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nir: Add r600 specific CUBE opcode to evaluate cube texture coords and

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face

The opcode evaluates tha unnormalized coordinates, the length of the
major axis, and the cube face.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Acked-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9200>
This commit is contained in:
Gert Wollny
2020-12-23 16:19:31 +01:00
parent 4f4e1e5ed9
commit e5db9c3dd4
1 changed files with 34 additions and 0 deletions
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34
src/compiler/nir/nir_opcodes.py
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@@ -1167,6 +1167,40 @@ dst = ((((src0 & 0xffff0000) >> 16) * (src1 & 0x0000ffff)) << 16) + src2;
triop("imad24_ir3", tint32, _2src_commutative,
"(((int32_t)src0 << 8) >> 8) * (((int32_t)src1 << 8) >> 8) + src2")
# r600-specific instruction that evaluates unnormalized cube texture coordinates
# and face index
# The actual texture coordinates are evaluated from this according to
# dst.yx / abs(dst.z) + 1.5
unop_horiz("cube_r600", 4, tfloat32, 3, tfloat32, """
dst.x = dst.y = dst.z = 0.0;
float absX = fabsf(src0.x);
float absY = fabsf(src0.y);
float absZ = fabsf(src0.z);
if (absX >= absY && absX >= absZ) { dst.z = 2 * src0.x; }
if (absY >= absX && absY >= absZ) { dst.z = 2 * src0.y; }
if (absZ >= absX && absZ >= absY) { dst.z = 2 * src0.z; }
if (src0.x >= 0 && absX >= absY && absX >= absZ) {
dst.y = -src0.z; dst.x = -src0.y; dst.w = 0;
}
if (src0.x < 0 && absX >= absY && absX >= absZ) {
dst.y = src0.z; dst.x = -src0.y; dst.w = 1;
}
if (src0.y >= 0 && absY >= absX && absY >= absZ) {
dst.y = src0.x; dst.x = src0.z; dst.w = 2;
}
if (src0.y < 0 && absY >= absX && absY >= absZ) {
dst.y = src0.x; dst.x = -src0.z; dst.w = 3;
}
if (src0.z >= 0 && absZ >= absX && absZ >= absY) {
dst.y = src0.x; dst.x = -src0.y; dst.w = 4;
}
if (src0.z < 0 && absZ >= absX && absZ >= absY) {
dst.y = -src0.x; dst.x = -src0.y; dst.w = 5;
}
""")
# 24b multiply into 32b result (with sign extension)
binop("imul24", tint32, _2src_commutative + associative,
"(((int32_t)src0 << 8) >> 8) * (((int32_t)src1 << 8) >> 8)")