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, 20 insertions, 9 deletions

diff --git a/source/blender/editors/gpencil/drawgpencil.c b/source/blender/editors/gpencil/drawgpencil.c
index 6f63529298c..23b579b94f1 100644
--- a/source/blender/editors/gpencil/drawgpencil.c
+++ b/source/blender/editors/gpencil/drawgpencil.c
@@ -61,9 +61,12 @@
 
 #include "WM_api.h"
 
+#include "GPU_batch.h"
 #include "GPU_immediate.h"
 #include "GPU_matrix.h"
+#include "GPU_shader_shared.h"
 #include "GPU_state.h"
+#include "GPU_uniform_buffer.h"
 
 #include "ED_gpencil.h"
 #include "ED_screen.h"
@@ -189,21 +192,27 @@ static void gpencil_draw_stroke_3d(tGPDdraw *tgpw,
   };
 
   immBindBuiltinProgram(GPU_SHADER_GPENCIL_STROKE);
-  immUniform2fv("Viewport", viewport);
-  immUniform1f("pixsize", tgpw->rv3d->pixsize);
+
   float obj_scale = tgpw->ob ?
                         (tgpw->ob->scale[0] + tgpw->ob->scale[1] + tgpw->ob->scale[2]) / 3.0f :
                         1.0f;
 
-  immUniform1f("objscale", obj_scale);
+  struct GPencilStrokeData gpencil_stroke_data;
+  copy_v2_v2(gpencil_stroke_data.viewport, viewport);
+  gpencil_stroke_data.pixsize = tgpw->rv3d->pixsize;
+  gpencil_stroke_data.objscale = obj_scale;
   int keep_size = (int)((tgpw->gpd) && (tgpw->gpd->flag & GP_DATA_STROKE_KEEPTHICKNESS));
-  immUniform1i("keep_size", keep_size);
-  immUniform1f("pixfactor", tgpw->gpd->pixfactor);
+  gpencil_stroke_data.keep_size = keep_size;
+  gpencil_stroke_data.pixfactor = tgpw->gpd->pixfactor;
   /* xray mode always to 3D space to avoid wrong zdepth calculation (T60051) */
-  immUniform1i("xraymode", GP_XRAY_3DSPACE);
-  immUniform1i("caps_start", (int)tgpw->gps->caps[0]);
-  immUniform1i("caps_end", (int)tgpw->gps->caps[1]);
-  immUniform1i("fill_stroke", (int)tgpw->is_fill_stroke);
+  gpencil_stroke_data.xraymode = GP_XRAY_3DSPACE;
+  gpencil_stroke_data.caps_start = tgpw->gps->caps[0];
+  gpencil_stroke_data.caps_end = tgpw->gps->caps[1];
+  gpencil_stroke_data.fill_stroke = tgpw->is_fill_stroke;
+
+  GPUUniformBuf *ubo = GPU_uniformbuf_create_ex(
+      sizeof(struct GPencilStrokeData), &gpencil_stroke_data, __func__);
+  immBindUniformBuf("gpencil_stroke_data", ubo);
 
   /* draw stroke curve */
   immBeginAtMost(GPU_PRIM_LINE_STRIP_ADJ, totpoints + cyclic_add + 2);
@@ -255,6 +264,8 @@ static void gpencil_draw_stroke_3d(tGPDdraw *tgpw,
 
   immEnd();
   immUnbindProgram();
+
+  GPU_uniformbuf_free(ubo);
 }
 
 /* ----- Strokes Drawing ------ */