From de7514e6b9ff9c0b9320975ba7d44754b5115b54 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Sat, 14 Feb 2026 15:23:14 +0100
Subject: refactor(wgsl): replace inline fullscreen_vs with common include

Replace duplicate fullscreen triangle vertex shader code with
#include "render/fullscreen_vs" in 8 workspace shaders. Eliminates
~60 lines of duplication and establishes single source of truth.

Modified shaders:
- circle_mask_compute.wgsl (main/test)
- circle_mask_render.wgsl (main/test)
- ellipse.wgsl (main/test)
- gaussian_blur.wgsl (main/test)

Updated test_shader_assets.cc to validate include directive instead
of inline @vertex keyword for affected shaders.

All tests passing (34/34).

handoff(Claude): Shader modularization - fullscreen_vs consolidated

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
---
 workspaces/test/shaders/circle_mask_compute.wgsl | 12 ++----------
 workspaces/test/shaders/circle_mask_render.wgsl  | 11 +----------
 workspaces/test/shaders/ellipse.wgsl             | 10 +---------
 workspaces/test/shaders/gaussian_blur.wgsl       | 11 ++---------
 4 files changed, 6 insertions(+), 38 deletions(-)

(limited to 'workspaces/test')

diff --git a/workspaces/test/shaders/circle_mask_compute.wgsl b/workspaces/test/shaders/circle_mask_compute.wgsl
index 484d3dd..b167781 100644
--- a/workspaces/test/shaders/circle_mask_compute.wgsl
+++ b/workspaces/test/shaders/circle_mask_compute.wgsl
@@ -2,6 +2,8 @@
 // Generates a circular mask (1.0 inside, 0.0 outside)
 
 #include "common_uniforms"
+#include "render/fullscreen_vs"
+
 struct CircleMaskParams {
   radius: f32,
   _pad0: f32,
@@ -12,16 +14,6 @@ struct CircleMaskParams {
 @group(0) @binding(0) var<uniform> uniforms: CommonUniforms;
 @group(0) @binding(1) var<uniform> params: CircleMaskParams;
 
-struct VSOutput {
-  @builtin(position) position: vec4<f32>,
-};
-
-@vertex fn vs_main(@builtin(vertex_index) i: u32) -> VSOutput {
-  var pos = array<vec2<f32>, 3>(
-    vec2<f32>(-1, -1), vec2<f32>(3, -1), vec2<f32>(-1, 3));
-  return VSOutput(vec4<f32>(pos[i], 0.0, 1.0));
-}
-
 @fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
   let uv = p.xy / uniforms.resolution;
   let center = vec2<f32>(0.5, 0.5);
diff --git a/workspaces/test/shaders/circle_mask_render.wgsl b/workspaces/test/shaders/circle_mask_render.wgsl
index cfa002e..55620c1 100644
--- a/workspaces/test/shaders/circle_mask_render.wgsl
+++ b/workspaces/test/shaders/circle_mask_render.wgsl
@@ -5,19 +5,10 @@
 @group(0) @binding(1) var mask_sampler: sampler;
 
 #include "common_uniforms"
+#include "render/fullscreen_vs"
 
 @group(0) @binding(2) var<uniform> uniforms: CommonUniforms;
 
-struct VSOutput {
-  @builtin(position) position: vec4<f32>,
-};
-
-@vertex fn vs_main(@builtin(vertex_index) i: u32) -> VSOutput {
-  var pos = array<vec2<f32>, 3>(
-    vec2<f32>(-1, -1), vec2<f32>(3, -1), vec2<f32>(-1, 3));
-  return VSOutput(vec4<f32>(pos[i], 0.0, 1.0));
-}
-
 @fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
   let uv = p.xy / uniforms.resolution;
   let mask_value = textureSample(mask_tex, mask_sampler, uv).r;
diff --git a/workspaces/test/shaders/ellipse.wgsl b/workspaces/test/shaders/ellipse.wgsl
index 69b2712..07f0c9a 100644
--- a/workspaces/test/shaders/ellipse.wgsl
+++ b/workspaces/test/shaders/ellipse.wgsl
@@ -1,16 +1,8 @@
 #include "common_uniforms"
+#include "render/fullscreen_vs"
 
 @group(0) @binding(0) var<uniform> uniforms: CommonUniforms;
 
-@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
-    var pos = array<vec2<f32>, 3>(
-        vec2<f32>(-1.0, -1.0),
-        vec2<f32>(3.0, -1.0),
-        vec2<f32>(-1.0, 3.0)
-    );
-    return vec4<f32>(pos[i], 0.0, 1.0);
-}
-
 fn sdEllipse(p: vec2<f32>, ab: vec2<f32>) -> f32 {
     var p_abs = abs(p);
     if (p_abs.x > p_abs.y) {
diff --git a/workspaces/test/shaders/gaussian_blur.wgsl b/workspaces/test/shaders/gaussian_blur.wgsl
index 02156f7..22e467f 100644
--- a/workspaces/test/shaders/gaussian_blur.wgsl
+++ b/workspaces/test/shaders/gaussian_blur.wgsl
@@ -2,6 +2,8 @@
 @group(0) @binding(1) var txt: texture_2d<f32>;
 
 #include "common_uniforms"
+#include "render/fullscreen_vs"
+
 struct GaussianBlurParams {
     strength: f32,
     _pad: f32,
@@ -10,15 +12,6 @@ struct GaussianBlurParams {
 @group(0) @binding(2) var<uniform> uniforms: CommonUniforms;
 @group(0) @binding(3) var<uniform> params: GaussianBlurParams;
 
-@vertex fn vs_main(@builtin(vertex_index) i: u32) -> @builtin(position) vec4<f32> {
-    var pos = array<vec2<f32>, 3>(
-        vec2<f32>(-1, -1),
-        vec2<f32>(3, -1),
-        vec2<f32>(-1, 3)
-    );
-    return vec4<f32>(pos[i], 0.0, 1.0);
-}
-
 @fragment fn fs_main(@builtin(position) p: vec4<f32>) -> @location(0) vec4<f32> {
     let uv = p.xy / uniforms.resolution;
     var res = vec4<f32>(0.0);
-- 
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