WebGL unsigned long issue

[n9]

Some WebGL code needs casting int/uint casting, for instance:

gl.TexParameteri(WebGLRenderingContext.TEXTURE_2D, WebGLRenderingContext.TEXTURE_WRAP_S, WebGLRenderingContext.CLAMP_TO_EDGE);

Since WebGLRenderingContext contains method with the last parameter of type int:

// IDL: void texParameteri(GLenum target, GLenum pname, GLint param); 
public void TexParameteri(uint target, uint pname, int param);

and uint constant:

// IDL: const GLenum CLAMP_TO_EDGE                  = 0x812F;
public const uint CLAMP_TO_EDGE = 33071;

The problem is caused because GLenum is defined in IDL as:

typedef unsigned long  GLenum;

There are more cases of casting problem in the spec, e.g. Uniform1i vs. TEXTURE_2D.

One possible workaround is to define alternative methods, such as:

public void TexParameteri(uint target, uint pname, uint param) { }
public void Uniform1i(WebGLUniformLocation location, uint x) { }

However similar problem is with:

GLint getAttribLocation(WebGLProgram? program, DOMString name)

vs.

void enableVertexAttribArray(GLuint index)

from WebGL specification.

I think that the spec considers unsigned long as non-negative integer implicitly convertible to common integer long.

So, the solution from my point of view is to translate IDL's unsigned long to C#'s int.

[erik-kallen]

I made this change in 88f5351

[n9]

Looks ok, thx.