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 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);
}
/// <summary>
/// Creates a new Texture2D instance compatible to the given bitmap.
/// </summary>
/// <param name="bitmap">Specifies the bitmap to which the new texture will be compatible.</param>
/// <param name="texture">Outputs the newly created texture.</param>
/// <param name="levels">Specifies the number of mipmap levels.</param>
public static void CreateCompatible(Bitmap bitmap, out Texture2D texture, int levels = 0)
{
texture = new Texture2D(BitmapFormat.Get(bitmap).InternalFormat, bitmap.Width, bitmap.Height, levels);
}