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-rw-r--r--src/gallium/drivers/panfrost/include/panfrost-job.h16
-rw-r--r--src/gallium/drivers/panfrost/pandecode/decode.c17
2 files changed, 31 insertions, 2 deletions
diff --git a/src/gallium/drivers/panfrost/include/panfrost-job.h b/src/gallium/drivers/panfrost/include/panfrost-job.h
index fb4a12fe156..48b3a65a0b8 100644
--- a/src/gallium/drivers/panfrost/include/panfrost-job.h
+++ b/src/gallium/drivers/panfrost/include/panfrost-job.h
@@ -442,7 +442,21 @@ struct bifrost_blend_rt {
/* This is likely an analogue of the flags on
* midgard_blend_rt */
- u32 unk1; // = 0x200
+ u16 flags; // = 0x200
+
+ /* Single-channel blend constants are encoded in a sort of
+ * fixed-point. Basically, the float is mapped to a byte, becoming
+ * a high byte, and then the lower-byte is added for precision.
+ * For the original float f:
+ *
+ * f = (constant_hi / 255) + (constant_lo / 65535)
+ *
+ * constant_hi = int(f / 255)
+ * constant_lo = 65535*f - (65535/255) * constant_hi
+ */
+
+ u16 constant;
+
struct mali_blend_equation equation;
/*
* - 0x19 normally
diff --git a/src/gallium/drivers/panfrost/pandecode/decode.c b/src/gallium/drivers/panfrost/pandecode/decode.c
index e70ebb7f660..fa91094d1f0 100644
--- a/src/gallium/drivers/panfrost/pandecode/decode.c
+++ b/src/gallium/drivers/panfrost/pandecode/decode.c
@@ -878,6 +878,17 @@ pandecode_replay_blend_equation(const struct mali_blend_equation *blend)
pandecode_log("},\n");
}
+/* Decodes a Bifrost blend constant. See the notes in bifrost_blend_rt */
+
+static unsigned
+decode_bifrost_constant(u16 constant)
+{
+ float lo = (float) (constant & 0xFF);
+ float hi = (float) (constant >> 8);
+
+ return (hi / 255.0) + (lo / 65535.0);
+}
+
static mali_ptr
pandecode_bifrost_blend(void *descs, int job_no, int rt_no)
{
@@ -887,7 +898,10 @@ pandecode_bifrost_blend(void *descs, int job_no, int rt_no)
pandecode_log("struct bifrost_blend_rt blend_rt_%d_%d = {\n", job_no, rt_no);
pandecode_indent++;
- pandecode_prop("unk1 = 0x%" PRIx32, b->unk1);
+ pandecode_prop("flags = 0x%" PRIx16, b->flags);
+ pandecode_prop("constant = 0x%" PRIx8 " /* %f */",
+ b->constant, decode_bifrost_constant(b->constant));
+
/* TODO figure out blend shader enable bit */
pandecode_replay_blend_equation(&b->equation);
pandecode_prop("unk2 = 0x%" PRIx16, b->unk2);
@@ -910,6 +924,7 @@ pandecode_midgard_blend(union midgard_blend *blend, bool is_shader)
pandecode_replay_shader_address("shader", blend->shader);
} else {
pandecode_replay_blend_equation(&blend->equation);
+ pandecode_prop("constant = %f", blend->constant);
}
pandecode_indent--;