Blender Git Commits

Merge commit 'master@{4-weeks-ago}' into tmp-vulkan

Merge commit 'master@{5-weeks-ago}' into tmp-vulkan

Merge commit 'master@{6-weeks-ago}' into tmp-vulkan

Merge commit 'master@{7-weeks-ago}' into tmp-vulkan

Merge commit 'master@{8-weeks-ago}' into tmp-vulkan

Merge commit 'master@{9-weeks-ago}' into tmp-vulkan

Merge commit 'master@{10-weeks-ago}' into tmp-vulkan

Merge commit 'master@{11-weeks-ago}' into tmp-vulkan

Merge commit 'master@{12-weeks-ago}' into tmp-vulkan

Merge commit 'master@{3-months-ago}' into tmp-vulkan

Initial SpirV log parsing.

Still work in progress.

Moved shader compilation flag to cmake.

Migration of the shaders can take a long time. During this time it
you won't be able to start most GPU tests or Blender. This switch
will enable the compilation of the shader to other developments
can still happen.

`WITH_VULKAN_SHADER_COMPILATION` Default is OFF. Enable when migrating
shaders.

Vulkan: Patched gl_VertexID to gl_VertexIndex.

ShaderCompiler: Use CPP strings to improve API.

Vulkan: Compile Shader Modules.

Shaders are expected to fail as they need to be converted to Vulkan. Dy default the compilation is turned off. Enable VULKAN_SHADER_COMPILATION to activate shader module compilation.

ShaderCompiler: Split code per target type.

No functional changes.

Added Vulkan test cases.

Added counterparts of the shader test cases for vulkan.
Fixing an issue where the OpenGL context was created when using a vulkan
backend.

Add test case to compile builtin shaders.

When using the vulkan backend it crashes. Will look into this later this
week.

Cleanup: Added license headers.

Added shader compiler abstration.

The shader_compiler is an abstration layer for in case we need to switch
between other shader compilers in the future.

The shader compiler uses a CPP Api as it will only be accessed from GPU
module.

```
const char *source = "#version 450nvoid main() {}";
shader_compiler::Compiler *compiler = shader_compiler::Compiler::create_default();
shader_compiler::Job job;
job.source = source;
job.name = __func__;
job.source_type = shader_compiler::SourceType::GlslComputeShader;
job.compilation_target = shader_compiler::TargetType::SpirV;

shader_compiler::Result *result = compiler->compile(job);
EXPECT_EQ(result->type, shader_compiler::TargetType::SpirV);
EXPECT_EQ(result->status_code, shader_compiler::StatusCode::Ok);
EXPECT_GT(result->bin.size(), 0);
EXPECT_EQ(result->error_log, "");
delete result;
delete compiler;
```

The CMakeFiles need some attention as it currently works when linking to
the shaderlib_combined. On linux it picks up the shaderlib from the
vulkan SDK, eventually it needs to pick up from our prebuild libraries.