt, (IntPtr)(currentIndicieCount + (i * 6 * sizeof(int))));
}
IndexBuffer.Unbind();
VertexArray.Unbind();
testShader.Unbind();
currentIndicieCount += quadsCount * 6 * sizeof(int);
}
}
private void InitialiseRendering()
{
_dataSpecification = new BufferDataSpecification
{
Count = 2,
Name = "in_position",
Offset = 0,
ShouldBeNormalised = false,
Stride = 0,
Type = VertexAttribPointerType.Float,
SizeInBytes = sizeof(float)
};
_vertexArray = new VertexArray {
DrawPrimitiveType = PrimitiveType.Triangles
};
_vertexArray.Bind();
_vertexBuffer = new VertexBuffer
{
BufferUsage = BufferUsageHint.StreamDraw,
DrawableIndices = _sides.Count(b => b) * 6 * 3,
MaxDrawableIndices = _sides.Count(b => b) * 6 * 3
};
_vertexBuffer.AddSpec(_dataSpecification);
_vertexBuffer.CalculateMaxSize();
_vertexBuffer.Bind();
_vertexBuffer.Initialise();
_vertexArray.Load(_shaderProgram, _vertexBuffer);
_vertexArray.UnBind();
}
public override void Setup()
{
GL.Enable(EnableCap.DepthTest);
GL.ClearColor(0.2f, 0.3f, 0.3f, 1.0f);
var vertexAttributes = new VertexAttribute[] {
new VertexAttribute("aPosition", 3, VertexAttribPointerType.Float, ColoredTexturedVertex.Size, 0)
};
var vbo = VertexBuffer.CreateVertexBuffer();
vbo.LoadData(CubeVertices());
_modelVao = VertexArray.CreateVertexArray();
_modelVao.Bind();
_modelShader = ShaderProgram.CreateShaderProgram("./Assets/Shaders/vertex.vert", "./Assets/Shaders/fragment.frag", vertexAttributes);
_modelShader.Use();
_modelShader.SetVertexAttributes();
var lamp = Light.CreateLight();
lamp.Bind();
var lampShader = ShaderProgram.CreateShaderProgram("./Assets/Shaders/vertex.vert", "./Assets/Shaders/lighting.frag", vertexAttributes);
lampShader.Use();
lampShader.SetVertexAttributes();
lamp.BindBuffer(OpenTK.Graphics.OpenGL4.BufferTarget.ArrayBuffer, vbo.Id);
lamp.Position = new Vector3(1.2f, 1.0f, 2.0f);
lamp.Shader = lampShader;
lamp.VertexBuffer = vbo;
Lamp = lamp;
}
public void Draw(VertexArray VAO, int first, int count)
{
if (!VAO.IsBinded)
{
VAO.Bind();
}
OpenGL.DrawArrays(PrimitiveType.Triangles, first, count);
}
public void Draw(VertexArray va, IndexBuffer ib, Shader shader)
{
va.Bind();
ib.Bind();
shader.Bind();
GL.DrawElements(PrimitiveType.Triangles, ib.GetCount(), DrawElementsType.UnsignedInt, IntPtr.Zero);
}
public Mesh(float[] b)
{
Count = b.Length;
vbo = b;
vao.Bind(vbo, OpenTK.Graphics.OpenGL4.BufferTarget.ArrayBuffer);
vao.AttributePointer(0, 3, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 6, 0);
vao.AttributePointer(1, 3, OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float, false, sizeof(float) * 6, sizeof(float) * 3);
}
public static void InitializeBuffers()
{
VAO = new VertexArray();
VBO = new Buffer <VertVT>();
VAO.Bind();
VAO.BindAttribute(UIShader.Position, VBO);
VAO.BindAttribute(UIShader.TexCoord, VBO, 12);
}
public void DrawElements(VertexArray VAO, int count, int offset = 0)
{
if (!VAO.IsBinded)
{
VAO.Bind();
}
OpenGL.DrawElements(PrimitiveType.Triangles, count, DrawElementsType.UnsignedInt, offset);
}
public DeferredRenderer()
{
_directionalProgram = ProgramFactory.Create <DirectionalLightProgram>();
_pointProgram = ProgramFactory.Create <PointLightProgram>();
_quad = new Quad();
_quad.UpdateBuffers();
_vaoFullScreenQuad = new VertexArray();
_vaoFullScreenQuad.Bind();
_vaoFullScreenQuad.BindAttribute(_directionalProgram.Position, _quad.VertexBuffer);
}
public void Draw()
{
_shader.Enable();
_vertexArray.Bind();
GL.DrawArrays(PrimitiveType.Quads, 0, Constants.VERTICES_PER_OBJECT * _renderablesToDraw.Count);
_vertexArray.Unbind();
_shader.Disable();
}
public static void Submit(ShaderProgram shader, VertexArray vertexArray, Matrix4 transform)
{
shader.Bind();
shader.UploadUniformMatrix("u_ViewProjection", _viewProjectionMatrix);
shader.UploadUniformMatrix("u_Transform", transform);
shader.UploadUniformFloat4("u_color", new Vector4(1.0f));
vertexArray.Bind();
RenderCommand.DrawIndexed(vertexArray);
}
private void OnLoad(object sender, EventArgs e)
{
// initialize and bind framebuffer
_framebuffer = new Framebuffer();
_framebuffer.Bind(FramebufferTarget.Framebuffer);
// initialize a renderbuffer and bind it to the depth attachment
// to support depth testing while rendering to the texture
_depthBuffer = new Renderbuffer();
_depthBuffer.Init(RenderbufferStorage.DepthComponent, FramebufferWidth, FramebufferHeight);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, _depthBuffer);
// initialize texture and bind it to the color attachment
_texture = new Texture2D(SizedInternalFormat.Rgba8, FramebufferWidth, FramebufferHeight, 1);
_framebuffer.Attach(FramebufferTarget.Framebuffer, FramebufferAttachment.ColorAttachment0, _texture);
Framebuffer.Unbind(FramebufferTarget.Framebuffer);
// initialize demonstration geometry
_cube = new ColorCube();
_cube.UpdateBuffers();
_quad = new TexturedQuad();
_quad.UpdateBuffers();
// initialize shaders
_colorProgram = ProgramFactory.Create<SimpleColorProgram>();
_textureProgram = ProgramFactory.Create<SimpleTextureProgram>();
// set up vertex attributes for the cube
_cubeVao = new VertexArray();
_cubeVao.Bind();
_cubeVao.BindAttribute(_colorProgram.InPosition, _cube.VertexBuffer);
_cubeVao.BindAttribute(_colorProgram.InColor, _cube.ColorBuffer);
_cubeVao.BindElementBuffer(_cube.IndexBuffer);
// set up vertex attributes for the quad
_quadVao = new VertexArray();
_quadVao.Bind();
_quadVao.BindAttribute(_textureProgram.InPosition, _quad.VertexBuffer);
_quadVao.BindAttribute(_textureProgram.InTexCoord, _quad.TexCoordBuffer);
// set camera position
Camera.DefaultState.Position = new Vector3(0,0,3);
Camera.ResetToDefault();
// enable depth testing
GL.Enable(EnableCap.DepthTest);
}
protected void OnLoad(object sender, EventArgs e)
{
// load textures into array
for (var i = 0; i < _stateTextures.Length; i++)
{
using (var bitmap = new Bitmap(Path.Combine("Data/Textures/", _stateTextures[i])))
{
bitmap.RotateFlip(RotateFlipType.RotateNoneFlipY);
if (_textureArray == null) BitmapTexture.CreateCompatible(bitmap, out _textureArray, _stateTextures.Length, 1);
_textureArray.LoadBitmap(bitmap, i);
}
}
// initialize buffer
var field = new Minefield[FieldWidth*FieldHeight];
for (var i = 0; i < field.Length; i++)
{
field[i] = new Minefield(i%FieldWidth, i/FieldHeight, i%_stateTextures.Length);
}
_buffer = new Buffer<Minefield>();
_buffer.Init(BufferTarget.ArrayBuffer, field);
// load program
_gridProgram = ProgramFactory.Create<TextureGridProgram>();
_gridProgram.Use();
// bind the texture and set uniform
_gridProgram.TextureData.BindTexture(TextureUnit.Texture0, _textureArray);
// set up vertex array and attributes
_vao = new VertexArray();
_vao.Bind();
_vao.BindAttribute(_gridProgram.InPosition, _buffer);
_vao.BindAttribute(_gridProgram.InTexture, _buffer, 8);
// set nice clear color
GL.ClearColor(Color.MidnightBlue);
// initialize camera position
Camera.DefaultState.Position = new Vector3(0, 5, 15);
Camera.ResetToDefault();
}
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);
}
protected void OnLoad(object sender, EventArgs eventArgs)
{
VSync = VSyncMode.Off;
// Check for necessary capabilities:
var extensions = GL.GetString(StringName.Extensions);
if (!GL.GetString(StringName.Extensions).Contains("GL_ARB_shading_language"))
{
throw new NotSupportedException(String.Format("This example requires OpenGL 2.0. Found {0}. Aborting.",
GL.GetString(StringName.Version).Substring(0, 3)));
}
if (!extensions.Contains("GL_ARB_texture_compression") ||
!extensions.Contains("GL_EXT_texture_compression_s3tc"))
{
throw new NotSupportedException("This example requires support for texture compression. Aborting.");
}
var temp = new int[1];
GL.GetInteger(GetPName.MaxTextureImageUnits, out temp[0]);
Trace.WriteLine(temp[0] + " TMU's for Fragment Shaders found. (2 required)");
GL.GetInteger(GetPName.MaxVaryingFloats, out temp[0]);
Trace.WriteLine(temp[0] + " varying floats between VS and FS allowed. (6 required)");
GL.GetInteger(GetPName.MaxVertexUniformComponents, out temp[0]);
Trace.WriteLine(temp[0] + " uniform components allowed in Vertex Shader. (6 required)");
GL.GetInteger(GetPName.MaxFragmentUniformComponents, out temp[0]);
Trace.WriteLine(temp[0] + " uniform components allowed in Fragment Shader. (11 required)");
Trace.WriteLine("");
// load textures
TextureLoaderParameters.MagnificationFilter = TextureMagFilter.Linear;
TextureLoaderParameters.MinificationFilter = TextureMinFilter.LinearMipmapLinear;
TextureLoaderParameters.WrapModeS = TextureWrapMode.ClampToBorder;
TextureLoaderParameters.WrapModeT = TextureWrapMode.ClampToBorder;
TextureLoaderParameters.EnvMode = TextureEnvMode.Modulate;
uint handle;
TextureTarget target;
ImageDDS.LoadFromDisk(TextureDiffuseHeightFilename, out handle, out target);
_textureDiffuseHeight = TextureFactory.AquireTexture2D((int) handle);
Trace.WriteLine("Loaded " + TextureDiffuseHeightFilename + " with handle " + handle + " as " + target);
ImageDDS.LoadFromDisk(TextureNormalGlossFilename, out handle, out target);
_textureNormalGloss = TextureFactory.AquireTexture2D((int) handle);
Trace.WriteLine("Loaded " + TextureNormalGlossFilename + " with handle " + handle + " as " + target);
Trace.WriteLine("End of Texture Loading. GL Error: " + GL.GetError());
Trace.WriteLine("");
// initialize buffer
var normal = Vector3.UnitZ;
var tangent = Vector3.UnitX;
var vertices = new[]
{
new Vertex
{
Position = new Vector3(-1,-1,0),
TexCoord = new Vector2(0,0),
Normal = normal,
Tangent = tangent
},
new Vertex
{
Position = new Vector3(1,-1,0),
TexCoord = new Vector2(1,0),
Normal = normal,
Tangent = tangent
},
new Vertex
{
Position = new Vector3(-1,1,0),
TexCoord = new Vector2(0,1),
Normal = normal,
Tangent = tangent
},
new Vertex
{
Position = new Vector3(1,1,0),
TexCoord = new Vector2(1,1),
Normal = normal,
Tangent = tangent
}
};
_buffer = new Buffer<Vertex>();
_buffer.Init(BufferTarget.ArrayBuffer, vertices);
// load shader
_program = ProgramFactory.Create<ParallaxProgram>();
_program.Use();
// set up vertex array
_vao = new VertexArray();
_vao.Bind();
// bind vertex attributes
// the buffer layout is defined by the Vertex struct:
// data X Y Z NX NY NZ TX TY TZ U V *next vertex*
// offset 0 4 8 12 16 20 24 28 32 36 40 44
// having to work with offsets could be prevented by using seperate buffer objects for each attribute,
// but that might reduce performance and can get annoying as well.
// performance increase could also be achieved by improving coherent read access
// by padding the struct so that each attribute begins at a multiple of 16 bytes, i.e. 4-floats
// because the GPU can then read all 4 floats at once. I did not do that here to keep it simple.
_vao.BindAttribute(_program.InPosition, _buffer);
_vao.BindAttribute(_program.InNormal, _buffer, 12);
_vao.BindAttribute(_program.InTangent, _buffer, 24);
_vao.BindAttribute(_program.InTexCoord, _buffer, 36);
// set camera position
Camera.DefaultState.Position = new Vector3(0,0,3);
Camera.ResetToDefault();
// set state
GL.ClearColor(0.2f, 0f, 0.4f, 0f);
GL.PointSize(10f);
GL.Disable(EnableCap.Dither);
GL.FrontFace(FrontFaceDirection.Ccw);
GL.PolygonMode(MaterialFace.Front, PolygonMode.Fill);
GL.PolygonMode(MaterialFace.Back, PolygonMode.Line);
}
private void OnLoad(object sender, EventArgs e)
{
// initialize shader (load sources, create/compile/link shader program, error checking)
// when using the factory method the shader sources are retrieved from the ShaderSourceAttributes
_program = ProgramFactory.Create<GravityProgram>();
// this program will be used all the time so just activate it once and for all
_program.Use();
// create and bind a vertex array
_vao = new VertexArray();
_vao.Bind();
// create and bind transform feedback object
_feedback = new TransformFeedback();
_feedback.Bind();
// Writing to a buffer while reading from it is not allowed
// so we need two buffer objects here, which can be achieved by using the BufferPod<T> type.
// It contains two buffers, Ping and Pong, to simplify this process.
_buffers = new BufferPod<Particle>();
InitializeParticles(_particleCount);
// enable point sprite rendering
GL.Enable(EnableCap.PointSprite);
// enable modification of the point sprite size from the program (vertex shader in this case)
GL.Enable(EnableCap.ProgramPointSize);
// enable depth testing
GL.Enable(EnableCap.DepthTest);
// set a nice clear color
GL.ClearColor(Color.Black);
// set a nice camera angle
Camera.DefaultState.Position = new Vector3(0,2,-8);
Camera.ResetToDefault();
}
