public void CreateMaterialRender(GLContext control, GenericPickableMesh mesh,
RenderObject renderObject, EventHandler thumbnailUpdated, int width = 50, int height = 50)
{
ShaderProgram shader = this.GetShader();
if (shader == null)
{
return;
}
Framebuffer frameBuffer = new Framebuffer(FramebufferTarget.Framebuffer, width, height);
frameBuffer.Bind();
//Create a simple mvp matrix to render the material data
Matrix4 modelMatrix = Matrix4.CreateTranslation(0, 0, -12);
Matrix4 viewMatrix = Matrix4.Identity;
Matrix4 mtxProj = Matrix4.CreatePerspectiveFieldOfView(MathHelper.DegreesToRadians(90), 1.0f, 1.0f, 1000f);
Matrix4 viewProj = mtxProj * viewMatrix;
GL.UseProgram(shader.program);
shader.SetMatrix4x4("mtxCam", ref viewProj);
shader.SetMatrix4x4("mtxMdl", ref modelMatrix);
shader.SetVector3("camPosition", control.Camera.TargetPosition);
shader.SetVector2("iResolution", new Vector2(control.Width, control.Height));
shader.SetInt("materialRenderDisplay", 1);
GL.ClearColor(0, 0, 0, 0);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.Viewport(0, 0, width, height);
//Render material data onto a textured sphere
Render(control, shader, mesh);
GL.Enable(EnableCap.Blend);
GL.BlendFuncSeparate(
BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha,
BlendingFactorSrc.One, BlendingFactorDest.OneMinusSrcAlpha);
//Draw the model to render onto
switch (renderObject)
{
case RenderObject.Sphere:
DrawSphere(control);
break;
case RenderObject.Plane:
DrawPlane(control);
break;
}
//Disable the uniform data
shader.SetInt("materialRenderDisplay", 0);
//Disable shader and textures
GL.UseProgram(0);
GL.BindTexture(TextureTarget.Texture2D, 0);
var thumbnail = frameBuffer.ReadImagePixels(true);
//Dispose frame buffer
frameBuffer.Dispoe();
frameBuffer.DisposeRenderBuffer();
this.Thumbnail = thumbnail;
thumbnailUpdated?.Invoke(this, EventArgs.Empty);
}
public virtual void Render(GLContext control, ShaderProgram shader, GenericPickableMesh mesh)
{
}
