public void Render(GLCamera cam, bool renderBG)
{
cam.LoadProjection();
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.PolygonMode(MaterialFace.FrontAndBack, PolygonMode.Fill);
GL.Color4(Color.White);
GL.Enable(EnableCap.Texture2D);
float
halfW = (float)Width / 2.0f,
halfH = (float)Height / 2.0f;
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
GL.MatrixMode(MatrixMode.Texture);
GL.LoadIdentity();
if (renderBG)
{
GL.PushAttrib(AttribMask.TextureBit);
GLTexture bgTex = TKContext.FindOrCreate <GLTexture>("TexBG", GLTexturePanel.CreateBG);
bgTex.Bind();
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
float
s = (float)Width / (float)bgTex.Width,
t = (float)Height / (float)bgTex.Height;
GL.Begin(BeginMode.Quads);
GL.TexCoord2(0.0f, 0.0f);
GL.Vertex2(-halfW, -halfH);
GL.TexCoord2(s, 0.0f);
GL.Vertex2(halfW, -halfH);
GL.TexCoord2(s, t);
GL.Vertex2(halfW, halfH);
GL.TexCoord2(0.0f, t);
GL.Vertex2(-halfW, halfH);
GL.End();
GL.PopAttrib();
}
if (Tex0 == null)
{
return;
}
Tex0.Prepare(_targetMatRef, -1);
GLTexture texture = GLTex;
if (texture == null || texture._texId <= 0)
{
return;
}
MDL0TextureNode.ApplyGLTextureParameters(_targetMatRef);
//These are used to match up the UV overlay to the texture underneath
Vector2 topLeft = new Vector2();
Vector2 bottomRight = new Vector2();
float texWidth = texture.Width;
float texHeight = texture.Height;
float tAspect = (float)texWidth / texHeight;
float wAspect = (float)Width / Height;
float[] texCoord = new float[8];
//These are used to compensate for padding added on an axis
float xCorrect = 1.0f, yCorrect = 1.0f;
if (tAspect > wAspect)
{
//Texture is wider, use horizontal fit
//X touches the edges of the window, Y has top and bottom padding
//X
texCoord[0] = texCoord[6] = 0.0f;
texCoord[2] = texCoord[4] = 1.0f;
//Y
texCoord[1] = texCoord[3] = (yCorrect = tAspect / wAspect) / 2.0f + 0.5f;
texCoord[5] = texCoord[7] = 1.0f - texCoord[1];
bottomRight = new Vector2(halfW, (((float)Height - ((float)Width / texWidth * texHeight)) / (float)Height / 2.0f - 0.5f) * (float)Height);
topLeft = new Vector2(-halfW, -bottomRight._y);
}
else
{
//Window is wider, use vertical fit
//Y touches the edges of the window, X has left and right padding
//Y
texCoord[1] = texCoord[3] = 1.0f;
texCoord[5] = texCoord[7] = 0.0f;
//X
texCoord[2] = texCoord[4] = (xCorrect = wAspect / tAspect) / 2.0f + 0.5f;
texCoord[0] = texCoord[6] = 1.0f - texCoord[2];
bottomRight = new Vector2(1.0f - (((float)Width - ((float)Height / texHeight * texWidth)) / Width / 2.0f - 0.5f) * (float)Width, -halfH);
topLeft = new Vector2(-bottomRight._x, halfH);
}
//Apply the texcoord bind transform first
TextureFrameState state = _targetMatRef._bindState;
GL.MultMatrix((float *)&state._transform);
//Translate the texture coordinates to match where the user dragged the camera
//Divide by width and height to convert window units (0 to w, 0 to h) to texcoord units (0 to 1)
//Then multiply by the correction value if the window is bigger than the texture on an axis
Vector3 point = cam.GetPoint();
GL.Translate(point._x / Width * xCorrect, -point._y / Height * yCorrect, 0);
//Now to scale the texture after translating.
//The scale origin is the top left of the texture on the window (not of the window itself),
//so we need to translate the center of the texture to that origin,
//scale it up or down, then translate it back to where it was.
OpenTK.Vector3 trans = new OpenTK.Vector3(-topLeft._x / Width * xCorrect, topLeft._y / Height * yCorrect, 0.0f);
GL.Translate(trans);
GL.Scale((OpenTK.Vector3)cam._scale);
GL.Translate(-trans);
//Bind the material ref's texture
GL.BindTexture(TextureTarget.Texture2D, texture._texId);
//Draw a quad across the screen and render the texture with the calculated texcoords
GL.Begin(BeginMode.Quads);
GL.TexCoord2(texCoord[0], texCoord[1]);
GL.Vertex2(-halfW, -halfH);
GL.TexCoord2(texCoord[2], texCoord[3]);
GL.Vertex2(halfW, -halfH);
GL.TexCoord2(texCoord[4], texCoord[5]);
GL.Vertex2(halfW, halfH);
GL.TexCoord2(texCoord[6], texCoord[7]);
GL.Vertex2(-halfW, halfH);
GL.End();
GL.Disable(EnableCap.Texture2D);
//Now load the camera transform and draw the UV overlay over the texture
cam.LoadModelView();
//Color the lines limegreen, a bright color that probably won't be in a texture
GL.Color4(Color.LimeGreen);
Vector2 mdlScale = new Vector2(bottomRight._x - topLeft._x, bottomRight._y - topLeft._y);
GL.Translate(topLeft._x, topLeft._y, 0.0f);
GL.Scale(mdlScale._x, mdlScale._y, 1.0f);
GL.PolygonMode(MaterialFace.FrontAndBack, PolygonMode.Line);
GL.LineWidth(1);
//Render texture coordinates as vertex points
foreach (RenderInfo info in _renderInfo)
{
info.PrepareStream();
}
}