As I understand it, Alpha Testing will simply ignore those pixels, that do not pass the test.

I have made an alpha-test with renderstates [D3DRS_ALPHAFUNC, D3DCMP_GREATER] and [D3DRS_ALPHAREF, 128].

Since the problem arose, I have simplified my texture, making the rgb-layer completely white, while preserving the alpha-layer.

I have further simplified my shader, so that it now simply outputs the texture raw, and that is all. No lighting or any other kinds of calculations.

The result is still scorched edges, as can be seen below:

I would have expected a completely white plant, with no grey-scales (partial alpha) and no black edges.

How come, that the alpha is burned into the texture like that?

As can be seen, the pixel shader is extremely simple (I removed the argument list because it is irrelevant (except a_texcoord0)).

float4 PS_light_SHADOW(...) : COLOR
{
    return tex2D(g_texturemap_sampler, a_texcoord0);
}

My renderstates are as follows:

SetRenderState(D3DRS_ZENABLE, D3DZB_TRUE)
SetRenderState(D3DRS_ZWRITEENABLE, TRUE)
SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE)
SetRenderState(D3DRS_ALPHATESTENABLE, TRUE)
SetRenderState(D3DRS_ALPHAFUNC, D3DCMP_GREATER)
SetRenderState(D3DRS_ALPHAREF, 128)

Thank you in advance.

Btw, I whited out the entire rgb layer - completely, meaning across borders - of the texture in the opening post. That should ensure, that the colors around the borders were the same.

I tried to alter the texture filtering in the shader to Point, with this result:


As can be seen, this does not solve my problem. The result is just pixelated.

This is how the sampler looks in the shader:

sampler2D g_texturemap_sampler =
sampler_state
{
	Texture = <g_texturemap>;
	MinFilter = Point;
	MagFilter = Point;
	MipFilter = Point;
};

I also tried to plug my texture into an ATI-demo called "Alpha to Coverage", replacing it with one of the other textures. The demo also draws AlphaTesting, which I set it to in the screenshot.

This is how it looks in the ATI demo:

There is no flaws, so I believe that this is not a texture problem - at least not at the file level.

Maybe in my creation?

D3DXCreateTextureFromFileExW(   m_device,
                                "../database/texture/foliage/gniff.tga", // gniff.tga is just a testname - it is the right one
                                D3DX_FROM_FILE,			// width
                                D3DX_FROM_FILE,			// height
                                D3DX_DEFAULT,			// miplevels
                                0,				// usage
                                D3DFMT_A8R8G8B8,		// format
                                D3DPOOL_MANAGED,		// pool
                                D3DX_DEFAULT,			// filter
                                D3DX_DEFAULT,			// mipfilter
                                0,				// colorkey
                                NULL,				// srcinfo
                                NULL,				// palette
                                a_textureDX))			// texture

If it is not any of these, could it then be a renderstate, that Im unaware of? Is there any renderstate, that can cause this?

Thank you for your help guys.