From 22ae3726e62adf3fe35aa600da489fb5f19c644a Mon Sep 17 00:00:00 2001
From: Sascha Willems <webmaster@saschawillems.de>
Date: Fri, 28 Mar 2025 17:43:10 +0100
Subject: [PATCH] Slang shaders for push constants sample

---
 .../pushconstants/pushconstants.frag.slang    | 16 ++++++++
 .../pushconstants/pushconstants.vert.slang    | 38 +++++++++++++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 shaders/slang/pushconstants/pushconstants.frag.slang
 create mode 100644 shaders/slang/pushconstants/pushconstants.vert.slang

diff --git a/shaders/slang/pushconstants/pushconstants.frag.slang b/shaders/slang/pushconstants/pushconstants.frag.slang
new file mode 100644
index 00000000..a2646791
--- /dev/null
+++ b/shaders/slang/pushconstants/pushconstants.frag.slang
@@ -0,0 +1,16 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSOutput
+{
+    float3 Color;
+};
+
+[shader("fragment")]
+float4 main(VSOutput input) : SV_TARGET
+{
+	return float4(input.Color, 1.0);
+}
\ No newline at end of file
diff --git a/shaders/slang/pushconstants/pushconstants.vert.slang b/shaders/slang/pushconstants/pushconstants.vert.slang
new file mode 100644
index 00000000..538ea288
--- /dev/null
+++ b/shaders/slang/pushconstants/pushconstants.vert.slang
@@ -0,0 +1,38 @@
+/* Copyright (c) 2025, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+struct VSInput
+{
+	float3 Pos : POSITION0;
+	float3 Normal : NORMAL0;
+	float3 Color : COLOR0;
+};
+
+struct UBO
+{
+	float4x4 projection;
+	float4x4 model;
+	float4x4 view;
+};
+ConstantBuffer<UBO> ubo;
+
+struct VSOutput
+{
+	float4 Pos : SV_POSITION;
+	float3 Color;
+};
+
+// Uniform entry-point parameters are automatically bound to push constants by slang
+[shader("vertex")]
+VSOutput main(VSInput input, uniform float4 pushColor, uniform float4 pushPosition)
+{
+    VSOutput output;
+    output.Color = input.Color * pushColor.rgb;
+    float3 locPos = float3(mul(ubo.model, float4(input.Pos.xyz, 1.0)).xyz);
+    float3 worldPos = locPos + pushPosition.xyz;
+	output.Pos = mul(ubo.projection, mul(ubo.view, float4(worldPos.xyz, 1.0)));
+	return output;
+}
\ No newline at end of file