private void DrawDirect()
{
CheckErrors();
GL.MatrixMode(MatrixMode.Projection);
CheckErrors();
GL.LoadIdentity();
CheckErrors();
GL.Ortho(0, 1200, 0, 800, -1, 1);
CheckErrors();
GL.MatrixMode(MatrixMode.Modelview);
CheckErrors();
GL.LoadIdentity();
CheckErrors();
GL.UseProgram(shaderProgram);
CheckErrors();
_quad[0] = new GLVertex(new Vector2(500, 200), _bottomLeft, SKColors.Blue);
_quad[1] = new GLVertex(new Vector2(900, 200), _bottomRight, SKColors.Blue);
_quad[2] = new GLVertex(new Vector2(900, 500), _topRight, SKColors.Blue);
_quad[3] = new GLVertex(new Vector2(500, 500), _topLeft, SKColors.Blue);
GL.BindTexture(TextureTarget.Texture2D, textureIdDirect);
CheckErrors();
GL.BufferData(BufferTarget.ArrayBuffer, (IntPtr)(GLVertex.Size * _quad.Length),
_quad, BufferUsageHint.StreamDraw);
CheckErrors();
GL.VertexPointer(2, VertexPointerType.Float, GLVertex.Size, 0);
CheckErrors();
GL.TexCoordPointer(2, TexCoordPointerType.Float, GLVertex.Size, Vector2.SizeInBytes);
CheckErrors();
GL.ColorPointer(4, ColorPointerType.Float, GLVertex.Size, Vector2.SizeInBytes * 2);
CheckErrors();
GL.BufferData(BufferTarget.ElementArrayBuffer, (IntPtr)(sizeof(short) * _quadIndices.Length),
_quadIndices, BufferUsageHint.StreamDraw);
CheckErrors();
GL.DrawElements(PrimitiveType.Triangles, 6, DrawElementsType.UnsignedShort, IntPtr.Zero);
CheckErrors();
GL.UseProgram(0);
CheckErrors();
}
public GLTriangle(GLVertex v1, GLVertex v2, GLVertex v3)
{
fVertex1 = v1;
fVertex2 = v2;
fVertex3 = v3;
}
public GLTriangle(float3 v1, float3 v2, float3 v3, ColorRGBA aColor)
{
fVertex1 = new GLVertex(v1, aColor);
fVertex2 = new GLVertex(v1, aColor);
fVertex3 = new GLVertex(v1, aColor);
}