From a272461d85cf7a14bb764bd463489ffc8f1b933e Mon Sep 17 00:00:00 2001
From: "re.kovalev" <re.kovalev@gmail.com>
Date: Tue, 31 Oct 2023 21:51:45 +0300
Subject: [PATCH] =?UTF-8?q?=D0=A8=D0=B5=D0=B9=D0=B4=D0=B5=D1=80=D1=8B=20?=
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---
 shaders/empty.frag      |  6 ++++++
 shaders/sun_shadow.geom | 22 ++++++++++++++++++++++
 shaders/sun_shadow.vert |  9 +--------
 3 files changed, 29 insertions(+), 8 deletions(-)
 create mode 100644 shaders/empty.frag
 create mode 100644 shaders/sun_shadow.geom

diff --git a/shaders/empty.frag b/shaders/empty.frag
new file mode 100644
index 0000000..0f8d755
--- /dev/null
+++ b/shaders/empty.frag
@@ -0,0 +1,6 @@
+#version 330 core
+
+void main()
+{
+    
+}
\ No newline at end of file
diff --git a/shaders/sun_shadow.geom b/shaders/sun_shadow.geom
new file mode 100644
index 0000000..4912b94
--- /dev/null
+++ b/shaders/sun_shadow.geom
@@ -0,0 +1,22 @@
+#version 420 core
+
+layout(triangles, invocations = 4) in; // здесь invocations должно соответствовать количеству каскадов
+layout(triangle_strip, max_vertices = 3) out;
+
+layout(std140, binding = 3) uniform Sun
+{
+    vec3 direction;
+    vec3 color;
+    mat4 vp[4];
+} sun;
+
+void main()
+{ 
+	for (int i = 0; i < 3; ++i)
+	{
+		gl_Position = sun.vp[gl_InvocationID] * gl_in[i].gl_Position;
+		gl_Layer = gl_InvocationID;
+		EmitVertex();
+	}
+	EndPrimitive();
+}  
\ No newline at end of file
diff --git a/shaders/sun_shadow.vert b/shaders/sun_shadow.vert
index 05306dc..cbe3f11 100644
--- a/shaders/sun_shadow.vert
+++ b/shaders/sun_shadow.vert
@@ -4,14 +4,7 @@ layout (location = 0) in vec3 pos;
 
 uniform mat4 model;
 
-layout(std140, binding = 3) uniform Sun
-{
-    vec3 direction;
-    vec3 color;
-    mat4 vp;
-} sun;
-
 void main()
 {
-    gl_Position = sun.vp * model * vec4(pos, 1.0);
+    gl_Position = model * vec4(pos, 1.0);
 }