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[Impeller] Generate descriptor set layout bindings in generated C++ headers. (flutter/engine#34779)

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magicianA 2022-07-22 02:37:04 +08:00 committed by GitHub
parent 59b2b68853
commit 1867ab94c4
2 changed files with 54 additions and 0 deletions
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28
engine/src/flutter/impeller/compiler/code_gen_template.h
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@ -147,6 +147,34 @@ std::move({{ arg.argument_name }}){% if not loop.is_last %}, {% endif %}
{% endfor %}
// ===========================================================================
// Metadata for Vulkan =======================================================
// ===========================================================================
#ifdef IMPELLER_ENABLE_VULKAN_REFLECTION
{% if length(buffers)+length(sampled_images) > 0 %}
static constexpr std::array<VkDescriptorSetLayoutBinding,{{length(buffers)+length(sampled_images)}}> kDescriptorSetLayouts{
{% for buffer in buffers %}
VkDescriptorSetLayoutBinding{
{{buffer.binding}}, // binding = {{buffer.binding}}
VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER, // descriptorType = Uniform Buffer
1, // descriptorCount = 1
{{to_vk_shader_stage_flag_bits(shader_stage)}}, // stageFlags = {{to_shader_stage(shader_stage)}}
nullptr, // pImmutableSamplers = NULL
},
{% endfor %}
{% for sampled_image in sampled_images %}
VkDescriptorSetLayoutBinding{
{{sampled_image.binding}}, // binding = {{sampled_image.binding}}
VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE, // descriptorType = Sampled Image
1, // descriptorCount = 1
{{to_vk_shader_stage_flag_bits(shader_stage)}},// stageFlags = {{to_shader_stage(shader_stage)}}
nullptr, // pImmutableSamplers = NULL
},
{% endfor %}
};
{% endif %}
#endif
}; // struct {{camel_case(shader_name)}}{{camel_case(shader_stage)}}Shader
} // namespace impeller

26
engine/src/flutter/impeller/compiler/reflector.cc
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@ -108,6 +108,28 @@ static std::string StringToShaderStage(std::string str) {
return "ShaderStage::kUnknown";
}
static std::string StringToVkShaderStage(std::string str) {
if (str == "vertex") {
return "VK_SHADER_STAGE_VERTEX_BIT";
}
if (str == "fragment") {
return "VK_SHADER_STAGE_FRAGMENT_BIT";
}
if (str == "tessellation_control") {
return "VK_SHADER_STAGE_TESSELLATION_CONTROL_BIT";
}
if (str == "tessellation_evaluation") {
return "VK_SHADER_STAGE_TESSELLATION_EVALUATION_BIT";
}
if (str == "compute") {
return "VK_SHADER_STAGE_COMPUTE_BIT";
}
return "VK_SHADER_STAGE_ALL_GRAPHICS";
}
Reflector::Reflector(Options options,
std::shared_ptr<const spirv_cross::ParsedIR> ir,
std::shared_ptr<fml::Mapping> shader_data,
@ -367,6 +389,10 @@ std::shared_ptr<fml::Mapping> Reflector::InflateTemplate(
[type = compiler_.GetType()](inja::Arguments& args) {
return ToString(type);
});
env.add_callback(
"to_vk_shader_stage_flag_bits", 1u, [](inja::Arguments& args) {
return StringToVkShaderStage(args.at(0u)->get<std::string>());
});
auto inflated_template =
std::make_shared<std::string>(env.render(tmpl, *template_arguments_));