GPUShaderCreateInfo for interface abstraction

This is a first part of the Shader Create Info system could be.

A shader create info provides a way to define shader structure, resources
and interfaces. This makes for a quick way to provide backend agnostic
binding informations while also making shader variations easy to declare.

- Clear source input (only one file). Cleans up the GPU api since we can create a
  shader from one descriptor
- Resources and interfaces are generated by the backend (much simpler than parsing).
- Bindings are explicit from position in the array.
- GPUShaderInterface becomes a trivial translation of enums and string copy.
- No external dependency to third party lib.
- Cleaner code, less fragmentation of resources in several libs.
- Easy to modify / extend at runtime.
- no parser involve, very easy to code.
- Does not hold any data, can be static and kept on disc.
- Could hold precompiled bytecode for static shaders.

This also includes a new global dependency system.
GLSL shaders can include other sources by using #pragma BLENDER_REQUIRE(...).

This patch already migrated several builtin shaders. Other shaders should be migrated
one at a time, and could be done inside master.

There is a new compile directive `WITH_GPU_SHADER_BUILDER` this is an optional
directive for linting shaders to increase turn around time.

What is remaining:
- pyGPU API {T94975}
- Migration of other shaders. This could be a community effort.

Reviewed By: jbakker

Maniphest Tasks: T94975

Differential Revision: https://developer.blender.org/D13360

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/gpu/GPU_shader.h b/source/blender/gpu/GPU_shader.h
index f36c8f99064..97b9b26ba2a 100644
--- a/source/blender/gpu/GPU_shader.h
+++ b/source/blender/gpu/GPU_shader.h
@@ -30,6 +30,8 @@ extern "C" {
 struct GPUIndexBuf;
 struct GPUVertBuf;
 
+/** Opaque type hiding #blender::gpu::shader::ShaderCreateInfo */
+typedef struct GPUShaderCreateInfo GPUShaderCreateInfo;
 /** Opaque type hiding #blender::gpu::Shader */
 typedef struct GPUShader GPUShader;
 
@@ -66,6 +68,7 @@ GPUShader *GPU_shader_create_ex(const char *vertcode,
                                 const char **tf_names,
                                 int tf_count,
                                 const char *shname);
+GPUShader *GPU_shader_create_from_info(const GPUShaderCreateInfo *_info);
 
 struct GPU_ShaderCreateFromArray_Params {
   const char **vert, **geom, **frag, **defs;