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vc4: Translate 4-byte index buffers to 2 bytes.

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Fixes assertion failures in 14 piglit tests (half of which now pass).
This commit is contained in:
Eric Anholt
2014-10-18 12:50:05 +01:00
parent 572fba95e4
commit 6212d2402d
4 changed files with 92 additions and 10 deletions
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46
src/gallium/drivers/vc4/vc4_resource.c
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@@ -512,6 +512,52 @@ vc4_update_shadow_baselevel_texture(struct pipe_context *pctx,
shadow->writes = orig->writes;
}
/**
* Converts a 4-byte index buffer to 2 bytes.
*
* Since GLES2 only has support for 1 and 2-byte indices, the hardware doesn't
* include 4-byte index support, and we have to shrink it down.
*
* There's no fallback support for when indices end up being larger than 2^16,
* though it will at least assertion fail. Also, if the original index data
* was in user memory, it would be nice to not have uploaded it to a VBO
* before translating.
*/
void
vc4_update_shadow_index_buffer(struct pipe_context *pctx,
const struct pipe_index_buffer *ib)
{
struct vc4_resource *shadow = vc4_resource(ib->buffer);
struct vc4_resource *orig = vc4_resource(shadow->shadow_parent);
uint32_t count = shadow->base.b.width0 / 2;
if (shadow->writes == orig->writes)
return;
struct pipe_transfer *src_transfer;
uint32_t *src = pipe_buffer_map_range(pctx, &orig->base.b,
ib->offset,
count * 4,
PIPE_TRANSFER_READ, &src_transfer);
struct pipe_transfer *dst_transfer;
uint16_t *dst = pipe_buffer_map_range(pctx, &shadow->base.b,
0,
count * 2,
PIPE_TRANSFER_WRITE, &dst_transfer);
for (int i = 0; i < count; i++) {
uint32_t src_index = src[i];
assert(src_index <= 0xffff);
dst[i] = src_index;
}
pctx->transfer_unmap(pctx, dst_transfer);
pctx->transfer_unmap(pctx, src_transfer);
shadow->writes = orig->writes;
}
void
vc4_resource_screen_init(struct pipe_screen *pscreen)
{