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gl_shader_decompiler: Enable GL_EXT_texture_shadow_lod if available 

Enable GL_EXT_texture_shadow_lod if available. If this extension is not available, such as on Intel/AMD proprietary drivers, use textureGrad as a workaround.
This commit is contained in:
Morph 2020-06-20 07:43:04 -04:00
parent 1e65da971b
commit f77c897b8d
1 changed files with 43 additions and 7 deletions
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50
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -37,6 +37,7 @@ using Tegra::Shader::IpaMode;
using Tegra::Shader::IpaSampleMode;
using Tegra::Shader::PixelImap;
using Tegra::Shader::Register;
using Tegra::Shader::TextureType;
using VideoCommon::Shader::BuildTransformFeedback;
using VideoCommon::Shader::Registry;
@ -526,6 +527,9 @@ private:
if (device.HasImageLoadFormatted()) {
code.AddLine("#extension GL_EXT_shader_image_load_formatted : require");
}
if (device.HasTextureShadowLod()) {
code.AddLine("#extension GL_EXT_texture_shadow_lod : require");
}
if (device.HasWarpIntrinsics()) {
code.AddLine("#extension GL_NV_gpu_shader5 : require");
code.AddLine("#extension GL_NV_shader_thread_group : require");
@ -909,13 +913,13 @@ private:
return "samplerBuffer";
}
switch (sampler.type) {
case Tegra::Shader::TextureType::Texture1D:
case TextureType::Texture1D:
return "sampler1D";
case Tegra::Shader::TextureType::Texture2D:
case TextureType::Texture2D:
return "sampler2D";
case Tegra::Shader::TextureType::Texture3D:
case TextureType::Texture3D:
return "sampler3D";
case Tegra::Shader::TextureType::TextureCube:
case TextureType::TextureCube:
return "samplerCube";
default:
UNREACHABLE();
@ -1380,8 +1384,19 @@ private:
const std::size_t count = operation.GetOperandsCount();
const bool has_array = meta->sampler.is_array;
const bool has_shadow = meta->sampler.is_shadow;
const bool workaround_lod_array_shadow_as_grad =
!device.HasTextureShadowLod() && function_suffix == "Lod" && meta->sampler.is_shadow &&
((meta->sampler.type == TextureType::Texture2D && meta->sampler.is_array) ||
meta->sampler.type == TextureType::TextureCube);
std::string expr = "texture";
if (workaround_lod_array_shadow_as_grad) {
expr += "Grad";
} else {
expr += function_suffix;
}
std::string expr = "texture" + function_suffix;
if (!meta->aoffi.empty()) {
expr += "Offset";
} else if (!meta->ptp.empty()) {
@ -1415,6 +1430,16 @@ private:
expr += ')';
}
if (workaround_lod_array_shadow_as_grad) {
switch (meta->sampler.type) {
case TextureType::Texture2D:
return expr + ", vec2(0.0), vec2(0.0))";
case TextureType::TextureCube:
return expr + ", vec3(0.0), vec3(0.0))";
}
UNREACHABLE();
}
for (const auto& variant : extras) {
if (const auto argument = std::get_if<TextureArgument>(&variant)) {
expr += GenerateTextureArgument(*argument);
@ -2041,8 +2066,19 @@ private:
const auto meta = std::get_if<MetaTexture>(&operation.GetMeta());
ASSERT(meta);
std::string expr = GenerateTexture(
operation, "Lod", {TextureArgument{Type::Float, meta->lod}, TextureOffset{}});
std::string expr{};
if (!device.HasTextureShadowLod() && meta->sampler.is_shadow &&
((meta->sampler.type == TextureType::Texture2D && meta->sampler.is_array) ||
meta->sampler.type == TextureType::TextureCube)) {
LOG_ERROR(Render_OpenGL,
"Device lacks GL_EXT_texture_shadow_lod, using textureGrad as a workaround");
expr = GenerateTexture(operation, "Lod", {});
} else {
expr = GenerateTexture(operation, "Lod",
{TextureArgument{Type::Float, meta->lod}, TextureOffset{}});
}
if (meta->sampler.is_shadow) {
expr = "vec4(" + expr + ')';
}