mirror of
https://github.com/encounter/dawn-cmake.git
synced 2025-07-06 21:25:58 +00:00
4d3af66bbd
In order to preserve padding properly for MSL, we need to use its packed_vec type for all vec3 types in storage buffers, not just struct members. This commit includes a complete rewrite of the PackedVec3 transform to achieve this. The key details are: * An internal `__packed_vec3<>` type was added, which corresponds to a `type::Vector` with an additional flag to indicate that it will be emitted as packed vector. * The `PackedVec3` transform replaces all vec3 types used in host-shareable address spaces with the internal `__packed_vec3` type. This includes vec3 types that appear as the store type of a pointer. * When used as an array element, these `__packed_vec3` types are wrapped in a struct that contains a single `__packed_vec3` member. This allows us to add an `@align()` attribute that ensures that `array<vec3<T>>` still has the correct array element stride. * When the `vec3<T>` appears as a struct member in the input program, we apply the `@align()` to that member to ensure that we do not change its offset. * Matrix types with three rows that are used in memory are replaced with an array of columns, where each column uses a `__packed_vec3` inside an aligned wrapper structure as above. * Accesses to host-shareable memory that involve any of these types invoke a "pack" or "unpack" helper function to convert them to the equivalent type that uses `__packed_vec3` or a regular `vec3` as required. * The `chromium_internal_relaxed_uniform_layout` extension is used to avoid issues where modifying a type in the uniform address space triggers stricter layout validation rules. Bug: tint:1571 Fixed: tint:1837 Change-Id: Idaf2da2f5bcb2be00c85ec657edfb614186476bb Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/121200 Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: James Price <jrprice@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
38 lines
1.1 KiB
Plaintext
38 lines
1.1 KiB
Plaintext
#include <metal_stdlib>
|
|
|
|
using namespace metal;
|
|
struct tint_symbol_2 {
|
|
float2 vUV [[user(locn0)]];
|
|
};
|
|
|
|
struct tint_symbol_3 {
|
|
float4 value [[color(0)]];
|
|
};
|
|
|
|
float4 tint_symbol_inner(float2 vUV, texture2d<float, access::sample> tint_symbol_4, sampler tint_symbol_5) {
|
|
float3 const random = tint_symbol_4.sample(tint_symbol_5, vUV).rgb;
|
|
int i = 0;
|
|
while (true) {
|
|
if ((i < 1)) {
|
|
} else {
|
|
break;
|
|
}
|
|
float3 const offset = float3(random[0]);
|
|
if (((((offset[0] < 0.0f) || (offset[1] < 0.0f)) || (offset[0] > 1.0f)) || (offset[1] > 1.0f))) {
|
|
i = as_type<int>((as_type<uint>(i) + as_type<uint>(1)));
|
|
continue;
|
|
}
|
|
float const sampleDepth = 0.0f;
|
|
i = as_type<int>((as_type<uint>(i) + as_type<uint>(1)));
|
|
}
|
|
return float4(1.0f);
|
|
}
|
|
|
|
fragment tint_symbol_3 tint_symbol(texture2d<float, access::sample> tint_symbol_6 [[texture(0)]], sampler tint_symbol_7 [[sampler(0)]], tint_symbol_2 tint_symbol_1 [[stage_in]]) {
|
|
float4 const inner_result = tint_symbol_inner(tint_symbol_1.vUV, tint_symbol_6, tint_symbol_7);
|
|
tint_symbol_3 wrapper_result = {};
|
|
wrapper_result.value = inner_result;
|
|
return wrapper_result;
|
|
}
|
|
|