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nouveau/codegen: Add capability to pre-specify tessellation domain

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In the case of SPIRV tessellation shaders, the execution mode can be
specified in the tessellation control shader. So we need a way to know the domain
when compiling the tessellation evaluation shader.

Acked-by: M Henning <drawoc@darkrefraction.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24327>
This commit is contained in:
George Ouzounoudis 2022-10-24 20:02:02 +03:00 • committed by Marge Bot
parent df5d1ef2b5
commit cdece16cf4
2 changed files with 18 additions and 1 deletions
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3
src/nouveau/codegen/nv50_ir_driver.h
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@ -103,6 +103,9 @@ struct nv50_ir_prog_info
uint32_t gridInfoBase; /* base address for NTID,NCTAID */
uint16_t numThreads[3]; /* max number of threads */
} cp;
struct {
uint8_t prespecified_domain; /* MESA_PRIM_{QUADS,TRIANGLES,LINES}, POINTS if unspecified */
} tese;
} prop;
struct {

16
src/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
View file

@ -2916,6 +2916,18 @@ NVC0LoweringPass::handleLDST(Instruction *i)
void
NVC0LoweringPass::readTessCoord(LValue *dst, int c)
{
// GLSL requires domain qualifier to be defined in TES while SPIRV allows
// domain to be defined in TES and/or TCS
uint8_t domain = prog->driver_out->prop.tp.domain;
const bool tese_defined_domain =
domain == MESA_PRIM_LINES ||
domain == MESA_PRIM_TRIANGLES ||
domain == MESA_PRIM_QUADS;
if (!tese_defined_domain) {
domain = prog->driver->prop.tese.prespecified_domain;
}
Value *laneid = bld.getSSA();
Value *x, *y;
@ -2930,7 +2942,8 @@ NVC0LoweringPass::readTessCoord(LValue *dst, int c)
y = dst;
} else {
assert(c == 2);
if (prog->driver_out->prop.tp.domain != MESA_PRIM_TRIANGLES) {
if (domain != MESA_PRIM_TRIANGLES) {
// optimize out tesscoord.z
bld.mkMov(dst, bld.loadImm(NULL, 0));
return;
}
@ -2943,6 +2956,7 @@ NVC0LoweringPass::readTessCoord(LValue *dst, int c)
bld.mkFetch(y, TYPE_F32, FILE_SHADER_OUTPUT, 0x2f4, NULL, laneid);
if (c == 2) {
// compute tesscoord.z from x, y
bld.mkOp2(OP_ADD, TYPE_F32, dst, x, y);
bld.mkOp2(OP_SUB, TYPE_F32, dst, bld.loadImm(NULL, 1.0f), dst);
}