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maxwell_to_vk: Approach GL_CLAMP closer to the GL spec 

The OpenGL spec defines GL_CLAMP's formula similarly to CLAMP_TO_EDGE
and CLAMP_TO_BORDER depending on the filter mode used. It doesn't
exactly behave like this, but it's the closest we can get with what
Vulkan offers without emulating it by injecting shader code.
This commit is contained in:
ReinUsesLisp 2019-12-13 02:38:34 -03:00
parent f845df8651
commit 15513f0801
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GPG Key ID: 2DFC508897B39CFE
3 changed files with 17 additions and 9 deletions
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14
src/video_core/renderer_vulkan/maxwell_to_vk.cpp
View File

@ -44,7 +44,8 @@ vk::SamplerMipmapMode MipmapMode(Tegra::Texture::TextureMipmapFilter mipmap_filt
return {};
}
vk::SamplerAddressMode WrapMode(Tegra::Texture::WrapMode wrap_mode) {
vk::SamplerAddressMode WrapMode(Tegra::Texture::WrapMode wrap_mode,
Tegra::Texture::TextureFilter filter) {
switch (wrap_mode) {
case Tegra::Texture::WrapMode::Wrap:
return vk::SamplerAddressMode::eRepeat;
@ -55,10 +56,15 @@ vk::SamplerAddressMode WrapMode(Tegra::Texture::WrapMode wrap_mode) {
case Tegra::Texture::WrapMode::Border:
return vk::SamplerAddressMode::eClampToBorder;
case Tegra::Texture::WrapMode::Clamp:
// TODO(Rodrigo): GL_CLAMP was removed as of OpenGL 3.1, to implement GL_CLAMP, we can use
// eClampToBorder to get the border color of the texture, and then sample the edge to
// manually mix them. However the shader part of this is not yet implemented.
// TODO(Rodrigo): Emulate GL_CLAMP properly
switch (filter) {
case Tegra::Texture::TextureFilter::Nearest:
return vk::SamplerAddressMode::eClampToEdge;
case Tegra::Texture::TextureFilter::Linear:
return vk::SamplerAddressMode::eClampToBorder;
}
UNREACHABLE();
return vk::SamplerAddressMode::eClampToEdge;
case Tegra::Texture::WrapMode::MirrorOnceClampToEdge:
return vk::SamplerAddressMode::eMirrorClampToEdge;
case Tegra::Texture::WrapMode::MirrorOnceBorder:

3
src/video_core/renderer_vulkan/maxwell_to_vk.h
View File

@ -23,7 +23,8 @@ vk::Filter Filter(Tegra::Texture::TextureFilter filter);
vk::SamplerMipmapMode MipmapMode(Tegra::Texture::TextureMipmapFilter mipmap_filter);
vk::SamplerAddressMode WrapMode(Tegra::Texture::WrapMode wrap_mode);
vk::SamplerAddressMode WrapMode(Tegra::Texture::WrapMode wrap_mode,
Tegra::Texture::TextureFilter filter);
vk::CompareOp DepthCompareFunction(Tegra::Texture::DepthCompareFunc depth_compare_func);

7
src/video_core/renderer_vulkan/vk_sampler_cache.cpp
View File

@ -46,9 +46,10 @@ UniqueSampler VKSamplerCache::CreateSampler(const Tegra::Texture::TSCEntry& tsc)
{}, MaxwellToVK::Sampler::Filter(tsc.mag_filter),
MaxwellToVK::Sampler::Filter(tsc.min_filter),
MaxwellToVK::Sampler::MipmapMode(tsc.mipmap_filter),
MaxwellToVK::Sampler::WrapMode(tsc.wrap_u), MaxwellToVK::Sampler::WrapMode(tsc.wrap_v),
MaxwellToVK::Sampler::WrapMode(tsc.wrap_p), tsc.GetLodBias(), has_anisotropy,
max_anisotropy, tsc.depth_compare_enabled,
MaxwellToVK::Sampler::WrapMode(tsc.wrap_u, tsc.mag_filter),
MaxwellToVK::Sampler::WrapMode(tsc.wrap_v, tsc.mag_filter),
MaxwellToVK::Sampler::WrapMode(tsc.wrap_p, tsc.mag_filter), tsc.GetLodBias(),
has_anisotropy, max_anisotropy, tsc.depth_compare_enabled,
MaxwellToVK::Sampler::DepthCompareFunction(tsc.depth_compare_func), tsc.GetMinLod(),
tsc.GetMaxLod(), vk_border_color.value_or(vk::BorderColor::eFloatTransparentBlack),
unnormalized_coords);