void Render()
{
Gl.Clear(GlClearBufferMask.ColorBufferBit);
Gl.Begin(GlPrimitiveType.Quads);
Gl.ActiveTexture(GlTextureUnit.Texture0);
Gl.BindTexture(GlTextureTarget.Texture2d, Texture);
Gl.TexCoord2f(0, 0);
Gl.Vertex2f(-1, -1);
Gl.TexCoord2f(1, 0);
Gl.Vertex2f(1, -1);
Gl.TexCoord2f(1, 1);
Gl.Vertex2f(1, 1);
Gl.TexCoord2f(0, 1);
Gl.Vertex2f(-1, 1);
Gl.End();
}
public void Start(IRenderContext ctx)
{
Gl = (IOpenGLContext)ctx;
Gl.Frame += Render;
uint[] textures = new uint[1];
Gl.GenTextures(1, textures);
Texture = textures[0];
Gl.ActiveTexture(GlTextureUnit.Texture0);
Gl.BindTexture(GlTextureTarget.Texture2d, Texture);
byte[] pixels =
{
255, 0, 0, 255,
255, 255, 0, 255,
0, 0, 255, 255,
0, 255, 255, 255
};
Gl.TexParameteri(GlTextureTarget.Texture2d, GlTextureParameterName.TextureMagFilter, GL.LINEAR);
Gl.TexParameteri(GlTextureTarget.Texture2d, GlTextureParameterName.TextureMinFilter, GL.LINEAR);
Gl.TexParameteri(GlTextureTarget.Texture2d, GlTextureParameterName.TextureWrapS, GL.CLAMP_TO_EDGE);
Gl.TexParameteri(GlTextureTarget.Texture2d, GlTextureParameterName.TextureWrapT, GL.CLAMP_TO_EDGE);
Gl.TexImage2D(GlTextureTarget.Texture2d, 0, GlInternalFormat.Rgba, 2, 2, 0, GlPixelFormat.Rgba, GlPixelType.UnsignedByte, pixels);
Gl.GenerateMipmap(GlTextureTarget.Texture2d);
uint vertexShader = Gl.CreateShader(GlShaderType.VertexShader);
uint fragmentShader = Gl.CreateShader(GlShaderType.FragmentShader);
Gl.ShaderSource(vertexShader, 1, new [] { Encoding.ASCII.GetBytes(VertexShader) }, new [] { Encoding.ASCII.GetByteCount(VertexShader) });
Gl.CompileShader(vertexShader);
int[] result = new int[1];
Gl.GetShaderiv(vertexShader, GlShaderParameterName.CompileStatus, result);
if (((GlBoolean)result[0]) == GlBoolean.False)
{
int[] len = new int[1];
Gl.GetShaderiv(vertexShader, GlShaderParameterName.InfoLogLength, len);
byte[] log = new byte[len[0]];
Gl.GetShaderInfoLog(vertexShader, len[0], len, log);
Console.Error.WriteLine("Unable to compile vertex shader.");
Console.Error.Write(Encoding.ASCII.GetString(log));
}
Gl.ShaderSource(fragmentShader, 1, new [] { Encoding.ASCII.GetBytes(FragmentShader) }, new [] { Encoding.ASCII.GetByteCount(FragmentShader) });
Gl.CompileShader(fragmentShader);
Gl.GetShaderiv(fragmentShader, GlShaderParameterName.CompileStatus, result);
if (((GlBoolean)result[0]) == GlBoolean.False)
{
int[] len = new int[1];
Gl.GetShaderiv(fragmentShader, GlShaderParameterName.InfoLogLength, len);
byte[] log = new byte[len[0]];
Gl.GetShaderInfoLog(fragmentShader, len[0], len, log);
Console.Error.WriteLine("Unable to compile fragment shader.");
Console.Error.Write(Encoding.ASCII.GetString(log));
}
uint program = Gl.CreateProgram();
Gl.AttachShader(program, vertexShader);
Gl.AttachShader(program, fragmentShader);
Gl.LinkProgram(program);
Gl.GetProgramiv(fragmentShader, GlProgramPropertyARB.LinkStatus, result);
if (((GlBoolean)result[0]) == GlBoolean.False)
{
int[] len = new int[1];
Gl.GetProgramiv(program, GlProgramPropertyARB.InfoLogLength, len);
byte[] log = new byte[len[0]];
Gl.GetProgramInfoLog(program, len[0], len, log);
Console.Error.WriteLine("Unable to link program.");
Console.Error.WriteLine(Encoding.ASCII.GetString(log));
}
Gl.DetachShader(program, vertexShader);
Gl.DetachShader(program, fragmentShader);
Gl.DeleteShader(vertexShader);
Gl.DeleteShader(fragmentShader);
Gl.UseProgram(program);
int loc = Gl.GetUniformLocation(program, Encoding.ASCII.GetBytes("tex\0"));
Gl.Uniform1i(loc, 0);
}