[Render] Window not transparent in Power Stone 1

[BenoitAdam]

Windows doesn't appear transparent in this level

Should be :

NullDC4Wii (on dolphin)

Need to test on real hardware to be 100% sure

[BenoitAdam]

Modulate alpha infos :

Texture/Shading Instruction

This determines he method for combining the Shading Color values (Base Colors alpha, and
Offset Colors) interpolated between vertices with texture alpha values and texture color values.
However, this settings is invalid for Non Textured polygons. 

| Setting |  Mode       |  Explanation                      | PIX(A)                         |
|  0      |  Decal      | PIX(RGB) = TEX(RGB) + OFFSET(RGB) | PIX(A) = TEX(A)                |
|  1      | Modulate    | The texture color value is multiplied by the Shading Color value. The texture alpha value is substituted for the Shading alpha value. PIX(RGB) = COL(RGB) * TEX(RGB) + OFFSET(RGB) | PIX(A) = TEX(A) |
|  2      | Decal Alpha | The texture color value is blended with the Shading Color value according to the texture a value. PIX(RGB) = (TEX(RGB)* TEX(A)) + COL(RGB) * (1- TEX(A) ) + OFFSET(RGB) | PIX(A) = COL(A) |
|  3      | Modulate Alpha | The texture color value is multiplied by the Shading Color value. The texture a value is multiplied by the Shading a value. PIX(RGB) = COL(RGB) * TEX (RGB) + OFFSET(RGB) | PIX(A) = COL(A) * TEX(A) |