diff options
Diffstat (limited to 'third_party/rust/naga/src/back/glsl/features.rs')
| -rw-r--r-- | third_party/rust/naga/src/back/glsl/features.rs | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/third_party/rust/naga/src/back/glsl/features.rs b/third_party/rust/naga/src/back/glsl/features.rs index e7de05f695..99c128c6d9 100644 --- a/third_party/rust/naga/src/back/glsl/features.rs +++ b/third_party/rust/naga/src/back/glsl/features.rs @@ -1,8 +1,8 @@ use super::{BackendResult, Error, Version, Writer}; use crate::{ back::glsl::{Options, WriterFlags}, - AddressSpace, Binding, Expression, Handle, ImageClass, ImageDimension, Interpolation, Sampling, - Scalar, ScalarKind, ShaderStage, StorageFormat, Type, TypeInner, + AddressSpace, Binding, Expression, Handle, ImageClass, ImageDimension, Interpolation, + SampleLevel, Sampling, Scalar, ScalarKind, ShaderStage, StorageFormat, Type, TypeInner, }; use std::fmt::Write; @@ -48,6 +48,8 @@ bitflags::bitflags! { /// /// We can always support this, either through the language or a polyfill const INSTANCE_INDEX = 1 << 22; + /// Sample specific LODs of cube / array shadow textures + const TEXTURE_SHADOW_LOD = 1 << 23; } } @@ -125,6 +127,7 @@ impl FeaturesManager { check_feature!(TEXTURE_SAMPLES, 150); check_feature!(TEXTURE_LEVELS, 130); check_feature!(IMAGE_SIZE, 430, 310); + check_feature!(TEXTURE_SHADOW_LOD, 200, 300); // Return an error if there are missing features if missing.is_empty() { @@ -251,6 +254,11 @@ impl FeaturesManager { } } + if self.0.contains(Features::TEXTURE_SHADOW_LOD) { + // https://registry.khronos.org/OpenGL/extensions/EXT/EXT_texture_shadow_lod.txt + writeln!(out, "#extension GL_EXT_texture_shadow_lod : require")?; + } + Ok(()) } } @@ -469,6 +477,47 @@ impl<'a, W> Writer<'a, W> { } } } + Expression::ImageSample { image, level, offset, .. } => { + if let TypeInner::Image { + dim, + arrayed, + class: ImageClass::Depth { .. }, + } = *info[image].ty.inner_with(&module.types) { + let lod = matches!(level, SampleLevel::Zero | SampleLevel::Exact(_)); + let bias = matches!(level, SampleLevel::Bias(_)); + let auto = matches!(level, SampleLevel::Auto); + let cube = dim == ImageDimension::Cube; + let array2d = dim == ImageDimension::D2 && arrayed; + let gles = self.options.version.is_es(); + + // We have a workaround of using `textureGrad` instead of `textureLod` if the LOD is zero, + // so we don't *need* this extension for those cases. + // But if we're explicitly allowed to use the extension (`WriterFlags::TEXTURE_SHADOW_LOD`), + // we always use it instead of the workaround. + let grad_workaround_applicable = (array2d || (cube && !arrayed)) && level == SampleLevel::Zero; + let prefer_grad_workaround = grad_workaround_applicable && !self.options.writer_flags.contains(WriterFlags::TEXTURE_SHADOW_LOD); + + let mut ext_used = false; + + // float texture(sampler2DArrayShadow sampler, vec4 P [, float bias]) + // float texture(samplerCubeArrayShadow sampler, vec4 P, float compare [, float bias]) + ext_used |= (array2d || cube && arrayed) && bias; + + // The non `bias` version of this was standardized in GL 4.3, but never in GLES. + // float textureOffset(sampler2DArrayShadow sampler, vec4 P, ivec2 offset [, float bias]) + ext_used |= array2d && (bias || (gles && auto)) && offset.is_some(); + + // float textureLod(sampler2DArrayShadow sampler, vec4 P, float lod) + // float textureLodOffset(sampler2DArrayShadow sampler, vec4 P, float lod, ivec2 offset) + // float textureLod(samplerCubeShadow sampler, vec4 P, float lod) + // float textureLod(samplerCubeArrayShadow sampler, vec4 P, float compare, float lod) + ext_used |= (cube || array2d) && lod && !prefer_grad_workaround; + + if ext_used { + features.request(Features::TEXTURE_SHADOW_LOD); + } + } + } _ => {} } } |