See that the location definition and the first parameter of the GL.VertexAttrib4 match. Position.Y = (float)Math.Cos(_time) * 0.5f Position.X = (float)Math.Sin(_time) * 0.5f And we just set the gl_Position to whatever value is supplied by our game code.Īnd in our OnRenderFrame we add the following Here we add a new in attribute, position that is a vec4. Key here is that the first parameter of GL.VertexAttrib1 should match the location definition in our shader. This should result in the vertex blending in color over time. Gl_Position = vec4( 0.25, -0.25, 0.5, 1.0) įrag_color = vec4(sin(time) * 0.5 + 0.5, cos(time) * 0.5 + 0.5, 0.0, 0.0) Īnd in our OnRenderFrame we add the following to pass along our float time to the shader. out parameter of vertex shader matches the in parameter of fragment shader. So, lets modify our vertex shader to take a parameter, time in this case and calculate a color and forward it to the fragment shader. GL.DrawArrays(PrimitiveType.Points, 0, 1) GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit) Protected override void OnRenderFrame(FrameEventArgs e)
Added _time to hold total time elapsed as OpenTK seems to be giving the delta time only in the FrameEventArgs. This part will build upon the game window and shaders from the previous post.ĭefining in parameters to our Vertex Shaderįor starters a reminder of our OnRenderFrame method from the previous posts. I write these posts as a way to learn, if you want to have all the theory behind why things are done in a certain way I recommend reading OpenGL SuperBible, Seventh Edition :) OpenGL 4 with OpenTK in C# Part 15: Object picking by mouseĪs stated in the previous post, I am in no way an expert in OpenGL. OpenGL 4 with OpenTK in C# Part 14: Basic Text OpenGL 4 with OpenTK in C# Part 13: IcoSphere OpenGL 4 with OpenTK in C# Part 12: Basic Moveable Camera OpenGL 4 with OpenTK in C# Part 11: Mipmap OpenGL 4 with OpenTK in C# Part 10: Asteroid Invadersīasic bullet movement patterns in Asteroid Invaders
OpenGL 4 with OpenTK in C# Part 9: Texturing OpenGL 4 with OpenTK in C# Part 8: Drawing multiple objects OpenGL 4 with OpenTK in C# Part 7: Vectors and Matrices OpenGL 4 with OpenTK in C# Part 6: Rotations and Movement of objects OpenGL 4 with OpenTK in C# Part 5: Buffers and Triangle OpenGL 4 with OpenTK in C# Part 4: Refactoring and adding error handling OpenGL 4 with OpenTK in C# Part 3: Passing data to shaders OpenGL 4 with OpenTK in C# Part 2: Compiling shaders and linking them OpenGL 4 with OpenTK in C# Part 1: Initialize the GameWindow
#Opengl 4.4 demo series#
This is part 3 of my series on OpenGL4 with OpenTK.
#Opengl 4.4 demo code#
In this post we will look passing data from your application code to the shaders using OpenTK.
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