i965 turns fddx/fddy into their coarse/fine variants based on the
ctx->Hint.FragmentShaderDerivative setting. It needs to know whether
this can impact a shader in order to better guess NOS settings.
---
src/compiler/nir/nir_gather_info.c | 16 ++++++++++++++++
src/compiler/shader_info.h | 7 +++++++
2 files changed, 23 insertions(+)
diff --git a/src/compiler/nir/nir_gather_info.c
b/src/compiler/nir/nir_gather_info.c
index 7ae3ecc4425..13cdae39eca 100644
--- a/src/compiler/nir/nir_gather_info.c
+++ b/src/compiler/nir/nir_gather_info.c
@@ -280,11 +280,27 @@ gather_tex_info(nir_tex_instr *instr, nir_shader *shader)
}
}
+static void
+gather_alu_info(nir_alu_instr *instr, nir_shader *shader)
+{
+ switch (instr->op) {
+ case nir_op_fddx:
+ case nir_op_fddy:
+ shader->info.uses_fddx_fddy = true;
+ break;
+ default:
+ break;
+ }
+}
+
static void
gather_info_block(nir_block *block, nir_shader *shader)
{
nir_foreach_instr(instr, block) {
switch (instr->type) {
+ case nir_instr_type_alu:
+ gather_alu_info(nir_instr_as_alu(instr), shader);
+ break;
case nir_instr_type_intrinsic:
gather_intrinsic_info(nir_instr_as_intrinsic(instr), shader);
break;
diff --git a/src/compiler/shader_info.h b/src/compiler/shader_info.h
index cd044d86094..5f14ad19df7 100644
--- a/src/compiler/shader_info.h
+++ b/src/compiler/shader_info.h
@@ -73,6 +73,13 @@ typedef struct shader_info {
/** Bitfield of which textures are used by texelFetch() */
uint32_t textures_used_by_txf;
+ /**
+ * True if this shader uses the fddx/fddy opcodes.
+ *
+ * Note that this does not include the "fine" and "coarse" variants.
+ */
+ bool uses_fddx_fddy;
+
/* The size of the gl_ClipDistance[] array, if declared. */
unsigned clip_distance_array_size;
--
2.14.2
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