From 8fb2ff458ba579dba08bfdf57d043ad158b5db07 Mon Sep 17 00:00:00 2001
From: Jeroen Bakker <jbakker>
Date: Mon, 17 Jan 2022 14:32:03 +0100
Subject: 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
---
 source/blender/draw/engines/workbench/shaders/workbench_image_lib.glsl | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'source/blender/draw/engines/workbench/shaders/workbench_image_lib.glsl')

diff --git a/source/blender/draw/engines/workbench/shaders/workbench_image_lib.glsl b/source/blender/draw/engines/workbench/shaders/workbench_image_lib.glsl
index 57d648d3565..49e3f57ab2e 100644
--- a/source/blender/draw/engines/workbench/shaders/workbench_image_lib.glsl
+++ b/source/blender/draw/engines/workbench/shaders/workbench_image_lib.glsl
@@ -25,12 +25,14 @@ bool node_tex_tile_lookup(inout vec3 co, sampler2DArray ima, sampler1DArray map)
   return true;
 }
 
+#ifndef WORKBENCH_SHADER_SHARED_H
 uniform sampler2DArray imageTileArray;
 uniform sampler1DArray imageTileData;
 uniform sampler2D imageTexture;
 
 uniform float imageTransparencyCutoff = 0.1;
 uniform bool imagePremult;
+#endif
 
 vec3 workbench_image_color(vec2 uvs)
 {
-- 
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