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
---
 .../gpu/shaders/gpu_shader_gpencil_stroke_vert.glsl        | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

(limited to 'source/blender/gpu/shaders/gpu_shader_gpencil_stroke_vert.glsl')

diff --git a/source/blender/gpu/shaders/gpu_shader_gpencil_stroke_vert.glsl b/source/blender/gpu/shaders/gpu_shader_gpencil_stroke_vert.glsl
index 07b4ae52110..16e12b2989e 100644
--- a/source/blender/gpu/shaders/gpu_shader_gpencil_stroke_vert.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_gpencil_stroke_vert.glsl
@@ -1,3 +1,4 @@
+#ifndef USE_GPU_SHADER_CREATE_INFO
 uniform mat4 ModelViewProjectionMatrix;
 uniform mat4 ProjectionMatrix;
 
@@ -12,22 +13,21 @@ in float thickness;
 
 out vec4 finalColor;
 out float finalThickness;
+#endif
 
-#define TRUE 1
-
-float defaultpixsize = pixsize * (1000.0 / pixfactor);
+float defaultpixsize = gpencil_stroke_data.pixsize * (1000.0 / gpencil_stroke_data.pixfactor);
 
 void main(void)
 {
   gl_Position = ModelViewProjectionMatrix * vec4(pos, 1.0);
-  finalColor = color;
+  geometry_in.finalColor = color;
 
-  if (keep_size == TRUE) {
-    finalThickness = thickness;
+  if (gpencil_stroke_data.keep_size) {
+    geometry_in.finalThickness = thickness;
   }
   else {
     float size = (ProjectionMatrix[3][3] == 0.0) ? (thickness / (gl_Position.z * defaultpixsize)) :
                                                    (thickness / defaultpixsize);
-    finalThickness = max(size * objscale, 1.0);
+    geometry_in.finalThickness = max(size * gpencil_stroke_data.objscale, 1.0);
   }
 }
-- 
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