Trying to impose a triangle texture on OpenTK ES (Xamarin) with this code

using System; using OpenTK; using OpenTK.Graphics.ES11; using OpenTK.Platform.Android; using Android.Content; namespace TexturedTriangle { class GLView1 AndroidGameView { public GLView1(Context context) base(context) { } protected override void CreateFrameBuffer() { base.CreateFrameBuffer(); } Vector2[] TexCoords = { new Vector2(0, 0), new Vector2(1, 0), new Vector2(0, 1), }; Vector2[] Vertices = { new Vector2(0f, 0f), new Vector2(1f, 0f), new Vector2(0f, 1f), }; int[] Tex = new int[1]; int[] VBOs = new int[2]; protected override void OnLoad(EventArgs e) { base.OnLoad(e); GL.ClearColor(0, 0, 0, 1f); GL.Clear((int)All.ColorBufferBit); GL.MatrixMode(All.Projection); GL.LoadIdentity(); GL.MatrixMode(All.Modelview); GL.LoadIdentity(); GL.Enable(All.Texture2D); GL.GenBuffers(2, VBOs); GL.BindBuffer(All.ArrayBuffer, VBOs[0]); GL.BufferData(All.ArrayBuffer, new IntPtr(Vertices.Length Vector2.SizeInBytes), Vertices, All.StaticDraw); GL.BindBuffer(All.ArrayBuffer, VBOs[1]); GL.BufferData(All.ArrayBuffer, new IntPtr(TexCoords.Length Vector2.SizeInBytes), TexCoords, All.StaticDraw); int[] Data = new int[32 32]; for (int I = 0; I 32 32; I++) { if (I % 3 == 0) Data[I] = 255; if (I % 3 == 1) Data[I] = 65280; if (I % 3 == 2) Data[I] = 16711680; } GL.GenTextures(1, Tex); GL.BindTexture(All.Texture2D, Tex[0]); GL.TexParameter(All.Texture2D, All.TextureMinFilter, (int)All.Nearest); GL.TexParameter(All.Texture2D, All.TextureMagFilter, (int)All.Nearest); GL.TexImage2D(All.Texture2D, 0, 3, 32, 32, 0, All.Rgba, All.UnsignedByte, Data); GL.EnableClientState(All.VertexArray); GL.EnableClientState(All.TextureCoordArray); Run(); } protected override void OnRenderFrame(FrameEventArgs e) { base.OnRenderFrame(e); GL.BindBuffer(All.ArrayBuffer, VBOs[0]); GL.VertexPointer(2, All.Float, BlittableValueType.StrideOf(Vertices) IntPtr.Zero); GL.BindBuffer(All.ArrayBuffer, VBOs[1]); GL.TexCoordPointer(2, All.Float, BilittableValueType.StrideOf(TexCoords), IntPtr.Zero); GL.DrawArrays(All.Triangles, 0, 3); SwapBuffers(); } } }

But it turns out only white triangle

Textured triangle

In this case, the same code in the usual OpenTK

 using System; using OpenTK; using OpenTK.Graphics; using OpenTK.Graphics.OpenTK; namespace TexturedTriangle { class Program { static void Main() { GameWindow Window = new GameWindow(512, 512, GraphicsMode.Default, "Textured Triangle"); int[] Tex = new int[1]; int[] VBOs = new int[2]; Vector2[] TexCoords = { new Vector2(0, 0), new Vector2(1, 0), new Vector2(0, 1), }; Vector2[] Vertices = { new Vector2(0f, 0f), new Vector2(1f, 0f), new Vector2(0f, 1f), }; Window.Load += (sender, e) => { GL.ClearColor(0, 0, 0, 1f); GL.Clear(ClearBufferMask.ColorBufferBit); GL.MatrixMode(MatrixMode.Projection); GL.LoadIdentity(); GL.MatrixMode(MatrixMode.Modelview); GL.LoadIdentity(); GL.Enable(EnableCap.Texture2D); GL.GenBuffers(2, VBOs); GL.BindBuffer(BufferTarget.ArrayBuffer, VBOs[0]); GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(Vertices.Length * Vector2.SizeInBytes), Vertices, BufferUsageHint.StaticDraw); GL.BindBuffer(BufferTarget.ArrayBuffer, VBOs[1]); GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(TexCoords.Length * Vector2.SizeInBytes), TexCoords, BufferUsageHint.StaticDraw); int[] Data = new int[32 * 32]; for (int I = 0; I < 32 * 32; I++) { if (I % 3 == 0) Data[I] = 255; if (I % 3 == 1) Data[I] = 65280; if (I % 3 == 2) Data[I] = 16711680; } GL.GenTextures(1, Tex); GL.BindTexture(TextureTarget.Texture2D, Tex[0]); GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest); GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest); GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Three, 32, 32, 0, PixelFormat.Rgba, PixelType.UnsignedByte, Data); GL.EnableClientState(ArrayCap.VertexArray); GL.EnableClientState(ArrayCap.TextureCoordArray); }; Window.RenderFrame += (sender, e) => { GL.Clear(ClearBufferMask.ColorBufferBit); GL.BindBuffer(BufferTarget.ArrayBuffer, VBOs[0]); GL.VertexPointer(2, VertexPointerType.Float, BlittableValueType.StrideOf(Vertices), IntPtr.Zero); GL.BindBuffer(BufferTarget.ArrayBuffer, VBOs[1]); GL.TexCoordPointer(2, TexCoordPointerType.Float, BlittableValueType.StrideOf(TexCoords), IntPtr.Zero); GL.DrawArrays(PrimitiveType.Triangles, 0, 3); Window.SwapBuffers(); }; Window.Run(); } } }

Works, and gives it:

Textured triangle

In this case, after GL.TexImage2D ();

GL.GetError (); Throws InvalidValue

Documentation: www.khronos.org/opengles/sdk/docs/man/xhtml/glTexImage2D.xml

What could be the problem?

    1 answer 1

    Found an error, the InternalFormat and Format must match, otherwise InvalidValue just comes out.