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There are two usage types of buffer CPU accesses:
One where we try to use the buffer contents for multiple draw commands in
a batch. (batch := sequence of commands that are flushed together),
like incrementally adding bitmaps to a bitmap texture that is reallocated
on flush.
And one where we assume we can safely overwrite the old buffer contexts, like
glTexSubImage. In this case we need to make sure all old drawing commands
referencing the buffer are flushed before we map the buffer.
This is easily forgotten.
Add wrappers for the most common of these operations. The first type is
prefixed with "st_no_flush" and the second type is prefixed with
"st_cond_flush", where "cond" indicates that we attmpt to only flush
if there is indeed unflushed draw commands referencing the buffer.
Prefixed functions are
screen::get_tex_transfer
pipe_buffer_write
pipe_buffer_read
pipe_buffer_map
Please use the wrappers whenever possible.
Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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Also implement context member functions to optimize away those
flushes whenever possible.
Signed-off-by: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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We can determine if the texture is compressed by checking the format.
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Instead, a new pipe_transfer object has to be created and mapped for
transferring data between the CPU and a texture. This gives the driver more
flexibility for textures in address spaces that aren't CPU accessible.
This is a first pass; softpipe/xlib builds and runs glxgears, but it only shows
a black window. Looks like something's off related to the Z buffer, so the
depth test always fails.
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Conflicts:
src/mesa/state_tracker/st_atom_sampler.c
src/mesa/state_tracker/st_cb_texture.c
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For many envirionments it's necessary to allocate display targets
in a window-system friendly manner. Add facilities so that a driver
can tell if a texture is likely to be used to generate a display surface
and if use special allocation paths if necessary.
Hook up softpipe to call into the winsys->surface_alloc_storage()
routine in this case, though we probably want to change that interface
slightly also.
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Fixes problems with interleaved glTexImage and rendering calls.
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This provides better information about which images in texture object have changed.
Also, call texture_update() from more places previously missed.
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Calling glTexSubImage() or glTexImage() to replace texture data didn't
reliably cause pipe->set_sampler_texture() to get called so drivers didn't
always get notified of new texture data.
The st_texture_object->pt pointer doesn't always indicate changed data so
added a dirtyData field.
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Remove pipe_texture->first_level (always implicitly zero). This means there's
never any unused mipmap levels at the top.
In the state tracker, we no longer re-layout mipmapped textures if the
MinLod/MaxLod texture parameters change. It's up to the driver to obey the
pipe_sampler->min/max_lod clamps.
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Also make enum pipe_format used in a couple more places.
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It's state tracker specific / not really necessary anyway.
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Directly use struct pipe_buffer_handle for storage and struct pipe_surface for
(un)mapping.
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pipe->get_tex_surface() has to be used for access to texture image data.
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