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etnaviv: Implement 128-bit format emulation using dual 64-bit layout

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The Vivante GPUs don't natively support 128-bit formats like
R32G32B32A32_FLOAT. This patch implements emulation by calculating
the memory layout as if these were 64-bit formats, but doubling the
allocation size to store both halves of the 128-bit data.

For 128-bit formats, we:
- Calculate stride and layer_stride using the 64-bit equivalent format
- Double the mip level size to accommodate both 64-bit halves
- Use translate_format_128bit_to_64bit() to map formats like
  R32G32B32A32_FLOAT -> R32G32_FLOAT

This creates a memory layout where each mip level contains the 128-bit
data organized as two consecutive 64-bit portions.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37597>
This commit is contained in:
Christian Gmeiner 2025-07-15 12:21:00 +02:00 • committed by Marge Bot
parent 7483723966
commit 9dd9ebe9c5
1 changed files with 6 additions and 2 deletions
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8
src/gallium/drivers/etnaviv/etnaviv_resource.c
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@ -309,6 +309,7 @@ setup_miptree(struct etna_resource *rsc, unsigned paddingX, unsigned paddingY,
unsigned msaa_xscale, unsigned msaa_yscale)
{
struct pipe_resource *prsc = &rsc->base;
enum pipe_format fmt = translate_format_128bit_to_64bit(prsc->format);
unsigned level, size = 0;
unsigned width = prsc->width0;
unsigned height = prsc->height0;
@ -322,11 +323,14 @@ setup_miptree(struct etna_resource *rsc, unsigned paddingX, unsigned paddingY,
mip->depth = depth;
mip->padded_width = align(width * msaa_xscale, paddingX);
mip->padded_height = align(height * msaa_yscale, paddingY);
mip->stride = util_format_get_stride(prsc->format, mip->padded_width);
mip->stride = util_format_get_stride(fmt, mip->padded_width);
mip->offset = size;
mip->layer_stride = mip->stride * util_format_get_nblocksy(prsc->format, mip->padded_height);
mip->layer_stride = mip->stride * util_format_get_nblocksy(fmt, mip->padded_height);
mip->size = prsc->array_size * mip->layer_stride;
if (format_is_128bit(prsc->format))
mip->size *= 2;
/* align levels to 64 bytes to be able to render to them */
size += align(mip->size, ETNA_PE_ALIGNMENT) * depth;