Currently the ddraw capabilities were almost static, except of D3D
support. When overlay support is added, the caps depend on certain
settings in WineD3D or capabilities available from OpenGL and Xv. So
set those caps in wined3d as well.
Fixed function processing can only deal with values between 0 and 1
generally. Clamp the results of instructions that could produce bigger
or smaller values.
It's probably rare for higher render targets to get locked or updated
from sysmem, but this should still be more correct. It also makes the
code simpler.
This is an ATI specific format designed for compressed normal maps,
and quite a few games check for its existence. While it is an
ATI-specific "extension" in d3d9, it is a core part of
D3D10(DXGI_FORMAT_BC5), and supported on Geforce 8 cards.
This happened to work because most cards have the same amount of
pshader and vshader constants, but for some reason this doesn't hold
true on this macbook pro here, which lead to a crash due to heap
corruption
Some drivers(the open source ones most notably) cannot satisfy all
possible D3D formats. This doesn't mean we should fall back to the
emergency fallback instantly. Instead, try to loosen the requirements
step by step.
This is cleaner than the if statements in the code. Also np2 textures
should in theory support linear filtering, but fglrx doesn't seem to
like it. This needs further investigation. So far we've never used
linear filtering on np2 textures, so there should not be a
regression. Furthermore I think shader support is more important than
filtering, since NP2 textures are mostly used for 1:1 copying to the
screen.
ATI cards prior to the radeon HD series did not have unconditional non
power of two support. So far we've used texture_rectangle for that, or
created a bigger power of two texture with padding. This had the
disadvantage that we had to correct the coordinates, which causes
extreme problems with shaders(doesn't work, pretty much).
Both the MacOS and the fglrx driver have support for
GL_ARB_texture_non_power_of_two, and run it on the hardware as long as
we stay within the texture_rectangle limitations. This allows us to
have conditional non power of two textures with normalized
coordinates. This patch adds an internal extension, and the code
creates a regular GL_TEXTURE_2D texture with NP2 size, but refuses
mipmapping, filtering and texture_rectangle incompatible
operations. This makes np2 textures work with shaders on fglrx and
macos.
The opengl extension mentioned in that code was never finished, and as
far as I know there is no way to make use of tangent data in the d3d
fixed function pipeline as well.
Stefan Dösinger