gistfile1.txt

public void Render(Matrix4 viewMatrix, Matrix4 projectionMatrix)
{
	if (!IsInitialized)
	{
		return;
	}

	GL.UseProgram(this.Plain2DShaderID);

	// Render the object
	// Send the vertices to the shader
	GL.EnableVertexAttribArray(0);
	GL.BindBuffer(BufferTarget.ArrayBuffer, this.VertexBufferID);
	GL.VertexAttribPointer(
		0,
		2,
		VertexAttribPointerType.Float,
		false,
		0,
		0);

	// Send the UV coordinates to the shader
	GL.EnableVertexAttribArray(1);
	GL.BindBuffer(BufferTarget.ArrayBuffer, this.UVBufferID);
	GL.VertexAttribPointer(
		1,
		2,
		VertexAttribPointerType.Float,
		false,
		0,
		0);

	// Set the texture ID as a uniform sampler in unit 0
	GL.ActiveTexture(TextureUnit.Texture0);
	GL.BindTexture(TextureTarget.Texture2D, this.GLTextureID);
	int textureVariableHandle = GL.GetUniformLocation(this.Plain2DShaderID, "imageTextureSampler");
	int textureUnit = 0;
	GL.Uniform1(textureVariableHandle, 1, ref textureUnit);

	// Set the model view matrix
	Matrix4 modelTranslation = Matrix4.CreateTranslation(new Vector3(0.0f, 0.0f, 0.0f));
	Matrix4 modelScale = Matrix4.Scale(new Vector3(1.0f, 1.0f, 1.0f));
	//Matrix4 modelViewProjection = modelScale * modelTranslation * viewMatrix * projectionMatrix;
	Matrix4 modelViewProjection = modelScale * modelTranslation * viewMatrix * projectionMatrix;

	// Send the model matrix to the shader
	int projectionShaderVariableHandle = GL.GetUniformLocation(this.Plain2DShaderID, "ModelViewProjection");
	GL.UniformMatrix4(projectionShaderVariableHandle, false, ref modelViewProjection);

	// Finally, draw the image
	GL.BindBuffer(BufferTarget.ElementArrayBuffer, this.VertexIndexBufferID);
	GL.DrawElements(BeginMode.Triangles, 6, DrawElementsType.UnsignedShort, 0);

	// Release the attribute arrays
	GL.DisableVertexAttribArray(0);
  GL.DisableVertexAttribArray(1);
}