/// <summary>
/// Renders the object in a viewport
/// </summary>
private void RenderObject(DisplayObject obj, Rhino.DocObjects.ViewportInfo viewport, bool isInstance)
{
// If the object is invisible, return.
if (!obj.IsVisible)
return;
// If the layer that the object is on is turned off, return.
if (!Model.LayerIsVisibleAtIndex (obj.LayerIndex))
return;
DisplayMesh displayMesh = isInstance ? ((DisplayInstanceMesh)obj).Mesh : (DisplayMesh)obj;
if (displayMesh.WillFitOnGPU == false)
return;
uint vertex_buffer = 0;
uint index_buffer = 0;
if (displayMesh != null) {
// Material setup, if necessary...
displayMesh.Material.AmbientColor = new [] { 0.0f, 0.0f, 0.0f, 1.0f }; //We want to ignore the ambient color
if (CurrentMaterial.RuntimeId != displayMesh.Material.RuntimeId)
ActiveShader.SetupMaterial (displayMesh.Material);
CurrentMaterial = displayMesh.Material;
if (displayMesh.IndexBufferHandle == Globals.UNSET_HANDLE) {
// Generate the Index VBO
GL.GenBuffers (1, out index_buffer);
GL.BindBuffer (BufferTarget.ElementArrayBuffer, index_buffer);
displayMesh.IndexBufferHandle = index_buffer;
}
if (displayMesh.VertexBufferHandle == Globals.UNSET_HANDLE) {
// Generate the VertexBuffer
GL.GenBuffers (1, out vertex_buffer);
GL.BindBuffer (BufferTarget.ArrayBuffer, vertex_buffer);
displayMesh.VertexBufferHandle = vertex_buffer;
displayMesh.LoadDataForVBOs (displayMesh.Mesh);
// If CheckGLError turns up an error (likely an OutOfMemory warning because the mesh won't fit on the GPU)
// we need to delete the buffers associated with that displayMesh and mark it as too big.
bool causesGLError = CheckGLError ("GL.BufferData");
if (causesGLError) {
GL.DeleteBuffers (1, ref vertex_buffer);
GL.DeleteBuffers (1, ref index_buffer);
displayMesh.WillFitOnGPU = false;
GC.Collect ();
} else {
displayMesh.WillFitOnGPU = true;
}
// If we have drawn all the partitions associated with the underlying openNURBS mesh in the ModelFile, we can delete it...
if (displayMesh.Mesh.PartitionCount == displayMesh.PartitionIndex + 1)
Model.ModelFile.Objects.Delete (displayMesh.FileObjectId);
displayMesh.Mesh = null;
}
if (displayMesh.WillFitOnGPU == false)
return;
// Vertices
// ORDER MATTERS...if you don't do things in this order, you will get very frusterated.
// First, enable the VertexAttribArray for positions
int rglVertex = ActiveShader.RglVertexIndex;
GL.EnableVertexAttribArray (rglVertex);
// Second, Bind the ArrayBuffer
GL.BindBuffer (BufferTarget.ArrayBuffer, displayMesh.VertexBufferHandle);
// Third, tell GL where to look for the data...
GL.VertexAttribPointer (rglVertex, 3, VertexAttribPointerType.Float, false, displayMesh.Stride, IntPtr.Zero);
CheckGLError ("GL.VertexAttribPointer");
// Normals
if (displayMesh.HasVertexNormals) {
int rglNormal = ActiveShader.RglNormalIndex;
GL.EnableVertexAttribArray (rglNormal);
GL.VertexAttribPointer (rglNormal, 3, VertexAttribPointerType.Float, false, displayMesh.Stride, (IntPtr)(Marshal.SizeOf (typeof(Rhino.Geometry.Point3f))));
CheckGLError ("GL.VertexAttribPointer");
}
// Colors
if (displayMesh.HasVertexColors) {
int rglColor = ActiveShader.RglColorIndex;
GL.EnableVertexAttribArray (rglColor);
GL.VertexAttribPointer (rglColor, 4, VertexAttribPointerType.Float, false, displayMesh.Stride, (IntPtr)(Marshal.SizeOf (typeof(Rhino.Display.Color4f))));
CheckGLError ("GL.VertexAttribPointer");
}
if (isInstance) {
if (!FastDrawing) {
// Check for inversions on transforms, but only if we are drawing the final "high-quality" frame
// (because our PerPixel shader does not flip normals based on modelView matrices).
if ((obj as DisplayInstanceMesh).XForm.Determinant < -Globals.ON_ZERO_TOLERANCE) {
// an inversion (happens in mirrored instances, etc.)
// this means the transformation will turn the mesh
// inside out, so we have to reverse our front face
// convention.
GL.FrontFace (FrontFaceDirection.Cw);
} else {
GL.FrontFace (FrontFaceDirection.Ccw);
}
}
ActiveShader.SetModelViewMatrix ((obj as DisplayInstanceMesh).XForm);
}
// Bind Indices
GL.BindBuffer (BufferTarget.ElementArrayBuffer, displayMesh.IndexBufferHandle);
CheckGLError ("GL.BindBuffer");
// Draw...
#if __ANDROID__
GL.DrawElements (All.Triangles, displayMesh.IndexBufferLength, All.UnsignedShort, IntPtr.Zero);
#endif
#if __IOS__
GL.DrawElements (BeginMode.Triangles, displayMesh.IndexBufferLength, DrawElementsType.UnsignedShort, IntPtr.Zero);
#endif
// Disable any and all arrays and buffers we might have used...
GL.BindBuffer (BufferTarget.ArrayBuffer, displayMesh.VertexBufferHandle);
GL.DisableVertexAttribArray (ActiveShader.RglColorIndex);
GL.DisableVertexAttribArray (ActiveShader.RglNormalIndex);
GL.DisableVertexAttribArray (ActiveShader.RglVertexIndex);
GL.BindBuffer (BufferTarget.ElementArrayBuffer, displayMesh.IndexBufferHandle);
GL.BindBuffer (BufferTarget.ArrayBuffer, 0);
GL.BindBuffer (BufferTarget.ElementArrayBuffer, 0);
}
}