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shader: specialize cube image descriptors (#134)

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* shader: specialize cube image descriptors

Track whether image descriptors refer to cube maps during resource specialization, and apply the coordinate offset conversion when sampling cube maps as 2D image arrays in SPIR-V emission.

* shader: fix cube array coordinate lowering

---------

Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Nikos
2026-07-31 03:59:10 +02:00
committed by GitHub
co-authored by nmzik
parent d475387171
commit 3b75a5659a
5 changed files with 155 additions and 56 deletions
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tests/ResourceTrackingTests.cpp
+28
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@@ -1217,6 +1217,34 @@ void TestResourceSpecializationIsTypedAndTransactional() {
Decoder::ImageDimension::Dim2DArray,
"array MIMG intent did not produce a 2D-array view");
Program cube_view;
cube_view.stage = ShaderType::Compute;
cube_view.blocks.resize(1);
cube_view.blocks[0].instructions = {
ImageUse(0x24, Opcode::ImageLoad, ResourceKind::Image,
Decoder::ImageDimension::Dim2DArray)};
Prepare(cube_view);
auto cube_snapshot = array_2d_snapshot;
cube_snapshot.images[0].dwords[3] =
Prospero::GpuEnumValue(Prospero::ImageType::kCube) << 28u;
Check(SpecializeResources(cube_view, cube_snapshot, &error) &&
ValidateResourceSpecialization(cube_view, cube_snapshot, &error) &&
cube_view.info.images[0].cube &&
cube_view.blocks[0].instructions[0].memory.image_cube,
"cube descriptor identity did not reach the specialized image and IR");
auto array_after_cube = cube_snapshot;
array_after_cube.images[0].dwords[3] =
Prospero::GpuEnumValue(Prospero::ImageType::kColor2DArray) << 28u;
Check(!ValidateResourceSpecialization(cube_view, array_after_cube, &error),
"2D-array descriptor reused a cube-coordinate specialization");
auto null_after_cube = cube_snapshot;
null_after_cube.images[0].dwords.fill(0);
Check(SpecializeResources(cube_view, null_after_cube, &error) &&
ValidateResourceSpecialization(cube_view, null_after_cube, &error) &&
!cube_view.info.images[0].cube &&
!cube_view.blocks[0].instructions[0].memory.image_cube,
"canonical null respecialization retained stale cube-coordinate state");
Program program;
program.stage = ShaderType::Compute;
program.blocks.resize(1);